| CPC H04W 36/0058 (2018.08) [H04W 36/00837 (2018.08); H04W 36/08 (2013.01); H04W 76/30 (2018.02)] | 1 Claim |
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1. An apparatus, comprising:
at least one processor; and
at least one memory including computer program code that causes the at least one processor, when executed thereby, to direct a user equipment (UE) to perform operations that include:
receive handover configuration information from a first network node of a plurality of network nodes, the first network node being a serving cell of the UE, and the handover configuration information including at least mapping information and one or more rules associated with prioritization of neighbor cells, wherein the plurality of network nodes are non-terrestrial network (NTN) nodes, wherein the handover configuration information is received, via a multicast from the first network node, using radio resource control (RRC) connection reconfiguration or RRC connection release messages, wherein the mapping information maps a rate of change values to timeToPreTrigger values, and wherein the mapping information is associated with serving cell-neighbor cell combinations, and wherein the mapping information and the one or more rules are based on satellite constellation configuration information and satellite ephemeris data;
estimate rate of change values of reference signal (RS) difference measurements, a reference signal difference measurement being a difference in reference signal measurements between the first network node and a second network node of one or more second network nodes, the one or more second network nodes of the plurality of network nodes being neighbor cells, wherein the reference signal difference measurements include differences in reference signal received power (RSRP) and/or reference signal received quality (RSRQ) values of the first network node and the one or more second network nodes;
compare the rate of change values with the mapping information received from the first network node, and compare the rate of change values estimated with the mapping information received from the first network node;
determine one or more timeToPreTrigger values based on the comparison;
initiate one or more timeToPreTrigger timers based on the corresponding one or more timeToPreTrigger values, the one or more timeToPreTrigger timers corresponding to different second network nodes;
generate one or more measurement reports upon expiration of the one or more timeToPreTrigger timers, wherein a measurement report of the one or more measurement reports includes cell identifiers and corresponding timeToPreTrigger values of the one or more second network nodes;
transmit the one or more measurement reports to the first network node;
receive an indication from the first network node about a second network node of the one or more second network nodes for performing a handover, the indication determined based at least on the one or more measurement reports; and
perform the handover from the first network node to the second network node based on the indication received from the first network node.
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