Power economising in multiple user radio systems.

摘要

A multiple user radio system comprising at least one primary station and a plurality of secondary stations by way of a control channel. The primary station in use sets a value, in a transmitted message from which a secondary station wanting to economise on power can derive a period during which it can switch-off at least its radio section. The radio system may comprise a radiopaging system or a radio trunking system using an Aloha protocol. In the case of a radio trunking system using an Aloha protocol, the said value comprises the Aloha number.