Relay Performance Analysis of TTR and STR Relay Modes in IEEE 802.16j MMR System
The IEEE802.16j standard uses non-transparent relay stations to extend coverage. There are two types of nontransparent relay modes, that is, the Time-division Transmit and Receive (TTR) relay mode which can operate with one of two types of frame structures, a single-frame and multi-frame structure, and the Simultaneous Transmit and Receive (STR) relay mode. In this paper, the authors analyze the relay performance of TTR and STR relay modes in IEEE 802.16j MMR system. They also propose a fair resource allocation scheme for the downlink relay frame. Numerical results show that relay performance of the TTR with a single-frame or a multi-frame structure and that of the STR relay modes are almost the same in a two-hop system.