METHOD FOR MAINTAINING UPLINK TIMING SYNCHRONIZATION IN A MOBILE COMMUNICATION SYSTEM AND USER EQUIPMENT APPARATUS FOR THE SAME
First Claim
Patent Images
1. A method for maintaining uplink timing synchronization (sync) in a mobile communication system, comprising:
- transmitting to a Node B an uplink sync request message including a preamble code;
receiving from the Node B an uplink sync response message in response to the request message;
adjusting uplink timing according to uplink timing adjustment information included in the response message, and storing the adjusted uplink timing as reference uplink timing for uplink signaling or data transmission;
periodically measuring downlink timing after storing the reference uplink timing, and calculating a difference between the measured downlink timing and previously stored reference downlink timing;
determining the uplink timing using the calculated difference of the downlink timing and the reference uplink timing;
receiving a request message for readjustment of the uplink timing from a Node B that has detected a discrepancy of the uplink timing;
readjusting the uplink timing using uplink timing adjustment information included in the uplink timing readjustment request message, updating the reference uplink timing with the readjusted uplink timing, and storing the updated reference uplink timing; and
updating a last measured downlink timing as the reference downlink timing when updating the reference uplink timing, and storing the reference downlink timing.
4 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a method for maintaining uplink timing synchronization by a User Equipment (UE) in a mobile communication system, without uplink transmission of a preamble from a UE or without transmission of uplink timing difference information from an Evolved Node B (E-NB) to solve the inefficient use problem of radio resources, occurring due to periodic transmission of uplink signaling and downlink signaling during maintenance of the uplink timing synchronization, and a UE apparatus for the same.
68 Citations
10 Claims
-
1. A method for maintaining uplink timing synchronization (sync) in a mobile communication system, comprising:
-
transmitting to a Node B an uplink sync request message including a preamble code;
receiving from the Node B an uplink sync response message in response to the request message;
adjusting uplink timing according to uplink timing adjustment information included in the response message, and storing the adjusted uplink timing as reference uplink timing for uplink signaling or data transmission;
periodically measuring downlink timing after storing the reference uplink timing, and calculating a difference between the measured downlink timing and previously stored reference downlink timing;
determining the uplink timing using the calculated difference of the downlink timing and the reference uplink timing;
receiving a request message for readjustment of the uplink timing from a Node B that has detected a discrepancy of the uplink timing;
readjusting the uplink timing using uplink timing adjustment information included in the uplink timing readjustment request message, updating the reference uplink timing with the readjusted uplink timing, and storing the updated reference uplink timing; and
updating a last measured downlink timing as the reference downlink timing when updating the reference uplink timing, and storing the reference downlink timing. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A user equipment apparatus for maintaining uplink timing synchronization (sync), comprising:
-
a message transceiver for receiving a message including uplink timing adjustment information from a Node B, and transmitting uplink data and signaling to the Node B according to uplink timing;
a message decrypter for decrypting a message received from the message transceiver to acquire the uplink timing adjustment information;
a reference timing manager for setting reference uplink timing according to the acquired uplink timing adjustment information, and setting the reference downlink timing according to the downlink timing;
an uplink timing adjuster for periodically adjusting the uplink timing using a difference between the downlink timing and the reference downlink timing, and the reference uplink timing;
a timer for counting a period for which the uplink timing is adjusted; and
a downlink measurer for measuring the downlink timing according to the period, and providing the measured downlink timing to the uplink timing adjuster and the reference timing manager. - View Dependent Claims (7, 8, 9, 10)
-
Specification