3g rlc parameter retune
DESCRIPTION
3G RLC Parameter Retune wcdmaTRANSCRIPT
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CONTENT
N• RLC Simple Explanation
D• Parameter Reference
S• Sample Cases and Trial Result
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RLC SIMPLE EXPLANATION
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RLC Simple Concept(1)
RLC is in sublayer of layer 2 (Data Link Layer) in UMTS Protocol Stack. RLC Operate on logical and transport channels in both the control plane and the user plane . It Provides services to the RRC layer in the controlPlane and the application layer in user plane. Also RLC Supports three data transfer modes:- TM (Transparent Mode)- UM (Unacknowledged Mode)- AM Acknowledged Mode) Each mode performs some or all of the functions listed for RLC, depending on the requirements of the modePlease see next slide for detailing mode function
UMTS Protocol Stack
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RLC Simple Concept(2)
RLC Typical functions:- Segmentation, reassembly, concatenation and padding- Retransmission control, flow control- Duplicate detection, in sequence delivery- Error correction- Chipering
The primary function of RLC is to transfer user data and signaling between the upper layers and the MAC layers. Data is transferred into the RLC in data blocks called Service Data Units (SDU). Data is transferredOut of the RLC in data blocks called Protocol Data Units (PDU)
Three data transfer mode are defined:- TM (Transparent Mode)
- PDUs are transferred with no additional header information. - Use for “unreliable services”, separate between receive and transmit entities- Support a set of fixed length SDU sizes
- UM (Unacknowledged Mode) - A header containing length and sequence number fields are added to the PDU before it is transmitted.- Use for “unreliable services”, separate between receive and transmit entities- Support arbitrary (not fixed) SDU Sizes
- AM (Acknowledged Mode) - PDU’s are delivered according to a bidirectional protocol that includes in-sequence delivery, flow control, error detection, and duplicate detection.
- Use for “reliable services”, and bidirectional entities (not separate between transmit and receive)- Support arbitrary (not fixed) SDU Sizes
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RLC Simple Concept(3)
- Data flow to and from the upper layers are called Radio Bearers and may carry either signaling data (Signaling Radio Bearers) – SRB or user data (Radio Access Bearers) – RAB - Data flow to and from the MAC are called Logical Channels.
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RLC Parameters Introduction (1)
Most PS data service optimizations – either call or cell throughput involve RLC protocol parameters.Because PS Data services operate in AM, where errors are handled by retransmissions, RLC setting areEssential. RLC is a protocol in UMTS networks that allows a lost or erroneous packet to be retransmittedby the lower layer.Below are RLC most important parameter- PDU Discard Mode : Defines the behavior for unacknowledged PDUs- Max Dat : Maximum number of PDU retransmissions before a RLC Reset is triggered- Timer RST : Reset timer for RLC resets- Max RST : MaxRST defines the maximum number of RLC RESET PDUs retransmissions- Tx/Rx Window Size : Maximum allowed transmitter/ receiver window size- Timer Status Prohibit (TSP) : Minimum time between consecutive Status (ACK) reports- Timer Poll Prohibit : Minimum time between polls
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PARAMETER REFERENCENSN-ERICSSON-HUAWEI -QUALCOMM
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RLC Parameters MAXDAT QUALCOMM
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RLC Parameters MAXRST QUALCOMM
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RLC Parameters MAXDAT (1) - NSN
Parameter Name Abbreviated Name Parameter Group Description
AM RLC MaxDAT transmissions for PS NRT with DCH AMRLCOnDCHOfNRTPSMaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the PS interactive and background radio bearers when data is transferred with DCH. Value of the parameter defines the maximum number of transmissions for the AMD PDU, which is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC MaxDAT transmissions for SRB13.6 with DCH AMRLCOnDCHOfSRB136MaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the SRB 13.6 when the signalling is transferred over DCH. The value of the parameter defines the maximum number of transmissions for the AMD PDU that is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signaling.
