LTE basic timing unit Ts introduction

In LTE, basic timing unit Ts is defined as 1/(15000 * 2048) seconds. The reason behind this definition is as follows:

1. Ts is sampling time for one OFDM symbol with 2048 points IFFT. So the OFDM symbol duration in time domain is exactly 2048 * Ts = (1/15000) seconds

2. Ts is exactly multiple of UMTS and 1xEV-DO chip rate. In UMTS, the chip rate is 3.84Mcps and in 1xEV-DO, chip rate is 1.2288Mcps. This would greatly reduce the complexity of chipset.