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User Description, EGPRS Link QualityControl

USER DESCRIPTION


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Copyright

Ericsson AB 2001-2005 - All Rights Reserved

Disclaimer

No part of this document may be reproduced in any form without the writtenpermission of the copyright owner.

The contents of this document are subject to revision without notice due tocontinued progress in methodology, design, and manufacturing. Ericsson shallhave no liability for any error or damage of any kind resulting from the use

of this document.

Trademark List

Ericsson is a trademark owned by Telefonaktiebolaget LMEricsson.

All other product or service names mentioned in this User Description aretrademarks of their respective companies.

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User Description, EGPRS Link Quality Control

Contents

1 Introduction 1

2 Capabilites 3

2.1 Higher Bit Rates 3

2.2 Increased Capacity 3

3 Technical Description 5

3.1 General 5

3.2 Algorithm 6

3.3 Related Statistics 15

3.4 Main Changes in Ericsson GSM System R12/BSS R12 15

4 Engineering Guidelines 17

5 Parameters 19

5.1 Main Controlling Parameters 19

5.2 Parameters for Special Adjustments 19

5.3 Value Ranges and Default Values 20

6 Appendix 21

7 Concepts 51

Glossary 53

Reference List 55

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1 Introduction

Enhanced GPRS (EGPRS) supports the GMSK and 8-PSK modulationmethods on the radio interface and defines nine modulation and codingschemes. EGPRS Link Quality Control dynamically selects the most optimalmodulation and coding scheme for transmission of data over the radio interface.EGPRS Link Quality Control aims at maximizing the data throughput on theradio link and keeping the latency low.

There are two reasons for EGPRS Link Quality Control:

Higher bit rates Increased capacity

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2 Capabilites

2.1 Higher Bit Rates

EGPRS Link Quality Control increases the user bit rate over the radio interfaceby dynamically selecting the most optimal modulation and coding scheme fortransmission of data.

2.2 Increased Capacity

EGPRS Link Quality Control increases the system capacity. More users canbe served since it will take each user shorter time to transmit a given amountof data.

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3 Technical Description

3.1 General

Enhanced GPRS (EGPRS) supports the GMSK and 8-PSK modulationmethods on the radio interface and defines nine Modulation and CodingSchemes (MCSs). MCS-1 to MCS-4 are modulated with GMSK and MCS-5 toMCS-9 are modulated with 8-PSK.

The maximum data rates for the GMSK based MCSs are in general reached at

a lower radio link quality than for the MCSs that are based on 8-PSK. 8-PSK isless robust than GMSK but gains from an improved radio link quality where thegain for GMSK is negligible.

For each modulation method the low MCSs have high amounts of channelcoding, giving low data rates. The high MCSs have less channel coding whichgives high data rates. In the end, it is the combination of modulation methodand amount of channel coding that determines the characteristics of an MCS.The MCSs are summarised in Table 1 on page 5.

Table 1 The MCSs in EGPRS

MCS Modulation Coding

family

RLC data

block size(Bytes)

RLC data bit

rate (kbps)

MCS-1 GMSK C 22 8.8

MCS-2 GMSK B 28 11.2

MCS-3 GMSK A 37 14.8

MCS-4 GMSK C 2x22 17.6

MCS-5 8-PSK B 2x28 22.4

MCS-6 8-PSK A 2x37 29.6

MCS-7 8-PSK B 4x28 44.8

MCS-8 8-PSK A 4x34 54.4

MCS-9 8-PSK A 4x37 59.2

In EGPRS the RLC protocol is enhanced with the possibility to resegment datawithin the same coding family. Hence, it is possible to retransmit a radio blockwith a different MCS. The enhanced RLC protocol also makes it possible for thereceiver to store and use information (soft values) from previous transmissionsof the same RLC data block in order to increase the probability of successfuldecoding. This is called Incremental Redundancy (IR). The old soft values canbe combined with new soft values from the same RLC data block if the RLCdata block has not been resegmented. The receiver will store the soft values

until the RLC data block has been successfully decoded.

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EGPRS also supports the Bit Error Probability (BEP) measurement, which is an

improved radio link quality measurement. The mean value and the coefficientof variation of BEP reflect not only the C/I, but also factors like time dispersionand interleaving gain caused by velocity and frequency hopping.

The objective of EGPRS Link Quality Control (LQC) is to dynamically select themost optimal MCS for transmission of data over the radio interface.

3.2 Algorithm

3.2.1 General

The LQC algorithm is implemented in the Packet Control Unit (PCU).

On downlink the algorithm operates in either LA/IR, LA/IR-BLER or LAmode which is set by the parameter LQCMODEDL. All modes are actuallycombinations of both IR and LA. Soft values from not yet decoded RLC datablocks are always stored in the receiver of the MS for the purpose of jointdecoding and soft combining, independent of the LQC mode. Hence, allmodes can gain from the gradual increase of robustness which IR enables.Based on the LQC mode, radio link quality measurements and optionally thepercentage of incorrectly received RLC data blocks on downlink the algorithmdynamically selects the most optimal MCS to be used. The algorithm is appliedper downlink TBF.

On uplink IR is activated and deactivated with EGPRSIRUL and the algorithmoperates in either LA/IR, LA/IR-BLER or LA mode which is set by the parameterLQCMODEUL. Based on the LQC mode, radio link quality measurements andoptionally the percentage of incorrectly received RLC data blocks on uplink thealgorithm dynamically selects the most optimal MCS to be used. The algorithmis applied per uplink TBF.

3.2.2 LQC Mode

LA/IR mode

In LA/IR mode the MCS is adapted to the radio link quality using BEPmeasurements. The MCS selection is based on that the receiver at all timesuses IR for decoding and, therefore, high rate MCSs can often be used.Retransmissions are likely to occur but since high rate MCSs are used, thethroughput will still be high.

