| 摘要 |
Using this methodology, a wireless network can be self-forming or“ad-hoc”in nature. That is, the formation of the network does not depend upon the presence of a pre-determined central coordinator. Second, it can accommodate relatively rapid changes in network configuration, including changes in the number and location of the devices participating in the network, and changes in the channel conditions experienced by communication devices. Third, it can accommodate an extended network system where the population of devices that are able to communicate wirelessly, either directly, or indirectly via devices that also act as repeaters, may be spread over a relatively large geographic area. Fourth, it can provide robust Quality of Service through the use of time reservations or“slots”during which one device or a limited number of devices are allowed to transmit. Fifth, it can provide good power management qualities, such that there are mechanisms which allow devices minimize active time and to transition in and out of reduced power“sleep”states while still maintaining the ability to communication.
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