Method and apparatus for selecting a beam combination in a MIMO wireless communication system
First Claim
1. A method for a first node to select a beam combination for communication between the first node and a second node, the method comprising:
- the first node sending a plurality of modulation and coding scheme (MCS) requests to the second node, each of the plurality of MCS requests being sent using a particular beam combination;
the first node receiving a second-node-generated MCS feedback signal for each of the MCS requests, each MCS feedback signal including an MCS recommendation for the particular beam combination; and
the first node selecting a beam combination configured to communicate with the second node based on the MCS recommendations;
the first node measuring a received signal strength indication (RSSI) on each of the MCS feedback signalswherein the first node selects the beam combination corresponding to an MCS recommendation providing a highest data rate;
and on a condition that there is more than one MCS recommendation providing the same highest data rate the first node selects the beam combination corresponding to a simplest MCS recommendation;
and on a condition that there is more than one MCS recommendation having the same simplest MCS recommendation the first node selects the beam combination corresponding to a highest RSSI;
and on a condition that there is more than one MCS recommendation corresponding to the same highest RSSI the first node selects a beam combination corresponding to a lowest beam number.
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Abstract
A method and apparatus for selecting a beam combination of beam switched antennas in a multiple-input multiple-output (MIMO) wireless communication system including a first node and a second node. The first node sends a plurality of modulation and coding scheme (MCS) requests to the second node. Each of the plurality of MCS requests is sent using a particular beam combination. The second node receives the MCS requests and generates MCS feedback signals for each of the MCS requests. Each MCS feedback signal includes an MCS recommendation for the particular beam. The first node selects a beam combination for communicating with the second node based on the MCS recommendations.
38 Citations
24 Claims
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1. A method for a first node to select a beam combination for communication between the first node and a second node, the method comprising:
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the first node sending a plurality of modulation and coding scheme (MCS) requests to the second node, each of the plurality of MCS requests being sent using a particular beam combination; the first node receiving a second-node-generated MCS feedback signal for each of the MCS requests, each MCS feedback signal including an MCS recommendation for the particular beam combination; and the first node selecting a beam combination configured to communicate with the second node based on the MCS recommendations; the first node measuring a received signal strength indication (RSSI) on each of the MCS feedback signals wherein the first node selects the beam combination corresponding to an MCS recommendation providing a highest data rate; and on a condition that there is more than one MCS recommendation providing the same highest data rate the first node selects the beam combination corresponding to a simplest MCS recommendation; and on a condition that there is more than one MCS recommendation having the same simplest MCS recommendation the first node selects the beam combination corresponding to a highest RSSI; and on a condition that there is more than one MCS recommendation corresponding to the same highest RSSI the first node selects a beam combination corresponding to a lowest beam number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless communication system comprising a first node and a second node, wherein the first node includes:
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a plurality of antennas, each antenna being configured to generate a plurality of beams such that a beam combination from the antennas is selected; a beam controller for activating a beam combination by selecting at least one beam from each of the antennas; a first beam combination selector configured to (i) send a plurality of modulation and coding scheme (MCS) requests to the second node using a particular beam combination, (ii) receive MCS feedback signals from the second node, each MCS feedback signal including an MCS recommendation for the particular beam combination, and (iii) select a beam combination for communication with the second node based on the MCS recommendation, and wherein the second node includes a second beam combination selector configured to receive the MCS requests and generate the MCS feedback signals for each of the MCS requests; wherein the first beam combination selector is configured to select a beam combination corresponding to an MCS recommendation providing a highest data rate; and on a condition that there is more than one MCS recommendation providing the same highest data rate the first beam combination selector is configured to select the beam combination corresponding to a simplest MCS recommendation; and on a condition that there is more than one MCS recommendation having the same simplest MCS recommendation the first beam combination selector is configured to select the beam combination corresponding to a highest RSSI; and on a condition that there is more than one MCS recommendation corresponding to the same highest RSSI the first beam combination selector is configured to select a beam combination corresponding to a lowest beam number. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A wireless communication system comprising a first node and a second node, wherein the first node includes:
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an antenna array comprising a plurality of omni-directional antennas; a phase shift matrix configured to shift a phase of each of the omni-directional antennas to form a plurality of antenna beams; a phase selection switch configured to select a beam combination including a subset of the antenna beams for communication with the second node; and a first beam combination selector configured to (i) send each of a plurality of modulation and coding scheme (MCS) requests to the second node using a selected beam combination, (ii) receive MCS feedback signals from the second node, each MCS feedback signal including an MCS recommendation for the particular beam combination, and (iii) select a beam combination for communication with the second node based on the MCS recommendation, and wherein the second node includes a second beam combination selector configured to receive the MCS requests and generate the MCS feedback signals for each of the MCS requests; wherein the first beam combination selector is configured to select a beam combination corresponding to an MCS recommendation providing a highest data rate; and on a condition that there is more than one MCS recommendation providing the same highest data rate the first beam combination selector is configured to select the beam combination corresponding to a simplest MCS recommendation; and on a condition that there is more than one MCS recommendation having the same simplest MCS recommendation the first beam combination selector is configured to select the beam combination corresponding to a highest RSSI; and on a condition that there is more than one MCS recommendation corresponding to the same highest RSSI the first beam combination selector is configured to select a beam combination corresponding to a lowest beam number. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification