| 摘要 |
This invention is about a method to reduce the near-far effect in the physical and media access control (MAC) layer for focusing on CDMA radio technologies in ad-hoc network systems. The radio resource is first organized and separated into small pieces, divided in both frequency domain (FDMA) and in time domain (TDMA). Each radio resource is considered as a physical radio channel (PRC). Any node in the network can dynamically allocate it. The near-far effect will be mitigated in each PRC, which is used for supporting a set of CDMA based sub-channels. The selection of the TX and RX PRC depends on which small geographical area (SGA) the node is located. As the nodes in the same SGA share the same PRC as the preferred and designated receiving PRC, power control is possible in a neighborhood of multiple SGA. Each SGA is viewed as a virtual base station regarding a designated PRC as the uplink channel. And each PRC provides a multiple sub-channels via the CDMA method. Adopting this Listening Frequency and Resource Planning (LFRP) can substantially increase the ad-hoc network capacity, by limiting the near-far effect in CDMA channels.
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