US Patent No. 10,143,009

ENHANCED RANDOM ACCESS MECHANISM IN WIRELESS COMMUNICATION SYSTEM


Patent No. 10,143,009
Issue Date November 27, 2018
Title Enhanced Random Access Mechanism In Wireless Communication System
Inventorship Basu Mallick Prateek, Bangalore (IN)
Tushar Vrind, Bangalore (IN)
Vinay Kumar Shrivastava, Bangalore (IN)
Assignee Samsung Electronics Co., Ltd., Suwon-si (KR)

Claim of US Patent No. 10,143,009

1. A method for transmitting a power headroom report (PHR) by a terminal in a wireless communication network supporting carrier aggregation, the method comprising:receiving control information for activating a secondary cell with a first uplink carrier from a base station;
identifying the secondary cell to be activated based on the received control information;
transmitting a first PHR for at least one serving cell in response to the identified secondary cell being activated with the first uplink carrier;
deciding a carrier switching for a random access retrial in response to a failure of a random access procedure on the first uplink carrier, wherein the carrier switching for the random access retrial is decided when a downlink carrier linked with the first uplink carrier is deactivated when performing the random access procedure on the first uplink carrier;
performing the random access procedure on a second uplink carrier decided by the carrier switching, wherein the performing the random access procedure comprises transmitting a second PHR for at least one serving cell;
determining that only a prohibit PHR timer expires or has expired and a path loss has changed for a downlink carrier corresponding to the second uplink carrier since a last PHR transmission when the terminal has uplink resources for a new transmission; and
transmitting a third PHR for at least one serving cell in response to a determination that the prohibit PHR timer expires or has expired and the path loss has changed for the downlink carrier corresponding to the uplink carrier of the activated secondary cell since the last PHR transmission when the terminal has uplink resources for a new transmission.