On downlink, if a lot of retransmissions occur due to poor radio conditions,the memory for storing soft values in the receiver can be filled. The MSsignals to the network that it has (or has not) memory problems withthe MS_OUT_OF_MEMORY indicator included in the EGPRS PACKETDOWNLINK ACK/NACK message, see Reference [7]. As a consequencethe algorithm will change to LA mode in order to reduce the number of

retransmissions. When the memory problem is solved, the mode will be

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changed back to LA/IR. This means that the algorithm may change LQC

mode within a TBF. On downlink the LQC mode will be LA/IR when RLCacknowledged mode is used and LQCMODEDL is set to 1.

On uplink the LQC mode will be LA/IR when RLC acknowledged mode is used,EGPRSIRUL is set to 1 and LQCMODEUL is set to 1.

LA/IR-BLER mode

In LA/IR-BLER mode the MCS is adapted to the radio link quality using acombination of BEP and BLER measurements. The MCS selection is basedon that the receiver at all times uses IR for decoding and, therefore, high rateMCSs can often be used. Retransmissions are likely to occur but since high rateMCSs are used, the throughput will still be high. Also, since BLER considerationapplies in this mode the MCS selection can be even more aggressive.

On downlink, if a lot of retransmissions occur due to poor radio conditions,the memory for storing soft values in the receiver can be filled. The MSsignals to the network that it has (or has not) memory problems withthe MS_OUT_OF_MEMORY indicator included in the EGPRS PACKETDOWNLINK ACK/NACK message, see Reference [7]. As a consequencethe algorithm will change to LA mode in order to reduce the number ofretransmissions. When the memory problem is solved, the mode will bechanged back to LA/IR-BLER. This means that the algorithm may change LQCmode within a TBF. On downlink the LQC mode will be LA/IR-BLER when RLCacknowledged mode is used and LQCMODEDL is set to 2.

On uplink the LQC mode will be LA/IR-BLER when RLC acknowledged mode isused, EGPRSIRUL is set to 1 and LQCMODEUL is set to 2.

LA mode

In LA mode the MCS is adapted to the radio link quality using BEPmeasurements. The MCS selection is not based on that the receiver uses IRand, hence, the MCS selection is more robust.

On downlink the LQC mode will be LA when RLC acknowledged mode is usedand LQCMODEDL is set to 0.

On uplink the LQC mode will be LA when RLC acknowledged mode is usedand EGPRSIRUL and/or LQCMODEUL is set to 0.

LA mode is also used on downlink and uplink in RLC unacknowledged mode(in which case no retransmissions are performed).

3.2.3 EIT Indication

In case the feature Support for EIT Streaming is switched ON the decisions takethe R99 QoS attributes Traffic Class and Transfer Delay into consideration. Thisapproach provides a method to differentiate between bitrate and delay sensitive

packet flows. A delay sensitive packet flow is identified as such when attribute

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Traffic Class is Streaming and the value of the attribute Transfer Delay is equal

to or lower than 800 ms. Such a packet flow is carried by EIT Streaming TBF.Any other packet flow is considered as bitrate sensitive. For more informationon Quality of Service and Support of EIT Streaming see Reference [4].

If EIT is indicated and RLC acknowledged mode is used, then the LQC modewill be LA/IR-BLER on downlink and LA/IR-BLER or LA on uplink. On uplink,if EGPRSIRUL is set to 1 and LQCMODEUL is set to 1 or 2 then the LQCmode will be LA/IR-BLER, otherwise the LQC mode will be LA. Separate MCSselection tables and BLER penalty tables will be used when EIT is indicated.

3.2.4 BEP Measurements

For a downlink TBF the MS measures the Bit Error Probability (BEP) for eachof the four bursts in every radio block it receives. The MS then calculatesthe mean value of BEP and the coefficient of variation (defined as standarddeviation divided by the mean value) of BEP for the radio block. The meanvalue of BEP and the coefficient of variation of BEP are then filtered in theMS in the linear domain. There are separate filters for GMSK and 8-PSKmeasurements. After filtering, the coefficient of variation of BEP is quantizedand put into the channel quality report as CV_BEP. The mean value of BEPis however first transformed to a logarithmic scale and then quantized beforebeing put into the channel quality report as MEAN_BEP. The measurementprocedure, including filters and reporting, is described in 3GPP TechnicalSpecification 45.008. The filter constant BEP_PERIOD determines how old and

new measurements shall be weighted together, and it is set to 7 (which impliesthat the forgetting factor is 0.3). The MS will send a channel quality report tothe PCU on request. Each report contains measurements of the radio linkquality in the downlink and is reported for GMSK and/or 8-PSK, depending onthe MCS(s) used during the measurement period. The channel quality reportis included in the EGPRS PACKET DOWNLINK ACK/NACK message anddefined in 3GPP Technical Specification 44.060.

For an uplink TBF the BTS performs the BEP measurements. For each radioblock the mean value of BEP and the coefficient of variation of BEP arecalculated and sent to the PCU. The PCU filters the BEP values for either GMSKor 8-PSK with the same technique as used for a downlink TBF (3GPP Technical

Specification 45.008). If 8-PSK is allowed then the BEP values for 8-PSK arefiltered, and any BEP values for GMSK are transformed (see Section 3.2.6 onpage 9) to BEP values for 8-PSK before filtering. If 8-PSK is not allowed thenno transformation is needed and the BEP values for GMSK are filtered. Notethat only the BEP values for the current suggested modulation method areused, the rest are discarded. Note also that the mean value of BEP as reportedfrom the BTS to the PCU has the range 0-127 compared to the range 0-31 for adownlink TBF. This improves the accuracy of the filtering. The PCU translatesthe mean value of BEP to the range 0-31 before selecting the MCS.

For downlink TBFs in LA/IR-BLER mode the BEP measurements are furtherfiltered in the PCU. MEAN_BEP and CV_BEP are filtered with a forgetting

factor of 0.07. This means that the BEP values used in the algorithm are more

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stable over time and a more stable MCS selection is a result of that. Still a quick

adaptation can be done to rapid changes in the radio environment.

3.2.5 BLER Calculations

When running in LA/IR-BLER mode the BLER is calculated per RLC data blockwith a forgetting factor according to the below formula:

BLER(n) = (1k) * BLER(n-1) + k * ACK_NACK

Where: k = 0.01 and ACK_NACK = 0 for an ACK and 1 for a NACK.

