WO2010057414A1 - 支持基站数据交换的装置、系统及方法 - Google Patents

支持基站数据交换的装置、系统及方法 Download PDF

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Publication number
WO2010057414A1
WO2010057414A1 PCT/CN2009/074788 CN2009074788W WO2010057414A1 WO 2010057414 A1 WO2010057414 A1 WO 2010057414A1 CN 2009074788 W CN2009074788 W CN 2009074788W WO 2010057414 A1 WO2010057414 A1 WO 2010057414A1
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WIPO (PCT)
Prior art keywords
port
logical port
outgoing
data packet
pon
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PCT/CN2009/074788
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English (en)
French (fr)
Inventor
郑若滨
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华为技术有限公司
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Publication of WO2010057414A1 publication Critical patent/WO2010057414A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q11/0067Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • H04B10/272Star-type networks or tree-type networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q11/0071Provisions for the electrical-optical layer interface
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/26Network addressing or numbering for mobility support
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W80/00Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04Network layer protocols, e.g. mobile IP [Internet Protocol]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/16Interfaces between hierarchically similar devices
    • H04W92/20Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to an apparatus, system, and method for supporting base station data exchange.
  • LTE Long Term Evolution
  • MME Mobility Management Entity
  • the management control plane protocol such as the assignment of the user terminal identifier, security, authentication, and roaming control
  • the Serving Gateway manages the user plane protocol, such as storing the user terminal context, encryption context, and the like.
  • an X2 interface is used between the enhanced NodeBs (eNBs) for transmitting handover data packets; and an S1 interface is used between the eNB and the A-GW.
  • the LTE network has a very high latency requirement for mobile bearer networks, requiring end-to-end delays of less than 10 milliseconds.
  • the network architecture of the World Interoperability for Microwave Access is similar to the LTE network.
  • the WiMAX access network uses a two-stage structure, which is composed of a base station (BS) and an access network gateway (Access).
  • Service Network Gateway ASN GW
  • BS corresponds to eNB
  • Access Service Network Gateway A-GW
  • R8 interface is used between BSs for transmitting handover data Packet; use the R6 interface between the BS and the ASN GW.
  • Port using GPON Encapsulation Method (GEM) port-ID for labeling Knowledge.
  • GEM GPON Encapsulation Method
  • the PON service logical transmission pipeline is a Logical Link Identifier (LLID) pipeline, which is identified by LLID.
  • LLID Logical Link Identifier
  • the main service bearers of PON are Ethernet over GEM (Ethernet bearer in GEM) and IP over.
  • GEM IP is hosted on GEM.
  • the PON-based mobile bearer When using a PON network, such as GPON (or EPON) or next-generation GPON (or EPON) as the transmission network of the above U-TRAN network or WiMAX network, the PON-based mobile bearer is shown in Figure 2, and the optical path termination point ( Optical Line Termination, OLT)
  • OLT Optical Line Termination
  • Embodiments of the present invention provide an apparatus, system, and method for supporting base station data exchange to solve the problem of supporting a X2 interface as a PON network of a transmission network.
  • An optical path termination point OLT supporting base station data exchange includes:
  • a passive optical network PON configuration unit configured to allocate, to the base station BS, a PON service logical port corresponding to an IP address of the BS, where the logical port of the PON service includes a logical port for entering the PON service and a logical port for the outgoing PON service, and is used for Inter-BS communication interface interaction data packet in the BS;
  • the IP forwarding unit is configured to receive, by using the PON service logical port, a data packet sent by the source BS, according to the destination IP address of the data packet, the physical port or the incoming optical network unit ONU port, and the PON service logical port, The pre-established IP forwarding table is obtained, and the physical port of the data packet or the outgoing U port and the outgoing PON service logical port are obtained, and the data is obtained by using the outgoing physical port or the outgoing ONU port and the outgoing PON service logical port. The message is forwarded to the destination BS.
  • a base station BS includes: [18] a handover processing unit, configured to generate a data packet transmitted between the BSs, and transmit the data packet to the IP forwarding unit;
  • the IP forwarding unit is configured to query a pre-established IP forwarding table according to the destination IP address of the data packet sent by the switching processing unit, and obtain an outgoing PON service logical port corresponding to the data packet. And sending the data packet to the OLT through the outbound PON service logical port.
  • a system for supporting base station data exchange including an OLT, a source BS, and a destination BS, where
  • the source BS is configured to generate a data packet that is transmitted between the source BS and the destination BS, and query a pre-established IP forwarding table according to the destination IP address of the data packet to obtain the data.
  • the PON service logical port corresponding to the packet, and the data packet is sent to the OLT through the outgoing PON service logical port;
  • the OLT is configured to receive a data packet sent by the source BS, according to the destination IP address of the data packet, the physical port or the ONU port of the incoming optical network unit, and the logical port of the incoming PON service, and the query is pre-established.
  • the IP forwarding table is configured to obtain the physical port of the data packet, the outgoing ONU port, and the outbound PON service logical port, and forward the data packet to the outgoing physical port or the outgoing PON service logical port by using the outgoing physical port or the outgoing PON service logical port.
  • the destination BS is configured to receive a data packet sent by the source BS, according to the destination IP address of the data packet, the physical port or the ONU port of the incoming optical network unit, and the logical port of the incoming PON service, and the query is pre-established.
  • the IP forwarding table is configured to obtain the physical port of the data packet, the outgoing ONU port, and the outbound PON service logical port, and forward the data packet to
  • a method for data exchange of a base station, the IP forwarding table is pre-established, and the method specifically includes:
  • the embodiment of the present invention supports X2/R8 (interface between BSs) and S1/R6 (interface between BS and ASN GW) interfaces through the OLT.
  • the data packet transmitted is monitored by DHCP based on the IP forwarding table of the PON service logical port for establishing the BS and the IP port for the X2/R8 interface transmission.
  • the IP forwarding table is used to implement local exchange of base station data, and the BS is implemented. Inter-communication.
  • FIG. 1 is a schematic structural diagram of an LTE network in the prior art
  • FIG. 2 is a schematic diagram of a PON-based mobile bearer in the prior art
  • FIG. 3 is a schematic structural diagram of a PON system supporting local exchange of OLT according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural diagram of a function of an OLT according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another OLT according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a functional structure of a BS according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of another BS according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a process of establishing an IP forwarding table of an X2/R8 interface by a signaling processing unit provided by Embodiment 3.
  • FIG. 9 is a flowchart of data forwarding for implementing local exchange of an OLT according to Embodiment 3.
  • the OLT allocates a PON service logical port corresponding to the IP address of the BS to the BS, where the PON service logical port includes a logical port for entering the PON service and a logical port for outgoing the PON service, and is used for
  • the inter-BS communication interface in the BS exchanges data packets.
  • the OLT receives the data packet sent by the source BS through the ingress PON service logical port, according to the destination IP address of the data packet, the physical port or the optical network unit (optical network)
  • the ONU port, the inbound PON service logical port queries the pre-established IP forwarding table, obtains the physical port of the data packet, the outgoing ONU port, and the outgoing PON service logical port, and uses the outgoing physical port or The outbound port and the outbound PON service logical port forward the data packet to the destination BS.
  • FIG. 3 A schematic structural diagram of a PON system supporting local exchange of OLTs provided in this embodiment is shown in FIG. 3.
  • the OLT supports data packets transmitted by the X2/R8 and S1/R6 interfaces, and allocates PON service logical ports for the X2/R8 and S1/R6 interface transmissions to the BS.
  • the OLT supports dynamic host configuration protocol (DHCP) listening, and listens to the IP address assigned to the BS through DHCP, and establishes an IP forwarding table based on the BS-based IP address and the PON service logical port, and the P0 N service logic
  • the port includes the P0N service logical port and the outgoing P0N service logical port, thereby implementing local exchange of base station data to support the X2/R8 interface.
  • OLT uses Layer 2 forwarding to support S1/R6.
  • the Layer 2 service isolation function of the user data of the S1/R6 interface remains unchanged.
  • the BS can embed an ONT, and different BSs correspond to different ONT IDs, and the ONT ID can be used as a BS ID.
