| 摘要 |
A radio message format for communicating between a mobile terminal and a radio access network (RAN), such as the UMTS terrestrial RAN (UTRAN), according to a radio protocol, such as the radio resource control (RRC) protocol. The radio message comprises a basic message portion 101 corresponding to a first version of the radio protocol, blocks of extension data 102-105 each relating to subsequent versions of the protocol, and an extension container 130 including extension blocks 132-134 relating to more than one subsequent version of the protocol. As the radio protocol is developed and improved, all late protocol extensions 132-134 introduced after the subsequent protocol release is frozen are stored in the single variable length extension container (VLEC) 130 in order according to the date of introduction of the extensions. By using a single VLEC for all late extensions, the overhead from multiple VLECs is avoided.
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