lte signaling radio bearer

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Page 1: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

2.LTE Signaling Radio Bearer Overview

MobileComm Professionals, Inc Author : Ray KhasturTitle : LTE Optimization Consultant

Page 2: LTE Signaling Radio Bearer

Company Confidential - Pinnacle Learning Center

2.1 Bearer Overview

Page 3: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

What is Bearer ?

“Bearer” is the way how packet data transmitted from the UE until the Internet Cloud area. In another word Bearer is the pipeline that pass through the communication content which can be transform from one pipeline to another pipeline. As we can see on above picture that during the transmission of internet content via LTE Networks called as EPS Bearer (Evolved Packer System). Out side LTE environment called as External Bearer.

Page 4: LTE Signaling Radio Bearer

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Bearer Components

If you see the diagram shown above, you would notice that this bearer has two main part. One is 'Radio Bearer' and the other part is Core network bearer.In LTE, the both 'Radio Bearer' part and 'Core Network Bearer' both configured by a single message, 'RRC Connection Reconfiguration'. Actually within 'RRC Connection Reconfiguration' message there is one part for Radio configuration and another part for Core Network configuration.

Page 5: LTE Signaling Radio Bearer

Company Confidential - Pinnacle Learning Center

2.2 Type of Radio Bearer

Page 6: LTE Signaling Radio Bearer

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Type of EPS Bearer

i) Default EPS Bearer :Be established during Attach ProcessAllocate IP address to UEDoes not have specifc QoS (only Nominal QoS is applied).Similar to Primary PDP Context in UMTS

ii) Dedicated EPS BearerNormally be established during the call setup after idle mode. (but can be established during the attach as well).Does not allocate any additional IP address to UEIs linked to a specified default EPS bearerHave a specific (usually guaranteed) QoSSimilar to Secondary PDP Context in UMTS

Page 7: LTE Signaling Radio Bearer

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• SRB0 is for RRC messages using the CCCH logical channel;

• SRB1 is for RRC messages (which may include a piggybacked NAS

message) as well as for NAS messages prior to the establishment of

SRB2, all using DCCH logical channel;

• SRB2 is for RRC messages which include logged measurement

information as well as for NAS messages, all using DCCH logical

channel. SRB2 has a lower-priority than SRB1 and is always configured

by E-UTRAN after security activation.

Signaling Radio Bearer

Page 8: LTE Signaling Radio Bearer

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SRB Mapping

• MasterInformationBlock

– Signalling radio bearer:

N/A

– RLC-SAP: TM

– Logical channel: BCCH

– Direction: E-UTRAN to UE

• SystemInformationBlockType1

– Signalling radio bearer:

N/A

– RLC-SAP: TM

– Logical channel: BCCH

– Direction: E-UTRAN to UE

• RRCConnectionRequest

– Signalling radio bearer:

SRB0

– RLC-SAP: TM

– Logical channel: CCCH

– Direction: UE to E-UTRAN

• RRCConnectionSetup

– Signalling radio bearer:

SRB0

– RLC-SAP: TM

– Logical channel: CCCH

– Direction: E-UTRAN to UE

RRCConnectionSetupComplete

- Signalling radio bearer: SRB1

- RLC-SAP: AM

- Logical channel: DCCH

- Direction: UE to E-UTRAN

RRCConnectionReconfiguration

- Signalling radio bearer: SRB1

- RLC-SAP: AM

- Logical channel: DCCH

- Direction: E-UTRAN to UE

MeasurementReport

- Signalling radio bearer: SRB1

- RLC-SAP: AM

- Logical channel: DCCH

- Direction: UE to E-UTRAN

MobilityFromEUTRACommand

- Signalling radio bearer: SRB1

- RLC-SAP: AM

- Logical channel: DCCH

- Direction: E-UTRAN to UE

UECapabilityEnquiry

- Signalling radio bearer: SRB1

- RLC-SAP: AM

- Logical channel: DCCH

- Direction: E-UTRAN to UE

UEInformationRequest

- Signalling radio bearer: SRB1

- RLC-SAP: AM

- Logical channel: DCCH

- Direction: E-UTRAN to UE

DLInformationTransfer

- Signalling radio bearer: SRB2 or SRB1 (only if SRB2 not established yet. If SRB2 is suspended, E-UTRAN does not send this message until SRB2 is resumed.)

