发明名称 |
Method and apparatus for coding messages communicated between a primary station and remote stations of a data communications system |
摘要 |
A data communications system is described in which variable length messages are communicated between a general communications controller (GCC) and a plurality of portable and mobile radios. The variable length messages include a bit synchronization field, a message synchronization field and a plurality of channel data blocks for efficiently and reliably handling long strings of data or text. Each channel data block includes an information field, a parity field for error-connecting the information field and a channel state field indicating whether or not the radio channel is busy or free. The GCC is coupled to a cellular arrangement of channel communications modules (CCM's), which each include a radio transmitter and/or radio receiver. The mobile and portable radios communicate with the GCC by way of the CCM's.
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申请公布号 |
US4517669(A) |
申请公布日期 |
1985.05.14 |
申请号 |
US19830512800 |
申请日期 |
1983.07.11 |
申请人 |
MOTOROLA, INC. |
发明人 |
FREEBURG, THOMAS A.;KREBS, JAY |
分类号 |
H04L1/00;H04L1/18;H04W28/04;(IPC1-7):H04J3/16 |
主分类号 |
H04L1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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