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公开(公告)号：US5287384A
公开(公告)日：1994-02-15
申请号：US961787
申请日：1992-10-15
IPC分类号： H04B7/26 , H04B1/713 , H04L12/28 , H04W28/04 , H04W36/08 , H04W48/08 , H04W56/00 , H04W74/00 , H04L9/00
CPC分类号： H04B1/7143 , H04B1/713 , H04B1/7156 , H04B7/2621 , H04B2001/71563 , H04W36/08 , H04W48/08 , H04W56/00 , H04W74/00
摘要： A frequency hopping spread spectrum wireless data communications network is disclosed. Time mark frames are transmitted by each base station at a regular cadence and each time mark frame contains all information necessary to determine the hopping sequence of channels, a sub-set of possible channels in use, and the particular channel upon which the time mark was transmitted. Receipt of the time mark resynchronizes a slot clock that is used by the wireless terminals in implementing a media access protocol with defined synchronous time slots. The base station to roaming terminal radio link is half duplex. Each base station broadcasts an end-of-message frame during a hop period that indicates that it has no more data to send during that hop. If there are no inbound messages a roaming terminal needs to send, it puts its receiver in a low power mode until the next hop time approaches. Look ahead acquisition of the hopping sequence for a nearby base station when the received signal level for the current base station drops is also disclosed.
摘要翻译： 公开了跳频扩频无线数据通信网络。 每个基站以规则的节奏发送时标帧，并且每次标记帧包含确定信道的跳频序列所必需的所有信息，正在使用的可能信道的子集，以及时间标记为 传输。 时间标记的接收在实现具有定义的同步时隙的媒体访问协议的情况下重新同步无线终端使用的时隙时钟。 漫游终端无线链路的基站是半双工。 在跳跃期间，每个基站广播消息结束帧，其指示在该跳跃期间它没有更多的数据要发送。 如果没有漫游终端需要发送的入站消息，则将其接收机置于低功率模式，直到下一跳接近。 当公开当前基站的接收信号电平下降时，向前查看附近基站的跳频序列。
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公开(公告)号：US5386435A
公开(公告)日：1995-01-31
申请号：US145406
申请日：1993-10-29
IPC分类号： H04B7/26 , H04B1/713 , H04L12/28 , H04W28/04 , H04W36/08 , H04W48/08 , H04W56/00 , H04W74/00 , H04L9/00
CPC分类号： H04B1/7143 , H04B1/713 , H04B1/7156 , H04B7/2621 , H04B2001/71563 , H04W36/08 , H04W48/08 , H04W56/00 , H04W74/00
摘要： A frequency hopping spread spectrum wireless data communications network is disclosed. Time mark frames are transmitted by each base station at a regular cadence and each time mark frame contains all information necessary to determine the hopping sequence of channels, a sub-set of possible channels in use, and the particular channel upon which the time mark was transmitted. Receipt of the time mark resynchronizes a slot clock that is used by the wireless terminals in implementing a media access protocol with defined synchronous time slots. The base station to roaming terminal radio link is half duplex. Each base station broadcasts an end-of-message frame during a hop period that indicates that it has no more data to send during that hop. If there are no inbound messages a roaming terminal needs to send, it puts its receiver in a low power mode until the next hop time approaches. Look ahead acquisition of the hopping sequence for a nearby base station when the received signal level for the current base station drops is also disclosed.
摘要翻译： 公开了跳频扩频无线数据通信网络。 每个基站以规则的节奏发送时标帧，并且每次标记帧包含确定信道的跳频序列所必需的所有信息，正在使用的可能信道的子集，以及时间标记为 传输。 时间标记的接收在实现具有定义的同步时隙的媒体访问协议的情况下重新同步无线终端使用的时隙时钟。 漫游终端无线链路的基站是半双工。 在跳跃期间，每个基站广播消息结束帧，其指示在该跳跃期间它没有更多的数据要发送。 如果没有漫游终端需要发送的入站消息，则将其接收机置于低功率模式，直到下一跳接近。 当公开当前基站的接收信号电平下降时，向前查看附近基站的跳频序列。
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