Random Access with Primary and Secondary Component Carrier Communications
First Claim
1. A method in a user equipment, UE, communicating with a radio base station on a primary cell associated with a first frequency and at least one secondary cell associated with a second frequency different from the first frequency, the method comprising:
- transmitting a preamble on a random access channel, RACH, to the radio base station on the secondary cell;
receiving a random access response message from the radio base station on a different cell than the UE transmitted its preamble on, said random access response message including timing advance information for an uplink transmission by the UE and including a cell identifier to determine the secondary cell that the control information in the random access response message refers to; and
transmitting to the radio base station based on the timing advance information in the random access response message.
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Accused Products
Abstract
The invention relates to random access procedures in an LTE-system applying carrier aggregation, in particular to support network-initiated random access on secondary cells. A UE transmits a preamble on a random access channel to a radio base station on a secondary cell and receives or detects a random access response message from the base station including timing advance information for uplink transmission by the UE. The UE can determine the secondary cell that the control information in the random access response message refers to and transmits to the base station based on the timing advance information in the random access response message.
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Citations
33 Claims
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1. A method in a user equipment, UE, communicating with a radio base station on a primary cell associated with a first frequency and at least one secondary cell associated with a second frequency different from the first frequency, the method comprising:
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transmitting a preamble on a random access channel, RACH, to the radio base station on the secondary cell; receiving a random access response message from the radio base station on a different cell than the UE transmitted its preamble on, said random access response message including timing advance information for an uplink transmission by the UE and including a cell identifier to determine the secondary cell that the control information in the random access response message refers to; and transmitting to the radio base station based on the timing advance information in the random access response message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method in a radio user equipment, UE, communicating with a radio base station on a primary cell associated with a first frequency and at least one secondary cell associated with a second frequency different from the first frequency, the method comprising:
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transmitting a preamble on a random access channel, RACH, to the radio base station on the secondary cell; performing blind decoding operations for the secondary cell on a downlink control channel search space for said secondary cell on which the preamble was sent; detecting a random access response message from the radio base station, said random access response message including timing advance information for an uplink transmission by the UE; transmitting to the radio base station on the secondary cell on which the preamble was sent based on the timing advance information in the random access response message. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method in radio base station operating a plurality of cells and communicating with user equipments, UEs, on primary cells associated with a first frequency and at least one secondary cell associated with a second frequency, the method comprising:
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configuring the UEs with specific sets of random access preambles such that UEs sharing a same primary cell and configured on a specific secondary cell are configured with the same set of random access preambles on this secondary cell; providing information on said specific sets of random access preambles to the UEs; detecting a preamble on RACH from a first one of the UEs on the secondary cell; transmitting a random access response from the radio base station on a different cell than the first UE transmitted its preamble on, said random access response including timing advance information for an uplink transmission by the first UE and including a cell identifier to determine the secondary cell that the control information in the random access response message refers to. - View Dependent Claims (29, 30)
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31. A user equipment, UE, comprising a radio circuitry for communicating with a radio base station on a primary cell associated with a first frequency and at least one secondary cell associated with a second frequency different from the first frequency, the UE adapted to
transmit a preamble on a random access channel, RACH, to the radio base station on the secondary cell; -
receive a random access response from the radio base station on a different cell than the UE transmitted its preamble on, said random access response including timing advance information for an uplink transmission by the UE and including a cell identifier to determine the secondary cell that the control information in the random access response message refers to; and transmit to the base station based on the timing advance information in the random access response message.
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32. A user equipment, UE, comprising a radio circuitry for communicating with a radio base station on a primary cell associated with a first frequency and at least one secondary cell associated with a second frequency different from the first frequency, the user equipment adapted to:
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transmit a preamble on a random access channel, RACH, to the radio base station on the secondary cell; perform blind decoding operations for the secondary cell on a downlink control channel search space for said secondary cell on which the preamble was sent; detect the random access response message from the base station, said random access response including timing advance information for an uplink transmission by the UE; and transmit to the base station on the secondary cell on which the preamble was sent based on the timing advance information in the random access response message.
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33. A radio base station comprising a radio circuitry for operating a plurality of cells and communicating with user equipments, UE, on primary cells associated with a first frequency and at least one secondary cell associated with a second frequency, the radio base station adapted to:
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configure the user equipments with specific sets of random access preambles such that user equipments sharing a same primary cell and configured on a specific secondary cell are configured with the same set of random access preambles on this secondary cell; provide information on said specific sets of random access preambles to the user equipments; detect a preamble on RACH from the user equipment on the secondary cell; and transmit a random access response from the radio base station on a different cell than the UE transmitted its preamble on, said random access response including timing advance information for an uplink transmission by the UE and including a cell identifier to determine the secondary cell that the control information in the random access response message refers to.
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Specification