WO2023143908A1 - Procédés de radiomessagerie d'un dispositif sans fil pour reprendre une communication et dispositifs associés - Google Patents

Procédés de radiomessagerie d'un dispositif sans fil pour reprendre une communication et dispositifs associés Download PDF

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Publication number
WO2023143908A1
WO2023143908A1 PCT/EP2023/050496 EP2023050496W WO2023143908A1 WO 2023143908 A1 WO2023143908 A1 WO 2023143908A1 EP 2023050496 W EP2023050496 W EP 2023050496W WO 2023143908 A1 WO2023143908 A1 WO 2023143908A1
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WIPO (PCT)
Prior art keywords
wireless device
network node
paging
radio network
rna
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PCT/EP2023/050496
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English (en)
Inventor
Lars Nord
Torgny Palenius
Svante ALNÅS
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Sony Group Corporation
Sony Europe B.V.
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Publication of WO2023143908A1 publication Critical patent/WO2023143908A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/06—User notification, e.g. alerting and paging, for incoming communication, change of service or the like using multi-step notification by changing the notification area

Definitions

  • the present disclosure pertains to the field of wireless communications.
  • the present disclosure relates to methods for paging a wireless device to resume communication, a related first radio network node, a related core network node, a related second radio network node, and a related wireless device.
  • 3GPP 3rd Generation Partnership Project
  • UE User Equipment
  • RedCap Reduced Capability
  • 3GPP Rel-16 for 5G Cellular Internet of Things (CloT), it has been discussed how to handle long Extended Discontinuous Reception (eDRX), such as eDRX longer than 10.24s.
  • eDRX Extended Discontinuous Reception
  • 5G two states have been defined that a UE can enter to conserve energy: RRC-ldle state and RRC-lnactive state. Both states allow the UE to minimize the required UE activities on a radio interface of the UE.
  • the UE behavior in these two states is similar. However, when the UE resumes user plane traffic, the RRC-lnactive state can provide a more efficient transition between RRC- lnactive state and RRC-Connected State compared to the transition between RRC-ldle state and RRC-Connected state.
  • the network behavior however is fundamentally different.
  • the Core Network CN
  • RRC-lnactive state the Radio Access Network (RAN) is responsible of UE management including paging the UE, which is also known as RAN based paging.
  • CloT UEs In 3GPP Rel-16, it was decided that CloT UEs only are allowed to use eDRX shorter than 10.24s when in RRC-lnactive state. One reason being that CloT UEs are not expected to send user data over the User plane, instead use the Data over NAS feature (DoNAS). Thereby the CloT UE can transmit data while in Idle state.
  • DoNAS Data over NAS feature
  • RedCap UEs specified in Rel-17 use the User plane for user data and not DoNAS. Therefore, the discussion on combining RRC-lnactive with eDRX >10.24s become of interest again in 3GPP.
  • DL DownLink
  • the UE As specified today for RRC-lnactive, the UE is still in CN-Connected state which means that the data path between a User Plane Function (UPF) and the RAN is still active and all DL data and/or signaling will be forwarded directly to the RAN, as from a CN perspective the UE is ready to receive any DL information directly or with small delay (never more than 10.24s but typically around 1 ,28s).
  • UPF User Plane Function
  • the UE While the UE is in eDRX, the UE may move between radio access network notification areas (RNAs) that have no connectivity with each other.
  • RNAs radio access network notification areas
  • DL data may arrive and be buffered at a previous radio network node that holds a UE Context of the UE.
  • the UE When the UE wakes up from an eDRX cycle to receive paging, the UE may do reselection to another cell served by a radio network node that has no connectivity to the previous radio network node.
  • the DL data buffered at the previous radio network node can’t be forwarded to the UE, as an interface between the radio network nodes are missing, and may thus be lost, such as may never reach the UE.
  • a method is disclosed, performed by a first radio network node, for paging a wireless device to resume communication.
  • the wireless device is connected to a core network node.
  • the first radio network node serves a first radio access network notification area, RNA, associated with the wireless device.
  • the method comprises, upon failing to receive a paging response from the wireless device to a paging message comprising a radio access network temporary identifier assigned to the first RNA, sending, to the core network node, an instruction message instructing the core network node to transmit a paging request message to one or more radio network nodes outside the first RNA.
  • the instruction message comprising an indication to transmit a paging message to the wireless device outside the first RNA using a temporary identifier assigned to the wireless device.
  • a first radio network node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the first radio network node is configured to perform any of the methods disclosed herein and relating to the first radio network node.
  • the first radio network node can indicate to the core network node that it has not been able to page the WD.
  • the first radio network node instructing the core network node to escalate the paging to one or more radio network nodes outside the first RNA using a temporary identifier associated with the WD, the WD can be paged in a greater geographical area during a paging time window of the WD.
  • This escalation may include an indication that the first radio network node has pending DL data to be transmitted to the WD.
  • the core network node can further be made aware of the first radio network node having DL data to be transmitted to the WD. Hence, once the WD responds to a paging message from a radio network node outside the first RNA, the core network node may aid the radio network node outside the first RNA with retrieval of the UE context and/or the DL data for the WD from the first radio network node, even though there may be no connectivity between the first radio network node and the second radio network node.
  • the risk of DL data being lost due to mobility of the WD using a long eDRX can thus be reduced, since the core network can be made aware of the first radio network node having DL data to be transmitted to the WD but not being able to page the WD in the first RNA.
  • the CN node may instruct the one or more second radio network nodes outside the first RNA to page the WD outside the first RNA using the radio access network temporary identifier. This enables the WD to respond to the paging outside the first RNA by resuming the ongoing RRC Connection from the first RNA with one of the second radio network nodes outside the RNA. Thereby the signaling required to resume the communication with the WD may be reduced.
  • a method is disclosed, performed by a core network node, for handling paging of a wireless device to resume communication.
  • the wireless device is connected to the core network node.
  • the method comprises receiving, from a first radio network node, an instruction message instructing the core network node to transmit a paging request message to page the wireless device outside a first radio access network notification area, RNA, using a radio access network temporary identifier assigned to the wireless device by the first radio network node.
  • the method comprises sending, to second radio network nodes serving outside the first RNA, a paging request message comprising an indication indicating that the second radio network node is to send a paging message to the wireless device using the temporary identifier assigned to the wireless device.
  • a core network node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the core network node is configured to perform any of the methods disclosed herein and relating to the core network node.
  • the core network node can receive an indication from the first radio network node that the first radio network node has not been able to page the WD.
  • the core network node may further be instructed by the first radio network node to escalate the paging to one or more radio network nodes outside the first RNA using a temporary identifier associated with the WD.
  • the WD can be paged in a greater geographical area during a paging time window of the WD, such as during at least a part paging time window.
  • the core network node can further be made aware of the first WD having DL data to be transmitted to the WD.
  • the core network node may aid the radio network node outside the first RNA with retrieval of the UE context and/or the DL data for the WD from the first radio network node, even though there may be no direct connectivity (e.g. Xn interface) between the first radio network node and the second radio network node.
  • the risk of DL data being lost due to mobility of the WD using a long eDRX can thus be reduced, since the core network can be made aware of the first radio network node having DL data to be transmitted to the WD but not being able to page the WD in the first RNA.
  • the CN node may instruct the one or more second radio network nodes outside the first RNA to page the WD outside the first RNA using the radio access network temporary identifier.
  • This enables the WD to respond to the paging outside the first RNA by resuming the ongoing RRC Connection from the first RNA with one of the second radio network nodes outside the RNA. Thereby the signaling required to resume the communication with the WD may be reduced.
  • a method is disclosed, performed by a second radio network node, for handling paging of a wireless device to resume communication.
  • the wireless device is connected to a core network node and is associated to a first radio network node serving a first radio access network notification area, RNA, associated with the wireless device.
  • the second radio network node is outside the first RNA associated with the wireless device.
  • the method comprises receiving, from the core network node, a paging request message comprising an indication indicating that the second radio network node is to page the wireless device using a temporary identifier assigned to the wireless device.
  • a second radio network node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the second radio network node is configured to perform any of the methods disclosed herein and relating to the second radio network node.
  • the second radio network node can be instructed by the core network node to page the WD outside the first RNA using a temporary identifier associated with the WD.
  • the second radio network nodes can page the WD outside the first RNA using the radio access network temporary identifier associated to a previous connection in the first RNA. This enables the WD to respond to the paging outside the first RNA by resuming the ongoing RRC Connection from the first RNA with one of the second radio network nodes outside the RNA.
  • the core network node may aid the radio network node outside the first RNA with retrieval of the UE context and/or the DL data for the WD from the first radio network node, even though there may be no connectivity between the first radio network node and the second radio network node.
  • the risk of DL data being lost due to mobility of the WD using a long eDRX can thus be reduced, since the core network can be made aware of the first radio network node having DL data to be transmitted to the WD but not being able to page the WD in the first RNA.
  • a method is disclosed, performed by a wireless device, for handling paging of the wireless device to resume communication.
  • the wireless device is connected to a core network node and is associated to a first radio network node serving a first radio access network notification area, RNA, associated with the wireless device.
  • the method comprises, upon detecting that the wireless device is outside the first RNA, listening for paging messages comprising a temporary identifier assigned to the wireless device.
  • a wireless device comprising memory circuitry, processor circuitry, and a wireless interface, wherein the wireless device is configured to perform any of the methods disclosed herein and relating to the wireless device.
  • a loss of DL data for a WD can be prevented during mobility of the WD between RNAs.
  • the WD can be paged outside the first RNA using a temporary identifier associated with the WD.
  • the WD being paged outside the first RNA using a radio access network temporary identifier associated to a previous connection in the first RNA as the temporary identifier enables the WD to respond to the paging outside the first RNA by resuming the ongoing RRC Connection from the first RNA with one of the second radio network nodes outside the RNA.
  • the signaling required to resume the connection between the WD and the RAN may be reduced.
