Bingxuan Zhao, K. Kitagawa, T. Fujimoto, K. Yunoki, R. Kataoka, H. Shinbo
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引用次数: 0
摘要
在第五代(5G)系统中,为了增加系统容量,部署了毫米波(mmW)小型蜂窝。为了扩大毫米波小型小区有限的覆盖范围,涉及设备到设备(D2D)通信的网络辅助中继是关键的有前途的技术之一。然而,在5G系统的典型部署场景——拥挤区域,由于D2D同步信号的强烈碰撞,传统的中继路径选择方案不适用。此外,在选择中继路径时,传统的方案没有考虑连接Internet的回程质量,而对于一些保证比特率(Guaranteed Bit Rate, GBR)类型的业务(如会话视频),回程质量是保证端到端吞吐量所必需的。为了解决这些问题,该方案通过应用请求吞吐量等约束来排除不能满足约束的中继用户,从而减少发送D2D ss的候选中继用户的数量。作为仿真结果的一个例子,可以观察到,在远程用户请求的吞吐量设置为13.6 Mbps的情况下,与传统方案相比,所提出的方案将D2D ss的数量减少了96%。
Reduction Scheme of SS for D2D Relay-Path Selection to Achieve Guaranteed Throughput for 5G systems
In the fifth generation (5G) systems, millimeter wave (mmW) small cells are deployed in order to increase the system capacity. In order to extend the limited coverage of the mmW small cells, network-assisted relay involving device-to-device (D2D) communication is one of the key promising techniques. However, in the crowded area, which is a typical deployment scenario of 5G systems, conventional relay-path selection schemes are not applicable due to intense collisions of D2D synchronization signals (SSs). In addition, when selecting the relay-path, conventional schemes do not consider the backhaul quality to connect the Internet, which is necessary to guarantee end-to-end throughput for some Guaranteed Bit Rate (GBR) type services like conversational video. To solve these problems, the proposed scheme reduces the number of candidate relay users transmitting D2D SSs by applying several constraints such as requested throughput to exclude the relay users unable to satisfy the constraint. As an example of simulation results, it is observed that the proposed scheme reduces the number of D2D SSs by 96%, comparing with conventional schemes, in the case that a requested throughput from a remote user is set to 13.6 Mbps.