RANDOM ACCESS CHANNEL OPTIMISATION

摘要

A radio communication system has a random access channel for the transmission of data (214) from a secondary station to a primary station. Such a channel is intended for use by secondary stations having data (214) to transmit to a primary station while not actually engaged in a call. Before the transmission of its data (214), a secondary station transmits a message (302) which provides information on the length of the data transmission (214), and may include format information relating to the data (214). This scheme is particularly effective when combined with a scheme signalling availability of random access channel resources, for example by use of an availability (AV) message (402). In this case a primary station can signal future availability of resources which are currently in use.