05.023GPPMultiplexing and Multiple Access on the Radio PathTS
The service selected will impose certain restrictions on the allowed combinations of transmit and receive timeslots. Such restrictions are not imposed by this annex but should be derived from the description of the services. For example, in the case of circuit switched data the TS numbers used in the uplink will be a subset of those used in the downlink.
The service selected will determine whether or not adjacent cell power measurements are required and therefore whether Tra or Trb is allowed for.