WO2018203258A1 - Cause d'établissement de tranchage et informations de tranchage demandées - Google Patents

Cause d'établissement de tranchage et informations de tranchage demandées Download PDF

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Publication number
WO2018203258A1
WO2018203258A1 PCT/IB2018/053049 IB2018053049W WO2018203258A1 WO 2018203258 A1 WO2018203258 A1 WO 2018203258A1 IB 2018053049 W IB2018053049 W IB 2018053049W WO 2018203258 A1 WO2018203258 A1 WO 2018203258A1
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WO
WIPO (PCT)
Prior art keywords
message
assistance information
network slice
selection assistance
slice selection
Prior art date
Application number
PCT/IB2018/053049
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English (en)
Inventor
Tero Henttonen
Johanna K. PEKONEN
Malgorzata Tomala
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Nokia Technologies Oy
Nokia Usa Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy, Nokia Usa Inc. filed Critical Nokia Technologies Oy
Publication of WO2018203258A1 publication Critical patent/WO2018203258A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure

Definitions

  • This disclosure relates to network slicing in a 3GPP NR/5G system.
  • Network slicing is introduced to 3GPP NR/5G system as an E2E service feature.
  • a realization network slicing is denoted as a Network Slice Instance (NSI). It is defined as "a set of network functions, and resources to run these network functions, forming a 'complete instantiated logical network' to meet certain network characteristics required by Service Instance(s)”.
  • NSI Network Slice Instance
  • the network slice is a complete logical network (providing Telecommunication Services and Network Capabilities) including AN and CN.
  • a UE For a "Service Request", a UE is registered or updated, and has a valid temporary ID, which is sufficient in the RAN to route the request to the serving Common CP NF. It is assumed that the slice configuration does not change within the UE's registration areas.
  • the cells may be part of different network slices and a cell can belong to multiple network slice instances.
  • the current assumption in 3GPP is that the cells which are part of the same registration area (RA) would be part of the same set of network slices, identified by Network Slice Selection Assistance Information (NSSAI), which is a set of zero or more S-NSSAI (Single NSSAI).
  • NSSAI Network Slice Selection Assistance Information
  • a UE does "attach" to a network, it is then provided with NSSAI, consisting of set of S-NSSAI (Allowed NSSAI or Configured NSSAI), which tells the UE which slices are supported in the current tracking area.
  • the NSSAI could be also received at every Tracking Area Update (TAU), in case there is a change in the network support of slices. In that way, the UE always would know within its serving registration area, when entering a new cell, which of its assigned network slices would be available in the new cell.
  • TAU Tracking Area Update
  • the NSSAI information Configured-NSSAI or Allowed-NSSAI, provided as part of the Tracking Area Update procedure and during the Initial Attach to the UE from the network, contains the list of network slices applicable for the current tracking area.
  • the UE has to indicate the full set of Configured-NSSAI or Allowed NSSAI in each and every connection request or periodic TAU, the size of the messages may grow large, and, in addition, the information may not be necessary for a given gNB.
  • the reason why the UE has been assumed always to indicate the full set is that it cannot know which information the network needs - thus, the only solution has been to signal the full NSSAI information to the gNB to be further selected depending on AMF(s) capabilities.
  • the signaling is redundant, that is, it requires negotiation with CN at each TAU, and, in terms of content, the signaling is redundant and unsecured, that is, the approach hides the intention of conveying full slicing information.
  • the network may not always require the slicing information, and may not be aware of the UE's support of slicing. This is because UE capabilities are only retrieved by radio access node from UE or AMF much later after the connection setup, so the network always has to be able to accept slicing relevant connections blindly and to cope with the slicing information sent further by UE.
  • the network may face processing and load issues with undetermined UE slicing needs at the point of requesting connection. Further, not all UEs may even have slicing, in which case rules are needed to allow the network to distinguish whether a particular UE: 1) does not support slicing OR 2) does not have any configured Allowed NSSAI.
  • TAU can be delivered via either RRC connection setup, when moving from IDLE to CONNECTED, or via direct NAS message delivery. In either case, the UE knows nothing about the slicing handling of the gNB.
  • NAS upper layers
  • the UE signals a single DCN-ID index to eNB based on its NAS information, which is then interpreted by the eNB.
  • This index can represent almost whatever the network decides, as long as it has been provisioned to the UE NAS.
