WO2023104573A1 - Restriction d'accès basée sur une zone de suivi secondaire - Google Patents

Restriction d'accès basée sur une zone de suivi secondaire Download PDF

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Publication number
WO2023104573A1
WO2023104573A1 PCT/EP2022/083492 EP2022083492W WO2023104573A1 WO 2023104573 A1 WO2023104573 A1 WO 2023104573A1 EP 2022083492 W EP2022083492 W EP 2022083492W WO 2023104573 A1 WO2023104573 A1 WO 2023104573A1
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WIPO (PCT)
Prior art keywords
infrastructure equipment
wireless communications
tracking area
communications device
secondary tracking
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PCT/EP2022/083492
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English (en)
Inventor
Vivek Sharma
Yuxin Wei
Yassin Aden Awad
Hideji Wakabayashi
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Sony Group Corporation
Sony Europe B.V.
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Application filed by Sony Group Corporation, Sony Europe B.V. filed Critical Sony Group Corporation
Publication of WO2023104573A1 publication Critical patent/WO2023104573A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the present disclosure relates to communications devices, infrastructure equipment, core network parts and methods for the transmission of data by a communications device, an infrastructure equipment, and a core network part in a wireless communications network.
  • Latest generation mobile telecommunication systems are able to support a wider range of services than simple voice and messaging services offered by earlier generations of mobile telecommunication systems.
  • a user is able to enjoy high data rate applications such as mobile video streaming and mobile video conferencing that would previously only have been available via a fixed line data connection.
  • the demand to deploy such networks is therefore strong and the coverage area of these networks, i.e. geographic locations where access to the networks is possible, is expected to continue to increase rapidly.
  • Future wireless communications networks will be expected to efficiently support communications with an ever-increasing range of devices and data traffic profiles than existing systems are optimised to support. For example, it is expected future wireless communications networks will be expected to efficiently support communications with devices including reduced complexity devices, machine type communications devices, high resolution video displays, virtual reality headsets and so on. Some of these different types of devices may be deployed in very large numbers, for example low complexity devices for supporting the “The Internet of Things”, and may typically be associated with the transmissions of relatively small amounts of data with relatively high latency tolerance.
  • RRC Radio Resource Control
  • RRC connected mode When a terminal device transmits data, RRC connected mode is generally used.
  • the RRC idle mode is for terminal devices which are registered to the network (EMM-REGISTERED), but not currently in active communication (ECM-IDLE).
  • the wireless networks referred to above generally utilise tracking areas or registration areas defined by operators in order to track terminal devices to a particular geographical region consisting of a number of cells.
  • a terminal device may roam within this tracking/registration area without transmitting update messages to the core network and as such the core network may be aware of the tracking area or registration area in which a terminal device in idle mode is located.
  • tracking areas and registration areas generally cover a large geographical area and therefore do not provide the core network with a precise indication of the location of an idle mode terminal device. Without more precise knowledge of an idle mode terminal device’s location, it can be difficult or even impossible to implement certain network features. Furthermore, tracking and registration areas are generally defined when the wireless telecommunications networks are deployed and as such it is an extensive and difficult job for network operators to adjust tracking and registration areas in existing networks.
  • the present inventors have identified new techniques for addressing some of these challenges with wireless communications networks.
  • An infrastructure equipment associated with a first coverage area in a wireless communications network configured to transmit data to and/or receive data from a wireless communications device within the first coverage area, and to transmit the data to or receive the data from a core network part of the wireless communications network
  • the infrastructure equipment comprising: a receiver configured to receive radio signals transmitted by the wireless communications device via a wireless access interface, a transmitter configured to transmit radio signals to the wireless communications device via the wireless access interface, and a controller configured to control the transmitter and the receiver to transmit data to or receive data from the wireless communications device and to transmit the data to or receive the data from the core network part via an interface with the core network, wherein the controller is configured with the receiver and transmitter to: receive, from the core network part, an identifier for a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the
  • a wireless communications device configured to transmit radio signals to and/or receive radio signals in a first coverage are from an infrastructure equipment communicable with a core network part, the wireless communications device comprising: a receiver configured to receive radio signals transmitted by the infrastructure equipment via a wireless access interface, a transmitter configured to transmit radio signals to the infrastructure equipment via the wireless access interface, and a controller configured to control the transmitter and the receiver to transmit data to or receive data from the wireless communications network via the infrastructure equipment, wherein the controller is configured with the receiver and transmitter to: obtain, based on transmitted information received from the infrastructure equipment, an identifier for a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the infrastructure equipment is associated; determine, based on the identifier for the secondary tracking area associated with the first coverage area, whether the communications device is permitted access to the
  • a core network part of a wireless communications network configured to transmit signals to and/or receive signals from a plurality of infrastructure equipment in the wireless communications network
  • the core network part comprising: a receiver configured to receive signals transmitted by a first infrastructure equipment associated with a first coverage area via an access interface, a transmitter configured to transmit signals to the first infrastructure equipment via the access interface, and a controller configured to control the transmitter and the receiver to transmit data to or receive data from the first infrastructure equipment, wherein the controller is configured with the receiver and transmitter to: receive a definition of a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas each associated with an infrastructure equipment, wherein each of the one or more coverage areas is associated with a particular infrastructure equipment of the plurality of infrastructure equipment, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the first infrastructure equipment is associated; and transmit an identifier
  • Figure 1 schematically represents some aspects of an LTE-type wireless telecommunication system which may be configured to operate in accordance with certain embodiments of the present disclosure
  • Figure 2 schematically represents some aspects of a new radio access technology (RAT) wireless telecommunications system which may be configured to operate in accordance with certain embodiments of the present disclosure
  • Figure 3 is a schematic block diagram of an example infrastructure equipment and communications device which may be configured in accordance with example embodiments;
  • RAT new radio access technology
  • Figure 4 is an illustration of a secondary tracking area and its relationship with a tracking area.
  • Figure 5 illustrates a system including a terminal device, a base station, and a core network part according to an example of the disclosure.
  • Figure 6 illustrates a system including a terminal device, a base station, and a core network part according to an example of the disclosure.
  • Figure 7 shows a flow chart of a method for a base station according to an example of the disclosure.
  • Figure 8 shows a flow chart of a method for a terminal device according to an example of the disclosure.
  • Figure 9 shows a flow chart of a method for a core network part according to an example of the disclosure.
  • Figure 1 provides a schematic diagram illustrating some basic functionality of a mobile telecommunications network I system 100 operating generally in accordance with LTE principles, but which may also support other radio access technologies, and which may be adapted to implement embodiments of the disclosure as described herein.
  • Various elements of Figure 1 and certain aspects of their respective modes of operation are well-known and defined in the relevant standards administered by the 3GPP (RTM) body, and also described in many books on the subject, for example, Holma H.
  • the network 100 includes a plurality of base stations 101 connected to a core network part 102.
  • Each base station provides a coverage area 103 (e.g. a cell) within which data can be communicated to and from communications devices 104.
  • Data is transmitted from the base stations 101 to the communications devices 104 within their respective coverage areas 103 via a radio downlink.
  • Data is transmitted from the communications devices 104 to the base stations 101 via a radio uplink.
  • the core network part 102 routes data to and from the communications devices 104 via the respective base stations 101 and provides functions such as authentication, mobility management, charging and so on.
  • Communications devices may also be referred to as mobile stations, user equipment (UE), user terminals, mobile radios, terminal devices, and so forth.
  • Base stations which are an example of network infrastructure equipment I network access nodes, may also be referred to as transceiver stations I nodeBs I e-nodeBs, g-nodeBs (gNB) and so forth.
  • I nodeBs I e-nodeBs
  • g-nodeBs gNB
  • different terminology is often associated with different generations of wireless telecommunications systems for elements providing broadly comparable functionality.
  • example embodiments of the disclosure may be equally implemented in different generations of wireless telecommunications systems such as 5G or new radio as explained below, and for simplicity certain terminology may be used regardless of the underlying network architecture. That is to say, the use of a specific term in relation to certain example implementations is not intended to indicate these implementations are limited to a certain generation of network that may be most associated with that particular terminology.
  • FIG. 2 is a schematic diagram illustrating a network architecture for a new RAT wireless communications network / system 200 based on previously proposed approaches which may also be adapted to provide functionality in accordance with embodiments of the disclosure described herein.
  • the new RAT network 200 represented in Figure 2 comprises a first communication cell 201 and a second communication cell 202.