  • the OLT can implement data packets supported by the X2/R8 and S1/R6 interfaces through the following two solutions:
  • Solution 1 the OLT uses the Layer 3 forwarding mode to support the data packets transmitted by the X2/R8 interface, and the data packets transmitted by the X2/R8 interface are identified by a specific Virtual Local Area Network (VLAN) identifier;
  • the Layer 2 forwarding mode is also used to support the data packets transmitted by the S1/R6 interface.
  • the OLT also supports the Address Resolution Protocol Proxy (ARP Proxy)' for the address resolution protocol from the X2/R8 interface.
  • ARP Proxy Address Resolution Protocol Proxy
  • ARP Request 'ARP Proxy responds to the BS with the OLT's Medium Access Control (MAC) address; ARP Proxy for the ARP request from the S1/R6 interface to the wireless gateway (eg AGW or ASN GW) The MAC address is echoed to the BS.
  • MAC Medium Access Control
  • the above scheme 1 can be applied to the case of GPON, EPON, next-generation GPON or next-generation EPON as a transmission network.
  • Solution 2 The OLT uses the IP over GEM mode to support data packets transmitted by the X2/R8 interface.
  • the BS does not need to know the MAC address of the neighboring BS, and only needs to know the IP address of the neighboring BS, so that X2/R8
  • the interface does not need to support VLAN and/or ARP. Since ETH (Ethernet) does not exist, there is no need to parse the ETH frame, which further reduces the transmission delay of the mobile bearer network, thereby reducing the delay of the wireless handover.
  • the OLT also uses ETH.
  • the over GEM mode supports the data packets transmitted by the S1/R6 interface.
  • the VLAN application of the PON system remains unchanged. The VLAN planning is not affected by the local switching function.
  • the OLT does not need to re-plan.
  • the OLT uses the ETH for the user data of the S1/R6 interface.
  • the second layer isolation function remains unchanged.
  • the OLT can also use the Layer 2 forwarding mode to support the data packets transmitted by the S1/R6 interface.
  • the OLT Layer 2 isolation function of the user data of the S1/R6 interface remains unchanged.
  • the above scheme 2 can be applied to a case where a GPON or a next-generation GPON is used as a transmission network.
  • the functional structure diagram of an OLT includes: a PON configuration unit, an IP forwarding unit, and a network side interface processing unit.
  • Functional units such as PON interface unit, signaling processing unit, and MAC forwarding unit. The functions of each functional unit are described below:
  • the PON interface unit is used to implement the PON interface communication function between the OLT and the BS.
  • the PON physical medium correlation layer function and the GPON Transmission Converge (GTC) in the PON protocol stack are completed.
  • EPON and its next-generation EPON the EPON physical layer and data link layer functions are completed.
  • a network side interface processing unit configured to implement a communication function of a network side interface between the OLT and the wireless gateway
  • the PON configuration unit is configured to implement a PON service logical port (such as a GEM Port/LLID port).
  • the foregoing configuration operations include: establishing, modifying, or deleting a PON service logical port and related QoS parameters.
  • the BS is assigned a PON service logical port for X2/R8 interface transmission and a PON service logical port for S1/R6 interface transmission corresponding to the BS's IP address or IPv6 address prefix.
  • a signaling processing unit configured to implement a DHCP snooping function, and establish an IP forwarding table according to the intercepted IP address assigned to the BS and the PON service logical port allocated for the X2/R8 interface allocated by the BS, where the IP is The forwarding table includes: the physical port or the incoming ONU port, the incoming PON service logical port, the outgoing physical port or the outgoing ONU port, the outgoing PON service logical port, and the destination address.
  • the signaling processing unit can also support the ARP Proxy function, and respond to the ARP request from the X2/R8 interface with the MAC address of the OLT to the BS; for the ARP request from the S1/R6 interface, to the wireless gateway (such as the AGW or ASN
  • the MAC address of GW is echoed to the BS.
  • the IP forwarding unit is configured to perform IP forwarding by using an IP forwarding table established by the signaling processing unit based on the PON service logical port, and the IP forwarding is mainly for the data packet transmitted by the X2/R8 interface.
  • the ingress port or egress port of the above IP forwarding unit may be a PON physical port or a network side port.
  • the logical port of the IP forwarding unit may be divided by the ONUs of the same PON physical port.
  • the logical port is called an ONU port, and the ONU port or the outgoing ONU port is identified by the ONU ID.
  • the ONU IDs of different ONUs are different in the same carrier management domain.
  • the business logical port ID is GEM port ID or LLID
  • the ingress port or egress port of the above IP forwarding unit is a network side port, the incoming PON service logical port or the outgoing PON service logical port will be ignored.
  • the ingress port and the egress port of the IP forwarding unit may be the same port, that is, the Layer 3 forwarding in the same PON port is implemented.
  • the logical port of the PON service and the logical port of the P ON service cannot be the same.
  • the three-layer forwarding process performed by the above IP forwarding unit is as follows: [61] When the IP packet transmitted by the X2/R8 interface arrives at the OLT, the IP forwarding unit of the OLT is based on the ingress port of the above IP packet (eg, into the ONU).
  • the MAC forwarding unit is configured to perform MAC forwarding by using a MAC forwarding table based on the PON service logical port, where the MAC forwarding is mainly for the data packet transmitted by the S1/R6 interface.
  • the above MAC forwarding table is established by the MAC self-learning method. If the ingress port or the egress port of the above MAC forwarding unit is a network side port, the inbound or outbound PON service logical port or the outbound PON service logical port may be ignored.
  • the above MAC forwarding table is as shown in Table 2 below.
  • the MAC forwarding unit of the OLT queries according to the ingress port of the MAC frame (such as the ingress network port) and the destination address (such as MAC@1).
  • the functional structure diagram of another OLT provided in this embodiment is shown in FIG. 5, and includes: a GPON interface unit, a network side interface processing unit, an optical network unit management, and a control interface. (ONU Management and Control Interface, OMCl) Configuration unit, signaling processing unit, IP forwarding unit, MAC forwarding unit and other functional units.
  • OMCl ONU Management and Control Interface
  • OMCI configuration unit used to implement configuration GPON service logical port (such as GEM Port/LLID port)
  • the foregoing configuration operations include: establishing, modifying, or deleting a PON service logical port and related QoS parameters.
  • FIG. 6 the functional structure diagram of a BS provided in this embodiment is shown in FIG. 6, and includes: a wireless processing unit, a handover processing unit, a signaling processing unit, a PON interface unit, and a PO.
  • N configuration unit IP forwarding unit, and MAC forwarding unit. The specific functions of each unit are described below.
  • PON interface unit used to implement PON interface communication function between OLT and BS, for GPON and its next-generation GPON, complete PON physical medium correlation layer function and GTC framing sub-layer function in PON protocol stack; EPON and its next-generation EPON complete the EPON physical layer and data link layer functions.
  • the PON configuration unit is configured to implement a PON service logical port (such as a GEM Port/LLID port).
  • the foregoing configuration operations include: establishing, modifying, or deleting a PON service logical port and related QoS parameters.
  • the wireless processing unit is configured to implement a wireless interface communication function between the BS and the user terminal, generate a data packet of the S1/R6 interface, and transmit the data packet to the MAC forwarding unit.
  • the switching processing unit is configured to implement a wireless switching function between the BSs, and generate an IP packet of the X2/R8 interface.
  • the IP packet is transmitted to the IP forwarding unit.
  • the signaling processing unit is configured to implement a DHCP function as a DHCP client, and establish an IP address allocated to the BS according to the DHCP process, and a PON service logical port allocated by the OLT for the X2/R8 interface transmission by the OLT.
  • the IP forwarding table can obtain the PON service logical port corresponding to the X2/R8 message sent by the BS to the OLT according to the IP forwarding table.
  • the signaling processing unit also initiates an ARP request to the MAC forwarding unit to request a MAC address corresponding to the destination IP address of the X2/R8 message.
