| 摘要 |
The invention relates to a method of performing contention resolution for dedicated channel reservation of a cellular radio network air interface (170), a network part (128) of the cellular radio network, and a subscriber terminal (150) of the cellular radio network. (404) The network part (128) captures a random access request message (acc_req) transmitted on a random access channel by the subscriber terminal (150). (406) The network part (128) transmits an access grant message (acc_gra) on an access grant channel to the subscriber terminal (150). (408, 410) At least one subscriber terminal (150) receives the access grant message (acc_gra) on the access grant channel and on the basis thereof assumes having reserved a dedicated channel. (412, 416) The network layer of at least one subscriber terminal (150) transmits on the dedicated channel a network layer service request message (d MS1), which contains the subscriber terminal (150) identifier, to the network layer of the network part. In accordance with the invention, the contention is resolved in such a way that (420) the radio network sublayer included in the network layer of the network part (128) transmits on the dedicated channel a response message (cont_res MS1), which contains the subscriber terminal (150) identifier to the radio network sublayer of the subscriber terminal (150). Thereafter, (422,424) the radio network sublayer of at least one subscriber terminal (150) compares the subscriber terminal (150) identifier included in the response message (cont_res MS1) received on the dedicated channel with its own identifier, and (422) if the identifiers are identical, it concludes that the channel reservation succeeded, and (424) if the identifiers are different, it concludes that the channel reservation failed.
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