WO2009152711A1

WO2009152711A1 - Method and device for realizing priority inter-communication

Info

Publication number: WO2009152711A1
Application number: PCT/CN2009/071751
Authority: WO
Inventors: 徐凯
Original assignee: 华为技术有限公司
Priority date: 2008-06-18
Filing date: 2009-05-12
Publication date: 2009-12-23
Also published as: CN101360124A; CN101360124B

Abstract

A method and a device for realizing priority inter-communication. A priority definition of a data message on the first network is mapped to the priority definition of the second network, when the data message is transmitted to the second network from the first network, or, the priority definition of the data message on the first protocol layer is mapped to the priority definition of the second protocol layer when the data message is transmitted from the first protocol layer to the second protocol layer in the same network. In this way, the priorities on the different networks or protocol layers are related with each other when the data message is transmitted in multi-network or multi-protocol layer. Furthermore, the method realizes inter-communication of the priority without spending extra cost of packaging, and the priority inter-communication ensures good Quality of Service (QoS) during transmission process, thus improves reliability of the system transmission.

Description

Method and device for realizing priority interworking

[1] This application claims priority to Chinese Patent Application No. 200810125756.3, entitled "Method and Apparatus for Realizing Priority Interoperability", filed on June 18, 2008, the entire contents of which are incorporated by reference. In this application.

[2] Technical field

[3] The present invention relates to the field of network communications, and in particular, to a method and apparatus for implementing priority interworking.

[4] Background of the invention

[5] At present, with the development of network communication technology, how to efficiently implement interworking between different networks has become the focus of many operators. In the Asynchronous Transfer Mode (ATM) network and Internet Protocol (IP, Internet)

Protocol) Network interworking, for example, ATM networks have high reliability and high quality of service (QoS, Qualit y of

The characteristics of Service) have become one of the main networking forms of current wireless networks. However, because of its low cost and high flexibility, IP networks have become another development direction of wireless network networking, so it is necessary to pass ATM networks. Interworking with IP networks to achieve the goal of developing IP network transmissions to reduce transmission costs and effectively utilizing existing ATM network resources.

[6] In the process of network interworking, ensuring the service quality and network reliability of different services in the network is an important indicator, that is, the QoS in the network interworking process needs to be ensured, and the QoS is prioritized by different services. Levels are reflected, so in the process of interoperating across networks or across protocol layers, ensuring the transfer of priorities will be a necessary condition for achieving such interworking. In the prior art, between different networks and networks, and between the protocol layer and the protocol layer, packet forwarding is usually used to implement packet forwarding and priority transmission across the network and protocol layers.

[7] For example, between IP network and ATM network, and IP network and Ethernet/Virtual LAN (Ethe met/Vlan), IP network and point-to-point protocol/multi-link bundled point-to-point protocol (PPP/MP, Point To Point Protocol/ Multil Link

The priority transfer between PPPs is taken as an example. As shown in Figure 1, the structure of priority transfer is shown in the figure. [8] 1) Interoperability between IP networks and ATM networks between different types of networks, the application is IP Over

The ATM (IPOA) approach solves the data path of the IP->ATM network, that is, after the IP packet enters the ATM network, the packet is encapsulated by IPoA, and then in the ATM adaptation layer (AAL5, AT M Adapter).

Layer) is transmitted; while ATM->IP network is prioritized, using edge-to-edge pseudowire emulation (PWE3, Pseudo Wire Emulation)

Edge-to-Edge) is a way to encapsulate and forward, similar to IPoA. Both of the above methods need to increase the package credit, which will reduce the transmission efficiency. Moreover, since the priority of the IP network is not reflected in the service priority of the ATM network after the encapsulation, the QoS in the interworking process is also Unable to get a valid guarantee.

[9] 2) Between different protocol layers, ie IP network layer and PPP/MP link layer or IP network layer and Ethernet

/ Vlan link layer interworking, due to IP over PPP/MP (iPoP) and IP over

The bearer mode of the Ethemet/Vlan (iPoE) is the general encapsulation mode of IP packets. The priority of the IP network is not reflected to the priority of other protocol layers. That is, the priority does not penetrate the PPP/MP link layer or Eth. In the transmission of the emet/Vlan link layer, the end-to-end (E2E, End to

End) QoS is not guaranteed.

