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Synopsis Presentation: Buffer-Aided Cooperative Communication in Wireless Networks

Authors:
Buffer-Aided Cooperative Communication in
Wireless Networks
Hina Nasir (136-FBAS/PHDCS/F15)
Ph.D. PROPOSAL DEFENSE
Supervisor: Dr. Nadeem Javaid, Associate Professor, CIIT, Islamabad
Co- Supervisor: Dr. Husnain Naqvi, FBAS, IIU, Islamabad
Department of Computer Science and Software Engineering,
International Islamic University, Islamabad
December 28, 2017
Agenda
Introduction
Related work
Problem statement
Proposed methodology
2
Introduction: Cooperative communication
A network of source (S), destination (D) and relay (R)
Relay assists source in transmitting data
Relaying technique:
Amplify and Forward (AF)
Decode and Forward (DF)
Advantages:
High throughput
Coverage
Reliability
Drawbacks:
Fix transmission schedule limits the diversity gain
Additional resources required
3
Figure 1: Cooperative communication system
Buffer-aided cooperative communication
Packets are temporarily stored at R
Advantages:
Diversity gain
Reduced outage probability
Challenges:
Channel state information
Buffer state information
Delay
4
Figure 2: Buffer-aided cooperative communication system
Related works (1/4)
Max-max relay selection scheme [1]
Selection of best SR link in odd time-slot
Selection of best RD link in even time-slot
Achievements:
Improved outage probability
Drawbacks:
Full diversity is not achieved
Buffer status is not considered
Increased delay
Variants of max-max relay selection scheme:
SILO [2]
Link quality is ignored in relay selection
Hybrid of max-max and max-link [3]
Buffer status is not considered
[1] A. Ikhlef, D. S. Michalopoulosand R. Schober, "Max-Max Relay Selection for Relays with Buffers," in IEEE Transactions on Wireless Communications, vol. 11, no. 3, pp. 1124-1135, March 2012.
[2] S. L. Lin and K. H. Liu, "Relay Selection for Cooperative Relaying Networks With Small Buffers," in IEEE Transactions on Vehicular Technology, vol. 65, no. 8, pp. 6562-6572, Aug. 2016.
[3] M. Oiwa, C. Tosa and S. Sugiura, "Theoretical Analysis of Hybrid Buffer-Aided Cooperative Protocol Based on MaxMax and MaxLink Relay Selections," in IEEE Transactions on Vehicular Technology, vol. 65, no.
11, pp. 9236-9246, Nov. 2016.
5
Figure 3: Buffer-aided cooperative communication with multiple relays
Related works (2/4)
Max-link relay selection scheme [4]
Selection of best available link
Achievements:
Full diversity gain
Improved outage probability
Drawbacks:
Large queueing delay
Buffer status is not considered
[4] I. Krikidis, T. Charalambous, and J. S. Thompson, “Buffer-aided relay selection for cooperative diversity systems without delay constraints”, IEEE Transactions on Wireless Communications, vol. 11, no. 5, pp. 1957-1967,
2012.
6
Figure 4: Buffer-aided cooperative communication with multiple relays
Related works (3/4)
Variants of max-link relay selection scheme:
Modified max-link [5]
Buffer status is ignored
Max-SNR[6]
Large queueing delay
Buffer status is ignored
Max-weight[7]
Complex Markov chain analysis required
Link quality is ignored in relay selection
Random link selection in case of same weight
Buffer state based relay selection [8]
High computational overhead
[5] T. Charalambous, N. Nomikos, I. krikidis, D. Vouyioukas, and M. Johansson, “Modeling buffer-aided relay selection in networks with direct transmission capability”, IEEE Communications Letters, vol. 19,no. 4, pp. 649-652,
2015.
[6] ] Z. Tian, G. Chen, Y. Gong, Z. Chen, and J. A. Chambers, “Buffer-aided max-link relay selection in amplify-and-forward cooperative networks”, IEEE Transactions on Vehicular Technology, vol. 64,no. 2, pp.553-565,2015.
[7] P. Xu, Z. Ding, I. Krikidis, and X. Dai, “Achieving Optimal Diversity Gain in Buffer-Aided Relay Networks With Small Buffer Size”, in IEEE Transactions on Vehicular Technology, vol. 65,no.10,pp.8788-8794, Oct. 2016.
[8] S. Luo, and K. C. Teh, “Buffer State Based Relay Selection for Buffer-Aided Cooperative Relaying Systems”, IEEE Transactions on Wireless Communications, vol. 14,no.10,pp.5430-5439,2015.
7
Figure 4: Buffer-aided cooperative communication with multiple relays
Related works (4/4)
Dual-hop packet selection scheme [9]
Large packet delay
Limited diversity order
Inverse channel packet matching:
Packets that experienced bad channel conditions in S-R hop go through good channel conditions
in R-D hop and vice versa
[9] G. Li, C. Dong, D. Liu, G. Li, and Y. Zhang, “Outage analysis of dual-hop transmission with buffer aided amplify-and-forward relay”, 2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall). IEEE, 2014.
8
Figure 5: Buffer-aided cooperative dual-hop network
Motivation
Most of the literature [1-8] focus on relay selection in a multi-relay cooperative system
Achieves spatial diversity only
AF-dual-hop [9] focuses on packet selection using single relay cooperative system
Achieves packet diversity only
Diversity is a function of number of relays only
Bigger the diversity gain bigger is the cost of relays and bigger is the delay
Can the diversity gain be a function of both the number of relays and buffer size?
How can we look at buffers so that diversity gain become the function of buffer size
also?
Can we achieve spatial diversity and packet diversity at the same time?
10
Problem statement
Exploit conventional relaying
A suite of buffer-aided cooperative communication schemes
Packet selection
Increase packet diversity
Relay selection
Increase diversity gain
Reduce outage probability
Reduce delay
Jointly explore packet and relay selection
Increase packet diversity
Increase spatial diversity
Reduce outage probability
Reduce delay
11
Proposed solution
Random access buffers
Virtual relaying
Each buffer location acts as a virtual relay
Pair of virtual links exist between S and virtual relay and D
Markov chain to model the evolution of each buffer status
Performance metrics: Outage probability, delay and diversity gain
Comparison: max-link and max-max
Results verification via theory and simulations
12
Figure 6: Proposed system model for buffer-aided cooperative
communication scheme
Proposed methodology
Topics
to be explored
Comments
Task
-1
Literature
review to understand
and
identify
bottlenecks in the
current
schemes
Exploring the existing literatures on traditional and buffer-
aided
cooperative communication schemes.
Review of the latest literatures on Buffer-aided relaying techniques
and
their scope.
Comparative analysis of schemes.
Idea generation and problem definition.
Task
-2
Reproduce
analytical and
simulation
results
of related articles.
Understanding the working principle of existing shortlisted
techniques
and learning analytical and simulation tools.
Investigate the possibilities of extending existing methodologies.
Task
-3
Analytical
derivation and simulation
of
proposed
schemes.
Performance analysis of buffer-aided schemes by using
mathematical
tools such as probability, theory of order statistics and Markov Chain.
Simulations and analysis of the proposed schemes.
Task
-4
Comparative
analysis
Analysis of the research outcome in comparison with existing schemes.
Task
-5
Dissertation
Thesis write up and
Thesis defense.
13
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