| 摘要 |
The present invention relates to a mobile communication system comprising a rate adaptation unit (TC) which communicates with a base station system via first data transmission channels (Ater1 - Ater4) and with a mobile services switching centre (MSC) via second data transmission channels (A1 - A4). To enable available data transmission capacity to be utilized as flexibly as possible, the base station system comprises: allocation means (7) which keep a record of the first data transmission channels (Ater1 - Ater4) and which are responsive to a message sent by the mobile services switching centre (MSC) for allocating one or more free first data transmission channels (Ater2, Ater4) for the call, and transmission means (8) which are arranged to send the mobile services switching centre (MSC) a message which indicates which second data transmission channel (A2) the rate adaptation unit (TC) selects for the call when the allocation means (7) have allocated one or more first data transmission channels (Ater2, Ater4) for the call.
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