[10] 3) Other interworking methods, such as PPP/MP and ATM networks, and between PPP/MP and Ethemet/Vl an, involve encapsulation and forwarding across protocol layers, and there is a problem of reduced transmission efficiency. It is generally not suitable as a priority interworking scheme for forwarding across protocol layers.

[11] It can be seen that the inventors have found that at least the following problems exist in the prior art: In the prior art, the definitions of priorities between the cross-network and the cross-protocol layers cannot be linked together, and the priority is required to be delivered through encapsulation. The transmission efficiency is low; and in the process of achieving interworking, QoS cannot be guaranteed, which affects the reliability of system transmission.

[12] Summary of the invention

[13] The technical problem to be solved by the embodiments of the present invention is to provide a method and apparatus for implementing priority interworking, which can associate priorities between different networks and protocol layers, and can be implemented without additional package credits. Priority interworking; and can guarantee better QoS, thereby improving the reliability of system transmission. [14] The embodiments of the present invention are implemented by the following technical solutions:

[15] A method of achieving priority interoperability, including:

[16] If the data message is transmitted from the first network to the second network, the priority definition of the data packet on the first network is mapped to the priority definition on the second network;

[17] or, if the data message is transmitted from the first protocol layer to the second protocol layer, mapping the priority definition of the data packet on the first protocol layer to the priority on the second protocol layer Level definition.

[18] An embodiment of the present invention further provides an apparatus for implementing priority interworking, including:

[19] mapping unit, configured to map priority definitions across networks; specifically, if data packets are transmitted from the first network to the second network, the data packets are prioritized on the first network. The level definition maps to the priority definition on the second type of network.

[20] An embodiment of the present invention further provides another apparatus for implementing priority interworking, including:

[21] a mapping unit, configured to map a priority definition of a cross-protocol layer; specifically, if the data packet is transmitted from the first protocol layer to the second protocol layer, the data packet is in the first protocol. The priority definition on the layer maps to the priority definition on the second protocol layer.

[22] It can be seen from the technical solution provided above that when a data message is transmitted from the first network to the second network, that is, the data message is transmitted between the first network and the second network, Mapping the priority definition of the data packet on the first type of network to the priority definition on the second type of network; or when the data message is transmitted from the first protocol layer in the same network to the second protocol Layer 吋, mapping the priority definition of the data packet on the first protocol layer to the priority definition on the second protocol layer, so that when the data packet is transmitted across the network and across the protocol layer, Priority can be set between different networks and protocol layers, and priority interworking can be realized without additional encapsulation overhead; peer-to-peer interworking can also ensure better QoS during transmission, thereby improving The reliability of the system transmission.

[23] BRIEF DESCRIPTION OF THE DRAWINGS

[24] FIG. 1 is a schematic structural diagram of priority transmission in the prior art;

2 is a schematic diagram showing priority definitions included in a frame structure in an IP network according to an embodiment of the present invention;

[26] FIG. 3 is a schematic structural diagram of implementing priority interworking between an ATM network and an IP network according to an embodiment of the present invention;

4 is a schematic structural diagram of a priority definition frame in an MP link layer according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of priority transfer between a network layer and an MP link layer according to an embodiment of the present invention; FIG. 6 is a schematic diagram of a priority definition of an Ethernet link layer protocol according to an embodiment of the present invention;

FIG. _{7 is a} schematic diagram of priority transfer between a network layer protocol and an Ethernet link layer protocol according to an embodiment of the present invention;

FIG. ₈ is a schematic structural diagram of priority interworking between a network and a protocol layer according to an embodiment of the present invention. Mode for carrying out the invention

Embodiments of the present invention provide a method and apparatus for implementing priority interworking. Mapping a priority definition of a data packet on one network to a priority definition on another network, or mapping a priority definition of a data message on one protocol layer to another protocol layer Priority definition, which enables data packets to be transmitted between networks and cross-protocol layers, can link priorities between different networks and protocol layers, and achieve priority interworking without additional encapsulation overhead;吋Priority interoperability also ensures better QoS during transmission, which improves the reliability of system transmission.

The method described in the embodiment of the present invention is now described in detail:

When a data message is transmitted from the first type of network to the second type of network, the priority definition of the data message on the first type of network is mapped to the priority definition on the second type of network.

