aqm(ran13.0_02)

AQM RAN13.0

Feature Parameter Description

Issue 02

Date 2011-06-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior

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WCDMA RAN

AQM Contents

Issue 02 (2011-06-30) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd

ii

Contents

1 Introduction ................................................................................................................................ 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience ........................................................................................................................ 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Technical Description .............................................................................................................. 2-1

3 Parameters ................................................................................................................................. 3-1

4 Counters ...................................................................................................................................... 4-1

5 Glossary ...................................................................................................................................... 5-1

6 Reference Documents ............................................................................................................. 6-1

WCDMA RAN

AQM 1 Introduction



1-1

1 Introduction

1.1 Scope

This document describes the feature "WRFD-011502 Active Queue Management (AQM)." The

document describes the AQM feature that reduces the delay in buffering the interactive service data and enhances equity between data streams through active detection and active packet discard.

1.2 Intended Audience

This document is intended for:

Personnel who are familiar with WCDMA basics

Personnel who need to understand AQM

Personnel who work with Huawei products

1.3 Change History

This section provides information on the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to the change in the AQM feature.

Editorial change: refers to the change in wording or the addition of the information that was not described in the earlier version.

Document Issues

The document issues are as follows:

02 (2011-06-30)

01 (2011-04-30)

Draft B (2011-03-30)

Draft A (2010-12-30)

02 (2011-06-30)

This is the document for the second commercial release of RAN13.0.

Compared with issue 01 (2011-04-30) of RAN13.0, this issue optimizes the description.

01 (2011-04-30)

This is the document for the first commercial release of RAN13.0.

Compared with issue Draft B (2011-03-30) of RAN13.0, this issue has no change.

Draft B (2011-03-30)

This is the draft of the document for RAN13.0.

Compared with Draft A (2010-12-30) of RAN13.0, this issue optimizes the description.

Draft A (2010-12-30)

This is the draft of the document for RAN13.0.

WCDMA RAN

AQM 1 Introduction



1-2

Compared with issue 01 (2010-03-30) of RAN12.0, this issue optimizes the description.

WCDMA RAN

AQM 2 Technical Description



2-1

2 Technical Description

Active Queue Management (AQM) can actively optimize the management of RLC queues to reduce the delay of HTTP service data in buffer queues.

Currently, most communication systems use Transmission Control Protocol (TCP) to guarantee the reliability of data services. When TCP is applied to the WCDMA network, one radio bearer (RB) can simultaneously use multiple TCP connections (multi-thread) and a great number of data packets may wait in the buffer queue, which leads to a high queuing delay. As a result, the following problems may occur:

When a queue is long, the round trip time (RTT) of the synchronization packet of a new connection is also long, whereas the initial value of the retransmission timeout (RTO) timer is relatively small. Therefore, the RTT may be longer than the RTO time, that is, the RTO timer may expire before the new connection is established.

When a high-priority traffic stream occupies most of the buffer, it is difficult for other streams to occupy the required bandwidth. As a result, the subsequent data packets of the other streams are likely to be discarded due to buffer overflow.

When consecutive loss of packets occurs due to buffer overflow, the TCP link takes a long time to retrieve the earlier data rate. In such a case, the link cannot be fully used.

AQM optimizes the management of RLC queues, reduces the situations that the HTTP service data are blocked by other services. It can improve the user experience in HTTP service.

The AQM algorithm applies to data transmission in the downlink rather than the uplink.

The AQM algorithm does not require support from other NEs.

The AQM algorithm must be implemented before the PDCP header compression algorithm is implemented.

The operator can choose whether to enable the AQM algorithm by setting the DRA_AQM_SWITCH, a sub-item of the DraSwitch parameter of the SET UCORRMALGOSWITCH command.

../RNCParaHtml/mbsc/m-para/UCORRMALGOSWITCH_DRASWITCH.HTML

WCDMA RAN

AQM 3 Parameters



3-1

3 Parameters

Table 3-1 Parameter description

Parameter ID NE MML Command Description

DraSwitch BSC6900

SET UCORRMALGOSWITCH

Meaning:Dynamic resource allocation switch group.

1. DRA_AQM_SWITCH: When the switch is on, the active queue management algorithm is used for the BSC6900.

2. DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm for admission CE-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH(DraSwitch) is set to ON.

3. DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for admission CE-based BE services.

4. DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm for coverage-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_COVER_BE_TTI_RECFG_SWITCH(DraSwitch) is set to ON.

5. DRA_BASE_COVER_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for coverage-based BE services.

6. DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm for differentiation-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_RES_BE_TTI_RECFG_SWITCH(DraSwitch) is set to ON.

