InterDigital Inc (IDCC)

[Gamco]

United States Patent 9,980,295
Pelletier , et al. May 22, 2018

Random access procedures in wireless system


Abstract

A wireless transmit/receive unit (WTRU) may detect cell congestion by selecting a preamble type as a function of priority level, transmitting the preamble to a serving cell, receiving a random access response (RAR) from the serving cell, determining a congestion state of the serving cell as a function of the received RAR, and/or responding to the congestion state of the serving cell. RACH functionality may be improved by allocating one or more sets of Physical RACH (PRACH) resources to a WTRU. The WTRU may configure the additional PRACH resources based on the allocation. A WTRU may determine a second set of PRACH resources based at least in part on a first set of PRACH resources. A WTRU may determine additional sets of PRACH preambles and may utilize modified PRACH preambles and/or modified PRACH preamble formats. The WTRU may signal additional PRACH resources.



Inventors:
Pelletier; Ghyslain (Montreal, CA), Ahmad; Saad (Montreal, CA)

Applicant:


Name

City

State

Country

Type


INTERDIGITAL PATENT HOLDINGS, INC.
Wilmington
N/A
DE


Assignee:
InterDigital Patent Holdings, Inc. (Wilmington, DE)


Family ID:
1000003308343

Appl. No.:
15/410,979

Filed:
January 20, 2017


Prior Publication Data






Document Identifier

Publication Date

US 20170135135 A1 May 11, 2017



Related U.S. Patent Documents









Application Number

Filing Date

Patent Number

Issue Date

13838231 Mar 15, 2013 9603048
61611836 Mar 16, 2012
61644562 May 9, 2012
61678387 Aug 1, 2012




Current U.S. Class: 1/1
Current CPC Class: H04L 5/005 (20130101); H04W 74/0833 (20130101)
Current International Class: H04W 74/08 (20090101); H04L 5/00 (20060101)

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