5B.2 Frame structure

25.2213GPPPhysical channels and mapping of transport channels onto physical channels (TDD)Release 17TS

The TDMA frame has a duration of 10 ms and is subdivided into 15 time slots (TS) of 5120*T_c duration each. A time slot corresponds to 5120 chips. The physical content of the time slots are the bursts of corresponding length as described in subclause 5B.3.2.

Each 10 ms frame consists of 15 time slots, each allocated to either the uplink or the downlink (figure 18AB). With such a flexibility, the TDD mode can be adapted to different environments and deployment scenarios. In any configuration at least one time slot has to be allocated for the downlink and at least one time slot has to be allocated for the uplink with the exception of no uplink timeslots when the entire carrier is dedicated to MBSFN.

Figure 18AB: The TDD frame structure

Examples for multiple and single switching point configurations as well as for symmetric and asymmetric UL/DL allocations are given in figure 3.