  • the IP forwarding unit is configured to query, according to the PON service logical port, the IP forwarding table established by the signaling processing unit, and query the PON physical port PON service corresponding to the X2/R8 packet transmitted by the switching processing unit according to the destination IP address. Logical port.
  • the MAC address corresponding to the destination IP address of the X 2/R8 packet is obtained by initiating an ARP request to the MAC forwarding unit. Then, according to the foregoing PON service logical port and MAC address, the X2/R8 message is sent to the OLT through the PON interface unit.
  • the MAC forwarding unit is configured to perform MAC forwarding on the data packet of the S1/R6 interface transmitted by the wireless processing unit or transmitted by the OLT through the MAC forwarding table based on the PON service logical port.
  • the above MA C forwarding table is established by the MAC self-learning method. If the ingress port or the egress port of the above MAC forwarding unit is a user side port (such as a user frequency band or a wireless communication connection), the PON service logical port or the outbound PO N service logical port may be ignored.
  • the above MAC forwarding table can be as shown in Table 3 below.
  • the destination address such as MAC@1
  • the functional structure diagram of another BS provided in this embodiment is as shown in FIG. 7, and includes: an IP forwarding unit, a handover processing unit, and a signaling processing unit, GPON. Interface unit, OMCI configuration unit, wireless processing unit, and MAC forwarding unit. The specific functions of each unit are described below.
  • OMCI configuration unit used to implement configuration GPON service logical port (such as GEM Port/LLID port)
  • GPON interface unit used to implement GPON interface communication function, implements IP over GEM function for GPON service logical port of X2/R8 interface; implements ETH over GEM function for GPON service logical port of S 1/R6 interface.
  • the functions of the radio processing unit, the handover processing unit, the signaling processing unit, the IP forwarding unit, and the MAC forwarding unit in the BS shown in FIG. 7 described above are the same as those of the corresponding units in the BS shown in FIG. 7 described above are the same as those of the corresponding units in the BS shown in FIG. 7 described above are the same as those of the corresponding units in the BS shown in FIG. 7 described above are the same as those of the corresponding units in the BS shown in FIG.
  • the wireless processing unit is configured to implement a wireless interface communication function between the BS and the user terminal, generate a data packet of the S1/R6 interface, and transmit the data packet to the MAC forwarding unit.
  • the switching processing unit is configured to implement a wireless switching function between the BSs, generate an IP packet of the X2/R8 interface, and transmit the IP packet to the IP forwarding unit.
  • Signaling processing unit used as a DHCP client to implement the DHCP function, and obtained according to the DHCP process
  • the signaling processing unit also initiates an ARP request to the MAC forwarding unit to request a MAC address corresponding to the destination IP address of the X2/R8 message.
  • the IP forwarding unit is configured to query, according to the GPON service logical port, the IP forwarding table established by the signaling processing unit, and query the GPON physical port corresponding to the X2/R8 message transmitted by the switching processing unit according to the destination IP address, and GPON. Business logic port.
  • the MAC address corresponding to the destination IP address of the X2/R8 packet is obtained by initiating an ARP request to the MAC forwarding unit. Then, according to the GPON service logical port and the MAC address, the X2/R8 message is sent to the OLT through the GPON interface unit.
  • the MAC forwarding unit is configured to perform MAC forwarding on the data packet of the S1/R6 interface transmitted by the wireless processing unit or transmitted by the OLT through the MAC forwarding table based on the PON service logical port.
  • Step 81 The OLT configures the PON service logical port (such as GEM port/LLID) used by the source BS and the destination BS's DHCP channel.
  • PON service logical port such as GEM port/LLID
  • Step 82 The source BS and the destination BS perform a DHCP address allocation process with the OLT respectively.
  • the source BS and the destination BS respectively request an IP address or an IPv6 address prefix from the DHCP server, and the DHCP server performs a DHCP address allocation or an address prefix delegation process to assign an IP address or an IP address to the source BS and the destination BS, respectively.
  • IPv6 address prefix assigns IPv6 address to different BSs to different BSs.
  • IPv6 address prefix assigned by the DHCP server to different BSs is also different.
  • Step 83 The OLT implements the DHCP relay function to transfer DHCP messages to listen to DHCP packets between the source BS and the destination BS and the DHCP server.
  • Step 84 The OLT configures, by using the OMCI protocol, the PON service logical port for the X2/R8 interface corresponding to the IP address or the IP v6 address prefix obtained by the source BS and the destination BS, and the S1/R6 interface.
  • Step 85 The OLT (or its integrated ONU) allocates an IP address or an IPv6 address prefix allocated to the source BS and the destination BS according to the DHCP snooping, and is configured for the source BS and the destination BS according to the OLT for X2. ID of the logical port of the PON service on the /R 8 interface, and establish a corresponding IP forwarding table.
  • the IP forwarding table includes : Incoming physical port or incoming optical network unit ONU port, incoming PON service logical port, destination address or destination address prefix, outgoing physical port or outgoing ONU port, and outgoing PON service logical port.
  • a data forwarding process for implementing local exchange of an OLT according to this embodiment is as shown in FIG. 9, and includes the following processing steps:
  • Step 91 The BS initiates an ARP request message to the OLT by using a PON service logical port for the X2/R8 interface transmission.
  • Step 92 The OLT identifies that the ARP request message is from X2 according to the logical port identifier of the PON service.
  • the ARP reply message is replied to the BS with the MAC address of the OLT.
  • Step 93 The BS initiates an ARP request message to the OLT through the PON service logical port used for the S1/R6 interface transmission.
  • Step 94 The OLT identifies that the ARP request message is from S1/ according to the logical port identifier of the PON service.
  • the ARP reply message is replied to the BS by the MAC address of the wireless gateway, and the above wireless gateway may be an access gateway (AGW).
  • AGW access gateway
  • Step 95 When the user terminal has a radio cell handover, the BS receives a request to transfer the user data buffered at the source base station from the X2/R8 interface to the destination base station.
  • Step 96 The source base station encapsulates the packet of the X2/R8 interface into the corresponding GEM for X2/R8 interface transmission.
  • Step 97 The source base station sends the encapsulated X2/R8 interface packet to the OLT.
  • the encapsulated X2/R8 interface can pass the IP over
  • GEM is sent to the OLT.
  • Step 98 The OLT queries the IP forwarding table according to the destination IP address (which may also include DSCP) of the received X2/R8 interface packet, the physical port or the incoming ONU port, and the PON service logical port. Obtaining the physical port of the data packet, the outgoing ONU port, and the outgoing PON service logical port, and forwarding the data packet to the destination BS by using the outgoing physical port or the outgoing ONU port and the outgoing PON service logical port.
  • the destination IP address which may also include DSCP
  • Step 99 The OLT encapsulates the received packet of the X2/R8 interface into the PON frame of the PON service logical port obtained by the query.
  • Step 910 The OLT sends the encapsulated X2/R8 interface packet to the destination BS from the corresponding egress port.
  • the encapsulated X2/R8 interface can pass the IP over GEM. Way To the BS.
  • Step 911 For the packet of the S1/R6 interface, the BS encapsulates the PON frame into the corresponding PON service logical port for the S1/R6 interface transmission. The BS sends the encapsulated S1/R6 interface to the OLT. For GP ON and the next-generation GPON, the S1/R6 packet can be sent to the OLT through ETH over GEM.
  • the OLT forwards the packet of the received S1/R6 interface to the AGW.
  • the present invention can be implemented by hardware, or can be realized by means of software plus necessary general hardware platform, the present invention.
  • the technical solution can be embodied in the form of a software product, which can be stored in a computer readable storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), and includes a plurality of instructions for making a computer device (may be a personal computer, server, or network device, etc.) Perform the methods described in various embodiments of the present invention.

