| 摘要 |
A wireless communications system includes a plurality of base stations that communicate control information with terminals at a first redundancy level over regular control channels. A subset of the plurality of base stations also communicate control information with terminals at a second redundancy level greater than the first redundancy level over high-penetration control channels. The subset of base stations may be distributed to efficiently provide service without using an inordinate amount of channel capacity. In one embodiment, cells served by the plurality of base stations may be grouped into a plurality of groups, e.g., frequency or code reuse groups, such that a respective group of base stations serves a respective group of cells. The subset of base stations may include at least one base station from each group of base stations. The subset of base stations may be geographically distributed with a greater density than the groups of cells to provide improved service to obstructed locations. A voice service may be provided to terminals access the system via a regular control channel, and a message service may be provide to terminals accessing the system via a high-penetration control channel. A terminal for communicating with a such a system includes a receiver operative to receive control information transmitted over a plurality of regular control channels and high-penetration control channels. A controller is operative to scan the receiver over the plurality of regular and high-penetration control channels and to camp the receiver on a selected regular or high-penetration forward control channel based on a measure of communications quality.
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