Section: A.22 Use case of UE Rx–Tx time difference related measurements
Content: UE Rx – Tx time difference measurement can be used to calculate distance distribution between UE and serving eNodeB. It is useful to analyze traffic distribution in geographic area and to do trouble shooting of extending coverage and blind coverage spot. The probability of extending coverage and blind coverage should be analyzed by the ratio of the number of UE Rx – Tx time difference that is larger than or equal to threshold to the total number of it. Threshold is configurable according to the cases to be analyzed, Cases includes dense urban area macro cell, suburban area macro cell and rural area cell.So it is necessary to define the UE Rx–Tx time difference related measurements. For TDD mode, propagation distance of 1Ts is nearly 9.77m. According to optimization experience, several granularity of this measurement is proposed. Minimize granularity of 10Ts is enough to analyze distance distribution for near base station, namely UE Rx–Tx time difference is less than 200Ts. For UE Rx–Tx time difference is larger than 200Ts and less than 1000Ts, the corresponding propagation distance is from 1953m to 9766m, the granularity of 40Ts is enough to do trouble shooting of extending coverage. For UE Rx–Tx time difference is larger than 1000Ts and less than 2000Ts. the granularity is 200Ts. And for UE Rx–Tx time difference is larger than 2000Ts and less than 4096Ts, the granularity is 1048Ts.