WO2008014660A1 - Procédé de communication du noeud b à cn, système correspondant et dispositifs - Google Patents

Procédé de communication du noeud b à cn, système correspondant et dispositifs Download PDF

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Publication number
WO2008014660A1
WO2008014660A1 PCT/CN2007/001727 CN2007001727W WO2008014660A1 WO 2008014660 A1 WO2008014660 A1 WO 2008014660A1 CN 2007001727 W CN2007001727 W CN 2007001727W WO 2008014660 A1 WO2008014660 A1 WO 2008014660A1
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WIPO (PCT)
Prior art keywords
base station
user plane
mobile switching
switching center
core network
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Application number
PCT/CN2007/001727
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English (en)
Chinese (zh)
Inventor
Xinfa Wang
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Huawei Technologies Co., Ltd
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Publication date
Application filed by Huawei Technologies Co., Ltd filed Critical Huawei Technologies Co., Ltd
Publication of WO2008014660A1 publication Critical patent/WO2008014660A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/14—Interfaces between hierarchically different network devices between access point controllers and backbone network device

Definitions

  • Base station to core network communication method, system and device
  • the present invention relates to the field of wireless communication technologies, and in particular, to a communication method, system and device for a base station to a circuit domain core network.
  • the so-called flattening in a nutshell, is to minimize the number of network elements that need to pass through signaling and user data in a single business process.
  • the advantage of flattening the network is that the types and quantities of network elements involved in service processing are reduced, the network structure is reduced, the service access speed is increased, and the user data transmission delay is reduced.
  • the universal mobile communication system (UMTS) capable of better serving the hierarchical architecture (UMTS) , Universal Mobile Telecommunications System ) Markets neglected by the network, such as homes, corporate markets, etc.
  • the UMTS network consists of CN (Core Network), RAN (Radio Access Network) and UE.
  • CN Core Network
  • RAN Radio Access Network
  • UE User Equipment
  • the radio access network RAN includes a base station NODE B and a base station controller R C .
  • the core network CN can be logically divided into a packet switched domain (PS) and a circuit switched domain (CS).
  • the CS domain is a circuit switched core network of UMTS for supporting circuit data services.
  • the PS domain is a packet service core network of UMTS. Used to support packet data services and some multimedia services.
  • the interface between the base station controller R C and the base station NODE B is Iub
  • the interface between the base station controller RNC and the CS domain is Iu-CS
  • the interface between the base station and the PS domain is Iu-PS.
  • the main starting point for the existing UMTS network flattening is to re-differentiate existing UMTS network elements to reduce the number of vertical NEs and reduce user plane and signaling plane delay.
  • there is a direct connection scheme from the base station to the packet domain core network that is, a scheme in which the user plane interface is merged in the PS network, such as a scheme named "one channel", which combines the user planes of the Iu-PS interface and the Gn interface.
  • the user interface data transfer link is reduced to improve the processing performance.
  • Another solution is to combine the user planes of the Iub interface, the Iu-PS interface, the Gn interface, and the Gi interface into one interface, that is, the base station directly supports the communication method of the Gi interface. It can also reduce the user plane data transfer link, thereby improving PS domain performance.
  • the user equipment UE is connected to NODE B through a standard Uu interface, and NODE B and RNC are interconnected through a standard lub interface, and a standard Iu-CS interface between the RNC and the MSC.
  • the control plane (CP) of the lub interface uses the NODE B application protocol (NBAP), and the user plane (UP) uses the frame protocol (FP).
  • the control plane of the Iu-CS interface adopts the Radio Access Network Application Part (RANAP) protocol
  • the user plane adopts the lu interface user plane protocol (lu UP in the case of the lub interface and the Iu-CS interface based on the ATM bearer, the CS user plane data frame
  • RANAP Radio Access Network Application Part
  • the lub interface and the Iu-CS interface can support IP transmission, but the CS user plane data frame is still transmitted to the RNC via NODE B, and then transmitted by the RNC. To the MSC, that is to say, it still needs to reach the MSC through the two interfaces lub and Iu-CS.
