40 radio bears

RAN Feature Description Chapter 40 Radio Bears

Chapter 40 Radio Bears

40.1 Summary of UpdateThis Section provides the update history of this manual and introduces the content of subsequent updates.

Manual Version Description

01(2006-9-30)Added section 40.6.3 V. Control of HS-DSCH Transmission and Reception. And modified the description of parameter MAC-hs T1 timer after translation.

02(2006-10-19)

Modified the traffic class from “Background” to “Interactive” in “table40-4 TRB specifications”.

Added “DL” in the paragraph of judging if the PS streaming carried on HSDPA in I.

Added “and UE” to support HSDPA judgment in I. Modified the syntax in I.

Modified “is higher” to “isn’t lower” when judging the BE or streaming bit rate to the threshold on HSDPA in I.

Added the parameter PS_STREAMING_ON_HSDPA_SWITCH

40.2 Introduction

40.2.1 Definition

Based on the transferred data, radio bears are of two types: Signaling Radio Bear (SRB) and Traffic Radio Bear (TRB).

40.2.2 Terms and Abbreviations

I. Terms

Term Description

RAB indexA number defined by the RNC for a traffic class supported by the RNC


RBInvolves the configuration of all channel resources that are utilized during data transfer in UTRAN

II. Abbreviations

Abbreviation Full Spelling

CCH Common Transport Channel

CS Circuit Switched

DCH Dedicated Transport Channel

PS Packet Switched

RAB Radio Access Bearer

RB Radio Bear

RLC Radio Link Control

SDU Service Data Unit

UTRAN Universal Terrestrial Radio Access Network

40.3 Availability

40.3.1 Network Element Required

Table 40-1 NEs required for RB

UE NodeB RNCMSC

ServerMGW SGSN GGSN HLR

√ √ √ – – – – –

Note:

–: not required

√: required


40.3.2 Software Releases

Table 40-2 RAN products and related versions

Product Version

RNC BSC6800 V100R005 and later releases

NodeB

DBS3000 V100R006 and later releases

BTS3812A V100R006 and later releases

BTS3812E V100R006 and later releases

40.4 Impact

40.4.1 On System Performance

None.

40.4.2 On Other Features

Before a service is mapped onto the correct RAB index, its maximum bit rate is negotiated with the Intelligent Access Control (ICAC) algorithm. The negotiated maximum bit rate is the desired value for the service to be set up.

40.5 RestrictionsNone.

40.6 Technical Description

40.6.1 Radio Bears Configuration Model

The configuration model for radio bears is shown in Figure 40-2.


RadioClass

RNC

GlobelParaClass

FRC.Class

DL BE traffic DCH decision threshold TYPRABRLC.Class

Explicit-ind slide RX window timing

UL BE traffic DCH decision threshold

DL BE traffic threshold on HSDPA

DL streaming threshold on HSDPA

PS_STREAMING_ON_HSDPA_SWITCH

RAB&SRB

Explicit-ind SDU discard timing

Explicit-ind MRW command max re-TXnumber

No-explicit-ind SDU discard

Discard PDU max TX

Discard slide RX window timing

Discard MRW command max re-TXnumber

No-Discard PDU max TX

TM-UM RLC discard mode selection

UL RLC segment indication

DL RLC segment indication

UM-TM RLC discard mode selection

TX window size

RX window size

Last TX PDU poll indication

Last re-TX PDU poll indication

PDU poll frequency

SDU poll frequency

Poll window

Poll prohibit timer

re-TX poll timer

Periodical poll interval

Missing PDU indication

Status report prohibit timer

State report period transmission timer

Reset timer duration

Max resetting times

Deliver data by sequence order on RNCside

TYPRABMACHS.Class

MAC-d Pdu size

MAC-hs Discard timer option

MAC-hs Discard timer

MAC-hs window size

MAC-hs T1 timer

Figure 40-2 Configuration model for radio bears

40.6.2 Service Specifications

Table 40-1 describes the SRB specifications supported by the Huawei RNC.

Table 40-1 SRB specifications

SRB Index Signaling Rate (kbps) Direction

2 3.4 DL/UL


3 13.6 DL/UL

Table 40-2 describes the TRB specifications supported by the Huawei RNC. TRBs are mapped onto RAB indexes according to the attributes such as CN domain, traffic class, source statistics descriptor, maximum bit rate. After the mapping, the parameters are configured for each service on the basis of RAB index.

The RNC automatically checks the identity of the CN domain from which the services come. The signaling of RAB ASSIGNMENT REQUEST from the CN contains the traffic class, source statistics descriptor, and max bit rate. After the transport channel type selection in section 40.6.3 “Transport Channel Selection”, the max bit rate is determined through the negotiation with the ICAC algorithm. For details, refer to the section titled Rate Negotiation in the load control feature.