  • Each communication cell 201 , 202 comprises a controlling node (centralised unit) 221 , 222 in communication with a core network component 210 over a respective wired or wireless link 251 , 252.
  • the respective controlling nodes 221 , 222 are also each in communication with a plurality of distributed units (radio access nodes I remote transmission and reception points (TRPs)) 211 , 212 in their respective cells.
  • TRPs remote transmission and reception points
  • the distributed units 211 , 212 are responsible for providing the radio access interface for communications devices connected to the network.
  • Each distributed unit 211 , 212 has a coverage area (radio access footprint) 241 , 242 where the sum of the coverage areas of the distributed units under the control of a controlling node together define the coverage of the respective communication cells 201 , 202.
  • Each distributed unit 211 , 212 includes transceiver circuitry for transmission and reception of wireless signals and processor circuitry configured to control the respective distributed units 211 , 212.
  • the core network component 210 of the new RAT communications network represented in Figure 2 may be broadly considered to correspond with the core network 102 represented in Figure 1 , and the respective controlling nodes 221 , 222 and their associated distributed units I TRPs 211 , 212 may be broadly considered to provide functionality corresponding to the base stations 101 of Figure 1.
  • the term network infrastructure equipment I access node may be used to encompass these elements and more conventional base station type elements of wireless communications systems.
  • the responsibility for scheduling transmissions which are scheduled on the radio interface between the respective distributed units and the communications devices may lie with the controlling node I centralised unit and I or the distributed units I TRPs.
  • a communications device or UE 260 is represented in Figure 2 within the coverage area of the first communication cell 201. This communications device 260 may thus exchange signalling with the first controlling node 221 in the first communication cell via one of the distributed units 211 associated with the first communication cell 201. In some cases communications for a given communications device are routed through only one of the distributed units, but it will be appreciated that in some other implementations communications associated with a given communications device may be routed through more than one distributed unit, for example in a soft handover scenario and other scenarios.
  • two communication cells 201 , 202 and one communications device 260 are shown for simplicity, but it will of course be appreciated that in practice the system may comprise a larger number of communication cells (each supported by a respective controlling node and plurality of distributed units) serving a larger number of communications devices.
  • Figure 2 represents merely one example of a proposed architecture for a new RAT communications system in which approaches in accordance with the principles described herein may be adopted, and the functionality disclosed herein may also be applied in respect of wireless communications systems having different architectures.
  • example embodiments of the disclosure as discussed herein may be implemented in wireless telecommunication systems I networks according to various different architectures, such as the example architectures shown in Figures 1 and 2. It will thus be appreciated that the specific wireless communications architecture in any given implementation is not of primary significance to the principles described herein. In this regard, example embodiments of the disclosure may be described generally in the context of communications between network infrastructure equipment I access nodes and a communications device, wherein the specific nature of the network infrastructure equipment I access node and the communications device will depend on the network infrastructure for the implementation at hand.
  • the network infrastructure equipment I access node may comprise a base station, such as an LTE-type infrastructure equipment 101 as shown in Figure 1 which is adapted to provide functionality in accordance with the principles described herein, and in other examples the network infrastructure equipment I access node may comprise a control unit I controlling node 221 , 222 and / or a TRP 211 , 212 of the kind shown in Figure 2 which is adapted to provide functionality in accordance with the principles described herein.
  • a base station such as an LTE-type infrastructure equipment 101 as shown in Figure 1 which is adapted to provide functionality in accordance with the principles described herein
  • the network infrastructure equipment I access node may comprise a control unit I controlling node 221 , 222 and / or a TRP 211 , 212 of the kind shown in Figure 2 which is adapted to provide functionality in accordance with the principles described herein.
  • FIG. 3 A more detailed illustration of a UE/communications device 270 (which may correspond to a communications device such as the communications device 260 of Figure 2 or the communications device 104 of Figure 1) and an example network infrastructure equipment 272, which may be thought of as a base station 101 or a combination of a controlling node 221 and TRP 211 , is presented in Figure 3.
  • the UE 270 is shown to transmit uplink data to the infrastructure equipment 272 via uplink resources of a wireless access interface as illustrated generally by an arrow 274 from the UE 270 to the infrastructure equipment 272.
  • the UE 270 may similarly be configured to receive downlink data transmitted by the infrastructure equipment 272 via downlink resources as indicated by an arrow 288 from the infrastructure equipment 272 to the UE 270.
  • the infrastructure equipment 272 is connected to a core network 276 via an interface 278 to a controller 280 of the infrastructure equipment 272.
  • the infrastructure equipment 272 includes a receiver 282 connected to an antenna 284 and a transmitter 286 connected to the antenna 284.
  • the UE 270 includes a controller 290 connected to a receiver 292 which receives signals from an antenna 294 and a transmitter 296 also connected to the antenna 294.
  • the controller 280 is configured to control the infrastructure equipment 272 and may comprise processor circuitry which may in turn comprise various sub-units I sub-circuits for providing functionality as explained further herein. These sub-units may be implemented as discrete hardware elements or as appropriately configured functions of the processor circuitry. Thus the controller 280 may comprise circuitry which is suitably configured I programmed to provide the desired functionality using conventional programming I configuration techniques for equipment in wireless telecommunications systems.
  • the transmitter 286 and the receiver 282 may comprise signal processing and radio frequency filters, amplifiers and circuitry in accordance with conventional arrangements.
  • the transmitter 286, the receiver 282 and the controller 280 are schematically shown in Figure 3 as separate elements for ease of representation.
  • the functionality of these elements can be provided in various different ways, for example using one or more suitably programmed programmable computer(s), or one or more suitably configured application-specific integrated circuit(s) I circuitry I chip(s) I chipset(s).
  • the infrastructure equipment 272 will in general comprise various other elements associated with its operating functionality.
  • the controller 290 of the UE 270 is configured to control the transmitter 296 and the receiver 292 and may comprise processor circuitry which may in turn comprise various sub-units I sub-circuits for providing functionality as explained further herein. These sub-units may be implemented as discrete hardware elements or as appropriately configured functions of the processor circuitry.
  • the controller 290 may comprise circuitry which is suitably configured I programmed to provide the desired functionality using conventional programming I configuration techniques for equipment in wireless telecommunications systems.
  • the transmitter 296 and the receiver 292 may comprise signal processing and radio frequency filters, amplifiers and circuitry in accordance with conventional arrangements.
  • the transmitter 296, receiver 292 and controller 290 are schematically shown in Figure 3 as separate elements for ease of representation.
  • the functionality of these elements can be provided in various different ways, for example using one or more suitably programmed programmable computer(s), or one or more suitably configured application-specific integrated circuit(s) I circuitry I chip(s) I chipset(s).
  • the communications device 270 will in general comprise various other elements associated with its operating functionality, for example a power source, user interface, and so forth, but these are not shown in Figure 3 in the interests of simplicity.
  • the controllers 280, 290 may be configured to carry out instructions which are stored on a computer readable medium, such as a non-volatile memory.
  • a computer readable medium such as a non-volatile memory.
  • the processing steps described herein may be carried out by, for example, a microprocessor in conjunction with a random access memory, operating according to instructions stored on a computer readable medium.
  • Ts Tracking Areas
  • a Tracking Area is a collection of cells covering a particular geographical area where a UE can roam in idle mode, without being required to send update messages or other signalling to the core network.
  • a UE when a UE is in an idle mode (i.e. an RRC idle state), the location of the UE is known at the TA level.
  • a UE may be configured with a specific TA (or list of TAs) which it can move between in idle mode.
  • a TA might, for example, consist of 10 cells, where a UE roaming within these 10 cells is not required to send tracking updates to the network. In this manner, the quantity of signalling the UE is required to perform when in an idle mode is reduced.
  • a base station may broadcast a TA identifier for the TA in which the base station (i.e. the cell provided by the base station) is included.
  • the TA identifier may, for example, be included in system information broadcast by the base station for receipt by UEs.
  • the UE may then register with the base station and (for example, as part of the registration procedure) report the identifier of the TA to which it is connected to the core network (via the base station). In this manner, the core network is aware of the TA to which the UE is connected.
  • 5G networks may use a Registration Area (RA) procedure, where a Registration Area consists of one or more TAs.
  • RA information may be exchanged between the core network and UEs during a Non-Access Stratum (NAS) registration procedure.
  • An RA update procedure is triggered during initial registration (e.g. NAS registration) of a UE to a RA/TA, upon expiry of a timer for the UE to initiate the update procedure, and/or when the UE moves out of a TA.