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Abstract

本发明提供了一种支持基站数据交换的装置、系统及方法。该方法主要包括:预先建立IP转发表,接收源BS发送的数据报文;根据所述数据报文的目的IP地址、入物理端口或入ONU端口、和入PON业务逻辑端口,查询所述IP转发表,获取所述数据报文的出物理端口、出PON业务逻辑端口,利用所述出物理端口或出ONU端口、出PON业务逻辑端口将所述数据报文转发给目的BS。利用本发明,实现了作为传输网络的PON网络支持X2接口,实现BS之间真正意义上的直接互通,而不是通过无线网关互通。

Description

说明书
Title of Invention:支持基站数据交换的装置、 系统及方法
[1] 本申请要求了 2008年 11月 18日提交的、 申请号为 200810226397.0、 发明名称为" 支持基站数据交换的装置、 系统及方法"的中国申请的优先权, 其全部内容通过 引用结合在本申请中。
[2] 技术领域
[3] 本发明涉及无线通信技术领域, 尤其涉及一种支持基站数据交换的装置、 系统 及方法。
[4] 发明背景
[5] 长期演进 (Long Term Evolution, LTE) 网络的架构图如图 1所示, LTE网络釆 用两层扁平网络结构, 其中移动管理实体 (Mobility Management Entity, MME
) 管理控制面的协议, 如用户终端标识的分配、 安全性、 鉴权和漫游控制等; 服务网关 (Serving Gateway, S-GW) 管理用户面的协议, 如储存用户终端上下 文、 加密上下文等。
[6] 在通用地面无线接入网路 (Universal Terrestrial Radio Access Network
, E-UTRAN) 的结构中, 增强节点 B (enhanced NodeB , eNB) 之间釆用 X2接 口, 用于传输切换数据包; 在 eNB和 A-GW之间釆用 S1接口。 LTE网络对移动承 载网络的吋延要求非常高, 要求端到端吋延小于 10毫秒。
[7] 微波接入全球互联 (World Interoperability for Microwave Access , WiMAX) 的 网络架构类似 LTE网络, WiMAX的接入网釆用两级结构, 由基站 (Base Station , BS) 和接入网网关 (Access Service Network Gateway, ASN GW) 构成; 其中 , BS对应于 eNB , 接入服务网络网关 (Access Service Network Gateway, A-GW ) 对应于 A-GW; BS之间釆用 R8接口, 用于传输切换数据包; 在 BS和 ASN GW 之间釆用 R6接口。
[8] 对于千兆位无源光网络 (Gigabit Passive Optical
Network, GPON) 及下一代 GPON, PON业务逻辑传输管道为 GEM
port, 釆用 GPON封装方式 (GPON Encapsulation Method, GEM) port-ID进行标 识。 对于以太无源光网络 (Ethernet Passive Optical
Network, EPON) 及下一代 EPON, PON业务逻辑传输管道为逻辑链路标识 (Lo gical Link Identifier, LLID) 管道, 釆用 LLID进行标识。 目前, PON的主要业务 承载方式有 Ethernet over GEM (以太网承载于 GEM) 和 IP over
GEM (IP承载于 GEM) 。
当釆用 PON网络, 比如 GPON (或 EPON) 或下一代 GPON (或 EPON) 作为上 述 U-TRAN网络或 WiMAX网络的传输网络吋, 基于 PON的移动承载示意图如图 2 所示, 光路终结点 (Optical Line Termination, OLT) 当收到来自 BS1的数据包, 只能将该数据包继续上传给无线网关, 再由无线网关将该数据包转发给 BS2, 相 当于该 PON网络只能支持 S1接口 (BS和无线网关之间的接口) , 不能支持 X2接 口 (BS之间的接口) 。
如何使作为传输网络的上述 PON网络支持 X2接口, 实现 BS之间真正意义上的 直接互通, 而不是通过无线网关互通, 是基于 PON网络的移动承载急待解决的 问题。
发明内容
本发明的实施例提供了一种支持基站数据交换的装置、 系统及方法, 以解决作 为传输网络的 PON网络支持 X2接口的问题。
本发明的目的是通过以下技术方案实现的:
一种支持基站数据交换的光路终结点 OLT, 包括:
无源光网络 PON配置单元, 用于给基站 BS分配与 BS的 IP地址相对应的 PON业 务逻辑端口, 所述 PON业务逻辑端口包括入 PON业务逻辑端口和出 PON业务逻 辑端口, 用于与所述 BS中的 BS间通信接口交互数据报文;
IP转发单元, 用于通过所述 PON业务逻辑端口接收源 BS发送的数据报文, 根据 该数据报文的目的 IP地址、 入物理端口或入光网络单元 ONU端口、 入 PON业务 逻辑端口, 査询预先建立的 IP转发表, 获取所述数据报文的出物理端口或出 ON U端口、 出 PON业务逻辑端口, 利用所述出物理端口或出 ONU端口、 出 PON业务 逻辑端口将所述数据报文转发给目的 BS。
一种基站 BS, 包括: [18] 切换处理单元, 用于生成 BS间传输的数据报文, 将该数据报文传输给 IP转发单 元;
[19] 所述 IP转发单元, 用于根据所述切换处理单元传输过来的数据报文的目的 IP地 址, 査询预先建立的 IP转发表, 获取所述数据报文对应的出 PON业务逻辑端口, 并通过该出 PON业务逻辑端口将所述数据报文发送给 OLT。
[20] 一种支持基站数据交换的系统, 包括 OLT、 源 BS和目的 BS, 其中,
[21] 所述源 BS, 用于生成所述源 BS和所述目的 BS间传输的数据报文, 根据该数据 报文的目的 IP地址, 査询预先建立的 IP转发表, 获取所述数据报文对应的出 PON 业务逻辑端口, 并通过该出 PON业务逻辑端口将所述数据报文发送给 OLT;
[22] 所述 OLT, 用于接收源 BS发送的数据报文, 根据该数据报文的目的 IP地址、 入 物理端口或入光网络单元 ONU端口、 和入 PON业务逻辑端口, 査询预先建立的 I P转发表, 获取所述数据报文的出物理端口或出 ONU端口、 出 PON业务逻辑端口 , 利用所述出物理端口或出 ONU端口、 出 PON业务逻辑端口将所述数据报文转 发给所述目的 BS。
[23] 一种基站数据交换的方法, 预先建立 IP转发表, 所述方法具体包括:
[24] 接收源 BS发送的数据报文;
[25] 根据所述数据报文的目的 IP地址、 入物理端口或入 ONU端口、 和入 PON业务逻 辑端口, 査询所述 IP转发表, 获取所述数据报文的出物理端口、 出 PON业务逻辑 端口, 利用所述出物理端口或出 ONU端口、 出 PON业务逻辑端口将所述数据报 文转发给目的 BS。
[26] 由上述本发明的实施例提供的技术方案可以看出, 本发明实施例通过 OLT支持 X2/R8 (BS之间的接口) 、 S1/R6 (BS和 ASN GW之间的接口) 接口传输的数据 报文, 通过 DHCP侦听基于建立 BS的 IP地址与用于 X2/R8接口传输的 PON业务逻 辑端口的 IP转发表, 利用该 IP转发表实现了基站数据的本地交换, 实现 BS之间 的互通。
[27] 附图简要说明
[28] 图 1为现有技术中的一种 LTE网络的架构示意图;
[29] 图 2为现有技术中的一种基于 PON的移动承载示意图; [30] 图 3为本发明实施例-一提供的一种支持 OLT本地交换的 PON系统的结构示意图
[31] 图 4为本发明实施例.二提供的一种 OLT的功能结构示意图;
[32] 图 5为本发明实施例.二提供的另一种 OLT的功能结构示意图;