Table 40-2 TRB specifications

RAB IndexCN

DomainTraffic Class

Source Statistics

Descriptor

Maximum Bit Rate (kbit/s)

Direction

0 CS Conversational Speech 12.2 DL/UL

1 CS Conversational Unknown 64 DL/UL



4 CS Conversational Unknown 28.8 DL/UL

5 CS Streaming Unknown 57.6 DL/UL

6 PS Conversational Unknown 64 DL/UL




10 PS Streaming Unknown 256 DL/UL








18 PS Interactive Unknown 2048 DL




22 PS Interactive Unknown 384 DL/UL








30 PS Background Unknown 2048 DL




34 PS Background Unknown 384 DL/UL













The NodeB of V100R007 does not support multi-code operations on the UL and DL dedicated physical channels. In the uplink, the maximum bit rate of the services must not be higher than 384 kbps. In the downlink, the services with the maximum bit rate higher than 384 kbps are carried on HS-PDSCH.

Table 40-3 describes the specifications for combined services.

Table 40-3 Specifications for combined services

Index Type of Combined Service

0 Sig 3.4 kbit/s

1 Sig 13.6 kbit/s

2 Sig 3.4 kbit/s + CS service

3 Sig 3.4 kbit/s + PS service

4 Sig 3.4 kbit/s + PS service + PS service

5 Sig 3.4 kbit/s + PS service + PS service + PS service (carrying IMS sig)

6 Sig 3.4 kbit/s + CS service + PS service

7 Sig 3.4 kbit/s + CS service + PS service + PS service

8Sig 3.4 kbit/s+ CS service + PS service + PS service + PS service (carrying IMS sig)

9 Sig 3.4 kbit/s + CS service + CS service

10 Sig 3.4 kbit/s + CS service + CS service + PS service

40.6.3 Transport Channel Selection

I. Mapping of Signaling and Traffic onto Transport Channel

Table 40-4 describes the mapping of signaling and traffic onto transport channel.

Table 40-4 Mapping of signaling and traffic onto transport channel

CN Domain Traffic Class Transport Channel

Signaling – DCH/CCH


CSConversational

DCHStreaming

PS

Conversational DCH

Streaming DCH/HS-DSCH

InteractiveDCH/CCH / HS-DSCH

Background

When the RRC connection is set up, standalone signaling is carried on the DCH or the CCH, depending on the importance of the cause for RRC connection request.

Services in the CS domain and the conversational services in the PS domain have high transmission quality requirements. They are always mapped onto DCHs.

During setup, the interactive and background services in the PS domain can be mapped onto DCH or CCH. The data sent by low rate PS services is a relatively small amount, they can be carried on CCH to save radio resources. The transport channels for interactive and background services in the PS domain are selected according to the maximum bit rates requested by the services. In this situation, the following conditions must be met.

If DL maximum bit rate is lower than DL BE traffic DCH decision threshold and if UL maximum bit rate is lower than UL BE traffic DCH decision threshold, the service is set up on CCH, or else the serviced is set up on DCH.

Resources can be shared on HS-DSCH, which improves the utilization rate of system resources. Streaming, interactive, and background services in the PS domain can be carried on HS-DSCH.

When the requested DL maximum bit rate isn’t lower than DL BE traffic threshold on HSDPA and the cell and UE supports HSDPA, the interactive or background service is carried on HS-DSCH. Otherwise, the service is carried on DCH.

When the requested DL maximum bit rate isn’t lower than DL streaming threshold on HSDPA, the cell and UE supports HSDPA, and the PS_STREAMING_ON_HSDPA_SWITCH parameter is used, the streaming service is carried on HS-DSCH. Otherwise, the service is carried on DCH.


II. Mapping of Combined Servcie onto Transport Channel

The combined services are mapped onto and carried by their respective transport channels when the above conditions are met. If the interactive service or the background service in the PS domain is mapped onto CCH, it is carried on the CCH only when all services are carried on CCH. Otherwise, the interactive service or the background service is carried on DCH.

Assume that the related parameters are configured as follows:

DL BE traffic DCH decision threshold = 16 kbps, UL BE traffic DCH decision threshold = 16 kbps, DL BE traffic threshold on HSDPA = 32 kbps, PS_STREAMING_ON_HSDPA_SWITCH = 1, DL streaming threshold on HSDPA = 128 kbps

Traffic Combination Transport Channel Selection

Sig 3.4 kbit/s + CS + PS interactive 8 kbit/s

DCH (sig) + DCH (CS) + DCH (PS interactive 8 kbit/s)

Sig 3.4 kbit/s + PS interactive 8 kbit/s + PS interactive 64 kbit/s

DCH (sig) + DCH (PS interactive 8 kbit/s) + HS-DSCH (PS interactive 64 kbit/s)

Sig 3.4 kbit/s + PS interactive 8 kbit/s + PS interactive 8 kbit/s

CCH (sig) + CCH (PS interactive 8 kbit/s) + CCH (PS interactive 8 kbit/s)

Sig 3.4 kbit/s + PS interactive 64 kbit/s + PS streaming 128 kbit/s

DCH (sig) + HS-DSCH (PS interactive 64 kbit/s) + HS-DSCH (PS streaming 128 kbit/s)


III. Parameters

Parameter Name DL BE traffic DCH decision threshold

Parameter ID DlBeTraffDecThs

GUI Range D8, D16

Physical Range & Unit 8, 16 (kbit/s)

Default Value D8

Optional/Mandatory Mandatory

MML Command SET FRC

Description:

The default rate decision threshold of the DL PS background or interactive service to be carried on DCH. If the FRC parameters of the best cell cannot be obtained, this default value will be used. When the DL service rate is greater than or equal to this threshold, the service will be set up on DCH; otherwise, on CCH.

