Methods and apparatuses for performing preamble assignment for random access in a telecommunications system
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsMichael MEYER, Magnus STATTIN
Life of this patent
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Abstract
The present invention relates to methods and apparatuses (radio base station (120, 600) and UE (110, 700) for enabling a UE to perform a random access. According to embodiments of the present invention, an identification number of a dedicated random access preamble is, in a message, transmitted together with information indicating in which channel or channels the preamble is valid for the UE. The UE (110, 700) can then use the received information and based on that information perform a random access.
Claims18
A method in a radio base station, of assigning a preamble to a user equipment, UE, for enabling said UE to perform a random access, said radio base station being allocated a first set forming a pool of non-dedicated random access preambles and a second set forming a pool of dedicated random access preambles, the method characterized in that it comprises the steps of:
- determining a dedicated random access preamble, of the second set, available for assignment to said UE;
- and
- transmitting a message to the UE, the message comprising an identification number of said available dedicated random access preamble and further comprising information indicating in which of at least one physical random access channel, PRACH, occurrence, the dedicated random access preamble is valid to be used by the UE for random access.
A method of enabling a user equipment, UE, to perform a random access in a telecommunications system comprising a radio base station being allocated a first set forming a pool of non-dedicated random access preambles and a second set forming a pool of dedicated random access preambles, the method characterized in that it comprises the steps of:
- receiving a message from said radio base station, the message comprising an identification number of an available dedicated random access preamble, of the second set;
- said message further comprising information indicating in which of at least one physical random access channel, PRACH, occurrence, the dedicated random access preamble is valid to be used by the UE for random access;
- and
- performing a random access based on the received identification number of the available random access preamble and based on the indicated information concerning said at least one PRACH occurrence.
A method in a telecommunications system, of assigning a preamble to a user equipment, UE, for enabling said UE to perform a random access, said system comprising a radio base station being allocated a first set forming a pool of non-dedicated random access preambles and a second set forming a pool of dedicated random access preambles, the method characterized in that it comprises the steps of:
- determining in the radio base station, a dedicated random access preamble, of the second set, available for assignment to the UE;
- receiving at the UE, a message from the radio base station, the message comprising an identification number of the available dedicated random access preamble and further comprising information indicating in which of at least one physical random access channel, PRACH, occurrence, the dedicated random access preamble is valid to be used by the UE for random access;
- and
- performing, by the UE, a random access based on the received identification number of the available random access preamble and based on the indicated information concerning said at least one PRACH occurrence.
18-34. (canceled)
Dependencies are inferred from the claim text.