Method for estimating mobility state of UE and device supporting the same
Provided are a method of estimating mobility state of UE and a device supporting the method. According to one embodiment of the present disclosure, the method includes: receiving information on neighbor cell from a serving cell, wherein the information informs to which group the neighbor cell belongs; performing cell change from the serving cell to the neighbor cell; when the neighbor cell belongs to a first group, counting the cell change; when the neighbor cell belongs to a second group, skipping counting the cell change; and reporting a number of counted cell change for estimating mobility state of the UE, wherein the first group and the second group are configured based on altitude of the UE.
1. A method performed by a user equipment (UE) operating in a wireless communication system, the method comprising:
camping on a first cell;
receiving, from the first cell, information related to neighbor cells including a second cell and a third cell,
wherein the information related to the neighbor cells includes tier information for the neighbor cells that is configured for an aerial UE and a ground UE, respectively;
performing a first cell change from the first cell to the second cell;
counting the first cell change for estimating a mobility state of the UE;
performing a second cell change from the second cell to the third cell;
estimating the mobility state of the UE based on i) the counted first cell change and ii) whether the second cell change is counted or not according to the tier information for the neighbor cells that is configured for the aerial UE, based on the UE being the aerial UE but not being the ground UE,
wherein the second cell change is counted based on the information related to the third cell informing that the third cell belongs to a second tier different from a first tier to which the second cell belongs,
wherein the second cell change is not counted based on the information related to the third cell informing that the third cell belongs to the first tier to which the second cell belongs,
wherein the mobility state of the UE is estimated as a medium-mobility state based on number of cell reselections during time period T CRmax exceeding a neighbor cell reselection medium-mobility state count value (N CR_M ) and not exceeding a neighbor cell reselection high-mobility state count value (N CR_H ),
wherein the mobility state of the UE is estimated as a high-mobility state based on the number of cell reselections during the time period TCRmax exceeding NCR_H,
applying a speed dependent scaling rule based on the mobility state of the UE being estimated as the medium-mobility state or the high-mobility state,
wherein the first tier includes at least one neighbor cell surrounding the first cell,
wherein the second tier includes at least one neighbor cell surrounding the at least one neighbor cell from the first tier, and
wherein the tier information configured for the aerial UE includes more neighbor cells than the tier information configured for the ground UE.
2. The method of claim 1 , wherein the information related to the neighbor cells includes a threshold for which the tier information is applied.
3. The method of claim 2 ,
wherein the threshold is related to an altitude of the UE, and
wherein the tier information is applied based on the altitude of the UE being higher than the threshold.
4. The method of claim 2 ,
wherein the threshold is related to a number of detected neighbor cells, and
wherein the tier information is applied based on the number of detected neighbor cells being above the threshold.
5. The method of claim 1 , wherein the UE is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the UE.
6. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising:
a transceiver;
a processor; and
a memory operably connectable to the processor and storing instructions that, based on being executed by the processor, perform operations comprising:
camping on a first cell;
receiving, from the first cell using the transceiver, information related to neighbor cells including a second cell and a third cell,
wherein the information related to the neighbor cells includes tier information for the neighbor cells that is configured for an aerial UE and a ground UE, respectively;
performing a first cell change from the first cell to the second cell;
counting the first cell change for estimating a mobility state of the UE;
performing a second cell change from the second cell to the third cell;
estimating the mobility state of the UE based on i) the counted first cell change and ii) whether the second cell change is counted or not according to the tier information for the neighbor cells that is configured for the aerial UE, based on the UE being the aerial UE but not being the ground UE,
wherein the second cell change is counted based on the information related to the third cell informing that the third cell belongs to a second tier different from a first tier to which the second cell belongs,
wherein the second cell change is not counted based on the information related to the third cell informing that the third cell belongs to the first tier to which the second cell belongs,
wherein the mobility state of the UE is estimated as a medium-mobility state based on number of cell reselections during time period T CRmax exceeding a neighbor cell reselection medium-mobility state count value (N CR_M ) and not exceeding a neighbor cell reselection high-mobility state count value (N CR_H ),
wherein the mobility state of the UE is estimated as a high-mobility state based on number of cell reselections during the time period TCRmax exceeding N CR_H ,
applying a speed dependent scaling rule based on the mobility state of the UE being estimated as the medium-mobility state or the high-mobility state,
wherein the first tier includes at least one neighbor cell surrounding the at least one neighbor cell from the first cell,
wherein the second tier includes at least one neighbor cell surrounding the first tier, and
wherein the tier information configured for the aerial UE includes more neighbor cells than the tier information configured for the ground UE.
7. The UE of claim 6 , wherein the information related to the neighbor cells includes a threshold for which the tier information is applied.
8. The UE of claim 7 ,
wherein the threshold is related to an altitude of the UE, and
wherein the tier information is applied based on the altitude of the UE being higher than the threshold.
9. The UE of claim 7 ,
wherein the threshold is related to a number of detected neighbor cells, and
wherein the tier information is applied based on the number of detected neighbor cells being above the threshold.
10. A processing apparatus operating in a wireless communication system, the apparatus comprising:
a processor; and
a memory operably connectable to the at least one processor, wherein the processor is configured to perform operations comprising:
obtaining, from a first cell, information related to neighbor cells including a second cell and a third cell,
wherein the information related to the neighbor cells includes tier information for the neighbor cells that is configured for an aerial UE and a ground UE, respectively;
performing a first cell change from the first cell to the second cell;
counting the first cell change for estimating a mobility state of the UE;
performing a second cell change from the second cell to the third cell;
estimating the mobility state of the UE based on i) the counted first cell change and ii) whether the second cell change is counted or not according to the tier information for the neighbor cell that is configured for the aerial UE, based on the UE being the aerial UE but not being the ground UE,
wherein the second cell change is counted based on the information related to the third cell informing that the third cell belongs to a second tier different from a first tier to which the second cell belongs,
wherein the second cell change is not counted based on the information related to the third cell informing that the third cell belongs to the first tier to which the second cell belongs,
wherein the mobility state of the UE is estimated as a medium-mobility state based on number of cell reselections during time period T CRmax exceeding a neighbor cell reselection medium-mobility state count value (N CR_M ) and not exceeding a neighbor cell reselection high-mobility state count value (N CR_H ),
wherein the mobility state of the UE is estimated as a high-mobility state based on number of cell reselections during the time period TCRmax exceeding NCR_H,
applying a speed dependent scaling rule based on the mobility state of the UE being estimated as the medium-mobility state or the high-mobility state,
wherein the first tier includes at least one neighbor cell surrounding the first cell,
wherein the second tier includes at least one neighbor cell surrounding the at least one neighbor cell from the first tier, and
wherein the tier information configured for the aerial UE includes more neighbor cells than the tier information configured for the ground UE.