The calculated BLER value is used with the penalty table to adjust theMEAN_BEP value before selecting the MCS (note that BLER is used inpercentage format). On downlink the calculated BLER will be used incombination with the BEP measurements when at least three ACK/NACKbitmaps are available (from EGPRS PACKET DOWNLINK ACK/NACK) andthe penalty is updated at reception of about every fifth EGPRS PACKETDOWNLINK ACK/NACK. For an uplink TBF the calculated BLER will be usedwhen at least 50 RLC data blocks have been received and the penalty isupdated every 50th RLC data block.

3.2.6 Transformation of BEP between GMSK and 8-PSK

The BEP measurements can be GMSK and/or 8-PSK. If 8-PSK is allowedon the uplink then BEP values for GMSK will be transformed to BEP valuesfor 8-PSK before filtering. It is a fair assumption that CV_BEP is the samefor GMSK and 8-PSK but MEAN_BEP needs to be transformed. Thetransformation of MEAN_BEP is shown in Figure 1 on page 10.

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-1.4 -1.3 -1.2 -1.1 -1.0 -0.9 -0.8 -0.7 -0.6 -0.5-2.6

-2.4

-2.2

-2

-1.8

-1.6

-1.4

-1.2

-1.

-0.8

log10

(mean value of BEP) [8PSK]

log10

(meanvalueofB

EP)[GMSK]

Figure 1 Transformation of MEAN_BEP between GMSK and 8-PSK

Note that the transformation of MEAN_BEP is not needed for downlink TBFs.

3.2.7 Selecting the MCS

The selection of MCS depends on whether LQC operates in LA/IR, LA/IR-BLERor LA mode.

Selecting MCS in LA/IR mode

When no BEP measurements are available, typically for the first few radioblocks within a TBF, MCS-2 will be used as the initial MCS. When BEPmeasurements are available, the most optimal MCS will be selected based onthe values of MEAN_BEP and CV_BEP.

On downlink if the current suggested MCS is based on 8-PSK and MEAN_BEP

8-PSK is available, then use MEAN_BEP 8-PSK and CV_BEP and Table 5 on

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page 21 in Section 6 on page 21 to find the most optimal MCS. Otherwise

use MEAN_BEP GMSK and CV_BEP and Table 6 on page 22 in Section 6 onpage 21 to find the most optimal MCS.

On uplink if 8-PSK is allowed, then use MEAN_BEP and CV_BEP and Table 7on page 23 in Section 6 on page 21 to find the most optimal MCS. Otherwiseuse MEAN_BEP and CV_BEP and Table 8 on page 24 in Section 6 on page 21to find the most optimal MCS.

Selecting MCS in LA/IR-BLER mode


On downlink the MEAN_BEP is first adjusted by using the calculated BLER,current suggested MCS and Table 23 on page 42 in Section 6 on page 21.The penalty from the table is then accumulated to the MEAN_BEP. If thecurrent suggested MCS is based on 8-PSK and MEAN_BEP 8-PSK is available,then use adjusted MEAN_BEP 8-PSK and CV_BEP and Table 9 on page 26 inSection 6 on page 21 to find the most optimal MCS. Otherwise use adjustedMEAN_BEP GMSK and CV_BEP and Table 10 on page 27 in Section 6 on page21 to find the most optimal MCS. If EIT is indicated, Table 24 on page 45 willbe used instead and the optimal MCS will be obtained from Table 11 on page28 or Table 12 on page 29.

On uplink the MEAN_BEP is first adjusted by using the calculated BLER,current suggested MCS and Table 25 on page 46 in Section 6 on page 21. Thepenalty from the table is then accumulated to the MEAN_BEP. If 8-PSK isallowed, then use adjusted MEAN_BEP and CV_BEP and Table 13 on page 30in Section 6 on page 21 to find the most optimal MCS. Otherwise use adjustedMEAN_BEP and CV_BEP and Table 14 on page 32 in Section 6 on page 21to find the most optimal MCS. If EIT is indicated, Table 26 on page 49 will beused instead and the optimal MCS will be obtained from Table 15 on page33 or Table 16 on page 34.

Selecting MCS in LA mode


On downlink, if the current suggested MCS is based on 8-PSK and MEAN_BEP

8-PSK is available, then use MEAN_BEP 8-PSK and CV_BEP and Table 17 onpage 35 in Section 6 on page 21 to find the most optimal MCS. Otherwiseuse MEAN_BEP GMSK and CV_BEP and Table 18 on page 36 in Section 6 onpage 21 to find the most optimal MCS.

On uplink, if 8-PSK is allowed, then use MEAN_BEP and CV_BEP and Table

19 on page 38 in Section 6 on page 21 to find the most optimal MCS. Otherwise

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use MEAN_BEP and CV_BEP and Table 20 on page 39 in Section 6 on page

21 to find the most optimal MCS. If EIT is indicated the optimal MCS will beobtained from Table 21 on page 40 or Table 22 on page 41.

When RLC unacknowledged mode is used it is possible to have a more robustselection of MCS. By setting the parameter LQCUNACK to 1 or 2, the selectedMCS can be shifted 1 or 2 steps lower. For example if the MCS selectionindicates MCS-8 and LQCUNACK is set to 2, then MCS-6 will be used.However, if there is a shift from an MCS based on 8-PSK to an MCS based onGMSK, then MCS-2 to MCS-4 will not be used due to the low amount of channelcoding compared to MCS-5. For example if the MCS selection indicates MCS-5and LQCUNACK is set to 1, then MCS-1 will be used. See Table 2 on page 12.

Table 2 Steering the Selection of MCS to a More Robust Coding Scheme

SuggestedMCS

LQCUNACK=0 LQCUNACK=1 LQCUNACK=2

MCS-1 MCS-1 MCS-1 MCS-1






MCS-7 MCS-7 MCS-6 MCS-5MCS-8 MCS-8 MCS-7 MCS-6


3.2.8 Limitations in the Selection of MCS

In all LQC modes

If 8-PSK is not allowed to be used on the downlink, as given by the parameterPSKONBCCH, then all MCSs based on 8-PSK are removed from the evaluationprocess for a downlink TBF.

