Timing Alignment in an LTE System

摘要

A method for use in a user terminal in a cellular communications system. According to the method, the user terminal applies a first timing advance value to its transmissions to a controlling node, and the user terminal requests communication with the controlling node in a contention based procedure by transmitting an access request (MSG 1), in response to which the controlling node transmits an initiation message (MSG 2) along with a second timing advance value. According to the method, the user terminal uses the first timing advance value if the user terminal loses the contention based procedure, i.e. if the controlling node subsequently continues the initiated communication with said other user terminal.

主权项

1. A method for use in a user terminal in a cellular communications system, according to which method the user terminal applies a first timing advance value to its transmissions to a controlling node, and according to which method the user terminal requests communication with the controlling node in a contention based random access procedure by transmitting an access request to the controlling node, and in response to the access request, the user terminal receives from the controlling node, after receipt of the first timing advance value, an initiation message along with a second timing advance value, different from the first timing advance value, and wherein the method further includes the user terminal continuing to apply the first timing advance value after receipt of the second timing advance value if the first timing advance value is considered valid.