Method and apparatus for monitoring user equipment reachability in wireless communication system
Disclosed herein are a method and apparatus for monitoring UE reachability in a wireless communication system. A method for monitoring UE reachability may include receiving, by a Mobility Management Entity, a monitoring request message for UE reachability including a maximum response time from a Home Subscriber Server, detecting, by the MME, the UE reachability if it is expected that paging is able to be transmitted to UE when extended Discontinuous Reception is applied to the UE, and sending, by the MME, a UE reachability notification to a Service Capability Exposure Function before a next paging occasion of the UE, wherein the maximum response time may indicate a time during which the UE maintains a reachable state so that downlink data is reliably delivered to the UE, and wherein an occasion when the UE reachability notification is transmitted may be determined by taking into consideration the maximum response time.
1. A method for monitoring a user equipment (UE) in a wireless communication system, the method performed by a first network node device, the first network node device including a transceiver, a processor and a memory, the method comprising:
detecting, a monitoring event which is when the UE will become reachable for paging; and
transmitting, to a third network node, a second message related to the monitoring event,
wherein the UE uses an extended idle mode Discontinuous Reception (DRX),
wherein the extended idle mode DRX is used for reducing the UE's power consumption by monitoring the network for paging based on an extended idle mode DRX cycle value, and
wherein a range of the extended idle mode DRX cycle value is configured to a maximum value greater than a legacy DRX cycle value.
2. The method of claim 1 , further comprising:
receiving, from a second network node, a first message including a time duration, the time duration indicating a time for which the UE stays reachable to allow a server to reliably deliver the required downlink data,
wherein the monitoring event is detected after receiving the first message.
3. The method of claim 2 ,
wherein the second message is transmitted based on the time duration.
4. The method of claim 2 ,
wherein the time duration is used to determine how early the second message should be transmitted before a paging occasion occurs of the UE.
5. The method of claim 2 ,
wherein the time duration is configured so that downlink data can be transmitted from a server to the UE based on when the UE will become reachable.
6. The method of claim 1 ,
wherein the third network node is an entity to determine whether an Application is authorized to send requests for a 3GPP Network Entity.
7. The method of claim 1 ,
wherein the second message is sent to the third network node if the monitoring event was caused by the UE changing to connected mode.
8. A first network node device for monitoring a user equipment (UE) reachability in a wireless communication system, the first network node comprising: a transceiver; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising: detecting, a monitoring event which is when the UE will become reachable for paging; and transmitting, via the transceiver to a third network node, a second message related to the monitoring event, wherein the UE uses an extended idle mode Discontinuous Reception (DRX), wherein the extended idle mode DRX is used for reducing the UE's power consumption by monitoring the network for paging based on an extended idle mode DRX cycle value, and wherein a range of the extended idle mode DRX cycle value is configured to a maximum value greater than a legacy DRX cycle value.
9. The first network node device of claim 8 , wherein the operations further comprising:
receiving, via transceiver from a second network node, a first message including a time duration, the time duration indicating a time for which the UE stays reachable to allow a server to reliably deliver the required downlink data,
wherein the monitoring event is detected after receiving the first message.
10. The first network node device of claim 9 ,
wherein the second message is transmitted based on the time duration.
11. The first network node device of claim 9 ,
wherein the time duration is used to determine how early the second message should be transmitted before a paging occasion occurs of the UE.
12. The first network node device of claim 9 ,
wherein the time duration is configured so that downlink data can be transmitted from a server to the UE based on when the UE will become reachable.
13. The first network node device of claim 8 ,
wherein the third network node is an entity to determine whether an Application is authorized to send requests for a 3GPP Network Entity.
14. The first network node device of claim 8 ,
wherein the second message is sent to the third network node if the monitoring event was caused by the UE changing to connected mode.
15. A user equipment (UE) for monitoring the user equipment reachability in a wireless communication system, the UE comprising:
a transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
configuring a range of an extended idle mode Discontinuous Reception (DRX) cycle value to a maximum of several tens of minutes greater than a legacy DRX cycle value;
transmitting, via the transceiver to a first network node, an indication related with the UE reachability; and
receiving, via the transceiver from the first network node, a paging message;
wherein the first network node transmits to a third network node, a second message related a monitoring event, based on detecting the monitoring event which is when the UE will become reachable for paging,
wherein the UE uses the extended idle mode DRX, and
wherein the extended idle mode DRX is used for reducing the UE's power consumption by monitoring the network for paging based on an extended idle mode DRX cycle value.
16. The UE of claim 15 , wherein the extended idle mode DRX cycle value is included in Non Access Stratum (NAS) response message.