Method and apparatus for power control of first data transmission in random access procedure of FDMA communication system
US8494572B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2009 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Feb 24, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/50
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Transmit power is controlled for a first uplink data transmission on Physical Uplink Shared Channel (PUSCH) during random access channel (RACH) procedure. Power control adjustment for the first PUSCH transmission is performed relative to the power spectral density used for successful PRACH transmission as adjusted for bandwidth difference, etc. The uplink Physical random access channel carries the RACH information that is transmitted by the user equipment (UE) during registrations or base station originated calls. A PRACH is composed of a number of preambles and a message portion. The preambles are a series of radio frequency power “steps” that increase in power according to the power step setting until the maximum number of preambles is reached or the base station acknowledges. Once the UE receives a positive indication, it transmits the message portion of the PRACH which consists of message data and control data with independent power gain control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.