NPRACH formats for NB-IoT transmission in TDD mode
US11357055B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2018 |
| Grant date | Jun 7, 2022 |
| Priority date | — |
| Expiry date | Nov 8, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W74/0866
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Random Access (RA) formats are defined for NB-IoT operation in TDD mode. The formats are defined to allow use of the legacy LTE subframe configurations for TDD. The formats specify a predetermined, even number P of symbol groups composing a RA preamble, wherein each symbol group comprises a Cyclic Prefix (CP) and a number X of symbols. The P symbol groups are divided into symbol group sets fitting into 1, or 2, or 3 contiguous uplink subframes, each comprising at least two symbol groups transmitted back-to-back (i.e., contiguously in time), and at least two symbol group sets are transmitted non-contiguously in time across a number of uplink subframes over which the RA preamble is transmitted. The number of symbol groups in a set can be two or three, and the number of symbol groups is four or six, respectively. Symbol groups within a set are transmitted on adjacent uplink subframes. Five format options are defined, which map to various of the LTE TDD configurations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.