  • the user plane data frames still need to be transmitted segment by segment, that is, from NODE B to RC, and then from the RNC to the MSC, after passing two IP addresses. Transmission, so that the user data transmission process is longer, and the transmission delay is also extended.
  • Embodiments of the present invention provide a communication method, system, and device for a base station to a core network.
  • the method and system can implement direct communication of user plane data of a base station to a circuit domain core network, and simplify the data transmission process.
  • a base station-to-core network communication method in which a user plane protocol between a directly supported radio access network and a core network circuit domain is set in a base station; the method further includes:
  • the base station establishes a control plane connection with the mobile switching center in the core network through the base station controller;
  • the base station applies a user plane protocol between the directly supported radio access network and the core network circuit domain, establishes a user plane connection with the mobile switching center, and directly performs user plane data communication.
  • a communication system from a base station to a core network comprising:
  • a base station controller configured to transfer data between the base station and the mobile switching center
  • a base station configured to interact with a base station controller to establish and connect to the core network via the base station controller Control plane connection between the mobile switching centers; application of a user plane protocol between the directly supported radio access network and the core network circuit domain, establishing a user plane connection with the mobile switching center, and performing user plane data communication; And configured to establish a control plane connection with the base station by using the base station controller; directly establish a user plane connection with the base station, and perform user plane data communication.
  • a base station comprising:
  • control plane unit configured to interact with the base station controller to establish a control plane connection with the mobile switching center in the core network via the base station controller;
  • the user plane unit is configured to apply a user plane protocol between the directly supported radio access network and the core network circuit domain, establish a user plane connection with the mobile switching center, and directly perform user plane data communication.
  • a base station controller includes a transmission control unit, configured to transmit data between a base station and a mobile switching center; the transmission control unit further includes:
  • a user plane connection control unit configured to respectively receive a control message including user plane parameter information from the mobile switching center and the base station, and send user plane parameter information of the mobile center to the base station, where the base station is User plane parameter information is sent to the mobile switching center such that a user plane connection can be established between the mobile switching center and the base station.
  • a mobile switching center including:
  • control plane unit configured to interact with the base station controller to establish a control plane connection with the base station via the base station controller
  • the user plane unit is configured to establish a user plane connection with the base station, and directly perform user plane data communication.
  • the user data is transmitted from the NODE B to the RNC and then transmitted to the MSC, so that the data transmission process is long and the transmission delay is also extended, and the embodiment of the present invention passes the radio access network and the core network circuit domain.
  • the user plane protocol is transplanted to the base station, so that the base station directly supports the user plane protocol between the radio access network and the core network circuit domain, so that the user data is directly transmitted from the NODE B to the MSC, that is, the original two IP transmissions are merged.
  • the base station controller RNC does not need to perform the circuit domain user plane data packet forwarding processing, which contends the RNC processing load, and simultaneously It also reduces the cost of the RNC.
  • FIG. 1 is a schematic diagram of a base station to circuit domain core network interface method in the prior art
  • FIG. 2 is a schematic structural diagram of a protocol stack of an Iu-CS in the prior art
  • FIG. 3 is a schematic structural diagram of a protocol stack of an Iub in the prior art
  • FIG. 4 is a schematic flowchart of a base station-to-circuit domain core network communication method according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a base station-to-circuit domain core network control plane interface method according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a user plane protocol stack of an interface between a NODE B and an MSC according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a protocol stack of an improved Iub in an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a NODE B switching process in an embodiment of the present invention.
  • Figure 11 is a schematic diagram of a system in accordance with an embodiment of the present invention.
  • Embodiments of the present invention provide a base station to core network communication method and system, including: a base station directly supports a user plane protocol between a radio access network and a core network circuit domain; and the mobile switching center transmits its own user through a base station controller.
  • the surface parameter information is sent to the base station; the base station directly sends data to the mobile switching center according to the user plane parameter information of the mobile switching center, and the mobile switching center receives the data.
  • the protocol structure is divided into two main layers: the wireless network layer and the transport network layer.
  • the wireless network layer includes a control plane and a user plane
  • the transport network layer includes a transport network user plane corresponding to the control plane and the user plane, respectively.