MCS-9 cannot be used on downlink in extended range cells (see Reference [1]).

It is possible to control the usage of the highest MCSs on both downlink anduplink. The parameter LQCHIGHMCS steers the highest allowed MCS. Forexample if LQCHIGHMCS is set to MCS-7, then MCS-8 and MCS-9 will notbe used.

If an MS is not 8-PSK capable on the uplink (see Reference [6]) then theselection of MCS on the uplink is limited to MCSs based on GMSK.

If the suggested MCS change from GMSK to 8-PSK on downlink or uplink, then

MCS-5 is the highest allowed MCS. If the following BEP values for 8-PSK

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indicate a higher (or lower) MCS, then that MCS will be used. Note that, on

uplink, the suggested MCS is not allowed to return to the same (or to a lessrobust) MCS ordered during the last 360 ms. In this way any frequent ping-pongin the MCS selection is avoided.

On downlink if the last amount of data in the PCU buffer can be fitted into anRLC data block using a more robust MCS within the same modulation method,then that MCS will be used instead. For example, if the suggested MCS isMCS-9 and the last amount of data in the PCU buffer can be fitted into one RLCdata block using MCS-5, then MCS-5 will be used instead of MCS-9. Thisreduces the risk of having to retransmit the last RLC data block.

In LA or LA/IR mode

On downlink to trigger a change from an MCS based on GMSK to an MCSbased on 8-PSK, the number of channel quality reports that indicate an MCSbased on 8-PSK must fulfil a leaky bucket algorithm. For every channel qualityreport that indicates an MCS based on 8-PSK the bucket size is increased withone unit, and for every channel quality report that indicates an MCS based onGMSK the bucket size is decreased with two units. The change to an MCSbased on 8-PSK is performed when the bucket size reaches five. This is toavoid any frequent ping-pong in the MCS selection. The first change, in a TBF,to an MCS based on 8-PSK will however be performed upon the reception ofthe first channel quality report that indicates an MCS based on 8-PSK.

In LA/IR-BLER mode

On downlink, if the amount of data in the MS buffer in the PCU is less than 600Bytes, a safer MCS is selected according to Table 3 on page 13. This reducesthe risk of having to retransmit the last RLC data blocks and, hence, it reducesthe latency for small amounts of data and for data at the end of large transfers.

Table 3 Steering the MSC Selection to a Safer MCS at Low Data in the MSBuffer in the PCU.

Suggested MCS MCS used if the MS buffer in the PCU is

less than 600 Bytes

MSC-1 MCS-1

MCS-2 MCS-1

MCS-3 MCS-1

MCS-4 MCS-2

MCS-5 MCS-2

MCS-6 MCS-3

MCS-7 MCS-5

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Table 3 Steering the MSC Selection to a Safer MCS at Low Data in the MS

Buffer in the PCU.

MCS-8 MCS-6

MCS-9 MCS-6

3.2.9 Resegmentation of Retransmissions

When LQC runs in LA/IR or LA/IR-BLER mode, resegmentation into otherMCSs for retransmissions will not be performed. However, when switchingfrom MCS-9 to MCS-3 due to poor radio conditions, MCS-6 will be usedfor retransmissions of old radio blocks and MCS-3 will be used for all new

radio blocks. The reason is that a change from MCS-9 to MCS-6 is not aresegmentation since one MCS-9 block can contain two RLC data blocks.MCS-7 and MCS-8 can also contain two RLC data blocks and they can beretransmitted with MCS-5 and MCS-6, respectively, without performing aresegmentation.

When LQC runs in LA mode the retransmissions can be resegmented. Thesame applies when LQC runs in LA/IR or LA/IR-BLER mode and the MSindicates memory problems. An RLC data block will be retransmitted with amore robust MCS if the current suggested MCS is lower than the MCS that theRLC data block was previously encoded with. The RLC data block will then beretransmitted with the highest possible, but not less robust, MCS in the samecoding family. For example if the suggested MCS is changed from MCS-9 toMCS-5 then the retransmission will be made with MCS-3. A resegmentation willbe performed if the RLC data block needs to be split into two parts.

Note that after six retransmissions of an RLC data block on downlink it willalways be sent with the most robust MCS, within the same coding family. Notethat the resegmentation rule still applies. This reduces the possible delayvariation. In LA/IR-BLER mode this limit is two retransmissions (in total threetransmissions).

3.2.10 LQC Switched OFF

LQC is switched ON or OFF per downlink and uplink direction with the parameterLQCACT. If LQC is switched OFF a default MCS will be used according to theparameters LQCDEFAULTMCSDL and LQCDEFAULTMCSUL. The initialMCS is however still MCS-2.

3.2.11 Hardware Requirements

A prerequisite for EGPRS and LQC is that the MS and the hardware andsoftware in the cell support EGPRS. There are three types of PDCHs:

B-PDCH is capable of handling GPRS CS-1 to CS-2

G-PDCH is capable of handling GPRS CS-1 to CS-4

E-PDCH is capable of handling EGPRS and GPRS CS-1 to CS-4

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A TBF can be reserved on several PDCHs. EGPRS will be used if the MS

supports EGPRS and all reserved PDCHs are E-PDCHs. If at least one of thereserved PDCHs is not capable of handling EGPRS, then GPRS will be used.

For more information on PDCH allocation and reservation, see Reference [3].

3.3 Related Statistics

See Reference [5].

3.4 Main Changes in Ericsson GSM System R12/BSS R12

IR and two new LQC modes on uplink are introduced. This is controlled byEGPRSIRUL and LQCMODEUL. New MCS selection and BLER penalty tableshave also been added for the new LQC modes on uplink. On downlink theparameter LQCIR has been renamed to LQCMODEDL.