[33] 图 6为本发明实施例.二提供的一种 BS的功能结构示意图;
[34] 图 7为本发明实施例.二提供的另一种 BS的功能结构示意图;
[35] 图 8为本发明实施例.三提供的信令处理单元建立 X2/R8接口的 IP转发表的处理流 程图;
[36] 图 9为本发明实施例.三提供的一种实现 OLT本地交换的数据转发流程图。
[37] 实施本发明的方式
[38] 本发明实施例中, OLT给 BS分配与 BS的 IP地址相对应的 PON业务逻辑端口, 所述 PON业务逻辑端口包括入 PON业务逻辑端口和出 PON业务逻辑端口, 用于 与所述 BS中的 BS间通信接口交互数据报文。
[39] OLT通过所述入 PON业务逻辑端口接收源 BS发送的数据报文, 根据所述数据报 文的目的 IP地址、 入物理端口或入光网络单元 (optical network
unit, ONU) ONU端口、 入 PON业务逻辑端口, 査询预先建立的 IP转发表, 获取 所述数据报文的出物理端口或出 ONU端口、 出 PON业务逻辑端口, 利用所述出 物理端口或出 ONU端口、 出 PON业务逻辑端口将所述数据报文转发给目的 BS。
[40] 为便于对本发明实施例的理解, 下面将结合附图以几个具体实施例为例做进一 步的解释说明, 且各个实施例并不构成对本发明实施例的限定。
[41] 实施例一
[42] 该实施例提供的一种支持 OLT本地交换的 PON系统的结构示意图如图 3所示。
[43] 在图 3所示的 PON系统中, OLT支持 X2/R8、 S1/R6接口传输的数据报文, 给 BS 分配用于 X2/R8、 S1/R6接口传输的 PON业务逻辑端口。 OLT支持动态主机配置 协议 (Dynamic Host Configuration Protocol, DHCP) 侦听, 通过 DHCP侦听分配 给 BS的 IP地址, 建立基于 BS的 IP地址与 PON业务逻辑端口的 IP转发表, 所述 P0 N业务逻辑端口包括入 P0N业务逻辑端口和出 P0N业务逻辑端口, 从而实现基站 数据的本地交换, 以支持 X2/R8接口。 此外, OLT釆用二层转发方式支持 S1/R6 接口传输的数据报文, OLT对 S1/R6接口的用户数据的二层业务隔离功能保持不 变。 BS可以内嵌 ONT, 不同 BS对应不同的 ONT ID, 该 ONT ID可以作为 BS ID使 用。
[44] 在实际应用中, OLT可以通过下述两种方案来实现支持 X2/R8、 S1/R6接口传输 的数据报文:
[45] 方案 1、 OLT釆用三层转发方式支持 X2/R8接口传输的数据报文, X2/R8接口传 输的数据报文釆用特定的虚拟局域网 (Virtual Local Area Network, VLAN) 标 识; OLT还釆用二层转发方式支持 S1/R6接口传输的数据报文; 此外, OLT还支 持地址解析协议代理 (Address Resolution Protocol Proxy, ARP Proxy) ' 对于来 自 X2/R8接口的地址解析协议 (Address Resolution Protocol, ARP) 请求' ARP Proxy以 OLT的媒质接入控制层 (Mdium Access Control, MAC) 地址回应给 BS ; 对于来自 S1/R6接口的 ARP请求, ARP Proxy以无线网关 (如 AGW或 ASN GW ) 的 MAC地址回应给 BS。
[46] 上述方案 1可以应用于 GPON、 EPON、 下一代 GPON或下一代 EPON作为传输网 络的情况。
[47] 方案 2、 OLT釆用 IP over GEM方式支持 X2/R8接口传输的数据报文, BS无需知 道相邻 BS的 MAC地址, 只需知道相邻 BS的 IP地址即可, 从而 X2/R8接口无需支 持 VLAN和 /或 ARP, 由于 ETH (Ethernet, 以太网) 不存在, 无需解析 ETH帧, 进一步降低了移动承载网的传输吋延, 进而降低了无线切换的吋延; OLT还釆用 ETH over GEM方式支持 S1/R6接口传输的数据报文, PON系统的 VLAN应用保持 不变, VLAN规划不受本地交换功能引入的影响, 不需重新规划, OLT对 S1/R6 接口的用户数据的 ETH二层隔离功能保持不变。 OLT还可以釆用二层转发方式, 支持 S1/R6接口传输的数据报文, OLT对 S1/R6接口的用户数据的 ETH二层隔离功 能保持不变。
[48] 上述方案 2可以应用于 GPON或下一代 GPON作为传输网络的情况。
[49] 实施例二
[50] 针对上述实施一中的方案 1, 该实施例提供的一种 OLT的功能结构图如图 4所示 , 包括: PON配置单元、 IP转发单元, 进一步地, 还包括网络侧接口处理单元 、 PON接口单元、 信令处理单元、 MAC转发单元等功能单元, 下面分别介绍各 个功能单元的作用:
PON接口单元, 用于实现 OLT和 BS之间的 PON接口通信功能, 对于 GPON及其 下一代 GPON, 完成 PON协议栈中的 PON物理媒质相关层功能和 GPON传输汇聚 层 (GPON Transmission Converge, GTC) 成帧子层功能; 对于 EPON及其下一 代 EPON, 完成 EPON物理层和数据链路层功能。
网络侧接口处理单元, 用于实现 OLT和无线网关之间的网络侧接口的通信功能
PON配置单元, 用于实现配置 PON业务逻辑端口 (如 GEM Port/LLID端口) , 上述配置操作包括: 建立、 修改或删除 PON业务逻辑端口及其相关 QoS参数。 给 BS分配与 BS的 IP地址或 IPv6地址前缀相对应的用于 X2/R8接口传输的 PON业务逻 辑端口和用于 S1/R6接口传输的 PON业务逻辑端口。
信令处理单元, 用于实现 DHCP侦听功能, 并根据侦听得到的分配给 BS的 IP地 址和为 BS分配的用于 X2/R8接口传输的 PON业务逻辑端口建立 IP转发表, 所述 IP 转发表中包括: 入物理端口或入 ONU端口、 入 PON业务逻辑端口、 出物理端口 或出 ONU端口、 出 PON业务逻辑端口和目的地址。 另外, 该信令处理单元还可 支持 ARP Proxy功能, 对于来自 X2/R8接口的 ARP请求, 以 OLT的 MAC地址回应 给 BS; 对于来自 S1/R6接口的 ARP请求, 以无线网关 (如 AGW或 ASN
GW) 的 MAC地址回应给 BS。
上述 IP转发表如下述表 1所示。
表 1
Figure imgf000009_0001
[58] IP转发单元, 用于基于 PON业务逻辑端口, 通过信令处理单元建立的 IP转发表 进行 IP转发, 该 IP转发主要针对 X2/R8接口传输的数据报文。 上述 IP转发单元的 入端口或出端口可为 PON物理端口、 网络侧端口。 当所述 OLT集成了 ONU吋, 也可按同一 PON物理端口下的不同 ONU划分上述 IP转发单元的逻辑端口, 该逻 辑端口称为 ONU端口, 入 ONU端口或出 ONU端口用 ONU ID进行标识。 在同一个 运营商管理域内, 不同 ONU的 ONU ID不同。 业务逻辑端口标识为 GEM port ID 或 LLID
[59] 若上述 IP转发单元的入端口或出端口为网络侧端口, 则入 PON业务逻辑端口或 出 PON业务逻辑端口将被忽略。 上述 IP转发单元的入端口和出端口可以为同一个 端口, 即实现在同一个 PON端口内的三层转发, 此吋入 PON业务逻辑端口和出 P ON业务逻辑端口不能相同。
[60] 以 GPON为例, 上述 IP转发单元完成的三层转发过程如下: [61] 当 X2/R8接口传输的 IP分组到达 OLT吋, OLT的 IP转发单元根据上述 IP分组的入 端口 (如入 ONU
ID=1) 、 入 PON业务逻辑端口 (如 GPID=1) 和目的地址 (如 IP@ 1) , 査询上述 表 1所示的 IP转发表, 得到出端口 (如出 ONU
