Method of performing uplink synchronization in wireless communication system

Patent metadata

Field	Value
Publication number	US-9538490-B2
Application number	US-201514688808-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	Jun 18, 2007
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A method of performing uplink synchronization in a wireless communication system includes transmitting a random access preamble which is randomly selected from a set of random access preambles, receiving a random access response, the random access response comprising a random access preamble identifier corresponding to the random access preamble and a time alignment value for uplink synchronization, starting a time alignment timer after applying the time alignment value, starting a contention resolution timer after receiving the random access response, wherein contention resolution is not successful when the contention resolution timer is expired, and stopping the time alignment timer when the contention resolution timer is expired.

First claim

What is claimed:

1. A method of performing uplink synchronization in a wireless communication system, the method comprising:
transmitting, by a user equipment (UE), a first random access preamble to a network;
receiving, by the UE, a random access response comprising a timing alignment command from the network, wherein the random access response is identified by an identifier associated with a radio network temporary identity;
starting, by the UE, a time alignment timer after…

Assignees

• Lg Electronics Inc

Inventors

• Park Sung Jun
• Lee Young Dae
• Yi Seung June
• Chun Sung Duck

Classifications

• H04W74/0833

  Electricity · mapped topic

• H04W56/0015 Primary

  Electricity · mapped topic

• H04W56/0045

  Electricity · mapped topic

• H04W56/0005 Primary

  Electricity · mapped topic

• H04W74/008

  Electricity · mapped topic