AM RLC MaxDAT transtransmissions for SRB3.4 with DCH AMRLCOnDCHOfSRB34MaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the SRB 3.4 when the signalling is transferred over DCH. The value of the parameter defines the maximum number of transmissions for the AMD PDU that is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signaling.
AM RLC MaxDAT transmissions for PS streaming with DCH AMRLCOnDCHOfStreamMaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the PS streaming radio bearers when data is transferred with DCH. Value of the parameter defines the maximum number of transmissions for the AMD PDU, which is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC MaxDAT transmissions for PS NRT with E-DCH AMRLCOnEDCHOfNRTPSMaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the PS interactive and background radio bearers when data is transferred with E-DCH. Value of the parameter defines the maximum number of transmissions for the AMD PDU, which is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
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RLC Parameters MAXDAT (2)- NSN
Parameter Name Abbreviated Name Parameter Group Description
AM RLC MaxDAT transmissions for PS streaming E-DCH EDCHStrPSMaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the PS streaming radio bearers when data is transferred with E-DCH. Value of the parameter defines the maximum number of transmissions for the AMD PDU, which is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC MaxDAT transmissions for PS NRT with FACH/RACH AMRLCOnFACHOfPSMaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the PS interactive and background radio bearers when data is transferred over FACH/RACH. Value of the parameter defines the maximum number of transmissions for the AMD PDU, which is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC MaxDAT transmissions for SRB with FACH/RACH AMRLCOnFACHOfSRBMaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the SRB 13.6 when the signalling is transferred over FACH/RACH. The value of the parameter defines the maximum number of transmissions for the AMD PDU that is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signaling.
AM RLC MaxDAT transmissions for PS NRT with HS-DSCH
AMRLCOnHSDSCHOfNRTPSMaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the PS interactive and background radio bearers when data is transferred over HS-DSCH. Value of the parameter defines the maximum number of transmissions for the AMD PDU, which is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC MaxDAT transmissions for SRB on HSPA AMRLCSRBHSPAMaxDAT RNRLC
This parameter defines the value of the RLC protocol parameter MaxDAT for the AM RLC entity of the SRB on HSPA when the signalling is transferred over E-DCH or HS-DSCH. The value of the parameter defines the maximum number of transmissions for the AMD PDU that is set equal to the MaxDAT-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signaling.
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RLC Parameters MAXRST(1)- NSNParameter Name Abbreviated Name Parameter Group Description
AM RLC MaxRST transmissions for PS NRT with DCH AMRLCOnDCHOfNRTPSMaxRST RNRLC
The parameter defines the value of the RLC protocol parameter MaxRST for the AM RLC entity of the PS interactive and background radio bearers when data is transferred with DCH. The value of the parameter defines the maximum number of transmissions for the RLC RESET PDU, which is set equal to the MaxRST-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC MaxRST transmissions for PS streaming with DCH AMRLCOnDCHOfStreamMaxRST RNRLC
The parameter defines the value of the RLC protocol parameter MaxRST for the AM RLC entity of the PS streaming radio bearers when data is transferred with DCH. The value of the parameter defines the maximum number of transmissions for the RLC RESET PDU, which is set equal to the MaxRST-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC maxRST transmissions for PS NRT with E-DCH AMRLCOnEDCHOfNRTPSMaxRST RNRLC