7. DRA_BASE_RES_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for differentiation-based BE services.

8. DRA_DCCC_SWITCH: When the switch is on, the dynamic channel reconfiguration control algorithm is used for the BSC6900.

9. DRA_HSDPA_DL_FLOW_CONTROL_SWITCH: When the switch is on, flow control is enabled for HSDPA services in AM mode.

10. DRA_HSDPA_STATE_TRANS_SWITCH: When the

../RNCParaHtml/mbsc/m-para/UCORRMALGOSWITCH_DRASWITCH.HTML

../RNCParaHtml/mbsc/m-mml/SET-UCORRMALGOSWITCH.HTML



WCDMA RAN

AQM 3 Parameters



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switch is on, the status of the UE RRC that carrying HSDPA services can be changed to CELL_FACH at the BSC6900. If a PS BE service is carried over the HS-DSCH, the switch PS_BE_STATE_TRANS_SWITCH should be on simultaneously. If a PS real-time service is carried over the HS-DSCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be on simultaneously.

11. DRA_HSUPA_DCCC_SWITCH: When the switch is on, the DCCC algorithm is used for HSUPA. The DCCC switch must be also on before this switch takes effect.

12. DRA_HSUPA_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying HSUPA services can be changed to CELL_FACH at the BSC6900. If a PS BE service is carried over the E-DCH, the switch PS_BE_STATE_TRANS_SWITCH should be on simultaneously. If a PS real-time service is carried over the E-DCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be on simultaneously.

13. DRA_IP_SERVICE_QOS_SWITCH: Switch of the algorithm for increasing the quality of subscribed services. When this parameter is set to ON, the service priority weight of the subscriber whose key parameters (IP Address, IP Port, and IP Protocol Type) match the specified ones can be adjusted. In this way, the QoS is improved.

14. DRA_PS_BE_STATE_TRANS_SWITCH: When the switch is on, UE RRC status transition (CELL_FACH/CELL_PCH/URA_PCH) is allowed at the BSC6900.

15. DRA_PS_NON_BE_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying real-time services can be changed to CELL_FACH at the BSC6900.

16. DRA_R99_DL_FLOW_CONTROL_SWITCH: Under a poor radio environment, the QoS of high speed services drops considerably and the TX power is overly high. In this case, the BSC6900 can set restrictions on certain transmission formats based on the transmission quality, thus lowering traffic speed and TX power. When the switch is on, the R99 downlink flow control function is enabled.

17. DRA_THROUGHPUT_DCCC_SWITCH: When the switch is on, the DCCC based on traffic statistics is supported over the DCH.

18. DRA_VOICE_SAVE_CE_SWITCH: when the switch

WCDMA RAN

AQM 3 Parameters



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is on, the TTI selection based on the voice service type (including VoIP and CS over HSPA) is supported when the service is initially established.

19. DRA_VOICE_TTI_RECFG_SWITCH: when the switch is on, the TTI adjustment based on the voice service type (including VoIP and CS over HSPA) is supported.

20. DRA_CSPS_NO_PERIOD_RETRY_SWITCH: Whether to prohibit channel retries for CS and PS combined services. When this switch is turned on, channel retries are prohibited for CS and PS combined services. When this switch is turned off, channel retries are allowed for CS and PS combined services.

21. DRA_SMART_FAST_STATE_TRANS_SWITCH: Whether to activate the fast state transition algorithm. When this switch is turned on, the BSC6900 identifies UEs supporting fast state transition and then quickly transits the UEs from CELL_DCH to CELL_FACH.

22. DRA_PCH_UE_SMART_P2D_SWITCH: Whether to activate the algorithm for smart PCH-to-DCH state transition specific to UEs in the CELL_PCH or URA_PCH state. When this switch is turned on, the BSC6900 identifies UEs supporting smart PCH-to-DCH state transition and then transits the UEs from CELL_PCH or URA_PCH to CELL_DCH.

23. DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH: Whether initial TTI selection is allowed for differentiated BE services based on fairness

0: This switch is turned off. The TTI is selected according to the original algorithm.

1: This switch is turned on. In the dynamic TTI adjustment algorithm for differentiated BE services based on fairness, HSUPA UEs use 10-ms TTI if the RTWP, occupied Iub bandwidth, or consumed CE resources are congested.

24. DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH: Whether to activate the coverage-based initial TTI selection algorithm specific to BE services. When this switch is turned on and conditions on 2 ms TTI specific to BE services has been met, the BSC6900 determines uplink coverage wideness of specific cells based on the Ec/N0 values reported by UEs during RRC connection. If the uplink coverage of the cells is weak, the BSC6900 allocates a 10 ms TTI to BE services as their initial TTI.

