| 摘要 |
Synchronous reconfiguration of a radio link existing between an UMTS terrestrial radio access network (UTRAN) and a user equipment (UE) entails at each involved network element the reconfiguration of all internal and external resources (that is, at the interfaces) for sustaining transport connections according to the new radio bearer configuration. As a first reconfiguration step, the Serving Radio Network Controller (SRNC) sends to a Drift RNC (DRNC) a RNSAP: RL RECONF COMMIT message appositely modified to convey two independent Activation Time IEs. A first one indicates to the Node B (and the UE) the frame number (CFN) to switch to the new configuration. The second one, derived by a time reference common to SRNC and DRNC, indicates to DRNC the frame number to switch to the new configuration. The second IE is always included when the transport connections at the lur interface are based on IP protocol. The DRNC in its turn sends to the Node B a RL RECONF COMMIT message NBAP deprived of the second Activation Time IE. The Node B, upon the reception of said NBAP message, waits for the frame number indicated by the first Activation Time IE and switches to the new configuration.
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