Auxiliary carrier signal quality estimating and carrier selecting method for TD-SCDMA system

Abstract

This invention discloses a quality evaluation of TD-SCDMA system assistant carrier frequency signals and the carrier frequency selection method. The network side emits reference channels on each auxiliary carrier frequency and broadcasts its frequency, the reference power of the reference channel and test control information containing test quantity as the assistant carrier frequency reference channel received signal code power, the mobile terminal starts the test process according to the system broadcast information or the test control order of the network side to test the received signal code power of the assistant carrier reference channel and reports the test result to the network side, which selects suitable carrier and allocates special resources for the mobile terminal.

Description

technical field [0001] The present invention relates to a signal quality evaluation and carrier frequency selection method of a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) mobile communication system, in particular to a method for evaluating the signal quality of an auxiliary carrier frequency in a cell multi-carrier frequency coverage mode and based on the evaluation result carrier frequency selection method. Background technique [0002] In the TD-SCDMA system, multi-carrier frequency coverage in the same cell (including omni-directional cells and sector cells) is an important means to increase system capacity. The current cell multi-carrier coverage mode has the following characteristics: [0003] A: For each cell, one of the assigned frequency points is determined as the main carrier frequency, and the remaining frequency points are used as auxiliary carrier frequencies. The main carrier frequency and auxiliary carrier frequency use the same scram...

AI Technical Summary

Problems solved by technology

For the primary carrier frequency, the current standard provides the P-CCPCH physical channel as a reference channel, and defines the received signal code power (RSCP) measurement of the P-CCPCH. However, for the auxiliary carrier frequency, the current standard does not provide corresponding The reference channel and measurement quantity of

[0007] In a multi-carrier frequency coverage cell, when the mobile terminal (UE) transitions to the CELL_DCH state (cell dedicated channel state), or needs to switch between multiple carrier frequencies in the cell, the signal quality of the secondary carrier frequency cannot be determined. Perform measurement and evaluation, so the network can only consider factors such as load conditions when selecting a carrier frequency for the UE and allocating dedicated resources

[0008] However, the current inter-cell handover method in the multi-carrier coverage mode of the cell has the following disadvantages: since there is no reference channel for channel estimation in the secondary carrier frequency in the current mode, the UE has no way to check the target secondary carrier frequency of the target cell before handover. for effective channel estimation

This leads to the fact that the inter-cell handover decision can only be made based on the channel quality of the main carrier frequency of the target cell, and if the handover decision is successful, the UE will be allocated to the main carrier frequency of the target cell or a certain auxiliary carrier frequency for dedicated channel transmission

Since the channel quality of the main carrier frequency and the auxiliary carrier frequency are different, this handover method may lead to a blind handover behavior, that is, the UE is handed over to a poor carrier frequency for dedicated channel transmission, which will make the UE's Decrease in call quality, increase network load, and in extreme cases, cause UE to drop calls

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