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IEEE 802.16j mobile multi-hop relay network is proposed to enhance the system coverage, user throughput and the capacity of fixed/mobile broadband wireless access system in IEEE 802.16d/802.16e. Relay station (RS) enables data transmission between base station and end user when the channel is not good for transmission. Besides, one relay station also communicates with a pair of other relay stations...
In a mobile cellular network, both new originating calls and handoff calls can be dropped at any time in the midst of a conversation when a user enters in a dead spot. Because of this, there is always some discrepancy between traffic originated by the mobile station (MS) and that of received by the base station (BS). A probability model is used in this paper to evaluate this discrepancy considering...
IEEE 802.16j multi-hop relay task standard includes two mutually exclusive options: transparent relay stations (T-RS) and non-transparent relay stations (NT-RS). In this work, a system design approach is proposed to compare different relay systems in term of their capacity with rate fairness constraint among the mobile stations (MS). Single-input single-output (SISO) and multi-input multi-output (MIMO)...
Traditionally, every mobile station (MS) riding in the mobile vehicle uses conventional connection to the base station (BS). However, in 802.16j mobile multihop relay (MMR) networks, one of the studied usage model is ldquocoverage on mobile vehiclerdquo. Therein, a relay station (RS) is mounted on a vehicle. The RS provides service to MSs riding on the vehicle by relaying their data to the mobile...
WIMAX has been approved by IEEE 802.16 as a standard to provide a highly data rate transmission, This paper describe a problem in the mesh network relay station, for instance the problem of how to serve the mobile stations (MSs) which are out of the base station (BS) and relay station coverage. This paper also proposed a solution for mobile stations out of the coverage of the WIMAX relay stations...
Amplify-and-forward channels in cooperative networks provide a promising improvement in the network coverage and system throughput. Under line-of-sight (LOS) propagation conditions in such cooperative networks, the overall fading channel can be modeled by a double Rice process. In this article, we have studied the statistical properties of the capacity of double Rice fading channels. We have derived...
This paper proposes an optimization of management messages and their exchange during a scanning procedure of mobile stationpsilas neighborhood in WiMAX based networks with relay stations. The scanning procedure allows a mobile station to obtain information about handover target access stations. In IEEE 802.16e standard, where the relay stations are not considered, the exchange of requested information...
This paper considers the ranging process of IEEE 802.16 system in relay system. An interference problem between MS-BS ranging (i.e. ranging between mobile station and base station) and MS-RS ranging (i.e. ranging between mobile station and relay station), which is caused by the introduction of relay systems, is addressed. A solution of the interference problem is provided by proposing a new transmit...
Wireless mesh network is currently attracting much attention as a new wireless broadband access technology due to numerous benefits. This work proposes a power control scheme for WiMAX multihop relay system. In contrast to existing power control and optimization approaches, our proposed method uses an adaptive power control (APC) approach for a relay station to reduce interferences to other mobile...
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