The parameter defines the value of the RLC protocol parameter MaxRST for the AM RLC entity of the PS interactive and background radio bearers when data is transferred over E-DCH. The value of the parameter defines the maximum number of transmissions for the RLC RESET PDU, which is set equal to the MaxRST-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC maxRST transmissions for PS streaming E-DCH EDCHStrPSMaxRST RNRLC
The parameter defines the value of the RLC protocol parameter MaxRST for the AM RLC entity of the PS streaming radio bearers when data is transferred over E-DCH. The value of the parameter defines the maximum number of transmissions for the RLC RESET PDU, which is set equal to the MaxRST-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC MaxRST transmissions for PS NRT with FACH/RACH AMRLCOnFACHOfPSMaxRST RNRLC
The parameter defines the value of the RLC protocol parameter MaxRST for the AM RLC entity of the PS interactive and background radio bearers when data is transferred over FACH/RACH. The value of the parameter defines the maximum number of transmissions for the RLC RESET PDU, which is set equal to the MaxRST-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
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RLC Parameters MAXRST(2)- NSN
Parameter Name Abbreviated Name Parameter Group Description
AM RLC maxRST transmissions for PS NRT with HS-DSCHAMRLCOnHSDSCHOfNRTPSMaxRST RNRLC
The parameter defines the value of the RLC protocol parameter MaxRST for the AM RLC entity of the PS interactive and background radio bearers when data is transferred over HS-DSCH. The value of the parameter defines the maximum number of transmissions for the RLC RESET PDU, which is set equal to the MaxRST-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
AM RLC maxRST transmissions for PS stream with HS-DSCH HSDSCHStrPSMaxRST RNRLC
The parameter defines the value of the RLC protocol parameter MaxRST for the AM RLC entity of the PS streaming radio bearers when data is transferred over HS-DCH. The value of the parameter defines the maximum number of transmissions for the RLC RESET PDU, which is set equal to the MaxRST-1. The value of the parameter is configured as such to the RLC entity of the RNC and it is signalled to the RLC entity of the UE rounded up to the closest value or down to the maximum value allowed in the RRC signalling.
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RLC Parameters MAXDAT – MAXRST – ERICSSON
Class_MO Param_name Ericsson_Constant Range Default_value Parameter_Description
UeRcRb rncMaxDat YES
Determines the number of transmissions of a PDU before a SDU is discarded or reset procedure is initiated.The maximum number of transmissions of a PDU equals MaxDat-1.RLC info on RNC side. Valid only for RLC mode = AM.This attribute may only be changed by Ericsson personnel.
UeRcRbRlc rncMaxDat YES
Determines the number of transmissions of a PDU before a SDU is discarded or reset procedure is initiated.The maximum number of transmissions of a PDU equals MaxDat-1.This attribute may only be changed by Ericsson personnel.
UeRcRb rncMaxRst YES
Determines the maximum number of transmissions of a reset PDU.The maximum number of transmissions of a reset PDU equals MaxRst-1.RLC info on RNC side. Valid only for RLC mode = AM.This attribute may only be changed by Ericsson personnel.
UeRcRbRlc rncMaxRst YES
Determines the maximum number of transmissions of a reset PDU.The maximum number of transmissions of a reset PDU equals MaxRst-1.This attribute may only be changed by Ericsson personnel.
UeRcRb ueMaxDat YES
Determines the number of transmissions of a PDU before a SDU is discarded or reset procedure is initiated.The number of transmissions is equal to MaxDat - 1.RLC info on UE side UL. Valid only for RLC mode = AM.This attribute may only be changed by Ericsson personnel
UeRcRbRlc ueMaxDat YES
Determines the number of transmissions of a PDU before a SDU is discarded or reset procedure is initiated.The number of transmissions is equal to MaxDat - 1.This attribute may only be changed by Ericsson personnel.
UeRcRb ueMaxRst YES The maximum number of transmissions of reset PDU equals MaxRst-1.RLC info on UE side UL. This attribute may only be changed by Ericsson personnel.
UeRcRbRlc ueMaxRst YES The maximum number of transmissions of reset PDU equals MaxRst-1.This attribute may only be changed by Ericsson personnel.
