WO2009139674A1 - Réseau d'accès générique (gan) à femtocellules - Google Patents

Réseau d'accès générique (gan) à femtocellules Download PDF

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Publication number
WO2009139674A1
WO2009139674A1 PCT/SE2008/050551 SE2008050551W WO2009139674A1 WO 2009139674 A1 WO2009139674 A1 WO 2009139674A1 SE 2008050551 W SE2008050551 W SE 2008050551W WO 2009139674 A1 WO2009139674 A1 WO 2009139674A1
Authority
WO
WIPO (PCT)
Prior art keywords
message
gan
ganc
femto cell
downlink
Prior art date
Application number
PCT/SE2008/050551
Other languages
English (en)
Inventor
Jari Tapio Vikberg
Lukasz Jan Szpak
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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 Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/SE2008/050551 priority Critical patent/WO2009139674A1/fr
Publication of WO2009139674A1 publication Critical patent/WO2009139674A1/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
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to wireless telecommunication networks.
  • the invention is directed to a method and controller for utilizing a Generic Access Network (GAN) for communications between a core network node and a mobile station in a communication network having Femto cells.
  • GAN Generic Access Network
  • the Third Generation Partnership Project (3GPP) has standardized the Generic Access Network (GAN)-concept starting from 3GPP Release-6.
  • GAN Generic Access Network
  • UMA Unlicensed Mobile Access
  • FIG. 1 is a functional block diagram from 3GPP TS 43.318 illustrating an architecture of the GAN 10.
  • GAN is specified in the 3GPP TS 43.318 and TS 44.318.
  • a mobile station (MS) 11 connects through a WiFi access point (AP) in a generic IP access network 12.
  • GAN provides a new Radio Access Network (RAN), and the node corresponding to the GERAN Base Station Controller is called the Generic Access Network Controller (GANC) 13.
  • the GANC 13 includes a Security Gateway (SEGW) and connects to a GSM Core Network (CN) 14.
  • SEGW Security Gateway
  • CN GSM Core Network
  • the MS may be a dual-mode or tri-mode, dual-radio handset including for example both WiFi and 3GPP-macro radio support (GSM, WCDMA or both).
  • the MS connects to the WiFi AP utilizing the WiFi Radio.
  • the GAN standard defines for example how the MS can function in GAN mode and access the services provided by the GSM CN using the Up-interface 15 between the MS and the GANC.
  • the current GAN standard may be referred to as "2G-GAN” or "GSM- GAN” because the standard GSM A-interface and Gb-interface are utilized between the GANC and the CN.
  • Work is ongoing to standardize a "3G-GAN” or "WCDMA-GAN” solution.
  • the GANC will utilize standard WCDMA interfaces such as the lu-cs and the lu-ps interfaces to connect to the CN.
  • the resulting standard can be also called "Generic Access to Iu Interfaces" or "GAN-Iu”.
  • FIG. 2 is a protocol diagram illustrating a circuit-switched (CS) Domain Control Plane Architecture 20 related to the GAN solution and the Up-interface 15.
  • the GANC 13 uses normal A-interface signaling towards the Mobile Switching Center (MSC) 21.
  • the GANC interworks the related protocols, like the Base Station System Application Part (BSSAP) 22, towards the relevant GAN-protocols, such as Generic Access - Circuit Switched Resources (GA- CSR) 23, in both directions.
  • FIG. 3 is a functional block diagram of an architecture of a GSM-Femto access network.
  • the GSM-Femto solution provides small Femto cells for the end users by having small GSM radio base stations in, for example, the user's home premises.
  • the small radio base station is called a Femto Cell Customer Premises Equipment (CPE) 31.
  • the Femto Cell CPE connects to the network using the proprietary Fp and Abis-over-IP interfaces.
  • the node corresponding to the GERAN BSC is called a Femto BSC 32.
  • MSs do not require any changes because the standard GSM Um-interface is used between the MS and the Femto Cell CPE.
