Regenerative Strategy for Fairness in Bi-directional Three-Node Relaying

Hu, Ning; Zhong, Xiaofeng; Zhao, Ming; Jing, Wang

doi:10.1093/ietcom/e91-b.8.2736

Cited by 2 publications

(1 citation statement)

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“…A number of studies have assumed symmetric traffic or have not assumed a specific traffic ratio. In [9], the authors proposed a regenerative strategy to improve the fairness, i.e., to maximize the minimum unidirectional transmission rate. In [5]- [8], only the total throughput enhancement is discussed; the throughput ratio for each direction is not considered.…”

Section: Introductionmentioning

confidence: 99%

Impact and Use of the Asymmetric Property in Bi-directional Cooperative Relaying under Asymmetric Traffic Conditions

Saeki

Yamamoto

Murata

et al. 2010

IEICE Trans. Commun.

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Cooperative relaying (CR) is a promising technique to provide spatial diversity by combining multiple signals from source and relay stations. In the present paper, the impact and use of the asymmetric property in bi-directional CR under asymmetric traffic conditions are discussed assuming that CR involves one communication pair and one relay station in a time division duplex (TDD) system. The asymmetric property means that the average communication quality differs for each transmission direction because of the difference in signal power between the combined signals for each direction. First, numerical results show the asymmetric property of bi-directional CR. Next, in order to evaluate the impact of the asymmetric property, the optimal relay position and resource allocation are compared to those in simple multi-hop relaying, which does not have the asymmetric property. Numerical results show that, in order to maximize the overall quality of bi-directional communication, the optimal relay position in CR depends on the offered traffic ratio, which is defined as the traffic ratio of each transmission direction, while the offered traffic ratio does not affect the optimal relay position in multi-hop relaying. Finally, the asymmetric property is used to enhance the overall quality. Specifically, a high overall quality can be achieved by, for example, opportunistically switching to the transmission direction with higher quality. Under asymmetric traffic conditions, weighted proportionally fair scheduling (WPFS), which is proposed in the context of downlink scheduling in a cellular network, is applied to transmission direction switching. Numerical results reveal that WPFS provides a high overall quality and that the quality ratio is similar to the offered traffic ratio.

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Section: Introductionmentioning

confidence: 99%