  • the core network is aware that the UE is present within the network, but the radio access network (RAN) part (comprising radio network infrastructure equipment such as the base stations 101 of Figure 1 and the combined TRPs I CUs of Figure 2) is not.
  • the core network is aware of the location of idle mode UEs at a paging tracking area level but not at the level of individual transceiver entities, because the UE does not have a unique identifier within a cell (C-RNTI).
  • C-RNTI unique identifier within a cell
  • the core network will generally assume a UE is located within the tracking area(s) associated with a transceiver entities most recently used for communicating with the UE, unless the UE has since provided a specific tracking area update (TAU) to the network.
  • TAU tracking area update
  • idle mode UEs are typically required to send a TAU when they detect they have entered a different tracking area to allow the core network to keep track of their location.
  • the core network tracks UEs at a tracking area level, it is generally not possible for the network infrastructure to know which specific transceiver entities (radio network node) to use when seeking to initiate contact with a UE in idle mode.
  • Paging messages i.e. signals
  • the base stations within the TA/RA in which the UE is located where the paging messages are transmitted to all UEs within the cells of the TA/RA.
  • UEs in an idle mode periodically monitor for such paging messages and decode received paging messages to determine if the paging message is intended for itself. For UEs operating in a discontinuous reception (DRX) mode this occurs each time they wake up for their DRX active time.
  • DRX discontinuous reception
  • Paging signals for a specific terminal device are transmitted in defined frames (Paging Frames) I sub-frames (Paging Occasions) which are derived from the International Mobile Subscriber Identifier (I MSI) of the terminal device, as well as paging related DRX parameters established in system information transmitted within the network.
  • Paging Frames I sub-frames
  • I MSI International Mobile Subscriber Identifier
  • a UE In idle mode, a UE is addressed by first paging the cells within the tracking area.
  • the UE monitors for P-RNTI (paging identifier) on PDCCH rather than C-RNTI as it does in RRC connected state.
  • P-RNTI paging identifier
  • the paging message which is received following P-RNTI detection contains the UE identity, and if the UE receives this it will then respond by establishing an RRC connection and having a C-RNTI assigned.
  • TA size (i.e. number of cells) of a TA is important.
  • a large TA results in increased UE power consumption due to being required to decode paging messages for potentially a large number of UEs.
  • a small TA results in a large paging signaling load within the core network, as paging messages for various UEs are sent to a large number of TAs.
  • TAs will be fixed by the core network, as these would have been established when the 5G network was deployed, and it can be a challenging and extensive task for an operator to adjust TAs, particularly after various additional features are introduced into the network.
  • WWC Wireless Wirelines Convergence
  • RG residential gateway
  • FWA Fixed Wireless Access
  • WWC is set out in 3GPP TS #23.316 [2]
  • An FWA device can connect to the core network and may use the same TA and other identifiers applicable to that geographical area as mobile (non- FWA) devices.
  • a cell and the core network may support both fixed and mobile users.
  • TAs are generally larger than this and, as discussed above, are challenging to reconfigure.
  • the present inventors have identified a desire to allow for the restriction of UE access using WWC with finer granularity than the TA level.
  • ATSSS Access T raffic Steering, Switching and Splitting
  • ATSSS is a means for allowing the steering, switching or splitting of traffic across multiple concurrent accesses and is set out in 3GPP TS #23.501 [3] and #24.193 [4].
  • MA PDU Multi-Access Protocol Data Unit
  • LADN Local Area Data Network
  • a Local Area Data Network is a data network that a UE is only able to access at a particular geographic location.
  • one leg of the MA PDU session is over a 3GPP network
  • the other leg of the MA PDU session is over a non-3GPP network, such as a Wireless Local Area Network (WLAN).
  • WLAN Wireless Local Area Network
  • all traffic for an MA PDU session (e.g. all traffic for a given service) may be transmitted over the WLAN leg, and thus the UE may be in an idle mode for the 3GPP cell.
  • the (3GPP) core network is not aware that the UE is in idle mode, as when in idle mode the UE does not perform any signaling with the core network.
  • 3GPP service requirements may require that a UE should stop exchanging data over non- 3GPP access when the UE moves outside of the LADN.
  • the core network is not aware that the UE has moved outside of the LADN, the core network cannot force the UE to do so, and as such the 3GPP service requirement cannot be fulfilled. For this reason, MA PDU sessions are generally not currently permitted when a UE accesses a LADN. Accordingly, the present inventors have identified a desire to enable ATSSS support when a UE accesses services in a LADN.
  • STA Secondary Tracking Area
  • STA Secondary Tracking Area
  • SRA secondary Registration Area
  • An STA or SRA is a collection of one or more coverage areas within a TA or an RA, which provide finer granularity than the corresponding TAs or RAs.
  • an STA may be a subset of the cells of a TA or even a portion or subdivision of a cell, which are assigned an STA identifier.
  • STAs may therefore be used in a similar manner to TAs in order to allow a UE’s location to be determined with finer granularity (i.e. greater precision). However, this finer granularity can be achieved without requiring operators to carry out the difficult task of reconfiguring existing tracking areas (TAs) within the network.
  • TAs tracking areas
  • FIG. 4 shows an example of a secondary tracking area (STA) 420 in relation to a tracking area (TA) 400.
  • a TA 400 includes a plurality of cells 410A to 4101.
  • the core network is only aware that the UE is located somewhere within the TA 400, but is not aware of which specific cell 410A-I the UE is located within.
  • the UE sends a TA update to the core network.
  • the establishment, setup and configuration of TAs is understood by the person skilled in the art.
  • the cells 410A and 410B are part of the TA 400, which includes cells 410A-410I, however the cells 410A and 410B are also part of a secondary tracking area 420. Therefore, STA 420 includes a subset of the cells 410 included in the TA 400.
  • the TA 400 includes 9 cells 410, while the STA includes only 2 cells 410A, 410B, however it is appreciated that the number of cells in the TA and the number of cells of said TA included within the STA may vary, provided the number of cells included in the STA is smaller than the number of cells of the TA(s) in which the cells of the STA are also included.
  • the cells of an STA are a subset of cells included within a TA.
  • a TA may include multiple STAs, and, for example, every cell within a TA may be assigned to an STA, or in some cases a particular cell may be assigned to an STA but not to a TA, or vice versa.
  • an STA may span multiple TAs.
  • an STA may include a plurality of cells, where the plurality of cells are chosen from the cells of two or more TAs, where the plurality of cells of the STA include at least one cell from each of the two or more TAs, such that the STA includes cells belonging to at least two TAs.
  • the STA includes only a subset of the cells included within each of the TAs.
  • An STA spanning multiple TAs is expected to be useful for UEs within a vehicle (e.g. a moving train) as a moving vehicle may cover long distances potentially spanning multiple TAs. Accordingly, an operator can carefully define an STA (i.e. select the cells to be included within an STA), for example along a train route, in order to manage the number of STAs a UE moves between along the route, thereby reducing the quantity of signaling required in order for a UE to inform the core network of its location.
  • an STA spanning multiple TAs may be helpful in the case of an undesirable border between TAs.
  • a large house may be covered by multiple cells which belong to different TAs.
  • a tracking area update (TAU) is likely to be transmitted by a communications device for example when a user moves from a room of a house to another room of the house (which is included in a different TA, despite being located in the same house).
  • TAU tracking area update
  • an STA may be defined such that the house is covered with single STA, rather than multiple TAs.
  • an STA While in the example of Figure 4 an STA is shown as being multiple cells (specifically a subset of cells of one or more TAs), an STA may in some examples, be a single cell, or even a portion or subdivision of a cell.
  • an STA may be a cell, such as communication cells 201 , or 202 of Figure 2, or communication cells 410A-I, or an STA may be a subset of a cell, such as one or more coverage areas.
  • an STA may be one or more coverage areas such as coverage areas 241 or 242 shown in Figure 2 provided by distributed units 211 or 212, one or more vehicle-to-everything (V2X) zones, a range of GNSS locations, or an STA could be implemented by ranging signals and/or WLAN signals confined within an area (e.g. identifying indoor location) or a specific beam coverage area (as NR networks support directional beams within gNB coverage. In this manner, an STA may be more generally considered to include one or more coverage areas.
