Patent ID: 9432937
Filing Date: 2016-08-30
CPC Classification: H04W,Y02D

Claim Text:
1. A method of performing a random access procedure between a mobile terminal and a network, the method performed by the mobile terminal and comprising: transmitting, a first type of random access preamble or a second type of random access preamble, to the network; receiving a random access response sent from the network in response to the first type of random access preamble or the second type of random access preamble; wherein the first type of random access preamble is based on preamble selection by the mobile terminal, and the second type of random access preamble is not based on preamble selection by the mobile terminal; wherein the transmitting step and the receiving step being carried out for the first type of Random Access Preamble denote a contention-based random access procedure, and wherein the first type of Random Access Preamble is a contention-based preamble; the method further comprising: starting a contention resolution timer; monitoring a downlink control channel while the contention resolution timer operates; applying a back-off time if the identifier that indicates allocation of radio resources for a new transmission is not received upon expiration of the contention resolution timer; and performing random access procedures again after the back-off time, wherein the downlink control channel is not monitored during the back-off time.