ID=2) 和出 PON业务逻辑端口 (如 GPID=k) , 则 PON接口单元对 IP分组添加 GE M帧头, 该 GEM帧头中的 GEM PORT ID为査询得到的出 PON业务逻辑端口值 ( 如如 GPID=k) , 然后将 GEM帧由出端口 (如出 ONU ID=2) 送出。
[62] MAC转发单元, 用于基于 PON业务逻辑端口, 通过 MAC转发表进行 MAC转发 , 该 MAC转发主要针对 S1/R6接口传输的数据报文。 上述 MAC转发表釆用 MAC 自学习的方法建立。 若上述 MAC转发单元的入端口或出端口为网络侧端口, 贝 IJ 入 PON业务逻辑端口或出 PON业务逻辑端口可被忽略。 上述 MAC转发表如下述 表 2所示。
[63] 表 2 : PON— based MAC转发表
[64]
Figure imgf000010_0001
[65] 上述 MAC转发的具体处理过程如下:
[66] 在上行方向, 当 S1/R6接口传输的 MAC帧到达 OLT吋, OLT的 MAC转发单元根 据 MAC帧的入端口 (如入 ONU ID=l) 、 入 PON业务逻辑端口 (如 GPID=n) 和 目的地址 (如 MAC@ 1) , 査询上述表 2所示的 MAC转发表, 得到出端口 (如出 网络侧端口) , 然后, 通过该出端口 (如出网络侧端口) 将上述 MAC帧送出。 [67] 在下行方向, 当 S1/R6接口传输的 MAC帧到达 OLT吋, OLT的 MAC转发单元根 据 MAC帧的入端口 (如入网络侧端口) 和目的地址 (如 MAC@ 1) , 査询上述 表 2所示的 MAC转发表, 得到出端口 (如出 ONU ID=2) 、 出 PON业务逻辑端口 (如 GPID=m) , 贝 Ι」ΡΟΝ接口单元将 MAC帧添加 GEM帧头, 该 GEM帧头中的 GE
M PORT ID为査得的出 PON业务逻辑端口值 (如如 GPID=m) , 然后, 通过该出 端口 (如出 ONU ID=2) 将上述 MAC帧送出。
[68] 针对上述实施一中的方案 2, 该实施例提供的另一种 OLT的功能结构图如图 5所 示, 包括: GPON接口单元、 网络侧接口处理单元、 光网络单元管理和控制接口 (ONU Management and Control Interface, OMCl) 配置单元、 信令处理单元、 IP 转发单元、 MAC转发单元等功能单元, 下面分别介绍各个功能单元的作用: [69] GPON接口单元, 用于实现 OLT和 BS之间的 GPON接口通信功能。 对于 X2/R8 接口的 PON业务逻辑端口, 实现 IP over GEM功能; 对于 S 1/R6接口的 PON业务逻 辑端口 ' 实现 ETH over GEM功能。
[70] OMCI配置单元, 用于实现配置 GPON业务逻辑端口 (如 GEM Port/LLID端口)
, 上述配置操作包括: 建立、 修改或删除 PON业务逻辑端口及其相关 QoS参数。
[71] 上述图 5所示的 OLT中的网络侧接口处理单元、 信令处理单元、 IP转发单元和 M
AC转发单元的功能上述图 4所示的 OLT中的对应单元的功能相同。
[72] 针对上述实施一中的方案 1, 该实施例提供的一种 BS的功能结构示意图如图 6所 示, 包括: 无线处理单元、 切换处理单元、 信令处理单元、 PON接口单元、 PO
N配置单元、 IP转发单元和 MAC转发单元。 下面分别介绍各个单元的具体功能。
[73] PON接口单元, 用于实现 OLT和 BS之间的 PON接口通信功能, 对于 GPON及其 下一代 GPON, 完成 PON协议栈中的 PON物理媒质相关层功能和 GTC成帧子层功 能; 对于 EPON及其下一代 EPON, 完成 EPON物理层和数据链路层功能。
[74] PON配置单元, 用于实现配置 PON业务逻辑端口 (如 GEM Port/LLID端口) , 上述配置操作包括: 建立、 修改或删除 PON业务逻辑端口及其相关 QoS参数。
[75] 无线处理单元, 用于实现 BS和用户终端之间的无线接口通信功能, 生成 S1/R6 接口的数据报文, 将该数据报文传输给 MAC转发单元。
[76] 切换处理单元, 用于实现 BS之间的无线切换功能, 生成 X2/R8接口的 IP报文, 将该 IP报文传输给 IP转发单元。
[77] 信令处理单元, 用于作为 DHCP Client实现 DHCP功能, 并根据 DHCP过程得到 的分配给 BS的 IP地址, 以及 OLT为 BS分配的用于 X2/R8接口传输的 PON业务逻辑 端口, 建立 IP转发表, 根据该 IP转发表可以得到 BS发送给 OLT的 X2/R8报文对应 的 PON业务逻辑端口。 该信令处理单元还向 MAC转发单元发起 ARP请求, 请求 X 2/R8报文的目的 IP地址所对应的 MAC地址。
[78] IP转发单元, 用于基于 PON业务逻辑端口, 通过信令处理单元建立的 IP转发表 , 根据目的 IP地址査询切换处理单元传输过来的 X2/R8报文对应的 PON物理端口 PON业务逻辑端口。 可选地, 通过向 MAC转发单元发起 ARP请求, 获取上述 X 2/R8报文的目的 IP地址所对应的 MAC地址。 然后, 根据上述 PON业务逻辑端口 和 MAC地址, 将上述 X2/R8报文通过 PON接口单元发送给 OLT
[79] MAC转发单元, 用于基于 PON业务逻辑端口, 通过 MAC转发表对无线处理单 元传输过来或者 OLT传输过来的 S1/R6接口的数据报文进行 MAC转发。 上述 MA C转发表釆用 MAC自学习的方法建立。 若上述 MAC转发单元的入端口或出端口 为用户侧端口 (如用户频段或无线通信连接) , 则入 PON业务逻辑端口或出 PO N业务逻辑端口可被忽略。 上述 MAC转发表可以如下述表 3所示。
[80] 表 3 MAC转发表
[81] 入端口 入业 目的地 VLAN出端 出业务逻辑端口
/ONT 务逻 址 /目的 标识 口 /ON
P ¾¾ 地址前 T端口
P 缀
ONT 1 n MAC VLAN用户
@ 1 1 侧端
P
用户侧 ― MAC VLAN ONT 2 m
端口 @2 2 [82] 上述 MAC转发的具体处理过程如下:
[83] 在上行方向, 当无线处理单元传输过来的 S1/R6接口的数据报文的 MAC帧到达 该单元吋, 该单元根据 MAC帧的入端口 (如入 ONT ID=l) 、 入 PON业务逻辑端 口 (如 GPID=n) 和目的地址 (如 MAC@ 1) , 査询上述表 3所示的 MAC转发表, 得到出端口 (如出用户侧端口) , 然后, 通过该出端口 (如出用户侧端口) 将 上述 MAC帧通过 PON接口单元发送给 OLT。
[84] 在下行方向, 当 OLT传输过来的 S1/R6接口的数据报文的 MAC帧到达该单元吋 , 该单元根据 MAC帧的入端口 (如入用户侧端口) 和目的地址 (如 MAC@ 1) , 査询上述表 3所示的 MAC转发表, 得到出端口 (如出 ONT ID=2) 、 出 PON业 务逻辑端口 (如 GPID=m) , 贝 Ι」ΡΟΝ接口单元将 MAC帧添加 GEM帧头, 该 GEM 帧头中的 GEM PORT ID为査得的出 PON业务逻辑端口值 (如如 GPID=m) , 然 后, 通过该出端口 (如出 ONT ID=2) 将上述 MAC帧送出。
[85] 针对上述实施一中的方案 2, 该实施例提供的另一种 BS的功能结构示意图如图 7 所示, 包括: IP转发单元、 切换处理单元, 还可以包括信令处理单元、 GPON接 口单元、 OMCI配置单元、 无线处理单元和 MAC转发单元。 下面分别介绍各个单 元的具体功能。
[86] OMCI配置单元, 用于实现配置 GPON业务逻辑端口 (如 GEM Port/LLID端口)
, 如建立、 修改或删除 PON业务逻辑端口及其相关 QoS参数。
