Method for identifying pre-candidate cells for a mobile unit operating with a switched beam antenna in a wireless communication system, and corresponding system
First Claim
1. A method for operating a wireless transmit/receive unit (WTRU) in a wireless communication system comprising a plurality of cells, the WTRU comprising a switched beam antenna for generating antenna beams including a plurality of directional beams and an omni-directional beam, the method comprising:
- Using a selected antenna beam for exchanging data with a cell in an active set of cells;
receiving signals from cells not in the active set of cells using the selected antenna beam;
measuring the received signals from each cell not in the active set of cells for the selected antenna beam;
comparing the measured signals to an add pre-candidate set threshold, and adding the corresponding cells to a pre-candidate set of cells based upon the comparison;
ranking the cells in the pre-candidate set of cells based upon a level of their measured signals;
receiving signals from N of the top-ranked cells in the pre-candidate set of cells using the omni-directional beam and the selected antenna beam, with N being greater than or equal to 1;
measuring the received signals from each of the N cells for the omni-directional beam and the selected antenna beam;
comparing the measured signals to an add candidate set threshold, and moving the corresponding cells from the pre-candidate set of cells to the candidate set of cells based upon the comparison to the add candidate set threshold; and
sending a measurement report to the network.
1 Assignment
0 Petitions
Accused Products
Abstract
Measurements for identifying pre-candidate cells are made by a wireless transmit/receive unit (WTRU) operating with a switched beam antenna in a wireless communication system. The switched beam antenna is a smart antenna generating a plurality of directional beams and an omni-directional beam. The WTRU measures signals from cells not in an active set of cells to define a pre-candidate set of cells. Measured signals from cells in the pre-candidate set of cells are compared to a threshold, and the corresponding cells are moved from the pre-candidate set of cells to a candidate set of cells based upon the comparison to the threshold. A measurement report is then sent to the network.
-
Citations
27 Claims
-
1. A method for operating a wireless transmit/receive unit (WTRU) in a wireless communication system comprising a plurality of cells, the WTRU comprising a switched beam antenna for generating antenna beams including a plurality of directional beams and an omni-directional beam, the method comprising:
-
Using a selected antenna beam for exchanging data with a cell in an active set of cells; receiving signals from cells not in the active set of cells using the selected antenna beam; measuring the received signals from each cell not in the active set of cells for the selected antenna beam; comparing the measured signals to an add pre-candidate set threshold, and adding the corresponding cells to a pre-candidate set of cells based upon the comparison; ranking the cells in the pre-candidate set of cells based upon a level of their measured signals; receiving signals from N of the top-ranked cells in the pre-candidate set of cells using the omni-directional beam and the selected antenna beam, with N being greater than or equal to 1; measuring the received signals from each of the N cells for the omni-directional beam and the selected antenna beam; comparing the measured signals to an add candidate set threshold, and moving the corresponding cells from the pre-candidate set of cells to the candidate set of cells based upon the comparison to the add candidate set threshold; and sending a measurement report to the network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A wireless communication system comprising:
-
an active set of cells; a non-active set of cells; and a wireless transmit/receive unit (WTRU) comprising a switched beam antenna for generating antenna beams including a plurality of directional beams and an omni-directional beam, an antenna beam being selected for exchanging data with one or more cells in the active set of cells, a transceiver connected to said switched beam antenna for receiving signals from cells-not in the active set of cells using the selected antenna beam, a measuring unit connected to said transceiver for measuring the received signals from each cell not in the active set of cells for the selected antenna beam, and a controller for comparing the measured signals to an add pre-candidate set threshold, and adding the corresponding cells to a pre-candidate set of cells based upon the comparison, and ranking the cells in the pre-candidate set of cells based upon a level of their measured signals, said transceiver also receiving signals from N of the top-ranked cells in the pre-candidate set of cells using the omni-directional beam and the selected antenna beam, with N being greater than or equal to 1, said measuring unit also measuring the received signals from each of the N cells for the omni-directional beam and the selected antenna beam, and said controller also comparing the measured signals to an add candidate set threshold, and moving the corresponding cells from the pre-candidate set of cells to the candidate set of cells based upon the comparison to the add candidate set threshold, and sending a measurement report to the network. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification