Visible to the public RaptorQ code based concurrent transmissions in dual connectivity LTE network

TitleRaptorQ code based concurrent transmissions in dual connectivity LTE network
Publication TypeConference Paper
Year of Publication2017
AuthorsLi, J., Hua, C.
Conference Name2017 9th International Conference on Wireless Communications and Signal Processing (WCSP)
Date Publishedoct
Keywords3G mobile communication, 3GPP specifications, associated MeNB, cellular radio, Computer architecture, concurrent transmission scheme, concurrent transmissions, Decoding, delays, downlink U-plane data, dual connectivity LTE network, encoded symbols, encoding, error correction codes, forward error correction, Long Term Evolution, Long Term Evolution network, master eNB, MeNB-UE, nonideal backhaul link, Out of order, out-of-order packet delivery problem, out-of-order problem, per-user throughput, pubcrawl, RaptorQ FEC code, Resiliency, Scalability, secondary eNB, security, SeNB-UE links, source data, Throughput, user equipment

Dual Connectivity(DC) is one of the key technologies standardized in Release 12 of the 3GPP specifications for the Long Term Evolution (LTE) network. It attempts to increase the per-user throughput by allowing the user equipment (UE) to maintain connections with the MeNB (master eNB) and SeNB (secondary eNB) simultaneously, which are inter-connected via non-ideal backhaul. In this paper, we focus on one of the use cases of DC whereby the downlink U-plane data is split at the MeNB and transmitted to the UE via the associated MeNB and SeNB concurrently. In this case, out-of-order packet delivery problem may occur at the UE due to the delay over the non-ideal backhaul link, as well as the dynamics of channel conditions over the MeNB-UE and SeNB-UE links, which will introduce extra delay for re-ordering the packets. As a solution, we propose to adopt the RaptorQ FEC code to encode the source data at the MeNB, and then the encoded symbols are separately transmitted through the MeNB and SeNB. The out-of-order problem can be effectively eliminated since the UE can decode the original data as long as it receives enough encoded symbols from either the MeNB or SeNB. We present detailed protocol design for the RaptorQ code based concurrent transmission scheme, and simulation results are provided to illustrate the performance of the proposed scheme.

Citation Keyli_raptorq_2017