Specifically, when the service data packet is transmitted between different types of networks, the priority definition of the data packet on the previous network is mapped to the priority definition on the latter network to be transmitted. The mapping of the priority definition may be performed by a device having a network switching function, that is, the function of the network switching function is used to map the priority of the data packet, thereby implementing data packet between different networks. Priority interoperability.

For example, when data packets are transmitted from the ATM network to the IP network, since the data packets are defined differently in the ATM network and the IP network, two different priority definitions need to be associated.

In the ATM network, the priority of the service data packet is defined by the service type. The priority is differentiated by configuring the service type of the virtual channel link. Table 1 below shows the ATM network. In the description of the priority defined by the business type:

[40] Table 1

[41] In the IP network, the priority definition is based on the DiffServ model. Figure 2 shows the priority definition of the frame structure in the IP network. The frame structure in the figure. The header contains a Differentiated Services Code Point (DSCP, Differentiated Services Code)

The domain of Point), the value of this DSCP field reflects the priority of data packets in the IP network.

[42] As shown in FIG. 3, a schematic diagram of a priority interworking between an ATM network and an IP network is shown. In FIG. 3: when a data packet is transmitted from an ATM network to an IP network, the service type in the ATM network can be prioritized. The level is mapped to the DSCP domain priority on the IP network by means of configuration switching. Similarly, when data packets are transmitted from the IP network to the ATM network, the priority definition of the data packets on the IP network can also be mapped to AT. The priority definition on the M network is that the DSCP domain priority on the IP network is mapped to the service type priority in the ATM network by means of configuration switching. Through the above operations, when data packets are transmitted across the network, the priorities between different networks can be linked through mapping, and no additional packaging overhead is required; and since the mapping rules are flexible, , so the data message is transmitted The lost Qos can also be well guaranteed.

[43] The configuration switching described above may be implemented by a network switching device, including but not limited to a base station, a base station controller, a core network, a router, and a switch.

[44] In addition, in this embodiment, when data packets are transmitted from the first protocol layer in the same network to the second protocol layer, the priority of the data packets on the first protocol layer may also be The definition maps to the priority definition on the second protocol layer.

[45] Specifically, when the service data packet is transmitted between different protocols in the same network, the priority definition of the data packet on the former protocol is mapped to the priority on the latter protocol. The mapping of the priority definition may also be performed by a device having a network switching function, that is, the network switching function device uses the function of the configuration switching to map the priority of the data packet, thereby implementing the data packet. Prioritization between different protocol layers.

[46] For example, when data packets are transmitted from the network layer protocol in the IP network to the MP link layer protocol, the priority definition of the data packets on the network layer protocol and the MP link layer protocol is different. So, you need to combine two different priority definition links.

[47] As mentioned earlier, the priority of data packets on the network layer protocol is reflected by the DSCP field value of the frame header; in the MP link layer protocol, it is the MP priority in the frame (MC). , MP

Class) The domain structure is shown in Figure 4. The frame structure of the priority definition in the MP link layer is shown in Figure 4. In Figure 4, the cls field and the class field of the MP header are MC domains that reflect the MP link layer priority definition. .

[48] Then, when the data packet is transmitted from the network layer protocol in the IP network to the MP link layer protocol, the priority of the data packet can be realized through the mapping from the DSCP domain to the MC domain from the network layer protocol to the MP chain. The transmission of the layer protocol, as shown in Figure 5, is the priority transfer between the network layer and the MP link layer. In the figure: When the data packet is transmitted from the MP link layer protocol to the network layer protocol, it can also pass the MC. The mapping from the domain to the DSCP domain enables the priority of data packets to be transferred from the MP link layer protocol to the network layer protocol. Through the above operations, when data packets are transmitted across the protocol layer, the priorities between different protocol layers can be linked through mapping, and no additional encapsulation overhead is required; Flexible configuration, so the Qos of data packet transmission can also be well guaranteed.

[49] The priority mapping between different protocol layers may also be a configuration switching function implemented by a network switching device, including but not limited to a base station, a base station controller, a core network, a router, and a handover. Change equipment and other equipment.

[50] It is worth noting that in addition to the ATM network and IP network mentioned above, the above different networks may also be networks such as a division multiplexing (TDM) network or a multi-protocol label switching (MPLS); Different protocol layers may be between the network layer protocol and the Ethernet link layer protocol in the IP network in addition to the network layer protocol and the MP link layer protocol in the IP network.