25. DRA_F2U_SWITCH: Whether to enable state transition from CELL_FACH to URA_PCH.When this switch is turned on, a UE can directly move from the

WCDMA RAN

AQM 3 Parameters



3-4


CELL_FACH to URA_PCH state. When this switch is turned off, a UE must move from the CELL_FACH to CELL_PCH and then to URA_PCH state.

GUI Value Range:DRA_AQM_SWITCH, DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH, DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH, DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH, DRA_BASE_COVER_BE_TTI_RECFG_SWITCH, DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH, DRA_BASE_RES_BE_TTI_RECFG_SWITCH, DRA_DCCC_SWITCH, DRA_HSDPA_DL_FLOW_CONTROL_SWITCH, DRA_HSDPA_STATE_TRANS_SWITCH, DRA_HSUPA_DCCC_SWITCH, DRA_HSUPA_STATE_TRANS_SWITCH, DRA_IP_SERVICE_QOS_SWITCH, DRA_PS_BE_STATE_TRANS_SWITCH, DRA_PS_NON_BE_STATE_TRANS_SWITCH, DRA_R99_DL_FLOW_CONTROL_SWITCH, DRA_THROUGHPUT_DCCC_SWITCH, DRA_VOICE_SAVE_CE_SWITCH, DRA_VOICE_TTI_RECFG_SWITCH, DRA_CSPS_NO_PERIOD_RETRY_SWITCH, DRA_SMART_FAST_STATE_TRANS_SWITCH, DRA_PCH_UE_SMART_P2D_SWITCH, DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH, DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH, DRA_F2U_SWITCH

Actual Value Range:DRA_AQM_SWITCH, DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH, DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH, DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH, DRA_BASE_COVER_BE_TTI_RECFG_SWITCH, DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH, DRA_BASE_RES_BE_TTI_RECFG_SWITCH, DRA_DCCC_SWITCH, DRA_HSDPA_DL_FLOW_CONTROL_SWITCH, DRA_HSDPA_STATE_TRANS_SWITCH, DRA_HSUPA_DCCC_SWITCH, DRA_HSUPA_STATE_TRANS_SWITCH, DRA_IP_SERVICE_QOS_SWITCH, DRA_PS_BE_STATE_TRANS_SWITCH, DRA_PS_NON_BE_STATE_TRANS_SWITCH, DRA_R99_DL_FLOW_CONTROL_SWITCH, DRA_THROUGHPUT_DCCC_SWITCH, DRA_VOICE_SAVE_CE_SWITCH, DRA_VOICE_TTI_RECFG_SWITCH, DRA_CSPS_NO_PERIOD_RETRY_SWITCH, DRA_SMART_FAST_STATE_TRANS_SWITCH, DRA_PCH_UE_SMART_P2D_SWITCH, DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH, DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH,

WCDMA RAN

AQM 3 Parameters



3-5


DRA_F2U_SWITCH

Unit:None

Default Value:DRA_AQM_SWITCH-0&DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH-0&DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH-1&DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-0&DRA_BASE_COVER_BE_TTI_RECFG_SWITCH-0&DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-0&DRA_BASE_RES_BE_TTI_RECFG_SWITCH-1&DRA_DCCC_SWITCH-1&DRA_HSDPA_DL_FLOW_CONTROL_SWITCH-0&DRA_HSDPA_STATE_TRANS_SWITCH-0&DRA_HSUPA_DCCC_SWITCH-1&DRA_HSUPA_STATE_TRANS_SWITCH-0&DRA_IP_SERVICE_QOS_SWITCH-0&DRA_PS_BE_STATE_TRANS_SWITCH-1&DRA_PS_NON_BE_STATE_TRANS_SWITCH-0&DRA_R99_DL_FLOW_CONTROL_SWITCH-0&DRA_THROUGHPUT_DCCC_SWITCH-0&DRA_VOICE_SAVE_CE_SWITCH-0&DRA_VOICE_TTI_RECFG_SWITCH-0&DRA_CSPS_NO_PERIOD_RETRY_SWITCH-0&DRA_SMART_FAST_STATE_TRANS_SWITCH-0&DRA_PCH_UE_SMART_P2D_SWITCH-0&DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH-0&DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH-0&DRA_F2U_SWITCH-0

WCDMA RAN

AQM 4 Counters



4-1

4 Counters

There are no specific counters associated with this feature.

WCDMA RAN

AQM 5 Glossary



5-1

5 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

Glossary.htm

WCDMA RAN

AQM 6 Reference Documents



6-1

6 Reference Documents

There are no specific reference documents associated with this feature.