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We consider hybrid automatic repeat request with Chase combining (HARQ-CC) in a Rayleigh block-fading channel, where rate adaptation is based on long-term channel statistics instead of instantaneous channel information because the latter may be outdated. In the HARQ-CC with long-term rate adaptation, optimal selection of the transmission rate for each HARQ round requires a two-step numerical search...
In Rayleigh block fading channels which represent fast-varying channels, long-term rate adaptation is required instead of instantaneous rate adaptation because the channel information fed back may be outdated. We maximize the long-term average transmission rate (LATR) in a two-hop relay network which adopts Chase combining (CC) type Hybrid Automatic-Repeat-reQuest (HARQ). The round transmission rate,...
We propose a block scheduling (BLS) scheme which can significantly reduce signaling overhead to accommodate more users with low-rate, real-time traffic. The basic concept of the BLS scheme is to allocate the resource to each user by using resource blocks which are a basic unit of resource allocation. Since the performance of the BLS scheme depends on traffic models, we consider two types of traffic:...
Data aggregation significantly reduces signaling overhead and delay by encapsulating multiple packets in queue into an aggregated packet in uplink two-hop relaying networks. In addition, hybrid automatic repeat request (HARQ) operation increases the system throughput by retransmitting the entire or part of the packet transmitted at the initial transmission. We combine data aggregation and HARQ schemes...
Multi-hop relays will be deployed as one of the promising technologies for future cellular networks to enhance the performance of cell boundary users and to reduce deployment and operating cost. However, they have many challenges which include signaling overhead and latency in order to be practically deployed due to a hierarchical multi-hop structure, and the situation is much severer in uplink case...
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