Method and apparatus for cell selection in a wireless communication system
First Claim
1. A cell selection method of a terminal, the method comprising:
- identifying whether a first cell having greatest channel quality is a closed subscriber group (CSG) cell;
identifying, if the first cell is the CSG cell, whether an identification of the first cell is included in a cell list of the terminal;
selecting, if the identification of the first cell is not included in the cell list, a second cell having greatest channel quality after the first cell;
accessing the second cell; and
transmitting a radio resource control (RRC) message including an indicator indicating that a channel quality of the first cell is greater than a channel quality of the second cell, to the second cell,wherein the second cell is selected based on the channel quality of the second cell and an offset value obtained from first system information, andwherein the offset value is changed by the terminal if second system information is not received.
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Abstract
The present invention relates to a method for cell selection in a wireless communication system. The method for cell selection by a terminal according to one embodiment of the present invention may comprise the following steps: measuring the channel quality of a first cell; measuring the channel quality of a second cell; determining whether the value obtained by applying an offset to the result of the measurement of the channel quality of the second cell is better than the result of the measurement of the channel quality of the first cell; if the value obtained by applying an offset to the result of the measurement of the channel quality of the second cell is better than the result of the measurement of the channel quality of the first cell, determining whether the value obtained by applying no offset to the result of the measurement of the channel quality of the second cell is better than a preset reference value; and, if the value obtained by applying no offset to the result of the measurement of the channel quality of the second cell is better than the preset reference value, selecting the second cell. According to one embodiment of the present invention, an operable cell can be selected to prevent malfunctions, and interference from a CSG cell may be reduced.
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Citations
14 Claims
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1. A cell selection method of a terminal, the method comprising:
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identifying whether a first cell having greatest channel quality is a closed subscriber group (CSG) cell; identifying, if the first cell is the CSG cell, whether an identification of the first cell is included in a cell list of the terminal; selecting, if the identification of the first cell is not included in the cell list, a second cell having greatest channel quality after the first cell; accessing the second cell; and transmitting a radio resource control (RRC) message including an indicator indicating that a channel quality of the first cell is greater than a channel quality of the second cell, to the second cell, wherein the second cell is selected based on the channel quality of the second cell and an offset value obtained from first system information, and wherein the offset value is changed by the terminal if second system information is not received. - View Dependent Claims (2, 3, 4, 5)
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6. A scheduling method of a base station, the method comprising:
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receiving a radio resource control (RRC) message from a terminal; determining whether the RRC message includes an indicator indicating that a channel quality of a first cell is greater than a channel quality of a second cell; and scheduling, if the RRC message includes the indicator, resource for the terminal in consideration of a closed subscriber group (CSG) cell, wherein the first cell is the CSG cell having greatest channel quality and to which the terminal is not subscribed, wherein the second cell having greatest channel quality after the first cell is selected to be accessed by the terminal, wherein the second cell is selected by the terminal based on the channel quality of the second cell and an offset value included in first system information, and wherein the offset value is changed by the terminal if second system information is not received by the terminal. - View Dependent Claims (7)
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8. A terminal comprising:
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a transceiver configured to transmit and receive a signal; at least one processor configured to; identify whether a first cell having greatest channel quality is a closed subscriber group(CSG) cell, identify, if the first cell is the CSG cell, whether an identification of the first cell is included in a cell list of the terminal, select, if the identification of the first cell is not included in the cell list, a second cell having greatest channel quality after the first cell, access the second cell; and transmit a radio resource control (RRC) message including an indicator indicating that a channel quality of the first cell is greater than a channel quality of the second cell, to the second cell, wherein the second cell is selected based on the channel quality of the second cell and an offset value obtained from first system information, and wherein the offset value is changed by the terminal if second system information is not received. - View Dependent Claims (9, 10, 11, 12)
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13. A base station comprising:
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a transceiver configured to receive a radio resource control (RRC) message from a terminal; and at least one processor configured to; determine whether the RRC message includes an indicator indicating that a channel quality of a first cell is greater than a channel quality of a second cell, and schedule, if the RRC message includes the indicator, resource for the terminal in consideration of a closed subscriber group (CSG) cell, wherein the first cell is the CSG cell having greatest channel quality and to which the terminal is not subscribed, wherein the second cell having greatest channel quality after the first cell is selected to be accessed by the terminal, wherein the second cell is selected by the terminal based on the channel quality of the second cell and an offset value included in first system information, and wherein the offset value is changed by the terminal if second system information is not received by the terminal. - View Dependent Claims (14)
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Specification