Protocol Design and Analysis for Cooperative Wireless Networks by Wei Song Peijian Ju & A-Long Jin

Author:Wei Song, Peijian Ju & A-Long Jin
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(4.3)

where is the packet delay, is the acceptable upper bound, and ɛ is a small probability that is allowed for QoS violation.

4.3 Energy-Aware Cooperation Strategy

4.3.1 Cooperation Criteria

For a backoff-based cooperation strategy, the determination of the backoff timer is critical to reduce collisions, because a collision may occur when the backoff timers of the first two or more relays expire within an indistinguishable small interval. To improve the achievable performance, the backoff timer is often based on the cooperation capability of the relay. Hence, we need to properly choose the metrics that characterize the cooperation capability, so that the backoff timers of the group of relays can be appropriately scattered to decrease the collision probability.

First, we consider the distance between a relay and a destination, which can be estimated from the location information without incurring extra cost. This distance can capture the transmission success probability of the relay-to-destination channel according to (4.2). This is because we are interested in the potential relays that have correctly overheard the packet from the source and thus only focus on the relay-to-destination channel condition. Denoting the distance between the relay R i and the destination D j by d ij , we define the cooperation capability of R i for D j with respect to the distance as

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