Parameter Name UL BE traffic DCH decision threshold

Parameter ID UlBeTraffDecThs

GUI Range D8, D16

Physical Range & Unit 8, 16 (kbit/s)

Default Value D8


MML Command SET FRC

Description:

The default rate decision threshold of the UL PS background or interactive service to be carried on DCH. If the FRC parameters of the best cell cannot be obtained, this default value will be used. When the UL service rate is greater than or equal to this threshold, the service will be set up on DCH; otherwise, on CCH.


Parameter Name DL BE traffic threshold on HSDPA

Parameter ID DlBeTraffThsOnHsdpa

GUI Range D8, D16, D32, D64, D128, D144, D256, D384, D768, D1024, D1536, D2048

Physical Range & Unit 8, 16, 32, 64, 128, 144, 256, 384, 768, 1024, 1536, 2048 (kbit/s)

Default Value D8


MML Command SET FRC

Description:

The rate decision threshold of the DL PS background or interactive service to be carried on HS-DSCH. When the maximum DL service rate is greater than or equal to this threshold, the service will be carried on HS-DSCH; otherwise, on DCH.

Parameter Name DL streaming threshold on HSDPA

Parameter ID DlStrThsonHsdpa

GUI Range D8, D16, D32, D64, D128, D144, D256

Physical Range & Unit 8, 16, 32, 64, 128, 144, 256 (kbit/s)

Default Value D128


MML Command SET FRC

Description:

The rate decision threshold of the DL PS streaming service to be carried on HS-DSCH. When the maximum DL service rate is greater than or equal to this threshold, the service will be carried on HS-DSCH; otherwise, on DCH.


Parameter Name PS_STREAMING_ON_HSDPA_SWITCH

Parameter ID PS_STREAMING_ON_HSDPA_SWITCH

GUI Range 0, 1

Physical Range & Unit Not checked, checked

Default Value 0


MML Command SET CORRMALGOSWITCH

Description:

When it is checked, the PS streaming service can be mapped onto HS-DSCH when the downlink max bit rate is more than or equal to the streaming on HSDPA threshold.

IV. Radio Link Control (RLC) Configuration

2) Features of RLC modes

The RLC sublayer consists of RLC entities, of which there are the following three types:

Acknowledged Mode (AM) Transparent Mode (TM) Unacknowledged Mode (UM)

Each RLC mode has its own impact on the correctness and delay of data transmission.

Table 40-1 describes the features of the three RLC modes.

Table 40-1 Features of the three RLC modes

Item TM UM AM

Head N YY (larger than UM head)

Cache N Y Y

Ciphering N Y Y

SDU size LimitInteger of predefined TB size

– –

Retransmission

N N Y


Feature

No additional delay

No overhead caused by a larger head

Not assured correctness

Low delay

Not assured correctness

Assured correctness

High delay

Overhead of RLC head reduces the transmission efficiency.

Applicable service

Services with strict delay requirement, such as CS conversational service

Services with the following features such as VoIP:

Low delay requirement

Insensitive to packet loss

Pending SDU size

Services (web browsing, FTP download) with the following features:

Not insensitive to delay

High or very high requirement for transmission quality

Data

Data

Data

UM head

AM head

TM PDU

UM PDU

AM PDU

Figure 40-2 PDUs of the three RLC modes

When RLC parameters are configured for different services, RLC modes are chosen on the basis of the QoS attributes (mainly delay and BER) of the services.

The TM mode is configured for a service with a strict delay requirement, a low BER, and a proper RLC SDU size.

The UM mode is configured for a service with a relatively high delay requirement, a low BER, and an RLC SDU size that is not desired by the TM.

The AM mode is configured in any other situation.3) RLC parameters

RLC parameters are of three types: discard parameter (applicable to TM, UM, and AM), TM parameter, and AM parameter (in UM mode RLC parameters only involve discard parameters).


Discard parameters

SDUs at the RLC sublayer are discarded in four ways: timer based explicit, timer based no explicit, max DAT retransmissions, and no discard.

Transmission RLC discard is mandatory for the AM mode, and it is optional for the TM and UM modes. In TM mode when the transmission RLC discard parameters are not configured, the RLC discards the SDUs that are received but not sent during the last TTI after receiving new SDUs. In UM mode when the transmission RLC discard parameters are not configured, all SDUs are reserved until the RLC entity is fully padded.

