United States Patent 9,930,696
Ozluturk March 27, 2018
Random access channel for OFDM-MIMO system
Abstract
In orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) systems, a wireless transmit/receive unit (WTRU) selects a random access channel (RACH) and a phase for a constant amplitude zero auto correlation (CAZAC) sequence for RACH transmission. The WTRU then transmits a RACH transmission to a Node B via the selected RACH. Once the RACH transmission is detected, the Node B sends an acknowledgement (ACK) to the WTRU over an ACK channel. The Node B may transmit the ACK on a shared channel. The WTRU may ramp up transmit power while the RACH transmission is transmitted, or steps up transmit power of a subsequent RACH transmission. The RACH transmission and data transmission may be either time multiplexed or frequency multiplexed. A plurality of RACHs may be defined and one of the defined RACHs may be selected randomly or based on predetermined criteria.
Inventors:
Ozluturk; Fatih M. (Port Washington, NY)
Applicant:
Name
City
State
Country
Type
InterDigital Technology Corporation
Wilmington
DE
US
Assignee:
InterDigital Technology Corporation (Wilmington, DE)
Family ID:
1000003198587
Appl. No.:
14/827,917
Filed:
August 17, 2015
Prior Publication Data
Document Identifier
Publication Date
US 20150359006 A1 Dec 10, 2015
Related U.S. Patent Documents
Application Number
Filing Date
Patent Number
Issue Date
13845606 Mar 18, 2013 9113484
13224463 Mar 19, 2013 8400986
11746363 Sep 6, 2011 8014361
60798970 May 9, 2006
Current U.S. Class: 1/1
Current CPC Class: H04W 74/0833 (20130101); H04B 7/0413 (20130101); H04J 13/0059 (20130101); H04W 74/004 (20130101); H04W 74/0866 (20130101); H04L 27/2637 (20130101); H04L 27/2608 (20130101)
Current International Class: H04W 74/08 (20090101); H04W 74/00 (20090101); H04L 27/26 (20060101); H04B 7/0413 (20170101); H04J 13/00 (20110101)
Field of Search: ;370/329,343
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