  • the DL data may be retrieved, with the aid of the CN, from the first radio network node and may be forwarded to the WD.
  • Fig. 1 is a diagram illustrating an example wireless communication system comprising an example network node and an example wireless device according to this disclosure
  • Fig. 2A is a signaling diagram illustrating an example message exchange according to this disclosure when a retrieval of a UE context for a WD within a radio access network succeeds
  • Fig. 2B is a signaling diagram illustrating an example message exchange according to this disclosure when a retrieval of a UE context for a WD within a radio access network fails
  • Fig. 3 is a flow-chart illustrating an example method, performed in a first radio network node of a wireless communication system, for paging a wireless device to resume communication according to this disclosure
  • Fig. 4 is a flow-chart illustrating an example method, performed in a core network node of a wireless communication system, for handling paging of a wireless device to resume communication according to this disclosure
  • Fig. 5 is a flow-chart illustrating an example method, performed in a second radio network node of a wireless communication system, for handling paging of a wireless device to resume communication according to this disclosure
  • Fig. 6 is a flow-chart illustrating an example method, performed in a wireless device, for handling paging of the wireless device to resume communication according to this disclosure
  • Fig. 7 is a block diagram illustrating an example first radio network node according to this disclosure.
  • Fig. 8 is a block diagram illustrating an example core network node according to this disclosure.
  • Fig. 9 is a block diagram illustrating an example second radio network node according to this disclosure.
  • Fig. 10 is a block diagram illustrating an example wireless device according to this disclosure.
  • a connected mode may be referred to as an operation mode wherein a data transmission can be communicated, for example, between the wireless device and a network node or between the wireless device and another wireless device.
  • a connected mode may be referred to as an operation state wherein a radio transmitter and/or a radio receiver is activated for such communication.
  • a connected mode may be referred to as an operation state wherein the wireless device is synchronized time-wise and/or frequency-wise for example by a determined timing advance parameter for the communication.
  • a connected mode may be referred to as a radio resource control (RRC) state.
  • RRC radio resource control
  • an active state may be a RRC connected state and/or an RRC active state.
  • a connected mode may be an active period within another RRC state.
  • the dormant mode can be a mode where the UE has no active connection with the network node.
  • a dormant mode may be seen as an inactive mode of the wireless device.
  • a dormant mode may be seen as a mode where the wireless device is unsynchronized with a timing of a network. In one or many examples the wireless device may in a dormant mode not have a valid timing advance information with respect to the network.
  • a dormant mode may be seen as a mode where the wireless device is unable to receive dedicated signaling.
  • a dormant mode may be seen as a mode where closed loop power control is inactivated or suspended.
  • Dormant mode may comprise an RRC idle state and/or RRC inactive state.
  • the wireless device may be in dormant mode when the connection with the network node has been released and/or suspended, or when a transceiver of the wireless device is turned off.
  • Fig. 1 is a diagram illustrating an example wireless communication system 1 comprising an example first network node 400 and an example wireless device 300 according to this disclosure.
  • the wireless communication system 1 comprises a wireless device 300, a first radio network node 400, a second radio network node 400A, and/or one or more core network node(s) 600.
  • a radio network node disclosed herein refers to a radio access network node operating in the radio access network, such as a base station, such as an evolved Node B, eNB, gNB in 5G system.
  • the RAN node is a functional unit which may be distributed in several physical units.
  • a core network, CN, node disclosed herein refers to a network node operating in the core network, such as in the Evolved Packet Core Network, EPC, and/or a 5G Core Network, 5GC.
  • EPC Evolved Packet Core Network
  • 5GC 5G Core Network
  • CN nodes in EPC and 5GC include but are not limited to a Mobility Management Entity (MME), an Access and Mobility Management Function (AMF), a Session Management Function (SMF) and or a User Plane Function (UPF).
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • UPF User Plane Function
  • the CN node is a functional unit which may be distributed in several physical units.
  • the wireless communication system 1 described herein may comprise one or more wireless devices 300, 300A, and/or one or more radio network nodes 400, 400A such as one or more of: a base station, an eNB, a gNB and/or an access point.
  • a wireless device may refer to a mobile device and/or a user equipment, UE.
  • the wireless device 300, 300A may be configured to communicate with the first radio network node and/or the second radio network node 400 via a wireless link (or radio access link) 10, 10A.
  • the first radio network node may be configured to communicate with the CN node 600 via a wired or wireless link 12.
  • the second radio network node may be configured to communicate with the CN node 600 via a wired or wireless link 12A.
  • the first radio network node 400 may be serving the WD 300 in a RAN notification area (RNA) 14 associated with the WD.
  • the RNA 14 may comprise one or more radio network nodes.
  • the WD When the WD is in the RRC-lnactive state, air interface resources with the WD are released but the WD’s context, such as the UE context, remains on the last serving radio network node, in this case the first radio network node 400.
  • the last serving radio network node receives DL data from a User Plane function (UPF) in the core network, or signaling from the core network node, such as from the AMF, the last serving radio network node may page the WD and may trigger paging in the cells corresponding to the RNA 14. This may include sending the paging to neighbor radio network nodes, which belong to the RNA 14, across for example an interface between two radio network nodes, such as an Xn interface,.
  • UPF User Plane function
  • the WD may move during the RRC-lnactive state and may thus no longer be available in the RNA associated with the WD when the paging is sent in the RNA 14.
  • the WD may have moved from the RNA 14 towards the second radio network node 400A and may no longer hear signaling from the first RNA 14.
  • the WD may perform an RNA update procedure if it moves to a cell which is not part of the current RNA assigned to the WD, such as to a cell served by the second radio network node 400A. Since the first radio network node may no longer be able to reach the WD 300, such as may not receive a response to the paging, the DL data received by the first radio network node may be lost in the first radio network node.
  • eDRX Enhanced Data Rate Extensions
  • the WD 300 may remain in RRC-lnactive state for longer times and may thus move further during the RRC-lnactive state than a WD applying a shorter eDRX.
  • a long eDRX may herein be an eDRX being longer than 10.24s, such as up to one or more hours
  • a short eDRX may herein be an eDRX being equal to or shorter than 10.24s.
  • the eDRX enables WDs to reduce power consumption by extending the period of time they remain asleep, such as the period of time in which the WD is in a dormant mode and is unable to receive dedicated signaling.
  • eDRX referred to herein corresponds to eDRX as specified in 3GPP TS 23.501 , v17.3.0.
  • the current disclosure addresses aspects related to RAN based paging combined with long eDRX and a paging time window (PTW) for paging the WD.
  • the PTW defines a time duration during which the WD can be paged in PCs.
  • the PTW may have a predefined first duration, such as in the range of 1-30s, such as 1-20s.
  • the PTW may monitor paging occasions.
  • the PTW may be periodic, such that the PTW repeats after a predetermined second time duration.
  • the predetermined second time duration may be the eDRX duration.
  • a long eDRX may herein be seen as an eDRX being longer than 10.24s.
  • the PTW may be a PTW as specified in 3GPP TS 23.501 ver. 17.3.0, clause 5.31.7.2.
  • the PTW allows the CN or the first radio network node to repeat paging in greater and greater geographical areas within one, such as a single, eDRX cycle.
  • the WD may monitor a sequence of POs, such as a sequence comprising a plurality of POs, such as 4 POs in sequence, before going back to sleep, such as entering dormant mode, and thus not being reachable by the network.
  • PO paging occasion
  • the RAN shall initiate an Access Network (AN) release.
  • the paging failure may be due to a first radio network node (such as an anchor node, such as a radio network node that holds a UE context of the WD) receiving DL data prior to the eDRX cycle expires or prior to the next PTW and the WD having moved outside the RNA before the WD wakes up from the eDRX cycle and detects that it is outside the RNA and can inform the network of the new location by performing an RNA update procedure (such as according to 3GPP TS 38.300 v16.7.0, clause 9.2.2.1).
  • the WD 300 may have initiated an RNA mobility update to the second radio network node 400A, for example due to moving out of the first RNA 14.
  • the second radio network node 400A may try to retrieve the UE context for the WD 300 from the old radio network node, such as from the first radio network node 400.
  • the first radio network node 400 may inform the second radio network node 400A that DL data for the WD 300 is pending in the first radio network node 400.
  • the first radio network node 400 may forward the UE context and the DL data to the second radio network node 400A via Xn interface and a control protocol used between radio network nodes, such as an Xn Application Protocol (XnAP).
  • XnAP Xn Application Protocol
  • the second radio network node 400A may send the DL data to the WD over a Uu interface.
  • the second radio network node 400A may initiate a path switch, such as an N2 interface path switch procedure, with a core network node 600, such as with an AMF and/or an SMF, to move an N3 interface tunnel to the second radio network node 400A.
  • a path switch such as an N2 interface path switch procedure
  • a core network node 600 such as with an AMF and/or an SMF
  • Fig. 2A is a signaling diagram illustrating an example message exchange between the first radio network node 400, the second radio network node 400A, the core network node 600, a UPF 800 and the WD 300 for paging the WD 300 to resume communication according to one or more example methods disclosed herein.
  • the WD 300 may be configured to use eDRX with long eDRX cycle and may be configured with a PTW.
  • the first radio network node 400 may receive DL data 1001 from the core network node 600, such as via the UPF.
  • the first radio network node 400 may be aware of, such as may have information indicating, that the WD is using eDRX with long eDRX cycle and that the WD is configured with the PTW.
  • the first radio network node may be responsible of the paging strategy within the first RNA.
  • the first radio network node may have received the information indicating that the WD is using eDRX with long eDRX cycle and is configured with the PTW from the CN node, in case the WD has been configured by the CN during a registration procedure.
  • the first radio network node may have received the information indicating that the WD is using eDRX with long eDRX cycle and is configured with the PTW because it has itself configured the WD with the eDRX and the PTW.
  • the first radio network node 400 may page 1005 the WD 300, such as sends a paging message, within the first RNA.
