A method for transmitting half-rate voice data

Abstract

The invention discloses a method for transmitting half-rate voice data, which comprises the following steps: (a) a baseband processing unit packages the half-rate voice service data in the format of transcoder rate adapter unit (TRAU) frame, and transmits on high-speed channel main time slot; (b) a fast Ethernet interface board travels the high-speed channel main time slot data corresponding to the wireless time slot and performs the synchronous head search, after finding the synchronous head, the fast Ethernet interface board strips the half-rate voice data extracted from the synchronous head if judging that the voice data type represented by the control bit is half-rate type, and then transfers for the next uplink treatment. The inventive method can reduce the operating load cost and complexity of the interface processing unit and thereby reduce the software implementation complexity and hardware single board cost of fast Ethernet interface board.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method for transmitting half-rate voice data. Background technique [0002] In the application field of GSM (Global System for Mobile Communications, Global System for Mobile Communications), HW (High Speed ​​Access, HigHWay) time slots are often used to transmit voice data. For example, it is applied to a system of a BTS (Base Tranceiver Station, base transceiver station) and a BSC (Base Station Controller, base station controller) connected by a large number of E1 interfaces. [0003] The traditional implementation of E1 Abis (the interface between the base transceiver station and the base station controller) is as follows: at both ends of the BTS and the BSC, prepare their respective uplink and downlink voice data, according to the protocol specification, with a certain synchronization header and control bits (bit), which is transmitted to the other side by TDM (Time-d...

AI Technical Summary

Problems solved by technology

If the TDM-to-IP interface processing unit has to search for the synchronization header and deframe the corresponding work for each encoding method, it will be very cumbersome and the operating overhead will be very high.

[0013] In consideration of the transmission efficiency of control plane signaling (operation and maintenance signaling, and service signaling), FIB only forwards the control plane signaling after format conversion, and does not perform application layer (layer 3) processing; therefore, FIB cannot To know the type of service currently transmitted in a certain time slot; and the type of service channel may change dynamically with the number of user calls, which also brings a lot of trouble to the judgment based on the signaling method

[0014] After voice services support AMR, coding becomes more complicated, especially for HR services, when transmitting 7.40K voice frames supporting AHS, because the synchronization header is very short, it is very difficult to directly search for it when the service type is unknown

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