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An Autonomous Interference Avoidance Scheme for D2D Communications through Frequency Overhear-ing in OFDM System

Title
An Autonomous Interference Avoidance Scheme for D2D Communications through Frequency Overhear-ing in OFDM System
Translated Title
OFDM 시스템의 D2D 통신에서 주변 주파수 감지를 이용한 자동적인 간섭 회피 방식
Authors
Shin, Jae Sub
DGIST Authors
Shin, Jae Sub; Choi, Ji Woong; Choi, Hong Soo
Advisor(s)
Choi, Ji Woong
Co-Advisor(s)
Choi, Hong Soo
Issue Date
2014
Available Date
2016-05-18
Degree Date
2014. 2
Type
Thesis
Keywords
Device to device communicationinterference avoidanceD2D modesorthogo-nal frequency division multiplexing (OFDM)D2D 통신간섭 회피D2D 모드
Abstract
Device to device (D2D) communication user equipment (UE) transmits data signals to each other over a direct link instead of through the BS, which differs from femto cell where users communicate with the help of small low power cellular base stations. Since D2D has many advantages such as improvement of data rate, spectral efficiency, usability in disaster situations, and overload mitigation of base stations D2D has been spotlighted for the next generation communication technology, especially in the 5G technology. However, disadvantages remain such as interference with cellular in case of spectrum sharing mode where cellular and D2D communicate using the same resource. In the worst case, the cellular system experiences outage if the interference from the D2D pair is too much which is a main concern in this paper. The processes of D2D can be divided into three: peer discovery, link establishment, and data transmission. In this paper, we deal with the link establishment and data transmission procedures. Assuming that D2D pair is already discovered each other. When frequency resources are persistently allocated in or-thogonal frequency division multiplexing (OFDM) time division duplexing (TDD) sys-tem, we propose an autonomous interference avoiding scheme for D2D communication where resources are opportunistically shared with uplink cellular users. It does not allo-cate subchannels that nearby cellular users currently use via overhearing the signal power of uplink cellular users and calculating the interference in the frequency domain without the use of explicit control channels. With the proper decision of parameters such as the threshold, the proposed scheme can increase the total system throughput at the cost of small cellular throughput. The performance of the proposed scheme is shown through computer simulation, where a tradeoff between total system throughput and cellular only throughput are observed, and an appropriate threshold accepting new link needs to be optimized. In addi-tion, success probability of the overhearing operation is analyzed and compared to simulation results. ⓒ 2014 DGIST
Table Of Contents
Ⅰ. Introduction 4 -- Ⅱ. Basics of D2D communication 6 -- 2.1 System overview 6 -- 2.2 Usage cases 8 -- 2.2 Procedures 8 -- 2.3 Operation modes 9 -- 2.4 Power control 13 -- Ⅲ. System model 14 -- IV. Proposed scheme 15 -- 4.1 Procedures 16 -- 4.2 Analysis of overhearing success probability 18 -- V. Simulation results 21 -- 5.1 Success probability of overhearing 21 -- 5.2 System throughput 22 -- VI. Conclusions 27
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002262547
http://hdl.handle.net/20.500.11750/1355
DOI
10.22677/thesis.2262547
Degree
Master
Department
Information and Communication Engineering
University
DGIST
Files:
Collection:
Information and Communication EngineeringThesesMaster


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