Parameters related to timer based explicit


Parameter Name Explicit-ind slide RX window timing

Explicit-ind SDU discard timing

Explicit-ind MRW command max re-TX number

Parameter ID ExplicitTimerMRWExplicitTimerDiscard

ExplicitMaxMRW

GUI Range

D50, D60, D70, D80, D90, D100, D120, D140, D160, D180, D200, D300, D400, D500, D700, D900


D1, D4, D6, D8, D12, D16, D24, D32

Physical Range & Unit

50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200, 300, 400, 500, 700, 900 (ms)

100, 250, 500, 750, 1000, 1250, 1500, 1750, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 7500 (ms)

1, 4, 6, 8, 12, 16, 24, 32

Default Value Configured according to a specific service


MML Command ADD/MOD TYPRABRLC

Description:

Used only when the RLC AM entity whose AM RLC discard mode selection is set to TIMER_BASED_WITH_EXPLICIT_SIGNALLING.

Every time the RLC receives an SDU from a higher layer, a Explicit-ind SDU discard timing timer is started. When the timers expires, the RLC discards the SDU, sends a PDU in MRW SUFI state to the recipient, and starts the Explicit-ind slide RX window timing timers. If no acknowledgement is received before the Explicit-ind slide RX window timing timer expires, the PDU is resent. If no acknowledgement is received when the PDU is resent for the number of times specified by EXPLICITMAXMRW, the RLC is reset.

Parameters related to timer based no explicit


Parameter Name No-explicit-ind SDU discard

Parameter ID NoExplicitTimerDiscard

GUI Range D10, D20, D30, D40, D50, D60, D70, D80, D90, D100

Physical Range & Unit 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 (ms)




Description:

Used only when the RLC UM or TM entity whose UM-TM RLC discard mode selection is set to TIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING. This timer indicates the maximum time of waiting for the acknowledgement of SDU that is sent from the upper layer and need be sent through RLC. If the RLC entity cannot send all the corresponding RLC PDUs of this SDU to the lower layer after the timer expires, this SDU will be discarded.

Parameters related to max DAT retransmissions


Parameter Name Discard PDU max TX

Discard slide RX window timing

Discard MRW command max re-TX number

Parameter ID MaxDAT TimerMRW MaxMRW

GUI Range

D2, D3, D4, D5, D6, D7, D8, D9, D10, D15, D20, D25, D30, D35, D40


D1, D4, D6, D8, D12, D16, D24, D32


1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40

50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200, 300, 400, 500, 700, 900 (ms)

1, 4, 6, 8, 12, 16, 24, 32




Description:

Used only when the RLC AM entity whose AM RLC discard mode selection is set to DISCARD_AFTER_MAX_DAT_RETRANSMISSIONS.

If the AMD PDU is not received after being sent for the number of times specified by the Discard PDU max TX parameter, the SDU contained in the PDU will be discarded. The command to move the receive window is sent to the recipient.

Parameters related to no discard


Parameter Name No-Discard PDU max TX

Parameter ID NoDiscardMaxDAT

GUI Range D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D15, D20, D25, D30, D35, D40

Physical Range & Unit 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40




Description:

Used only when the RLC AM entity whose AM RLC discard mode selection is set to NO_DISCARD. If the AMD PDU is not received after being sent for the number of times specified by Max_DAT, the RLC is reset.

TM Parameters

Parameter Name TM-UM RLC discard mode selection

Parameter ID UMTMRlcDiscardMode

GUI RangeNot used, TIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING

Physical Range & UnitNot used, TIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING

Default Value Not used

Optional/Mandatory Optional


Description:

It is a switch-type parameter.

For details, refer to the parameters related to timer based no explicit.


Parameter Name UL RLC segment indication

DL RLC segment indication

Parameter ID UlSegInd DlSegInd

GUI Range TRUE, FALSE

Physical Range & Unit TRUE, FALSE

Default Value FALSE



Description:

Used only for RLC TM mode. This parameter indicates whether to segment UL/DL RLC SDUs. TRUE: segment; FALSE: not segment. If it is set to TRUE, an SDU from the upper layer will be segmented when its size is greater than that of TMD PDU. In addition, all the PDUs belonging to an SDU must be sent out in a TTI. If this parameter is set to FALSE, an SDU is put into a PDU. Multiple SDUs can be sent out in a TTI, and all these PDUs must have the same length.

UM Parameters

Parameter Name UM-TM RLC discard mode selection

Parameter ID UMTMRlcDiscardMode

GUI RangeNot used, TIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING

Physical Range & UnitNot used, TIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING

Default Value Not used



Description:

It is a switch-type parameter.

For details, refer to the parameters related to timer based no explicit.


AM parameters

In RLC AM mode, the data is transferred as follows:

a) At the Sender, the upper layer data is sent to the RLC that buffers, segments, and cascades the data.

b) The Sender sends the data at the request of the MAC.

c) The receiver checks whether the received data is correct or not and returns the ACK or NACK message about each PDU.

d) Upon receipt of the NACK message, the Sender resends the PDU.

e) The receiver reassembles all the PDUs of an SDU after they are correctly received, and delivery the SDU to the higher layer.

AM parameters involve the following:

Transmit window and receive window Poll parameters at the Sender: trigger the receiver to send status reports. Status reporting parameters at the receiver: restrict or triggering the sending of

status reports. Discard parameters at the Sender: control the ways to discard RLC PDUs. Reset parameters Delivery order

The rules to configure AM parameters: Get status reports to be sent in time to trigger the RLC transmit window to slide, and prevent redundant retransmissions that are caused by too many status reports.