[87] GPON接口单元, 用于实现 GPON接口通信功能, 对于 X2/R8接口的 GPON业务 逻辑端口, 实现 IP over GEM功能; 对于 S 1/R6接口的 GPON业务逻辑端口, 实现 ETH over GEM功能。
[88] 上述图 7所示的 BS中的无线处理单元、 切换处理单元、 信令处理单元、 IP转发 单元和 MAC转发单元的功能上述图 6所示的 BS中的对应单元的功能相同。
[89] 无线处理单元, 用于实现 BS和用户终端之间的无线接口通信功能, 生成 S1/R6 接口的数据报文, 将该数据报文传输给 MAC转发单元。
[90] 切换处理单元, 用于实现 BS之间的无线切换功能, 生成 X2/R8接口的 IP报文, 将该 IP报文传输给 IP转发单元。
[91] 信令处理单元, 用于作为 DHCP Client实现 DHCP功能, 并根据 DHCP过程得到 的分配给 BS的 IP地址, 以及 OLT为 BS分配的用于 X2/R8接口传输的 GPON业务逻 辑端口, 建立 IP转发表, 根据该 IP转发表可以得到 BS发送给 OLT的 X2/R8报文对 应的 GPON业务逻辑端口。 该信令处理单元还向 MAC转发单元发起 ARP请求, 请 求 X2/R8报文的目的 IP地址所对应的 MAC地址。
[92] IP转发单元, 用于基于 GPON业务逻辑端口, 通过信令处理单元建立的 IP转发 表, 根据目的 IP地址査询切换处理单元传输过来的 X2/R8报文对应的 GPON物理 端口、 GPON业务逻辑端口。 可选地, 通过向 MAC转发单元发起 ARP请求, 获取 上述 X2/R8报文的目的 IP地址所对应的 MAC地址。 然后, 根据上述 GPON业务逻 辑端口和 MAC地址, 将上述 X2/R8报文通过 GPON接口单元发送给 OLT。
[93] MAC转发单元, 用于基于 PON业务逻辑端口, 通过 MAC转发表对无线处理单 元传输过来或者 OLT传输过来的 S1/R6接口的数据报文进行 MAC转发。
[94] 实施例三
[95] 该实施例提供的上述实施例二中的信令处理单元建立 X2/R8接口的 IP转发表的 处理流程如图 8所示, 包括如下处理步骤:
[96] 步骤 81、 OLT分别配置源 BS和目的 BS的 DHCP通道所用的 PON业务逻辑端口 ( 如 GEM port/LLID) 。
[97] 步骤 82、 源 BS和目的 BS分别与 OLT之间进行 DHCP地址分配过程。
[98] 源 BS和目的 BS分别向 DHCP服务器请求 IP地址或 IPv6地址前缀, DHCP服务器 进行 DHCP地址分配或地址前缀委派过程, 给源 BS和目的 BS分别分配 IP地址或 IP
^6地址前缀。 通常 DHCP服务器分配给不同 BS的 IPv6地址前缀也不同。
[99] 步骤 83、 OLT实现 DHCP Relay功能中转 DHCP消息, 对源 BS和目的 BS与 DHCP 服务器之间的 DHCP报文进行侦听。
[100] 步骤 84、 OLT通过 OMCI协议, 分别配置与源 BS和目的 BS所获得的 IP地址或 IP v6地址前缀相对应的用于 X2/R8接口的 PON业务逻辑端口和用于 S1/R6接口的 PO
N业务逻辑端口。
[101] 步骤 85、 OLT (或其内部集成的 ONU) 根据 DHCP侦听得到的分配给源 BS和目 的 BS的 IP地址或 IPv6地址前缀, 以及根据 OLT为源 BS和目的 BS配置的用于 X2/R 8接口的 PON业务逻辑端口的标识, 建立相应的 IP转发表。 所述 IP转发表中包括 : 入物理端口或入光网络单元 ONU端口、 入 PON业务逻辑端口、 目的地址或目 的地址前缀、 出物理端口或出 ONU端口、 以及出 PON业务逻辑端口。
[102] 该实施例提供的一种实现 OLT本地交换的数据转发流程如图 9所示, 包括如下 处理步骤:
[103] 步骤 91、 BS通过用于 X2/R8接口传输的 PON业务逻辑端口向 OLT发起 ARP请求 消息。
[104] 步骤 92、 OLT根据 PON业务逻辑端口标识, 识别出上述 ARP请求消息是来自 X2
/R8接口, 则以 OLT的 MAC地址回复 ARP应答消息给 BS。
[105] 步骤 93、 BS通过用于 S1/R6接口传输的 PON业务逻辑端口向 OLT发起 ARP请求 消息。
[106] 步骤 94、 OLT根据 PON业务逻辑端口标识, 识别出上述 ARP请求消息是来自 S1/
R6接口, 则以无线网关的 MAC地址回复 ARP应答消息给 BS, 上述无线网关可以 为接入网关 (Access Gateway, AGW) °
[107] 步骤 95、 当用户终端发生无线小区切换吋, BS收到将缓存在源基站的用户数据 由 X2/R8接口转移到目的基站的要求。
[108] 步骤 96、 源基站将 X2/R8接口的报文封装入相应的用于 X2/R8接口传输的 GEM
PORT的 PON帧。
[109] 步骤 97、 源基站将上述封装后的 X2/R8接口的报文发送至 OLT, 对于 GPON及 下一代 GPON, 上述封装后的 X2/R8接口的报文可通过 IP over
GEM方式发送至 OLT。
[110] 步骤 98、 OLT根据接收的 X2/R8接口的报文的目的 IP地址 (还可包含 DSCP) 、 入物理端口或入 ONU端口、 入 PON业务逻辑端口, 査询所述 IP转发表, 获取所 述数据报文的出物理端口或出 ONU端口、 出 PON业务逻辑端口, 利用所述出物 理端口或出 ONU端口、 出 PON业务逻辑端口将所述数据报文转发给目的 BS。
[111] 步骤 99、 OLT将接收的 X2/R8接口的报文封装入査询得到的 PON业务逻辑端口 的 PON帧。
[112] 步骤 910、 OLT将封装后的 X2/R8接口的报文从相应的出端口发至目的 BS, 对 于 GPON及下一代 GPON, 封装后的 X2/R8接口的报文可通过 IP over GEM方式发 至 BS。
[113] 步骤 911、 对于 S1/R6接口的报文, BS将其封装入相应的用于 S1/R6接口传输的 PON业务逻辑端口的 PON帧。 BS将封装后的 S 1/R6接口的报文发至 OLT, 对于 GP ON及下一代 GPON, S1/R6报文可通过 ETH over GEM方式发至 OLT。
[114] OLT对接收的 S 1/R6接口的报文进行 MAC转发, 发往 AGW。
[115] 其中, 上述步骤 91和 92仅针对上述实施例一中的方案 1, 上述实施例一中的方 案 2无需用到上述步骤 91和 92。
[116] 通过以上的实施方式的描述, 本领域的技术人员可以清楚地了解到本发明可以 通过硬件实现, 也可以可借助软件加必要的通用硬件平台的方式来实现基于这 样的理解, 本发明的技术方案可以以软件产品的形式体现出来, 该软件产品可 以存储在一个计算机可读存储介质 (可以是 CD-ROM, U盘, 移动硬盘等) 中, 包括若干指令用以使得一台计算机设备 (可以是个人计算机, 服务器, 或者网 络设备等) 执行本发明各个实施例所述的方法。
[117] 以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并不局限于 此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到 的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围 应该以权利要求的保护范围为准。

Claims

权利要求书
[Claim 1] 一种支持基站数据交换的光路终结点 OLT, 其特征在于, 包括: 无源光网络 PON配置单元, 用于给基站 BS分配与 BS的 IP地址相对 应的 PON业务逻辑端口, 所述 PON业务逻辑端口包括入 PON业务 逻辑端口和出 PON业务逻辑端口, 用于与所述 BS中的 BS间通信接 口交互数据报文;