  • the paging message may be broadcasted in the first RNA and may not reach the WD 300, for example due to the WD 300 no longer being in the RNA, as indicated by the arrow in Fig. 2A not reaching all the way to the WD 300.
  • the first network node 400 may page the WD 300 using a RAN temporary identifier, such as an l-RNTI, assigned to the WD 300 in the first RNA.
  • the first radio network node 400 may page the WD in a subset of the POs comprised in the PTW of the WD.
  • a subset of the POs herein means that not all the POs in the PTW are used by the first radio network node.
  • the first radio network node may for example use the first 1-2 POs within the PTW to page the WD in the first RNA.
  • the first radio network node 400 may send an instruction message 1006 to the CN node 600 to escalate the paging of the WD in a wider area (such as outside the first RNA).
  • the instruction message may instruct the core network node 600 to transmit a paging request message to one or more radio network nodes outside the first RNA.
  • the instruction message 1006 may be a paging escalation request.
  • the instruction message may request the core network node 600 to instruct the one or more network nodes outside the RNA to page the WD 300 using the same RAN temporary identifier as used for paging in the first RNA.
  • the instruction message may be transmitted, such as over an N2 interface and may thus be an N2 message.
  • the instruction message may comprise an indicator indicating a number of remaining POs in the PTW configured for the WD 300.
  • the instruction message may comprise a temporary identifier associated with the WD.
  • the temporary identifier may be a temporary RAN identifier assigned to the WD, such as the l-RNTI assigned to WD in the first RNA, or a CN temporary identifier, such as a 5G-TMSI or a 5G-S-TMSL
  • the instruction message may comprise a UE RAN context of the WD 300.
  • the instruction message may comprise DL data for the WD 300.
  • the CN node 600 may send a paging request message 1007 to one or more second RAN nodes 400A outside the first RNA.
  • the paging request message may comprise the temporary identifier to be used by the one or more second radio network nodes 400, such as the temporary RAN identifier and/or the temporary CN identifier.
  • the paging request message may further comprise an indication indicating a number of remaining POs for paging the WD 300 in the PTW or how many times the paging should be repeated by the second radio network node 400.
  • the WD 300 may wake up from the eDRX cycle 1002, such as from an RRC Inactive State. In case the WD 300 has moved during the eDRX cycle, the WD 300 may detect 1003 that it is outside the first RNA. Upon the WD 300 detecting 1003 that it is outside the first RNA, the WD 300 may initiate an RNA mobility update (RNAU) with a second radio network node 400A outside the first RNA. The RNAU may be initiated using the RAN temporary identifier associated with the WD 300 in the first RNA, such as the l-RNTI and/or a core network temporary identifier associated with the WD 300.
  • RNAU RNA mobility update
  • the WD 300 may initiate the RNAU by sending an RNA mobility update message 1004 to the second radio network node 400A.
  • the RNA mobility update message 1004 may comprise the RAN temporary identifier associated with the WD 300 in the first RNA and/or a core network temporary identifier.
  • the first radio network node 400 receiving DL data and paging the WD 300 may occur independently from the WD 300 waking up from the eDRX cycle. Hence, the WD 300 waking up from the eDRX cycle may occur prior to, simultaneously with and/or after to the first radio network node 400 receiving DL data and paging the WD 300.
  • the one or more second radio network nodes 400A outside the first RNA may page 1008 the WD 300, such as may send a paging message to the WD 300, outside the first RNA using the temporary identifier assigned to the wireless device, such as the RAN temporary identifier and/or the CN temporary identifier.
  • the CN temporary identifier may be one or more of a 5G-Temporary Mobile Subscriber Identity (5G-TMSI), a 5G-S-Temporary Mobile Subscriber Identity (5G-S-TMSI) and a Globally Unique AMF Identifier (GUAMI).
  • the one or more second radio network nodes 400A may start with paging the WD 300 using the RAN temporary identifier, such as the l-RNTL Paging the WD 300 with the RAN temporary identifier has the benefit that the WD 300 may resume its RRC Connection with the second radio network node 400A as a response to the paging message.
  • the one or more second radio network nodes 400A may page the WD 300 in one or more of the remaining POs comprised in the PTW of the WD 300, such as in one or more of the POs comprised in the PTW that have not been used by the first radio network node 400 prior to sending the instruction message 1006.
  • the second radio network node may start the paging of the WD 300 at the first paging occasion and/or first remaining paging occasion within the PTW indicated in the paging request message received from the core network node.
  • the CN node may provide parameters to the second radio network node so that the second radio network node can calculate the next PO and/or how many times the second radio network node is to page the WD.
  • the WD 300 Upon receiving the paging message from one of the one or more second radio network nodes 400A, the WD 300 can send a paging response 1009 to the second radio network node 400A.
  • the WD 300 may respond by trying to resume the RRC-Connection from RRC-lnactive, such as by sending a resume request to the second radio network node 400A using the temporary RAN identifier.
  • the second radio network node 400A may try to retrieve a UE context of the WD 300 directly from the first radio network node 400 by sending a retrieve UE context request message 1010 comprising the RAN temporary identifier to the first radio network node 400.
  • the second radio network node may set up a path for forwarding DL data for the WD 300 from the first radio network node 400 to the second radio network node 400A.
  • the path for forwarding the DL data for the WD 300 may be set up by the second radio network node sending a message comprising an Xn-U address 1011 to the first radio network node 400.
  • the second network node may send the retrieve UE context request message 1010 in response to receiving the paging response message 1009 from the WD 300 or in response to receiving the RNA mobility update message 1004 from the WD 300.
  • the second radio network node 400A may retrieve the UE context 1012 and/or the DL data 1013 for the from the first radio network node.
  • the UE context 1012 and/or the DL data 1013 may be retrieved from the first radio network node using the XnAP (as defined in 3GPP TS 38.423 v16.7.0, clause 8.2.4.2).
  • An Xn User plane (Xn-U) interface may be configured to forward any pending data, such as data buffered by the first radio network node 400, from the first radio network node 400 to the second radio network node 400A.
  • a reception of DL data from the first radio network node 400 at the second radio network node 400A may, if the WD 300 has not been released from an RRC Connected state, trigger the second radio network node 400A to deliver, such as to send, the DL data 1014 to the WD 300.
  • the second radio network node 400A may follow legacy procedures before releasing 1015 the WD 300 from the RRC Connected state, such as to an RRC Idle state or an RRC Inactive state.
  • the legacy procedures before releasing the 300 from the RRC Connected state may comprise the second radio network node 400A sending a path switch request 1016 to the core network node 600.
  • the path switch request may be sent by the second radio network node to request the core network node to configure user plane resources for a tunnel to the second radio network node via an N3 interface, such as an N3 tunnel.
  • the path switch request may request the core network node to switch a termination point of the N3 tunnel from the first radio network node 400 to the second radio network node 400A.
  • the legacy procedures before releasing the 300 from the RRC Connected state may comprise he core network node 600 sending a session modification request 1017 to the UPF, requesting the UPF to modify a user plane, such modifying the PDU session(s) configuration comprising for example Forwarding data rules (FDR) and the Tunnel Endpoint ID (TEID) of the second radio network node, to move a tunnel on the N3 interface, for the WD 300 from the first radio network node 400 to the second radio network node 400A.
  • FDR Forwarding data rules
  • TEID Tunnel Endpoint ID
  • the legacy procedures before releasing the 300 from the RRC Connected state may comprise the UPF 800 modifying the user plane and may respond to the session modification request with a session modification response 1018 to the core network node 600.
  • the legacy procedures before releasing the 300 from the RRC Connected state may comprise, , the core network node sending a path switch response 1019, such as a path switch request acknowledge (ACK), to the second radio network node 400A upon receiving the session modification response.
  • the path switch response 1019 may indicate to the second radio network node that a user plane path switch has been successfully completed in the core network.
  • the legacy procedures before releasing the 300 from the RRC Connected state may comprise, the second radio network node sending a RRC Release with suspend message 1020 to the WD 300.
  • the WD 300 may store the UE AS context and any configuration received from the network, and may transit to RRC- Inactive state.
  • Fig. 2B is a signaling diagram illustrating an example message exchange between the first radio network node 400, the second radio network node 400A, the core network node 600, and the WD 300 for paging the WD 300 to resume communication according to one or more example methods disclosed herein.
  • the WD 300 may be configured to use eDRX with long eDRX cycle and may be configured with a PTW.
  • the message exchange in Fig. 2B can be similar to the message exchange in Fig. 2A but differs in that the RAN fails in resolving the retrieve UE context request 1010.
  • the second radio network node 400A fails 1012A to retrieve the UE context of the WD 300 directly from the first radio network node 400 in response to sending the UE context retrieve request 1010.
  • the second radio network node 400A may reject the RNAU from the WD 300 and may send an RNAU reject message 1012B to the WD 300.
  • the WD 300 may move to RRC-ldle state, but may keep the context, such as an access network (AS) content, from the first radio network node for a time period to accommodate for paging using the RAN temporary identifier assigned by the first radio network node).
  • the WD 300 may perform a NAS recovery procedure with the core network node 600, such as with the AMF.
  • the NAS recovery procedure may be performed using the CN temporary identifier associated with the WD, such as using the 5G-S-TMSI.
  • Using the CN temporary identifier allows the DL data to be retrieved and delivered to the WD, even though the UE context of the WD cannot be recovered and/or reused from the first radio network node. Thereby a loss of data may be prevented.
  • the AMF may have received a paging escalation request, such as the instruction message 1006 to escalate the paging of the WD, from the first radio network node.
  • the core network node 600 may then assist the second radio network node in retrieving the UE context and/or the DL data by informing the first radio network node, in case the UE context and/or the DL data was not received by the core network node from the first radio network node together with the instruction message 1006 to escalate the paging of the WD.
  • the DL data may be forwarded from the first radio network node 400 to the second radio network node via one or more UPF(s) (first radio network node -> UPF -> second radio network node).