  • V2X vehicle-to-everything
  • the one or more coverage areas may include a subset of a cell, a subset of multiple cells, a cell, a cell and a subset of a second cell, multiple cells, or substantially any subdivision of coverage areas provided by any number of cells. Therefore, while Figure 4 is described in the context of a UE moving between cells of a TA, this discussion (and indeed the entire discussion of STAs of the present disclosure) is equally applicable to a UE moving between coverage areas of one or more cells.
  • the term “cell” is used herein to refer to one or more coverage areas, as discussed above.
  • STAs may be used to provide varying levels of location granularity depending on the specific nature of the device in question. For example, if the UE is located on a moving train (or some other high-speed vehicle) the UE may be configured to register only with an STA or with a TA (i.e. the UE may be required to send only STA update messages or TA update messages), depending on a status of the UE. In particular, if the UE is a high mobility UE, where there exists a desire to know the UE’s location with high accuracy at all times, a UE may be configured to register with STAs, but not with a TAs. Conversely, if the UE is a low-mobility UE where the location of the UE does not need to be known with high accuracy at all times, a UE may be configured to register with TAs, but not with a STAs.
  • the STA 420 of Figure 4 may function in a similar manner to the TA 400 in many respects. For example, when a UE leaves the STA 420 (or enters a new STA), the STA may be required to send an STA update message to the core network, in a similar manner to conventional TA update messages. Furthermore, a UE may be able to roam between the cells 410A, 410B of the STA 420 without having to send said STA update messages to the core network.
  • the core network may be aware that a UE in idle mode is located within the small group of cells corresponding to the STA 420, or a different coverage area defined as an STA, allowing the location of the idle mode UE to be more precisely known by the core network, without the core network being aware of the RAN topology, as may be the case if the location of a UE were known on a per-cell basis using an identifier of the cell.
  • an STA is a single cell or a portion or subdivision of a cell
  • the core network is made aware of the STA in which the UE is located, rather than an identifier of the cell (i.e.
  • the core network can be made aware of the location of the UE at cell-level granularity (or sub-cell-level granularity), without being aware of the RAN topology.
  • a base station providing a first cell e.g. cell 410A, 410B
  • the STA identifier may be included in system information broadcast to UEs (such as SIB1) within the cell, where the system information may also include the TA identifier for the TA in which the cell is included, as well as other cell access related information.
  • the STA may be broadcast using hexadecimal values where particular values (such as 0000 and FFFE) may be reserved, similar to TA, or a shorter format may be used.
  • a UE may connect to the cell and transmit a message to the core network indicating the STA in which the UE is connected/located. In this manner, the core network is aware of the STA in which a UE is located.
  • the UE may determine whether or not it is permitted to access the particular STA. The UE may do this by comparing the STA identifier with a list of STAs which the UE is permitted to access. The UE may already be configured with a list of permitted STAs, or the UE may receive the list of permitted STAs during a registration procedure (e.g. NAS Registration procedure). Therefore, if the UE, after receiving the STA identifier from the base station, is not able to cross-reference a list of permitted STAs (e.g.
  • the UE may initiate a registration procedure (e.g. a NAS registration procedure) with the base station. To do so, the UE may transmit a registration request message to the base station and may in response receive a list of permitted STAs. The UE may receive additional information in response to the registration request, as will be discussed later.
  • a registration procedure e.g. a NAS registration procedure
  • the UE Upon receiving the list of permitted STAs, the UE is then able to determine whether the STA identifier is present in the list of permitted STAs and therefore whether the UE is permitted to connect to the STA. If the STA is on the list of permitted STAs, the UE may camp on the cell. If, however, the STA is not on the list of permitted STAs, the UE may not camp on the cell. Instead, the UE may select another cell. The UE may do this based on any of a number of different factors, such as a frequency priority list, or an Intra Frequency Reselection Indicator (IFRI).
  • IFRI Intra Frequency Reselection Indicator
  • system information broadcast to UEs may include an IFRI bit that is applicable to the STA.
  • the STA identifier for the STA in which a cell is included is broadcast to UEs within the cell (for example within system information).
  • the STA identifier may not be broadcast to UEs within the cell and a UE may derive the STA identifier through other means.
  • a base station may not be adequately upgraded to support the broadcast of an STA identifier, and as such the STA identifier may be derived in a different way.
  • the STA identifier may be derived based on a TA identifier in which the STA is included, and an identifier of the particular cell.
  • the particular method of deriving the STA identifier may be standardized such that all UEs derive the STA identifier in the same way without ambiguity.
  • the UE may also take into account other considerations when calculating the TA identifier (for example if the cell identifier is shorter or longer in value than the TA identifier) such as a Most Significant Bit (MSB) or Least Significant Bit (LSB).
  • MSB Most Significant Bit
  • LSB Least Significant Bit
  • An operator may calculate STA identifiers (values) and inform the core network of the STA identifiers.
  • the core network may then provide STA identifiers to the appropriate base stations, where they are at some time communicated to UEs (for example in NAS signaling).
  • the UE may attempt to derive the STA identifier, for example based on the cell identifier and the TA identifier as described above.
  • the UE may determine that the cell does not support a particular feature. In a similar manner, if the value of the STA identifier value derived by the UE does not match the value of the STA identifier received by the UE (for example during NAS signaling), the UE may determine that it should not camp on the cell. The UE may then identify a new cell in a similar manner to that described above.
  • a UE moving out of a particular STA may perform an STA update procedure. That is, when a UE detects that it is moving out (or has already moved out) of a cell included in particular STA and into a new cell included in a new STA, the UE performs an STA update procedure.
  • a UE may detect that is has moved out of (or is moving out of) an STA based on receiving an STA identifier for a new STA that is different to a current STA identifier, or based on a UE otherwise calculating that it has moved (or is moving to) a new STA.
  • Such a procedure may be similar in many respects to the TA update procedure, which is understood by the person skilled in the art.
  • the STA update procedure may, for example be a NAS, Access Stratum (AS), or N2 procedure.
  • a UE may receive or determine an STA identifier associated with the new STA from the new cell, in a similar manner to that described above for initial registration of the UE to an STA.
  • a UE may then transmit an update message to the core network (via the previous cell or the new cell), informing the core network of the new STA in which the UE is located.
  • the UE may determine whether or not the UE is permitted to access the new STA, for example by comparing the new STA identifier with a list of permitted STAs. If the UE determines that the UE is permitted to access the new STA, the UE may camp on the new cell. Otherwise, if the UE determines that the UE is not permitted to access the new STA, the UE may select a new cell using the techniques described above, or may remain connected to the previous cell.
  • the UE may determine that it is not required to send STA updates when moving to the new STA, for example by determining based on the new STA identifier that the new STA is within a register of STAs where tracking updates are not required to be sent by the UE.
  • a UE may be able to roam between multiple specific STAs without sending STA update messages to the core network, or in other implementations a UE may be required to transmit STA update messages to the core network when moving between any STAs.
  • STAs as described above means that paging of UEs can be further optimized, as the location of a UE can be known by the core network at finer granularity than by traditional usage of TAs or RAs.
  • paging signaling load within the core network can be reduced, as paging messages are sent to fewer base stations due to the location of a UE being known more precisely.
  • STAs are smaller in the number of cells than TAs, UE power consumption can be reduced, as UEs are required to decode fewer paging messages, as there will on average be fewer UEs in the STA than in a TA.
  • an STA could be a portion or sub-division of a cell (e.g. one or more coverage areas within a cell) and may be used to identify a UE location by creating a zone (STA) within the cell.
  • STA zone
  • an STA could be either a combination of one or more vehicle-to-everything (V2X) zones with particular identifier(s), a range of GNSS locations, or an STA could be implemented by ranging signals and/or WLAN signals confined within an area (e.g. identifying indoor location) or a specific beam coverage area (as NR networks support directional beams within gNB coverage).
  • V2X vehicle-to-everything
  • a confined area may have one or more WLAN signals and a UE may assist the 3GPP network/a gNB to create a map of the confined area by reporting WLAN signals.
  • Ranging signals from the UE may define a perimeter of a certain distance, where distance may be configured by the network either with or without user assistance.
  • STAs can be used to provide benefits in the usage of Wireless Wirelines Convergence (WWC), which is discussed above.
  • WWC Wireless Wirelines Convergence
  • a UE’s location is known by the core network with greater precision when STAs are used in the network, the restriction of particular functionality or services to a smaller geographical location can be achieved. For example, it is possible for an operator to restrict the use of FWA devices outside of a home or other premises (i.e. when connected to a RG), or, for example, to allow a device to access particular (e.g. premium) services indoors only (i.e. when connected to an RG).