Transmit window and receive window


Parameter Name TX window size RX window size

Parameter ID TxWindowSize RxWindowSize

GUI Range

D1, D8, D16, D32, D64, D128, D256, D512, D768, D1024, D1536, D2047, D2560, D3072, D3584, D4095.



1, 8, 16, 32, 64, 128, 256, 512, 768, 1024, 1536, 2047, 2560, 3072, 3584, 4095

1, 8, 16, 32, 64, 128, 256, 512, 768, 1024, 1536, 2047, 2560, 3072, 3584, 4095




Description:

Used only for RLC AM entity.

TX window size indicates the maximum number of RLC PDUs the TX end can send when not receiving the acknowledgement from the peer end.

The size of this window is related to the throughput of RLC data. Usually, the greater the window size is, the higher the throughput and the more the system memory consumed.

RX window size indicates the maximum number of RLC PDUs that can be received in a continuous reception procedure. The RX window size and the TX window size need have the same size.

Poll parameters at the Sender


Parameter Name

Last TX PDU poll indication

Last re-TX PDU poll indication

PDU poll frequency

SDU poll frequency

Poll window

Parameter ID LastTxPDUPoll

LastReTxPDUPoll

PollPDU PollSDUPollWindow


TRUE, FALSE

D1, D2, D4, D8, D16, D32, D64, D128.

D1, D4, D16, D64.

D50, D60, D70, D80, D85, D90, D95, D99

Physical Range & Unit – –

1, 2, 4, 8, 16, 32, 64, 128

1, 4, 16, 64

50, 60, 70, 80, 85, 90, 95, 99 (%)



Mandatory

Optional Optional Optional


Description: Last TX PDU poll indication indicates whether to trigger polling when the PDU

sent by the TX end is the last one in the buffer.

Last re-TX PDU poll indication indicates whether to trigger polling when the PDU sent by the TX end is the last one in the retransmission buffer.

PDU poll frequency is the number of PDUs that the TX end sends before polling the RX end.

SDU poll frequency is the number of SDUs that the TX end sends before polling the RX end.

Poll window is the percent of the TX window that the time of PDU transmission uses before the TX end polls the RX end.


Parameter Name Poll prohibit timer

re-TX poll timer

Periodical poll interval

Parameter ID TimerPollProhibit

TimerPollTimerPollPeriodic

GUI Range

D10–D550, step: 10; D600–D1000, step: 50

D10–D550, step: 10; D600–D1000, step: 50

D100, D200, D300, D400, D500, D750, D1000, D2000


10–550, step: 10; 600–1000, step: 50. (ms)

10–550, step: 10; 600–1000, step: 50 (ms)

100, 200, 300, 400, 500, 750, 1000, 2000 (ms)




Description: Poll prohibit timer: Minimum interval between two polling PDU transmissions

by the TX end of RLC AM entity. Set this parameter greater than the interval between sending a polling PDU and receiving a state report requested to send.

re-TX poll timer: Maximum time of waiting for the response from the peer end after the TX end sends a polling PDU. If the TX end does not receive the response after the timer expires, it resends the polling PDU and restarts this timer.

Periodical poll interval: Interval between two polling PDU transmissions by the TX end of RLC AM entity.

Status reporting parameters at the receiver


Parameter Name Missing PDU indication

Status report prohibit timer

State report period transmission timer

Parameter ID MissingPDUInd

TimerStatusProhibit

TimerStatusPeriodic


D10–D550, step: 10; D600–D1000, step: 50

D100, D200, D300, D400, D500, D750, D1000, D2000

Physical Range & Unit –

10–550, step: 10; 600–1000, step: 50 (ms)

100, 200, 300, 400, 500, 750, 1000, 2000 (ms)


Optional/Mandatory Mandatory Optional Optional


Description: Missing PDU indication indicating whether the RX end of RLC AM entity

sends a state report when it detects a lost PDU.

Status report prohibit timer is used to prevent the RX end of RLC AM entity from continuously sending state reports. Set this parameter greater than the interval between receiving a PDU requested to send and sending a state report.

State report period transmission timer interval between two polling PDU transmissions by the TX end of RLC AM entity.

Discard parameters at the TX end

Refer to the description of discard parameters.

Reset parameters


Parameter Name Reset timer duration Max resetting times

Parameter ID TimerRST MaxRST

GUI Range


D1, D4, D6, D8, D12, D16, D24, D32


50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 700, 800, 900, 1000 (ms)

1, 4, 6, 8, 12, 16, 24, 32




Description:

Used only for the TX end of RLC AM entity. Reset timer duration indicates the time of waiting for a RESET ACK PDU after sending a RESET message to the peer end. Reset timer duration is used to avoid link block due to interference and test the loss of RESET ACK PDUs from the peer end.

If the RESET ACK PDU message is not received before the Reset timer duration parameter times out, the TX end resends the message. If the message is not received for the times specified by the Max resetting times parameter, the radio link is broken.

