Method and apparatus for slice aware cell reselection in a wireless communication system
A method and apparatus for slice-aware cell reselection in a wireless communication system is provided. A wireless device acquires network slice information. A wireless device performs slice-aware cell reselection based on both the network slice information and cell quality. Based on determining that a quality of a current cell is lower than or equal to a threshold value, a wireless device performs cell reselection based on only the cell quality.
1 . A method, comprising,
receiving, by a wireless device from a network, first information related to slice-based cell reselection,
wherein the first information related to slice-based cell reselection includes (i) priority of frequency, (ii) information related to one or more slices, and (iii) information related to at least one frequency which is associated with each slice;
receiving, by the wireless device from the network, information related to a threshold value for a quality of a serving cell via a system information block type 2;
receiving, by the wireless device from the network, second information related to cell reselection regardless of a slice;
receiving, by the wireless device from the network, slice restriction information including information related to a specific area and/or a specific time period, wherein one or more slices are valid only in the specific area and/or the specific time period; and
based on that a cell reselection procedure is initiated, determining, by the wireless device, whether to consider a slice for the cell reselection procedure based on a quality of the serving cell;
based on a quality of the serving cell is higher than or equal to the threshold value:
selecting, by the wireless device, a valid slice for a suspended service among the one or more slices based on the slice restriction information;
performing, by the wireless device, a slice-based cell reselection procedure based on (i) measurement results for cells of one or more frequencies which support the selected valid slice and (ii) the first information;
based on the quality of the serving cell is lower than the threshold value:
performing, by the wireless device, a cell reselection procedure regardless of a slice without transitioning to an any cell state, based on (i) measurement results for cells of one or more frequencies regardless of a slice and (ii) the second information.
2 . The method of claim 1 ,
wherein the wireless device is in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.
3 . A wireless device, comprising:
a transceiver;
a memory; and
at least one processor operatively coupled to the transceiver and the memory, and configured to perform operations, the operations comprising:
receiving, from a network, first information related to slice-based cell reselection,
wherein the first information related to slice-based cell reselection includes (i) priority of frequency, (ii) information related to one or more slices, and (iii) information related to at least one frequency which is associated with each slice;
receiving, from the network, information related to a threshold value for a quality of a serving cell via a system information block type 2;
receiving, from the network, second information related to cell reselection regardless of a slice;
receiving, from the network, slice restriction information including information related to a specific area and/or a specific time period, wherein one or more slices are valid only in the specific area and/or the specific time period; and
based on that a cell reselection procedure is initiated, determining whether to consider a slice for the cell reselection procedure based on a quality of the serving cell;
based on a quality of the serving cell is higher than or equal to the threshold value:
selecting a valid slice for a suspended service among the one or more slices based on the slice restriction information;
performing a slice-based cell reselection procedure based on (i) measurement results for cells of one or more frequencies which support the selected valid slice and (ii) the first information;
based on the quality of the serving cell is lower than the threshold value:
performing a cell reselection procedure regardless of a slice without transitioning to an any cell state, based on (i) measurement results for cells of one or more frequencies regardless of a slice and (ii) the second information.
4 . A non-transitory computer-readable medium having stored thereon a plurality of instructions, which, when executed by a processor of a wireless device, cause the wireless device to perform operations, the operations comprise,
receiving, from a network, first information related to slice-based cell reselection,
wherein the first information related to slice-based cell reselection includes (i) priority of frequency, (ii) information related to one or more slices, and (iii) information related to at least one frequency which is associated with each slice;
receiving, from the network, information related to a threshold value for a quality of a serving cell via a system information block type 2;
receiving, from the network, second information related to cell reselection regardless of a slice;
receiving, from the network, slice restriction information including information related to a specific area and/or a specific time period, wherein one or more slices are valid only in the specific area and/or the specific time period; and
based on that a cell reselection procedure is initiated, determining whether to consider a slice for the cell reselection procedure based on a quality of the serving cell;
based on a quality of the serving cell is higher than or equal to the threshold value:
selecting a valid slice for a suspended service among the one or more slices based on the slice restriction information;
performing a slice-based cell reselection procedure based on (i) measurement results for cells of one or more frequencies which support the selected valid slice and (ii) the first information;
based on the quality of the serving cell is lower than the threshold value:
performing a cell reselection procedure regardless of a slice without transitioning to an any cell state, based on (i) measurement results for cells of one or more frequencies regardless of a slice and (ii) the second information.