  • gNB should be understood to mean “network node”.
  • the term “gNB” is used to denote a network node in 5G.
  • the present invention as described below, is not limited to 5G, but may be applicable to other generations yet to be developed.
  • gNB should be understood more broadly as a network node.
  • a method for a user equipment comprises sending an initial connection request message to a gNB in a non-slice-dedicated cell, said initial connection request message including a UE identifier and an establishment cause value determining slicing purpose; receiving a reply message from the gNB (that is, connection setup); and sending a setup complete message to the gNB, said setup complete message including network slice selection assistance information.
  • a method for a gNB comprises receiving an initial connection request message from a UE in a non-slice-dedicated cell, said initial connection request message including a UE identifier and an establishment cause value determining slicing purpose; determining UE slicing capability; utilizing admission control according to the UE slicing capability; sending a connection setup message to the UE; and receiving a setup complete message from the UE, said setup complete message including network slice selection assistance information.
  • a method for a user equipment comprises sending an initial connection request message to a gNB in a slice-dedicated cell, said initial connection request message including a UE identifier and an establishment cause value determining slicing purpose; receiving a connection setup message from the gNB with cell with slice specific restrictions; and sending a setup complete message to the gNB.
  • a method for a gNB comprises receiving an initial connection request message from a UE in a slice-dedicated cell, said initial connection request message including a UE identifier and an establishment cause value determining slicing purpose; determining whether the UE is accessing the slice-dedicated cell according to a dedicated slice; determining UE access to the slice-dedicated cell by way of an admission control using the establishment cause value determining slicing purpose; sending a connection setup message to the UE; and receiving a setup complete message from the UE.
  • a method for a user equipment comprises, after an RRC connection has been established with a gNB in a non-slice-dedicated cell, sending a new connection request message to the gNB, said new connection request message including a UE identifier and an establishment cause value determining slicing purpose; receiving a connection setup message from the gNB updating the RRC connection; and sending a setup complete message to the gNB, said setup complete message including updated network slice selection assistance information.
  • a method for a gNB comprises, after an RRC connection has been established with a UE in a non-slice-dedicated cell, receiving a new connection request message from the UE, said new connection request message including a UE identifier and an establishment cause value determining slicing purpose; determining from the UE identifier that the UE is requesting additional slices or has updated its subscription; deciding whether to accept new service for the UE; sending a connection setup message to the UE; and receiving a setup complete message from the UE, said setup complete message including updated network slice selection assistance information.
  • a method for a user equipment comprises sending an initial connection request message to a source gNB, said initial connection request message including a UE temporary identifier; receiving a connection setup message from the source gNB, said connection setup message indicating slice information to be added to radio resource control; and sending a setup complete message to the source gNB, said setup complete message including network slice selection assistance information in response to said connection setup message.
  • a method for a gNB comprises receiving an initial connection request message from a UE, said initial connection request message including a UE temporary identifier; sending a connection setup message to the UE, said connection setup message indicating slice information to be added to radio resource control; receiving a setup complete message from the UE, said setup complete message including network slice selection assistance information in response to said connection setup message; and utilizing the network slice selection assistance information for connection to an access and mobility management function.
  • a method for a user equipment comprises sending an initial connection request message to a source gNB, said initial connection request message including a UE temporary identifier; receiving a connection setup message from the source gNB, said connection setup message indicating that no network slice selection assistance information is to be provided in response; sending a setup complete message to the source gNB, said setup complete message including no network slice selection assistance information in response to said connection setup message; receiving an access stratum security activation message from the source gNB; and sending the network slice selection assistance information to the source gNB.
  • a method for a gNB comprises receiving an initial connection request message from a UE, said initial connection request message including a UE temporary identifier; sending a connection setup message to the UE, said connection setup message indicating that no network slice selection assistance information is to be provided in response; receiving a setup complete message from the UE, said setup complete message including no network slice selection assistance information in response to said connection setup message; sending an access stratum security activation message to the UE; receiving the network slice selection assistance information from the UE; and utilizing the network slice selection assistance information for connection to an access and mobility management function.
  • a method for a gNB comprises, after receiving network slice selection assistance information provisioned by the upper layer, sending an RRC message with differentiated content of said connection request message; including corresponding network slice selection assistance information in said connection complete message according to the differentiated content by said connection request message.