Delivery order


Parameter Name Deliver data by sequence order on RNC side

Parameter ID InSequenceDeliveryOrder



Default Value TRUE



Description:

Deliver data to upper layer by sequence order on RNC side.

4) Default RLC parameters for different services

Table 40-1 Default RLC parameters for CS services

RABIndex

MAXBITRATE (kbps)

RLCMOD

E

ULSEGIND

DLSEGIND

DISCARDMODENOEXPLICITTIMERDIS

CARD

0 12.2 TM FALSE FALSE

1 64 TM FALSE FALSETIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING

D100


D100


D100

4 28.8 TM FALSE FALSETIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING

D100

5 57.6 TM FALSE FALSE


Table 40-2 Default RLC parameters for PS conversational service

RABIndex MAXBITRATE (ms) RLCMODEUM-TM RLC discard mode

selection

6 64 UM Not used

7 32 UM Not used

8 16 UM Not used

9 8 UM Not used


Table 40-3 Default RLC parameters for PS streaming service

RABIndex 10 11 12 13 14 15 16

TRAFFICCLASS str str str str str str str

MAXBITRATE (kbps) 256 144 128 64 32 16 8

RLCMODE AM AM AM AM AM AM AM

AMRLCDISCARDMODE NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NODISCARDMAXDAT D10 D10 D10 D10 D10 D10 D10

TXWINDOWSIZE D768 D512 D512 D256 D128 D64 D32

TXWINDOWSIZELIMIT D512 D256 D256 D128 D64 D32 D16

TIMERRST D150 D150 D150 D150 D150 D150 D150

MAXRST D32 D32 D32 D32 D32 D32 D32

INSEQUENCEDELIVERYORDER TRUE TRUE TRUE TRUE TRUE TRUE TRUE

RXWINDOWSIZE D768 D512 D512 D256 D128 D64 D32

RXWINDOWSIZELIMIT D512 D256 D256 D128 D64 D32 D16

MISSINGPDUIND TRUE TRUE TRUE TRUE TRUE TRUE TRUE

TIMERSTATUSPROHIBIT D180 D180 D180 D200 D240 D240 D240

LASTTXPDUPOLL TRUE TRUE TRUE TRUE TRUE TRUE TRUE

LASTRETXPDUPOLL TRUE TRUE TRUE TRUE TRUE TRUE TRUE

TIMERPOLLPROHIBIT D100 D100 D100 D100 D100 D100 D100

TIMERPOLL D200 D270 D270 D270 D270 D270 D270

POLLPDU D32 D16 D16 D16 D16 D16 D16

POLLSDU D1 D1 D1 D1 D1 D1 D1

POLLWINDOW D50 D50 D50 D50 D50 D50 D50


Table 40-4 Default RLC parameters for PS interactive and background services carried on DCH


RABIndex 22/3423/35

24/36

25/37

26/38

27/39

28/40

29/41

42/43

TRAFFICCLASS I/B I/B I/B I/B I/B I/B I/B I/B I/B

MAXBITRATE (kbps) 384 256 144 128 64 32 16 8 0

RLCMODE AM AM AM AM AM AM AM AM AM

AMRLCDISCARDMODENO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NODISCARDMAXDAT D20 D20 D20 D20 D20 D20 D20 D20 D20

TXWINDOWSIZE D1024

D768

D512

D512

D256

D128

D64 D32 D32

TXWINDOWSIZELIMIT D512D512

D256

D256

D128

D64 D32 D16 D16

TIMERRST D150D150

D150

D150

D150

D150

D150

D150

D150

MAXRST D32 D32 D32 D32 D32 D32 D32 D32 D32

INSEQUENCEDELIVERYORDER

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

RXWINDOWSIZE D1024

D768

D512

D512

D256

D128

D64 D32 D32

RXWINDOWSIZELIMIT D512D512

D256

D256

D128

D64 D32 D16 D16

MISSINGPDUIND TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TIMERSTATUSPROHIBIT D120D130

D180

D180

D200

D200

D200

D240

D240

LASTTXPDUPOLL TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

LASTRETXPDUPOLL TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE


TIMERPOLLPROHIBIT D100D100

D100

D100

D100

D100

D100

D100

D100

TIMERPOLL D200D200

D270

D270

D270

D270

D270

D300

D300

POLLPDU D32 D32 D16 D16 D16 D8 D4 D2 D2

POLLSDU D1 D1 D1 D1 D1 D1 D1 D1

POLLWINDOW D50 D50 D50 D50 D50 D50 D50 D50


Table 40-5 Default RLC parameters for PS interactive and background services carried on HS-DSCH -1

RABIndex 23/35 24/3625/37

26/38

27/39

28/40

29/41

42/43

MAXBITRATE (kbps) 256 144 128 64 32 16 8 0

RLCMODE AM AM AM AM AM AM AM AM


NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NODISCARDMAXDAT D20 D20 D20 D20 D20 D20 D20 D20

TXWINDOWSIZE D768 D512 D512 D256 D256 D256 D256 D256

TXWINDOWSIZELIMIT D1 D1 D1 D1 D1 D1 D1 D1

TIMERRST D450 D450 D450 D450 D450 D450 D450 D450

MAXRST D32 D32 D32 D32 D32 D32 D32 D32

INSEQUENCEDELIVERYORDER TRUE TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

