Method, system for updating cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network and user equipment

A TD-SCDMA, cell update technology, applied in electrical components, wireless communication, etc., can solve the problems of lost uplink data packets, unrecoverable error notification, actual call drop, etc., to reduce the call drop rate and speed up the cell update process. Effect

Inactive Publication Date: 2011-06-01
中国移动通信集团广西有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. Unrecoverable error notification
[0008] Aiming at the out-of-sync problem of the physical layer (L1) in the downlink, in the CELL-DCH state, if the out-of-sync indication (out of sync) of the set number of consecutive physical layer reports (the specific value is set by setting the parameter N313) is received, the UE The timer will be started (the specific timing value is set by parameter T313). After the timer expires, the UE confirms that the radio link fails and triggers a cell update (Cell Update); for the RLC sublayer problem in the downlink, in the confirmation mode, The loss of downlink data packets (blocks) at the RLC sublayer will lead to retransmission. After the retransmission of downlink data packets reaches the set number of times, the NodeB requires the RNC to reconfigure (Reset) the RLC sublayer. If the reconfiguration reaches the set number of times, the RLC sublayer does not recover. , then the R

Method used

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  • Method, system for updating cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network and user equipment
  • Method, system for updating cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network and user equipment
  • Method, system for updating cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network and user equipment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment addresses the problem of out-of-synchronization of the physical layer (L1) in the downlink.

[0052] According to the existing technology, in the CELL-DCH state, if the UE receives N313 out-of-sync indications (out of sync) continuously reported by the physical layer, the UE will start the timer T313. After the timer T313 expires, the UE will confirm that the radio link has failed. Trigger cell update (Cell Update), the UE obtains the RSCP (Receive Signal Code Power, received signal code power) of each adjacent cell by measuring the adjacent cells, selects the target cell according to the RSCP of each adjacent cell, and then sends the UE to the UTRAN Send a cell update message, and the RNC in UTRAN returns a cell update confirmation message to UE, indicating the new radio resource allocated for UE in the target cell; UE accesses the target cell according to the new radio resource, and sends physical channel reconfiguration to UTRAN Success message, indic...

Embodiment 2

[0071] This embodiment is proposed aiming at the RLC sublayer problem in the uplink.

[0072] According to the existing technology, in the confirmation mode, the loss of the uplink data packet (block) at the RLC sublayer will cause retransmission. After the retransmission of the uplink data packet reaches the set number of times, the UE requires the NodeB to reconfigure (Reset) the RLC sublayer. If the RLC sublayer does not recover after getting a response or reconfiguration reaches the set number of times, the UE directly enters the idle mode, resulting in actual call drop. The retransmission of the uplink data packet (Block) in the RLC sublayer and the time consumed for reconfiguring the RLC sublayer can be obtained from RRC SETUP, RB RECONFIGSETUP and other messages and calculated. In specific implementation, the time scale obtained through calculation is 1-10s.

[0073] The embodiment of the present invention proposes that in the confirmation mode, if the UE requests the ...

Embodiment 3

[0077] This embodiment is proposed aiming at the problem of out-of-synchronization of the physical layer (L1) in the uplink and the problem of the RLC sublayer in the downlink.

[0078] According to the prior art, in the CELL-DCH state, if the out-of-synchronization indication of the set number of consecutive physical layer reports is received, the NodeB will start the timer, and after the timer expires, the RNC will be notified that the radio link fails (RL fail), and the RNC Initiate Iu ​​Release (release of radio resources on the Iu interface), resulting in actual call drop; in confirmed mode, the loss of downlink data packets (blocks) at the RLC sublayer will lead to retransmissions, and NodeB will request the RNC after the retransmission of downlink data packets reaches the set number of times Reconfigure (Reset) the RLC sublayer, if the reconfiguration reaches the set number of times and the RLC sublayer does not recover, then the RNC initiates the Iu interface radio reso...

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Abstract

The invention discloses a method and system for updating a cell in a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network and user equipment, which are used for reducing the call drop rate of the UE in the TD-SCDMA network. The cell updating method comprises the following steps of: when the UE confirms to meet a preset cell update triggering condition, selecting a target cell according to a latest measurement result of common-frequency measurement and pilot frequency measurement and sending a cell updating message, wherein the cell update message carries the identification information of the target cell; and after the UE receives a cell update confirmation message returned by an RNC (Radio Network Controller), accessing a new radio resource distributed to the UE in the target cell, which is indicated in the confirmation message.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a cell update method, system and user equipment in a TD-SCDMA (Time Division Synchronous Code Division Multiple Access) network. Background technique [0002] The basic network structure of the TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system consists of UE (User Equipment, user equipment), UTRAN (UMTS Terrestrial Radio Access network, UMTS terrestrial radio access network; UMTS: Universal Mobile Telecommunications System (Universal Mobile Telecommunications System) and CN (Core Network, Core Network) are composed of three parts. The UTRAN includes two nodes, a NodeB (base station) and an RNC (Radio Network Controller, radio network controller). The RNC is mainly responsible for the management of the UTRAN, and the NodeB is mainly responsible for sending and receiving wireless signals. The radio interface of the TD-SCDMA system is divided into three p...

Claims

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Application Information

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IPC IPC(8): H04W36/30
Inventor 汪凯张虹苏华强黄展李新
Owner 中国移动通信集团广西有限公司
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