  • FIG. 5 illustrates an example system 500 incorporating the usage of STAs in conjunction with WWC.
  • a core network part 506 updates subscription information held in the core network to indicate whether the UE 502 is an FWA UE (i.e. the core network part determines whether the UE 502 is an FWA UE).
  • the UE 520 is an FWA UE.
  • the core network part 506 may also determine (for example by receiving from an operator) a secondary tracking area associated with a plurality of cells and an identifier of the secondary tracking area, where the plurality of cells are a subset of cells included within one or more tracking areas.
  • the definition of the secondary tracking area may include an indication of the base stations (i.e. gNBs) included within a particular secondary tracking area.
  • the core network part then shares 512 with a gNB 504 (e.g. via Operation, Administration and Maintenance (OAM) signalling) a secondary tracking area (STA) identifier in which the gNB 504 is included (i.e. the cell provided by the gNB 504 is included within the secondary tracking area).
  • the core network part 506 may also share with the gNB 504 a tracking area identifier with which the gNB 504 is associated (either separately from the STA identifier or as part of the same signalling).
  • the gNB 504 broadcasts signalling information 514 which includes the STA identifier received from the core network part 506.
  • the UE may determine the STA identifier through other means, as described above.
  • the UE 502 receives the STA identifier, for example by reading the signalling information broadcast 514 when entering the coverage area of the cell provided by the gNB 504, and may check to see whether the UE 502 is permitted access to the STA. The UE 502 may do this by determining whether the STA identifier is included on a list of permitted STAs. If the UE 502 does not possess a list of permitted STAs, or does not include an STA or TA configuration, the UE 502 initiates a NAS registration request by transmitting a NAS registration request message 518 to the core network 506.
  • the core network part 506 configures a list of one or more permitted STA (and may also configure one or more permitted TAs) for the FWA UE 502 and transmits a NAS registration acceptance message 520 to the UE 502.
  • the NAS registration acceptance message 520 indicates the list of permitted STAs (and may indicate the list of permitted TAs) for the UE 502.
  • the core network part 506 may provide the UE 502 with specific access parameters.
  • the UE 502 may be provided with access parameters defining restrictions on the UE’s access to network services.
  • these access parameters are FWA access parameters, defining restrictions on the UE’s access to network services as a result of the UE 502 being an FWA UE, however in other examples, the access parameters could be various other network restrictions.
  • the access parameters may, for example, define that the UE 502 is not permitted to access the network when connected to a cell within (or outside of) a particular STA, or that the UE 502 is permitted access to particular network services only when located within or outside of a particular STA.
  • These access parameters are merely examples, and the person skilled in the art would appreciate that many other access parameters could be implemented in the context of the present disclosure.
  • the UE 502 determines, for example based on the list of permitted STAs and the STA identifier, whether the UE 502 is permitted to access the network or access particular network services via the STA (i.e. via a cell that is part of the STA). If the STA is a permitted STA for the UE 502, the UE 502 may camp 522 on the cell (i.e. connect to and remain connected to the cell) provided by the gNB 504. If, however, the STA is not a permitted STA for the UE 502, the UE may select a new cell to connect to, for example based on I FRI , as described earlier.
  • the UE 502 determines that the STA is a permitted STA for the UE 502 and that the UE 502 is to camp 522 on the cell, the UE 502 reports 524 the STA identifier to the gNB 504. That is, the UE 502 may include the STA identifier in a message to the gNB 504 as part of an AMF selection process, where the STA identifier may be included in so-called ‘message 5’ of a RACH procedure in the AMF selection process, where AMF selection processes are understood by the person skilled in the art. The gNB 504 may then select an AMF for the UE 502, based on the STA identifier, which supports an FWA UE.
  • the selection of an AMF for the UE 502 may also be based on additional factors, such as a NAS Node Selection Function (NNSF), and the gNB 504 may be informed by the core network 506 of an appropriate AMF that supports WWC (e.g. by OAM signalling or during a setup process (e.g. NG-SETUP)).
  • NSF NAS Node Selection Function
  • the gNB 504 may then report 528 to the core network 506 that the UE 502 is located within the STA. In this manner, the core network 506 is aware of the STA in which the UE 502 is located. As the UE 502 is an FWA UE, the gNB 504 selects an AMF such that the gNB 504 does not trigger handover of the UE 502 to another cell that is outside of the STA.
  • the UE 502 may, when connected to the cell, read signalling information broadcasts (or other data) associated with other neighbouring cells, where an FWA cell (i.e. a cell that only supports FWA devices) will broadcast that it is an FWA cell (for example by transmitting an STA identifier associated with an STA dedicated to FWA devices). Accordingly, the UE 502 is able to determine whether a neighbouring cell is an FWA cell. The UE 502 may then report the FWA status of the neighbouring cell to the core network, for example as part of self-organizing network - automatic neighbour relations (SON-ANR) signalling.
  • SON-ANR self-organizing network - automatic neighbour relations
  • the connectivity of an FWA UE 502 can be restricted to a particular STA and thus, for example, to a small collection of cells (or a portion or subdivision of a cell, or a single cell, or a portion or subdivision of multiple cells), rather than only to a particular TA, which could potentially include a comparatively large number of cells.
  • UEs 502 may be allowed to access premium services solely within (or outside of) a particular STA (e.g. indoors). As such, WWC can be more effectively implemented in wireless communication networks through the use of STAs.
  • STAs can also be used to enable ATSSS support when a UE accesses services in a LADN.
  • a UE’s location can be known by the core network to be within a small number of cells (i.e. an STA), it is possible for the core network to identify when a UE has left a LADN. That is, if an STA is defined as the cells within a particular LADN, the UE will be required to send an STA update message to the core network when it leaves the STA and therefore when it also leaves the LADN. Accordingly, upon the UE leaving the LADN, the core network can instruct the UE to stop exchanging data over non-3GPP access. Therefore, as a UE can be prevented from exchanging data over non-3GPP access in an MA PDU session, ATSSS can be enabled for UEs accessing a LADN, without breaching the aforementioned service requirements of the 3GPP network.
  • Figure 6 illustrates an example system 600 incorporating the usage of STAs in conjunction with ATSSS.
  • a core network part may also determine that a UE 602 supports ATSSS, for example based on UE capability signaling .
  • the core network part 606 may also determine a secondary tracking area associated with a gNB 604.
  • the core network part 606 may determine the secondary tracking area itself, or may determine the secondary tracking area by receiving a definition of the secondary tracking area from an operator.
  • the core network part then shares 612 with a gNB 604 (e.g. via Operation, Administration and Maintenance (OAM) signalling) a secondary tracking area (STA) identifier in which the gNB 604 is included (i.e. the cell provided by the gNB 604 is included within the secondary tracking area).
  • the core network part 606 may also share with the gNB 604 a tracking area identifier with which the gNB 604 is associated (either separately from the STA identifier or as part of the same signalling).
  • the gNB 604 broadcasts signalling information 614 which includes the STA identifier received from the core network part 606.
  • the UE may determine the STA identifier through other means, as described above.
  • the UE 602 receives the STA identifier in a similar manner as described above in relation to Figure 5.
  • the UE 602 may read the signaling information broadcast when entering the coverage area of the cell provided by the gNB 604, and may check to see whether the UE 602 is permitted to utilise an MA PDU session within the STA (i.e. whether the STA is a permitted STA for the UE 602). The UE 602 may do this by determining whether the STA identifier is included on a list of permitted STAs.
  • the UE 602 If the UE 602 does not possess a list of permitted STAs, or does not include an STA or TA configuration, the UE 602 initiates a NAS registration request by transmitting a NAS registration request message 618 to the core network 606.
  • the core network part may configure an allowed STA in which the UE 602 is permitted to utilise an MA PDU session and transmits a NAS registration acceptance message 620 to the UE 602.
  • the NAS registration acceptance message 620 indicates the list of permitted STAs (and may indicate a list of allowed TAs) for the UE 602.
  • the core network part 606 may provide the UE 602 with specific access parameters.
  • the UE 602 may be provided with access parameters defining restrictions on the UE’s access to network services.
  • these access parameters are ATSSS access parameters, defining restrictions on the UE’s 602 ability to utilise an MA PDU session with the network, however in other examples, the access parameters could be various other network restrictions.
  • the access parameters may, for example, define that the UE 602 must stop accessing network services over a WLAN connection (i.e. the UE 620 must release any WLAN connection) when outside of a permitted STA.
