Transport format combination selection method and device

Abstract

The invention provides a transport format combination selection method and device. The method includes that: bit rate metric value of each transport format combination in a transport format combination set corresponding to the current coding combination transmission channel is calculated; maximum and minimum transport format combinations in the transport format combination set are determined; whether transport format combination is required to be reselected is judged according to average transmitted power of the current transport format combination in the maximum transmission time interval, available transmitted power and the maximum and minimum transport format combinations; when transport format combination is determined to be reselected, a transport format combination subset is determined according to the bit rate metric value of the current transport format combination; and the current transport format combination is reselected from the transport format combination subset according to data volume to be transmitted by radio link control layer and priority of logical channel. The invention can effectively improve antijamming capability of link.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method and a device for selecting a transmission format combination. Background technique [0002] Compared with the 2G wireless access system, 3GPP has added a new concept in its 3G wireless access system, that is, coded combined transport channel (CCTrCH), which is composed of multiple transport channels (TrCH). Each transport channel contains multiple transport formats (TFs). In one CCTrCH, various transport formats of each transport channel are combined into a Transport Format Combination Set (TFCS) according to the agreed relationship. When sending data to the air interface, the sending end needs to select a transport format combination (TFC) in the transport format combination set to control the effective data rate of each transmission channel in the air interface. [0003] 3GPP 25.321 defines the processing flow of transport format combination selection...

AI Technical Summary

Problems solved by technology

In the prior art, when selecting the combination of transmission formats, the power capability of the transmitting end is not considered. However, the Code Division Multiple Access (CDMA) system is an interference-limited system, and the power of the transmitting end is always limited. When the transmitting power of a CCTrCH reaches When the maximum transmission power is limited, the adjustment of the closed-loop power control system at the receiving end cannot make the transmission channels of CCTrCH meet the QoS requirements, resulting in data decoding errors, and when a large amount of data is decoded, it will cause the current link to lose synchronization. This causes call drop, which is especially obvious in the case of insufficient network coverage

It can be seen that the transmission format combination selection according to the existing method, the anti-interference ability of the link is low

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