| CPC H04W 76/15 (2018.02) [H04W 24/10 (2013.01); H04W 48/18 (2013.01)] | 10 Claims |

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1. A method, comprising:
configuring, by a wireless device, multiple network slices;
receiving, by the wireless device, network slice information related to the multiple network slices, wherein the network slice information informs one or more network slices supported by each frequency among the multiple network slices;
establishing, by the wireless device, a packet data unit session for a specific service, wherein the packet data unit session uses at least one network slice;
configuring, by the wireless device, a validity area for the at least one network slice used by the packet data unit session;
determining, by the wireless device, an available network slice for the specific service, based on that i) the available network slice is used by the packet data unit session for the specific service, and ii) the wireless device is located in the validity area for the available network slice;
determining, by the wireless device, the one or more frequencies that support the available network slice among the multiple network slices;
performing, by the wireless device, measurement on the determined one or more frequencies, i) while being in idle state or inactive state and ii) while being located in the validity area for the available network slice;
skipping, by the wireless device, performing measurement on the determined one or more frequencies, i) while being not in idle state or inactive state or ii) while being not located in the validity area for the available network slice;
reporting, by the wireless device, measurement results on the determined one or more frequencies; and
receiving, by the wireless device, a carrier aggregation and/or a dual connectivity configuration related to the available network slice for establishing a fast carrier aggregation and/or a fast dual connectivity in response to the reported measurement results.
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