Methods radio network nodes and user equipment for alleviating interference in a radio communication network
First Claim
1. A method, performed by a first radio network node in a radio communication network where subframes are transmitted in pre-determined positions within radio frames, wherein the first radio network node employs a subframe scheme where at least one of the pre-determined positions is allocated to a flexible subframe in which the direction of signal transmission is variable between uplink and downlink from one radio frame to another, for triggering mitigation of interference on downlink radio signals received by a victim User Equipment, UE, in a victim cell, said interference being caused by transmission of uplink radio signals from an aggressor UE in an aggressor cell during the flexible subframe, the method comprising:
- detecting that a first UE, being one of the victim and aggressor UEs, is served by the first radio network node within a first cell, wherein the first UE is located in a border region of the first cell of the first radio network node,identifying a second radio network node which employs a subframe scheme such that an uplink transmission from the aggressor UE potentially overlaps at least partly with downlink reception at the victim UE during the flexible subframe, andsending a notification to the identified second radio network node, the notification indicating the flexible subframe and the first UE being served by the first radio network node, to trigger the second radio network node to execute an interference mitigation action for alleviating said interference when a second UE, being the other one of the victim and aggressor UEs, is served by the second radio network node within a second cell during the flexible subframe, wherein the second UE is located in a border region of the second cell is adjacent to the border region of the first cell, and the first cell and the second cell are neighbor cells.
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Accused Products
Abstract
Methods and radio network nodes (BS1, BS2) for alleviating interference on downlink radio signals in a victim User Equipment, UE (T1, T2), caused by uplink transmission from an aggressor UE (T2, T1). The interference occurs during a flexible subframe in which the direction of signal transmission is variable between uplink and downlink in different radio frames. A first radio network node (BS1) detects (4:1) that a first UE (T1) that is served by the first radio network node (BS1) is one of the victim and aggressor UEs. The first radio network node (BS1) identifies (4:2) a second radio network node (BS2) employing a subframe scheme such that uplink transmission from the aggressor UE may overlap at least partly with downlink reception in the victim UE during the flexible subframe. The first radio network node (BS1) sends (4:3) a notification to the second radio network node, indicating that the first UE is served by the first radio network node. The second radio network node (BS2) is thereby triggered to execute (4:5) an interference mitigation action for alleviating the interference when serving a second UE (T2) being the other one of the victim and aggressor UEs.
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Citations
18 Claims
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1. A method, performed by a first radio network node in a radio communication network where subframes are transmitted in pre-determined positions within radio frames, wherein the first radio network node employs a subframe scheme where at least one of the pre-determined positions is allocated to a flexible subframe in which the direction of signal transmission is variable between uplink and downlink from one radio frame to another, for triggering mitigation of interference on downlink radio signals received by a victim User Equipment, UE, in a victim cell, said interference being caused by transmission of uplink radio signals from an aggressor UE in an aggressor cell during the flexible subframe, the method comprising:
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detecting that a first UE, being one of the victim and aggressor UEs, is served by the first radio network node within a first cell, wherein the first UE is located in a border region of the first cell of the first radio network node, identifying a second radio network node which employs a subframe scheme such that an uplink transmission from the aggressor UE potentially overlaps at least partly with downlink reception at the victim UE during the flexible subframe, and sending a notification to the identified second radio network node, the notification indicating the flexible subframe and the first UE being served by the first radio network node, to trigger the second radio network node to execute an interference mitigation action for alleviating said interference when a second UE, being the other one of the victim and aggressor UEs, is served by the second radio network node within a second cell during the flexible subframe, wherein the second UE is located in a border region of the second cell is adjacent to the border region of the first cell, and the first cell and the second cell are neighbor cells. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A first radio network node in a radio communication network where subframes are transmitted in pre-determined positions within radio frames, the first radio network node being configured to employ a subframe scheme where at least one of the pre-determined positions is allocated to a flexible subframe in which the direction of signal transmission is variable between uplink and downlink from one radio frame to another, and to trigger mitigation of interference on downlink radio signals received by a victim User Equipment, UE, in a victim cell, said interference being caused by transmission of uplink radio signals from an aggressor UE in an aggressor cell during the flexible subframe, the first radio network node comprising a memory for storing instructions, the instructions, when executed by a processor, operable to:
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detect that a first UE, being one of the victim and aggressor UEs, is served by the first radio network node within a first cell, wherein the first UE is located in a border region of the first cell of the first radio network node, identify a second radio network node which employs a subframe scheme such that an uplink transmission from the aggressor UE potentially overlaps at least partly with downlink reception at the victim UE during the flexible subframe, and send a notification to the identified second radio network node, the notification indicating the flexible subframe and the first UE being served by the first radio network node, to trigger the second radio network node to execute an interference mitigation action for alleviating said interference when a second UE, being the other one of the victim and aggressor UEs, is served by the second radio network node within a second cell during the flexible subframe, wherein the second UE is located in a border region of the second cell of the second radio network node, wherein the border region of the second cell is adjacent to the border region of the first cell, and the first cell and the second cell are neighbor cells. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A second radio network node in a radio communication network where subframes are transmitted in pre-determined positions within radio frames, wherein a first radio network node in the radio communication network employs a subframe scheme where at least one of the pre-determined positions is allocated to a flexible subframe in which the direction of signal transmission is variable between uplink and downlink from one radio frame to another, the second radio network node being configured to alleviate interference on downlink radio signals received by a victim User Equipment, UE, in a victim cell, said interference being caused by transmission of uplink radio signals from an aggressor UE in an aggressor cell during the flexible subframe, the second radio network node comprising a memory for storing instructions, the instructions, when executed by a processor, operable to:
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receive a notification from the first radio network node, the notification indicating that an uplink transmission from the aggressor UE potentially overlaps at least partly with downlink reception in the victim UE during the flexible subframe, and that a first UE, being one of the victim and aggressor UEs, is served by the first radio network within a first cell, wherein the first UE is located in a border region of the first cell of the first radio network node, detect that a second UE, being the other one of the victim and aggressor UEs, is served by the second radio network node within a second cell, wherein the second UE is located in a border region of the second cell of the second radio network node, wherein the border region of the second cell is adjacent to the border region of the first cell, and the first cell and the second cell are neighbor cells, select an interference mitigation action for the detected second UE based on the received notification, and execute the selected interference mitigation action. - View Dependent Claims (15, 16)
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17. A User Equipment, UE, configured to be served by a serving radio network node in a radio communication network where subframes are transmitted in pre-determined positions within radio frames, wherein at least one of the serving radio network node and a neighbouring radio network node in the radio communication network employs a subframe scheme where at least one of the pre-determined positions is allocated to a flexible subframe in which the direction of signal transmission is variable between uplink and downlink from one radio frame to another, and configured to alleviate interference on downlink radio signals received by a victim UE in a victim cell, said interference being caused by transmission of uplink radio signals from an aggressor UE in an aggressor cell during the flexible subframe, the UE comprising a memory for storing instructions, the instructions, when executed by a processor, operable to:
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receive a notification from the serving radio network node, which notification indicates that the UE is one of the victim and aggressor UEs, when the victim UE is located in a border region of the victim cell and the aggressor UE is located in a border region of the aggressor cell, and the border region of the aggressor cell is adjacent to the border region of the victim cell and the victim cell and the aggressor cell are neighbor cells, and execute an interference mitigation action based on the received notification. - View Dependent Claims (18)
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Specification