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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
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
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.
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
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
2 CS Conversational Unknown 56 DL/UL
3 CS Conversational Unknown 32 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
7 PS Conversational Unknown 32 DL/UL
8 PS Conversational Unknown 16 DL/UL
9 PS Conversational Unknown 8 DL/UL
10 PS Streaming Unknown 256 DL/UL
11 PS Streaming Unknown 144 DL/UL
12 PS Streaming Unknown 128 DL/UL
13 PS Streaming Unknown 64 DL/UL
14 PS Streaming Unknown 32 DL/UL
RAN Feature Description Chapter 40 Radio Bears
15 PS Streaming Unknown 16 DL/UL
16 PS Streaming Unknown 8 DL/UL
18 PS Interactive Unknown 2048 DL
19 PS Interactive Unknown 1536 DL
20 PS Interactive Unknown 1024 DL
21 PS Interactive Unknown 768 DL
22 PS Interactive Unknown 384 DL/UL
23 PS Interactive Unknown 256 DL/UL
24 PS Interactive Unknown 144 DL/UL
25 PS Interactive Unknown 128 DL/UL
26 PS Interactive Unknown 64 DL/UL
27 PS Interactive Unknown 32 DL/UL
28 PS Interactive Unknown 16 DL/UL
29 PS Interactive Unknown 8 DL/UL
30 PS Background Unknown 2048 DL
31 PS Background Unknown 1536 DL
32 PS Background Unknown 1024 DL
33 PS Background Unknown 768 DL
34 PS Background Unknown 384 DL/UL
35 PS Background Unknown 256 DL/UL
36 PS Background Unknown 144 DL/UL
37 PS Background Unknown 128 DL/UL
38 PS Background Unknown 64 DL/UL
39 PS Background Unknown 32 DL/UL
40 PS Background Unknown 16 DL/UL
41 PS Background Unknown 8 DL/UL
42 PS Background Unknown 0 DL/UL
RAN Feature Description Chapter 40 Radio Bears
43 PS Interactive Unknown 0 DL/UL
44 PS Interactive Unknown 3648 DL
45 PS Background Unknown 3648 DL
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
RAN Feature Description Chapter 40 Radio Bears
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.
RAN Feature Description Chapter 40 Radio Bears
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)
RAN Feature Description Chapter 40 Radio Bears
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
Optional/Mandatory Mandatory
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.
RAN Feature Description Chapter 40 Radio Bears
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
Optional/Mandatory Mandatory
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
Optional/Mandatory Mandatory
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.
RAN Feature Description Chapter 40 Radio Bears
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
Optional/Mandatory Mandatory
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
RAN Feature Description Chapter 40 Radio Bears
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).
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
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
D100, D250, D500, D750, D1000, D1250, D1500, D1750, D2000, D2500, D3000, D3500, D4000, D4500, D5000, D7500
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
Optional/Mandatory Mandatory
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
RAN Feature Description Chapter 40 Radio Bears
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)
Default Value Configured according to a specific service
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABRLC
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
RAN Feature Description Chapter 40 Radio Bears
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
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
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
Default Value Configured according to a specific service
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABRLC
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
RAN Feature Description Chapter 40 Radio Bears
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
Default Value Configured according to a specific service
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABRLC
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
MML Command ADD/MOD TYPRABRLC
Description:
It is a switch-type parameter.
For details, refer to the parameters related to timer based no explicit.
RAN Feature Description Chapter 40 Radio Bears
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
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABRLC
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
Optional/Mandatory Optional
MML Command ADD/MOD TYPRABRLC
Description:
It is a switch-type parameter.
For details, refer to the parameters related to timer based no explicit.
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
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.
D1, D8, D16, D32, D64, D128, D256, D512, D768, D1024, D1536, D2047, D2560, D3072, D3584, D4095
Physical Range & Unit
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
Default Value Configured according to a specific service
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABRLC
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
RAN Feature Description Chapter 40 Radio Bears
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
GUI Range TRUE, FALSE
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 (%)
Default Value Configured according to a specific service
Optional/Mandatory Mandatory
Mandatory
Optional Optional Optional
MML Command ADD/MOD TYPRABRLC
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.
RAN Feature Description Chapter 40 Radio Bears
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
Physical Range & Unit
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)
Default Value Configured according to a specific service
Optional/Mandatory Optional
MML Command ADD/MOD TYPRABRLC
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
RAN Feature Description Chapter 40 Radio Bears
Parameter Name Missing PDU indication
Status report prohibit timer
State report period transmission timer
Parameter ID MissingPDUInd
TimerStatusProhibit
TimerStatusPeriodic
GUI Range TRUE, FALSE
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)
Default Value Configured according to a specific service
Optional/Mandatory Mandatory Optional Optional
MML Command ADD/MOD TYPRABRLC
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
RAN Feature Description Chapter 40 Radio Bears
Parameter Name Reset timer duration Max resetting times
Parameter ID TimerRST MaxRST
GUI Range
D50, D100, D150, D200, D250, D300, D350, D400, D450, D500, D550, D600, D700, D800, D900, D1000
D1, D4, D6, D8, D12, D16, D24, D32
Physical Range & Unit
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
Default Value Configured according to a specific service
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABRLC
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
RAN Feature Description Chapter 40 Radio Bears
Parameter Name Deliver data by sequence order on RNC side
Parameter ID InSequenceDeliveryOrder
GUI Range TRUE, FALSE
Physical Range & Unit –
Default Value TRUE
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABRLC
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
2 56 TM FALSE FALSETIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING
D100
3 32 TM FALSE FALSETIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING
D100
4 28.8 TM FALSE FALSETIMER_BASED_WITHOUT_EXPLICIT_SIGNALLING
D100
5 57.6 TM FALSE FALSE
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
Table 40-4 Default RLC parameters for PS interactive and background services carried on DCH
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
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
AMRLCDISCARDMODENO_DISCARD
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
RAN Feature Description Chapter 40 Radio Bears
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
AMRLCDISCARDMODENO_DISCARD
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
RAN Feature Description Chapter 40 Radio Bears
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
RAN Feature Description Chapter 40 Radio Bears
6) Parameters
Parameter Name MAC-d Pdu size
Parameter ID MACDPDUSIZE
GUI Range 1–5000
Physical Range & Unit1–5000
Unit: bit
Default Value 336
Optional/Mandatory Mandatory
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
GUI Range TRUE, FALSE
Physical Range & Unit –
Default Value FALSE
Optional/Mandatory Mandatoty
MML Command ADD/MOD TYPRABMACHS
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.
RAN Feature Description Chapter 40 Radio Bears
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
Physical Range & Unit
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 –
Optional/Mandatory Optional
MML Command ADD/MOD TYPRABMACHS
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.
RAN Feature Description Chapter 40 Radio Bears
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
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABMACHS
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.
RAN Feature Description Chapter 40 Radio Bears
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
Optional/Mandatory Mandatory
MML Command ADD/MOD TYPRABMACHS
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.
RAN Feature Description Chapter 40 Radio Bears
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.
RAN Feature Description Chapter 40 Radio Bears
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”