Joint Relay Selection and Resource Allocation using Cooperative Network Coding
Date Issued
2010
Date
2010
Author(s)
Tang, Chih-Hsiang
Abstract
The increasing rate on ubiquitous wireless broadband access drives the development of even better wireless communication technology. Both LTE-Advanced and 802.16m, potential candidates of so-called 4G standard, are capable of reaching over-the-air 1Gbps transmission rate which is required by IMT-Advanced. Although different in certain features, they both share many common key technologies, including OFDMA, MIMO, multi-carrier, relay support, etc. Relay operation is viewed as a highly efficient way to either increase cell coverage or enhance channel condition without deployment of a new BS. However, without proper setting and better way of transmission, relay operation might not be as good as expected.
Cooperative communication is a promising communication technology developed in recent years. While it might not be possible for MS node to be equipped with several antennas, as MIMO requested, cooperative communication forms a virtual MIMO scheme through the cooperation with neighbor nodes. Theoretically proven, cooperative communication could not only increase system capacity, but enhance reliability. Network coding is another promising technology that attracts many researches. To encode receiving packets by XOR operation, network coding could largely reduce transmission time, so as to increase system throughput.
In virtue of the above reasons, we try to combine cooperative communication with network coding and apply this new mechanism to cellular relay system. Cooperative network coding (CNC) for relay system generates challenging problems, among which relay selection might be the most important one. How to choose relay station (RS) to incorporate CNC remains a difficult problem. In the following article, we use relay station and RS alternately. Moreover, this work is highly associated with resource allocation problem. Hence, we propose a joint relay selection and resource allocation problem with precise formulation. Then, an algorithm is proposed to minimize the computation of original optimization problems. Finally, through computer simulation, results show that our work increase overall system capacity by a large degree.
Subjects
802.16
OFDMA
Network Coding
Cooperative Communication
Resource Allocation
Type
thesis
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