[51] For example, when data packets are transmitted from the network layer protocol in the IP network to the Ethernet link layer protocol, the priority of the data packets on the Ethernet link layer protocol is through the Vlan priority domain (Priority). The field reflects, as shown in Figure 6, the Ethernet link layer protocol priority definition diagram, the _USe r_prio rity field in Figure 6 is the priority definition on the Ethernet link layer protocol, where the Ethernet link Introducing the function of Vlan on the layer, then you can pass the DSCP domain to Vlan.

The mapping of Priority enables the priority of data packets to be transmitted from the network layer protocol to the Ethernet link layer protocol.

[52] Figure 7 shows the priority transfer between the network layer protocol and the Ethernet link layer protocol. In Figure 7, when the data packet is transmitted from the Ethernet link layer protocol to the network layer protocol, Via Vlan

Priority to DSCP domain mapping to achieve the priority of data packets from the Ethernet link layer protocol to the network layer protocol.

[53] In addition, in the embodiment of the present invention, when data packets need to be transmitted from the first network to different protocol layers in the second network, the data packets may first be prioritized on the first network. The level definition maps to the priority definition on the second network; then the priority definition of the data packet on the second network is mapped to the priority definition of the corresponding protocol layer in the second network.

[54] Specifically, when the service data packet spans both the network and the protocol layer, the priority of the data packet on the previous network may be mapped to be transmitted. A priority definition on the network; then sub-mapping between different protocols in the latter network, so that priority interworking between the network and the protocol layer can be achieved, where the priority definition mapping method is also This can be done by a device with network switching capabilities.

[55] Through the operation of the above specific embodiments, data messages can be transmitted between the network and the protocol layer, the priorities between different networks and protocol layers are linked, and no additional package credit is required. Priority interoperability can be achieved, which improves the transmission efficiency of the system. [56] For example, as shown in FIG. 8, the structure of the priority interworking between the network and the protocol layer is shown. In FIG. 8, when the data packet is transmitted from the ATM network to the MP link layer in the IP network, Mapping the priority of the data packet on the ATM network to the priority of the IP network. The priority of the service type in the ATM network is mapped to the DSCP domain priority on the IP network. The priority of the data packet on the IP network is mapped to the priority of the MP link layer in the IP network, that is, the priority of the data packet is achieved through the mapping from the DSCP domain to the MC domain. Delivery to the MP link layer protocol. In this way, the priority definition of the data packet on the ATM network can be directly reflected to the priority definition of the MP link layer, and the end-to-end priority interworking is realized, thereby improving the transmission performance of the system.

[57] Similarly, in the embodiment of the present invention, when the data message needs to be transmitted from the protocol layer of the first network to the second network, the data packet may first be in the protocol layer on the first network. The priority definition is mapped to the priority definition on the first type of network; then the priority definition of the data message on the first type of network is mapped to the priority definition on the second type of network.

[58] As shown in FIG. 8, when the data packet is transmitted from the MP link layer in the IP network to the ATM network, the priority definition of the data packet at the MP link layer is first mapped to the priority on the IP network. Level definition, that is, the mapping of the MC domain to the DSCP domain is used to realize the transfer of the priority of the data packet from the MP link layer protocol to the network layer protocol; then the priority definition of the data packet on the IP network is mapped to The priority of the ATM network is defined as the priority of the service type in the ATM network. Through such an inverse process, the priority definition of the data packet at the MP link layer can be directly reflected on the priority definition on the AT M network, and the end-to-end priority interworking can also be realized, thereby improving the transmission performance of the system.

[59] In addition, the transmission process of data packets from the ATM network to the Ethernet link layer is basically similar to the above. It is a mapping transition through the IP network, and the priority definition mapping of data packets on the ATM network is first mapped. Define the priority of the IP network; then map the definition of the network layer priority within the IP network to the priority definition of the Ethernet link layer, thereby passing the priority of the ATM service type to the Ethernet link layer. At the same time, the reverse mapping process can also pass the priority of the Ethernet link layer to the service type priority of the ATM.