  • the Iu-CS user plane uses the Iu UP protocol to transmit all the information sent and received by the user.
  • the main functions of the Iu UP protocol include: user plane data frame transmission, rate control, initialization, and error handling.
  • the Iu-CS control plane adopts the RANAP protocol of the radio access network application, and mainly implements the RANAP protocol function, including: relocation of the service RC, management of the radio access bearer RAB, establishment of the Iu connection/release/reset, overload control, Paging, security mode control, location reporting, error reporting, and more.
  • the transport network user plane corresponding to the control plane includes a signaling connection control part SCCP, a message adaptation part MTP layer 3 user adaptation layer M3UA, a flow control transmission protocol SCTP and an internet protocol ⁇ >, and a data link layer and a physical layer .
  • User plane corresponding transmission includes a real-time transport protocol RTP/Real-Time Transport Control Protocol (RTCP), a User Data Protocol UDP/Internet Protocol IP, and a data link layer and a physical layer.
  • RTCP real-time transport protocol
  • UDP/Internet Protocol IP User Data Protocol
  • the protocol structure is also divided into two main layers: the wireless network layer and the transport network layer.
  • the control plane and the user plane are used, the control plane adopts the NODE B application protocol NBAP, and the user plane adopts the frame protocol FP, wherein the frame protocol includes a dedicated channel DCH frame protocol, a random access channel RACH frame protocol, and forward access.
  • the transport layer corresponding to the control plane NBAP protocol includes a flow control transport protocol SCTP and an internet protocol IP, as well as a data link layer and a physical layer.
  • the transport layer corresponding to the user plane FP protocol includes the User Datagram Protocol UDP and the Internet Protocol IP, as well as the data link layer and the physical layer.
  • the Iu UP protocol of the RNC is transplanted from the RNC to the NODE B.
  • the RNC only retains the control plane function of the Iu-CS interface, and the user plane directly communicates with the MSC by the NODE B, omitting the intermediate RNC forwarding. Since IP transmission is used, the connectionless transmission protocol UDP is used, and the transmission does not need to establish a separate connection, so no special transmission network control plane protocol is needed at this time.
  • FIG. 4 it is a flowchart of a method for communicating a base station to a circuit domain core network according to an embodiment of the present invention, including the steps:
  • the base station sends data to the mobile switching center according to the user plane parameter information transmitted by the mobile switching center via the base station controller;
  • the mobile switching center receives the data.
  • the base station also transmits its own user plane parameter information to the mobile switching center via the base station controller, and the mobile switching center transmits data to the base station according to the user plane parameter information of the base station.
  • the method for porting the Iu-CS interface user plane protocol Iu UP to the base station is as shown in FIG. 5 and FIG. 6 .
  • the user equipment UE is still connected to NODE B through a standard Uu interface.
  • NODE B and RNC, and the control plane function between RNC and MSC remain unchanged, that is, the control plane between RNC and NODE B maintains the 3GPP architecture unchanged, and the control plane RANAP protocol between NC and MSC retains 3GPP.
  • the architecture is unchanged, but the user plane of the IRC-CS interface of the RNC has changed.
  • the Iu-CS user plane Iu UP protocol stack has been migrated from the RC to the NODE B, that is, the IB-CS user plane function between the NodeB and the MSC. Because NODE B needs to directly communicate with the MSC, NODE B needs to support the Iu UP protocol.
  • NODE B and MSC directly User plane interaction, the circuit domain data frame passed from the Uu interface to NODE B, directly packaged by NODE B into
  • the data frame of the Iu UP is then sent to the MSC; the user plane DCH channel of the lub interface between the RNC and the NODEB no longer functions. That is to say, the control plane interface shown in FIG. 5 is the same as the prior art, and FIG. 6 is different from the existing method, that is, the user plane data interface is directly performed between NODE B and the MSC.
  • FIG. 7 is a schematic diagram of the structure of the user plane 10 protocol stack of the interface between the NODE B and the MSC in the embodiment of the present invention.