  • the MS connects to the Femto Cell CPE as normally in GERAN.
  • the Femto Cell CPE is then connected to the Femto BSC using the proprietary Fp and Abis-over-IP interfaces.
  • FIG. 4 is a protocol diagram illustrating a CS Domain Control Plane Architecture 40 related to the GSM-Femto solution.
  • the Femto BSC 32 uses normal A-interface signaling towards the MSC 21.
  • the Femto BSC interworks the related protocols, like BSSAP 22, towards the relevant GSM-protocols such as GSM Radio Resources (GSM RR) 41 in both directions.
  • GSM RR GSM Radio Resources
  • the present invention provides a method, GANC, and Femto Cell CPE for utilizing GAN communications between a core network node and a mobile station in a communication network having Femto cells.
  • the invention provides for relatively simple implementation in the GANC and/or Femto Cell CPE and avoids detailed procedures to identify specific information elements.
  • the invention In the downlink direction, the invention always provides the Femto Cell CPE with all the required information, even if new information is added to the signaling between the core network and the GANC.
  • the invention In the uplink direction, the invention always provides the GANC with all the required information, even if new information is added to the GSM RR signaling between the MS and the Femto Cell CPE.
  • the present invention is directed to a method of utilizing a GAN for communications between a core network node and an MS in a radio communication network having Femto cells.
  • the method includes the steps of receiving in a GANC 1 a downlink message sent from the core network node toward the MS; incorporating the entire downlink message in a GAN message; and sending the GAN message, including the incorporated downlink message, from the GANC to a Femto Cell Customer Premises Equipment, Femto Cell CPE.
  • the downlink message may be incorporated in a GAN message that is triggered by the receipt of the downlink message from the core network node.
  • the downlink message may be incorporated in a second GAN message that is sent in addition to the GAN message that is triggered by the receipt of the downlink message from the core network node.
  • the present invention is directed to a Generic Access Network Controller (GANC) for enabling GAN communications between a core network node and an MS in a radio communication network having Femto cells.
  • GANC Generic Access Network Controller
  • the GANC includes means for receiving a downlink message sent from the core network node toward the MS; means for incorporating the entire downlink message in a GAN message; and means for sending the G ⁇ N message, including the incorporated downlink message, from the GANC to a Femto Cell Customer Premises Equipment, Femto Cell CPE.
  • the present invention is directed to a method of utilizing a GAN for communications between an MS and a core network node in a radio communication network having Femto cells, wherein a given interface is utilized between a GANC and the core network node.
  • the method includes the steps of receiving in a Femto Cell CPE 1 a message sent from the MS toward the core network node; incorporating in a GAN message, an entire uplink message utilized with the given interface between the GANC and the core network node; and sending the GAN message, including the incorporated uplink message, from the Femto Cell CPE to the GANC.
  • the uplink message may be incorporated in a GAN message that is triggered by the receipt of the message from the MS.
  • the uplink message may be incorporated in a second GAN message that is sent in addition to the GAN message that is triggered by the receipt of the message from the MS.
  • the present invention is directed to a Femto Cell Customer Premises Equipment (Femto Cell CPE) for utilizing a GAN for communications between an MS and a core network node in a radio communication network having Femto cells, wherein a given interface is utilized between a GANC and the core network node.
  • the Femto Cell CPE includes means for receiving a message sent from the MS toward the core network node; means for incorporating in a GAN message, an entire uplink message utilized with the given interface between the GANC and the core network node; and means for sending the GAN message, including the incorporated uplink message, from the Femto Cell CPE to the GANC.
