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Inter-base station synchronization method in time division multiple access system

A technology of time division multiple access and between base stations, which is applied in the direction of synchronization devices, electrical components, selection devices, etc., can solve the problems of deterioration of synchronization effect and failure to automatically restore synchronization immediately, and achieve good synchronization effect, low cost, and self-healing recovery ability strong effect

Inactive Publication Date: 2008-05-21
ZTE CORP
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Problems solved by technology

However, in order not to affect the users of the network, the synchronization is not performed in real time, and needs to be performed at regular intervals
During this interval, synchronization is maintained by self-generated clocks or by extracting line clocks, which degrades over time
In addition, because the base stations in the network, including the main base station connected to GPS, must perform the synchronization process at a preset time, so, in some abnormal situations, such as network power failure recovery, before the main base station performs synchronization calibration, the method Failed to automatically resume syncing now

Method used

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  • Inter-base station synchronization method in time division multiple access system

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, the implementation of this technical solution is described in further detail:

[0026] As shown in Figure 1, it is the basic frame format of the TDMA communication system. Divided into multiple time slots according to time, these time slots are divided into sending time slots and receiving time slots; sending time slots are used to send downlink data to users; receiving time slots are used to receive uplink data sent by users.

[0027] When different base stations have time slot deviation due to asynchrony, the uplink and downlink time slots of different base stations will overlap in time. In the case of overlapping, the sending time slot of one base station will interfere with the receiving time slot of another base station. Interference not only affects communication quality, but also reduces system utilization.

[0028] As shown in Figure 2, the Personal Handyphone System (PHS) is a TDMA communication system with a st...

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Abstract

The present invention relates to a synchronous method among the base stations of time-division multiple-access mobile communication system, which is provided with a master-base station and a plurality of slave-base stations, the master-base station gets real-time synchronization by the means of global positioning system (GPS) or other system available with time benchmark, transmits the synchronous grade information through the control channel time slots; the slave-base station sets all the idle service channel time slots to receiving status to receive the control channel signal of other base stations, selects the right base station to conduct the real-time synchronization, and then transmits synchronous grade information through the control channel time slots after setting the synchronous grade of the slave-base station. As operated under the prior hardware, the invention has the advantage of low cost and non manual intervention; simultaneously, the invention has the strong ability of self-recovery, capable of recovering the synchronization of the whole communication network fast while the network is recovery from power off.

Description

technical field [0001] The invention relates to a synchronization method between base stations in a mobile communication system, in particular to a synchronization method between base stations in a time division multiple access mobile communication system. Background technique [0002] For the TDMA mobile communication system, good synchronization is required between the base stations in the system, otherwise, due to the time slot deviation between the non-synchronized base stations, interference will be caused to each other and the communication quality will be affected. [0003] For the synchronization of the base stations in the time division multiple access mobile communication system, there are mainly two methods at present. [0004] The first method is to add a common time reference device on each base station, as described in the patent "CN200510087799 Method and Device for Realizing Synchronization of Base Stations in a Time Division Duplex System". GPS equipment is...

Claims

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Application Information

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IPC IPC(8): H04Q7/30H04Q7/22H04W56/00
Inventor 单德悦
Owner ZTE CORP
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