Random access procedure utilizing cyclic shift of demodulation reference signal
US8774113B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2009 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | May 31, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W74/0833
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for accessing a wireless communication system, and for processing random access attempts. A mobile communication device detects random-access information transmitted by a base station, transmits a random-access preamble to the base station according to the random-access information, and receives a random-access response from the base station. The random-access response includes at least an allocation of uplink resources to be used for the next step in the random access procedure. The mobile device also selects a reference signal sequence index from a pre-determined set of sequence indexes, and transmits a first message to the base station using the uplink resource allocation provided in the random-access response. The first message includes a device identifier and a first demodulation reference signal derived from a base reference sequence shifted according to the selected sequence index.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.