  • a method for a user equipment comprises, after being connected to a source gNB with network slice selection assistance information requested from the source gNB, sending an RRC message with a tracking area update (TAU) including the requested network slice selection assistance information to the source gNB; and receiving updated network slice selection assistance information from the source gNB.
  • TAU tracking area update
  • a method for a source gNB comprises, after being connected to a UE having previously requested network slice selection assistance information, receiving an RRC message with a tracking area update (TAU) including the previously requested network slice selection assistance information from the UE; forwarding the tracking area update to an access and mobility management function (AMF) based on the network slice selection assistance information; receiving updated network slice selection assistance information from the AMF; and forwarding the updated network slice selection assistance information to the UE.
  • TAU tracking area update
  • AMF access and mobility management function
  • a method for an access and mobility management function comprises receiving a tracking area update from a source gNB based on network slice selection assistance information provided to a UE; and sending updated network slice selection assistance information to the source gNB.
  • a method for a user equipment comprises connecting to a source gNB with network slice selection assistance information requested from the source gNB; receiving an RRC reconfiguration message with a handover command from the source gNB ; and connecting to a target gNB using information in the RRC reconfiguration message.
  • a method for a source gNB comprises receiving a connection to a UE, said UE having previously requested network slice selection assistance information; sending a handover request to a target gNB with network slice selection assistance information from the UE; receiving a handover command including updates to network slice selection assistance information requested in RRC messages; and sending an RRC reconfiguration message with a handover command to the UE.
  • a method for a target gNB comprises receiving a handover request from a source gNB with network slice selection assistance information from a UE; sending a handover command including updates to network slice selection assistance information requested in RRC messages to the source gNB; connecting to the UE; and utilizing the network slice selection assistance information for connection to an access and mobility management function.
  • Figure 1 illustrates sending an initial connection request with "slicing" establishment cause in a non-slice-dedicated cell.
  • Figure 2 illustrates sending an initial connection request with "slicing" establishment cause in a slice-dedicated cell.
  • Figure 3 illustrates sending a new slicing service request via RRC setup request plus slicing establishment cause.
  • Figure 4 illustrates sending initial connection request - gNB indicates which NSSAI information to use.
  • Figure 5 illustrates sending initial connection request - gNB indicates no NSSAI information should be signaled in connection establishment procedure.
  • Figure 6 illustrates sending TAU based on gNB configuration.
  • Figure 7 illustrates handover, updating what is requested from the UE as NSSAI information.
  • Figure 8 shows a simplified block diagram of certain apparatus according to various exemplary embodiments of the present invention.
  • a single establishment cause (that is, reason indicated in a query message for connection or service establishment from a UE to the network) be dedicated to a UE indicating that slicing information will be provided in further messages.
  • This may be either part of all establishment causes, or an additional indication that the current establishment cause is also related to slicing.
  • This allows the network to differentiate the UEs that support slicing and those that do not, such as for doing different admission control algorithms for each class of UEs, in lieu of barring, which may not always be used, or for setting up the connection with different parameters or applying specific treatment of connection that expose slicing information.
  • the slicing establishment cause could also be used in case a UE also requests setup of a new slice or has updated slicing information, for example, due to updated slicing subscription that the UE just bought via the connection that was setup, that is, when doing a service request when the RRC connection is already setup. This would allow the same message to be reused with same semantics, even when the RRC connection is already up and running.
  • this indicator would also immediately tell that the UEs are expected to have the slice specific to the cell, and are not, for example, emergency calls, which may or may not be allowed in such a cell.
  • the UE explicitly indicates an establishment cause for "slicing", and, in a subsequent message, indicates more details about the exact nature of the slicing:
  • the UE indicates its NSSAI information in the next message to the network
  • the UE does not indicate further slicing information to implicitly indicate that it only supports the cell restrictions (for example, only the dedicated NSSAI that the cell supports);
  • the UE uses the establishment cause to indicate that it has updated slicing information available:
  • the updated information consists of a service request for a new S-NSSAI
  • the establishment cause indicates that the UE subscription has changed with different NSSAI information gNB side:
  • a gNB receives a value from a UE that indicates NSSAI information exists for the UE:
  • the gNB uses the information to decide whether to accept the UE request
  • the gNB uses a different admission control mechanism for UEs that support slicing compared to UEs that do not support slicing;
  • the gNB takes action to request further information from the UE NSSAI in a later message (such as, message completing connection setup or later message for UL data transfer);
  • the gNB receives a value from the UE in a connection request to determine that the UE requests updates to its existing RRC connection;
  • the gNB uses the information to request updated subscription information for the UE from the CN;
  • the gNB handles the message as a request to setup new slices for the UE based on further information received from subsequent message(s) from the UE.
