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

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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, CA10772

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Howard, Steven J Ashland, MA 197 3869
Ketchum, John W Harvard, MA 231 4734
Wallace, Mark S Bedford, MA 201 2725
Walton, J Rodney Carlisle, MA 120 1630

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (4)
8,570,988 Channel calibration for a time division duplexed communication system 0 2005
8,483,188 MIMO system with multiple spatial multiplexing modes 0 2008
8,355,313 MIMO system with multiple spatial multiplexing modes 0 2008
8,462,643 MIMO WLAN system 2 2008
 
LG ELECTRONICS INC. (1)
8,401,031 Method of performing random access procedure in wireless communication system 0 2008
 
MEDIATEK INC. (1)
8,548,082 Contention-based access channel design in MIMO OFDM/OFDMA systems 0 2009