Cross link interference handling
There is provided mechanisms for cross link interference handling. A method is performed by a network node. The network node is configured to control a radio access network node. The method comprises obtaining, through measurements, information identifying cross link interference pertaining to wireless transmission from at least one neighbouring radio access network node. The method comprises controlling the radio access network node by performing a radio resource management action based on TDD configuration information derivable from the obtained information of cross link information of cross link interference. There is provided mechanisms for cross link interference reporting.
1 . A method for cross-link interference handling, the method being performed by a network node, the network node being configured to control a radio access network node, the method comprising:
obtaining, through measurements, information identifying cross-link interference pertaining to wireless transmission from at least one neighboring radio access network node; and
controlling the radio access network node by performing a radio resource management action based on time division duplex (TDD) configuration information derivable from the obtained information of cross-link interference, wherein obtaining information of cross-link interference comprises:
measuring on a synchronization signal block transmitted by the at least one neighboring radio access network node; and
acquiring the TDD configuration information from the at least one neighboring radio access network node by decoding at least one system information block in time/frequency resources transmitted by the at least one neighboring radio access network node, the time/frequency resources being defined by the synchronization signal block, wherein the TDD configuration information only is acquired when signal strength of the synchronization signal block is measured to be above a threshold value.
2 . The method of claim 1 , wherein the synchronization signal block is measured on frequencies given by a list of frequency bands.
3 . The method of claim 1 , wherein the threshold value is given with respect to at least one of: RSSI, RSRP, SINR, and RSRQ.
4 . The method of claim 1 , wherein the threshold value is based on a spectrum mask or an adjacent channel suppression capability of the network node.
5 . The method of claim 1 , wherein performing the radio resource management action comprises at least one of:
reconfiguring TDD configuration in terms of TDD UL/DL allocation of time/frequency resources for the radio access network node such that the time/frequency resources do not conflict with the cross-link interference;
determining which time/frequency resources and/or geographical areas are impacted by the cross-link interference;
identifying which at least one neighboring radio access network node is causing the cross-link interference; and
reporting the cross-link interference to a central network node.
6 . The method of claim 1 , wherein the at least one neighboring radio access network node is configured for beamformed transmission, and wherein the information of cross-link interference is obtained per beam or beam-direction of the beamformed transmission.
7 . The method of claim 1 , wherein, when pieces of information of cross-link interference pertaining to wireless transmission from at least two neighboring radio access network nodes are obtained, the pieces of information are combined when controlling the radio access network node.
8 . The method of claim 1 , wherein the TDD configuration information is defined by parameter tdd-UL-DL-ConfigurationCommon.
9 . A method for cross-link interference reporting, the method being performed by a terminal device, the terminal device being served by a radio access network node controlled by a network node, the method comprising:
measuring on a synchronization signal block transmitted by at least one neighboring radio access network node, thereby obtaining information identifying cross-link interference pertaining to wireless transmission from the at least one neighboring radio access network node, wherein the measuring is performed in accordance with a configuration provided by the network node, the configuration indicating that the measurements are for interference purposes by setting a threshold value for the measurements such that the terminal device is configured to only report measurements above the threshold value;
reporting, to the network node and in accordance with the configuration, the information of cross-link interference; and
acquiring time division duplex (TDD) configuration information from the at least one neighboring radio access network node by decoding at least one system information block in time/frequency resources transmitted by the at least one neighboring radio access network node, the time/frequency resources being defined by the synchronization signal block, and wherein the information of cross-link interference is defined by the TDD configuration information.
10 . The method of claim 9 , wherein the threshold value is given with respect to at least one of: RSSI, RSRP, SINR, and RSRQ.
11 . The method of claim 9 , wherein the threshold is based on a spectrum mask or an adjacent channel suppression capability of the network node.
12 . The method of claim 9 , wherein the TDD configuration information only is acquired when signal strength of the synchronization signal block is measured to be above the threshold value.
13 . The method of claim 9 , wherein the information of cross-link interference is defined by measurements obtained from measuring on the synchronization signal block.
14 . The method of claim 9 , wherein the information of cross-link interference is defined by cell identity of the at least one neighboring radio access network node, the cell identity being obtained from measuring on the synchronization signal block.
15 . A network node for cross-link interference handling, the network node being configured to control a radio access network node, the network node comprising processing circuitry, the processing circuitry being configured to cause the network node to:
obtain, through measurements, information identifying cross-link interference pertaining to wireless transmission from at least one neighboring radio access network node; and
control the radio access network node by performing a radio resource management action based on time division duplex (TDD) configuration information derivable from the obtained information of cross-link interference, wherein obtaining information of cross-link interference comprises:
measuring on a synchronization signal block transmitted by the at least one neighboring radio access network node; and
acquiring the TDD configuration information from the at least one neighboring radio access network node by decoding at least one system information block in time/frequency resources transmitted by the at least one neighboring radio access network node, the time/frequency resources being defined by the synchronization signal block, wherein the TDD configuration information only is acquired when signal strength of the synchronization signal block is measured to be above a threshold value.
16 . A terminal device for cross-link interference reporting, the terminal device being configured to be served by a radio access network node controlled by a network node, the terminal device comprising processing circuitry, the processing circuitry being configured to cause the terminal device to:
measure on a synchronization signal block transmitted by at least one neighboring radio access network node, thereby obtaining information identifying cross-link interference pertaining to wireless transmission from the at least one neighboring radio access network node, wherein the measuring is performed in accordance with a configuration provided by the network node, the configuration indicating that the measurements are for interference purposes by setting a threshold value for the measurements such that the terminal device is configured to only report measurements above the threshold value;
report, to the network node and in accordance with the configuration, the information of cross-link interference; and
acquire time division duplex (TDD) configuration information from the at least one neighboring radio access network node by decoding at least one system information block in time/frequency resources transmitted by the at least one neighboring radio access network node, the time/frequency resources being defined by the synchronization signal block, and wherein the information of cross-link interference is defined by the TDD configuration information.