huawei parameter

Handover Control Data Table

HO algorithm Range: Huawei handover algorithm Unit - Default: Huawei handover algorithm Recommended: Huawei handover algorithm Description: To select handover algorithm. Note: At present, only Huawei handover algorithm is available. Min interval for TCH HOs Range: 1~60 Unit Second Default: 2 Recommended: 2

Description:

When a new TCH is assigned, a timer should be started. Only when this timer times out will handover be allowed. This parameter is the duration for this timer. This parameter is used to avoid incorrect handover due to inaccurate MRs at the early stage of call establishment. The value of this parameter when MR is pre-processed by BTS should be smaller than that when MR is not pre-processed by BTS.

Min interval for SD HOs Range: 1~60 Unit second Default: 2 Recommended: 2

Description:

When a new SDCCH is assigned, a timer should be started. Only when this timer times out will handover be allowed. This parameter is the duration for this timer. This parameter is used to avoid incorrect handover due to inaccurate MRs at the early stage of call establishment. The value of this parameter when MR is pre-processed by BTS should be smaller than that when MR is not pre-processed by BTS.

Min interval for consecutive HOsRange: 1~60 Unit second Default: 4 Recommended: 6 Description: This parameter is used to prevent consecutive handovers that can result

in bad network performance. After BSC sends a handover command, it will start a timer. BSC will not perform any handover before this timer times out. This parameter is the duration for this timer.

Min interval for Emerg. HOs Range: 1~60 Unit second Default: 4 Recommended: 6

Description: When BSC completes or fails to perform an emergency handover, it will start a timer. BSC will not perform any emergency handover before this timer times out. This parameter is the duration for this timer.

Co-BSC/MSC Adj Range: Yes/ No Unit - Default: No Recommended: No

Description: Indicates whether to adjust a candidate cell sorting so as that handover in the same BSC/MSC is in priority.

SD HO allowed Range: Yes/ No Unit - Default: No Recommended: No Description: Determines whether to allow the handover between signaling channels. Penalty allowed Range: Yes/ No Unit - Default: Yes Recommended: Yes

Description: Indicates whether penalty is given to certain candidate cells, including the target cell that has handover failure history and the cell that has emergency handover history due to too large value of TA or bad quality.

Intra-cell HO allowed Range: Yes/ No

Unit - Default: No Recommended: No

Description:

Determines whether intra-cell handover is allowed. Intra-cell handover includes timeslot and TRX change. Intra-cell handover can reduce the impact of "Rayleigh" fading or interference.

When initiating an intra cell HO, select as priority the channels with different TRXs from the TRXs occupied before HO.

Note:

During the intra-cell handover, the channels on the TXR different from the previously occupied TRX are preferred to ensure the service quality.

For the version G3BSC32.10102.06.1120A and later, the TXR different from the the previously occupied TRX are preferred.

Load HO allowed Range: Yes/ No Unit - Default: Yes Recommended: Yes

Description:

Indicates whether Traffic load-sharing handover is allowed. Load-sharing can reduce the cell congestion and balance the traffic load for each cell so as to improve network performance. It works only in the same BSC or in cells of the same layer. It is used only for TCH.

Note: Extra interference might be resulted from tight frequency reuse. MS fast moving HO allowed Range: Yes/ No Unit - Default: No Recommended: No

Description: The fast moving algorithm is a special algorithm to process fast moving MS. This parameter is used to decide whether to use this algorithm.

Rx_Level_Drop HO allowed Range: Yes/ No Unit - Default: No Recommended: No Description: The parameter decides whether to use the emergency handover algorithm

when receiving level drops fast.

Generally, this parameter is set to No.

This algorithm requires that BTS send the original MR to BSC.

Note:

1. Normally, the BSC determines whether to initiate handovers according to the priorities of of HO types. But the treatment of the BSC for the Rx_Level_Drop HO is some special.

When the BSC determines whether to initiate the Rx_Level_Drop HO, there are two cases:

• When the MR pre-processing function is disabled, the BSC determines whether to initiate the Rx_Level_Drop HO according to the MR sent by the BTS.

• When the MR pre-processing function is enabled, the BTS determines whether to initiate the Rx_Level_Drop HO and send the judgment to the BSC in two bits. The BSC initiates the Rx_Level_Drop HO according to the judgment of the BTS and selects the proper candidate cell for the handover.

2. For abnormal cases: When the MR pre-processing function is enabled, the BTS does not send the judgment of whether to initiate the Rx_Level_Drop HO to the BSC. Therefore, the BSC determines whether to initiate the Rx_Level_Drop HO by itself. For the original MR is not sent to the BSC, the BSC does not determine whether to initiate the handover.

PBGT HO allowed Range: Yes/ No Unit - Default: Yes Recommended: Yes

Description:

Indicates whether to use the PBGT (POWER BUDGET) handover algorithm. PBGT is a handover algorithm based on path loss. It searches a cell in real time which can meet a certain requirements and has smaller path loss, and judge whether to hand over it or not. To avoid Ping-Pong handover, PBGT handover occurs only between cells of the same layer and triggered only in TCH channel. Proper use of PBGT can reduces the over-cell coverage and co-channel interference.

MS power prediction after HORange: Yes/ No Unit -

Default: No Recommended: No

Description:

Indicates whether MS is allowed to use optimized power instead of the maximum power to access new channel during handover. If this parameter is set to "Yes", this can reduce system interference and improve service quality.

MR. Pre-process Range: Yes/ No Unit - Default: No Recommended: No

Description:

Indicates whether BTS pre-processes MR. If this parameter is set to "No", it means that MR is processed by BSC. In this case, the parameter Transfer original MR. and Transfer BS/MS Power Class are invalid. If this parameter is set to "Yes", this will reduces the load of Abis interface signaling and also the load of BSC. It also improves response time and network performance. Meanwhile, this parameter determines the place where to perform power control. If this parameter is set to "Yes", then the power control will be performed by BTS. Otherwise, the power control will be performed by BSC.

Note:

1) MR Pre-process aims to reduce load of BSC MPU. For versions before BTS01.1130, MR Pre-process will be enabled unless busy hour traffic exceeds the theoretic value. For versions after BTS01.1130 (including BTS01.1130), MR Pre-process is advised to be enabled if no encryption is used, but not if otherwise.

2) For BTS22C, this parameter must be set as "No.".

3) BTS2X (including BTS23 and BTS22C) supports G-I power control instead of G-II power control shift-to BTS.

When setting this parameter, it should be noted that whether BTS supports power control.

4) In 16K mode, if some TRX configured 2 or more SDCCH, or enabled dynamic SDCCH, it is recommended to enable MR. Pre-process, and the frequency of report configured as 1 time per second.

Transfer original MR. Range: Yes/ No Unit - Default: No

Recommended: No

Description: Description: Indicates whether to transfer the original MR to BSC after BTS pre-processes MR. When the parameter is set to "Yes", BTS transfer to BSC not only the processed MRs, but also the original MRs.

Note: In the case of 15:1 function, if the number of SDCCH/8s should be greater than or equal to 2, this parameter should be set to "No".

Transfer BS/MS power class Range: Yes/ No Unit - Default: Yes Recommended: Yes

Description:

Indicates whether to transfer the original BS/MS power class to BSC. If the parameter is set to "No", BTS will not report BS/MS power class to BSC. This will affect the result of uplink and downlink balance measurement.

Note:

When MR Pre-process is enabled, the result of uplink and downlink balance measurement will be affected if "Transfer BS/MS power class" is set as "No". Besides, such power compensation handovers as PBGT handover, load handover and concentric handover are abnormal.

Cell Asynchronism HO Range: Yes/ No Unit - Default: No Recommended: No

Description:

The synchronous handover between synchronous cells in a BTS to which a fiber repeater is attached is easy to fail due to different TAs for the two cells. This parameter is specially set to control the handover type of synchronous cells.

If you select No, the type of handovers in and between synchronous cells is synchronous.

If you select Yes, the type of handovers in and between synchronous cells is asynchronous.

Sent Freq.of preprocessed MR.

Range: Do not report, Twice every second, Once every second, Once every 2 seconds, Once every 4 seconds.

Unit -

Default: Twice every second

Once a second (in a trunk networking mode of 15:1)

Recommended: Twice every second

Once a second (in a trunk networking mode of 15:1) Description: Indicates the period of BTS to transfer preprocessed MR to BSC.

Note: In the case of 15:1 function, it is recommended to set this parameter to "Once every second".

Multi-MNC HO allowed Range: Yes/ No Unit - Default: No

Recommended: For areas that have only one MNC, this parameter is suggested to be configured as No. For areas that have multiple MNCs, this parameter is suggested to be configured as Yes.

Description:

Controlling whether the multi-MNC handover decision is allowed. If "N" is selected, the multi-MNC handover decision will not be performed. The handover processing for the cell of the same MNC will be the same as that for the cell of a different MNC. If "Y" is selected, the multi-handover decision will be performed. The handover control will be performed according to the selected "Multi-MNC HO type".

For the situation where there are multiple MNCs, it is recommended to configure this parameter with "Yes"; otherwise, with "No".

Multi-MNC HO type

Range:

Normal handover, only the handover to a cell with the same MNC allowed, a cell with the same MNC first, a better cell with the same MNC first, a better cell with a different MNC first, a cell with a different MNC first, and only the handover to a cell with a different MNC allowed.

Unit - Default: Normal handover

Description:

When "Multi-MNC HO allowed" is set as "Y", you can determine the multi-MNC handover control strategy according to this parameter. Each multi-MNC handover control strategy and its application occasion are given below.

1. Normal handover

1) Control strategy: hand over to a cell providing better service quality

(in respect of level, quality, cell class, load and whether the serving cell shares BSC\MSC).

2) Application occasion: MS is expected to hand over to a cell providing better service quality without regard to whether the destination cell is of the same MNC.

2. Handover to a cell of the same MNC allowed

1) Control strategy: Only the handover to a cell (including the serving cell) of the same MNC is allowed.

2) Application occasion: MS is expected to hand over to a cell of the same MNC.

3. Handover to a cell of the same MNC first

1) Control strategy: If the neighboring cell and the serving cell are of the same MNC, and the receiving level of the neighboring cell is higher than its "Min-DL power on candidate cell", this neighboring cell will be given priority in handover.

2) Application occasion: When cells of the same MNC serve normally, MS is expected to hand over to a cell of the same MNC. Otherwise (i.e. MS can not detect signals in cells of the same MNC), MS can hand over to a cell of a different MNC.

4. Handover to a better cell of the same MNC first

1) Control strategy: If the neighboring cell and the serving cell are of the same MNC, and the receiving level of the neighboring cell is higher than its "Inter-layer HO threshold", this neighboring cell will be given priority in handover.

2) Application occasion: When cells of the same MNC serve normally, MS is expected to hand over to a cell of the same MNC. Otherwise, MS can hand over to a cell of a different MNC. If otherwise, MS may hand over to a cell of a different MNC.

5. Handover to a better cell of a different MNC first

1) Control strategy: If the neighboring cell and the serving cell are of different MNCs, and the receiving level of the neighboring cell is higher than its "Inter-cell HO threshold", this neighboring cell will be given priority in handover.

2) Application occasion: When cells of different MNCs serve properly, MS is expected to hand over to a cell of different MNC. Otherwise, MS may hand over to a cell providing better service. This control strategy is selected when well-covered cells of the same MNC are in congestion for lack of channels, and cells of different MNCs is allowed to share the traffic.

6. Handover to a cell of a different MNC first

1) Control strategy: If the neighboring cell and the serving cell are of different MNCs, and the receiving level of the neighboring cell is higher than its "Min-DL power on candidate cell", this neighboring cell will be given priority in handover.

2) Application occasion: When cells of different MNCs serve properly, MS is expected to hand over to a cell of a different MNC. Otherwise (i.e. MS can not detect signals in the cell of a different MNC), MS can hand over to a cell of the same MNC. This control strategy is selected when well-covered cells of the same MNC are in congestion for lack of channels, and cells of different MNCs is allowed to share the traffic.

7. Only handover to a cell of a different MNC allowed

1) Control strategy: MS can only hand over to a cell of a different MNC from the serving cell.

2) Application occasion: MS is expected to hand over to a cell of different MNCs.

EDGE HO allowed Range: Yes, No Unit - Default: No Recommended: No

Description:

Used to determine whether use the EDGE HO algorithm or not.

The principle of the EDGE HO algorithm is: after the MS accesses the circuit service, the call is handed over to the other cell after a fixed time.

When the EDGE HO algorithm is adopted, an EDGE or GPRS service network in addition with the circuit service network can be added. When the MS powers on, it will register the EDGE network and reside in the EDGE network. When the MS requires the circuit service, the MS accesses the EDGE network first, and then the call is handed over to the circuit service network after a few seconds (specified by the EDGE HO

algorithm). When the call finishes, the MS reselect the EDGE network. And when the MS requires the GPRS or EDGE service, the EDGE network provides the service for the MS.

Note:

This parameter is not allowed to be enabled in a general networking mode. It can only be used in the Overlay networking mode.

The EDGE HO algorithm requires that the MS resides in the EDGE network when the MS powers on. If a cell is configured to support the EDGE HO algorithm, the cell could not be the neighboring cell of other cells. Otherwise, the ping-pong HOs between two cells are induced.

EDGE HO min time (s) Range: 3~60 Unit second Default: 3 Recommended: 3

Description: Used to determine the minimum handover time after EDGE service begins.

Note: This parameter is not allowed to be enabled in a general networking mode, it can only be used in the Overlay networking mode.

DirectRtryRxLev Range: 0 - 63 Unit Level grade Default: 16 Recommended: 16

Description: This parameter defines the direct retry level threshold. It is used to filter the target cells for the direct retry.

Cell Description Table

Cell No. Range: 0~255 Unit - Default: - Description: Cell index.

Note: "Cell No" in the Cell Description Table ranges from 0 to 255. For any cells with Cell No. beyond 255, no request for handover to

these cells will be sent.

"External cell No" in the External Cell Description Table ranges from 0 to 799. For any cells with Cell No. beyond 799, no request for handover to these cells will be sent.

Layer of the cell

Range: 1~4, which are respectively corresponding to the PICO layer, MICRO layer, MACRO layer, and UMBRELLA layer.

Unit Layer Default: 3 Recommended: Configure it according to the practical situation.

Description:

The whole network can be divided into 4 layers: Umbrella, Macro, Micro, and Pico. Each layer can be set with 16 priorities. This meets the requirements of various complex networking environments. Generally, the Macro layer is used for main 900, Micro for main 1800, and Pico layer for 900 and 1800 microcell. The smaller the layer value, the higher the priority.

Cell priority Range: 1~16 Unit grade Default: 1 Recommended: 1

Description:

See the description of the parameter Layer of the Cell. This parameter is used to set the handover priority of the cells in the same layer. Generally, the priority of the cells in the same layer should be the same. For the cells on the same layer, the smaller the priority value, the higher the priority.

Inter-layer HO Thrsh. Range: 0~63. (-110dBm~-47dBm). Unit dB Default: 25 Recommended: 25

Description: The threshold for inter-layer Hierarchical Handover. This threshold should satisfy the following requirement: Inter-layer HO Thrsh. ³ Edge HO RX_LEV Thrsh. + Inter-cell HO hysteresis.

Notes: Make sure that the receiving level of the destination cell is higher than inter-layer HO threshold in hierarchical handover or load handover. Otherwise, MS hands over from large load high level

cell (high priority cell) to small load low level cell (low priority cell), and MS is disconnected as a result.

Inter-layer HO hysteresis Range: 0~63 Unit dB Default: 3 Recommended: 3

Description:

Indicates the hysteresis for inter-layer or inter-priority handover. It is used to avoid inter-layer Ping-Pong handover. Actual Inter-layer HO Thrsh. of serving cell = value of Inter-layer HO Thrsh. - Inter-layer HO hysteresis. Actual Inter-layer HO Thrsh. of adjacent cell = value of Inter-layer HO Thrsh. + Inter-layer HO hysteresis.

Penalty on fast moving HO Range: 0~63 Unit dB Default: 30 Recommended: 30

Description:

When MS is moving fast in Umbrella layer, the penalty will be given to other adjacent cells in other layers. This parameter determines the penalty level value. This parameter is valid only for the duration of "Penalty Time on Fast Moving HO".

Penalty time on fast moving HORange: 0~255 Unit Second Default: 40 Recommended: 40

Description:

It is the penalty time on the neighboring cell where the fast moving MS is handed over to. After the successful HO of the fast moving MS to the umbrella cell, the penalty on the neighboring cell handed over to be effective.