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4 Engineering Guidelines

It is recommended to switch LQC ON for the downlink and uplink directions(LQCACT set to 3) and to use LA/IR-BLER mode for downlink TBFs(LQCMODEDL set to 2) and LA/IR mode for uplink TBFs (EGPRSIRUL andLQCMODEUL set to 1) in RLC acknowledged mode. It is not recommended tochange LQCHIGHMCS in order to limit the highest allowed MCS.

Higher bit rates can be achieved if the radio link quality is improved. The reasonis that the higher MCSs can be used more often. For example, the performance

can be better in a separate channel group with sparser frequency reuse sincethe interference level is lower.

Frequency hopping (see Reference [2]) has a moderate impact on the EGPRSperformance. MCSs with high amount of channel coding benefit from theincreased quality variation while the performance is reduced for MCSs withlow amount of channel coding. The overall impact of frequency hoppingon the EGPRS performance varies depending on the radio network. Inenvironments where the average radio link quality is high (C/I > 20 dB), theoverall performance is slightly reduced.

The usage of 8-PSK on the BCCH carrier may affect the signal strengthmeasurements performed by the MSs. The maximum average output power for

8-PSK is 3 dB lower compared to GMSK if the transceiver unit is configuredwith maximum output power. Even so, the average power decrease will besmall unless 8-PSK is used simultaneously on almost all timeslots. Further,any effect on the signal strength measurements will be reduced by filtering andhysteresis in the MSs and BSC. It is therefore not recommended to disable8-PSK on the BCCH carrier (using PSKONBCCH) since that would limit theperformance of EGPRS.

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5 Parameters

5.1 Main Controlling Parameters

EGPRSIRUL is used to switch IR ON and OFF for the uplink direction.If EGPRSIRUL is set to 0 then IR is deactivated. IfEGPRSIRUL is set to 1 then IR is activated. Theparameter is set per BSC.

LQCACT is used to switch LQC ON and OFF per downlink and

uplink direction. If LQCACT is set to 0 then LQC isswitched OFF for both directions. If LQCACT is setto 1 then LQC is switched ON only for the downlinkdirection. If LQCACT is set to 2 then LQC is switchedON only for the uplink direction. If LQCACT is set to3 then LQC is switched ON for both directions. Theparameter is set per BSC.

LQCMODEDL is used to control the LQC mode for downlink TBFs inRLC acknowledged mode. If LQCMODEDL is set to 0then LA mode will be used. If LQCMODEDL is set to 1then LA/IR mode will be used. If LQCMODEDL is set to2 then LA/IR-BLER mode will be used. The parameteris set per BSC.

LQCMODEUL is used to control the LQC mode for uplink TBFs inRLC acknowledged mode if EGPRSIRUL is set to 1(otherwise LA mode is always used). If LQCMODEUL isset to 0 then LA mode will be used. If LQCMODEUL isset to 1 then LA/IR mode will be used. If LQCMODEULis set to 2 then LA/IR-BLER mode will be used. Theparameter is set per BSC.

5.2 Parameters for Special Adjustments

LQCDEFAULTMCSDL

is used to control which MCS that shall be used on thedownlink when LQC is switched OFF. The parameteris set per BSC.

LQCDEFAULTMCSUL

is used to control which MCS that shall be used on theuplink when LQC is switched OFF. The parameter isset per BSC.

LQCHIGHMCS is used to limit the highest allowed MCS. The parameteris set per BSC.

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LQCUNACK is used to shift the selection of MCS to a more robust

one when RLC unacknowledged mode is used. Theparameter is set per BSC.

PSKONBCCH is used to disable the use of 8-PSK for downlink TBFson the BCCH carrier. The parameter is set per cell.

5.3 Value Ranges and Default Values

Table 4 Value Ranges and Default Values

Parameter name Default value Recommended

value

Value range Unit

EGPRSIRUL 1 1 0, 1 -

LQCACT 0 3 0 to 3 -

LQCMODEDL 1 2 0 to 2 -

LQCMODEUL 0 1 0 to 2 -

LQCDEFAULTMCSDL 5 5 1 to 9 -

LQCDEFAULTMCSUL 5 5 1 to 9 -

LQCHIGHMCS 9 9 1 to 9 -

LQCUNACK 1 2 0 to 2 -

PSKONBCCH ENABLED ENABLED ENABLED,

DISABLED

-

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6 Appendix

The suggested MCS in LA/IR mode for downlink TBFs depending on the valuesof MEAN_BEP and CV_BEP for 8-PSK is shown in Table 5 on page 21. Themappings of MEAN_BEP and CV_BEP to actual ranges of values can be foundin 3GPP Technical Specification 45.008.

Table 5 Suggested MCS in LA/IR Mode for Downlink TBFs with MEAN_BEP and CV_BEPfor 8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP

0 MCS-1 MCS-1 MCS-1 MCS-1 MCS-1 MCS-1 MCS-1 MCS-1























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Table 5 Suggested MCS in LA/IR Mode for Downlink TBFs with MEAN_BEP and CV_BEP

for 8-PSK










The suggested MCS in LA/IR mode for downlink TBFs depending on the valuesof MEAN_BEP and CV_BEP for GMSK is shown in Table 6 on page 22.

Table 6 Suggested MCS in LA/IR Mode for Downlink TBFs with MEAN_BEP and CV_BEPfor GMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP


















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Table 6 Suggested MCS in LA/IR Mode for Downlink TBFs with MEAN_BEP and CV_BEP

for GMSK
















The suggested MCS in LA/IR mode for uplink TBFs depending on the values ofMEAN_BEP and CV_BEP for 8-PSK is shown in .

Table 7 Suggested MCS in LA/IR Mode for Uplink TBFs with MEAN_BEP and CV_BEP for8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP












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Table 7 Suggested MCS in LA/IR Mode for Uplink TBFs with MEAN_BEP and CV_BEP for

8-PSK

















27 MCS-9 MCS-9 MCS-9 MCS-9 MCS-9 MCS-9 MCS-9 MCS-928 MCS-9 MCS-9 MCS-9 MCS-9 MCS-9 MCS-9 MCS-9 MCS-9




The suggested MCS in LA/IR mode for uplink TBFs depending on the values ofMEAN_BEP and CV_BEP for GMSK is shown in Table 8 on page 24.

