07 UMTS UTRAN Signaling Procedures

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Transcript of 07 UMTS UTRAN Signaling Procedures

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UMTS UTRAN Signaling Procedureswww.huawei.com

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1 UTRAN System Architecture and Protocol Stack 2 Basic Terms Related to the UTRAN 3 Basic Signaling Procedures

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UTRAN System ArchitectureCore Network Iu RNS Iur RNC Iub Node B Iub Node B Iub Node B RNC Iub Node B RNS Iu

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WCDMA Protocol ArchitectureSMS / GMM / MMRelay

SMS / GMM / MM

RRC RLC MAC L1 Uu

RRC RLC MAC L1

RANAP SCCP Signalling Bearer AAL5 ATM Iu

RANAP SCCP Signalling Bearer AAL5 ATM

UE

RNS

MSC/ SGSN N

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Comparison: GSM-BSS Protocol ArchitectureMS CM MM L3 RR RR RR L2 L1 LAPDm SigL1 BTSM BTSM LAPD SigL1 SCCP MTP SCCP MTPBSSMAP

BTS

BSC

MSC CM MMBSSMAP

LAPDm LAPD SigL1 SigL1

Um

Abis

A

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Protocol Architecture for the RNC Control PlaneCNRANAP

UE

RRC

RNCNBAP

RNSAP

RNC

Node BNBAP Node B Application Part RANAPRadio Access Network Application Part RNSAPRadio Network Subsystem Application Part RRC Radio Resource Control

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Summary

This part describes the UTRAN system architecture and the protocol architecture.

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1 UTRAN System Architecture and Protocol Stack 2 Basic Terms Related to the UTRAN 3 Basic Signaling Procedures

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Basic TermsUTRANprovides setup, maintenance, and release of radio access bearer (RAB) for the Non-Access Stratum (NAS) to shield the focus of the NAS on the features of the radio access stratum. Other terms: UTRAN, RAB, RB, and RL RAB

UE RL

RB NodeB

RNC

CN

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Basic TermsRAB: The service that the access stratum provides to

the Non-Access Stratum (NAS) for transfer of user data between User Equipment and CN.RBThe service provided by the Layer 2 for transfer of

user data between User Equipment and SRNC.RL: A "radio link" is a logical association between single User Equipment and a single UTRAN access point. Its physical realisation comprises one or more radio bearer transmissions.

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UE States- Reducing actions, DRX, and saving power RRC connectionURA_PCH CELL_PCH

CELL_DCH

CELL_FACH

- Dedicated channel - Radio bearers transmission servcieIDLE

These states are significant only for UTRAN and UE. They are transparent to CN.

- Monitoring paging channel - Cell reselection

DEAD

- Searching for the network (PLMN) - Camp on the cell

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Working Modes of the UEThe UE has two working modes: idle mode and connected mode. Idle mode: The UE is in the standby state and has no service for processing. In addition, no connection exists between the UE and UTRAN, and the UTRAN does not contain any information about the UE. The UE is identified by the NAS identifiers, such as the IMSI, TMSI, or P-TMSI. Connected mode: When the UE completes the RRC connection setup, the UE changes from the idle mode to the connected mode. In Connected mode, the UE has four states: Cell-DCH, Cell-FACH, Cell-PCH, and URA-PCH.

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UE States in Connected ModeCell-DCH The UE is in the active state. It communicates over the dedicated channel. The UE has a dedicated channel in both the uplink and downlink. The UTRAN accurately knows the cell on which the UE camps. Cell-FACH The UE is in the active state, but it has few data to send in both the uplink and downlink. It is not required to allocate a dedicated channel for the UE. The downlink data is transmitted over the FACH, and the uplink data is transmitted over the RACH. The UE needs to monitors the FACH in the downlink at any time for its information. The UTRAN accurately knows the cell on which the UE camps and maintains the resources for the UE and its state.