Min DL level on candidate cellRange: 0~63. (-110dBm~-47dBm). Unit grade Default: 15 Recommended: 15 Description: The minimum downlink receiving level required for the cell itself

to be the candidate cell.

Note:

1. This parameter can affect the handover success rate. MIN DL power on handover candidate cell must be greater than the receiving level of this cell. Otherwise, handover failure occurs.

2. The cell can enters into the candidate cell list only when its receiving level is greater than the sum of the min DL level on candidate cell and the min access level offset.

MS_TXPWR_MAX_CCH Range: 0~31 Unit - Default: 5(900M), 0(1800M). Recommended: 5(900M), 0(1800M). Description: The maximum MS transmitting power level during handover

access.

This parameter is mainly used for the judgment of the M criterion for MS in the dedicated mode. The M criterion determines whether an adjacent cell of MS can become a candidate cell. Its judgment is similar to the C1 criterion for cell selection. M="MS receiving level" - "Min DL level on candidate cell " - MAX (("MS_TXPWR_MAX_CCH" - "Min Access Level Offset"), 0) - "minimum access level offset". Only when M³ 0 can the adjacent cell become a candidate cell.

Note:

It is recommended the power levels of cells in GSM900 and DCS1800 corresponding to different dBm values. The 32 maximum transmitting power levels for GSM900 are:

{39, 39, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 11, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5,5, 5, 5, 5}

The 32 maximum transmitting power levels for DCS1800 are:

{30,28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 34, 32}.

UL expected level at HO accessRange: 0~63. (-110dBm~-47dBm). Unit grade Default: 35 Recommended: 35 Description: Indicates the expected uplink receiving level on a target channel

when MS hands over. The value of this parameter should be consistent with the "Stable RX_LEV Expected" in conjunction with the power control algorithm and the "UL RX_LEV upper Thrsh." in conjunction with the HW II power control algorithm.

Cell type Range: Normal cell, concentric cell. Unit - Default: Normal cell Description: Whether it is IUO cell.

External Cell Description Table

External cell No. Range: 0~2999 Unit None Default: None Description: External cell index

"Cell No" in the Cell Description Table ranges from 0 to 255. For any cells with Cell No. beyond 255, no request for handover to these cells will be sent.

"External cell No" in the External Cell Description Table ranges from 0 to 2999. For any cells with Cell No. beyond 2999, no request for handover to these cells will be sent.

MSC shared or not Range: Yes/ No. Unit None Default: set based on actual situation Description: Whether the external cell shares MSC with the current BSC.

Note:

1. In the external cell description table, the cell number ranges from 0 to 2999.

2. The parameter "MSC shared or not" affects the sequencing of the cell in the 13th bit in the 16bit rule. Therefore, the improper setting of this parameter may lead to handover failure.

See the [Cell Description Table].

Adjacent Cell Relation Table

Ncell ID

Range: 0~255 for internal cells, and 0~2999 for external cells.

Unit -

Default: -

Recommended: Configure it according to the practical situation.

Description: The index number of a neighboring cell. Used to index the cell description data table and external cell description data table.

PBGT HO Thrsh.

Range: 0~127, corresponding to -64~63dB.

Unit -

Default: 68 for popular urban areas, 72 for suburbs.

Recommended: 68 for popular urban areas, 72 for suburbs.

Description:

A threshold in PBGT handover algorithm used to judge whether to perform PBGT handover. When "PBGT Handover Allowed" is set to "Yes" and "Inter-cell HO hysteresis"> "PBGT HO Thrsh.", the "Inter-cell HO hysteresis" will act instead of the "PBGT HO Thrsh."

When this parameter is assigned with a value smaller than 64, MS can hand over to a lower level neighboring cell.

Note:

When PBGT handover is enabled, and "Inter-cell HO hysteresis" > "PBGT HO Thrsh", the "Inter-cell HO hysteresis" instead of the "PBGT HO Thrsh" works. "PBGT HO Thrsh" must be adjusted as per handover performance statistic result and actual network.

Inter-cell HO hysteresis

Range: 0~63

Unit dB

Default: 4 dB populous urban areas and 8 dB for suburbs.

Recommended: 4 dB for populous urban areas and 8 dB for suburbs.

Description:

Indicates the handover hysteresis between adjacent cells of the same layer. The purpose of setting this parameter is to reduce the "Ping-Pong" handovers. The value of this parameter is invalid if cells are not on the same layer.

Min access level offset

Range: 0~63

Unit dB

Default: 0

Recommended: 0

Description:

This offset is based on the "Min DL level on Candidate Cell". For different adjacent cells, different offsets can be defined. Only when the receiving level of an adjacent cell ³ "Min DL Level on Candidate Cell" + this offset then this cell become a candidate cell.

Chained Adjacent Cell

Range: Yes, No

Unit -

Default: No

Description:

The cell in service and the neighboring cell are chained.

If the Select Pref. of Chain Adja Cell switch is enabled, the chained adjacent cell is preferred during the handover because of rapid decrease of level.

Frequency Offset HO Threshold

Range: 0-127

Unit -

Default: 68

Description:

When the difference between the downlink level of an adjacent cell and the downlink level of the serving cell is greater than the frequency offset handover threshold, the frequency offset handover to the adjacent cell occurs. In a real application, you need to subtract 64 from the value of this parameter.

Frequency Offset HO Chain Adjacent Cells

Range: Yes, No

Unit -

Default: No

Description:

The relation between the server cell and the adjacent cell is the adjacent cells of the frequency offset handover chain type. When the frequency offset handover occurs, the serving cell can be handed over only to the adjacent cell of the frequency offset handover chain type.

Filter Data Table

Allowed MR number lost Range: 0~32 Unit Number of MRs Default: 4 Recommended: 4

Description:

Indicates the number of MRs allowed losing during interpolation processing. If the number of MRs lost continuously is less than this value, the last MR received before the lost MRs and the next to the lost MRs will be averaged. The averaged value is regarded as the lost MR. Otherwise, all previous MRs are discarded, and

calculations are made again when new MRs are received.

Note:

MRs will lose continuously if the active cell does not serve well. Once the number of MRs lost continuously is greater than this parameter value, all previous MRs will be discarded and handover can not be realized. Therefore, it is advised to assign the parameter with a greater value to enable emergency handover.

Filter length for TCH level Range: 1~32 Unit - Default: 4 Recommended: 6

Description:

Indicates the number of MRs to be used to do TCH signal strength averaging calculation. When the filtering window is set to be too large, the impact of sudden change will be reduced, as well as the response speed for this kind of sudden change will be slower.

Filter length for TCH Qual. Range: 1~32 Unit - Default: 4 Recommended: 6

Description:

Indicates the number of MRs to be used to do TCH signal quality averaging calculation. When the filtering window is set to be too large, the impact of sudden change will be reduced, as well as the response speed for this kind of sudden change will be slower.

See the following table for reference about the relation between quality class and BER.

Quality class BER 0 Less than 0. 2% 1 0.2% to 0.4% 2 0.4% to 0.8% 3 0.8% to 1.6% 4 1.6% to 3.2% 5 3.2% to 6.4% 6 6.4% to 12.8% 7 Greater than 12.8% Filter length for SD level Range: 1~32

Unit - Default: 2 Recommended: 3

Description:

Indicates the number of MRs to be used to do SDCCH signal strength averaging calculation. The SDCCH occupation time by MS is shorter than the TCH occupation time. So the value of this parameter should be less than that of "Filter Length for TCH Level".

Filter length for SD Qual Range: 1~32 Unit - Default: 2 Recommended: 3

Description:

Indicates the number of MRs to be used to do SDCCH signal quality averaging calculation. The SDCCH occupation time by MS is shorter than the TCH occupation time, so the value of this parameter should be less than that of "Filter Length for TCH Qual."

Filter length for Ncell RX_LEVRange: 1~32 Unit - Default: 4 Recommended: 6

Description:

Indicates the number of MRs to be used to do neighboring cells signal strength averaging calculation. When the filter window is set to be too large, the impact of sudden change will be reduced, as well as the response speed for this kind of sudden change will be slower.

Filter length for TA Range: 1~32 Unit - Default: 4 Recommended: 6

Description: Indicates the number of MRs to be used to do TA averaging calculation.

Penalty Table

Penalty level after HO fail. Range: 0~63 Unit dB Default: 30 Recommended: 30

Description:

After the handover fails due to target cell congestion and other reasons (i.e. internal handover refuse message is received; or Um interface handover failure message is received in out-going BSC handover; or Um interface handover failure message is received in internal handover), a penalty will be given to this cell in order to avoid retry to hand over to this cell. This parameter is the penalty of signal level to be given. This penalty is valid only during the duration of "Penalty time after HO fail".

Penalty time after HO fail Range: 0~60 Unit second Default: 10 Recommended: 10

Description: See the description of "Penalty level after HO fail". This parameter indicates the duration for penalty.

Penalty level after BQ HO Fail.Range: 0~63 Unit dB Default: 63 Recommended: 63

Description:

When the emergency handover to a cell and the emergency handover fails; in order to avoid handing over back to this cell and "Ping-Pong" handover, a signal level penalty will be given to this cell. This parameter is the penalty of signal level to be given. This penalty is valid only during the duration of "Penalty time after BQ HO Fail.".

Penalty time after BQ HO Fail.Range: 0~60 Unit second Default: 15 Recommended: 10

Description: See the description of "Penalty level after BQ HO Fail. ". This parameter indicates the duration for penalty.

Penalty time after TA HO FailRange: 0~63 Unit dB Default: 63 Recommended: 63

Description:

When the emergency handover due to too great TA value in a cell and the emergency handover fails; In order to avoid handing over back to this cell and "Ping-Pong" handover, a signal level penalty will be given to this cell. This parameter is the penalty of signal level to be given. This penalty is valid only during the duration of "Penalty time after TA HO Fail".

Penalty time after TA HO Fail.Range: 0~60 Unit second Default: 10 Recommended: 10

Description: See the description of "Penalty level after TA HO Fail. ". This parameter indicates the duration for penalty.

OL-to-UL HO Failure Penalty Time(s)Range: 0 -255 Unit second Default: 10 Recommended: 10

Description: Once an overlaid-to-underlaid subcell handover fails, the call service handover from the overlaid subcell to the underlaid subcell is not allowed in the defined penalty time.

UL-to-OL HO Failure Penalty Time(s)Range: 10 -255 Unit second Default: 40 Recommended: 40

Description: Once an underlaid-to-overlaid subcell handover fails, the system forbids a call service handover from the underlaid subcell to the overlaid subcell in the defined penalty time.

UL-to-OL HO Failure Retry number

Range: 0 - 8 Unit - Default: 3 Recommended: 3

Description:

Upon UL-to-OL subcell handover decision, the system decides whether the number of handover failure retries has reached the UL-to-OL HO Failure Retry number. If yes, it stops UL-to-OL subcell handovers. Otherwise, the system will initiate an UL-to-OL subcell handover.

Description: If the UL-to-OL HO Failure Retry number is 0, there is no restriction on the number of retries upon handover failure, but there is restriction on the handover failure penalty time.

Emergency Handover Table

Note: To speed up the system response in HW_II handover algorithm, the target cell for emergency handover is selected only according to the cell sorting, regardless of P/N.

TA Thrsh. Range: 0~255 Unit bit period Default: 63( Normal cell), 219(Dual timeslot extension cell) Recommended: 63( Normal cell), 219(Dual timeslot extension cell)

Description: Emergency handover is triggered once TA is equal to or greater than this value.

DL Qual. Thrsh. Range: 0~70, corresponding to RQ (quality level 0~7) ´10 Unit - Default: 60 Recommended: 60

Description:

Indicates the downlink receiving quality threshold in order to trigger emergency handover due to the bad quality. When frequency hopping or DTX is used, it is recommended to set the value of this parameter to 70. When an emergency handover is triggered, the first-choice target cell is other cell. Only when there is no other cell serving as candidate cell and the "Intra-cell HO allowed" is "Yes" will the intra-cell handover be triggered.

UL Qual. Thrsh. Range: 0~70, corresponding to RQ (quality level 0~7) ´10 Unit - Default: 60 Recommended: 60

Description:

Indicates the uplink receiving quality threshold in order to trigger emergency handover due to the bad quality. When frequency hopping or DTX is used, it is recommended to set the value of this parameter to 70. When an emergency handover is triggered, the first-choice target cell is other cell. Only when there is no other cell serving as candidate cell and the "Intra-cell HO allowed" is "Yes" will the intra-cell handover be triggered.

UL Qual. Thrsh. for interf. HORange: 0~70, corresponding to RQ (quality level 0~7)´10 Unit - Default: 50 Recommended: 50

Description:

Indicates the uplink receiving quality threshold of triggering an interference handover.

When frequency hopping or DTX is enabled, it is recommended that you set this parameter to 60. When an interference handover is triggered, candidate cells are routinely sequenced and a target cell is selected.

If the current cell is ranked 1 and

• the "Intra-cell HO allowed" is "Yes", then the current cell is selected as the target cell.

• the "Intra-cell HO allowed" is "No", then the cell ranked 2 is selected as the target cell.

If the current cell is not ranked 1, directly select the cell ranked 1 as the target cell without determining the value of the "Intra-cell HO allowed" in the cell.

DL Qual. Thrsh. for interf. HORange: 0~70, corresponding to RQ (quality level 0~7)´10 Unit - Default: 50

Recommended: 50

Description:

Indicates the downlink receiving quality threshold of triggering an interference handover.

When frequency hopping or DTX is enabled, it is recommended that you set this parameter to 60.

When an interference handover is triggered, candidate cells are routinely sequenced and a target cell is selected.





Note:

The follows should be satisfied:

DL Qual. Thrsh.> DL Qual. Thrsh. for interf. HO and UL Qual. Thrsh.> UL Qual. Thrsh. for interf. HO.

UL RX_LEV Thrsh. for interf. HORange: 0~63. (-110dBm~-47dBm) Unit grade Default: 15 Recommended: 25

Description:

Only when the RX_Quality is very bad and the RX_Level exceed a certain threshold will the system regard there is interference.

This parameter indicates the uplink received level threshold of triggering an interference handover.




• the "Intra-cell HO allowed" is "No", then the cell ranked 2

is selected as the target cell.


DL RX_LEV Thrsh. for interf. HORange: 0~63. (-110dBm~-47dBm) Unit grade Default: 25 Recommended: 30

Description:

Only when the RX_Quality is very bad and the RX_Level exceed a certain threshold will the system regard there is interference.

This parameter indicates the threshold for downlink RX_Level.






Filter parameters A1~A8 Range: 0~20 Unit - Default: 10 Recommended: 10

Description:

Parameters for level fast drop filter, totally 9 parameters, including the filter parameter B. The actual values of A1~A8=(A1~A8)-10. The actual parameter B value = minus value of the B value is set. Their working formula is as follows:

C1(nt)=A1×C(nt)+A2×C(nt-t)+A3×C(nt-2t)+...+A8×C(nt-7t), where:

C (nt) is the uplink RX_Level of the serving cell in the MR received at the time of "nt".

If C1 (nt)<B, and C(nt) is below the "Edge HO RX_LEV Thrsh.", then the signal level is regarded to be fast deteriorating.

The parameters A1-A8 of the filter must meet the requirement: A1 + A2 + A3 + A4 + A5 + A6 + A7 + A8 = 80.

There are parameters less than or equal to 10 among the parameters A1-A8. Parameters A1-A8 correspond to the a1-a8 in the program, and ai = Ai - 10 (i=1 - 8). Therefore, there are values less than or equal to 0 among the parameters a1 - a8.

For example, if you want to see the fast level drop in a MR period, we need to set the A3-A8 as 10, A1 as 0, and A2 as 20. C1(nt) = a1*C (nt) + a2*C (nt-t) £½ 10C (nt - t) - 10C (nt). In order to trigger the fast level drop HO, it requires the C1 (nt) < B, and then the fast level drop appears in a MR period.

We can configure the filter to define the extent to which the level fast drops, that is whether the fast level drop occurs in a MR or multiple MR periods.

Filter parameter B Range: 0~255 Unit - Default: 0 Recommended: 0 Description: Used for the fast drop filter. MIN TA Range: 0~63 Unit bit period Default: 0 Recommended: 0

Description: In a single timeslot extended cell, MS can hand over from UnderLaid subcell to OverLaid subcell only when its TA is less than a certain threshold. This parameter indicates this threshold.

No DL Mr. HO Allowed Range: 0 or 1

Unit - Default: 0 Recommended: 0

Description:

This parameter is used to control the algorithm for No DL Mr. HO Allowed. If 0 is set for this parameter, the algorithm for No DL Mr. HO Allowed is disabled. If 1 is set for this parameter, the algorithm for No DL Mr. HO Allowed is enabled, and the HO decision on No DL Mr. HO Allowed in this cell is allowed.