- RLC-SAP: AM

- Logical channel: DCCH

- Direction: E-UTRAN to UE

Paging

- Signalling radio bearer: N/A

- RLC-SAP: TM

- Logical channel: PCCH

- Direction: E-UTRAN to UE

The RLC (Radio Link Control) layer is responsible for delivery of upper layer SDUs. RLC can work in 3 different modes, depending on the requirement of the data to be transported; Transparent Mode (TM), Unacknowledged Mode (UM) and Acknowledged Mode (AM). AM has functions for retransmission of erroneous received PDUs. The RLC working in UM or AM also has functions for segmentation and concatenation of SDUs sent over the LTE air interface. For received PDUs RLC support functions for re-ordering, duplicate detection and reassembly

Page 9: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

Type of EPS Bearer Cont’d (Attach)

Default EPS Bearer Setup

Dedicated EPS Bearer Setup

This process happen mostly on the Smartphone as additional Bearer Setup after normal attach procedure perform

Page 10: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

Type of EPS Bearer Cont’d (Service Req)

Dedicated EPS Bearer Setup

This process happen after UE Entering RRC Idle State condition. When there are packets data need to be send to this UE. MME will performing Paging Activity to

search and waking up those UE to receive waiting packets data.

Page 11: LTE Signaling Radio Bearer

Company Confidential - Pinnacle Learning Center

2.3 Function of Radio Bearer

Page 12: LTE Signaling Radio Bearer

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Bearer Level QoS

Page 13: LTE Signaling Radio Bearer

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Bearer Level QoS

Default bearer 1: Used for signaling messages (sip signaling) related to IMS network. It uses qci 5

Dedicated bearer: Used for VoLTE VoIP traffic. It uses qci 1 and is linked to default bearer 1

Default bearer 2: Used for all other smartphone traffic (video, chat, email, browser etc), assuming qci 9 is used here

Page 14: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

Traffic – Radio Bearers

o Radio Bearers

The radio bearers KPIs consist of ten sub-KPIs, one is for the total of radio bearers and

the other nine are for nine QCIs. This set of KPIs can be used to evaluate the average

radio bearers in a cell or a cluster. The radio bearer for each QCI is based on the number

of active RRC connections for each QCI according to the QCI defined in the QoS

information.

……

9__QCIrsRadioBeare

1__QCIrsRadioBeare

RadioBearers

Page 15: LTE Signaling Radio Bearer

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Traffic – Counter Mapping for Radio Bearers

Page 16: LTE Signaling Radio Bearer

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Traffic - Traffic Volume

o Downlink Traffic Volume

Similar to the radio bearers KPIs, the downlink traffic volume KPIs consist of ten sub-

KPIs, one is for the total of traffic volume for DRBs and the other nine are for nine QCIs.

This group of KPIs can be used to evaluate the DL traffic volume in a cell, which is

measured at the PDCP layer excluding the PDCP header

…… 9__QCIolumeDLTrafficV_ _1DLTrafficVolume QCI

o Uplink Traffic Volume

Similar to the downlink traffic volume KPIs, the uplink traffic volume KPIs consist of ten

sub-KPIs, one is for the total of traffic volume for DRBs and the other nine are for nine

QCIs. This group of KPIs can be used to evaluate the uplink traffic volume in a cell. The

KPIs are measured at the PDCP layer excluding the PDCP header.

1__QCIolumeULTrafficV 9__QCIolumeULTrafficV……

DLTrafficVolume

ULTrafficVolume

Page 17: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

Traffic - Counter Mapping for Traffic Volume

Page 18: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

Traffic - Counter Mapping for Traffic Volume

Page 19: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

Service Integrity – Service Average Throughput

o Service Downlink Average Throughput

This KPI consist of nine sub-KPIs mapped into nine QCIs (QCI 1~9), they evaluate the downlink throughput of a service with a specific QCI per user in each cell, it reflects the end-user experience.

o Service Uplink Average Throughput

Same with the service downlink average throughput, this set of KPIs consist of nine

sub-KPIs mapped into nine QCIs (QCI 1~9), and the meaning is also similar with it.