  • the core network node 600 can forward the UE context 1012E and/or the DL data 1012F to the second radio network node.
  • the second network node 400A may then continue with the message exchange in accordance with Fig. 2A by sending, the DL data 1014 to the WD 300.
  • Fig. 3 shows a flow diagram of an example method 100, performed by a first radio network node according to the disclosure, for paging a WD to resume communication.
  • the first radio network node is a network node disclosed herein, such as the network node 400 of Fig. 1 , Fig. 2A, Fig. 2B, and Fig. 7.
  • the wireless device is connected to a core network node.
  • the first radio network node serves a first RNA associated with the WD.
  • the RNA associated to the WD comprises a set of cells or radio network nodes where a serving radio network node or cells served by the serving radio network node is comprised in the set.
  • the serving radio network node herein is a radio network node currently having a UE context with the WD.
  • the WD has no active radio connection to the first radio network node. In other words, the WD may be in RRC Inactive state towards the first radio network node.
  • the first radio network node may be the serving radio network node for the WD in the first RNA.
  • the first radio network node may be responsible of the paging strategy for the WD within the first RNA.
  • the first radio network node may be aware of the WD using eDRX with a long eDRX cycle.
  • the first radio network node may further be aware of a paging time window configured for the WD.
  • the first radio network node is responsible of the paging strategy within the first RNA.
  • the WD may be configured with a paging time window.
  • the paging time window may be a paging time window as specified in 3GPP TS 23.501 v17.3.0 clause 5.31 .7.2.
  • the paging time window allows the first radio network node to page the WD in a cell handled by the first radio network node, escalating the paging to the entire RNA and also request the core network to repeat the paging in a greater and greater area within one single eDRX cycle.
  • the WD wakes up to monitor POs, it may monitor a sequence of POs, such as 4 POs in sequence, before going back to RRC Inactive state (and thus not being reachable).
  • the first radio network node may have, such as may have received from the core network node, downlink data to be transmitted to the WD.
  • the first radio network node may buffer the DL data until the paging time window of the WD starts.
  • the method comprises paging S101 the WD in the first RNA using a paging message to the WD in the first RNA a temporary identifier (ID) associated with the WD, such as a radio access network temporary ID, such as an Inactive Radio Network Temporary Identifier (l-RNTI) assigned to the first RNA.
  • ID a temporary identifier associated with the WD
  • l-RNTI Inactive Radio Network Temporary Identifier assigned to the first RNA.
  • Paging herein means broadcasting a paging message to the WD in the first RNA.
  • the paging message may comprise the temporary identifier (ID) associated with the WD, such as a radio access network temporary ID, such as the l-RNTI assigned to the first RNA.
  • the first radio network node may page the WD within the first RNA not using all the POs in the paging time window, such as using a subset of the POs in the paging time window.
  • the method 100 comprises, upon receiving a paging response S101 A from the WD, sending S102 the DL data, such as the buffered DL data, to the WD.
  • the method 100 comprises, upon failing to receive a paging response S101 B from the wireless device to a paging message comprising a radio access network temporary ID assigned to the first RNA, sending S103, to the core network node, an instruction message instructing the core network node to transmit a paging request message, such as a paging escalation request message, to one or more radio network nodes outside the first RNA comprising an indication to transmit, such as an instruction to transmit, a paging message to the WD outside the first RNA using a temporary identifier assigned to the WD.
  • the temporary identifier assigned to the WD may be comprised in the instruction message instructing the core network node to transmit a paging request message.
  • the CN node may thus receive the temporary identifier from the first radio network node in the instruction message and may forward the temporary identifier to the one or more radio network nodes in for example a paging request message.
  • the first radio network node may escalate the paging to the CN to page the WD in a wider geographical area, such as outside the first RNA such as in a Registration Area (RA) of the WD.
  • the RA may be an area that the CN normally pages the WD in.
  • Radio network nodes outside the first RNA herein means radio network nodes not comprised in the first RNA.
  • Radio network nodes outside the first RNA herein means radio network nodes not comprised in the first RNA.
  • the instruction message comprises information indicating that the paging message outside the first RNA is to be transmitted within a paging time window used for paging the WD in the first RNA.
  • the instruction message herein may be, or may be seen as, a network assistance message, an instruction message, and/or a request message.
  • the instruction message comprises information indicative of a remaining time of the paging time window.
  • the information indicative of the remaining time of the paging time window is indicative of a remaining number of paging occasions within the paging time window.
  • the remaining number of paging occasions herein means the number of paging occasions comprised in the paging time window that have not been used by the first radio network node to page the WD in the first radio network node.
  • the temporary identifier assigned to the wireless device is a RAN temporary identifier, such as an Inactive Radio Network Temporary Identifier (I- RNTI) assigned to the first RNA.
  • I- RNTI Inactive Radio Network Temporary Identifier
  • the RAN temporary identifier may be assigned to the WD when the WD enters inactive state, such as RRC Inactive state in the first RNA.
  • the first radio network node may thus instruct the core network node to transmit a paging request message to one or more radio network nodes outside the first RNA comprising an indication to transmit a paging message to the WD outside the first RNA using, such as reusing, the RAN temporary identifier, such as the l-RNTI assigned to the first RNA.
  • the CN node may be instructed to request the one or more second radio network nodes to page the WD using the RAN temporary identifier.
  • the WD can respond to the paging by resuming an ongoing RRC Connection from the RNA with the second radio network node outside the RNA. This can reduce the signaling required between the WD and the network to resume the communication with the WD. Reducing the signaling required between the WD and the network also reduces the time it takes to resume the communication with the WD.
  • the temporary identifier assigned to the wireless device is a CN temporary identifier, such as a 5G-S-TMSI, a 5G-TMSI and/or a GUAMI.
  • the paging may be CN initiated.
  • CN initiated paging can be used to recover from RAN based paging failure.
  • Sending the CN temporary identifier may trigger signaling between the WD and the core network to create a new UE context in RAN as the WD assumes the RAN lost the UE context with the WD as the WD has been paged by the CN even though the WD believed it was still in RRC Inactive towards the RAN.
  • Using the CN temporary identifier allows the DL data to be retrieved and delivered to the WD, even though the UE context of the WD cannot be recovered and/or reused from the first radio network node. Thereby a loss of data may be prevented.
  • the instruction message comprises one or more of a UE context and DL data for the wireless device.
  • the first radio network node may send the UE context and/or the DL data for the WD to the core network node in the instruction message, to be forwarded to a second radio network node upon the WD connecting to the second radio network node.
  • the instruction message instructs the core network node to maintain the connection with the wireless device.
  • the instruction message is sent to the core network node via a control plane interface.
  • the control plane interface N2 may use the NG Application Protocol (NGAP) between the radio network node and the core network node as specified in 3GPP TS 38.413.
  • NGAP NG Application Protocol
  • the method comprises providing S105, to a second radio network node outside the first RNA, one or more of a UE context and DL data for the wireless device.
  • providing S105 comprises receiving S105A a request, from a second radio network node outside the first RNA, to forward one or more of the UE context for the WD and the DL data for the WD.
  • the request received by the first radio network node may be comprised in, such as may be part of, an RNA mobility procedure performed by the WD.
  • the request from the second radio network node outside the first RNA is a retrieve UE context request
  • providing S105 comprises transmitting S105B one or more of the UE context and DL data for the wireless device directly to the second radio network node outside the first RNA.
  • the first radio network node may transmit one or more of the UE context and the DL data in response to receiving S105A the request from the second radio network node outside the first RNA.
  • the first radio network node may transmit the UE context and/or the DL data to the second radio network node via an Xn Application Protocol (XnAP).
  • XnAP Xn Application Protocol
  • the first radio network node may transmit one or more of the UE context and the DL data via the core network node in response to receiving a message from the CN node informing about the paging result. If the paging result was successful, the first network node may transmit one or more of the UE context and the DL data to either the CN node and/or to the second radio network node.
  • providing S105 comprises transmitting S105C one or more of the UE context and DL data for the wireless device to the second radio network node outside the first RNA via the core network node.
  • the first radio network node may transmit one or more of the UE context and the DL data via the core network node in response to receiving S105A the request from the second radio network node outside the first RNA.
  • the one or more of the UE context and the DL data may be transmitted to the second radio network node via a UPF in the CN.
  • the first radio network node may transmit one or more of the UE context and the DL data via the core network node in response to receiving a message from the CN node informing about the paging result. If the paging result was successful, the first network node may transmit one or more of the UE context and the DL data to either the CN node and/or to the second radio network node.
  • the CN node may trigger a UE context release in the first radio network node.
  • Fig. 4 shows a flow diagram of an example method 200, performed by a core network node according to the disclosure, for paging a wireless device to resume communication.
  • the core network node is a core network node disclosed herein, such as core network node 600 of Fig. 1 , Fig. 2A, Fig. 2B, and Fig. 7.
  • the wireless device is connected to the core network node.
  • the method 200 comprises receiving S201 , from a first radio network node, an instruction message instructing the core network node to transmit a paging request message to page the wireless device outside a first RNA using a temporary identifier assigned to the wireless device.
  • the temporary identifier assigned to the wireless device may be comprised in the instruction message.
  • the instruction message comprises information indicating that the paging message, sent from radio network nodes outside the first RNA, is to be transmitted within a same paging time window for paging the wireless device as by the first radio network node in the first RNA.
  • the instruction message comprises information indicative of a remaining time of the paging time window.
  • the information indicative of the remaining time of the paging time window is indicative of a remaining number of paging occasions within the paging time window.
  • the remaining number of paging occasions herein means the number of paging occasions comprised in the paging time window that have not been used by the first radio network node to page the WD in the first radio network node.
  • the remaining number of paging occasions herein means the number of paging occasions comprised in the paging time window that are available to a second radio network node for paging the WD outside the first RNA.
  • the instruction message instructs the core network node to maintain the connection with the wireless device.
