Methods and apparatuses for performing random access in a telecommunications system

摘要

A method of enabling a user equipment to perform a contention based random access, includes maintaining a set of non-dedicated random access preambles for contention-free random access and a set dedicated random access preambles for contention-based random access. The method also includes determining a random access preamble identifier and transmitting a message to the user equipment containing the determined random access preamble identifier. Additionally, the method includes receiving from the user equipment a non-dedicated random access preamble that is selected by the user equipment based on the random access preamble identifier comprised in the transmitted message.

主权项

1. A method of enabling a user equipment to perform random access in a telecommunications system comprising a radio base station to which are assigned a first set of non-dedicated random access preambles and a second set of dedicated random access preambles, the method comprising:
receiving, from a radio base station, a message containing a random access preamble identifier; determining whether the random access preamble identifier received in the message comprises a predetermined identifier associated with non-dedicated random access preambles; if the random access preamble identifier received in the message comprises the predetermined identifier associated with non-dedicated random access preambles, randomly selecting a non-dedicated random access preamble and performing a contention-based random access procedure using the randomly-selected non-dedicated random access preamble; and if the random access preamble identifier received in the message does not comprise the predetermined identifier associated with non-dedicated random access preambles, performing a contention-free random access procedure using a dedicated preamble identified by the random access preamble identifier received in the message.