Wireless communication handover responsive to uplink interference at a serving cell
A wireless communication network hands-over wireless User Equipment (UE) from a serving cell to a neighbor cell. The serving cell wirelessly exchanges data with the wireless UE and determines uplink interference for a radio band. The serving cell wirelessly transfers an uplink interference offset to the wireless UE that indicates the uplink interference at the serving cell for the radio band. The wireless UE uses the uplink interference offset to trigger a handover request to the serving cell. The handover request indicates downlink signal strength at the wireless UE for the serving cell. The serving cell initiates a handover to a neighbor cell responsive to a combination of the downlink signal strength at the wireless UE and the uplink interference for the serving cell falling below a handover threshold. After the handover, the neighbor cell wirelessly exchanges data with the wireless UE over a different radio band.
1. A method of operating a wireless communication network to handover wireless User Equipment (UE) from a serving cell to a neighbor cell, the method comprising:
the serving cell wirelessly exchanging data with the wireless UE over a serving radio band;
the serving cell determining uplink interference at the serving cell for the serving radio band and determining an average uplink interference value at the neighbor cell for a different radio band;
the serving cell wirelessly transferring an uplink interference offset to the wireless UE that indicates the uplink interference at the serving cell for the serving radio band and the average uplink interference value at the neighbor cell for the different radio band, wherein the wireless UE uses the uplink interference offset to trigger a handover request to the serving cell that indicates downlink signal strength at the wireless UE for the serving cell and the serving radio band and another downlink signal strength at the wireless UE for the neighbor cell and the different radio band;
the serving cell initiating a handover to a neighbor cell responsive to a combination of the downlink signal strength at the wireless UE and the uplink interference for the serving cell falling below a handover threshold and to another combination of the other downlink signal strength at the wireless UE for the neighbor cell and the average uplink interference value at the neighbor cell for the different radio band exceeding another handover threshold; and
the neighbor cell wirelessly exchanging additional data with the wireless UE after the handover.
2. The method of claim 1 wherein the handover threshold comprises a Fifth Generation New Radio (5GNR) A5-1 threshold.
3. The method of claim 1 wherein the handover threshold comprises a Long Term Evolution (LTE) A5-1 threshold.
4. The method of claim 1 wherein the serving cell initiating the handover to the neighbor cell responsive to the combination of the downlink signal strength and the uplink interference for the serving cell falling below the handover threshold comprises initiating the handover to the neighbor cell responsive to a combination of the downlink signal strength, the uplink interference, and a hysteresis value for the serving cell falling below the handover threshold.
5. The method of claim 1 wherein the uplink interference offset comprises a measurement object specific offset for the serving cell.
6. The method of claim 1 wherein the uplink interference offset accelerates the handover when the uplink interference has increased and decelerates the handover when the uplink interference has decreased.
7. The method of claim 1 wherein the handover comprises an inter-band handover from the radio band to the different radio band.
8. The method of claim 1 wherein the average uplink interference value at the neighbor cell comprises a measurement object specific offset for the neighbor cell.
9. A wireless communication network to handover wireless User Equipment (UE) from a serving cell to a neighbor cell, the wireless communication network comprising:
the serving cell configured to wirelessly exchange data with the wireless UE over a radio band, determine uplink interference at the serving cell for the radio band, determine an average uplink interference value at the neighbor cell for a different radio band, and wirelessly transfer an uplink interference offset to the wireless UE that indicates the uplink interference at the serving cell for the radio band and the average uplink interference value at the neighbor cell for the different radio band, wherein the wireless UE is configured to use the uplink interference offset to trigger a handover request to the serving cell that indicates downlink signal strength at the wireless UE for the serving cell and another downlink signal strength at the wireless UE for the neighbor cell;
the serving cell configured to initiate a handover to a neighbor cell responsive to a combination of the downlink signal strength at the wireless UE and the uplink interference for the serving cell falling below a handover threshold and to another combination of the other downlink signal strength at the wireless UE and the average uplink interference value for the neighbor cell exceeding another handover threshold; and
the neighbor cell configured to wirelessly exchange additional data with the wireless UE after the handover.
10. The wireless communication network of claim 9 wherein the handover threshold comprises a Fifth Generation New Radio (5GNR) A5-1 threshold.
11. The wireless communication network of claim 9 wherein the handover threshold comprises a Long Term Evolution (LTE) A5-1 threshold.
12. The wireless communication network of claim 9 wherein the serving cell is configured to initiate the handover to the neighbor cell responsive to a combination of the downlink signal strength, the uplink interference, and a hysteresis value for the serving cell falling below the handover threshold.
13. The wireless communication network of claim 9 wherein the uplink interference offset comprises a measurement object specific offset for the serving cell.
14. The wireless communication network of claim 9 wherein the uplink interference offset will accelerate the handover when the uplink interference is increased and decelerate the handover when the uplink interference is decreased.
15. The wireless communication network of claim 9 wherein the handover comprises an inter-band handover from the radio band to the different radio band.
16. The wireless communication network of claim 9 wherein the average uplink interference value at the neighbor cell comprises a measurement object specific offset for the neighbor cell.