发明名称 |
Use of duplex cipher algorithms for satellite channels with delay |
摘要 |
An apparatus and method for ciphering traffic exchanged in both directions between a satellite/cellular telephone and a ground station network using an orbitial satellite. A buffer memory is provided at either the mobile telephone station or the ground network station or both. The buffer memory is used to store the deciphering bits output from a duplex ciphering algorithm at the time the ciphering bits are generated. The stored ciphering bits are used to decipher a later-to-be-received traffic information block. The delay in using stored deciphering bits is determined for each call at call set-up to the nearest integer number of block periods by measuring the loop propagation delay from the ground station to the mobile telephone station during an exchange of signals at call set-up. <IMAGE> |
申请公布号 |
AU4417397(A) |
申请公布日期 |
1998.05.11 |
申请号 |
AU19970044173 |
申请日期 |
1997.09.19 |
申请人 |
ERICSSON INC. |
发明人 |
PAUL W. DENT |
分类号 |
H04L9/08;H04B7/15;H04B7/185;H04L9/12;H04L9/18;H04Q7/22;H04Q7/24;H04Q7/26;H04Q7/30 |
主分类号 |
H04L9/08 |
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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