  • FIG. 1 is a functional block diagram from 3GPP TS 43.318 illustrating an architecture of the Generic Access Network (GAN);
  • FIG. 2 is a protocol diagram illustrating a circuit-switched (CS) Domain Control Plane Architecture related to the GAN solution of FIG. 1;
  • FIG. 3 is a functional block diagram of an architecture of a GSM-Femto access network;
  • FIG. 4 is a protocol diagram illustrating a CS Domain Control Plane Architecture related to the GSM-Femto solution of FIG. 3;
  • FIG. 5 is a functional block diagram of an architecture of a combined GAN-GSM-Femto access network
  • FIG. 6 is a protocol diagram illustrating a CS Domain Control Plane Architecture related to the combined GAN-GSM-Femto access network of FIG. 5;
  • FIG. 7 is a functional block diagram of an architecture of a WCDMA- Femto access network utilizing GAN communications
  • FIG. 8 is a protocol diagram illustrating a CS Domain Control Plane Architecture related to the WCDMA-Femto access network of FIG. 7;
  • FIG. 9 is a signaling diagram illustrating a first embodiment of the method of the present invention.
  • FIG. 10 is a signaling diagram illustrating a second embodiment of the method of the present invention.
  • FIG. 11 is a signaling diagram illustrating a third embodiment of the method of the present invention.
  • FIG. 12 is a signaling diagram illustrating a fourth embodiment of the method of the present invention.
  • FIG. 5 is a functional block diagram of an architecture of a combined
  • GAN-GSM-Femto access network 50 To develop an access solution with advantages over either the GAN solution or the GSM-Femto solution, one can combine the two solutions, utilizing the best properties of each.
  • the combined solution allows existing MSs to be utilized because the Um-interface is used between the MS 11 and a modified Femto Cell CPE 51.
  • the Femto Cell CPE in the combined solution is modified to include a GAN-client, enabling the Up- interface to be used to connect the Femto Cell CPE 51 to the GANC 13.
  • the standardized Up-interface requires some modifications, and thus a so-called Up+interface is utilized.
  • the GANC uses the normal GSM interfaces towards the CN 14 and the other support nodes as in the normal GAN solution.
  • FIG. 6 is a protocol diagram illustrating a CS Domain Control Plane Architecture 60 related to the combined GAN-GSM-Femto access network of FIG. 5.
  • the Femto Cell CPE 51 is extended both with BSC functionality 61 and with a GAN-client 62.
  • the BSC functionality is needed to terminate the GSM RR protocol from the MS 11 and the GAN-client is needed to interwork between GSM RR and the GA-CSR protocol.
  • the GANC 13 then interworks between the GA-CSR and the BSSAP protocols.
  • FIG. 7 is a functional block diagram of an architecture of a WCDMA- Femto access network 70 utilizing GAN communications.
  • the "GAN-Iu" interface is utilized on the network side and the air interface to the MSs is the Uu-interface.
  • a modified Femto Cell CPE 71 is modified to include UTRAN Radio Network Controller (RNC) functionality.
  • RNC Radio Network Controller
  • FIG. 8 is a protocol diagram illustrating a CS Domain Control Plane Architecture 80 related to the WCDMA-Femto access network of FIG. 7.
  • the modified Femto Cell CPE 71 is modified to include UTRAN RNC functionality in the Radio Resource Control (RRC) 81, Radio Link Control (RLC) 82, and Media Access Control (MAC) 83 layers.
  • RRC Radio Resource Control
  • RLC Radio Link Control
  • MAC Media Access Control
  • the solutions described above have a problem in various signaling procedures triggered from the CN 14 towards the GANC 13.
  • the existing GAN Up-interface and the related protocols like GA-CSR, do not contain the needed support to pass all required information from the A-interface via the Up-interface towards the Femto Cell CPE 31 so it can be used in the Um-interface.
  • This problem may manifest itself in signaling procedures such as setting a Cipher mode.
  • the MSC 21 knows the encryption key to be used and sends the key in a downlink (BSSAP) CIPHER MODE COMMAND message to the GANC 13.
  • BSSAP downlink
  • the encryption key is not used for anything by the GANC since the transmission in GAN is secured using IPsec protocols. So the GANC sends the normal GA-CSR CIPHERING MODE COMMAND message to the Femto Cell CPE 31. This message does not include the encryption key. However, the Femto Cell CPE needs the encryption key because the normal Um-interface is used between the Femto Cell CPE and the MS 11.