No DL Mr. UI Qual HO Limit Range: 0~70 Unit - Default: 60 Recommended: 60

Description:

This parameter is the UL quality threshold for No DL Measurement Report emergent HO.

After the filtering, only when the UL quality is good than the No DL Mr. UI Qual HO Limit, the emergent HO is initiated. Otherwise, the emergent HO cannot be initiated.

During the emergent HO, the outgoing cell is preferred. If there is no other candidate cell and the intra-cell HO is enabled, the intra-cell HO is initiated.

Cons. No DL Mr. HO Allowed LimitRange: Integers from 0 to 64 Unit - Default: 8 Recommended: 8

Description:

This parameter is used to decide whether the No DL Mr. HO is allowed for a calling. For every calling, a global counter is set to count the number of continuous No DL measurement report. If the counted number achieves the Cons. No DL Mr. HO Allowed Limit, the calling is disabled by the algorithm for the continuous No DL measurement report HO. If the measurement report is resumed, the counter returns to 0.

Select Pref. of Chain Adja CellRange: Yes, No Unit -

Default: No Recommended: No

Description:

When this parameter is enabled, the chained neighboring cell is preferred during the HO when there is a rapid decrease of level. When this parameter is disabled, the algorithm for selecting chained neighboring cell during the HO when there is a rapid decrease of level is disabled.

Load Handover Table

System flux Thrsh. for load HORange: 0, 8~11; its corresponding percentage values: 0, 70, 80, 90, 95. Unit Flow grade Default: 10 Recommended: 10

Description:

For the load HO may trigger more HOs and increase the CPU load of the BM module, the load of the system CPU that is the system flow level must be considerate before the load HO.

The load handover occurs only when the system load is lower than a certain threshold. This parameter indicates the threshold. The value of this parameter cannot be too great.-Unexpected consequence might -occur when the system load is very high.

Load HO Thrsh.

Range: 1~7. Its corresponding percentage values: 50, 60, 70, 75, 80, 85, 90.

Unit Load grade Default: 7 Recommended: 7

Description:

The recommended value of Load HO Thrsh. is 7. The load handover will be triggered when the load of a cell exceeds "Load HO Thrsh.". The value of this parameter corresponds to TCH occupancy percentage.

Note:

Even if load handover is not active, such parameters as "Load HO Thrsh" and "Load HO Receiving Thrsh" will affect the sequence of candidate cells (BIT No.11 of 16 Bit criterions). Therefore, improper setting of this parameter will result in PBGT handover (and other handovers) failure when cell load is heavy.

Load Req. on candidate cell

Range: 0~6. Its corresponding percentage values: 0, 50, 60, 70, 75, 80, 85. .

Unit Load grade Default: 6 Recommended: 6

Description:

The recommended value of Load Req. on candidate cell is 5. The target cell is able to receive the handovers from other cells only when the load of the target cell is lower than "Load Req. on candidate cell". Otherwise, this cell refuses any handover request from other cells.

Note:

Even if load handover is not active, such parameters as "Load HO Thrsh" and "Load HO Receiving Thrsh" will affect the sequence of candidate cells (BIT No.11 of 16 Bit criterions). Therefore, improper setting of this parameter will result in PBGT handover (and other handovers) failure when cell load is heavy.

Load HO bandwidth Range: 0~63 Unit dB Default: 25 Recommended: 25

Description:

This parameter works together with other parameters to determine whether the handover is allowed. Only when the RX_Level of the serving cell is within the range of {Edge HO RX_LEV Thrsh., Edge HO RX_LEV Thrsh. + Load HO bandwidth} then the handover will be allowed.

Load HO step period Range: 1~60 Unit Second Default: 10 Recommended: 10 Description: When a cell is qualified for handover, handover requests might be

sent for all connections simultaneously. It will cause a sudden increase of CPU load and call-drop due to the congestion of the target cell. Therefore, these requests will be divided into bands based on the receiving strength. For example, band1 is within the range {Edge HO RX_LEV Thrsh., Edge HO RX_LEV Thrsh. + Load HO step period}; band2 is within the range {Edge HO RX_LEV Thrsh. + Load HO step period, Edge HO RX_LEV Thrsh. + 2 ´ Load HO step period}, and so on. Handovers are

performed band by band from the edge to the inner. Load HO step level Range: 1~60 Unit dB Default: 5 Recommended: 5

Description: This parameter indicates the interval between two different handover bands. See the description of " HO step level".

Normal Handover Data Table

Edge HO UL RX_LEV Thrsh. Range: 0~63. (-110dBm~-47dBm) Unit: grade Default: 10

Recommended:

25 for urban areas without PBGT handover being enabled

20 for remote suburbs

20 for urban areas with PBGT handover being enabled

Description:

Edge handover uplink receiving level threshold. The edge handover will be triggered if the uplink receiving level is constantly lower than "Edge HO UL RX_LEV Thrsh." within a period of time. If "PBGT HO allowed" is set to "Yes", the corresponding edge handover threshold will be lowered. In the case that "PBGT HO allowed" is set to "No", too low value of the Edge HO UL RX_LEV Thrsh is likely to cause overlapping coverage and co-channel interference.

Note:

1) Edge handover (uplink) downlink receiving level threshold < (uplink) downlink signal strength lower limit of G-II power control.

2) Edge handover (uplink) downlink receiving level threshold < expected stable (uplink) downlink signal strength of G-I power control.

Edge HO DL RX_LEV Thrsh Range: 0~63. (-110dBm~-47dBm) Unit grade

Default:




Recommended:




Description:

Edge handover downlink receiving level threshold. The edge handover will be triggered if the downlink receiving level is constantly lower than "Edge HO DL RX_LEV Thrsh." within a period of time. If "PBGT HO allowed" is set to "Yes", the corresponding edge handover threshold will be lowered. In the case that "PBGT HO allowed" is set to "No", too low value of the Edge HO DL RX_LEV Thrsh. is likely to cause overlapping coverage and co-channel interference.

Note:

1) Edge handover (uplink) downlink receiving level threshold < (uplink) downlink signal strength lower limit of G-II power control.

2) Edge handover (uplink) downlink receiving level threshold < expected stable (uplink) downlink signal strength of G-I power control.

Edge HO watch time Range: 1~16 Unit second Default: 3 Recommended: 5

Description: The uplink and downlink receiving level s are measured within "Edge HO watch time" so as to determine whether the edge handover is triggered.

Edge HO valid time Range: 1~16 Unit Second Default: 2 Recommended: 4

Description: To trigger an edge handover, the receiving level of the uplink or downlink should constantly remain lower than their corresponding

edge handover thresholds -y within a period of time. This parameter indicates this duration.

PBGT watch time Range: 1~16 Unit second Default: 3 Recommended: 5

Description: The path losses of adjacent cells and the serving cell are compared with "PBGT watch time" so as to determine whether the PBGT handover is triggered.

PBGT valid time Range: 1~16 Unit second Default: 2 Recommended: 4

Description: The PBGT handover will be triggered when the path loss of adjacent cells - the path loss of the serving cell > PBGT HO Thrsh. lasts "PBGT valid time".

Intracell TCHF-TCHH handover statistics timeRange: 1~16 Unit second Default: 3 Recommended: 5

Description:

According to the P/N rule, system judges whether to implement the handover based on the RQI of the measurement report. If within P seconds in N seconds, the RQI is higher than the handover threshold from TCHF to TCHH, the handover from TCHF-TCHH is triggered. If within P seconds in N seconds, the RQI is lower than the handover threshold from TCHH-TCHF, the handover from TCHH to TCHF is triggered. Here, the "N seconds" is the intracell TCHF-TCHH handover statistics time. "P seconds" is the intracell TCHF-TCHH handover observe time.

Intracell TCHF-TCHH handover lasting timeRange: 1~16 Unit second Default: 4

Recommended: 4

Description:

Within the intracell TCHF-TCHH handover statistics time, the lasting time that the RQI is higher than the handover threshold from TCHF to TCHH or lower than the handover threshold from TCHH to TCHF.

Handover threshold from TCHF to TCHHRange: 0~39 Unit - Default: 30 Recommended: 30

Description: Within a specified time, if the C/I of the TCHH is higher than the threshold value, the handover is triggered.

Handover threshold from TCHH to TCHFRange: 0~39 Unit - Default: 10 Recommended: 10

Description: Within a specified time, if the C/I of the TCHH is lower than the threshold value, the handover is triggered.