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RLC Parameters MAXDAT HUAWEI
MO Parameter ID
Parameter Name Meaning Mandator
yFeature Name GUI Value Range Enumeration
Number/Bit Actual Value Range Default Value Recommended Value
UTYPRABRLC MaxDAT Discard PDU max TX
This parameter is applicable to only the AM RLC entity whose "AMRlcDiscardMode" is set to DISCARD_AFTER_MAX_DAT_RETRANSMISSIONS. This parameter specifies the maximum number of transmissions of a PDU before the TX end discards the corresponding SDU. When the TX end discards the SDU, it sends an MRW command to the RX end, indicating the discard, to update the RX window. For details of this parameter, refer to the 3GPP TS 25.322.
YES None
D2, D3, D4, D5, D6, D7, D8, D9, D10, D15, D20, D25, D30, D35, D40
D2~1, D3~2, D4~3, D5~4, D6~5, D7~6, D8~7, D9~8, D10~9, D15~10, D20~11, D25~12, D30~13, D35~14, D40~15
2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40
None None
UTYPSRBRLC MaxDAT Discard PDU max TX
This parameter is applicable to only the AM RLC entity whose "AMRlcDiscardMode" is set to DISCARD_AFTER_MAX_DAT_RETRANSMISSIONS. This parameter specifies the maximum number of transmissions of a PDU before the TX end discards the corresponding SDU. For details of this parameter, refer to the 3GPP TS 25.322.This parameter is an advanced parameter. To modify this parameter, contact Huawei Customer Service Center for technical support.
YESLogical Channel Management
D2, D3, D4, D5, D6, D7, D8, D9, D10, D15, D20, D25, D30, D35, D40
D2~1, D3~2, D4~3, D5~4, D6~5, D7~6, D8~7, D9~8, D10~9, D15~10, D20~11, D25~12, D30~13, D35~14, D40~15
2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40
None None
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RLC Parameters MAXRST – HUAWEI
MO Parameter ID
Parameter Name Meaning Mandato
ryFeature Name
GUI Value Range
Enumeration Number/Bit
Actual Value Range
Default Value
Recommended Value
UTYPRABRLC MaxRST Max resetting times
This parameter specifies the maximum number of transmissions of a RESET PDU. This parameter is used only at the TX end of the AM RLC entity. If the link communication quality is poor during the reset of the AM RLC entity, the TX end retransmits the RESET PDU because it does not receive the RESET ACK PDU from the peer end. When the number of retransmissions reaches the maximum value (Max_RST), the TX end reports an unrecoverable error to upper layers and stops retransmitting the PDU. For details of this parameter, refer to the 3GPP TS 25.322.
NO NoneD1, D4, D6, D8, D12, D16, D24, D32
D1~0, D4~1, D6~2, D8~3, D12~4, D16~5, D24~6, D32~7
1, 4, 6, 8, 12, 16, 24, 32 D32 D32
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SAMPLE CASES AND TRIAL RESULT
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SAMPLE CASE : QUALCOMM VIETNAM - VNPT
Qualcomm recommend VNPT to put Maximal Value
for MAXDAT (40) and MAXRST (32) to improve PS
Drop KPI
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SAMPLE CASE : HUAWEI INDONESIA OPERATOR A REGION J
PS RAB Drop Improve after retune “MAXDAT” to large
value
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TRIAL RESULT : NSN INDONESIA OPERATOR I REGION CJ - 1
PS Drop Call Improve after retune MAXDAT and MAXRST to large value, meanwhile PS Traffic still
maintain
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TRIAL RESULT : NSN INDONESIA OPERATOR I REGION CJ - 2
PS Drop Call Improve after retune MAXDAT and MAXRST to large value, meanwhile PS Traffic still
maintain
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REFERENCES
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REFERENCES
- NSN RU 30 Parameter references- HUAWEI RAN 14 Parameter references- Ericsson RNC Internal system value Parameter- Qualcomm – WCDMA (UMTS) Overview- Qualcomm – WCDMA UMTS Deployment Handbook Planning and Optimization Aspects, John Wiley- Qualcomm – VNPT Network Analysis Report – System Parameter Review