RXWINDOWSIZE D768 D512 D512 D256 D256 D256 D256 D256

RXWINDOWSIZELIMIT D1 D1 D1 D1 D1 D1 D1 D1

MISSINGPDUIND TRUE TRUETRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TIMERSTATUSPROHIBIT D120 D120 D120 D120 D120 D120 D120 D120

LASTTXPDUPOLL TRUE TRUETRUE

TRUE

TRUE

TRUE

TRUE

TRUE

LASTRETXPDUPOLL TRUE TRUETRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TIMERPOLLPROHIBIT D20 D20 D20 D20 D20 D20 D20 D20

TIMERPOLL D250 D250 D250 D250 D250 D250 D250 D250

POLLPDU D64 D64 D64 D64 D64 D64 D64 D64


Table 40-6 Default RLC parameters for PS interactive and background services carried on HS-DSCH -2

RABIndex 44/45

18/30

19/31

20/32

21/33

22/34

MAXBITRATE (kbps) 3648 2048 1536 1024 768 384

RLCMODE AM AM AM AM AM AM


NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NO_DISCARD

NODISCARDMAXDAT D20 D20 D20 D20 D20 D20

TXWINDOWSIZE D2047

D2047

D1024

D1024

D1024

D1024

TXWINDOWSIZELIMIT D1 D1 D1 D1 D1 D1

TIMERRST D450 D450 D450 D450 D450 D450

MAXRST D32 D32 D32 D32 D32 D32

INSEQUENCEDELIVERYORDER

TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

RXWINDOWSIZE D2047

D2047

D1024

D1024

D1024

D1024

RXWINDOWSIZELIMIT D1 D1 D1 D1 D1 D1

MISSINGPDUIND TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TIMERSTATUSPROHIBIT D80 D120 D120 D120 D120 D120

LASTTXPDUPOLL TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

LASTRETXPDUPOLL TRUE

TRUE

TRUE

TRUE

TRUE

TRUE

TIMERPOLLPROHIBIT D20 D20 D20 D20 D20 D20

TIMERPOLL D250 D250 D250 D250 D250 D250

POLLPDU D64 D64 D64 D64 D64 D64


V. Control of HS-DSCH Transmission and Reception

5) Introduction to data transmission on HS-DSCH

If services are mapped onto HS-DSCH, the service data reaches the MAC-d entity after being processed by RLC. The entity adds an MAC header to the RLC PDU to make an MAC-d PDU whose size is defined by MAC-d PDU size. The entity then assembles MAC-d PDUs with the same MAC-d flow ID and CmCH-PI into the same HS-DSCH data frame, and sends them to the MAC-hs entity on the NodeB. The PDUs are buffered in the corresponding queue and wait for sending.

An MAC-d PDU buffered in the NodeB MAC-hs queue can be discarded if the MAC-hs Discard timer option parameter is set to TRUE. If the discard option is turned on, the MAC-hs Discard timer parameter is started when each MAC-d PDU reaches the MAC-hs queue. If the MAC-d PDU is not sent before the MAC-hs Discard timer exceeds the specified time, it is discarded after the timeout. The discard option is turned on to prevent timed out MAC-d PDUs from congesting the queue and to reduce the delay of a subsequent MAC-d PDU.

The MAC-hs entity on the UE side has a reordering entity that reorders MAC-hs PDUs in disorder. The reordered PDUs are transferred to the higher layer in sequence.

For the reordering entity, the UE maintains a receive window. The receive window defines Transmission Sequence Numbers (TSNs) of those MAC-hs PDUs that can be received in the receiver without causing an advancement of the receive window. The size of the receive window equals MAC-hs window size and spans TSNs going from RcvWindow_UpperEdge –MAC-hs window size + 1 to RcvWindow_UpperEdge included.

The RcvWindow_UpperEdge represents the TSN, which is at the upper edge of the receive window. After the first MAC-hs PDU has been received successfully, it also corresponds to the MAC-hs PDU with the highest TSN of all received MAC-hs PDUs.

It is likely that an MAC-hs PDU at the transmitting end may be retransmitted and that PDUs with larger TSNs might be correctly received before the reception of those with smaller TSNs. In this situation, a PDU with a larger TSN is buffered in the reordering entity and wait for PDUs with smaller TSNs to be sent, the MAC-hs T1 timer parameter is started for the PDU, and the TSN of the PDU is recorded as T1_TSN. If MAC-hs PDUs with TSNs that are smaller than T1_TSN are not corrected received yet when MAC-hs T1 timer exceeds the time, the following PDUs are sent to the disassembly entity and then the TSN range and T1_TSN of the receive window are updated:

all correctly received MAC-hs PDUs with TSN up to and including T1_TSN all correctly received MAC-hs PDUs up to the next not received MAC-hs PDU

After the above actions, the PDUs that meet the following requirement is not waited:

TSN < RcvWindow_UpperEdge – MAC-hs window size + 1


6) Parameters

Parameter Name MAC-d Pdu size

Parameter ID MACDPDUSIZE

GUI Range 1–5000

Physical Range & Unit1–5000

Unit: bit

Default Value 336


MML Command ADD/MOD TYPRABMACHS

Description:

Size of a MAC-d PDU, that is, number of bits contained in a MAC-d PDU.