  • the instruction message may instruct the core network node to maintain the connection with the wireless device for a time period, such as until the core network node has tried to page the WD.
  • the core network node may release the WD from the core network.
  • the instruction message is received from the first radio network node via a control plane interface.
  • the control plane interface may be a N2 interface and use NG Application Protocol (NGAP) between the radio network node and the core network node as specified in 3GPP TS 38.413 over the N2 interface.
  • NGAP NG Application Protocol
  • the instruction message comprises one or more of a UE context and DL data for the WD.
  • step S201 performed by the core network node corresponds to step S103 performed by the first radio network node as discussed in relation to Fig. 3.
  • the method 200 comprises sending S203, to second radio network nodes, such as to one or more second radio network nodes, serving outside the first RNA, a paging request message comprising an indication indicating that the second radio network node is to send a paging message to the wireless device using the temporary identifier assigned to the wireless device.
  • the paging request message comprises information indicating that the paging message, sent from radio network nodes outside the first RNA, is to be transmitted within the same paging time window for paging the wireless device as by the first radio network node in the first RNA.
  • the paging request message comprises information indicative of a remaining time of the paging time window.
  • the information indicative of the remaining time of the paging time window is indicative of a remaining number of paging occasions within the paging time window.
  • the paging request message may comprise information, such as parameters, to the second radio network node allowing the second radio network node to calculate the next PO and/or how many times the second radio network node is to page the WD.
  • the remaining number of paging occasions are indicative of the number of paging occasions comprised in the paging time window that can be used by, such as are available to, the second radio network node for paging the WD.
  • the temporary identifier assigned to the wireless device is a RAN temporary identifier, such as the l-RNTI assigned to the first RNA.
  • the CN node may request the one or more second radio network nodes to page the WD using the RAN temporary identifier.
  • the WD can respond to the paging by resuming an ongoing RRC Connection from the RNA with the second radio network node outside the RNA. This can reduce the signaling required between the WD and the network to resume the communication with the WD. Reducing the signaling required between the WD and the network also reduces the time it takes to resume the communication with the WD.
  • the temporary identifier assigned to the wireless device is a CN temporary identifier, such as one or more of a 5G-S-TMSI, a 5G-TMSI and a GUAMI.
  • the paging may be CN initiated.
  • CN initiated paging can be used to recover from RAN based paging failure.
  • Sending the CN temporary identifier may trigger signaling between the WD and the core network to create a new UE context in the RAN as the WD assumes the RAN has lost the UE context with the WD as the WD has been paged by the CN.
  • Using the CN temporary identifier allows the DL data to be retrieved and delivered to the WD, even though the UE context of the WD cannot be recovered and/or reused from the first radio network node. Thereby a loss of data may be prevented.
  • the method comprises receiving S205, from one of the one or more second radio network nodes, a response message indicating that the wireless device has responded to paging, such as to paging from the second radio network node.
  • the response message triggers a move of a user plane function for the wireless device to the second radio network node.
  • the response message may in one or more example methods comprise a request to modify a user plane function for the WD, such as a path switch request.
  • the request to modify the user plane function may trigger the modify the configuration of the UPF.
  • the response message may be a path switch request message.
  • Modifying the configuration of the UPF may comprise reconfiguring and/or modifying the UPF so that a tunnel and other rules of the UPF are updated to support Internet Protocol (IP) connectivity between the second radio network node and the UPF instead of the first radio network node and the UPF.
  • IP Internet Protocol
  • the UPF may be modified to switch a user plane path for the wireless device to the second network node.
  • the response message triggers a forwarding of the UE context of the wireless device from the first wireless node and/or data to be communicated to the wireless device from the first wireless node.
  • the method comprises, in response to receiving the response message triggering a modifying of the user plane function, such as in response to receiving the request to modify the user plane function, moving S207 the user plane function for the wireless device from the first radio network node to the second radio network node.
  • the method comprises, in response to receiving the response message triggering a forwarding of the UE context of the wireless device and/or data to be communicated to the wireless device, forwarding S209 the UE context of the wireless device and/or the data to be communicated to the wireless device from the first radio network node to the second radio network node.
  • the core network node is an application management function (AMF).
  • Fig. 5 shows a flow diagram of an example method 500, performed by a second radio network node according to the disclosure, for paging a wireless device to resume communication.
  • the second radio network node is a network node disclosed herein, such as the network node 400A of Fig. 1 , Fig. 2A, Fig. 2B, and Fig. 9.
  • the wireless device is connected to a core network node and is associated to a first radio network node serving a first radio access network notification area, RNA, associated with the wireless device.
  • the second radio network node is outside the first RNA associated with the wireless device
  • the method 500 comprises receiving S501 , from the core network node, a paging request message comprising an indication indicating that the second radio network node is to page the wireless device using a temporary identifier assigned to the wireless device.
  • the temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier (l-RNTI) assigned to the first RNA.
  • the core network node may thus instruct the second radio network node to transmit a paging message to the WD outside the first RNA using, such as reusing, the l-RNTI assigned to the WD in the first RNA.
  • the temporary identifier assigned to the wireless device is the CN temporary identifier, such as one or more of a 5G-S-TMSI, a 5G-TMSI and a GUAMI.
  • the paging may be CN initiated. Paging the WD using the CN temporary identifier, such as paging the WD using the 5G-S-TMSI, 5G-TMSI and/or GUAMI, may trigger signaling between the WD and the core network to create a new UE context in the RAN, such as with the second radio network node.
  • Using the CN temporary identifier allows the DL data to be retrieved and delivered to the WD, even though the UE context of the WD cannot be recovered and/or reused from the first radio network node. Thereby a loss of data may be prevented.
  • the paging request message comprises information indicating that the wireless device is to be paged within a same paging time window for paging the wireless device as a paging message transmitted to the wireless device by the first radio network node in the first RNA.
  • the paging request message comprises information indicative of a remaining time of the paging time window.
  • the information indicative of the remaining time of the paging time window is indicative of a remaining number of paging occasions within the paging time window.
  • the paging request message may comprise information, such as parameters, to the second radio network node allowing the second radio network node to calculate the next PO and/or how many times the second radio network node is to page the WD.
  • the remaining number of paging occasions herein means the number of paging occasions comprised in the paging time window that have not been used by the first radio network node to page the WD in the first radio network node.
  • the remaining number of paging occasions herein means the number of paging occasions comprised in the paging time window that are available to a second radio network node for paging the WD outside the first RNA.
  • the method comprises paging S503 the WD, such as transmitting a paging message, outside the first RNA using the temporary identifier assigned to the WD.
  • the paging S503 may comprise paging S503A the WD using the RAN temporary identifier, such as the l-RNTL
  • the paging S503 may comprise, paging S503B the WD using the CN temporary identifier, such as the 5G-TMSI. Paging the WD using the CN temporary identifier may trigger signaling between the WD and the core network to create a new UE context with the second radio network node as the WD assumes that the RAN has lost the UE context with the WD.
  • the CN temporary identifier such as the 5G-TMSI.
  • the second radio network node may be instructed by the core network node which temporary identifier to use for paging the WD. This may for example be done by including the temporary identifier to be used in the paging request message sent to the second radio network node.
  • paging S503 is performed within the same paging time window for paging the WD as a paging message transmitted to the WD by the first radio network node in the first RNA.
  • the paging S503 may be started at the first remaining paging occasion within the paging time window indicated in the paging request message received from the core network node.
  • the method comprises transmitting S505, to the core network node, a response message indicating that the wireless device has responded to the paging.
  • the response message triggers a modifying of the UPF and/or a tunnel over an N3 interface, for the wireless device to the second network node.
  • the UPF may be modified to switch a user plane path for the wireless device to the second network node.
  • the response message may in one or more example methods comprise a request to modify the UPF for the WD, such as a path switch request.
  • the request to modify the UPF may trigger the modifying of the UPF.
  • the response message triggers a forwarding of the UE context of the wireless device from the first radio network node and/or data to be communicated to the wireless device from the first radio network node.
  • the response message may comprise a request the core network to aid the second radio network node in retrieving the UE context and/or the DL data.
  • the method comprises receiving S507 the UE context of the wireless device and/or data to be communicated to the wireless device from the first wireless node to the second wireless node.
  • receiving S507 comprises receiving S507A one or more of the UE context of the wireless device and the data to be communicated to the wireless device directly from the first radio network node.
  • the second radio network node may receive the UE context and/or the DL data from the first radio network node via Xn interface using the XnAP protocol.
  • receiving S507 comprises receiving S507B the one or more of the UE context of the wireless device and the data to be communicated to the wireless device from the first radio network node via the core network node.
  • the one or more of the UE context and the DL data may be received from the first radio network node via one or more UPF(s) in the CN.
  • Fig. 6 shows a flow diagram of an example method 700, performed by a wireless device according to the disclosure, for handling paging of the wireless device to resume communication.
  • the wireless device is a wireless device disclosed herein, such as wireless device 300 of Fig. 1 , Fig. 2A, Fig. 2B, and Fig. 10.
  • the wireless device is connected to a core network node and is associated to a first radio network node serving a first RNA associated with the WD.
  • the WD being connected to the core network herein means that the WD is in a Connection management (CM) Connected state where a data path between the UPF and the RAN is still active and all DL data and/or signaling to the WD will be forwarded directly to RAN, as from a CN perspective the WD is ready to receive any DL information.
  • CM Connection management
  • the WD When the WD is in the CM-CONNECTED state, the WD has a Non-Access Stratum (NAS) signaling connection with the core network node, such as with the AMF, over an N1 interface.
  • NAS Non-Access Stratum
  • the WD has no active radio connection to the first radio network node. In other words, the WD may be in RRC Inactive state towards the first radio network node.
  • the method comprises detecting S701 whether the wireless device is outside the first RNA.
  • the method 700 comprises, upon detecting S701 A that the wireless device is outside the first RNA, listening S703 for paging messages comprising a temporary identifier assigned to the wireless device.