  • These access parameters are merely examples, and the person skilled in the art would appreciate that many other access parameters could be implemented in the context of the present disclosure.
  • the UE 602 determines, for example based on the list of permitted STAs and the STA identifier, whether the STA is a permitted STA for the UE 602. If the STA is a permitted STA for the UE 602, the UE 602 may camp 622 on the cell (i.e. connect to and remain connected to the cell) provided by the gNB 604, and may utilise an MA PDU session. If, however, the STA is not a permitted STA for the UE 602, the UE may not utilise a MA PDU session and in some examples may select a new cell to connect to, for example based on IFRI or frequency priority, as described earlier.
  • the UE 602 determines that the STA is a permitted STA for the UE 602 and that the UE 602 is to camp 622 on the cell, the UE 602 reports 624 the STA identifier to the gNB 604. That is, the UE 602 may include the STA identifier in a message to the gNB 604 as part of an AMF selection process, where the STA identifier may be included in so-called ‘message 5’ of the AMF selection process, where the AMF selection process is understood by the person skilled in the art. The gNB 604 may then select an AMF for the UE 602, based on the STA identifier, that supports an MA PDU session.
  • the STA identifier may be added to a NAS Node Selection Function (NNSF), and the gNB 604 may be informed by the core network 606 of an appropriate AMF for the UE 602 (e.g. by OAM signalling or during a setup process (e.g. NG-SETUP)).
  • NSF NAS Node Selection Function
  • the gNB 604 may then report 628 to the core network 606 that the UE 602 is located within the STA. In this manner, the core network 606 is aware of the STA in which the UE 602 is located. When leaving the STA, a UE 602 may be required to send STA update messages to the core network 606. That is, when the UE 602 detects that it is exiting the STA (i.e. approaching the end of a coverage area of the cells of the STA, or entering a new STA) the UE 602 transmits an STA updated message to the core network 606.
  • the UE 602 may, detect that it has entered a new STA, for example by reading an STA identifier from a signalling information broadcast from a new gNB in a new STA. The UE 602 then transmits an STA update message to the core network (e.g. via the gNB 604 or via the new gNB whose coverage area the UE 602 has entered). In this manner, the core network 606 is kept informed when the UE moves to a new STA, such that the core network 606 is aware of the location of the UE 602 at the STA level. In this way, the core network 606 can, for example, instruct the UE 602 to release network services over a particular access method (e.g.
  • FIG. 7 illustrates a flowchart showing an example method for a base station (gNB) according to an example of the disclosure.
  • the example method 700 includes step S710 of receiving, from a core network part, an identifier for a secondary tracking area associated with a first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the infrastructure equipment is associated.
  • the first coverage area may be a portion or subdivision of a communications cell, or a communications cell.
  • the secondary tracking area may be a portion or subdivision of a communications cell, a communications cell, a plurality of communication cells, or a plurality of portions/subdivisions of a plurality of communication cells.
  • a coverage area (and by extension an STA) may in some examples be a coverage area provided by a distributed unit, a vehicle-to-everything (V2X) zone, a range of GNSS locations, or a specific range of locations determined based on ranging signals and/or WLAN signals confined within an area or a specific beam coverage area.
  • V2X vehicle-to-everything
  • the method further includes step S720 of transmitting, to the wireless communications device, the identifier for the secondary tracking area.
  • a secondary tracking area may be defined which is distinct from a tracking area, and which allows for finer granularity in determining the location of a wireless communications device.
  • transmitting the identifier for the secondary tracking area comprises: broadcasting, for receipt by the wireless communications device, system information including the identifier for the secondary tracking area.
  • the wireless communications device can be informed of the STA identifier without the need for additional signalling to the wireless communications device.
  • the method further includes broadcasting, for receipt by the wireless communications device: an identifier for the one or more tracking areas with which the secondary tracking area is associated, wherein the first coverage area is associated with the one or more tracking areas; and/or access information for the first coverage area.
  • a wireless communications device may be provided with both a tracking area and a secondary tracking area identifier, allowing for control based on both coarse and fine knowledge of the location of the wireless communications device, or other information which may be used to limit a wireless communications device’s activities.
  • the method may additionally include the steps of: receiving, from the wireless communication device, a registration request message; forwarding the registration request message to the core network part; receiving, from the core network part, a list of permitted secondary tracking areas for the communications device; and forwarding, to the communications device, the list of permitted secondary tracking areas for the communications device.
  • a wireless communications device may be provided with a list of permitted secondary tracking areas when it does not already possess one. This may form part of a NAS registration procedure.
  • the infrastructure equipment does not examine the messages to and from the wireless communication device and the core network part, such that this registration process is transparent to the infrastructure equipment.
  • the method may, in some examples, include receiving, from the wireless communications device, a message reporting that the wireless communications device is connected within the secondary tracking area; based on the wireless communications device and the secondary tracking area, select an access and mobility management function, AMF, for the wireless communication device.
  • AMF access and mobility management function
  • the access, or permitted functionality of the wireless communications device may be set based on the wireless communication device being located within the secondary tracking area. Accordingly, device access/functionality may be limited based on location at a finer scale than tracking areas, without using cell identifiers.
  • Selecting the AMF for the wireless communication device may comprise: selecting an AMF that supports fixed wireless access, FWA, for the wireless communications device. As such, FWA devices may be restricted to a comparatively small geographical area, such as indoors.
  • the method may further include: receiving, from the wireless communications device, a message reporting that the wireless communications device is connected within the secondary tracking area, and transmitting, to the core network part, the message reporting that the wireless communications device is connected within the secondary tracking area, or an indication that the wireless communications device is connected within the secondary tracking area.
  • the core network may be informed that a wireless communications device is located within the STA. This process may be transparent to the infrastructure equipment where the infrastructure equipment forwards the message received from the wireless communications device, or the infrastructure equipment may create and transmit a separate indication to the core network part.
  • the method may include the steps of: receiving an update message from the wireless communications device indicating that the wireless communications device has left the secondary tracking area, and transmitting, to the core network part, an indication that the wireless communications device has left the secondary tracking area.
  • the core network may be kept informed on any changes to the wireless communications device’s location at an STA level.
  • the method may include the step of transmitting a paging message to a plurality of wireless communications devices within the secondary tracking area, the plurality of wireless communications devices including the wireless communication device.
  • all wireless communications devices (UEs) within the STA may be paged in accordance with a paging procedure. Paging signaling load within the core network is reduced in this example, as paging messages are sent to fewer base stations due to the location of a wireless communications device being known more precisely.
  • the method may, in some examples, include determining one or more parameters defining restrictions to the access of the wireless communications device, wherein the restrictions are based on the secondary tracking area.
  • the parameters define that the infrastructure equipment is not to initiate handover of the wireless communications device to another infrastructure equipment that is outside of the secondary tracking area (such as with WWC), and/or the may parameters define that the wireless communications device is to terminate its usage of a particular service upon leaving the secondary tracking area (such as with ATSSS). Therefore, advanced functionalities may be implemented in the network as a result of the use of an STA and its associated STA identifier, allowing for fine-grained knowledge of the location of a wireless communications device.
  • FIG. 8 illustrates a flowchart showing an example method for a terminal device (UE) according to an example of the disclosure.
  • the example method 800 includes step S810 of obtaining, based on transmitted information received from the infrastructure equipment, an identifier for a secondary tracking area associated with a first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the infrastructure equipment is associated.
  • the first coverage area may be a portion or subdivision of a communications cell, or a communications cell.
  • the secondary tracking area may be a portion or subdivision of a communications cell, a communications cell, a plurality of communication cells, or a plurality of portions/subdivisions of a plurality of communication cells.
  • a coverage area (and by extension an STA) may in some examples be a coverage area provided by a distributed unit, a vehicle-to-everything (V2X) zone, a range of GNSS locations, or a specific range of locations determined based on ranging signals and/or WLAN signals confined within an area or a specific beam coverage area.
  • V2X vehicle-to-everything
  • the method 800 further includes a step S820 of determining, based on the identifier for the secondary tracking area associated with the first coverage area, whether the communications device is permitted access to the secondary tracking area.
  • the method 800 includes the step S830 of based on the determination of whether the communications device is permitted access to the secondary tracking area, selectively camping on the first coverage area via the infrastructure equipment. Accordingly, a secondary tracking area may be defined which is distinct from a tracking area, and which allows for finer granularity in determining the location of a wireless communications device.
  • obtaining the identifier for the secondary tracking area may comprise receiving, from the infrastructure equipment, the identifier for the secondary tracking area.
