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Cell handoff method of TD-SCDMA communication system

A code division multiple access and communication system technology, which is applied in the field of cell handover selection by mobile stations, can solve the problems of many handover times and difficult cell handover judgment, and achieves the effects of accurate handover judgment and reasonable handover

Inactive Publication Date: 2009-02-18
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, it is difficult to judge the handover of the cell, and the number of handovers is large

Method used

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  • Cell handoff method of TD-SCDMA communication system
  • Cell handoff method of TD-SCDMA communication system
  • Cell handoff method of TD-SCDMA communication system

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Embodiment Construction

[0018] The following is based on image 3 The implementation of the present invention will be described in detail.

[0019] 1. Divide the value of the round-trip delay RTT measured by the base station subsystem of the cell by 2 to determine the uplink timing advance Y of the user terminal equipment BT . The uplink and downlink timing advances are equal, and only one side (uplink or downlink) can be measured. Generally, the timing advance is the so-called uplink timing advance. (The timing advance is measured by both the base station subsystem and the user terminal, and the result is finally determined by the base station subsystem. The specific method is: the base station subsystem sends a measurement type identifier to the user terminal at time T1, and the user terminal receives the identifier at time T1 T2, the user terminal returns the measurement identifier to the base station subsystem at time T3, and the base station subsystem receives the identifier at T4. Time advan...

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Abstract

This invention relates to a local area switch method for time division synchronization CDMA communication system, which gets the time advance volumes of the local and adjacent areas of the current location and the power loss factors based on the test base station system and the maximum radius of them to determine the threshold value of the time advance volume of them and the power loss factor threshold values of them then to compare them and operate on them to decide if they are switched finally.

Description

technical field [0001] The invention relates to a time division synchronous code division multiple access (TD-SCDMA) mobile communication system, in particular to a cell switching selection method for a mobile station in the system. Background technique [0002] In the cellular mobile communication system, after the mobile station is turned on, it needs to measure the wireless characteristics of the downlink of the serving cell and the broadcast channel of the adjacent cell. The measured results are used as the basis for power control and switching. [0003] TD-SCDMA is a time division duplex system. At a certain moment, there is only one-way data transmission on the air interface. In the 3GPP standard, the TD-SCDMA standard based on the low chip rate is 7 service time slots TS (time slot) plus two pilot time slots, two uplink and downlink switching points, each subframe is 5ms, and the frame structure is as attached in the manual figure 1 shown. Since TD-SCDMA is a time-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/30H04W36/08
CPCY02D30/70
Inventor 李罗保季明泉谢宝国
Owner ZTE CORP
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