LTE TDD Frame Configuration Planner

TS 36.211 Table 4.2-2 defines seven, numbered 0 to 6, each a fixed pattern of downlink (D), special (S) and uplink (U) subframes across the 10 ms frame. With the downlink and uplink subframe counts they are: 0, DSUUUDSUUU, 2 and 6; 1, DSUUDDSUUD, 4 and 4; 2, DSUDDDSUDD, 6 and 2; 3, DSUUUDDDDD, 6 and 3; 4, DSUUDDDDDD, 7 and 2; 5, DSUDDDDDDD, 8 and 1; 6, DSUUUDSUUD, 3 and 5. Configurations 0, 1, 2 and 6 have two special subframes and switch every 5 ms; 3, 4 and 5 have one and switch every 10 ms.

TS 36.211 Table 4.2-1 defines configurations 0 to 10 for a normal cyclic prefix and 0 to 7 for an extended one. Each splits the 1 ms special subframe into DwPTS, the guard period and UpPTS. With a normal cyclic prefix and no additional SRS symbols, the guard period runs from 2192 Tₛ in configurations 4 and 8, a timing limit of 7.65 km, to 21936 Tₛ in configuration 0, where the timing advance range caps the limit at 100.09 km.

A terminal starts its uplink ahead of the downlink timing it receives, by the round trip to the base station plus a fixed 624 Tₛ offset in TDD (TS 36.211 clause 8.1), so that its signal arrives on time. The round trip and the offset both come out of the guard period, so it sets a maximum radius that is independent of signal strength. A cell that is well covered by the link budget can still fail if it is larger than this timing limit.

It is the number of additional sounding reference signal symbols in UpPTS, which TS 36.331 allows as 2 or 4, or none. Each symbol is taken from the guard period, so the timing limit drops. Some special subframe configurations cannot take additional symbols at all, and the planner reports those as not configurable.

The Determination defines a "3.4 GHz band uplink-downlink configuration" as one consistent with uplink downlink configuration 2 of TS 36.211 Table 4.2-2 and special subframe configuration 6 of Table 4.2-1. Section 39 can require a point to multipoint licensee in 3950 to 4000 MHz to adopt it where interference arises with another licensee and no agreement can be reached. The planner shows the split and timing limit of that configuration.

No. The wait figures are the part of latency set by the frame structure, which is a lower bound. Scheduling requests, grants, HARQ retransmissions, processing, transport and the core network all add to it, and full HARQ round trip timing is not calculated.