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UE States in Connected ModeCell-PCH The UE has no data to send in the uplink and downlink. It needs to monitor the PICH for receiving paging messages. Therefore, the UE enters the discontinuous reception, which saving the power. The UTRAN knows which cell that the UE camps on. Thus, after the UE roams to another cell, the UTRAN needs to update the cell information of the UE. URA-PCH The UE has no data to send in the uplink and downlink. It needs to monitor the PICH and enters the discontinuous reception. The UTRAN knows only the UTRAN registration area (URA) of the UE. A URA contains multiple cells. That is, the UTRAN updates the location information only after the URA where the UE is located changes, thus saving resources and reducing signaling.HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

Serving RNC and Drift RNCCN Iu SRNC Iur DRNC

In the WCDMA system, the SRNC and DRNC are introduced due to the Iur interface. The SRNC and DRNC correspond to a specific UE. For connections between a UE and the CN, the RNC that is directly connected the CN and controls all resources of the UE is called the SRNC. The RNC that has no direct connection with the CN and only provides resources for the UE is called DRNC. A UE in connection state has at least one and only one SRNC, but can have no or multiple DRNCs.HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

CRNCCN ... CRNC Iu Iub

Node B Cell

Node B Cell Cell

The controller RNC (CRNC) corresponds to a NodeB or cell. The RNC that is directly connected to a NodeB and controls the usage of resources of the NodeB is called the CRNC. A NodeB corresponds to one and only one CRNC. The CRNC allocates the resources of all the NodeBs controlled by the CRNC properly.HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

Summary

This part describes some terms related to the UTRAN.

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1 UTRAN System Architecture and Protocol Stack 2 Basic Terms Related to the UTRAN 3 Basic Signaling Procedures

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Basic Signaling Procedures

System Information Broadcasting Paging Paging Procedure Handover

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System Information Broadcasting

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Overview of the System InformationMIB: includes the PLMN identifier and the scheduling information of the schedule block (SB) and system block (SB). SB1: includes the scheduling information of the SIB. SB2 : includes the scheduling information of the SIB. SIB1: includes the UE timers and counters and the system information at the NAS. SIB2: includes the URA information. SIB3: includes the parameters for cell selection and reselection. SIB4: includes the parameters for cell selection and cell reselection in connected mode. SIB5: includes the parameters for the configuration of the common physical channel in a cell. SIB6: includes the parameters for the configuration of the common physical channel in a cell in connected mode. SIB7: includes the information about the uplink interface and dynamic persistence level. SIB8: includes the static information about the CPCH in the cell. SIB9: includes the dynamic information about the CPCH in the cell. SIB10: includes the information of dynamic resource assignment control (DRAC). SIB11: includes the measurement control information. SIB12: includes the measurement control information in connected mode. SIB13: includes the ANSI-41 system information. SIB14: includes the information in TDD mode. SIB15: includes the information for LCS. SIB16: includes the reconfiguration information about the handover from another system to the UTRAN. SIB17: includes the configuration information of the shared physical channel in connected mode (TDD). SIB18: includes the information of the neighboring PLMN. Note: The network planning engineers should pay more attention to the system information in blue. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

SI1

The SIB1 includes the following information: System information at the NAS, such as LAC, RAC, and T3212 DRX period coefficient of the CS domain: K 6, that is, DRX period 2^k = 2 ^ 6 = 64 TTI = 640 ms. DRX period coefficient of the PS domain K 6, that is, DRX period 2^k = 2 ^ 6 = 64 TTI = 640 ms. Timers and counters of the UE in connected mode or timers of the UE in idle mode

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SI3The System info type 3 includes the parameters for cell selection and reselection. Qhyst2s: indicates the cell reselection hysteresis of Ec/Io measurement. Sintrasearch: indicates the intra-frequency reselection start threshold. Sintersearch: indicates the inter-frequency reselection start threshold. SinterRatsearch: includes the inter-system reselection start threshold. Qqualmin: indicates the minimum quality standard for cell selection. Qrxlemin: indicates the minimum access level for cell selection. T reselection: indicates the reselection hysteresis time. Max Allowed UE TX power: indicates the maximum transmit power allowed by the UE.

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SI5

The System info type 5 incl