Wireless communication method and apparatus for selecting and reselecting cells based on measurements performed using directional beams and an omni-directional beam pattern
First Claim
1. In a wireless communication system including at least one wireless transmit/receive unit (WTRU) and a plurality of cells, the WTRU being configured to include a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern, a cell selection method comprising:
- (a) the WTRU performing measurements on signals received from the cells using the directional beams and the omni-directional beam pattern;
(b) the WTRU selecting a cell/beam combination having the strongest signal based on the results of the measurements performed in step (a); and
(c) the WTRU registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell.
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Accused Products
Abstract
A wireless communication method and apparatus for selecting and reselecting cells used by a wireless transmit/receive unit (WTRU) in a wireless multi-cell communication system. The WTRU includes a switched beam antenna configured to form a plurality of directional beams and an omni-directional beam pattern. The WTRU measures signals from a plurality of cells using the directional beams and the omni-directional beam pattern. The WTRU selects and registers with the cell having the strongest signal. In one embodiment, the WTRU selects a directional beam which has the strongest signal and uses it as an active beam to communicate with the selected cell. In another embodiment, the WTRU selects a cell/beam combination and registers with the selected cell using the selected beam. In yet another embodiment, the WTRU initiates a handoff to a neighboring cell that has a better signal measurement result than the selected cell.
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Citations
14 Claims
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1. In a wireless communication system including at least one wireless transmit/receive unit (WTRU) and a plurality of cells, the WTRU being configured to include a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern, a cell selection method comprising:
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(a) the WTRU performing measurements on signals received from the cells using the directional beams and the omni-directional beam pattern; (b) the WTRU selecting a cell/beam combination having the strongest signal based on the results of the measurements performed in step (a); and (c) the WTRU registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell. - View Dependent Claims (2, 3)
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4. In a wireless communication system including at least one wireless transmit/receive unit (WTRU) and a plurality of cells, the WTRU being configured to include a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern, a cell selection method comprising:
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(a) the WTRU performing measurements on signals received from the cells using the omni-directional beam pattern; (b) the WTRU selecting a subset of the cells based on the results of the measurements performed in step (a); (c) the WTRU performing measurements on signals received from the subset of cells using each of the directional beams; (d) the WTRU selecting a cell/beam combination having the strongest signal based on the results of the measurements performed in step (c); and (e) the WTRU registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell.
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5. In a wireless communication system including a plurality of cells, a wireless transmit/receive unit (WTRU) comprising:
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(a) a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern; (b) means for performing measurements on signals received from the cells using the directional beams and the omni-directional beam pattern; (c) means for selecting a cell/beam combination having the strongest signal based on the results of the measurements performed using either the directional beams or the omni-directional beam pattern; and (d) means for registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell. - View Dependent Claims (6, 7)
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8. In a wireless communication system including a plurality of cells, a wireless transmit/receive unit (WTRU) comprising:
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(a) a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern; (b) means for performing measurements on signals received from the cells using the omni-directional beam pattern; (c) means for selecting a subset of the cells based on the results of the measurements using the omni-directional beam pattern; (d) means for performing measurements on signals received from the subset of cells using each of the directional beams; (e) means for selecting a cell/beam combination having the strongest signal based on the results of the measurements performed using each of the directional beams; and (f) means for registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell.
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9. In a wireless communication system including a plurality of cells, an integrated circuit (IC) operating in conjunction with a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern, the IC comprising:
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(a) means for performing measurements on signals received from the cells using the directional beams and the omni-directional beam pattern; (b) means for selecting a cell/beam combination having the strongest signal based on the results of the measurements performed using either the directional beams or the omni-directional beam pattern; and (c) means for registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell. - View Dependent Claims (10, 11)
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12. In a wireless communication system including a plurality of cells, an integrated circuit (IC) operating in conjunction with a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern, the IC comprising:
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(a) means for performing measurements on signals received from the cells using the omni-directional beam pattern; (b) means for selecting a subset of the cells based on the results of the measurements using the omni-directional beam pattern; (c) means for performing measurements on signals received from the subset of cells using each of the directional beams; (d) means for selecting a cell/beam combination having the strongest signal based on the results of the measurements performed using each of the directional beams; and (e) means for registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell.
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13. In a wireless communication system including at least one wireless transmit/receive unit (WTRU) and a plurality of cells, the WTRU being configured to include a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern, a cell selection method comprising:
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(a) the WTRU performing measurements on signals received from the cells using the directional beams; (b) the WTRU selecting a cell/beam combination having the strongest signal based on the results of the measurements performed in step (a); and (c) the WTRU registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell.
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14. In a wireless communication system including a plurality of cells, a wireless transmit/receive unit (WTRU) comprising:
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(a) a switched beam antenna for generating a plurality of directional beams and an omni-directional beam pattern; (b) means for performing measurements on signals received from the cells using the directional beams; (c) means for selecting a cell/beam combination having the strongest signal based on the results of the measurements performed using either directional beams; and (d) means for registering with the selected cell using the selected beam as an active beam used for communicating with the selected cell.
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Specification