  • the Iu-CS user plane protocol stack in Figure 2 is migrated from RC to NODE B.
  • the user plane uses the Iu UP protocol.
  • the user plane corresponding to the user plane includes the real-time transport protocol RTP. / Real-time transport control protocol RTCP, User Datagram Protocol UDP/Internet Protocol IP, and data link layer and physical layer.
  • FIG. 8 is a schematic diagram of the structure of the protocol stack of the improved lub in the embodiment of the present invention.
  • the frame protocol function of the user plane common transport channel of the lub interface continues to be reserved between NODE B and RNC.
  • the user plane dedicated channel DCH frame protocol of the lub interface between RNC and NODE B no longer functions.
  • the wireless network layer includes a random access channel RACH frame protocol, a forward access channel FACH frame protocol, a paging channel PCH frame protocol, and other common transport channel frame protocols, and corresponds to a user plane protocol FP.
  • the transport layer includes the User Datagram Protocol UDP and the Internet Protocol IP, as well as the data link layer and the physical layer.
  • FIG. 9 is a schematic flowchart of the assignment process of RNC/NODE B and MSC according to an embodiment of the present invention, including the steps:
  • RNC receives the Radio Access Bearer (RAB) from the MSC.
  • RAB Radio Access Bearer
  • RNC initiates a radio link reconfiguration preparation RLRP (Radio Link Reconfiguration Preparation) message to NODE B, and transmits the IP address and UDP port number of the MSC side to NODE B;
  • RLRP Radio Link Reconfiguration Preparation
  • NODE B3 responds to RNC with radio link reconfiguration ready RLR (Radio Link
  • Reconfiguration Ready message including NODE B side IP address and user data 4 ⁇ (User Datagram Protocol) port number;
  • the RNC initiates a radio link reconfiguration commit message to the NODE B.
  • the user plane address information carried in the message is the address information of the MSC.
  • NODE B initiates an Iu UP initialization process to the MSC
  • the control planes of the Iub and Iu-CS interfaces follow the standard signaling flow.
  • the modification with the 3GPP standard is: In the radio link reconfiguration preparation process initiated by the RKC to NODE B, the carried user plane address information is the address information of the MSC, which is not the address information of the RNC itself defined by the general protocol, and this modification is for NODE B. It is not visible. In the RAB assignment response message sent by the R C to the MSC, the user plane address information carried is the user plane address information of NODE B, instead of the address information of the RNC itself defined by the general protocol, and the modification is invisible to the MSC. That is to say: the RNC user plane address information does not exist.
  • the RNC address information is actually NODE B; for NODE B, the RNC address information is actually the MSC.
  • the modification of the user plane and the standard procedure is: The Iu UP process between the original RNC and the MSC is now implemented between NODE B and the MSC.
  • radio link reconfiguration signaling flow of the Iub interface in FIG. 9 is illustrated in a synchronous manner, and may also be implemented in an asynchronous manner.
  • the IP address and UDP port number of the MSC and NODE B on both sides of the Iu-CS user plane interface are similarly transmitted.
  • Step B2 of the above process is modified to be a radio link.
  • the configuration request (Radio Link Reconfiguration Request)
  • the step B3 is modified into a radio link reconfiguration response (Radio Link Reconfiguration Response)
  • the step B4 Radio Link Reconfiguration Commit
  • the handover between the NODE Bs within the RNC is performed by the R C through the standard NBAP protocol, and the MSC is not required to be notified, and the handover is not visible to the MSC.
  • the NODE B directly communicates with the MSC, the user plane data channel is directly established between the NODE B and the MSC, so the switching between the NODE B causes a change in the circuit domain data channel with the MSC.
  • the MSC needs to be notified in time to update the user plane data transmission channel.
  • the RNC needs to extend the existing RANAP message to support the modification of the Iu-CS interface access network side user plane address, that is, The RAB MODIFY REQUEST message needs to be extended, so that the message can request the MSC to modify the IP address of the user plane of the access network RAN side, that is, the NODE B side IP address: The user plane IP address of the IU-CS interface
  • the original ODE B is modified to the IP address of the destination NODE B to support the switching process between the RNC internal NODE B.
  • the cells defined in the 3GPP R6 standard in the RAB modification request message include the maximum rate and the guaranteed rate of the request for rate control, and an optional RAB configuration request for the video call initiated by the access network.
  • the embodiment of the present invention adds a "transport layer information" cell to the original cell, and is used to request the MSC to modify the IP address of the RAN side of the user plane access network of the Iu-CS interface, and the transport layer information includes the transport layer address and the Iu interface transmission tie. Set the number.
  • the transport layer address refers to the new access network side IP address
  • the Iu interface transport binding number refers to the UDP port number used by the new access network side specific user data stream, which is the NODE B IP address for the embodiment of the present invention.
  • the UDP port number used by the particular user data stream is used to the particular user data stream.
  • FIG. 10 it is a schematic diagram of a NODE B handover process in an embodiment of the present invention, including the steps: CI, RC detecting that a UE initiates a handover between NODE Bs;
  • the C2 and the RNC initiate a RAB modification request (RAB MODIFY REQUEST) to the MSC, and request to modify the user plane address of the access network side of the Iu interface, that is, the NODE B side IP address;
  • the MSC After receiving the RAB modification request initiated by the RC, the MSC sends an RAB assignment request message to the RNC, where the message includes the RAB identifier and the transport layer information, where the transport layer information includes the MSC side IP address and the UDP port number; After receiving the RAB assignment request of the MSC, the RNC initiates an RAB assignment response, where the message includes the RAB identifier and the transport layer information, and the transport layer information includes the NODE B side IP address and the UDP port number, which are used to modify the connection. IP address of the user side on the network side. After receiving the modification information, the MSC will modify the IP address and UDP port number of NODE B accordingly.
  • an embodiment of the present invention provides a communication system between a base station and a core network.
  • FIG. 11 is a schematic diagram of a system according to an embodiment of the present invention.
  • the system includes: a base station 901, a base station controller 902, and a mobile switching center 903; the base station 901 is configured to interact with the base station controller to establish a control plane connection with the mobile switching center in the core network via the base station controller; a user plane protocol between the directly supported radio access network and the core network circuit domain, establishing a user plane connection with the mobile switching center, and performing user plane data communication, such as directly moving according to user plane parameter information of the mobile switching center 903
  • the switching center 903 transmits data;
  • the base station controller 902 is configured to transfer data between the base station and the mobile switching center, such as transmitting the user plane parameter information of the mobile switching center 903 to the base station 901; and the mobile switching center 903 is configured to perform the base station controller.
  • 902 establishes a control plane connection with the base station 901; directly establishes a user plane connection with the base station 901, performs user plane data communication
  • the base station 901 further includes means for transmitting its own user plane parameter information to the mobile switching center 903 via the base station controller 902, and the mobile switching center 903 directly transmits data to the base station 901 according to the user plane parameter information of the base station 901.
  • the user plane parameter information includes a user plane network address and a port number.
  • the base station controller 902 further includes means for transmitting a handover destination side base station user plane network address and a port number to the mobile switching center 903 upon detecting that a handover is to occur between the base stations.
  • the base station controller 902 sends the handover destination side base station user plane network address and port number to the mobile switching center 903 by using a radio access bearer update request message.
  • the user plane protocol Iu UP protocol between the radio access network supported by the base station controller (RNC) 902 and the core network circuit i or the Iu UP protocol is transplanted from the RNC 902 to the base station (NODE B) 901, that is, It is said that the base station 901 directly supports the Iu-CS interface user plane protocol Iu UP, and the NC902 only retains the Iu-CS interface control plane function, and the user plane directly communicates with the mobile switching center (MSC) 903 by the NODE B901, omitting the intermediate RNC 902 forwarding link.
  • RNC base station controller
  • NODE B base station
  • control plane NBAP protocol between the RNC 902 and the NODE B 901 retains the 3GPP architecture
  • the RNC 902 and the MSC 903 The control plane RANAP protocol keeps the 3GPP architecture unchanged, but the user plane of the Iu-CS interface of the RNC902 changes, and the Iu-CS user plane Iu UP protocol stack has been transplanted from the RNC902 to the NODE B901, that is, the IUD between the NODE B901 and the MSC 903 - The function of the CS user plane.