Layer HO watch time Range: 1~16 Unit Second Default: 5 Recommended: 5

Description: See the description of "PBGT watch time". This parameter is used for inter-layer handover decision.

Layer HO valid time Range: 0~16 Unit second Default: 4 Recommended: 4

Description: See the description of "PBGT valid time". This parameter is used for inter-layer handover decision.

MS Fast Moving HO Data Table

MS Fast-moving Watch cells Range: 1~10 Unit - Default: 3 Recommended: 3

Description:

The number of cells used to judge whether MS is in fast moving state. It is not good for the system load to decrease effectively if this parameter value is too great, but too small the value will cause inaccurate judgement.

MS Fast-moving Valid cells Range: 1~10 Unit - Default: 2 Recommended: 2

Description:

This parameter works together with "MS Fast-moving Watch cells". When an MS has achieved the value set in "MS Fast-moving Watch cells", and if there are "MS Fast-moving Valid cells" that are crossed fast. In this case, fast moving handover will be triggered.

MS Fast-moving time Thrsh. Range: 0~255 Unit second Default: 15 Recommended: 15

Description: If the time of an MS spent on crossing a cell is lower than "MS Fast-moving time Thrsh. ", the MS will be regarded as moving fast.

Note:

Terms to trigger fast-moving handover:

1) Serving cell is not level-4.

2) Destination cell is level-4.

Intra-cell Handover Data Table

MAX consecutive HO times Range: 1~20 Unit - Default: 3 Recommended: 3

Description:

If the interval of two continuous intra-cell handovers is less than "Interval for consecutive HO Jud." these two handovers will be regarded as consecutive intra-cell handovers. If the number of consecutive intra-cell handovers exceeds "MAX consecutive HO times", intra-cell handover will be forbidden within "Forbidden time after MAX times".

Forbidden time after MAX timesRange: 1~200 Unit second Default: 20 Recommended: 20 Description: See the description of "MAX consecutive HO times". Interval for consecutive HO Jud.Range: 1~200 Unit second Default: 6 Recommended: 6 Description: See the description of "MAX consecutive HO times".

Concentric Cell Handover Table

Direction for Concentric Cell HO - UL to OL HO AllowedRange: Yes/No Unit - Default: Yes Recommended: Yes

Description: Used to determine whether the handover is performed from UnderLaid subcell to OverLaid subcell.

Direction for Concentric Cell HO - OL to UL HO AllowedRange: Yes/No

Unit - Default: Yes Recommended: Yes

Description: Used to determine whether the handover is performed from OverLaid subcell to UnderLaid subcell.

Criterion for Concentric Cell HO - Rx_Lev for Concentric Cell HO Allowed Range: Yes/No Unit - Default: Yes Recommended: Yes

Description: Used to determine whether the receiving level of downlink is taken as the judgment condition in the Concentric Cell handover judgment.

Criterion for Concentric Cell HO - Rx_Qual for Concentric Cell HO Allowed Range: Yes/No Unit - Default: Yes Recommended: Yes

Description: Used to determine whether the receiving quality of downlink is taken as the judgment condition in the Concentric Cell handover judgment.

Criterion for Concentric Cell HO - TA Concentric Cell HO Allowed Range: Yes/No Unit - Default: Yes Recommended: Yes

Description: Used to determine whether TA is taken as the judgment condition in the Concentric Cell handover judgment.

Concentric Cell signal intensity differenceRange: 0~63 Unit dB Default: 5 Recommended: 5

Description:

Used to compensate the intensity difference between OverLaid subcell and UnderLaid subcell.

The parameter is invalidation while the "Enhanced Concentric Cell

Allowed" is set as "Yes".

Note:

Intensity difference between OverLaid subcell and UnderLaid subcell = Power amplification power difference between OverLaid subcell and UnderLaid subcell + combiner insertion loss difference + path loss difference caused by different antennas + path loss difference caused by different frequencies selected. The receiving levels of both OverLaid subcell and UnderLaid subcell should be measured on site, and the measurement should be performed on multiple sites if different antennas are used in OverLaid subcell and UnderLaid subcell.

RX-LEV Thrsh. Range: 0~63. (-110dBm~-47dBm). Unit grade Default: 35 Recommended: 35

Description:

When the "Enhanced Concentric Cell Allowed" is set as "No", RX-LEV Thrsh. works together with RX-LEV Hysteresis, RX-qual Thrsh, TA Thrsh. and TA hysteresis. This is to determine the boundary between OverLaid subcell and UnderLaid subcell. The value of this parameter must be greater than the "Edge HO Thrsh". It is recommended that RX-LEV Thrsh. > Edge HO Thrsh. + Concentric Cell Signal Intensity Difference.

The parameter is invalidation while the "Enhanced Concentric Cell Allowed" is set as "Yes".

RX-LEV Hysteresis Range: 0~63 Unit dB Default: 5 Recommended: 5

Description:

When the "Enhanced Concentric Cell Allowed" is set as "No", RX-LEV Hysteresis works together with RX-LEV Thrsh. RX-LEV Hysteresis, RX-qual Thrsh, TA Thrsh. and TA hysteresis. This is to determine the boundary between OverLaid subcell and UnderLaid subcell.

The parameter is invalidation while the "Enhanced Concentric Cell Allowed" is set as "Yes".

Receiving Quality Thrsh. Range: 0~70 Unit -

Default: 60 Recommended: 60

Description:

When the "Enhanced Concentric Cell Allowed" is set as "No", One of the parameters for determining the coverage of UnderLaid subcell and OverLaid subcell together with RX_LEV Thrsh., RX_LEV Hysteresis, TA Thrsh, and TA Hysteresis.

When the "Enhanced Concentric Cell Allowed" is set as "Yes", One of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell together with RX-qual Thrsh , UL to OL HO received level Thrsh., OL to UL HO received level Thrsh., TA Thrsh, and TA Hysteresis.

TA Thrsh. Range: 0~255 Unit Bit period. 1 bit period corresponds to 0.55km

Default: 63 (TA threshold is not used to distinguish the boundary between OverLaid subcell and UnderLaid subcell)

Recommended: 63

Description:

When the "Enhanced Concentric Cell Allowed" is set as "No", TA Thrsh. works together with RX-LEV Thrsh., RX-qual Thrsh, RX-LEV Hysteresis, and TA hysteresis. This is to determine the boundary between OverLaid subcell and UnderLaid subcell.

When the "Enhanced Concentric Cell Allowed" is set as "Yes", One of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell together with UL to OL HO received level Thrsh., OL to UL HO received level Thrsh., RX-qual Thrsh, TA Hysteresis.

The value of this parameter must be smaller than TA Thrsh. TA hysteresis Range: 0~63 Unit bit period, 1 bit period corresponding to 0.55km Default: 0 Recommended: 0

Description:

When the "Enhanced Concentric Cell Allowed" is set as "No", TA hysteresis works together with RX-LEV Thrsh., RX-LEV Hysteresis, RX-qual Thrsh and TA Thrsh. This is to determine the boundary between OverLaid subcell and UnderLaid subcell.

When the "Enhanced Concentric Cell Allowed" is set as "Yes", One of the parameters for determining the coverage of Underlaid subcell and

OverLaid subcell together with UL to OL HO received level Thrsh., OL to UL HO received level Thrsh., RX-qual Thrsh , TA Thrsh .

Note:

The above 5 parameters determine the coverage range of OverLaid subcell and UnderLaid subcell for common Concentric Cell.

OverLaid subcell coverage range can be indicated as follows:

Receiving level ≥ RX-LEV Thrsh. + RX-LEV Hysteresis; TA ≤ TA Thrsh.- TA hysteresis; Receiving quality<RX-QUAL Thrsh.

UnderLaid subcell coverage range can be indicated as follows:

Receiving level ≥ RX-LEV Thrsh. - RX-LEV Hysteresis; -TA ≥ TA Thrsh. + TA hysteresis; Receiving quality ≥ RX-QUAL Thrsh.

There is a hysteresis band between OverLaid subcell and UnderLaid subcell which is used to avoid "Ping-Pong" handovers (as shown below).

RX-LEV Thrsh. - RX-LEV Hysteresis ≤ Receiving level ≤ RX-LEV Thrsh. + RX-LEV Hysteresis and TA Thrsh. - TA hysteresis ≤ TA ≤ TA Thrsh. + TA hysteresis

If the TA Thrsh. is 63, and the TA Hysteresis is 0, then the boundary of the OverLaid subcell is completely determined by the receiving level parameters.

