InterDigital Inc (IDCC)

[Gamco]

United States Patent 9,839,046
Pan , et al. December 5, 2017

Method and apparatus for accessing an uplink random access channel in a singular carrier frequency division multiple access system


Abstract

A method and apparatus for accessing a contention-based uplink random access channel (RACH) in a single carrier frequency division multiple access (SC-FDMA) system are disclosed. A wireless transmit/receive unit (WTRU) randomly selects a RACH subchannel and a signature among a plurality of available RACH subchannels and signatures. The WTRU transmits a preamble using the selected signature via the selected RACH subchannel at a predetermined or computed transmission power. A base station monitors the RACH to detect the preamble and sends an acquisition indicator (AI) to the WTRU when a signature is detected on the RACH. When receiving a positive acknowledgement, the WTRU sends a message part to the base station. If receiving a negative acknowledgement or no response, the WTRU retransmits the preamble.



Inventors:
Pan; Kyle Jung-Lin (Melville, NY), Tsai; Allan Y. (Melville, NY), Zhang; Guodong (Melville, NY)

Applicant:


Name

City

State

Country

Type


InterDigital Technology Corporation
Wilmington
DE
US


Assignee:
InterDigital Technology Corporation (Wilmington, DE)


Family ID:
1000002992806

Appl. No.:
15/044,261

Filed:
February 16, 2016


Prior Publication Data






Document Identifier

Publication Date

US 20160165623 A1 Jun 9, 2016



Related U.S. Patent Documents









Application Number

Filing Date

Patent Number

Issue Date

13963487 Aug 9, 2013 9301283
13192890 Oct 22, 2013 8565212
11507712 Aug 21, 2006
60710599 Aug 23, 2005




Current U.S. Class: 1/1
Current CPC Class: H04W 72/1226 (20130101); H04L 5/006 (20130101); H04L 5/0044 (20130101); H04W 52/08 (20130101); H04W 52/248 (20130101); H04W 52/48 (20130101); H04W 52/50 (20130101); H04W 72/0406 (20130101); H04W 72/0413 (20130101); H04W 74/0833 (20130101); H04L 1/188 (20130101); H04W 74/0866 (20130101); H04L 5/0007 (20130101); H04L 5/023 (20130101); H04L 27/2602 (20130101); H04W 8/26 (20130101); H04W 52/146 (20130101); H04W 52/16 (20130101); H04W 72/02 (20130101); H04W 72/042 (20130101); H04W 74/004 (20130101)
Current International Class: H04W 72/12 (20090101); H04L 1/18 (20060101); H04W 52/08 (20090101); H04W 52/48 (20090101); H04W 52/50 (20090101); H04W 74/08 (20090101); H04W 72/04 (20090101); H04W 52/24 (20090101); H04W 52/14 (20090101); H04W 74/00 (20090101); H04W 72/02 (20090101); H04L 27/26 (20060101); H04W 8/26 (20090101); H04W 52/16 (20090101); H04L 5/02 (20060101); H04L 5/00 (20060101)

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