Question: In UTRAN's Iur interface, when multiple coordinated Dedicated Channels (DCHs) require a new transport bearer, how should the Transport Layer Address and Binding ID be handled within the RL Specific DCH Information IE?
Option 1: Include both IEs for each DCH in the set of coordinated DCHs to ensure individual addressing.
Option 2: Exclude both IEs for all DCHs in the set, as they are implied by the initial DCH setup.
Option 3: Include both IEs only for one of the DCHs in the set of coordinated DCHs, as specified for new transport bearers.
Option 4: Alternate including and excluding these IEs among the DCHs to balance resource allocation.
Explanation: This is correct because, according to the specification, when a set of coordinated DCHs requires a new transport bearer on Iur, efficiency and clarity are maintained by only including the Transport Layer Address IE and the Binding ID IE for one of the DCHs in the set. This approach avoids redundant information while ensuring the necessary setup for the new transport bearer.