If the RX-LEV Thrsh. is 63, and the RX-LEV Hysteresis is 0,then the boundary of the UnderLaid subcell is completely determined by the TA parameters.

Concentric Cell HO watch timeRange: 0~16 Unit second Default: 5 Recommended: 5

Description: See the description of "PBGT watch time". This parameter is used for Concentric Cell handover" decision.

Concentric Cell HO valid timeRange: 0~16 Unit second Default: 4

Recommended: 4

Description: See the description of "PBGT valid time". This parameter is used for Concentric Cell handover decision.

Assign optimum layer

Range: System optimization, UnderLaid subcell, OverLaid subcell, No preference.

Unit -

Default: When "Cell system type" is set as "GSM900/DCS1800", the default is "System optimization"; When "Cell system type" is set as enhanced concentric cell or CoBCCH cell, the default is "Underlaid subcell".

Recommended: When "Cell system type" is set as "GSM900/DCS1800", the default is "System optimization"; When "Cell system type" is set as enhanced concentric cell or CoBCCH cell, the default is "Underlaid subcell".

Description:

In the Concentric cell, assign styles following:

1) System optimization mode indicate the system selects the optimum layer for TCH assignment as according to MRs provided through the UL's SDCCH

2) UnderLaid Subcell: UnderLaid Subcells are assigned first;

3) OverLaid Subcell: OverLaid Subcells are assigned first;

4) No preference: no specified instruction. Assign-Optimum-Level Thrsh.Range: 0~63, (-110dBm~-47dBm). Unit dBm Default: 35 Recommended: 35

Description:

After selection of optimal layer, the current SDCCH level can be estimated (inserted/ filtered) as per the uplink measurement result in the previous SDCCH MR. OverLaid subcells and UnderLaid subcells are allocated as per the comparison result between the receiving level of SDCCH and "Assign-Optimum-Level Thrsh", and that between TA and "Assign-Optimum-TA Thrsh". That is, MS will be allocated with OverLaid Subcell only if the receiving level is greater than "Assign-Optimum-Level Thrsh", and TA smaller than "Assign-Optimum-TA Thrsh". Otherwise, MS are allocated with UnderLaid cells to ensure the successful assignment.

Note: If SDCCH is on an external circle: this thrsh. = edge handover threshold +internal/external circle signal strength difference + balanced

uplink/downlink margin + SDCCH and TCH differential margin. If SDCCH is on an internal circle: this thrsh. (Temporarily set as 25) = edge handover threshold + uplink/downlink balanced margin + SDCCH and TCH differential margin.

TA Thrsh. of Assignment Pref.Range: 0~255 Unit none Default: 63 Recommended: 63

Description:

After selection of optimal layer, the current SDCCH level can be estimated (inserted/ filtered) as per the uplink measurement result in the previous SDCCH MR. OverLaid subcells and UnderLaid subcells are allocated as per the comparison result between the receiving level of SDCCH and "Assign-Optimum-Level Thrsh", and that between TA and "Assign-Optimum-TA Thrsh". That is, MS will be allocated with UnderLaid Subcell only if the receiving level is greater than "Assign-Optimum-Level Thrsh", and TA smaller than "Assign-Optimum-TA Thrsh". Otherwise, MS are allocated with OverLaid cells to ensure the successful assignment.

TA pref. Of Imme-Assign AllowedRange: Yes (1)/ No (0) Unit - Default: Yes (1) Recommended: Yes (1)

Description:

It determinates whether the system allocates channel according to ACCESS_DELAY in CHANNEL_REQUEST message.

If it is set as "No", system prefer the channel in Underlaid subcell; if it is set as "No", system prefer the channel in overlaid subcell while ACCESS_DELAY is less than "TA Thrsh. Of Imme- Assign pref.", otherwise prefer the channel in Underlaid subcell.

TA Thrsh. Of Imme- Assign pref.Range: 0~255 Unit -

Default: 60 for double timeslots extended cell

0 for others.

Recommended: 60 for double timeslots extended cell

0 for others.

Description:

While the TA pref. Of Imme-Assign Allowed is set as "Yes" and the ACCESS_DELAY in CHANNEL REQUEST message is less than "TA Thrsh. Of Imme- Assign pref.", system will prefer the channel in overlaid subcell, otherwise prefer the channel in underlaid subcell.

Pref. subcell in HO of intra-BSC

Range: System Optimization, OverLaid Subcell, UnderLaid Subcell, No Preference.

Unit - Default: UnderLaid Subcell Recommended: UnderLaid Subcell

Description:

The incoming HO intra-BSC optimum algorithm allowed. When a cell is configured as an Concentric cell, the four processing methods of incoming intra-BSC handover request in BSC are

1) System Optimization, Add the receiving level of the target Concentric cell with the handover request. Then the target cell compares the receiving level with RX_LEV Thrsh. to select the optimum layer, without regard to RX_LEV Hysteresis.

2) UnderLaid Subcell: UnderLaid Subcells are assigned first;

3) OverLaid Subcell: OverLaid Subcells are assigned first.

4) No priority: Channels are allocated based on normal algorithm without specified instruction.

Incoming-to-BSC HO optimum layerRange: UnderLaid subcell, OverLaid subcell, No preference. Unit - Default: UnderLaid subcell

Recommended:

Generally, the inter-BSC handover is triggered at the edge of a cell. In this case, the UnderLaid subcell can be selected preferably. In the case of 1800 and 900 that share the same site location, the inter-BSC handover is hardly triggered at the edge of a cell. The OverLaid subcell can be selected preferably. If the handover success rate is low, it is recommended that the UnderLaid subcell should be selected preferably.

Description: Determines whether the UnderLaid subcell or OverLaid subcell channel is preferred during the incoming-to-BSC HO.

Note: BCCH carrier must be configured as UnderLaid subcell.

1) The carrier with SDCCH must be configured as UnderLaid subcell.

2) The handover between OverLaid and UnderLaid subcells will be forbidden If both RX-LEV Thrsh. and RX-LEV Hysteresis are 63.

3) The handover between OverLaid and UnderLaid subcells will be forbidden If both TA Thrsh. and TA Hysteresis are 63.

4) The dual timeslot extended cell adopts Concentric Cell for data configuration. See the reference for dual timeslot extended cell.

Enhanced Concentric Cell allowedRange: Yes / No Unit - Default: Yes Recommended: Yes Description: It determinates whether the cell support enhanced IUO. OL to UL HO received level Thrsh.Range: 0~63 (-110dBm ~ -47dBm) Unit - Default: 20 Recommended: 25

Description:

When the "Enhanced Concentric Cell Allowed" is set as "Yes", one of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell for enhanced Concentric Cell together with RX-qual Thrsh , UL to OL HO received level Thrsh., OL to UL HO received level Thrsh., TA Thrsh, and TA Hysteresis.

UL to OL HO received level Thrsh.Range: 0~63 (-110dBm ~-47dBm) Unit - Default: 30 Recommended: 35

Description:

When the "Enhanced Concentric Cell Allowed" is set as "Yes", one of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell for enhanced Concentric Cell together with RX-qual Thrsh , UL to OL HO received level Thrsh., OL to UL HO received level Thrsh., TA Thrsh, and TA Hysteresis.

Note:

The coverage of OverLaid subcell of enhanced Concentric Cell:

Receive Level >= UL to OL HO received level Thrsh. and TA<(TA Thrsh. - TA Hysteresis) and Receive Quality < RX-qual Thrsh

The coverage of Underlaid subcell of enhanced Concentric Cell:

Receive Level < OL to UL HO received level Thrsh. or TA >=(TA Thrsh. + TA Hysteresis) or Receive Quality >=RX-qual Thrsh

There is an "empty" area between Overlaid subcell and Underlaid subcell described by the above formula, the area is the hysteresis area of Concentric Cell, it is used to prevent ping-pong handover.

The range of empty area is restricted by the follow formula.

OL to UL HO received level Thrsh. <= Receive Level < UL to OL HO received level Thrsh. and (TA Thrsh. - TA Hysteresis) <= TA < (TA Thrsh. + TA Hysteresis)

UL to OL Traffic HO Allowed

Range: Yes/ No

Unit -

Default: Yes

Recommended: Yes

Description:

It determines whether the traffic in underlaid subcell is one of conditions for underlaid to overlaid handover. If it is set as "Yes", and the traffic in underlaid subcell is over "Traffic Thrsh. of underlaid", MS will hand over from underlaid to overlaid.

