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A 5G Virtualized RAN Based on NO stack

china Communications 2017年第6期14卷 199-208页

作者： Jie Zeng Xin su Jinjin Gong Liping Rong Jing Wang Tsinghua National Laboratory for Information science and Technology Research Institute of Information Technology Tsinghua University Beijing 100084 China

The virtualized radio access network(v RAN) could implement virtualized baseband functions on general-purpose platforms and expand the processing capacity of the radio access network(RAN) significantly.In this paper,a Not Only stack(NO stack) based vR AN is proposed to be employed in the fifth generation(5G) mobile communication system.It adopts advanced virtualization technologies to maintain flexible and sustainable.The baseband processing and storage resources should be sliced and orchestrated agilely to support multi radio access technology(multiRAT) .Also it is analyzed and demonstrated by different use cases to validate the benefits.The proposed v RAN reduces signaling overheads and service response time in the bearer establishment procedure.Concluded from the analyses and demonstrations,the NO stack based v RAN could support multi-RAT convergence and flexible networking effectively.

关键词：堆栈虚拟运行无线接入网络虚拟化技术移动通信系统无线接入技术基带处理通用平台

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A New TDD scheme and Interference-Aware Precoding for Device-to-Device underlay Massive MIMO

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china Communications 2016年第S2期13卷 100-108页

作者： Xinxin Liu Xueru Li Yunzhou Li Ming Zhao Jing Wang state Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information Science and Technology Tsinghua University Department of Electronic Engineering Tsinghua University

In device-to-device(D2D)underlay cellular networks with downlink spectrum sharing,massive MIMO seems promising as the large number of antennas at the base station(Bs) can be utilized to suppress interference.However,the channel state information(CsI) from the Bs to D2D receivers is required to obtain this advantage.In this paper,we first propose a novel time division duplex(TDD) scheme for D2D users to acquire this CsI,without additional pilot overhead.Moreover,we propose an interference-aware MMsE precoder utilizing the acquired CsI from the Bs to not only cellular users but also D2D users to suppress the cellular-to-D2D interference.simulation results show that our proposed TDD scheme and precoder can significantly improve the achievable sum spectral efficiency(sE) and D2D sE,compared to the classical MMsE precoder.Compared with the interferenceaware ZF precoder,whose performance severely degrades for large user numbers,our proposed interference-aware MMsE precoder can always guarantees a high and stable performance in terms of achievable sE.

关键词： device-to-device massive MIMO TDD scheme precoding

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Fractional full duplex cellular network: a stochastic geometry approach

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science china(Information sciences) 2018年第2期61卷 50-64页

作者： Wenping BI Limin XIAO Xin sU shidong ZHOU state Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information science and Technology Department of Electronic Engineering Tsinghua University

In-band full-duplex(FD) communication has been considered as a promising technology to enhance the spectral efficiency(sE) for the next generation of wireless system. However, the severe interference in FD cellular network may largely degrade the system performance, especially for cell edge users. In this paper, multi-cell cellular network consisting of Bss with FD capability and legacy half duplex(HD) users is studied. In order to relieve the received interference and enhance the system sE, a new resource allocation strategy named fractional FD(FFD) is proposed and its main idea and procedure are described as follows.Firstly, the frequency and time resources are partitioned into FD resource blocks(RBs) and HD RBs based on the network topology. Then all the users are classified into two groups named cell center users(CCUs)and cell edge users(CEUs) based on their channel conditions. At last, in each cell, each FD RB is allocated to a pair of CCUs with one in uplink and the other in downlink transmission direction, while only one CEU in the uplink(or downlink) transmission direction is scheduled over each HD RB. Tractable results of both the coverage probabilities and the ergodic rates of FFD, FD and HD systems are derived using stochastic geometry method. Numerical results show that, FFD can significantly improve the coverage probability of all users especially for CEUs compared with FD cellular system, and higher system sE is obtained compared with FD and HD cellular network. With proper design of the classification criterion and under the simulation settings of this paper, the sE of FFD system outperforms FD and HD system by 1.25 and 1.38 times,respectively.

关键词： full duplex half duplex stochastic geometry radio resources allocation small cell

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Editorial： special issue on ＂next generation wireless communication technologies＂

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Digital Communications and Networks 2016年第4期2卷 159-161页

作者： Tao Jiang shiwen Mao Zhifeng Zhang Da Chen Huazhong University of science and Technology PR China Auburn University USA Tongji University PR China

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