Patent ID: 9370024
Filing Date: 2016-06-14
CPC Classification: H04W

Claim Text:
1. A method of performing a random access by a user equipment in a wireless communication system, comprising: receiving system information which is broadcasted by a base station, wherein the system information includes grouping information indicating a mapping between a plurality of random access preamble groups and a plurality of RNTIs (Radio Network Temporary Identifiers) to be used to receive a random access response; receiving, from the base station, a random access preamble index for an instant message, wherein the random access preamble index belongs to a random access preamble group which is mapped to a (Cell-Radio Network Temporary Identifier); transmitting, to the base station, a random access preamble corresponding to the random access preamble index; and receiving, from the base station, the random access response and the instant message by using the C-RNTI mapped to the random access preamble index, wherein the random access response comprises a TAC value in a form of a TAC MAC CE, and the TAC MAC CE is configured with 2 bytes and represents an absolute value of 11-bits.