초록 ▼

Personal communications in a code division multiple access system operated without a base is provided with simultaneous transmission of a communications channel and a control channel, each spread by different PN codes. The PN code facilitates restricting communications on the network to a particular

Personal communications in a code division multiple access system operated without a base is provided with simultaneous transmission of a communications channel and a control channel, each spread by different PN codes. The PN code facilitates restricting communications on the network to a particular conversation mode and between identified radios. Transmissions are performed in a time division duplex manner in 62.5 milliseconds slots. One of the radios initiates transmission and maintains power control and time synchronization normally done by a base station. A network control station can voluntarily or by command transfer control of the network to any of the other radios on the network. Colliding transmissions from more than one radio require the radios to retry transmitting until one of the radios transmits in an earlier time slot. Conversational mode capability is provided by equipping the radio receivers with despreaders in parallel for permitting a receiving radio to separately despread the simultaneously transmitted signals all other radios on the network and responding to each radio transmission individually. Simultaneous voice and data communications can be accomplished by equipping the receivers with despreaders for discriminating voice and data information signals spread by different PN codes.

대표청구항 ▼

[ We claim:] [1.] In a method for communicating by multiple subscribers in a code division multiple access system without a base station, each of said multiple subscribers transmitting communication information modulated by a PN code through an information channel, in combination therewith the impro

[ We claim:] [1.] In a method for communicating by multiple subscribers in a code division multiple access system without a base station, each of said multiple subscribers transmitting communication information modulated by a PN code through an information channel, in combination therewith the improvement comprising the additional steps of:simultaneously transmitting with said communication information control information through a control channel, from an initiating subscriber, for selectively controlling communications between said multiple subscribers; and,modulating said control information by another PN code.