Random access scheme for user equipment
First Claim
1. A random access method of a user equipment (UE), the method comprising:
- transmitting a random access preamble to a base station; and
receiving, from the base station after transmitting the random access preamble, a medium access control protocol data unit (MAC PDU) comprising a MAC header and a MAC payload, wherein the MAC payload includes N number of random access responses (MAC RARs) where ‘
N’
is zero or a positive integer,wherein, if N is zero, the random access method further comprises;
incrementing a random access preamble transmission counter by 1; and
indicating to a higher layer higher than a MAC layer that there is a random access problem, if the random access preamble transmission counter becomes a predetermined maximum number.
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Abstract
A method of efficiently processing a random access response message, when a terminal (or user equipment) performs random access, is disclosed. After the terminal transmits a random access preamble to a base station, the terminal may receive a random access response message having a format of medium access control protocol data unit (MAC PDU) including only a backoff indicator subheader in a MAC header of the MAC PDU, from the base station in response to the random access preamble. As described above, the terminal, which has received the random access response message including only a backoff indicator subheader in the MAC header of the MAC PDU, may consider a random access response reception procedure not successful and may perform a subsequent procedure for a random access responses reception failure.
54 Citations
12 Claims
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1. A random access method of a user equipment (UE), the method comprising:
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transmitting a random access preamble to a base station; and receiving, from the base station after transmitting the random access preamble, a medium access control protocol data unit (MAC PDU) comprising a MAC header and a MAC payload, wherein the MAC payload includes N number of random access responses (MAC RARs) where ‘
N’
is zero or a positive integer,wherein, if N is zero, the random access method further comprises; incrementing a random access preamble transmission counter by 1; and indicating to a higher layer higher than a MAC layer that there is a random access problem, if the random access preamble transmission counter becomes a predetermined maximum number. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A user equipment (UE) for a random access to a base station, the UE comprising:
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a transmitting (Tx) module for transmitting a random access preamble to the base station; a receiving (Rx) module for receiving, from the base station after transmitting the random access preamble, a medium access control protocol data unit (MAC PDU) comprising a MAC header and a MAC payload, wherein the MAC payload includes N number of random access responses (MAC RARs) where ‘
N’
is zero or a positive integer; anda processor adapted, for a case in which N is zero, to increment a random access preamble transmission counter by 1, and to indicate to a higher layer higher than a MAC layer that there is a random access problem, if the random access preamble transmission counter becomes a predetermined maximum number. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification