首页>
外国专利>
Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system
Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system
展开▼
机译:用于减少在CDMA蜂窝通信系统中同时访问基站的移动站之间的消息冲突的装置和方法
展开▼
页面导航
摘要
著录项
相似文献
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.
展开▼