IP转发单元, 用于通过所述 PON业务逻辑端口接收源 BS发送的数 据报文, 根据该数据报文的目的 IP地址、 入物理端口或入光网络 单元 ONU端口、 入 PON业务逻辑端口, 査询预先建立的 IP转发表 , 获取所述数据报文的出物理端口或出 ONU端口、 出 PON业务逻 辑端口, 利用所述出物理端口或出 ONU端口、 出 PON业务逻辑端 口将所述数据报文转发给目的 BS。
[Claim 2] 根据权利要求 1所述的支持基站数据交换的光路终结点 OLT, 其特 征在于, 所述 OLT还包括:
信令处理单元, 用于实现动态主机配置协议 DHCP侦听功能, 并根 据 DHCP侦听得到的 BS的 IP地址和所述 PON业务逻辑端口建立 IP转 发表, 所述 IP转发表中包括: 入物理端口或入 ONU端口、 入 PON 业务逻辑端口、 目的 IP地址或目的地址前缀、 出物理端口或出 ON U端口、 和出 PON业务逻辑端口。
[Claim 3] 根据权利要求 1所述的支持基站数据交换的光路终结点 OLT, 其特 征在于, 所述 OLT还包括:
媒质接入控制层 MAC转发单元, 用于通过自学习建立基于 BS的 IP 地址、 所述 PON配置单元分配的用于与所述 BS中的 BS和无线网关 间通信接口交互数据报文的 PON业务逻辑端口的 MAC转发表, 所 述 PON业务逻辑端口包括入 PON业务逻辑端口和出 PON业务逻辑 端口;
所述 MAC转发单元, 还用于接收源 BS发送的数据报文, 根据该数 据报文的目的 IP地址、 入物理端口或入 ONU端口、 和入 PON业务 逻辑端口, 査询所述 MAC转发表, 获取所述数据报文的出物理端 口或出 ONU端口、 出 PON业务逻辑端口, 利用所述出物理端口或 出 ONU端口、 出 PON业务逻辑端口将所述数据报文转发给无线网 关。
根据权利要求 1或 2或 3所述的支持基站数据交换的光路终结点 OLT , 其特征在于, 所述 OLT还包括:
PON接口单元, 用于实现 OLT和 BS之间的 PON接口通信功能; 网络侧接口处理单元, 用于实现 OLT和无线网关之间的网络侧接 口的通信功能。
根据权利要求 4所述的支持基站数据交换的光路终结点 OLT, 其特 征在于:
所述信令处理单元, 还支持地址解析协议代理 ARP Proxy功能, 对 于来自 BS之间的通信接口的 ARP请求, 返回 OLT的 MAC地址作为 应答; 对于来自 BS和无线网关之间的通信接口的 ARP请求, 返回 无线网关的 MAC地址作为应答。
根据权利要求 4所述的支持基站数据交换的光路终结点 OLT, 其特 征在于:
所述 IP转发单元, 釆用三层转发方式支持 BS之间的通信接口传输 的数据报文, 并且该数据报文釆用特定的虚拟局域网 VLAN标识; 所述 MAC转发单元, 釆用二层转发方式支持 BS和无线网关之间的 通信接口传输的数据报文;
或者,
所述 IP转发单元, 釆用 IP承载于千兆位无源光网络封装方式 IP over GEM方式支持 BS之间的通信接口传输的数据报文;
所述 MAC转发单元, 釆用以太网承载于千兆位无源光网络封装方 式 ETH over GEM方式支持 BS和无线网关之间的通信接口传输的数 据报文。
一种基站 BS, 其特征在于, 包括: 切换处理单元, 用于生成 BS间传输的数据报文, 将该数据报文传 输给 IP转发单元;
所述 IP转发单元, 用于根据所述切换处理单元传输过来的数据报 文的目的 IP地址, 査询预先建立的 IP转发表, 获取所述数据报文对 应的出 PON业务逻辑端口, 并通过该出 PON业务逻辑端口将所述 数据报文发送给 OLT。
[Claim S] 根据权利要求 7所述的基站 BS, 其特征在于, 所述 BS还包括: 信令处理单元, 用于通过 DHCP过程得到 DHCP服务器分配给 BS的 IP地址, 根据该 IP地址、 OLT分配的用于与所述 BS中的 BS间通信 接口交互数据报文的 PON业务逻辑端口, 建立 IP转发表, 所述 PO N业务逻辑端口包括入 PON业务逻辑端口和出 PON业务逻辑端口。
[Claim 9] 根据权利要求 7所述的基站 BS, 其特征在于, 所述 BS还包括: 无线处理单元, 用于实现 BS和无线网关之间的无线接口通信功能 , 生成 BS和无线网关间传输的数据报文, 将该数据报文传输给 M AC转发单元;
MAC转发单元, 用于通过自学习建立基于 BS的 IP地址、 OLT分配 的用于与所述 BS中的 BS和无线网关间通信接口交互数据报文的 PO
N业务逻辑端口的 MAC转发表, 所述 PON业务逻辑端口包括入 PO N业务逻辑端口和出 PON业务逻辑端口;
所述 MAC转发单元, 还用于根据所述无线处理单元传输过来的数 据报文的目的 IP地址, 査询所述 MAC转发表获取所述数据报文对 应的出 PON业务逻辑端口, 通过该出 PON业务逻辑端口将所述数 据报文发送给无线网关。
[Claim 10] 根据权利要求 7或 8或 9所述的基站 BS, 其特征在于, 所述 BS还包 括:
PON接口单元, 用于实现 OLT和 BS之间的 PON接口通信功能; PON配置单元, 用于配置 OLT给 BS分配的用于与所述 BS中的 BS间 通信接口交互数据报文、 与所述 BS中的 BS和无线网关间通信接口 交互数据报文的 PON业务逻辑端口, 所述 PON业务逻辑端口包括 入 PON业务逻辑端口和出 PON业务逻辑端口。
[Claim 11] 一种支持基站数据交换的系统, 其特征在于, 包括 OLT、 源 BS和 目的 BS, 其中,
所述源 BS, 用于生成所述源 BS和所述目的 BS间传输的数据报文, 根据该数据报文的目的 IP地址, 査询预先建立的 IP转发表, 获取所 述数据报文对应的出 PON业务逻辑端口, 并通过该出 PON业务逻 辑端口将所述数据报文发送给 OLT;
所述 OLT, 用于接收源 BS发送的数据报文, 根据该数据报文的目 的 IP地址、 入物理端口或入光网络单元 ONU端口、 和入 PON业务 逻辑端口, 査询预先建立的 IP转发表, 获取所述数据报文的出物 理端口或出 ONU端口、 出 PON业务逻辑端口, 利用所述出物理端 口或出 ONU端口、 出 PON业务逻辑端口将所述数据报文转发给所 述目的 BS。
[Claim 12] 一种基站数据交换的方法, 其特征在于, 预先建立 IP转发表, 所 述方法具体包括:
接收源 BS发送的数据报文;
根据所述数据报文的目的 IP地址、 入物理端口或入 ONU端口、 和 入 PON业务逻辑端口, 査询所述 IP转发表, 获取所述数据报文的 出物理端口、 出 PON业务逻辑端口, 利用所述出物理端口或出 ON U端口、 出 PON业务逻辑端口将所述数据报文转发给目的 BS。
[Claim 13] 根据权利要求 12所述的基站数据交换的方法, 其特征在于, 所述 预先建立 IP转发表, 具体包括:
侦听源 BS和 DHCP服务器之间的 DHCP报文, 得到所述源 BS的 IP地 址;
为所述源 BS分配与所述源 BS的 IP地址相对应的 PON业务逻辑端口 , 所述 PON业务逻辑端口包括入 PON业务逻辑端口和出 PON业务 逻辑端口, 用于与 BS中的 BS间通信接口交互数据报文; 根据所述 BS的 IP地址、 所述 PON业务逻辑端口建立所述 IP转发表 , 所述 IP转发表中包括: 入物理端口或入 ONU端口、 入 PON业务 逻辑端口、 目的地址或目的地址前缀、 出物理端口或出 ONU端口 、 和出 PON业务逻辑端口。
[Claim 14] 根据权利要求 12或 13所述的基站数据交换的方法, 其特征在于, 所述接收源 BS发送的数据报文, 具体包括:
接收源 BS发送的 ARP请求消息, 向所述源 BS发送携带 OLT的 MAC 地址的 ARP应答消息;
所述 OLT通过所述 PON业务逻辑端口, 接收所述源 BS根据所述 OL T的 MAC地址发送过来的数据报文, 所述数据报文的目的接收方 为目的 BS。
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