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

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...

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 RNC initiates the Iu interface radio resource release (Iu Release), causing the fact that the call is dropped

[0009] For the out-of-synchronization problem of the physical layer (L1) in the uplink, in the CELL-DCH state, if the physical layer continuously reports a set number of out-of-synchronization indications, the NodeB will start the timer, and notify the RNC after the timer expires Radio link failure (RL fail), RNC initiates Iu Release (Iu interface radio resource release), causes actual call drop; For the RLC sub-layer problem in the uplink, in confirmation mode, the RLC sub-layer loses the uplink data packet ( block) will lead to retransmission. After the retransmission of uplink data packets reaches the set number of times, the UE requests the NodeB to reconfigure (Reset) the RLC sublayer. If no response is obtained or the reconfiguration reaches the set number of RLC sublayers. Idle mode, causing actual call drop

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