Reserving time alignment period for OFDMA communications with different numerology parameters
US10826736B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2016 |
| Grant date | Nov 3, 2020 |
| Priority date | — |
| Expiry date | May 13, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W72/0446
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Coexistence of OFDM transmissions with different sampling rates, subcarrier spacing, symbol duration, bandwidths, but a constant FFT size, all with the same integer ratio (downclocking or upclocking) N=2, 4, 8 . . . Now called different numerology. Problem of Time alignment due to the presence of alternating long CP and short CPs in a slot. At the slot level the transmissions are aligned, but not at the symbol level. The application proposes to send after the first symbol for N=1 a so-called Time Alignment Period of same duration for each transmission in order allegedly to allow the network nodes to synchronize their timings or clocks without interfering with the transmission or reception of any symbols or CPs of other transmissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.