Table 8 Suggested MCS in LA/IR Mode for Uplink TBFs with MEAN_BEP and CV_BEP forGMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP






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Table 8 Suggested MCS in LA/IR Mode for Uplink TBFs with MEAN_BEP and CV_BEP for

GMSK



























The suggested MCS in LA/IR-BLER mode for downlink TBFs depending on thevalues of adjusted MEAN_BEP and CV_BEP for 8-PSK is shown in Table 9on page 26.

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Table 9 Suggested MCS in LA/IR-BLER Mode for Downlink TBFs with Adjusted MEAN_BEP

and CV_BEP for 8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP






























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The suggested MCS in LA/IR-BLER mode for downlink TBFs depending on thevalues of adjusted MEAN_BEP and CV_BEP for GMSK is shown in Table 10on page 27.

Table 10 Suggested MCS in LA/IR-BLER Mode for Downlink TBFs with Adjusted MEAN_BEPand CV_BEP for GMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP























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and CV_BEP for GMSK










The suggested MCS in LA/IR-BLER mode for downlink EIT TBFs dependingon the values of adjusted MEAN_BEP and CV_BEP for 8-PSK is shown inTable 11 on page 28.

Table 11 Suggested MCS in LA/IR-BLER Mode for Downlink EIT TBFs with AdjustedMEAN_BEP and CV_BEP for 8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP

















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Table 11 Suggested MCS in LA/IR-BLER Mode for Downlink EIT TBFs with Adjusted

MEAN_BEP and CV_BEP for 8-PSK

















The suggested MCS in LA/IR-BLER mode for downlink EIT TBFs dependingon the values of adjusted MEAN_BEP and CV_BEP for GMSK is shown inTable 12 on page 29.

Table 12 Suggested MCS in LA/IR-BLER Mode for Downlink EIT TBFs with AdjustedMEAN_BEP and CV_BEP for GMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP










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Table 12 Suggested MCS in LA/IR-BLER Mode for Downlink EIT TBFs with Adjusted

MEAN_BEP and CV_BEP for GMSK























The suggested MCS in LA/IR-BLER mode for uplink TBFs depending on thevalues of adjusted MEAN_BEP and CV_BEP for 8-PSK is shown in Table 13on page 30.

Table 13 Suggested MCS in LA/IR-BLER Mode for Uplink TBFs with Adjusted MEAN_BEPand CV_BEP for 8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP



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Table 13 Suggested MCS in LA/IR-BLER Mode for Uplink TBFs with Adjusted MEAN_BEP































The suggested MCS in LA/IR-BLER mode for uplink TBFs depending on thevalues of adjusted MEAN_BEP and CV_BEP for GMSK is shown in Table 14on page 32.

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and CV_BEP for GMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP






























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and CV_BEP for GMSK



The suggested MCS in LA/IR-BLER mode for uplink EIT TBFs depending onthe values of adjusted MEAN_BEP and CV_BEP for 8-PSK is shown in Table15 on page 33.

Table 15 Suggested MCS in LA/IR-BLER Mode for Uplink EIT TBFs with Adjusted MEAN_BEPand CV_BEP for 8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP























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Table 15 Suggested MCS in LA/IR-BLER Mode for Uplink EIT TBFs with Adjusted MEAN_BEP











The suggested MCS in LA/IR-BLER mode for uplink EIT TBFs depending onthe values of adjusted MEAN_BEP and CV_BEP for GMSK is shown in Table16 on page 34.

Table 16 Suggested MCS in LA/IR-BLER Mode for Uplink EIT TBFs with Adjusted MEAN_BEPand CV_BEP for GMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP

















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Table 16 Suggested MCS in LA/IR-BLER Mode for Uplink EIT TBFs with Adjusted MEAN_BEP

and CV_BEP for GMSK

















The suggested MCS in LA mode for downlink TBFs depending on the values ofMEAN_BEP and CV_BEP for 8-PSK is shown in Table 17 on page 35.

Table 17 Suggested MCS in LA Mode for Downlink TBFs with MEAN_BEP and CV_BEPfor 8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP











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Table 17 Suggested MCS in LA Mode for Downlink TBFs with MEAN_BEP and CV_BEP

for 8-PSK






















The suggested MCS in LA mode for downlink TBFs depending on the values ofMEAN_BEP and CV_BEP for GMSK is shown in Table 18 on page 36.

Table 18 Suggested MCS in LA Mode for Downlink TBFs with MEAN_BEP and CV_BEPfor GMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP





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Table 18 Suggested MCS in LA Mode for Downlink TBFs with MEAN_BEP and CV_BEP

for GMSK




























The suggested MCS in LA mode for uplink TBFs depending on the values ofMEAN_BEP and CV_BEP for 8-PSK is shown in Table 19 on page 38.

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Table 19 Suggested MCS in LA Mode for Uplink TBFs with MEAN_BEP and CV_BEP for

8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP






























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8-PSK



The suggested MCS in LA mode for uplink TBFs depending on the values ofMEAN_BEP and CV_BEP for GMSK is shown in Table 20 on page 39.

Table 20 Suggested MCS in LA Mode for Uplink TBFs with MEAN_BEP and CV_BEP forGMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP
























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GMSK









The suggested MCS in LA mode for uplink EIT TBFs depending on the valuesof MEAN_BEP and CV_BEP for 8-PSK is shown in Table 21 on page 40.

Table 21 Suggested MCS in LA Mode for Uplink EIT TBFs with MEAN_BEP and CV_BEPfor 8-PSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP


















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Table 21 Suggested MCS in LA Mode for Uplink EIT TBFs with MEAN_BEP and CV_BEP

for 8-PSK















The suggested MCS in LA mode for uplink EIT TBFs depending on the valuesof MEAN_BEP and CV_BEP for GMSK is shown in Table 22 on page 41.

