Adaptive bandwidth usage at radar congestion for OFDM systems

1 . A method performed by a network node, the method comprising:

detecting a radar signal in at least a first subchannel within a plurality of subchannels within an operating channel used by at least one wireless device, wherein the first subchannel includes a synchronization signal or system information; and

in response to detecting the radar signal in at least the first subchannel, scheduling transmission of at least one signal in at least a second subchannel of the plurality of subchannels within the operating channel that is different from the at least first subchannel in which the radar signal was detected, wherein the at least one signal comprises the synchronization signal or system information signal;

allocating at least one resource for the transmission of the synchronization signal or system information signal in the at least second subchannel other than the at least first subchannel in which the radar signal was detected; and

transmitting, to the at least one wireless device, a message comprising a new configuration for the at least second subchannel, the new configuration excluding the at least first subchannel in which the radar signal was detected and indicating the at least one resource for the transmission of the synchronization signal or system information signal on the at least second subchannel to enable the at least one wireless device to continue using the operating channel without the at least first subchannel in which the radar signal was detected.

2 . A network node comprising:

processing circuitry configured to:

detect a radar signal in at least a first subchannel within a plurality of subchannels within an operating channel used by at least one wireless device, wherein the first subchannel includes a synchronization signal or system information; and

in response to detecting the radar signal in at least the first subchannel, schedule transmission of at least one signal in at least a second subchannel of the plurality of subchannels within the operating channel that is different from the at least first subchannel in which the radar signal was detected;

wherein the at least one signal comprises the synchronization signal or system information signal;

allocate at least one resource for the transmission of the synchronization signal or system information signal in the at least second subchannel other than the at least first subchannel in which the radar signal was detected; and

transmit, to the at least one wireless device, a message comprising a new configuration for the at least second subchannel, the new configuration excluding the at least first subchannel in which the radar signal was detected and indicating the at least one resource for the transmission of the synchronization signal or system information signal on the at least second subchannel to enable the at least one wireless device to continue using the operating channel without the at least first subchannel in which the radar signal was detected.

3 . The network node of claim 2 wherein the operating channel comprises a total bandwidth, and the processing circuitry is configured to divide the operating channel into the plurality of subchannels, wherein each subchannel is associated with a portion of the total bandwidth.

4 . The network node of claim 3 , wherein when detecting the radar signal in the at least first subchannel within the plurality of subchannels within the operating channel the processing circuitry is configured to perform one Dynamic Frequency Selection (DFS) procedure on the total bandwidth of the operating channel.

5 . The network node of claim 3 , wherein when detecting the radar signal in the at least first subchannel within the plurality of subchannels within the operating channel the processing circuitry is configured to perform one of a plurality of DFS procedures on each of the plurality of subchannels within the operating channel.

6 . The network node of claim 3 , wherein:

the operating channel comprises plurality of channels comprise a total number of contiguous physical resource blocks, and

when dividing the operating channel into the plurality of subchannels the processing circuitry is configured to divide the total number of physical resource blocks into a plurality of groups of distinct physical resource block groups.

7 . The network node of claim 3 , wherein:

the operating channel comprises a total number of resource units, and

when dividing the operating channel into the plurality of subchannels the processing circuitry is configured to divide the total number of resource units into a plurality of groups of distinct resource unit groups.

8 . The network node of claim 7 , wherein each resource unit comprises one or more OFDM tones.

9 . The network node of claim 2 , wherein each of the plurality of subchannels are associated with a respective one of a plurality of subcarriers.

10 . The network node of claim 2 , wherein when scheduling the transmission of the at least one signal in the at least second subchannel other than the at least first subchannel in which the radar signal was detected the processing circuitry is configured to replace a previous allocation of at least one resource associated with the at least first subchannel in which the radar signal was detected with a new allocation of at least one resource associated with the at least second subchannel other than the at least first subchannel in which the radar signal was detected.

11 . The network node of claim 2 , wherein the processing circuitry is configured to cease transmission of at least one signal in the at least first subchannel in which the radar signal was detected in response to detecting the radar signal.

12 . The network node of claim 2 , wherein the at least one signal comprises a network signal, and the processing circuitry is configured to:

determine that the radar signal interferes with the network signal scheduled for transmission within the first subchannel.

13 . The network node of claim 2 , wherein when transmitting the message comprising the new configuration for the channel to the at least one wireless device the processing circuitry is configured to transmit the new configuration to all wireless devices in a cell.

14 . The network node of claim 2 , wherein the processing circuitry is configured to:

prior to transmitting the new configuration, cease transmission of all signals within the plurality of subchannels to eliminate interference with the radar signal; and

resume transmission of the at least one signal in at least the second subchannel after the new configuration is transmitted to the wireless device.