Method and apparatus for transmitting or receiving RACH signal in beamforming system
First Claim
1. A method for operating a random access channel (RACH) by a base station (BS) in a communication system, the method comprising:
- dividing user equipments (UEs) located at a coverage of the BS into a first RACH group and a second RACH group based on a predetermined threshold compared to respective communication quality levels between the UEs of each RACH group and the BS;
broadcasting RACH configuration information including information of a first receive (Rx) beam sweep period and information of a second Rx beam sweep period;
performing first Rx beamforming for receiving a first RACH signal from at least one UE included in the first RACH group using a first Rx chain within the first Rx beam sweep period; and
performing second Rx beamforming for receiving a second RACH signal from at least one UE included in the second RACH group using a second Rx chain within the second Rx beam sweep period,wherein the first Rx beam sweep period is repeated a predetermined number of times within the second Rx beam sweep period, andwherein the first Rx beamforming is configured to be performed by the base station for a set of beam directions within the first Rx beam sweep period, and the second Rx beamforming is configured to be performed by the base station for the set of beam directions within the second Rx beam sweep period.
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Abstract
A method for operating a random access channel (RACH) by a base station (BS) performing beamforming with at least one receive chain includes broadcasting RACH configuration information; and receiving an RACH signal with at least one receive chain, wherein the RACH configuration information includes threshold information to divide an RACH groups into a first group and a second group. A BS for operating a RACH by performing beamforming with at least one receive chain in a communication system, the BS comprising a controller configured to broadcast RACH configuration information and control at least one receive chain to receive an RACH signal, wherein the RACH configuration information includes threshold information to divide RACH groups into a first group and a second group. Other embodiments including a user equipment are also disclosed.
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Citations
14 Claims
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1. A method for operating a random access channel (RACH) by a base station (BS) in a communication system, the method comprising:
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dividing user equipments (UEs) located at a coverage of the BS into a first RACH group and a second RACH group based on a predetermined threshold compared to respective communication quality levels between the UEs of each RACH group and the BS; broadcasting RACH configuration information including information of a first receive (Rx) beam sweep period and information of a second Rx beam sweep period; performing first Rx beamforming for receiving a first RACH signal from at least one UE included in the first RACH group using a first Rx chain within the first Rx beam sweep period; and performing second Rx beamforming for receiving a second RACH signal from at least one UE included in the second RACH group using a second Rx chain within the second Rx beam sweep period, wherein the first Rx beam sweep period is repeated a predetermined number of times within the second Rx beam sweep period, and wherein the first Rx beamforming is configured to be performed by the base station for a set of beam directions within the first Rx beam sweep period, and the second Rx beamforming is configured to be performed by the base station for the set of beam directions within the second Rx beam sweep period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station (BS) for operating a random access channel (RACH) in a communication system, the BS comprising:
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a first Rx chain; a second Rx chain; and a controller configured to divide user equipments (UEs) located at a coverage of the BS into a first RACH group and a second RACH group based on a predetermined threshold compared to respective communication quality levels between the UEs of each RACH group and the BS, and control a transceiver to broadcast RACH configuration information including information of a first receive (Rx) beam sweep period and information of a second Rx beam sweep period; control the first Rx chain to perform first Rx beamforming for receiving a first RACH signal from at least one UE included in the first RACH group within the first Rx beam sweep period; and control the second Rx chain to perform second Rx beamforming for receiving a second RACH signal from at least one UE included in the second RACH group within the second Rx beam sweep period, wherein the first Rx beam sweep period is repeated a predetermined number of times within the second Rx beam sweep period, and wherein the first Rx beamforming is configured to be performed by the base station for a set of beam directions within the first Rx beam sweep period, and the second Rx beamforming is configured to be performed by the base station for the set of beam directions within the second Rx beam sweep period. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification