US 12,262,257 B2
Methods and systems for multiple cell target conditional handover
Hans Thomas Höhne, Helsinki (FI); Ahmad Awada, Munich (DE); and Faranaz Sabouri-Sichani, Aalborg (DK)
Assigned to Nokia Technologies Oy, Espoo (FI)
Appl. No. 17/622,258
Filed by Nokia Technologies Oy, Espoo (FI)
PCT Filed Jul. 8, 2020, PCT No. PCT/FI2020/050487
§ 371(c)(1), (2) Date Dec. 23, 2021,
PCT Pub. No. WO2021/009410, PCT Pub. Date Jan. 21, 2021.
Claims priority of provisional application 62/873,285, filed on Jul. 12, 2019.
Prior Publication US 2022/0256415 A1, Aug. 11, 2022
Int. Cl. H04W 36/00 (2009.01); H04B 17/382 (2015.01); H04L 12/413 (2006.01); H04W 36/30 (2009.01); H04W 36/36 (2009.01); H04B 17/318 (2015.01)
CPC H04W 36/0058 (2018.08) [H04B 17/382 (2015.01); H04L 12/413 (2013.01); H04W 36/00698 (2023.05); H04W 36/00837 (2018.08); H04W 36/30 (2013.01); H04W 36/304 (2023.05); H04W 36/362 (2023.05); H04B 17/318 (2015.01); H04W 36/00838 (2023.05)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a source cell;
a user equipment;
at least one processor; and
at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the user equipment to:
receiving measurement report from the user equipment, the measurement report comprising an aggregate measurement of cells that belong to a target configuration and provide dual connectivity;
based on the measurement report:
determining to use a conditional handover to hand off the user equipment; and
determine a particular configuration of a target;
preparing a first target cell from the particular configuration for the conditional handover by generating and sending a conditional handover request to the first target cell, the conditional handover request comprising the particular configuration and an aggregate condition of multiple cells in the target, the aggregate condition comprising an algorithm and parameters that determines how the user equipment evaluates multiple cells of the target, the selection of the algorithm and is based on capabilities of the user equipment, Quality of Service (QOS) requirements, cell maximal capacities, and system load, the parameters comprising: which cells are to be summed, at least one performance margin to be applied, reference signal received power, reference signal received quality, a signal to interference and noise ratio as measurements, a listen-before-talk failure rate, a received signal strength indicator, and a channel occupancy from the multiple cells;
receiving, from a first cell, a conditional handover acknowledgement confirming the particular configuration for the first cell and a second cell;
receiving measurements from the first cell and the second cell;
based on the measurements, determine the aggregate condition is satisfied; and
based on determining the aggregate condition is satisfied, performing access to the first cell using random access procedure.