Method of performing uplink synchronization in wireless communication system
First Claim
1. A method of performing uplink synchronization in a wireless communication system, the method performed by a user equipment (UE) and comprising:
- transmitting a random access preamble from the UE to a network;
receiving at the UE a random access response from the network, the random access response comprising a temporary UE identifier and a time alignment value for uplink synchronization with the network;
starting a first timer in the UE responsive to receiving of the time alignment value;
starting a second timer in the UE after receiving the random access response;
determining whether contention resolution is successful by the UE, wherein the contention resolution is not successful when the second timer expires; and
stopping the first timer in the UE if the contention resolution is not successful.
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Accused Products
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.
220 Citations
18 Claims
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1. A method of performing uplink synchronization in a wireless communication system, the method performed by a user equipment (UE) and comprising:
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transmitting a random access preamble from the UE to a network; receiving at the UE a random access response from the network, the random access response comprising a temporary UE identifier and a time alignment value for uplink synchronization with the network; starting a first timer in the UE responsive to receiving of the time alignment value; starting a second timer in the UE after receiving the random access response; determining whether contention resolution is successful by the UE, wherein the contention resolution is not successful when the second timer expires; and stopping the first timer in the UE if the contention resolution is not successful. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A user equipment (UE) for performing uplink synchronization in a wireless communication system, the UE comprising:
a radio frequency (RF) unit configured for; transmitting a random access preamble to a network; receiving a random access response from the network, the random access response comprising a temporary UE identifier and a time alignment value for uplink synchronization with the network; starting a first timer in the UE responsive to receiving of the time alignment value; starting a second timer in the UE after receiving the random access response; determining whether contention resolution is successful, wherein the contention resolution is not successful when the second timer expires; and stopping the first timer in the UE if the contention resolution is not successful. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
Specification