  • the ODE B901 and the MSC 903 directly perform user plane interaction, and the circuit domain data frame transmitted from the Uu interface to the NODE B901 is directly packed into the Iu UP data frame by the NODE B901, and then transmitted to the MSC 903.
  • the RNC 902 needs to extend the existing RANAP message to support the modification of the Iu-CS interface access network side user plane address. That is, the RAB MODIFY REQUEST message needs to be extended, so that the message can be requested from the MSC 903 to modify the IP address of the user plane of the access network RAN side, that is, the NODE B901 side IP address, specifically in the original message.
  • a new "transport layer information" cell is added to the cell to request the MSC 903 to modify the IP address of the RAN side of the user plane access network of the Iu-CS interface.
  • the transport layer information includes the transport layer address and the Iu interface transport binding number.
  • the transport layer address refers to the new access network side IP address.
  • the Iu interface transmission binding number refers to the new access network side.
  • the UDP end will modify the BP address and UDP port number of the ODE B901 after receiving the modification information.
  • the embodiment of the present invention further provides a base station, which is not shown, and includes:
  • control plane unit configured to interact with the base station controller to establish a control plane connection with the mobile switching center in the core network via the base station controller;
  • the user plane unit is configured to apply a user plane protocol between the directly supported radio access network and the core network circuit domain, establish a user plane connection with the mobile switching center, and directly perform user plane data communication.
  • the embodiment of the present invention further provides a base station controller, including a transmission control unit, configured to transmit data between the base station and the mobile switching center; the transmission control unit further includes:
  • a user plane connection control unit configured to respectively receive a control message including user plane parameter information from the mobile switching center and the base station, and send user plane parameter information of the mobile center to the base station, where the base station is User plane parameter information is sent to the mobile switching center such that a user plane connection can be established between the mobile switching center and the base station.
  • the base station controller further includes a base station handover control unit, configured to send, to the mobile switching center, user plane parameter information of the handover destination side base station when the handover between the base stations is to be detected.
  • the user plane parameter information includes a user plane network address and a port number.
  • the embodiment of the invention further provides a mobile switching center, including:
  • control plane unit configured to interact with the base station controller to establish a control plane connection with the base station via the base station controller
  • the user plane unit is configured to establish a user plane connection with the base station, and directly perform user plane data communication.
  • the embodiment of the present invention uses the UMTS network as an example, but is not limited thereto.
  • Embodiments of the present invention are equally applicable to code division multiple access CDMA networks and other wireless networks that can be based on IP bearer circuit domain voice and video telephony.
  • the base station transceiver CDMA network base station transceiver BTS/base station controller BSC/mobile switching center MSC entity circuit domain service, its direct connection from the base station to the switching center MSC is also within the scope of the invention.

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Abstract

L'invention concerne un procédé de communication du noeud B à CN, un système correspondant et des dispositifs. Selon ce procédé, un protocole niveau utilisateur est configuré entre RAN et l'aspect circuit de CN dans le noeud B. De plus, au niveau contrôle, le noeud B établit une connexion niveau commande avec MSC dans CN par RNC tandis qu'au niveau utilisateur, ledit noeud B applique le protocole niveau utilisateur pour établir la connexion niveau utilisateur avec le MSC de manière à directement exécuter la communication de données au niveau utilisateur. La communication directe peut être exécutée entre le noeud B et l'aspect circuit du CN, et la procédure de transfert de données peut être simplifiée.
PCT/CN2007/001727 2006-07-26 2007-05-29 Procédé de communication du noeud b à cn, système correspondant et dispositifs WO2008014660A1 (fr)

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CNA2006100995091A CN101115286A (zh) 2006-07-26 2006-07-26 一种基站到核心网的通信方法及系统
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JP6497444B2 (ja) 2015-10-23 2019-04-10 日本電気株式会社 固定ブロードバンドアクセスネットワークの制御に関連する装置

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