  • the temporary identifier assigned to the wireless device is a RAN temporary identifier, such as the l-RNTI, assigned to the first RNA.
  • the temporary identifier assigned to the wireless device is a CN temporary identifier, such as the 5G-TMSI, assigned by the CN.
  • the CN temporary identifier may be assigned to the WD by the CN and may be valid within the whole registered area of the WD such as within the RA.
  • the listening S703 comprises listening S703A for paging messages comprising the temporary identifier assigned to the wireless for a predetermined time period.
  • the predetermined time period may be the PTW of the WD. In one or more example methods, the predetermined time period may be an active period of the eDRX.
  • the WD 300 may resume S705 the previous connection from RRC inactive with the second radio network node.
  • the RAN temporary identifier such as the l-RNTI associated with the first RNA
  • the WD 300 may establish S707 a new connection with the second radio network node.
  • Fig. 7 shows a block diagram of an example first radio network node 400 according to the disclosure.
  • the first radio network node 400 comprises memory circuitry 401 , processor circuitry 402, and an interface 403.
  • the interface 403 may be a wireless interface and/or a wired interface.
  • the first radio network node 400 may be configured to perform any of the methods disclosed in Fig. 3. In other words, the first radio network node 400 may be configured for paging a WD to resume communication.
  • the first radio network node 400 is configured to communicate with a WD, such as the WD disclosed herein, using a wireless communication system.
  • the wireless interface 403 is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: E-UTRA, LTE, New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, millimeter-wave communications, such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • a wireless communication system such as a 3GPP system, such as a 3GPP system supporting one or more of: E-UTRA, LTE, New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M
  • millimeter-wave communications such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • the first radio network node 400 is configured to send to the core network node, upon failing to receive a paging response from the wireless device to a paging message comprising a radio access network temporary ID assigned to the first RNA for example, via the wireless interface 403, an instruction message instructing the core network node to transmit a paging request message to one or more radio network nodes outside the first RNA comprising an indication to transmit a paging message to the wireless device outside the first RNA using a temporary identifier assigned to the wireless device.
  • Processor circuitry 402 is optionally configured to perform any of the operations disclosed in Fig. 3 (such as any one or more of S101 , S101A, S101B, S102, S102, S103, S105, S105A, S105B, S105C).
  • the operations of the first radio network node 400 may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (for example, memory circuitry 401) and are executed by processor circuitry 402).
  • the operations of the first radio network node 400 may be considered a method that the first radio network node 400 is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software.
  • Memory circuitry 401 may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device.
  • memory circuitry 401 may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 402.
  • Memory circuitry 401 may exchange data with processor circuitry 402 over a data bus. Control lines and an address bus between memory circuitry 401 and processor circuitry 402 also may be present (not shown in Fig. 7).
  • Memory circuitry 401 is considered a non-transitory computer readable medium.
  • Memory circuitry 401 may be configured to store information, such as information indicative of one or more of a PTW of the WD, remaining POs in the PTW, a UE context of the WD, and DL data to be transmitted to the WD, and one or more temporary identifiers associated with the WD, in a part of the memory.
  • Fig. 8 shows a block diagram of an example core network node 600 according to the disclosure.
  • the core network node 600 comprises memory circuitry 601 , processor circuitry 602, and an interface 303.
  • the core network node 600 may be configured to perform any of the methods disclosed in Fig. 4. In other words, the core network node 600 may be configured for handling paging of a wireless device to resume communication.
  • the core network node 600 is configured to receive from a first radio network node, such as via the interface 603, an instruction message instructing the core network node to transmit a paging request message to page the wireless device outside a first RNA using a temporary identifier assigned to the wireless device.
  • the core network node 600 is configured to send, such as via the interface 603, a paging request message to second radio network nodes serving outside the first RNA, the paging request message comprising an indication indicating that the second radio network node is to send a paging message to the wireless device using the temporary identifier assigned to the wireless device.
  • the interface 603 is configured for communications with radio network nodes operating in a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: E-UTRA, LTE, New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, millimeter-wave communications, such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • the core network node 600 is optionally configured to perform any of the operations disclosed in Fig. 4 (such as any one or more of S201 , S203, S205, S207, S209).
  • the operations of the core network node 600 may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non- transitory computer readable medium (for example, memory circuitry 601 ) and are executed by processor circuitry 602).
  • executable logic routines for example, lines of code, software programs, etc.
  • the operations of the core network node 600 may be considered a method that the core network node 600 is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software.
  • Memory circuitry 601 may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device.
  • memory circuitry 601 may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 602.
  • Memory circuitry 601 may exchange data with processor circuitry 602 over a data bus. Control lines and an address bus between memory circuitry 601 and processor circuitry 602 also may be present (not shown in Fig. 8).
  • Memory circuitry 601 is considered a non-transitory computer readable medium.
  • Memory circuitry 601 may be configured to store information, such as information indicative of one or more of a PTW of the WD, remaining POs in the PTW, a UE context of the WD, and DL data to be transmitted to the WD, and one or more temporary identifiers associated with the WD, in a part of the memory.
  • Fig. 9 shows a block diagram of an example second radio network node 400A according to the disclosure.
  • the second radio network node 400A comprises memory circuitry 401A, processor circuitry 402A, and an interface 403A.
  • the interface 403A may be a wired interface and/or a wireless interface.
  • the second radio network node 400A may be configured to perform any of the methods disclosed in Fig. 5. In other words, the second radio network node 400A may be configured for handling paging of a WD to resume communication.
  • the second radio network node 400A is configured to communicate with a WD, such as the WD disclosed herein, using a wireless communication system.
  • the second radio network node 400A is configured to communicate with a network node, such as a core network node or another radio network node via a wired interface.
  • the interface 403A is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: E-UTRA, LTE, New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, millimeter-wave communications, such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • a wireless communication system such as a 3GPP system, such as a 3GPP system supporting one or more of: E-UTRA, LTE, New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M
  • millimeter-wave communications such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • the second radio network node 400A is configured to receive, for example via the interface 403A, a paging request message from the core network node comprising an indication indicating that the second radio network node 400A is to page the wireless device using a temporary identifier assigned to the wireless device.
  • the second radio network node 400A is configured to page the wireless device, for example via the interface 403A, using the temporary identifier assigned to the wireless device.
  • Processor circuitry 402A is optionally configured to perform any of the operations disclosed in Fig. 5 (such as any one or more of S501 , S503, S503A, S503B, S505, S507, S507A, S507B).
  • the operations of the network node 400 may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (for example, memory circuitry 401 A) and are executed by processor circuitry 402A).
  • the operations of the second radio network node 400A may be considered a method that the second radio network node 400 is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software.
  • Memory circuitry 401 A may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device.
  • memory circuitry 401 A may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 402A.
  • Memory circuitry 401A may exchange data with processor circuitry 402A over a data bus. Control lines and an address bus between memory circuitry 401A and processor circuitry 402A also may be present (not shown in Fig. 9).
  • Memory circuitry 401 A is considered a non-transitory computer readable medium.
  • Memory circuitry 401A may be configured to store information, such as information indicative of one or more of a PTW of the WD, remaining POs in the PTW, a UE context of the WD, and DL data to be transmitted to the WD, and one or more temporary identifiers associated with the WD, in a part of the memory.
  • Fig. 10 shows a block diagram of an example wireless device 300 according to the disclosure.
  • the wireless device 300 comprises memory circuitry 301 , processor circuitry 302, and a wireless interface 303.
  • the wireless device 300 may be configured to perform any of the methods disclosed in Fig. 6. In other words, the wireless device 300 may be configured handling paging of the wireless device to resume communication.
  • the wireless device 300 may be configured to be connected to a core network node and to be associated to a first radio network node serving a first RNA associated with the wireless device.
  • the wireless device 300 is configured to communicate with a network node, such as the first radio network node and/or the second radio network node disclosed herein, using a wireless communication system.
  • the wireless device 300 is configured to, upon detecting that the wireless device is outside the first RNA, listening (such as via the wireless interface 303) for paging messages comprising a temporary identifier assigned to the wireless device.
  • the wireless interface 303 is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, millimeter-wave communications, such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • the wireless device 300 is optionally configured to perform any of the operations disclosed in Fig. 6 (such as any one or more of S701 , S703, S703A, S705, S707).
  • the operations of the wireless device 300 may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non- transitory computer readable medium (for example, memory circuitry 301 ) and are executed by processor circuitry 302).
  • executable logic routines for example, lines of code, software programs, etc.
  • the operations of the wireless device 300 may be considered a method that the wireless device 300 is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software.
  • Memory circuitry 301 may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device.
  • memory circuitry 301 may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 302.
  • Memory circuitry 301 may exchange data with processor circuitry 302 over a data bus. Control lines and an address bus between memory circuitry 301 and processor circuitry 302 also may be present (not shown in Fig. 10).
  • Memory circuitry 301 is considered a non-transitory computer readable medium.
  • Memory circuitry 301 may be configured to store information, such as information indicative of one or more of a PTW of the WD, remaining POs in the PTW, a UE context of the WD, and one or more temporary identifiers associated with the WD, in a part of the memory.
  • first radio network node first radio network node, core network node, second radio network node and wireless device
  • first radio network node first radio network node, core network node, second radio network node and wireless device
  • S101 paging
  • S103 sending
  • Item 2 The method according to Item 1 , wherein the instruction message comprises information indicating that the paging message outside the first RNA is to be transmitted within a paging time window used for paging the wireless device in the first RNA.
  • Item 3 The method according to Item 2, wherein the instruction message comprises information indicative of a remaining time of the paging time window.
  • Item 4 The method according to Item 3, wherein the information indicative of the remaining time of the paging time window is indicative of a remaining number of paging occasions within the paging time window.
  • Item 5 The method according to any one of the previous Items, wherein the temporary identifier assigned to the wireless device is one or more of a radio access network temporary identifier and a core network temporary identifier.
