Study on dynamic channel switch in License-Assisted-Access based on Listen-Before-Talk
Hongdou Li, Yongyu Chang, Fanrong Hao, Aidong Men, Jian Zhang, Wei Quan · 2016
License-Assisted-Access technology enables LTE to operate on unlicensed bands. It is promising to enhance LTE system capacity efficiently and meet the future requirements of increasing the volume of data. Nevertheless, coexistence among several wireless communication systems on unlicensed bands, for example LAA and WiFi, has become a key problem to be solved. In this paper, channel switch is considered in LAA to achieve a harmonious coexistence with WiFi. First, an enhanced Listen-Before-Talk scheme with channel switch is proposed, where a frozen period is introduced to guarantee appropriate channel switch decision and release channel for other systems' use. Then a proportional fair based dynamic channel switch method is presented, which dynamically make channel switch according to channel selection probability. Thus it can enable LAA to make best use of unlicensed bands and to coexist with other systems in an efficient way. Finally, simulation results validate that the proposed schemes can yield the hybrid system performance and the advantage of the proposed schemes is especially obvious when the system packet arrival rate is in a relatively low level.