  • the same problem may exist in the other direction, i.e., not all information that the Femto Cell CPE 31 receives in uplink messages from the MS 11 is forwarded to the GANC 13.
  • a similar problem may also exist for packet-switched domain signaling in both directions between, for example, the SGSN, GANC, Femto Cell CPE, and the MS.
  • an embodiment of the present invention provides an extension of the GAN Up interface to create a Up+ interface.
  • the Up+ interface provides flexible support for forwarding all the needed signaling from the CN 14 to the Femto Cell CPE 31.
  • Two different embodiments are described below, and in both embodiments, the entire signaling messages received from the CN are forwarded by the GANC 13 to the Femto Cell CPE either as part of the GAN messages triggered by the received signaling message or in a separate GAN message.
  • the invention applies the same technique in the other direction, i.e., from the Femto Cell CPE 31 to the GANC 13 and further to the CN 14.
  • FIG. 9 is a signaling diagram illustrating a first embodiment of the method of the present invention when operating in the downlink direction.
  • the GANC 13 receives a message from the CN 14 which triggers the GANC to send a GAN message to the Femto Cell CPE 51
  • the GANC forwards the entire message received from the CN over the Up+ interface to the Femto Cell CPE in the triggered GAN message.
  • the MSC 21 sends a (BSSAP) CIPHER MODE COMMAND message 91 including encryption information such as an encryption key to the GANC 13.
  • the GANC adds the entire BSSAP message to a GA-CSR CIPHERING MODE COMMAND message 92 that the GANC sends to the Femto Cell CPE 51.
  • the entire BSSAP message is included in a new Layer 3 message information element (IE) at the end of the GA-CSR CIPHERING MODE COMMAND message 92.
  • IE Layer 3 message information element
  • the encryption information included in the (BSSAP) CIPHER MODE COMMAND message 91 is available in the Femto Cell CPE 51, and ciphering can be enabled.
  • the Femto Cell CPE then sends a (GSM RR) CIPHERING MODE COMMAND message 94 to the MS 11.
  • the MS then returns a (GSM RR) CIPHERING MODE COMPLETE message 95 to the Femto Cell CPE.
  • the Femto Cell CPE then sends a GA-CSR CIPHERING MODE COMPLETE message 96 to the GANC 13.
  • the GANC returns a (BSSAP) CIPHER MODE COMPLETE message 97 to the MSC 21.
  • FIG. 10 is a signaling diagram illustrating a second embodiment of the method of the present invention when operating in the downlink direction.
  • the GANC 13 receives a message from the CN 14 which triggers the GANC to send a GAN message to the Femto Cell CPE 51
  • the GANC sends to the Femto Cell CPE, both the triggered GAN message and a second GAN message that includes the entire message received from the CN.
  • the MSC 21 sends a (BSSAP) CIPHER MODE COMMAND message 91 including encryption information such as an encryption key to the GANC 13.
  • the GANC sends a standard GA-CSR CIPHERING MODE COMMAND message 101 to the Femto Cell CPE 51.
  • the GANC creates a new GA-CSR DOWNLINK DIRECT TRANSFER message 102 and includes the entire BSSAP message received from the MSC. This message is also sent to the Femto Cell CPE 51. In the example shown in FIG. 10, the entire BSSAP message is included in a new Layer 3 message IE in the GA-CSR DOWNLINK DIRECT TRANSFER message.
  • the encryption information is available in the Femto Cell CPE 51 , and ciphering can be enabled.
  • the Femto Cell CPE then sends the (GSM RR) CIPHERING MODE COMMAND message 94 to the MS 11.
  • the MS then returns the (GSM RR) CIPHERING MODE COMPLETE message 95 to the Femto Cell CPE.