Table 22 Suggested MCS in LA Mode for Uplink EIT TBFs with MEAN_BEP and CV_BEPfor GMSK

CV_BEP

0 1 2 3 4 5 6 7

MEAN_BEP













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Table 22 Suggested MCS in LA Mode for Uplink EIT TBFs with MEAN_BEP and CV_BEP

for GMSK




















The penalty table for downlink TBFs in LA/IR-BLER mode is shown in Table 23on page 42.

Table 23 Penalty Table for Downlink TBFs in LA/IR-BLER Mode

Current MCS

1 2 3 4 5 6 7 8 9

BLER (%)

0 2 2 2 2 2 2 2 2 0

1 2 2 2 2 2 2 2 2 0

2 2 2 2 2 2 2 2 2 0

3 1 1 1 1 1 1 1 1 0

4 1 1 1 1 1 1 1 1 0

5 1 1 1 1 1 1 1 1 0

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6 1 1 1 1 1 1 1 0 0

7 1 1 1 1 1 1 1 0 0

8 1 1 1 1 1 1 1 0 0

9 1 1 1 1 1 1 1 0 0

10 1 1 1 1 1 1 1 0 0

11 1 1 1 1 1 1 1 0 0

12 1 1 1 1 1 1 1 0 0

13 1 1 1 1 1 1 1 0 0

14 1 1 1 1 1 1 1 0 -115 1 1 1 0 1 1 1 0 -1

16 1 1 1 0 1 1 1 0 -1

17 1 1 1 0 1 1 1 0 -1

18 1 1 1 0 1 1 1 0 -1

19 1 1 1 0 1 1 1 0 -1

20 1 1 0 0 1 1 1 0 -1

21 1 1 0 0 1 1 1 0 -1

22 1 1 0 -1 1 1 1 0 -1

23 1 1 0 -1 1 1 1 0 -124 0 0 0 -1 1 1 1 0 -1

25 0 0 0 -1 1 1 1 0 -1

26 0 0 0 -1 1 1 1 0 -1

27 0 0 0 -1 1 1 1 0 -1

28 0 0 0 -1 1 1 1 0 -1

29 0 0 0 -1 1 1 1 0 -1

30 0 0 0 -1 1 1 1 0 -1

31 0 0 0 -1 1 1 1 0 -1

32 0 0 0 -1 1 1 1 0 -1

33 0 0 0 -1 1 1 1 0 -1

34 0 0 0 -1 1 1 1 0 -1

35 0 -1 -1 -1 1 0 0 0 -1

36 0 -1 -1 -1 1 0 0 0 -1

37 0 -1 -1 -1 1 0 0 0 -1

38 0 -1 -1 -1 1 0 0 0 -1

39 0 -1 -1 -1 1 0 0 0 -1

40 0 -1 -1 -1 0 0 0 -1 -1

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41 0 -1 -1 -1 0 0 0 -1 -1

42 0 -1 -1 -1 0 0 0 -1 -1

43 0 -1 -1 -1 0 0 0 -1 -1

44 0 -1 -1 -1 0 0 0 -1 -1

45 0 -1 -1 -1 0 -1 0 -1 -1

46 0 -1 -1 -1 0 -1 0 -1 -1

47 0 -1 -1 -1 0 -1 0 -1 -1

48 0 -1 -1 -1 0 -1 0 -1 -1

49 0 -1 -1 -1 0 -1 -1 -1 -1

50 0 -2 -2 -2 -1 -1 -1 -1 -2

51 0 -2 -2 -2 -1 -1 -1 -1 -2

52 0 -2 -2 -2 -1 -1 -1 -1 -2

53 0 -2 -2 -2 -1 -1 -1 -1 -2

54 0 -2 -2 -2 -1 -1 -1 -1 -2

55 0 -2 -2 -2 -1 -1 -1 -1 -2

56 0 -2 -2 -2 -1 -1 -1 -1 -2

57 0 -2 -2 -2 -1 -1 -1 -1 -2

58 0 -2 -2 -2 -1 -1 -1 -1 -259 0 -2 -2 -2 -1 -1 -1 -2 -2

60 0 -2 -2 -2 -1 -1 -1 -2 -2

61 0 -2 -2 -2 -1 -2 -1 -2 -2

62 0 -2 -2 -2 -1 -2 -1 -2 -2

63 0 -2 -2 -2 -1 -2 -1 -2 -2

64 0 -2 -2 -2 -1 -2 -2 -2 -2

65 0 -2 -2 -2 -1 -2 -2 -2 -2

66 0 -2 -2 -2 -2 -2 -2 -2 -2

67 0 -2 -2 -2 -2 -2 -2 -2 -2

68 0 -2 -2 -2 -2 -2 -2 -2 -2

69 0 -2 -2 -2 -2 -2 -2 -2 -2

70 0 -2 -2 -2 -2 -2 -2 -2 -2

71 0 -2 -2 -2 -2 -2 -2 -2 -2

72 0 -2 -2 -2 -2 -2 -2 -2 -2

73 0 -2 -2 -2 -2 -2 -2 -2 -2

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74 0 -2 -2 -2 -2 -2 -2 -2 -2

>74 0 -3 -3 -3 -3 -3 -3 -3 -3

The penalty table for downlink EIT TBFs in LA/IR-BLER mode is shown inTable 24 on page 45.