  • the gNB is aware of the UE support for network slicing immediately at connection request;
  • the gNB may utilize the information on UE slicing support to utilize an appropriate admission control scheme for the UE, for example, to allow a more dynamic way of access barring than SI (System Information) changes;
  • SI System Information
  • the same RRC setup-message can be reused when requesting further network services via slicing, even if the RRC connection is already ongoing.
  • the network can use the UE identifier and the establishment cause to realize that the UE is not requesting a new connection but an update to its existing connection.
  • a handover command such as an RRCConnectionReconfiguration including mobility Controllnfo
  • the gNB allows the gNB to have control over the slicing information sent from UE to NG-RAN, and can be used in every single case since it is included in the first message from the network to the UE, that is, before the UE actually sends the NSSAI information to the network.
  • the UE receives a request provisioning content of the slicing assistance information
  • the UE receives a request always to indicate full NSSAI information when sending messages that may contain NSSAI information;
  • the UE receives a request to indicate a subset of its currently configured NSSAI information when sending messages that may contain NSSAI information: o
  • the subset of NSSAI that UE indicates is explicitly or implicitly indicated by the gNB ;
  • the subset of NSSAI that UE indicates consists of a single entry that is chosen by UE;
  • the choice done is done at the NAS level
  • the choice is done at the AS level
  • the UE NSSAI information that the UE indicates is based on a subset of its currently configured or allowed NSSAI information in case of PDU session establishment;
  • the subset of NSSAI that UE indicates is based only on the NSSAI applicable for the current PLMN;
  • the UE NSSAI information that the UE indicates contains the Slice/Service Type (SST) field for each S-NSSAI in NSSAI; o In another related embodiment, the UE NSSAI information that the UE indicates contains the Slice Differentiator (SD) field for each S-NSSAI in NSSAI;
  • SST Slice/Service Type
  • SD Slice Differentiator
  • the UE receives a request not to indicate any NSSAI information when sending messages to establish connection:
  • the UE receives a request only to indicate whether the UE supports network slicing instead of any NSSAI information when sending messages that may contain NSSAI information;
  • the UE indicates NSSAI information in a message after security activation (for example, a UL Information Transfer);
  • the UE receives a request only to indicate NSSAI information when sending a message that contains a TAU/RAU;
  • the UE receives the request to indicate a subset of its currently configured or allowed NSSAI information in case of PDU session establishment; In another embodiment, the UE sets a subset of its currently configured NSSAI information when establishing RRC connection according to the content provisioned by the gNB:
  • the subset of NSSAI that UE indicates is explicitly or implicitly indicated to the gNB;
  • the subset consists of a combination of S-NSSAIs; o In another related embodiment, the subset consists of the UE's selected S-NSSAI(s); o In another related embodiment, the subset consists of a combination of SST fields of selected S-NSSAI(s);
  • the subset consists of a combination the SD fields of selected S-NSSAI(s).
  • requesting UE to decide which NSSAI to indicate:
  • ⁇ using the indication to request Slice/Service Type (SST) indication;
  • indicating whether a certain type of message such as TAU, RRC reconfiguration response, and resumption of RRC connection, requires sending NSSAI information
  • indicating omission of sending NSSAI information by the UE indicating omission of sending NSSAI information by the UE.
  • the UE always knows what to indicate since it is received before the message that UE uses to indicate the slicing information
  • the network Even if the network requests the UE not to indicate NSSAI information, it can request to know whether the UE supports network slicing;
  • a wireless network 1 is adapted for communication over a wireless link 11 with an apparatus, such as a mobile communication device, which is referred to as a UE 10, via a wireless network access node, such as a base station or relay station or remote radio head, and more specifically shown as a gNodeB 12.
  • the network 1 may include a network control element (NCE) 14, which serves as an access and mobility management function or entity (AMF or MME) and/or a serving gateway (S-GW) to a broader network, such as a public switched telephone/data network and/or the Internet.