  • the identifier for the secondary tracking area associated with the first coverage area is included in a system information broadcast. As such, the wireless communications device may be informed of the STA identifier without requiring additional signalling.
  • determining whether the wireless communications device is permitted access to the secondary tracking area may comprise determining whether the secondary tracking area is included within a list of permitted secondary tracking areas. As such, a wireless communications device may readily determine whether it is permitted to access the STA.
  • determining whether the wireless communications device is permitted access to the secondary tracking area further comprises: based on determining that the wireless communications device does not include the list of permitted secondary tracking areas, transmitting a registration request message to the infrastructure equipment; and receiving from the infrastructure equipment, the list of permitted secondary tracking areas for the wireless communications device.
  • a wireless communications device may be provided with a list of permitted secondary tracking areas when it does not already possess one. This may form part of a NAS registration procedure.
  • the method may further include transmitting, to the infrastructure equipment, a message indicating that the wireless communications device is connected to the secondary tracking area.
  • the access, or permitted functionality of the wireless communications device may be set based on the wireless communication device being located within the secondary tracking area (e.g. by the infrastructure equipment selecting an appropriate AMF). Accordingly, device access/functionality may be limited based on location at a finer scale than tracking areas, without using cell identifiers.
  • the method may, in some examples, further include determining that the wireless communication device is leaving the secondary tracking area; and initiating a secondary tracking area update procedure.
  • the core network may be kept informed on any changes to the wireless communications device’s location at an STA level.
  • the method further comprises decode a paging message from the infrastructure equipment.
  • a wireless communication device may read paging messages transmitted to wireless communications devices connected within the STA, which can reduce paging load in the network, and reduce the number of paging messages that must be decoded.
  • the method further includes the steps of: receiving, from the infrastructure equipment, a system information broadcast, wherein the system information broadcast comprises an identifier for the first coverage area and an identifier for a tracking area associated with the first coverage area, wherein the tracking area includes a two or more communication cells, and wherein the two or more communication cells includes the first coverage area; wherein obtaining the identifier for the secondary tracking area comprises: determining, based on the identifier for the first coverage area and the identifier for the tracking area associated with the first coverage area, the identifier for the secondary tracking area associated with the first coverage area, wherein the one or more coverage areas of the secondary tracking area are a subset of the two or more communication cells of the tracking area.
  • the wireless communications device may obtain the STA identifier even in cases when the STA identifier is not explicitly received from the infrastructure equipment (for example because the infrastructure equipment has not been adequately upgraded to provide the STA identifier).
  • the method may include the steps of determining that a second coverage area supports fixed wireless access, FWA, devices; and transmitting, to the first infrastructure equipment, an indication that the second coverage area supports FWA devices to the infrastructure equipment.
  • SON-ANR signalling may be employed to improve management of the network.
  • FIG. 9 illustrates flowchart showing an example method 900 for a core network part according to an example of the disclosure.
  • the method 900 includes a step S910 of receiving a definition of a secondary tracking area associated with a first coverage area, wherein the secondary tracking area comprises one or more coverage areas each associated with an infrastructure equipment, wherein each of the one or more coverage areas is associated with a particular infrastructure equipment of the plurality of infrastructure equipment, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which a first infrastructure equipment is associated.
  • the first coverage area may be a portion or subdivision of a communications cell, or a communications cell.
  • the secondary tracking area may be a portion or subdivision of a communications cell, a communications cell, a plurality of communication cells, or a plurality of portions/subdivisions of a plurality of communication cells.
  • a coverage area (and by extension an STA) may in some examples be a coverage area provided by a distributed unit, a vehicle-to-everything (V2X) zone, a range of GNSS locations, or a specific range of locations determined based on ranging signals and/or WLAN signals confined within an area or a specific beam coverage area.
  • V2X vehicle-to-everything
  • the method also includes a step S920 of transmitting an identifier for the secondary tracking area to the first infrastructure equipment.
  • a secondary tracking area may be defined which is distinct from a tracking area, and which allows for finer granularity in determining the location of a wireless communications device.
  • the method further includes determining a list of permitted secondary tracking areas for a first wireless communications device; and transmitting the list of permitted secondary tracking areas to the first infrastructure equipment.
  • a wireless communications device may be provided with a list of permitted secondary tracking areas when it does not already possess one.
  • the method may further include receiving, from the first infrastructure equipment, an indication that a first wireless communications device is connected within the secondary tracking area.
  • the core network may be made aware of the location of the wireless communications device at finer granularity than using traditional tracking areas.
  • the method may further include receiving, from the first infrastructure equipment, a registration request for a first wireless communication device; and in response to the registration request, transmitting, to the first infrastructure equipment, a registration acceptance message for the first wireless communication device, wherein the registration acceptance message includes a list of permitted secondary tracking areas for the first wireless communications device.
  • a wireless communications device may be provided with a list of permitted secondary tracking areas when it does not already possess one. This may form part of a NAS registration procedure.
  • the infrastructure equipment does not examine the messages to and from the wireless communication device and the core network part, such that this registration process is transparent to the infrastructure equipment.
  • the method includes transmitting a paging message to each infrastructure equipment associated with the one or more coverage areas within the secondary tracking area.
  • all wireless communications devices (UEs) within the STA may be paged in accordance with a paging procedure.
  • Paging signaling load within the core network is reduced in this example, as paging messages are sent to fewer base stations due to the location of a wireless communications device being known more precisely.
  • An infrastructure equipment associated with a first coverage area in a wireless communications network configured to transmit data to and/or receive data from a wireless communications device within the first coverage area, and to transmit the data to or receive the data from a core network part of the wireless communications network
  • the infrastructure equipment comprising: a receiver configured to receive radio signals transmitted by the wireless communications device via a wireless access interface, a transmitter configured to transmit radio signals to the wireless communications device via the wireless access interface, and a controller configured to control the transmitter and the receiver to transmit data to or receive data from the wireless communications device and to transmit the data to or receive the data from the core network part via an interface with the core network, wherein the controller is configured with the receiver and transmitter to: receive, from the core network part, an identifier for a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the
  • transmitting the identifier for the secondary tracking area comprises: broadcasting, for receipt by the wireless communications device, system information including the identifier for the secondary tracking area.
  • infrastructure equipment is further configured to : receive, from the wireless communication device, a registration request message; forward the registration request message to the core network part; receive, from the core network part, a list of permitted secondary tracking areas for the communications device; forward, to the communications device, the list of permitted secondary tracking areas for the communications device.
  • infrastructure equipment is further configured to: receive, from the wireless communications device, a message reporting that the wireless communications device is connected within the secondary tracking area; based on the wireless communications device and the secondary tracking area, select an access and mobility management function, AMF, for the wireless communication device.
  • AMF access and mobility management function
  • selecting the AMF for the wireless communication device comprises: selecting an AMF that supports a multi-access protocol data unit, MA-PDll, session for the wireless communications device.
  • selecting the AMF for the wireless communication device comprises: selecting an AMF that supports fixed wireless access, FWA, for the wireless communications device.
  • infrastructure equipment is further configured to: receive, from the wireless communications device, a message reporting that the wireless communications device is connected within the secondary tracking area, and transmitting, to the core network part, the message reporting that the wireless communications device is connected within the secondary tracking area, or an indication that the wireless communications device is connected within the secondary tracking area.
  • infrastructure equipment is further configured to: receive an update message from the wireless communications device indicating that the wireless communications device has left the secondary tracking area, and transmit, to the core network part, an indication that the wireless communications device has left the secondary tracking area.
  • infrastructure equipment according to any of clauses 1-9, wherein the infrastructure equipment is further configured to: transmit a paging message to a plurality of wireless communications devices within the secondary tracking area, the plurality of wireless communications devices including the wireless communication device.
  • infrastructure equipment is further configured to: determine one or more parameters defining restrictions to the access of the wireless communications device, wherein the restrictions are based on the secondary tracking area.
  • the infrastructure equipment according to clause 11 wherein the parameters define that the infrastructure equipment is not to initiate handover of the wireless communications device to another infrastructure equipment that is outside of the secondary tracking area. 13. The infrastructure equipment according to clause 11 or 12, wherein the parameters define that the wireless communications device is to terminate its usage of a particular service upon leaving the secondary tracking area.
  • the first coverage area is: a subdivision of a first communication cell; or a first communication cell.
  • the secondary tracking area is: a subdivision of one or more communication cells; a communication cell; a plurality of communication cells.
  • a method for an infrastructure equipment associated with a first coverage area in a wireless communications network comprising: receiving, from a core network part, an identifier for a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the infrastructure equipment is associated; and transmitting, to a wireless communications device, the identifier for the secondary tracking area.
  • Circuitry for an infrastructure equipment associated with a first coverage area in a wireless communications network comprising: receiver circuitry configured to receive radio signals transmitted by the wireless communications device via a wireless access interface, transmitter circuitry configured to transmit radio signals to the wireless communications device via the wireless access interface, and controller circuitry configured to control the transmitter circuitry and the receiver circuitry to transmit data to or receive data from the wireless communications device and to transmit the data to or receive the data from the core network part via an interface with the core network, wherein the controller circuitry is configured with the receiver circuitry and transmitter circuitry to: receive, from the core network part, an identifier for a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the infrastructure equipment is associated; and transmit, to the wireless communications device, the identifier for the secondary tracking area.
  • a wireless communications device configured to transmit radio signals to and/or receive radio signals in a first coverage area from an infrastructure equipment communicable with a core network part, the wireless communications device comprising: a receiver configured to receive radio signals transmitted by the infrastructure equipment via a wireless access interface, a transmitter configured to transmit radio signals to the infrastructure equipment via the wireless access interface, and a controller configured to control the transmitter and the receiver to transmit data to or receive data from the wireless communications network via the infrastructure equipment, wherein the controller is configured with the receiver and transmitter to: obtain, based on transmitted information received from the infrastructure equipment, an identifier for a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the infrastructure equipment is associated; determine, based on the identifier for the secondary tracking area associated with the first coverage area, whether the communications device is permitted access to the secondary tracking area; and based
  • obtaining the identifier for the secondary tracking area comprises: receiving, from the infrastructure equipment, the identifier for the secondary tracking area.
  • determining whether the wireless communications device is permitted access to the secondary tracking area comprises: determining whether the secondary tracking area is included within a list of permitted secondary tracking areas.
  • determining whether the wireless communications device is permitted access to the secondary tracking area further comprises: based on determining that the wireless communications device does not include the list of permitted secondary tracking areas, transmitting a registration request message to the infrastructure equipment; and receiving from the infrastructure equipment, the list of permitted secondary tracking areas for the wireless communications device.
  • wireless communications device according to any of clauses 18-22, wherein the wireless communications device is further configured to: transmit, to the infrastructure equipment, a message indicating that the wireless communications device is connected to the secondary tracking area.
  • the wireless communications device according to any of clauses 18-23, wherein the wireless communications is further configured to: determine that the wireless communication device is leaving the secondary tracking area; and initiate a secondary tracking area update procedure.
  • the wireless communications device is further configured to: receive, from the infrastructure equipment, a system information broadcast, wherein the system information broadcast comprises an identifier for the first coverage area and an identifier for a tracking area associated with the first coverage area, wherein the tracking area includes a two or more communication cells, and wherein the two or more communication cells includes the first coverage area; wherein obtaining the identifier for the secondary tracking area comprises: determining, based on the identifier for the first coverage area and the identifier for the tracking area associated with the first coverage area, the identifier for the secondary tracking area associated with the first coverage area, wherein the one or more coverage areas of the secondary tracking area are a subset of the two or more communication cells of the tracking area.
  • a method for a wireless communications device comprising: obtaining, based on transmitted information received from the infrastructure equipment, an identifier for a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the infrastructure equipment is associated; determining, based on the identifier for the secondary tracking area associated with the first coverage area, whether the communications device is permitted access to the secondary tracking area; and based on the determination of whether the communications device is permitted access to the secondary tracking area, selectively camping on the first coverage area via the infrastructure equipment.
  • Circuitry for a wireless communications device comprising: receiver circuitry configured to receive radio signals transmitted by the infrastructure equipment via a wireless access interface, transmitter circuitry configured to transmit radio signals to the infrastructure equipment via the wireless access interface, and controller circuitry configured to control the transmitter circuitry and the receiver circuitry to transmit data to or receive data from the wireless communications network via the infrastructure equipment, wherein the controller circuitry is configured with the receiver circuitry and transmitter circuitry to: obtain, based on transmitted information received from the infrastructure equipment, an identifier for a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the infrastructure equipment is associated; determine, based on the identifier for the secondary tracking area associated with the first coverage area, whether the communications device is permitted access to the secondary tracking area; and based on the determination of whether the communications device is permitted access to the secondary tracking area
  • a core network part of a wireless communications network configured to transmit signals to and/or receive signals from a plurality of infrastructure equipment in the wireless communications network
  • the core network part comprising: a receiver configured to receive signals transmitted by a first infrastructure equipment associated with a first coverage area via an access interface, a transmitter configured to transmit signals to the first infrastructure equipment via the access interface, and a controller configured to control the transmitter and the receiver to transmit data to or receive data from the first infrastructure equipment, wherein the controller is configured with the receiver and transmitter to: receive a definition of a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas each associated with an infrastructure equipment, wherein each of the one or more coverage areas is associated with a particular infrastructure equipment of the plurality of infrastructure equipment, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the first infrastructure equipment is associated; and transmit an identifier for the secondary tracking area to
  • the core network part according to any of clauses 32-33, wherein the core network part is further configured to: receive, from the first infrastructure equipment, an indication that a first wireless communications device is connected within the secondary tracking area.
  • the core network part is further configured to: receive, from the first infrastructure equipment, a registration request for a first wireless communication device; and in response to the registration request, transmit, to the first infrastructure equipment, a registration acceptance message for the first wireless communication device, wherein the registration acceptance message includes a list of permitted secondary tracking areas for the first wireless communications device.
  • a method for a core network part of a wireless communications network comprising: receiving a definition of a secondary tracking area associated with a first coverage area, wherein the secondary tracking area comprises one or more coverage areas each associated with an infrastructure equipment, wherein each of the one or more coverage areas is associated with a particular infrastructure equipment of the plurality of infrastructure equipment, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which a first infrastructure equipment is associated; and transmitting an identifier for the secondary tracking area to the first infrastructure equipment.
  • Circuitry for a core network part of a wireless communications network configured to transmit signals to and/or receive signals from a plurality of infrastructure equipment in the wireless communications network
  • the circuitry comprising: receiver circuitry configured to receive signals transmitted by a first infrastructure equipment associated with a first coverage area via an access interface, transmitter circuitry configured to transmit signals to the first infrastructure equipment via the access interface, and controller circuitry configured to control the transmitter circuitry and the receiver circuitry to transmit data to or receive data from the first infrastructure equipment, wherein the controller circuitry is configured with the receiver circuitry and transmitter circuitry to: receive a definition of a secondary tracking area associated with the first coverage area, wherein the secondary tracking area comprises one or more coverage areas each associated with an infrastructure equipment, wherein each of the one or more coverage areas is associated with a particular infrastructure equipment of the plurality of infrastructure equipment, wherein the one or more coverage areas of the secondary tracking area are a subset of coverage areas associated with one or more tracking areas, and wherein the one or more coverage areas comprise the first coverage area with which the first infrastructure equipment is associated
  • a system comprising two or more of: the infrastructure equipment according to any of clauses 1-15; the wireless communications device according to any of clauses 18-29; and the core network part according to any of clauses 32-38.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des dispositifs de communication, un équipement d'infrastructure, des parties de réseau central et des procédés pour la transmission de données par un dispositif de communication, un équipement d'infrastructure et une partie de réseau central dans un réseau de communication sans fil. Un dispositif de communication sans fil obtient un identifiant pour une zone de suivi secondaire associée à la première zone de couverture, la zone de suivi secondaire étant une subdivision d'une ou de plusieurs zones de suivi ; détermine, sur la base de l'identifiant pour la zone de suivi secondaire, si le dispositif de communication est autorisé à accéder à la zone de suivi secondaire ; et sur la base de la détermination du fait que le dispositif de communication est autorisé à accéder à la zone de suivi secondaire, reste sélectivement sur la première zone de couverture par l'intermédiaire de l'équipement d'infrastructure.
PCT/EP2022/083492 2021-12-06 2022-11-28 Restriction d'accès basée sur une zone de suivi secondaire WO2023104573A1 (fr)

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Citations (2)

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WO2020224345A1 (fr) * 2019-05-06 2020-11-12 腾讯科技（深圳）有限公司 Procédé de contrôle d'accès à des réseaux, support lisible par ordinateur et dispositif électronique
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