  • the Femto Cell CPE then sends the GA-CSR CIPHERING MODE COMPLETE message 96 to the GANC 13.
  • the GANC returns the (BSSAP) CIPHER MODE COMPLETE message 97 to the MSC 21.
  • the Femto Cell CPE 51 is extended with BSC functionality 61. This functionality may be utilized to build a required A-interface message (or lu-cs interface message in a WCDMA network) in the Femto Cell CPE.
  • the Femto Cell CPE then sends the A-interface message to the GANC 13 in a GA-CSR message.
  • the GANC then forwards the required information to the CN. If the process was also utilized in the downlink direction, the required A-interface message may be a required response message for the downlink message originally sent from the CN to the GANC.
  • FIG. 11 is a signaling diagram illustrating a third embodiment of the method of the present invention when operating in both the downlink and the uplink directions.
  • the MSC 21 sends the (BSSAP) CIPHER MODE COMMAND message 91 including encryption information such as an encryption key to the GANC 13.
  • the GANC adds the entire BSSAP message to the GA-CSR CIPHERING MODE COMMAND message 92 that the GANC sends to the Femto Cell CPE 51.
  • the entire BSSAP message is included in the new Layer 3 message IE at the end of the GA-CSR CIPHERING MODE COMMAND message 92.
  • the encryption information included in the (BSSAP) CIPHER MODE COMMAND message 91 is available in the Femto Cell CPE 51, and ciphering can be enabled.
  • the Femto Cell CPE then sends a (GSM RR) CIPHERING MODE COMMAND message 94 to the MS 11.
  • the MS then returns a (GSM RR) CIPHERING MODE COMPLETE message 95 to the Femto Cell CPE.
  • the Femto Cell CPE creates an entire (BSSAP) CIPHER MODE COMPLETE message and adds it to a GA-CSR CIPHERING MODE COMPLETE message 111 and sends the message 111 to the GANC 13.
  • the entire BSSAP message may be included in a new Layer 3 message IE at the end of the GA-CSR CIPHERING MODE COMPLETE message.
  • the GANC returns a (BSSAP) CIPHER MODE COMPLETE message 97 to the MSC 21.
  • FIG. 12 is a signaling diagram illustrating a fourth embodiment of the method of the present invention when operating in both the downlink and the uplink directions.
  • the GANC 13 receives a message from the CN 14 which triggers the GANC to send a GAN message to the Femto Cell CPE 51
  • the GANC sends to the Femto Cell CPE, both the triggered GAN message and a second GAN message that includes the entire message received from the CN.
  • the Femto Cell CPE In the uplink direction, when the Femto Cell CPE receives a message from the MS 11 which triggers the Femto Cell CPE to send a GAN message to the GANC, the Femto Cell CPE sends to the GANC, both the triggered GAN message and a second GAN message that includes all of the information received from the MS.
  • the MSC 21 sends the (BSSAP) CIPHER MODE COMMAND message 91 including encryption information such as an encryption key to the GANC 13.
  • the GANC sends the standard GA-CSR CIPHERING MODE COMMAND message 101 to the Femto Cell CPE 51.
  • the GANC creates the new GA-CSR DOWNLINK DIRECT TRANSFER message 102 and includes the entire BSSAP message received from the MSC. This message is also sent to the Femto Cell CPE 51.
  • the entire BSSAP message is included in a new Layer 3 message IE in the GA-CSR DOWNLINK DIRECT TRANSFER message.
  • the encryption information is available in the Femto Cell CPE 51 , and ciphering can be enabled.
  • the Femto Cell CPE then sends the (GSM RR) CIPHERING MODE COMMAND message 94 to the MS 11.
  • the MS then returns the (GSM RR) CIPHERING MODE COMPLETE message 95 to the Femto Cell CPE.
  • the Femto Cell CPE then sends to the GANC 13, both the standard GA-CSR CIPHERING MODE COMPLETE message 96 and a GA- CSR UPLINK DIRECT TRANSFER message 121.
