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US-20260129616-A1 - METHOD AND APPARATUS FOR ADAPTIVE WTRU REACHABILITY IN A WIRELESS NETWORK

US20260129616A1US 20260129616 A1US20260129616 A1US 20260129616A1US-20260129616-A1

Abstract

Methods and apparatus for adaptative WTRU reachability in a wireless network are described. A wireless transmit/receive unit (WTRU) includes a processor and a transceiver, which are configured to connected to a wireless network and send a first message, via the wireless network. The first message includes information indicating that the WTRU will not monitor a paging channel of the wireless network when the WTRU is in an idle state. The processor and the transceiver also receive a second message, via the wireless network. The second message includes information indicating a reachability strategy for the WTRU, which includes paging the WTRU via an alternate source when the WTRU is in the idle state.

Inventors

  • Michel Roy
  • Michael Starsinic
  • Ulises Olvera-Hernandez
  • Saad Ahmad

Assignees

  • INTERDIGITAL PATENT HOLDINGS, INC.

Dates

Publication Date
20260507
Application Date
20241107

Claims (20)

  1. 1 . A wireless transmit/receive unit (WTRU) comprising: a transceiver; and a processor, wherein the transceiver and the processor are configured to connect to a wireless network, wherein the transceiver and the processor are further configured to send a first message, via the wireless network, wherein the first message comprises information indicating that the WTRU will not monitor a paging channel of the wireless network when the WTRU is in an idle state, and wherein the transceiver and the processor are further configured to receive a second message, via the wireless network, wherein the second message comprises information indicating a reachability strategy for the WTRU, wherein the reachability strategy comprises paging the WTRU via an alternate source when the WTRU is in the idle state.
  2. 2 . The WTRU of claim 1 , wherein: the transceiver and the processor are further configured to disconnect the WTRU from the wireless network in the idle state, the transceiver and the processor are further configured to receive a third message, when the WTRU is in the idle state, via the alternate source, and the transceiver and the processor are further configured to re-establish connectivity of the WTRU with the wireless network based on information included in the third message.
  3. 3 . The WTRU of claim 2 , wherein: the third message comprises a paging notification that includes information indicating that the wireless network has downlink data for the WTRU, the transceiver and the processor are further configured to send a fourth message, to the wireless network, in response to the third message, wherein the fourth message comprises information indicating at least one protocol data unit (PDU) session to be activated or re-activated, and the transceiver and the processor are further configured to receive the downlink data from the wireless network in the at least one PDU session.
  4. 4 . The WTRU of claim 1 , wherein: the first message further comprises information indicating the alternate source for paging the WTRU when the WTRU is in the idle state, and configuration information for paging the WTRU via the alternate source, and wherein the transceiver and the processor are further configured to locally configure the WTRU to receive paging notifications via the alternate source when the WTRU is in the idle state.
  5. 5 . The WTRU of claim 4 , wherein the transceiver and the processor are further configured to locally configure the WTRU by at least one of: establishing connectivity with at least one of a server, a device or a network corresponding to the alternate source, or listening on a port for paging notifications from the alternate source.
  6. 6 . The WTRU of claim 1 , wherein the alternate source comprises at least one of a WiFi network, a radio access network (RAN), a personal Internet-of-Things network (PIN), an interworking gateway, ambient IoT (aIoT), an application function (AF), or a proximity services (Prose) relay.
  7. 7 . The WTRU of claim 1 , wherein the alternate source comprises a plurality of alternate sources, and the reachability strategy indicates an order in which the WTRU should attempt to use the plurality of alternate sources to receive paging notifications when the WTRU is in the idle state.
  8. 8 . The WTRU of claim 1 , wherein the first message further comprises information indicating capabilities of the WTRU for reaching other WTRUs for paging, wherein the information includes at least one of: information indicating that the WTRU is capable of acting as a mobile hotspot to send paging notifications to connected WTRUs, or information indicating that the WTRU is capable of acting as a proximity services (Prose) relay to send paging indications to the connected WTRUs.
