Method of performing paging reception and related device
A method for a user equipment (UE) for performing a paging reception is provided. The method includes determining whether the UE registers to a first network associated with an Evolved Packet Core (EPC) network; determining whether to transmit a requested offset value for a paging occasion calculation to the first network after the UE determines that the UE registers to the first network; transmitting, to the first network, the requested offset value after the UE determines to transmit the requested offset value to the first network; receiving, from the first network, a configured offset value for the paging occasion calculation; forwarding, by a Non-Access-Stratum (NAS) layer of the UE, to a lower layer of the UE, the configured offset value; and performing the paging reception based on a first UE identity (ID), wherein the first UE ID is determined based on the configured offset value.
1. A method for a user equipment (UE) for performing a paging reception, the method comprising:
registering to a first network comprising an Evolved Packet Core (EPC) network and a second network comprising a 5G core (5GC) network using a first Universal Subscriber Identity Module (USIM) and a second USIM, respectively;
selecting one of the first network and the second network to prevent a paging collision on the first network and the second network;
when the first network is selected:
determining, based on a current UE identity (ID), an offset value for a paging occasion calculation;
transmitting, by the first USIM, to the first network, the offset value via a tracking area update procedure or via an attach procedure;
receiving, by the first USIM, from the first network, a configured offset value for the paging occasion calculation;
forwarding, by a Non-Access-Stratum (NAS) layer of the UE, to a lower layer of the UE, the configured offset value;
determining a first UE ID based on the configured offset value; and
performing the paging reception based on the first UE ID; and
when the second network is selected:
initiating a UE ID reassignment procedure with the second network, the UE ID reassignment procedure comprising a registration procedure;
receiving, by the second USIM, from an Access and Mobility Management Function (AMF) of the second network, a second UE ID via the UE ID reassignment procedure;
forwarding, by the NAS layer of the UE, to the lower layer of the UE, the second UE ID; and
performing the paging reception based on the second UE ID.
2. The method of claim 1 , wherein the offset value and the configured offset value are different.
3. The method of claim 1 , wherein the offset value and the configured offset value are the same.
4. The method of claim 1 , further comprising, before transmitting, to the first network, the offset value:
receiving, from the first network, a signal indicating that the first network supports receiving the offset value.
5. The method of claim 1 , further comprising:
registering to a third network comprising the 5GC network by a third USIM;
determining to initiate the UE ID reassignment procedure with the third network;
receiving, by the third USIM, from the third network, a third UE ID via the UE ID reassignment procedure after the UE determines to initiate the UE ID reassignment procedure;
forwarding, by the NAS layer of the UE, to the lower layer of the UE, the third UE ID; and
performing the paging reception based on the third UE ID.
6. The method of claim 1 , further comprising, before transmitting, to the first network, the offset value:
determining that a paging occasion collision has occurred when the UE registers to the first network and the second network.
7. A user equipment (UE) for performing a paging reception, the UE comprising:
a processor for executing a computer-executable program; and
a memory, coupled to the processor, for storing the computer-executable program, wherein the computer-executable program, when executed by the processor, cause the processor to:
register to a first network comprising an Evolved Packet Core (EPC) network and a second network comprising a 5G core (5GC) network using a first Universal Subscriber Identity Module (USIM) and a second USIM, respectively;
select one of the first network and the second network to prevent a paging collision on the first network and the second network;
when the first network is selected:
determine, based on a current UE identity (ID), an offset value for a paging occasion calculation;
transmit, by the first USIM, to the first network, the offset value via a tracking area update procedure or via an attach procedure;
receive, by the first USIM, from the first network, a configured offset value for the paging occasion calculation;
forward, by a Non-Access-Stratum (NAS) layer of the UE, to a lower layer of the UE, the configured offset value;
determine a first UE ID based on the configured offset value; and
perform the paging reception based on the first UE ID; and
when the second network is selected:
initiate a UE ID reassignment procedure with the second network, the UE ID reassignment procedure comprising a registration procedure;
receive, by the second USIM, from an Access and Mobility Management Function (AMF) of the second network, a second UE ID via the UE ID reassignment procedure;
forward, by the NAS layer of the UE, to the lower layer of the UE, the second UE ID; and
perform the paging reception based on the second UE ID.
8. The UE of claim 7 , wherein the offset value and the configured offset value are different.
9. The UE of claim 7 , wherein the offset value and the configured offset value are the same.
10. The UE of claim 7 , wherein the computer-executable program, when executed by the processor, further cause the processor to:
before transmitting, to the first network, the offset value, receive, from the first network, a signal indicating that the first network supports receiving the offset value.
11. The UE of claim 7 , wherein the computer-executable program, when executed by the processor, further cause the processor to:
register to a third network comprising the 5GC network by a third USIM;
determine to initiate the UE ID reassignment procedure with the third network;
receive, by the third USIM, from the third network, a third UE ID via the UE ID reassignment procedure after the UE determines to initiate the UE ID reassignment procedure;
forward, by the NAS layer of the UE, to the lower layer of the UE, the third UE ID; and
perform the paging reception based on the third UE ID.
12. The UE of claim 7 , wherein the computer-executable program, when executed by the processor, further cause the processor to:
before transmitting, to the first network, the offset value, determine that a paging occasion collision has occurred when the UE registers to the first network and the second network.