  • Item 6 The method according to Item 5, wherein the radio access network temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier, l-RNTI, assigned to the first RNA.
  • the radio access network temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier, l-RNTI, assigned to the first RNA.
  • Item 7 The method according to any one of the Items 5-6, wherein the core network temporary identifier assigned to the wireless device is a 5G-Temporary Mobile Subscriber Identity, 5G-TMSL
  • Item 8 The method according to any one of the previous Items, wherein the instruction message comprises one or more of a User Equipment, UE, context and DL data for the wireless device.
  • Item 9 The method according to any one of the previous Items, wherein the instruction message instructs the core network node to maintain the connection with the wireless device.
  • Item 10 The method according to any one of the previous Items, wherein the instruction message is sent to the core network node via a control plane interface.
  • Item 11 The method according to any one of the previous Items, wherein the method comprises: providing (S105), to a second radio network node outside the first RNA, one or more of a UE context and DL data for the wireless device.
  • Item 12 The method according to Item 11 , wherein providing (S105) comprises transmitting (S105A) the one or more of the UE context and DL data for the wireless device directly to the second radio network node outside the first RNA.
  • Item 13 The method according to Item 11 , wherein providing (S105) comprises transmitting (S105B) the one or more of the UE context and DL data for the wireless device to the second radio network node outside the first RNA via the core network.
  • Item 14 A method performed by a core network node, for handling paging of a wireless device to resume communication, wherein the wireless device is connected to the core network node, the method comprising: receiving (S201 ), from a first radio network node, an instruction message instructing the core network node to transmit a paging request message to page the wireless device using a temporary identifier assigned to the wireless device, and
  • a paging request message comprising an indication indicating that the second radio network node is to send a paging message to the wireless device using the temporary identifier assigned to the wireless device.
  • Item 15 The method according to Item 14, wherein the instruction message and/or the paging request message comprises information indicating that the paging message, sent from radio network nodes outside the first RNA, is to be transmitted within a same paging time window for paging the wireless device as by the first radio network node in the first RNA.
  • Item 16 The method according to Item 15, wherein the instruction message and/or the paging request message comprises information indicative of a remaining time of the paging time window.
  • Item 17 The method according to Item 16, wherein the information indicative of the remaining time of the paging time window is indicative of a remaining number of paging occasions within the paging time window.
  • Item 18 The method according to any one of the Items 14-17, wherein the temporary identifier assigned to the wireless device is one or more of a radio access network temporary identifier and a core network temporary identifier.
  • Item 19 The method according to Item 18, wherein the radio access network temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier, l-RNTI, assigned to the first RNA.
  • the radio access network temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier, l-RNTI, assigned to the first RNA.
  • Item 20 The method according to any one of the Items 18-19, wherein the core network temporary identifier assigned to the wireless device is a 5G-Temporary Mobile Subscriber Identity, 5G-TMSL
  • Item 21 The method according to any one of the Items 14 to 20, wherein the instruction message instructs the core network node to maintain the connection with the wireless device.
  • Item 22 The method according to any one of the Items 14 to 21 , wherein the instruction message is received from the first radio network node via a control plane interface.
  • Item 23 The method according to any one of the Items 14 to 22, wherein the instruction message and/or the paging request message comprises one or more of a User Equipment, UE, context and DL data for the wireless device.
  • Item 24 The method according to any one of the Items 14 to 22, wherein the method comprises: receiving (S205), from one of the one or more second radio network nodes, a response message indicating that the wireless device has responded to the paging.
  • Item 25 The method according to Item 24, wherein the response message triggers one or more of: a modifying of a user plane function to switch a user plane path for the wireless device to the second network node, and
  • Item 26 The method according to Item 25, wherein the method comprises: in response to receiving the request to modify the user plane function, modifying (S207) the user plane function to switch the user plane path for the wireless device to the second network node.
  • Item 27 The method according to Item 24 or 25, wherein the method comprises:
  • Item 28 The method according to any one of the Items 14 to 27, wherein the core network node is an application management function.
  • Item 29 A method performed by a second radio network node, for handling paging of a wireless device to resume communication, wherein the wireless device is connected to a core network node and is associated to a first radio network node serving a first radio access network notification area, RNA, associated with the wireless device, wherein the second radio network node is outside the first RNA associated with the wireless device, the method comprising: receiving (S501 ), from the core network node, a paging request message comprising an indication indicating that the second radio network node is to page the wireless device using a temporary identifier assigned to the wireless device, and paging (S503) the wireless device using the temporary identifier assigned to the wireless device.
  • Item 30 The method according to Item 29, wherein the paging request message comprises information indicating that the wireless device is to be paged within a same paging time window for paging the wireless device as a paging message transmitted to the wireless device by the first radio network node in the first RNA.
  • Item 31 The method according to Item 30, wherein the paging request message comprises information indicative of a remaining time of the paging time window.
  • Item 32 The method according to Item 31 , wherein the information indicative of the remaining time of the paging time window is indicative of a remaining number of paging occasions within the paging time window.
  • Item 33 The method according to any one of the Items 29-32, wherein the temporary identifier assigned to the wireless device is one or more of a radio access network temporary identifier and a core network temporary identifier.
  • Item 34 The method according to Item 33, wherein the radio access network temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier, l-RNTI, assigned to the first RNA.
  • the radio access network temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier, l-RNTI, assigned to the first RNA.
  • Item 35 The method according to any one of the Items 33-34, wherein the core network temporary identifier assigned to the wireless device is a 5G-Temporary Mobile Subscriber Identity, 5G-TMSL
  • Item 36 The method according to any one of the Items 29 to 35, wherein the method comprises:
  • Item 37 The method according to Item 36, wherein the response message triggering one or more of:
  • Item 38 The method according to Item 36 or 37, wherein the method comprises: receiving (S507) the UE context of the wireless device and/or data to be communicated to the wireless device from the first wireless node to the second wireless node.
  • receiving (S507) comprises receiving (S507A) the one or more of the UE context of the wireless device and the data to be communicated to the wireless device directly from the first radio network node.
  • receiving (S507) comprises receiving (S507B) the one or more of the UE context of the wireless device and the data to be communicated to the wireless device from the first radio network node via the core network node.
  • Item 41 A method performed by a wireless device, for handling paging of the wireless device to resume communication, wherein the wireless device is connected to a core network node and is associated to a first radio network node serving a first radio access network notification area, RNA, associated with the wireless device, the method comprising: upon detecting (S701) that the wireless device is outside the first RNA, listening (S703) for paging messages comprising a temporary identifier assigned to the wireless device.
  • Item 42 The method according to Item 41 , wherein the listening (S703) comprises listening (S703A) for paging messages comprising the temporary identifier assigned to the wireless device in the first RNA for a predetermined time period.
  • Item 43 The method according to any one of the Items 41-42, wherein the temporary identifier assigned to the wireless device is a radio access network temporary identifier.
  • Item 44 The method according to Item 44, wherein the radio access network temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier, l-RNTI, assigned to the first RNA.
  • the radio access network temporary identifier assigned to the wireless device is an Inactive Radio Network Temporary Identifier, l-RNTI, assigned to the first RNA.
  • a first radio network node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the first radio network node is configured to perform any of the methods according to any of Items 1-13.
  • Item 46 A core network node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the core network node is configured to perform any of the methods according to any of Items 14-28.
  • Item 47 A second radio network node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the second radio network node is configured to perform any of the methods according to any of Items 29-40.
  • Item 48. A wireless device comprising memory circuitry, processor circuitry, and a wireless interface, wherein the wireless device is configured to perform any of the methods according to any of Items 41-44.
  • first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not imply any particular order, but are included to identify individual elements.
  • the use of the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not denote any order or importance, but rather the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used to distinguish one element from another.
  • the words “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used here and elsewhere for labelling purposes only and are not intended to denote any specific spatial or temporal ordering.
  • the labelling of a first element does not imply the presence of a second element and vice versa.
  • Figures 1-10 comprise some circuitries or operations which are illustrated with a solid line and some circuitries, components, features, or operations which are illustrated with a dashed line.
  • Circuitries or operations which are comprised in a solid line are circuitries, components, features or operations which are comprised in the broadest example.
  • Circuitries, components, features, or operations which are comprised in a dashed line are examples which may be comprised in, or a part of, or are further circuitries, components, features, or operations which may be taken in addition to circuitries, components, features, or operations of the solid line examples. It should be appreciated that these operations need not be performed in order presented. Furthermore, it should be appreciated that not all of the operations need to be performed. The example operations may be performed in any order and in any combination. It should be appreciated that these operations need not be performed in order presented. Circuitries, components, features, or operations which are comprised in a dashed line may be considered optional.
  • a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc.
  • program circuitries may include routines, programs, objects, components, data structures, etc. that perform specified tasks or implement specific abstract data types.
  • Computer-executable instructions, associated data structures, and program circuitries represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
  • the proposal can be for example: a) Allow eDRX >10,24s for RRC-lnactive b) RAN may buffer MT data in case it judges it is feasible, or drops it which could lead to that RAN triggers the CM release (N2 msg), “kind of paging failure”. c) If NAS data can’t be delivered (page the UE within the NAS timer range i.e.
  • RAN triggers the CM release (N2 msg - UE context release request), “kind of paging failure” d) It may be needed that RAN together with the CM release request also updates the CN with the UE’s eDRX RRC-lnactive configuration based on RRC configuration. So the CN knows when to issue a retransmission of the NAS msg. e) CN does NOT handle HLcom in CM-connected state.
  • a UE While in eDRX, a UE may move between RNAs that have no connectivity. During this time period DL data may arrive and be buffered at old gNB that holds the UE Context. When the UE leaves the eDRX cycle, it may be under coverage and be served by a gNB that has no connectivity to old gNB. Thus the DL data buffered at old gNB can’t be forwarded.
