Method for realizing synchronization timing of access point in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system

Abstract

The invention discloses a method for realizing synchronization timing of Access Points (AP) in a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system. The method comprises the following steps of: searching and acquiring a macro base station frequency point signal in a macro base station frequency point list according to the acquired macro base station frequency point list information; judging whether a signal with signal intensity exceeding a predetermined signal intensity threshold of the macro base station frequency point exists in the acquired macro base station frequency point signal, and selecting the strongest macro base station frequency point signal from the acquired macro base station frequency point signal for the downlink synchronization timing if the signal exists. By adopting the invention, a macro base station corresponding to the strongest signal is selected to execute the air interface synchronization timing of the AP and the macro base station by using the characteristics of higher power, lower penetration loss and high synchronization timing precision of the macro base station at a network side without increasing external synchronous signal sources or new hardware devices, the cost in realizing the AP synchronization timing is low and the operation is simpler, the influence of the factors, such as, delay variation of a transmission network, and the like is avoided and the AP synchronous precision can be ensured.

Description

technical field [0001] The present invention relates to Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) synchronization technology, in particular to a method for realizing synchronous timing of access points (AP, Access Point) in the TD-SCDMA system. Background technique [0002] The TD-SCDMA system has the advantages of asymmetric uplink and downlink, high spectrum utilization, and low transmission power. It is very suitable for applications with a large number of asymmetric data services and can provide high system capacity. [0003] The home base station (TD Femto) cell in the TD-SCDMA system is a small cellular access point (AP). Through the broadband Internet connection, the operator can use the existing broadband connection in the building to provide new mobile broadband services to residential Enhanced mobile voice, video and data services are provided to customers in the network, which not on...

AI Technical Summary

Problems solved by technology

It is necessary to add a synchronization timing signal source device, which increases the cost of synchronization timing; furthermore, due to factors such as delay jitter of the transmission network, it is difficult to obtain the time offset calculated according to the path delay to meet the synchronization timing accuracy requirements of the AP, and it is easy to generate Mutual interference and interference to the macro base station; moreover, synchronous timing needs to obtain more time parameters and a large amount of calculation

[0022] As for the synchronous timing method of the GPS receiver, although the synchronous timing process is relatively simple and the accuracy is high, since the GPS receiver is a low-power communication system, and the AP is an indoor device, therefore, in the indoor propagation environment with penetration loss Under the circumstances, the timing signal of GPS satellites attenuates very sharply, resulting in the poor quality of the timing signals received by the indoor AP from GPS satellites, or even failing to receive the timing signals. Therefore, the synchronization timing process cannot be performed. Further, the GPS receiver is used for synchronization. Timing, you need to pay the corresponding fee, which also increases the communication cost of the TD Femto cell

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