1__QCIhroughputULAverageT

……

9__QCIhroughputULAverageT

1__QCIhroughputDLAverageT

……

9__QCIhroughputDLAverageT

The total downlink traffic volume at PDCP layer of each QCI and total duration for transmitting them are measured within a measurement period. Then the average throughput of each QCI is obtained at the end of the measurement period.

Page 20: LTE Signaling Radio Bearer

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MobileComm Professionals, Inc

Service Integrity – Cell Average Throughput

o Cell Downlink Average Throughput

This KPI evaluates the cell downlink average throughput when there are data transferring

at downlink. It reflects the cell capacity.

The total downlink traffic volume at PDCP layer of cell and total duration for transmitting

which is measured within a measurement period. Then the average throughput of cell is

obtained at the end of the measurement period.

o Cell Uplink Average Throughput

Same with the cell downlink average throughput, this set of KPI reflects the cell

capacity, and the meaning is also similar with it.

CellDLTrafficVolumeCellDLAveThp

CellDLTransferTime

CellULTrafficVolumeCellULAveThp

CellULTransferTime

Page 21: LTE Signaling Radio Bearer

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MobileComm Professionals, Inc

Service Integrity – Cell Maximum Throughput

o Cell Downlink Maximum Throughput

This KPI evaluates the cell downlink maximum throughput when there are data

transferring at downlink. It reflects the cell capacity. It is calculated based on maximum

value of downlink traffic volume which are transferred at each second.

o Cell Uplink Maximum Throughput

Same with the cell downlink maximum throughput. It is calculated based on maximum

value of downlink traffic volume which are transferred at each second.

1 ( )

1000( )

CellULMaxTrafficVolumeforEach s bitCellULMaxThp

ms

1 ( )

1000( )

CellDLMaxTrafficVolumeforEach s bitCellDLMaxThp

ms

Page 22: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

Service Integrity – Counter Mapping for Service Average

Throughput

Page 23: LTE Signaling Radio Bearer

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Application Protocol Identities

Page 24: LTE Signaling Radio Bearer

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LTE UE States

Page 25: LTE Signaling Radio Bearer

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Connection Management

UE State

RRC_CONNECTED

ACTIVE SLEEP

RRC_IDLE MODE

Intra Freq Cell Reselection

Inter Freq Cell Reselection

DRX

Page 26: LTE Signaling Radio Bearer

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Basic State

Page 27: LTE Signaling Radio Bearer

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Call Processing Procedure

Page 28: LTE Signaling Radio Bearer

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Full Basic Layer Configuration

Page 29: LTE Signaling Radio Bearer

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DL Channel Mapping

Page 30: LTE Signaling Radio Bearer

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UL Channel Mapping

PUSCH 0 PUSCH 1

Page 31: LTE Signaling Radio Bearer

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Channel Mapping

Page 32: LTE Signaling Radio Bearer

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Thank You

Page 33: LTE Signaling Radio Bearer

Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center

MobileComm Professionals, Inc

Ray Khastur, ST.

Educational Background : Bachelor of Telecommunication Engineer, Telkom Institute of Technology (2006 –2010) JPPA-N Acceleration

Professional Experience : PI.Works, RAN Consultant (2014 ~ Present) China JIESAI, LTE Optimization Consultant (2014) Lintas Media Telekomunikasi, LTE RF Team Leader (2013 ~ 2014) HUAWEI Tech Investment, CWiL RNP/O Engineer (2011 ~ 2013) Transdata Global Network, CDMA RNO Engineer (2010 ~2011)

Achievements : RF Network Design & Planning First Commercial LTE Network in Indonesia (BOLT! Super 4G LTE)-2013 HUAWEI NPI & Post Launch Optimization BOLT! Super 4G LTE - 2014 PI.Works LTE Technical Expert for HUAWEI Environment LTE Planning & Optimization Trainer Floatway Certified-2013 LTE HUAWEI Trainer for Subcont-2016

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