Method and apparatus for restricting radio access to a system
    1.
    发明授权
    Method and apparatus for restricting radio access to a system 有权
    限制对系统的无线电接入的方法和装置

    公开(公告)号:US08914699B2

    公开(公告)日:2014-12-16

    申请号:US13459882

    申请日:2012-04-30

    摘要: A first subscriber unit (SU) operating in a two-way radio frequency (RF) communications system having at least one fixed terminal, one or more channels, and a plurality of subscriber units, generates a first burst of data for transmission to the at least one fixed terminal. The first SU calculates a cyclic redundancy check (CRC) or checksum value over (i) at least a first portion of the first burst of data and (ii) at least a portion of a first private data. The first SU transmits the first burst of data and the calculated CRC/checksum value, but not the first private data, to the at least one fixed terminal. The fixed terminal then calculates its own CRC/checksum over the received burst and its own copy of the first private data, and compares the result with the received CRC/checksum. The fixed terminal authenticates the received burst if the values match.

    摘要翻译: 在具有至少一个固定终端,一个或多个信道和多个用户单元的双向射频(RF)通信系统中操作的第一用户单元(SU)生成第一数据突发以传输到 至少一个固定终端。 第一SU在(i)第一数据突发的至少第一部分和(ii)至少一部分第一私有数据之后计算循环冗余校验(CRC)或校验和值。 第一SU将第一个数据突发和计算的CRC /校验和值发送到至少一个固定终端,而不是第一私有数据。 然后,固定终端在接收的脉冲串及其自己的第一私人数据的副本上计算其自己的CRC /校验和,并将结果与​​接收的CRC /校验和进行比较。 如果值匹配,则固定终端对接收到的突发进行认证。