  • the Femto Cell CPE includes an entire (BSSAP) CIPHER MODE COMPLETE message in the GA- CSR UPLINK DIRECT TRANSFER message 121.
  • the entire BSSAP message may be included in a new Layer 3 message IE in the GA-CSR DOWNLINK DIRECT TRANSFER message.
  • the GANC returns the (BSSAP) CIPHER MODE COMPLETE message 97 to the MSC 21
  • the present invention provides for relatively simple implementation in the GANC 13 and/or the Femto Cell CPE 51.
  • forwarding the entire (BSSAP) CIPHER MODE COMMAND message from the GANC to the Femto Cell CPE avoids the requirement to perform detailed procedures to identify specific IEs.
  • the invention always provides the Femto Cell CPE 51 with all the required information, even if new information is added to the BSSAP signaling between the MSC 21 and the GANC.
  • forwarding the entire (BSSAP) CIPHER MODE COMPLETE message from the Femto Cell CPE to the GANC also avoids the requirement to perform detailed procedures to identify specific IEs.
  • the invention always provides the GANC with all the required information, even if new information is added to the GSM RR signaling between the MS 11 and the Femto Cell CPE.

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

Abstract

L'invention porte sur un procédé, un contrôleur de réseau d'accès générique (GANC) (13), un équipement des locaux d'abonnés (CPE) de femtocellule (51) pour utiliser des communications de réseau d'accès générique (GAN) entre un nœud de réseau central tel qu'un centre de communication mobile (MSC) (21) et une station mobile (MS) (11) dans un réseau de communication comprenant des femtocellules. Dans le sens de la liaison descendante, le GANC (13) incorpore un message de liaison descendante entier reçu en provenance du MSC (21) dans un message GAN et envoie le message GAN au CPE de femtocellule (51), ce qui garantit ainsi la réception de toutes les informations requises par le CPE de femtocellule. Dans le sens de liaison montante, le CPE de femtocellule (51) incorpore dans un message GAN un message de liaison montante entier utilisé avec l'interface entre le GANC et le MSC, telle que l'interface A. Le message GAN est ensuite envoyé au GANC (13), ce qui garantit ainsi la réception de toutes les informations requises par le GANC.
PCT/SE2008/050551 2008-05-13 2008-05-13 Réseau d'accès générique (gan) à femtocellules WO2009139674A1 (fr)

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PCT/SE2008/050551 WO2009139674A1 (fr) 2008-05-13 2008-05-13 Réseau d'accès générique (gan) à femtocellules

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PCT/SE2008/050551 WO2009139674A1 (fr) 2008-05-13 2008-05-13 Réseau d'accès générique (gan) à femtocellules

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8654723B2 (en) 2011-03-04 2014-02-18 Rogers Communications Inc. Method and device for re-using IPSec tunnel in customer premises equipment
CN106878972A (zh) * 2015-12-11 2017-06-20 中国移动通信集团公司 一种网络接入方法、设备及系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031214A1 (en) * 2006-08-07 2008-02-07 Mark Grayson GSM access point realization using a UMA proxy
US20080076393A1 (en) * 2006-09-22 2008-03-27 Amit Khetawat Method and apparatus for securing communication between an access point and a network controller

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031214A1 (en) * 2006-08-07 2008-02-07 Mark Grayson GSM access point realization using a UMA proxy
US20080076393A1 (en) * 2006-09-22 2008-03-27 Amit Khetawat Method and apparatus for securing communication between an access point and a network controller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8654723B2 (en) 2011-03-04 2014-02-18 Rogers Communications Inc. Method and device for re-using IPSec tunnel in customer premises equipment
CN106878972A (zh) * 2015-12-11 2017-06-20 中国移动通信集团公司 一种网络接入方法、设备及系统
CN106878972B (zh) * 2015-12-11 2020-11-06 中国移动通信集团公司 一种网络接入方法、设备及系统

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