| 摘要 |
PCT No. PCT/GB93/01749 Sec. 371 Date Apr. 4, 1995 Sec. 102(e) Date Apr. 4, 1995 PCT Filed Aug. 18, 1993 PCT Pub. No. WO94/05107 PCT Pub. Date Mar. 3, 1994A digital time-division duplex radio communication link is established or re-established between one of a plurality of portable units and one or more base units forming a cordless telephone system, so as to avoid potential interference created by the use of an unsynchronized call-up transmission in the presence of synchronized signals being exchanged by the rest of the system. The call-up transmission is pre-synchronized with the rest of the system so that switchovers between transmission bursts and reception windows occur at the same time as between the call-up signal and the rest of the system. This is achieved by deriving synchronization information from a synchronization signal which may, for example, be an existing signal on the system containing synchronization information (i.e., an existing call on the system) or may be a beacon signal which, in some systems, is transmitted by the fixed units for the purpose of range indication. The method is particularly applicable to the MUX1/MUX2/MUX3 format of signals used in the CT2 common air interface protocol.
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