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LTE-A系统中采用了全IP承载,随着数据流向下层的不断传输,互联网各层协议封装的报头信息越来越大,当传输的数据包负载部分较小时,报头部分所占比例较大,降低了通信链路中带宽的利用率.为了提高系统吞吐率,在OAI平台上对LTE-A系统采用了鲁棒性报头压缩(ROHC,robust header compression)协议,针对ROHC协议中O模式下WLSB算法不够灵活的特点,提出一种自调整的窗基压缩编码算法(self-tuning Window based LSB,ST-WLSB),建立了三种信道状态,设置误码率界值,使用信道预估计技术计算出误码率,得出此时信道所处的状态,从而动态地改变滑动窗口大小.仿真测试表明,相比于WLSB算法,该算法具有更好的压缩效率.
In the LTE-A system, an all-IP bearer is adopted. As data flows continue to be transmitted to lower layers, header information encapsulated in protocols at all layers of the Internet becomes larger and larger. When the transmitted data packet has a small load, the header part occupies a larger proportion , Reducing the bandwidth utilization in the communication link.In order to improve the system throughput, a robust header compression (ROHC) protocol is adopted for the LTE-A system on the OAI platform. For the ROHC protocol in O mode WLSB algorithm is not flexible enough, a self-tuning window based LSB (ST-WLSB) is proposed. Three channel states are set up, and the bit error rate (BER) threshold is set. Using the channel estimation technique The bit error rate is calculated and the state of the channel is obtained at the moment, so the size of the sliding window can be dynamically changed.The simulation results show that the proposed algorithm has better compression efficiency than the WLSB algorithm.