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Apparatus, and an associated method, by which to select the size of a contention window within which to transmit a packet of data upon a random access channel in a multi-user scheme. The number of time slots allocated to form random access channels in a frame is selectably variable in a dynamic mann

Apparatus, and an associated method, by which to select the size of a contention window within which to transmit a packet of data upon a random access channel in a multi-user scheme. The number of time slots allocated to form random access channels in a frame is selectably variable in a dynamic manner. Advantage is made of the dynamic allocation of random access channels to select the size of the contention window. Operation is advantageously implemented in a mobile terminal operable in a wireless LAN (local area network), such as that set forth in the BRAN (broadband access network) promulgated by the ETSI.

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[ What is claimed is:] [1.]1. Apparatus for selecting a contention window within which to transmit a packet of data at a sending terminal to a receiving station, the packet of data transmittable upon a random access channel defined in a time-division communication system in which frames, each formed

[ What is claimed is:] [1.]1. Apparatus for selecting a contention window within which to transmit a packet of data at a sending terminal to a receiving station, the packet of data transmittable upon a random access channel defined in a time-division communication system in which frames, each formed of a plurality of time slots, are defined, the frames having a dynamically-allocable number of time slots forming random access channels, said apparatus comprising:a detector coupled to receive indications of the number of time slots allocated to form the random access channels of the frames, said detector for detecting the number of time slots allocated to form the random access channels of at least a selected frame;a contention window selector coupled to receive indications of detection by said detector of the number of time slots allocated to form the random access channels of the selected frame, said contention window selector selectably operable to select a size of the contention window responsive, at least in part, to the number of time slots detected by said detector.