发明名称 |
APPARATUS AND METHOD FOR REDUCING MESSAGE COLLISION BETWEEN MOBILE STATIONS SIMULTANEOUSLY ACCESSING A BASE STATION IN A CDMA CELLULAR COMMUNICATIONS SYSTEM |
摘要 |
Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station in a CDMA system uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time-delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence. |
申请公布号 |
US2007111680(A1) |
申请公布日期 |
2007.05.17 |
申请号 |
US20070622383 |
申请日期 |
2007.01.11 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
TIEDEMANN EDWARD G.JR.;WEAVER LINDSAY A.JR.;PADOVANI ROBERTO |
分类号 |
H04B1/00;H04B1/04;H04B1/707;H04B7/26;H04B15/00;H04J13/00;H04J13/10;H04J13/16;H04L1/16;H04L12/28;H04L12/403;H04L12/413;H04L27/30;H04W52/48;H04W52/50;H04W74/08 |
主分类号 |
H04B1/00 |
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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