Methods and apparatus to support interference management in multi-tier wireless communication systems
First Claim
1. A Closed Subscriber Group (CSG) base station (BS) capable of performing interference mitigation (IM) in a wireless communications network, the CSG BS comprising:
- a wireless communication unit configured to communicate with subscriber stations (SSs); and
a controller configured to;
directly receive a ranging purpose indication in a ranging request message from a non-member SS through the wireless communication unit, andin response to the ranging request message, selectively perform the IM from among predetermined IM methods comprising (i) reducing transmission power locally and (ii) changing from a CSG-Closed status to a CSG-Open status if the CSG BS is in the CSG-Closed status.
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Accused Products
Abstract
When a subscriber station (SS) encounters interference caused an interfering base station (BS), the interference can be mitigated regardless of whether the interfering base station is a CSG-Closed BS or whether the SS is connected to a serving BS. If the SS is not connected to a serving BS and cannot access the interfering BS, the SS will signal the interfering BS directly to request the interfering BS to perform IM. If the SS is a legal user, and conditions to initiate IM are met, the interfering BS will perform IM until conditions to terminate IM are met. If the SS is connected to a serving BS, the serving BS will request the interfering BS to perform or terminate interference mitigation (IM) on behalf of the SS if certain conditions are satisfied.
27 Citations
34 Claims
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1. A Closed Subscriber Group (CSG) base station (BS) capable of performing interference mitigation (IM) in a wireless communications network, the CSG BS comprising:
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a wireless communication unit configured to communicate with subscriber stations (SSs); and a controller configured to; directly receive a ranging purpose indication in a ranging request message from a non-member SS through the wireless communication unit, and in response to the ranging request message, selectively perform the IM from among predetermined IM methods comprising (i) reducing transmission power locally and (ii) changing from a CSG-Closed status to a CSG-Open status if the CSG BS is in the CSG-Closed status. - View Dependent Claims (2, 3, 4, 34)
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5. A Closed Subscriber Group (CSG) base station (BS) capable of performing interference mitigation (IM) in a wireless communications network, the CSG BS comprising:
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a wireless communication unit configured to communicate with subscriber stations (SSs); and a controller configured to; directly receive a ranging purpose indication in a ranging request message from a non-member SS through the wireless communication unit, and in response to the ranging request message, change the CSG BS from a CSG-Closed status to a CSG-Open status if the CSG BS is in the CSG-Closed status, wherein the ranging purpose indication indicates that the non-member SS is experiencing femto interference, and wherein the CSG-Closed status of the CSG BS does not allow the non-member SS to access the CSG BS.
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6. For use in a wireless communications network, a Closed Subscriber Group (CSG) base station (BS) capable of performing interference mitigation (IM), the CSG BS comprising:
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a wireless communication unit configured to communicate with subscriber stations (SSs); and a controller configured to; receive a ranging request message from a non-member SS through the wireless communication unit, the ranging request message comprising a ranging purpose indication, and in response to the ranging request message, perform an IM if conditions to initiate the IM are met, wherein the controller is further configured to receive at least one scanning report from the non-member SS to determine whether the conditions to initiate the IM are satisfied. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. For use in a wireless communications network, a method in a Closed Subscriber Group (CSG) base station (BS) for performing interference mitigation (IM), the method comprising:
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receiving a ranging request message from a non-member subscriber station (SS) through a wireless communication unit, the ranging request message comprising a ranging purpose indication; in response to the ranging request message, performing an IM if conditions to initiate the IM are met, and receiving at least one scanning report from the non-member SS to determine whether the conditions to initiate the IM are satisfied. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. For use in a wireless communications network, a serving base station (BS) capable of supporting interference mitigation (IM) when a subscriber station (SS) encounters interference, the serving BS comprising:
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a wireless communication unit configured to communicate with the SS; and a controller configured to; request an interfering BS to perform IM when, based on a scanning report for IM initiation, the SS is unable to handover to any neighboring BS and conditions for the IM initiation are met, and request the interfering BS to terminate the IM when, based on a scanning report for IM termination, conditions for the IM termination are met. - View Dependent Claims (25)
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26. A method in a serving base station (BS) for supporting interference mitigation (IM) when a subscriber station (SS) being served by the BS encounters interference, the method comprising:
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requesting an interfering BS to perform IM when, based on a scanning report for IM initiation, the SS is unable to handover to any neighboring BS and conditions for the IM initiation are met; and requesting the interfering BS to terminate the IM when, based on a scanning report for IM termination, conditions for the IM termination are met. - View Dependent Claims (27)
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28. For use in a wireless communications network, a subscriber station capable of supporting interference mitigation (IM) when encountering interference, the subscriber station comprising:
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a receiver configured to receive messages from base stations; a transmitter configured to transmit messages to the base stations; and a controller configured to; if the subscriber station is connected to a serving BS, send a first scanning report to the serving BS to initiate IM with an interfering BS when handover to another BS is not possible and trigger conditions to send the first scanning report for IM initiation are met, and if the subscriber station is not connected to any BS, send a ranging request message comprising a ranging purpose indication to the interfering BS to initiate the IM when handover to the interfering BS is not possible and trigger conditions to signal the interfering BS for the IM initiation are met. - View Dependent Claims (29, 30)
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31. A method in a subscriber station for supporting interference mitigation (IM) when encountering interference in a wireless communication network, the method comprising:
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if the subscriber station is connected to a serving BS, sending a first scanning report to the serving BS to initiate IM with an interfering BS when handover to another BS is not possible and trigger conditions to send the first scanning report for IM initiation are met; and if the subscriber station is not connected to any BS, sending a ranging request message comprising a ranging purpose indication to the interfering BS to initiate the IM when handover to the interfering BS is not possible and trigger conditions to signal the interfering BS for the IM initiation are met. - View Dependent Claims (32, 33)
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Specification