  • NCE network control element
  • AMF or MME access and mobility management function or entity
  • S-GW serving gateway
  • the UE 10 includes a controller, such as a computer or a data processor (DP) 10A, a computer-readable memory medium embodied as a memory (MEM) 10B, which stores a program of computer instructions (PROG) IOC, and a suitable radio frequency (RF) transmitter and receiver 10D for bi-directional wireless communications with the gNodeB (gNB) 12 via one or more antennas.
  • the gNodeB 12 also includes a controller, such as a computer or a data processor (DP) 12A, a computer-readable memory medium embodied as a memory (MEM) 12B that stores a program of computer instructions (PROG) 12C, and a suitable RF transmitter and receiver 12D for communication with the UE 10 via one or more antennas.
  • DP computer or a data processor
  • PROG program of computer instructions
  • RF radio frequency
  • the eNodeB 12 is coupled via a data/control path 13 to the NCE 14.
  • the path 13 may be implemented as an SI interface when the network 1 is an LTE network.
  • the gNodeB 12 may also be coupled to another gNodeB via data/control path 15, which may be implemented as an X2 interface when the network 1 is an LTE network.
  • At least one of the PROGs IOC and 12C is assumed to include program instructions that, when executed by the associated DP, enable the device to operate in accordance with the exemplary embodiments of this invention as was detailed above with respect to Figures 1 to 7. That is, the exemplary embodiments of this invention may be implemented at least in part by computer software executable by the DP 10 A of the UE 10 and/or by the DP 12A of the eNodeB 12, or by hardware, or by a combination of software and hardware (and firmware).
  • the various embodiments of the UE 10 can include, but are not limited to, cellular telephones; personal digital assistants (PDAs) having wireless communication capabilities; portable computers having wireless communication capabilities; image capture devices, such as digital cameras, having wireless communication capabilities; gaming devices having wireless communication capabilities; music storage and playback appliances having wireless communication capabilities; and Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras, having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • the computer-readable MEMs 10B and 12B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor -based memory devices, flash memory, magnetic-memory devices and systems, optical-memory devices and systems, fixed memory and removable memory.
  • the DPs 10A and 12A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multicore processor architecture, as non-limiting examples.
  • the various DPs 10A, 12A may be implemented as one or more processors/chips, either or both of the UE 10 and the gNodeB 12 may include more than one transmitter and/or receiver 10D, 12D, and particularly the gNodeB 12 may have its antennas mounted remotely from the other components of the gNodeB 12, such as for example tower-mounted antennas.
  • the various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • While various aspects of the exemplary embodiments of this invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the integrated circuit, or circuits may comprise circuitry, as well as possibly firmware, for embodying at least one or more of a data processor or data processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry that are configurable so as to operate in accordance with the exemplary embodiments of this invention.

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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

Un procédé destiné à un équipement utilisateur consiste à envoyer un message de requête de connexion initiale à un gNB dans une cellule non dédiée en tranche, ledit message de requête de connexion initiale comprenant un identifiant d'UE et une valeur de cause d'établissement déterminant un but de tranchage; à recevoir un message d'établissement de connexion en provenance du gNB; et à envoyer un message d'achèvement d'établissement au gNB, ledit message d'achèvement d'établissement comprenant des informations d'aide à la sélection de tranche de réseau. Un procédé correspondant destiné à un gNB consiste à recevoir un message de requête de connexion initiale en provenance d'un UE dans une cellule non dédiée en tranche, ledit message de requête de connexion initiale comprenant un identifiant d'UE et une valeur de cause d'établissement déterminant un but de tranchage; déterminer la capacité de tranchage d'UE; utiliser une commande d'admission en fonction de la capacité de tranchage d'UE; envoyer un message d'établissement de connexion à l'UE; et recevoir un message d'achèvement d'établissement en provenance de l'UE, ledit message d'achèvement d'établissement comprenant des informations d'aide à la sélection de tranche de réseau.
PCT/IB2018/053049 2017-05-05 2018-05-02 Cause d'établissement de tranchage et informations de tranchage demandées WO2018203258A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN114554571A (zh) * 2018-11-15 2022-05-27 北京小米移动软件有限公司 网络切片的使用方法及装置
EP3883285A4 (fr) * 2018-11-15 2022-06-08 Beijing Xiaomi Mobile Software Co., Ltd. Procédé et dispositif d'utilisation de tranche de réseau
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