If "UL to OL Traffic HO Allowed" is set as "No", and the traffic in underlaid subcell will not be considered when MS hand over from underlaid to overlaid.

Note:

1.When "Enhanced Concentric Cell allowed" is set as "Yes", it is available.

2. If the RX_LEV for UO HO Allowed, RX_QUAL for UO HO Allowed, and TA for UO HO Allowed are enabled, the condition for

triggering the underlay cell HO must meet the level, quality, and TA requirement of the HO from the underlay cell to the overlay cell.

Load thrsh of Underlay

Range: 0~100

Unit -

Default: 80

Recommended: 80

Description:

If "UL to OL Traffic HO Allowed" is set as "Yes", and the traffic in underlaid subcell is over "Traffic Thrsh. of underlaid", MS will hand over from underlaid to overlaid; otherwise MS will stay in underlaid subcell because the signal quality is good.

If "UL to OL Traffic HO Allowed" is set as "No", and the traffic in underlaid subcell will not be considered when MS hand over from underlaid to overlaid.

Note: When Enhanced Concentric Cell allowed and UL to OL Traffic HO Allowed are set as "Yes", it is available.

Underlaid HO Step period

Range: 1~255

Unit Second

Default: 5

Recommended: 5

Description:

If there are some handover requests from underlaid subcell to overlaid at the same time, system will hand over the call with low level. This does not accord with the principle that the best call shall be handed over firstly.

The grade by grade algorithm is used to hand over an MS with high

level.

The parameter is the time for that the handover band level decreases "Underlaid HO Step level".

Note: When "Enhanced Concentric Cell allowed" is set as "Yes", it is available.

Underlaid HO Step level

Range: 1~63

Unit -

Default: 5

Recommended: 5

Description:

In the grade by grade handover from underlaid to overlaid, the handover band is extended from 63 to 1. This can hand over the call with high level firstly.

The parameter is the step that handover band decreases.

Note:

It is used to control the grade by grade handover band from underlaid to overlaid with "Underlaid HO Step period".

The "Underlaid HO Step period" is the time for that the handover band level decreases "Underlaid HO Step level".


Penalty Time of UL to OL HO (s)

Range: 0~255

Unit Second

Default: 10

Recommended: 10

Description:

If "Penalty allowed" is set to "Yes" in the [Handover control table], when a call is handed over from an underlaid to overlaid subcell, to prevent ping-pong handover, the call cannot be handed back to the underlaid subcell in the "Penalty Time of UL to OL HO (S)".

If this parameter is set to 0, there is no penalty for the UL-to-OL handover.

High load thrsh of underlay

Range: 0-100

Unit None

Default: 90

Recommended: 90

Description:

The high load thrsh of underlay must be higher or equal to ULload normal thrsh. When the thrsh is higher than the normal thrsh, the period of UL to OL hierarchical load sharing HO will be shortened, and the UL to OL HO will speed up.


U to O load HO period step level

Range: 0-255

Unit None

Default: 1

Recommended: 1

Description: When the UL traffic is heavily loaded, subtract the "1" from the UL to OL load HO period to speed up the UL to OL HO. 0 t stands for not modifying UL to OL HO period.


Low load thrsh of underlay

Range: 0-100

Unit None

Default: 0

Recommended: 0

Description:

To offer better conversation quality and aggressive multiplexing of OL TRXs, OL can be handed over to UL when the UL load is lower than Low Load of Ul. 0 means that OL to UL Load HO is closed Only when UL load Ho is switched to ON can UL to OL be overhanded.


OL to UL HO period(s)

Range: 1 - 255

Unit s

Default: 5

Recommended: 5

Description:

Many calls request OL to UL HO at the same time. The high level calls may be handed over earlier. The low received level calls have the priority to be handed over according to the hierarchical handover algorithm. This period is the time that the handover range takes to descend OL to UL HO step length.


OL to UL HO step level

Range: 1-63

Unit none

Default: 5

Recommended: 5

Description: The handover range increases step by step from the lowest level (OL to UL HO received RX_LEV ) to the highest level (63). The call that is not

so capable of receiving RX_LEV has the priority to be overhanded. The handover range increases upwardly the width of OL to UL HO step length. The time that handover range takes to increase OL to UL HO step length is OL to UL HO period.


ATCB HO allowed

Range: 0, 1 .

Unit none

Default: 0

Recommended: According to the actual situation

Description:

It determined whether ATCB handover algorithm carries out or not. If ATCB HO allowed is opened, ATCB HO performs decision and processing of OL to UL HO step length. If not, ATCB does not perform the function.

Note: When "Enhanced Concentric Cell allowed" and "ATCB HO allowed" are set as "Yes", it is available.

Thrsh of ATCB

Range: 1 - 63

Unit dB

Default: 5

Recommended: 5

Description:

It is set on the basis of comprehensively considering the mutual effect between concentric cell and adjacent cell. It is the OL coverage area that links the serving cell and neighboring cell. The greater the value of the Thrsh of ATCB is, the smaller the coverage area of OL is.

ATCB hysteresis

Range: 0-63

Unit dB

Default: 2

Recommended: 2

Description: Interval hysteresis that OL and UL cover.

Note: When "Enhanced Concentric Cell allowed" and "ATCB HO allowed" are set as "Yes", it is available.

Frequency Offset Handover Table

Frequency Offset HO Algorithm Allowed

Range: Yes, No

Unit -

Default: -

Recommended: -

Description: By setting this parameter, you can determine whether to use the frequency offset handover algorithm.

Frequency Offset Handover Uplink Trigger Level

Range: 0~63

Unit dBm

Default: 63

Recommended: 63

Description:

This parameter is used to set the value of the uplink level for triggering frequency offset handover. If the uplink level of the serving cell is greater than the value of this parameter, the frequency offset handover does not occur. If you set the maximum value of this parameter, the parameter does not take effect.

Frequency Offset Handover Downlink Trigger Level

Range: 0~63

Unit dBm

Default: 30

Recommended: 30

Description:

This parameter is used to set the value of the downlink level for triggering frequency offset handover. If the downlink level of the serving cell is greater than the value of this parameter, the frequency offset handover does not occur.

Quick Move Speed Threshold

Range: 0~600

Unit m/s

Default: 42

Recommended: 42

Description:

This parameter is used to set the speed threshold for triggering frequency offset handover. The speed threshold varies with specific scenarios. If the speed at which the MS moves is smaller than the speed threshold, the frequency offset handover does not occur.

Frequency Offset Handover Statistic Time

Range: 1-32

Unit 0.5s

Default: 4

Recommended: 4

Description: This parameter is used to set the frequency offset handover statistic time for determining whether to trigger frequency offset handover.

Frequency Offset Handover Duration

Range: 1-32

Unit 0.5s

Default: 3

Recommended: 3

Description: This parameter is used to set the frequency offset handover duration for determining whether to trigger frequency offset handover.

Frequency Offset Handover Serving Cell Filter Length

Range: 1-20

Unit -

Default: 4

Recommended: 4

Description: This parameter is used to set the filter length of the frequency offset handover serving cell. Filter a is used for frequency offset handover. The filter length refers to the value of a in the filter a.

Frequency Offset Handover Adjacent Cell Filter Length

Range: 1-20

Unit -

Default: 4

Recommended: 4

Description: This parameter is used to set the filter length of the frequency offset handover adjacent cell. Filter a is used for frequency offset handover. The filter length refers to the value of a in the filter a.

Frequency Offset Handover Penalty Duration

Range: 0-255

Unit s

Default: 10

Recommended: 10

Description: This parameter is used to set the frequency offset handover penalty duration. It indicates the penalty duration for the original serving cell after frequency offset handover occurs.

Frequency Offset Handover Signal Strength Penalty

Range: 0-63

Unit Level specifications

Default: 63

Recommended: 63

Description:

This parameter is used to set the value of frequency offset handover signal strength penalty. It indicates the value of signal strength penalty of the original serving cell. This penalty aims to avoid ping pong handover after frequency offset handover occurs.

Number of Discarded Measurement Reports After Frequency Offset Handover

Range: 0-32

Unit -

Default: 1

Recommended: 1

Description:

This parameter is used to set the number of measurement reports discarded after frequency offset handover. It indicates how many measurement reports should be discarded before the judgment of frequency offset handover after the MS moves to a new cell.

huawei parameter

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