US Patent Application No: 2012/0140,664

Number of patents in Portfolio can not be more than 2000

RANDOM ACCESS FOR WIRELESS MULTIPLE-ACCESS COMMUNICATION SYSTEMS

ALSO PUBLISHED AS: 8711763

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Techniques for facilitating random access in wireless multiple-access communication systems are described. A random access channel (RACH) is defined to comprise a “fast” RACH (F-RACH) and a “slow” RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. Other aspects, embodiments, and features are also claimed and described.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
QUALCOMM INCORPORATEDSAN DIEGO, CA14651

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Howard, Steven J Ashland, US 121 3093
Ketchum, John W Harvard, US 139 3581
Wallace, Mark S Bedford, US 123 1685
Walton, J Rodney Carlisle, US 75 923

Cited Art Landscape

Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (1)
* 2005/0245,264 Methods and apparatus for operating mobile nodes in multiple states 14 2005
 
ERICSSON INC. (1)
* 5,491,837 Method and system for channel allocation using power control and mobile-assisted handover measurements 307 1994
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (11)
8,570,988 Channel calibration for a time division duplexed communication system 7 2005
8,934,329 Transmit diversity processing for a multi-antenna communication system 0 2005
8,913,529 MIMO WLAN system 0 2008
8,483,188 MIMO system with multiple spatial multiplexing modes 10 2008
8,355,313 MIMO system with multiple spatial multiplexing modes 7 2008
8,462,643 MIMO WLAN system 19 2008
8,855,226 Rate selection with margin sharing 2 2008
8,873,365 Transmit diversity processing for a multi-antenna communication system 1 2009
9,031,097 MIMO system with multiple spatial multiplexing modes 0 2009
8,750,151 Channel calibration for a time division duplexed communication system 2 2012
9,048,892 MIMO system with multiple spatial multiplexing modes 0 2013
 
MEDIATEK INC. (1)
* 8,548,082 Contention-based access channel design in MIMO OFDM/OFDMA systems 1 2009
 
LG ELECTRONICS INC. (1)
* 8,401,031 Method of performing random access procedure in wireless communication system 1 2008
* Cited By Examiner