Frame selection method and device

Abstract

The invention provides a frame selection method and a frame selection device, which are used in the situation of Abis interface link delay jitter in a code division multiple access (CDMA) system. The method comprises the following steps that: when an Abis interface link delay jitters, a base station controller (BSC) determines a maximum delay of an Abis interface link transmission frame and computes a first number of frames needing to be buffered currently according to the maximum delay; the BSC adjusts a second number of the frames carrying data which can be stored in a buffering area of the BSC according to the first number; and when the number of the frames carrying the data stored in the buffering area of the BSC reaches the second number, the BSC selects the frames carrying the data which meets an upper service from the frames carrying the stored data, and transmits the frames to the upper service. The method and the device can solve problems.

Description

technical field [0001] The present invention relates to the communication field, in particular to a frame selection method and device. Background technique [0002] In the field of CDMA (Code Division Multiple Access, code division multiple access), there are many types of handoff Handoff, among which there is a soft handoff Soft HandOff, the basic principle is that when the mobile station is under the control of the same BSC (Base Station Controller, base station controller) In the area between adjacent BTSs (Base transceiver stations, base transceiver stations), the mobile station establishes a wireless connection with the target BTS while maintaining the wireless connection with the source BTS, and then releases the wireless connection with the source BTS. It plays the role of diversity of traffic channels at the junction of two BS (Base Station, base station) coverage areas, which can greatly reduce call drop caused by handover. Because according to the test statistics ...

AI Technical Summary

Problems solved by technology

[0005] Since the CDMA system has soft handover, a problem arises in the IP-based BSC and BTS connection: when the delays and jitters on different legs are inconsistent, the time for frame data on different legs to reach the BSC may be inconsistent, which may cause BSC When selecting frames, the frame data decoded by the BTS at the same time is not compared, resulting in out-of-sequence, frame loss, repetition, etc.

[0007] For related technologies, fixed buffering is used to solve link delay jitter. For voice services, increasing the buffer inevitably increases the delay of voice. For data services, the buffer increases the time of data on the link. In the case of frame errors on the air interface, it is easy to cause data retransmission, thereby reducing the rate of data services. No effective solution has been proposed yet.

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