Down synchronous monitoring method without secondary encoding/decoding operation

Abstract

The invention discloses a downlink synchronous monitoring method without second coding and decoding operation: a voice algorithm which is distributed by a local code-converter is used for searching a TFO frame without the second coding and decoding operation which is transmitted from a far end. The method searches the TFO frame which is transmitted from the far end according to the voice algorithm which is distributed by the local code-converter and carries out the search according to the characteristics of the different TFO frames; the AMR half-rate voice algorithm and the AMR full-rate voice algorithm are specially combined for research, thus improving the search efficiency; when in search of a synchronous head of the TFO frame, the search sequence of continuous 0 and synchronous 1 of the synchronous head is cleverly arranged, thus improving the search efficiency.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a downlink synchronous monitoring method without secondary codec operation (TFO, Tandem Free Operation). Background technique [0002] In wireless communication technology, the call system using TFO mode from terminal (MS, Mobile Station) to terminal, such as figure 1 shown. Take Terminal 1 calling Terminal 2 as an example: Terminal 1 performs speech coding on the speech signal using speech algorithm 1, and converts it into speech coding parameters; Terminal 1 sends the speech coding parameters to Base Station 1 through air interface 1, and Base Station 1 performs speech coding parameters Channel decoding, correcting channel errors in the speech coding parameters and removing redundant information, and sending the speech coding parameters after channel decoding to the code converter 1 through the Abis port 1. Code converter 1 converts speech coding parameters int...

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Problems solved by technology

[0029] If the EMBED value in Table 3 is 1, it indicates that the TFO message is inserted into the HR_AMR_8KTFO frame. At this time, part of the synchronization bits in the synchronization frame shown in Table 3 will be covered by the TFO message, making the TFO frame structure of HR_AMR_8K more complicated.

[0030] Under the existing TFO, when the code converter at the local end receives PCM data, it searches the TFO frame data separately according to various algorithms, and directly searches for consecutive 0s in the synchronization header, and the search efficiency is low; when the PCM data is embedded with TFO When receiving a message, the original TFO frame data characteristics will be changed, and wrong judgments will occur on the TFO frame, which will affect the recognition of voice data.

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