  9. 9 . The WTRU of claim 1 , wherein the first message further comprises at least one of: information indicating a preferred one of the plurality of alternate sources for paging the WTRU when the WTRU is in the idle state, information indicating a preferred location for the WTRU to receive paging notifications when the WTRU is in the idle state, or information indicating at least one preferred IP port for the WTRU to receive paging notifications when the WTRU is in the idle state.
  10. 10 . A network node in a wireless network, the network node comprising: a transceiver, and a processor, wherein the transceiver and the processor are configured to receive a first message, from a wireless transmit/receive unit (WTRU) connected to the wireless network, wherein the first message comprises information indicating that the WTRU will not monitor a paging channel of the wireless network when the WTRU is in an idle state, and wherein the transceiver and the processor are further configured to send a second message, to the WTRU, wherein the second message comprises information indicating a reachability strategy for the WTRU, wherein the reachability strategy comprises paging the WTRU via an alternate source when the WTRU is in the idle state.
  11. 11 . The network node of claim 10 , wherein the first message further comprises information indicating the alternate source for paging the WTRU when the WTRU is in the idle state, and configuration information for paging the WTRU via the alternate source.
  12. 12 . The network node of claim 11 , wherein the alternate source comprises a plurality of alternate sources, and the reachability strategy indicates an order in which the WTRU should attempt to use the plurality of alternate sources to receive paging notifications when the WTRU is in the idle state.
  13. 13 . The network node of 10 , wherein the processor and the transceiver are further configured to determine the reachability strategy by: determining that data analytics services are to be used to assist in determining the reachability strategy, and obtaining data analytics services provided by at least one of: a network data and analytics function (NWDAF) of the cellular network, an application data analytics and enablement service (ADAES), or an artificial intelligence/machine learning enablement (AI/MLE) layer.
  14. 14 . The network node of claim 10 , wherein the alternate source comprises at least one of a WiFi network, a radio access network (RAN), a personal Internet-of-Things network (PIN), an interworking gateway, ambient IoT (aIoT), an application function (AF), or a proximity services (Prose) relay.
  15. 15 . A method, implemented in a wireless transmit/receive unit (WTRU), the method comprising: connecting to a wireless network; sending a first message, via the wireless network, wherein the first message comprises information indicating that the WTRU will not monitor a paging channel of the wireless network when the WTRU is in an idle state; and receiving a second message, via the wireless network, wherein the second message comprises information indicating a reachability strategy for the WTRU, wherein the reachability strategy comprises paging the WTRU via an alternate source when the WTRU is in the idle state.
  16. 16 . The method of claim 15 , further comprising: disconnecting the WTRU from the wireless network in the idle state; receiving a third message, when the WTRU is in the idle state, via the alternate source; and re-establishing connectivity of the WTRU with the wireless network based on information included in the third message.
  17. 17 . The method of claim 15 , wherein the third message comprises a paging notification that includes information indicating that the wireless network has downlink data for the WTRU, and the method further comprises: sending a fourth message, to the wireless network, in response to the third message, wherein the fourth message comprises information indicating at least one protocol data unit (PDU) session to be activated or re-activated; and receiving the downlink data from the wireless network in the at least one PDU session.
  18. 18 . The method of claim 15 , wherein the first message further comprises information indicating the alternate source for paging the WTRU when the WTRU is in the idle state, and configuration information for paging the WTRU via the alternate source, and wherein the method further comprises: locally configuring the WTRU to receive paging notifications via the alternate source when the WTRU is in the idle state.
  19. 19 . The method of claim 15 , wherein the locally configuring the WTRU further comprises at least one of: establishing connectivity with at least one of a server, a device or a network corresponding to the alternate source, or listening on a port for paging notifications from the alternate source.
  20. 20 . The method of claim 15 , wherein the alternate source comprises at least one of a WiFi network, a radio access network (RAN), a personal Internet-of-Things network (PIN), an interworking gateway, ambient IoT (aIoT), an application function (AF), or a proximity services (Prose) relay.

