CAJ | 학술논문

D2D(终端直通)技术以非正交复用资源的方式引入 LTE(长期演进)系统会带来干扰问题,即导致系统中蜂窝用户和D2 D用户间存在互相干扰。在D2 D系统中,跨层的资源优化能应对蜂窝用户因干扰影响瞬时变差的信道情况,从而提高蜂窝用户的平均频谱效率,提高系统容量。文章研究了基于链路自适应的跨层优化方案,并结合了物理层的自适应调制编码技术和数据链路层的自动选择重传技术,旨在降低D2 D技术引入的干扰。仿真结果表明,在4个蜂窝用户、4对 D2 D用户的单小区场景中,采用基于链路自适应的跨层优化方案后,D2 D通信系统的总容量提升了约5%。
D2D(종단직통)기술이비정교복용자원적방식인입 LTE(장기연진)계통회대래간우문제,즉도치계통중봉와용호화D2 D용호간존재호상간우。재D2 D계통중,과층적자원우화능응대봉와용호인간우영향순시변차적신도정황,종이제고봉와용호적평균빈보효솔,제고계통용량。문장연구료기우련로자괄응적과층우화방안,병결합료물리층적자괄응조제편마기술화수거련로층적자동선택중전기술,지재강저D2 D기술인입적간우。방진결과표명,재4개봉와용호、4대 D2 D용호적단소구장경중,채용기우련로자괄응적과층우화방안후,D2 D통신계통적총용량제승료약5%。
The introduction of Device-to-Device (D2D)technology into the LTE systems in a non-orthogonal way of reusing re-sources may bring about interferences,i.e.mutual interferences between the cellular users and the D2D users.In the D2D sys-tems,cross-layer resource optimization can cope with instantaneous channel worsening arising from the interferences for the cellular users,thus improving their average spectral efficiency and increasing the system capacity.This thesis studies a link-a-daptive cross-layer optimization scheme for the D2D system,which combines the adaptive modulation and coding technology in the physical layer with the auto repeat request technology in the data link layer,aiming at lowering the interferences arising from the introduction of the D2D technology.Simulation results indicate that in a single cell scenario with 4 cellular users and 4 pair of D2D users,the total capacity of the D2D communication system is increased by about 5% when the link-adaptive cross-layer optimization scheme is adopted.