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Cooperative MIMO is a key technology for next generation mobile communications. This technique is used to improve cell edge throughput performance. In this paper, we propose a cooperative MIMO scheme with FFR, and evaluate downlink performance of the scheme. We use 3 sector structures per cell. The sector cell is divided into two regions, inner cell and outer cell. The frequency reuse factor (FRF)...
In IEEE 802.16 uplinks, the permutation of data on a frequency domain is performed when logical subchannels are transformed to physical subchannels to scatter deterioration of the radio propagation environment via inter-cell interference. However, it is ideal from the viewpoint of evading interference to completely divide the radio resource between the interfering cells, when there is comparatively...
In this paper, we propose a Quality of Service (QoS) packet scheduling algorithm for the IEEE 802.16 system and evaluate the algorithm on hardware. The proposed algorithm controls packets based on a deadline for each packet determined from QoS parameters. The feature of our algorithm is that it can simply control the various QoS classes defined in the standard using the deadline. As a result, QoS...
In this paper, we present a multihop mobile communications system utilizing fixed relay stations to enhance the coverage of the service area. A multihop mobile communications system was originally proposed as a system in which only mobile stations relay communication between other mobile stations and a base station to solve the problem of poor coverage expected in a future cellular system. In the...
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