Description

BACKGROUND In wireless networks, such as Long Term Evolution (LTE) or 5G wireless networks, there are times when a wireless transmit/receive unit (WTRU) connected to the network is not actively engaged in a data session or call (also referred to herein as an active state). A WTRU may take advantage of the fact that it is not actively being used and may temporarily discontinue running certain processes to save power. Accordingly, a WTRU may enter a low power, standby mode of operation, commonly referred to as an idle state, in which the WTRU is still connected to the wireless network but may not be reachable solely using mechanisms that the wireless network would use when the WTRU is in the active state. When a WTRU is in an idle state, and there is an incoming call for the WTRU or downlink data that the network needs to send to the WTRU, the network may therefore need to use a different mechanism to reach the WTRU than it would when the WTRU is in the active state, to indicate, to the WTRU, an incoming call, short message system (SMS) message, or data notification, for example, that the WTRU needs to establish a signaling connection and user plane resources to receive. The process a wireless network typically uses to attempt to reach the WTRU when the WTRU is in the idle state is commonly referred to as paging. SUMMARY Methods and apparatus for adaptative WTRU reachability in a wireless network are described. A wireless transmit/receive unit (WTRU) includes a processor and a transceiver, which are configured to connect to a wireless network and send a first message, via the wireless network. The first message includes information indicating that the WTRU will not monitor a paging channel of the wireless network when the WTRU is in an idle state. The processor and the transceiver also receive a second message, via the wireless network. The second message includes information indicating a reachability strategy for the WTRU, which includes paging the WTRU via an alternate source when the WTRU is in the idle state. BRIEF DESCRIPTION OF THE DRAWINGS A more detailed understanding may be had from the following description, given by way of example in conjunction with the accompanying drawings, wherein like reference numerals in the figures indicate like elements, and wherein: FIG. 1A is a system diagram illustrating an example communications system in which one or more disclosed embodiments may be implemented; FIG. 1B is a system diagram illustrating an example wireless transmit/receive unit (WTRU) that may be used within the communications system illustrated in FIG. 1A according to an embodiment; FIG. 1C is a system diagram illustrating an example radio access network (RAN) and an example core network (CN) that may be used within the communications system illustrated in FIG. 1A according to an embodiment; FIG. 1D is a system diagram illustrating a further example RAN and a further example CN that may be used within the communications system illustrated in FIG. 1A according to an embodiment; FIG. 2 is a system diagram of a wireless network including a core network architecture with a tracking and reachability function (TRF); FIG. 3 is a signal diagram showing example reachability provisioning procedures between a WTRU and a TRF; FIG. 4 is a signal diagram showing example reachability procedures between a WTRU and a TRF via an AF; FIG. 5 is a signal diagram showing example reachability procedures between a WTRU and a TRF via alternative reachability sources; FIG. 6 is a flow diagram of an example method of provisioning WTRU reachability, which may be implemented in a WTRU; FIG. 7 is a flow diagram of an example method of paging a WTRU in an idle state when a reachability strategy has been provisioned for the WTRU, which may be implemented in a WTRU; and FIG. 8 is a flow diagram of an example method of provisioning WTRU reachability, which may be implemented at the tracking and reachability function in the core network, as shown in FIG. 2. DETAILED DESCRIPTION FIG. 1A is a diagram illustrating an example communications system 100 in which one or more disclosed embodiments may be implemented. The communications system 100 may be a multiple access system that provides content, such as voice, data, video, messaging, broadcast, etc., to multiple wireless users. The communications system 100 may enable multiple wireless users to access such content through the sharing of system resources, including wireless bandwidth. For example, the communications systems 100 may employ one or more channel access methods, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), single-carrier FDMA (SC-FDMA), zero-tail unique-word discrete Fourier transform Spread OFDM (ZT-UW-DFT-S-OFDM), unique word OFDM (UW-OFDM), resource block-filtered OFDM, filter bank multicarrier (FBMC), and the like. As shown in FIG. 1A, the communications system 100 ma