Adaptive VoIP Multiplexing in LTE Backhaul
LTE has a distributed system architecture optimized for IP connectivity. Circuit switched technology is not supported by LTE at all; therefore it provides VoIP based voice service only. In LTE, VoIP packets are carried with significant protocol overhead, thus transporting each voice packet separately is a waste of bandwidth. A possible way to improve the bandwidth efficiency of voice service over LTE is to multiplex the packets of parallel VoIP connections into a single transport frame. On the downside, multiplexing requires that some VoIP packets are retained which in turn will increase their end-to-end delay. This paper proposes a multiplexing method, which provides a good balance between bandwidth gain and quality of service by adapting its operation to the actual traffic mix.