| 摘要 |
A wireless communication system has a plurality of base stations (1), a plurality of mobile vehicular repeater units (2, 8), and a plurality of portable units (3, 9). In a typical context, each mobile vehicular repeater unit (2, 8) is associated with at least one portable unit (3, 9), and both may be associated with a single user. The object is for the user(s) of the portable units (3, 9) to be able to access the wireless system from any geographic location. In cases where a geographic area is shadowed from a base station (1) and communication directly between the portable unit (3, 9) and the base station (1) is not possible, it is beneficial to use the mobile vehicular repeater unit (2, 8) in accordance with an extended coverage mode of operation, to relay communications between the portable unit (3, 9) and the base station (1). A mobile vehicular repeater unit (2, 8) enters the extended coverage mode of operation in response to receipt of an access request, transmitted by one of the plurality of portable units (3, 9). Responsive to that request, a mobile vehicular repeater unit (2,8) transmits to the portable unit (3, 9) a signal representative of an identification of upper and lower frequency channel portions (4b, 5b). <IMAGE> |