Table 24 Penalty Table for Downlink EIT TBFs in LA/IR-BLER Mode

Current MCS

1 2 3 4 5 6 7 8 9

BLER (%)

0 1 1 1 1 1 1 1 1 1

1 0 0 0 0 0 0 0 0 0

2 0 0 0 0 0 0 0 0 0

3 0 0 0 0 0 0 0 0 0

4 -1 -1 -1 -1 -1 -1 -1 -1 -1

5 -1 -1 -1 -1 -1 -1 -1 -1 -1

6 -1 -1 -1 -1 -1 -1 -1 -1 -1

7 -2 -2 -2 -2 -2 -2 -2 -2 -2

8 -2 -2 -2 -2 -2 -2 -2 -2 -2

9 -2 -2 -2 -2 -2 -2 -2 -2 -2

10 -4 -4 -4 -4 -4 -4 -4 -4 -4

11 -4 -4 -4 -4 -4 -4 -4 -4 -4

12 -4 -4 -4 -4 -4 -4 -4 -4 -4

13 -4 -4 -4 -4 -4 -4 -4 -4 -4

14 -4 -4 -4 -4 -4 -4 -4 -4 -4

15 -4 -4 -4 -4 -4 -4 -4 -4 -4

16 -4 -4 -4 -4 -4 -4 -4 -4 -4

17 -4 -4 -4 -4 -4 -4 -4 -4 -4

18 -4 -4 -4 -4 -4 -4 -4 -4 -4

19 -4 -4 -4 -4 -4 -4 -4 -4 -4

20 -4 -4 -4 -4 -4 -4 -4 -4 -4

21 -4 -4 -4 -4 -4 -4 -4 -4 -4

22 -6 -6 -6 -6 -6 -6 -6 -6 -6

23 -6 -6 -6 -6 -6 -6 -6 -6 -6

24 -6 -6 -6 -6 -6 -6 -6 -6 -6

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Table 24 Penalty Table for Downlink EIT TBFs in LA/IR-BLER Mode

25 -6 -6 -6 -6 -6 -6 -6 -6 -6

26 -6 -6 -6 -6 -6 -6 -6 -6 -6

27 -6 -6 -6 -6 -6 -6 -6 -6 -6

28 -6 -6 -6 -6 -6 -6 -6 -6 -6

29 -6 -6 -6 -6 -6 -6 -6 -6 -6

30 -6 -6 -6 -6 -6 -6 -6 -6 -6

31 -6 -6 -6 -6 -6 -6 -6 -6 -6

32 -6 -6 -6 -6 -6 -6 -6 -6 -6

33 -6 -6 -6 -6 -6 -6 -6 -6 -6

34 -6 -6 -6 -6 -6 -6 -6 -6 -6

35 -6 -6 -6 -6 -6 -6 -6 -6 -6

36 -6 -6 -6 -6 -6 -6 -6 -6 -6

37 -6 -6 -6 -6 -6 -6 -6 -6 -6

38 -6 -6 -6 -6 -6 -6 -6 -6 -6

39 -6 -6 -6 -6 -6 -6 -6 -6 -6

40 -6 -6 -6 -6 -6 -6 -6 -6 -6

41 -6 -6 -6 -6 -6 -6 -6 -6 -6

42 -6 -6 -6 -6 -6 -6 -6 -6 -643 -6 -6 -6 -6 -6 -6 -6 -6 -6

44 -6 -6 -6 -6 -6 -6 -6 -6 -6

45 -6 -6 -6 -6 -6 -6 -6 -6 -6

46 -6 -6 -6 -6 -6 -6 -6 -6 -6

47 -6 -6 -6 -6 -6 -6 -6 -6 -6

48 -6 -6 -6 -6 -6 -6 -6 -6 -6

49 -6 -6 -6 -6 -6 -6 -6 -6 -6

>50 -8 -8 -8 -8 -8 -8 -8 -8 -8

The penalty table for uplink TBFs in LA/IR-BLER mode is shown in Table 25on page 46.

Table 25 Penalty Table for Uplink TBFs in LA/IR-BLER Mode

Current MCS

1 2 3 4 5 6 7 8 9

BLER (%)

0 2 2 2 2 2 2 2 2 0

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1 2 2 2 2 2 2 2 2 0

2 2 2 2 2 2 2 2 2 0

3 1 1 1 1 1 1 1 1 0

4 1 1 1 1 1 1 1 1 0

5 1 1 1 1 1 1 1 1 0

6 1 1 1 1 1 1 1 0 0

7 1 1 1 1 1 1 1 0 0

8 1 1 1 1 1 1 1 0 0

9 1 1 1 1 1 1 1 0 010 1 1 1 1 1 1 1 0 0

11 1 1 1 1 1 1 1 0 0

12 1 1 1 1 1 1 1 0 0

13 1 1 1 1 1 1 1 0 0

14 1 1 1 1 1 1 1 0 -1

15 1 1 1 0 1 1 1 0 -1

16 1 1 1 0 1 1 1 0 -1

17 1 1 1 0 1 1 1 0 -1

18 1 1 1 0 1 1 1 0 -119 1 1 1 0 1 1 1 0 -1

20 1 1 0 0 1 1 1 0 -1

21 1 1 0 0 1 1 1 0 -1

22 1 1 0 -1 1 1 1 0 -1

23 1 1 0 -1 1 1 1 0 -1

24 0 0 0 -1 1 1 1 0 -1

25 0 0 0 -1 1 1 1 0 -1

26 0 0 0 -1 1 1 1 0 -1

27 0 0 0 -1 1 1 1 0 -1

28 0 0 0 -1 1 1 1 0 -1

29 0 0 0 -1 1 1 1 0 -1

30 0 0 0 -1 1 1 1 0 -1

31 0 0 0 -1 1 1 1 0 -1

32 0 0 0 -1 1 1 1 0 -1

33 0 0 0 -1 1 1 1 0 -1

34 0 0 0 -1 1 1 1 0 -1

35 0 -1 -1 -1 1 0 0 0 -1

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36 0 -1 -1 -1 1 0 0 0 -1

37 0 -1 -1 -1 1 0 0 0 -1

38 0 -1 -1 -1 1 0 0 0 -1

39 0 -1 -1 -1 1 0 0 0 -1

40 0 -1 -1 -1 0 0 0 -1 -1

41 0 -1 -1 -1 0 0 0 -1 -1

42 0 -1 -1 -1 0 0 0 -1 -1

43 0 -1 -1 -1 0 0 0 -1 -1

44 0 -1 -1 -1 0 0 0 -1 -1

45 0 -1 -1 -1 0 -1 0 -1 -1

46 0 -1 -1 -1 0 -1 0 -1 -1

47 0 -1 -1 -1 0 -1 0 -1 -1

48 0 -1 -1 -1 0

e gprs link quality control

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