Parameter Name MAC-hs Discard timer option

Parameter ID MACHSDISCARDTIMEOPT



Default Value FALSE

Optional/Mandatory Mandatoty


Description:

Indication of whether to configure the MAC-hs discard timer.

TRUE: to configure the MAC-hs discard timer on the NodeB side.

FALSE: not to configure the MAC-hs discard timer on the NodeB side.


Parameter Name MAC-hs Discard timer

Parameter ID MACHSDISCARDTIME

GUI Range

D20, D40, D60, D80, D100, D120, D140, D160, D180, D200, D250, D300, D400, D500, D750, D1000, D1250, D1500, D1750, D2000, D2500, D3000, D3500, D4000, D4500, D5000, D7500


20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 250, 300, 400, 500, 750, 1000, 1250, 1500, 1750, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 7500, Unit:ms

Default Value –



Description:

When the timer expires, MAC-d PDUs received before the timer starts in the queue are discarded.

It needs to be configured only when MACHSDISCARDTIMEOPT is TRUE.


Parameter Name MAC-hs window size

Parameter ID MACHSWINSIZE

GUI Range D4, D6, D8, D12, D16, D24, D32

Physical Range & Unit4, 6, 8, 12, 16, 24, 32

Unit: non

Default Value D16



Description:

Indication of the scope of MAC-hs PDUs waiting for reordering on the UE side .This parameter is limited by the data transmission delay and buffer size.

- If the value is too large, the number of MAC-hs PDU stored in the receive window waiting for the previous lost MAC-hs PDU will increase, i.e. the delay will increase.

- If the value is too small, the MAC-hs PDUs not received correctly in time will be discarded in MAC-hs for the receive window moving. Those discarded MAC-hs PDUs will be retransmitted by RLC when RLC is AM.


Parameter Name MAC-hs T1 timer

Parameter ID MACHST1

GUI RangeD10, D20, D30, D40, D50, D60, D70, D80, D90, D100, D120, D140, D160, D200, D300, D400

Physical Range & Unit10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 140, 160, 200, 300, 400

Unit: ms

Default Value D60



Description:

This parameter define the timer length of MAC-hs PDUs received correctly by UE waiting for the MAC-hs PDUs transmitted before them to be received correctly. Set T1_TSN as the TSN(Transmisison Sequence Number) of the MAC-hs PDU corresponding to the MAC-hs T1 timer. When the timer times out, if there are some MAC-hs PDUs whose TSNs are smaller than T1_TSN not being received correctly yet, the corrected received MAC-hs PDUs with TSN up to and including T1_TSN or the corrected received MAC-hs PDUs with TSN from T1_TSN+1 up to the next not received MAC-hs PDU will be delivered to the disassembly entity, and UE won’t wait for the incorrect PDUs whose TSN are smaller than T1_TSN any more.

- If the value is too small, the retransmitting MAC-hs PDUs are easy to be discarded by UE.

- If the value is too large, the round trip delay of MAC-d PDUs will be too long when data loss occurs in MAC-hs. This may leads to unnecessary data retransmissions on the Radio Link Control (RLC) layer.

40.7 CapabilitiesWith the parameters of DL BE traffic DCH decision threshold, UL BE traffic DCH decision threshold, DL BE traffic threshold on HSDPA, PS_STREAMING_ON_HSDPA_SWITCH, and DL streaming threshold on HSDPA, all services can be mapped onto the proper transport channel; thus enhancing system capacity and ensures the QoS.


When cells support HSDPA, the PS interactive and background services are mapped onto the HS-DSCH to fully utilize the HS-DSCH that can be shared, to increase resource utilization rate, and to enhance user experience.

40.8 Implementation

40.8.1 Enabling Radio Bears

I. Hardware Installation

No additional hardware components are required.

II. Software Installation

The radio bears feature does not require additional software.

III. Data Configuration

7) Add the basic services that are supported by the RNC and allocate the RAB index by executing the command ADD TYPRABBASIC.

8) Add RLC parameters related to the RAB by executing the ADD TYPRABRLC command.

IV. Verification of the Enabled Feature

Execute the LST TYPRAB command. If the information about the type of service to be listed is available, this is an indication that the RAB is added.

40.8.2 Reconfigure Radio Bear Parameters

None.

40.8.3 Disabling the Radio Bears Feature

Execute the RMV TYPRABRLC command to remove all RLC parameters related to the RAB.

Execute the RMV TYPRAB command to remove all RAB related RLC parameters, power control parameters, and transport format parameters. After this, the RNC does not support the related services.

40.9 Maintenance Information

40.9.1 Alarms

None.


40.9.2 Counters

None.

40.10 References 3GPP TS 25.322, “Radio Link Control (RLC) protocol specification, V5.d.0” 3GPP TS 25.331,”Radio Resource Control (RRC), V5.h.0”

40 radio bears

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