  • the solution is updated with new functionality addressing how to handle UE mobility outside the RNA and when a Xn interface between the new and old RAN node does not exist.
  • This solution relates the Kl#1 and proposes a solution where extended buffering of MT data is in RAN when a RedCap UE uses long eDRX. Furthermore, the solution supports notification to the AMF for UE unavailability due to use of long eDRX as response to MT signaling.
  • - RAN is responsible for paging and will apply paging strategy considering the UE PTW configuration.
  • the PTW configuration is provided to NG-RAN in the RRC Inactive Assistance Information as described in TS 23.501 [x] and TS 38.413 [y].
  • N2 msg may buffer MT data in case it finds it feasible or triggers the UE context release (N2 msg).
  • N2 msg UE context release
  • the N2 message could be the UE Context Release Request message which RAN use to notify the AMF of RAN paging failure.
  • the message may need to be extended to include that the failure was due to eDRX configuration.
  • TSG RAN3 is responsible for N2 messages and their format.
  • RAN triggers the UE context release (N2 msg - UE context release request), with cause value indicating that the UE is not currently reachable for MT signaling.
  • the N2 message used to deliver the failure could be the UE Context Release Request message which RAN use to notify the AMF of RAN paging failure.
  • the message may need to be extended to include that the failure was due to eDRX configuration.
  • Sending an N2 notification instead of UE Context release request could be an alternative to prevent that the UE is moved to CM-ldle state in the AMF.
  • TSG RAN3 is responsible for N2 messages and their format.
  • the Core network does not handle HLcom features, see TS 23.501 [x] clause 5.31.8, in CM-Connected state. Specifically, the core network does not support extended buffering (as the extended buffering is done in RAN), notification service for UE Reachability, Availability after DDN failure, and Downlink Data Delivery Status.
  • RAN is responsible for RAN based paging within a RAN Notification Area (RNA).
  • RNA RAN Notification Area
  • Long eDRX may increase the possibility that UE moved outside the RNA and possible further away from the RNA. It is proposed that UE mobility and buffered MT data in the old RAN anchor Node should be handled based on the following principles:
  • the new gNB can retrieve the UE context (based on procedures in TS 38.413) and also retrieve the extended buffered MT data and deliver the data to the UE.
  • the new gNB is outside the RNA and has NOT an Xn interface between the new gNB and old RAN anchor node, the new gNB is not able to retrieve the UE context and extended buffered Data from the old RAN anchor node.
  • the new gNB can request assistance from the Core Network in retrieving the UE context and extended buffered data.
  • the old gNB may request the AMF to escalate the paging in a wider area.
  • Figure 6.X.3.1-1 Procedure for handling MT signalling when UE is in RRC-lnactive with long eDRX 0.
  • UE is in RRC-lnactive/CM-Connected state configured by the RAN node to apply long eDRX in RRC-lnactive.
  • the eDRX value could be either the value received by the AMF during the registration or a different eDRX value configured by RAN when the UE is released to RRC-lnactive.
  • the AMF send NAS message towards the UE.
  • the RAN node determines when the UE will become reachable next time according to the eDRX scheme. If the UE will become reachable before NAS retransmission timer expires, then the RAN will page the UE and deliver the NAS message to the UE according to step 6.
  • the RAN node will send a failure to deliver the NAS message if the UE will not become reachable before NAS retransmission timer expires.
  • the N2 message used to deliver the failure could be the UE Context Release Request message which RAN use to notify the AMF of RAN paging failure.
  • the message may need to be extended to include that the failure was due to eDRX configuration.
  • TSG RAN3 is responsible for N2 messages and their format.
  • the AMF will decide whether to wait until the UE becomes reachable next time based on the eDRX scheme or to release the UE context in RAN and move the UE to CM-ldle state.
  • the AMF may use the eDRX value stored in the MM UE context to determine when the UE becomes reachable again.
  • the AMF retransmits the NAS message in conjunction to the next PTW.
  • RAN B pages the UE and delivers the MT NAS message.
  • UE is in RRC-lnactive/CM-Connected state configured by the RAN node to apply long eDRX in RRC-lnactive.
  • the eDRX value could be either the value received by the AMF during the registration or a different eDRX value configured by RAN when the UE is released to RRC-lnactive.
  • MT Data for the UE is forwarded to the RAN node.
  • the RAN node determines when the UE will become reachable next time according to the eDRX scheme.
  • the RAN may decide to buffer the DL data until next PTW, then the RAN will page the UE and deliver the DL data to the UE according to step 5.
  • the RAN node will send a failure to page the UE if the time until the UE becomes reachable is longer than the maximum buffering time configuration in RAN or if RAN based paging failed due to lack of response from the UE.
  • the N2 message used to deliver the failure could be the UE Context Release Request message which RAN use to notify the AMF of RAN paging failure. The message may need to be extended.
  • TSG RAN3 is responsible for N2 messages and their format.
  • the AMF may decide release the UE context in RAN and move the UE to CM-ldle state. RAN drops the MT data after receiving the UE Context Release message. Alternatively, the AMF may decide to escalate the paging in the Registration Area (RA) i.e to RAN nodes outside the RNA. If the AMF is able to page the UE, then the AMF triggers data forwarding from the old RAN node to the new RAN node instead of sending the UE Context Release message to the old RAN node.
  • RA Registration Area
  • the AMF may use the eDRX value stored in the MM UE context to determine when the UE becomes reachable again. Data forwarding between two RAN nodes could reuse steps used for N2 based handover in TS 23.502 clause 4.9.1.3.
  • the paging escalation is an alternative or a complement to the new gNB requesting assistance to retrieve the buffered data in 6.x.3.3. It is FFS if any changes are needed to the N2 message sent in step 3. Furthermore, to make efficient use of this alternative it would be good if the N2 message in step 3 is sent while there are POs remaining in the PTW.
  • RAN pages the UE and delivers the DL data.
  • UE is in RRC-lnactive/CM-Connected state configured by the RAN node to apply long eDRX in RRC-lnactive.
  • the eDRX value could be either the value received by the AMF during the registration or a different eDRX value configured by RAN when the UE is released to RRC-lnactive.
  • MT Data to the UE is forwarded to the old RAN node.
  • the UE detects that it is outside the configured RNA and send an RNA Update due to mobility to the new RAN node.
  • the new RAN node will send a N2 message requesting assistance from the AMF to retrieve the UE context. 4.
  • the AMF based on the received UE temporary (i.e. I-RNTI which includes the ID of the old RAN node), tries to retrieve the UE context from the old RAN node. If the AMF is not able to retrieve the UE context, then the AMF responds to the new RAN node with a failure to do so. Based on this failure the new RAN node will reject the RNA Update due to mobility.
  • the AMF request to retrieve the UE context from the old RAN node. 6.
  • the Old RAN node forwards the UE context as a transparent container to the AMF and then the AMF forwards the UE context to the old RAN node
  • the new RAN node delivers the data to the UE before releasing the UE with new RNA configuration.
  • the new RAN node also performs path switch procedure according to TS 23.502 [y] clause 4.9.1.2.2.

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  • Mobile Radio Communication Systems (AREA)

Abstract

Est divulgué un procédé, mis en œuvre par un premier nœud de réseau radio, de radiomessagerie d'un dispositif sans fil pour reprendre une communication. Le dispositif sans fil est connecté à un nœud de réseau central. Le premier nœud de réseau radio dessert une première zone de notification de réseau d'accès radio, RNA, associée au dispositif sans fil. Le procédé comprend, lors de l'échec de la réception d'une réponse de radiomessagerie (S101-S101A) du dispositif sans fil à un message de radiomessagerie comprenant un identifiant temporaire de réseau d'accès radio attribué à la première RNA, l'envoi (S103), au nœud de réseau central, d'un message d'instruction ordonnant au nœud de réseau central de transmettre un message de demande de radiomessagerie à un ou plusieurs nœuds de réseau radio en dehors de la première RNA. Le message de demande comprend une indication de transmission d'un message de radiomessagerie au dispositif sans fil en dehors de la première RNA à l'aide d'un identifiant temporaire attribué au dispositif sans fil.
PCT/EP2023/050496 2022-01-28 2023-01-10 Procédés de radiomessagerie d'un dispositif sans fil pour reprendre une communication et dispositifs associés WO2023143908A1 (fr)

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US20180270895A1 (en) * 2017-03-17 2018-09-20 Ofinno Technologies, Llc Radio Access Network Notification Area Update Failure
WO2020176032A2 (fr) * 2019-02-27 2020-09-03 Telefonaktiebolaget Lm Ericsson (Publ) Mobilité de dispositif sans fil entre des réseaux de communication sans fil
US20210014915A1 (en) * 2018-04-04 2021-01-14 Huawei Technologies Co., Ltd. Communication Method and Communications Apparatus
WO2021160928A1 (fr) * 2020-02-13 2021-08-19 Nokia Technologies Oy Radiomessagerie dans des systèmes sans fil

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US20180270895A1 (en) * 2017-03-17 2018-09-20 Ofinno Technologies, Llc Radio Access Network Notification Area Update Failure
US20210014915A1 (en) * 2018-04-04 2021-01-14 Huawei Technologies Co., Ltd. Communication Method and Communications Apparatus
WO2020176032A2 (fr) * 2019-02-27 2020-09-03 Telefonaktiebolaget Lm Ericsson (Publ) Mobilité de dispositif sans fil entre des réseaux de communication sans fil
WO2021160928A1 (fr) * 2020-02-13 2021-08-19 Nokia Technologies Oy Radiomessagerie dans des systèmes sans fil

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Title
"3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; System architecture for the 5G System (5GS); Stage 2 (Release 17)", vol. SA WG2, no. V17.3.0, 23 December 2021 (2021-12-23), pages 1 - 559, XP052083263, Retrieved from the Internet <URL:https://ftp.3gpp.org/Specs/archive/23_series/23.501/23501-h30.zip 23501-h30.docx> [retrieved on 20211223] *
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