| 摘要 |
In a cellular communication system (10), such as an EDGE Compact system supporting discontinuous downlink control channel transmissions (12), a multiframe control channel (100) contains a multiplicity of signalling blocks (B0-B11) partitioned by bursts associated with frequency correction (CFCCH) and synchronisation (CSCH). A scanning subscriber unit (64-70) wishing to access the cellular system (10) is designed to take power measurements of an incident frequency environment to identify a cell capable of providing service to the subscriber unit. With downlink control channel transmissions sent at full power by a serving base station (42-56), the multiframe (100) is structured to ensure that signalling blocks (B0, B3, B6, B9) are regularly transmitted throughout the multiframe (100). Additionally, with regard to particularly significant control signalling blocks, such as those of a broadcast control (CPBCCH) and a paging (CPCCH) nature, these are sequenced into the multiframe (100) such that any variation in a basic distribution of such control blocks in the multiframe follows an underlying pattern. In other words, in relation to CPBCCH and CPCCH logical channels, there is a fixed allocation scheme of control signalling block transmissions, although interlacing may vary the exact content of each block according to a defined transmission sequence between CPBCCH and CPCCH. |
