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Abstract
On the Abis interface which is between BSC(Base Station Controller) and BTS(Base Transceiver Station), the throughput of data is fixed at 2Mbps- As networks become larger and larger, and there are more and more uesrs, signals may be blocked and data may be lost at network when it is busy- And since the half rate technology has been widely used, the bandwidth of the LAPD(Link Access Protocol on the DM Channel) on the Abis interface is becoming limited- As the reason given above, it is very important and useful to increase the throughput of the Abis interface- In order to double the throughput of the Abis interface, the software compression technology is used, which is always used in upper layer of OSI model- This paper proposed a new compression algorithm called LZ77++, taking considering of the latest GSM transport protocol, characteristics of data in the Abis interface- Data in Abis interface is de-muxed and compressed at one side- And the data will be muxed and decompressed at the other side- The proposal described in this paper has been implemented in the A-Bis over IP Gateway system of BroadBand High Technology Inc- The experiemental result has proven that it could increase the throughput of the Abis interface significantly, and it is worthy for further research-