A method of transmitting half-rate voice data

Abstract

The invention discloses a method for transmitting half-rate voice data, which includes the following steps: (a) the baseband processing unit encapsulates the half-rate voice service data according to the format of the code conversion rate adaptation unit frame, and transmits it on the main time slot of the expressway ; (b) The fast Ethernet interface board traverses the corresponding high-speed channel main time slot data of the wireless time slot, and searches for the synchronization header. After the synchronization header is found, if it is judged that the service data type represented by the control bit is a half-rate type, the synchronization is stripped. The head takes out half-rate voice data and forwards it to subsequent uplink processing. By adopting the method of the invention, the operating load overhead and complexity of the interface processing unit can be simplified, thereby simplifying the software implementation complexity and hardware single-board implementation cost of the fast Ethernet interface board.

Description

technical field [0001] The invention relates to the communication field, 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 (Highway, HighHWay) time slots are often used to transmit voice data. For example, it is applied in a system of BTS (Base Tranceiver Station, Base Transceiver Station) and BSC (Base Station Controller, Base Station Controller) connected by a large number of E1 interface modes. [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, the respective uplink and downlink voice data are prepared, according to the protocol specification, with a certain synchronization header and control bits (bit), transmitted to the other side through TDM (Time-division multiplexing, t...

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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