[60] When the data message needs to be transmitted from the MP link layer to the Ethernet link layer, the network layer of the IP network can also be used as a mapping transition, and the data packet is first prioritized on the MP link layer. Level definition mapping to the network The priority of the network layer defines the DSCP domain; then the DSCP domain is mapped to the priority definition on the Ethernet link layer. This delivery mechanism can link the priorities of different link layers to further ensure different users. Interoperability with the end-to-end of the service.

[61] It will be understood by those skilled in the art that all or part of the steps of the foregoing embodiments may be implemented by a program to instruct related hardware, and the corresponding program may be stored in a computer readable storage medium. Execution, including the following steps:

[62] If the data message is transmitted from the first type of network to the second type of network, the priority definition of the data message on the first type of network is mapped to the priority definition on the second type of network;

[63] or, if the data message is transmitted from the first protocol layer to the second protocol layer, the priority definition of the data message on the first protocol layer is mapped to the priority on the second protocol layer. definition.

[64] The storage medium mentioned above may be a read only memory, a magnetic disk or an optical disk or the like.

An embodiment of the present invention further provides an apparatus for implementing priority interworking, where the apparatus includes a mapping unit, where the mapping unit is configured to map a priority definition across a network; specifically, the data packet is from the first The network is transmitted to the second network, and the priority definition of the data packet on the first network is mapped to the priority definition on the second network.

An embodiment of the present invention further provides an apparatus for implementing priority interworking, and a mapping unit, where the mapping unit is configured to map a priority definition across a protocol layer; specifically, the data packet is from the first type. The protocol layer transmits to the second protocol layer, and maps the priority definition of the data packet on the first protocol layer to the priority definition on the second protocol layer.

[67] The above-mentioned devices can be integrated in a base station, a base station controller, a core network device, a router or a switch device; or can be set as a separate functional entity.

[68] In summary, embodiments of the present invention enable data messages to be transmitted across networks and/or across protocol layers.

, prioritizes priorities between different networks and/or protocol layers, and achieves priority interworking without adding additional encapsulation overhead; peer-to-peer interworking also ensures better QoS during transmission. , thereby improving the reliability of system transmission.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art may within the technical scope disclosed by the embodiments of the present invention. Changes or substitutions that are easily conceived are intended to be covered by the scope of the present invention. Therefore, the protection of the present invention The scope of protection shall be subject to the scope of protection of the claims.

Claims

Claim

[1] A method for achieving priority interworking, characterized in that

If the data message is transmitted from the first type of network to the second type of network, the priority definition of the data message on the first type of network is mapped to the priority definition on the second type of network;

Or, if the data message is transmitted from the first protocol layer to the second protocol layer, the priority definition of the data packet on the first protocol layer is mapped to the priority definition on the second protocol layer.

[2] The method of claim 1, wherein the mapping the priority of the data packet on the first type of network to the priority of the second type of network further includes: The priority definition on the second network is mapped to the priority definition of the protocol layer in the second network.

[3] The method according to claim 1, wherein before the mapping of the priority of the data packet on the first type of network to the priority definition on the second network, the method further includes: Mapping the priority definition of the data packet in the protocol layer of the first type of network to the priority definition of the first type of network.

[4] The method according to claim 1, wherein the mapping the priority definition of the data packet on the first type network to the priority definition on the second type network comprises: The priority definition of the data packet on the first type of network is defined by configuring the exchange mapping to the priority on the second type of network.

[5] The method according to any one of claims 1 to 4, characterized in that

The network specifically includes: an asynchronous transfer mode ATM network, an internet protocol IP network, a split-multiplex TDM network, or a multi-protocol label switching MPLS network;

The protocol layer specifically includes: a network layer protocol in an IP network and a multi-link bundling point-to-point protocol MP link layer protocol; or a network layer protocol and an Ethernet link layer protocol in an IP network.

[6] The method according to claim 5, wherein the method further comprises:

If the data packet is transmitted from the ATM network to the IP network, the priority definition of the data packet on the ATM network is mapped to a priority definition on the IP network;

Or, if the data packet is transmitted from the IP network to the ATM network, the priority definition of the data packet on the IP network is mapped to a priority definition on the ATM network.

[7] The method according to claim 5, wherein the method specifically includes: if the data packet is transmitted from an ATM network to an MP link layer in an IP network, the data packet is at an ATM The priority definition on the network is mapped to the priority definition on the IP network; the priority definition of the data packet on the IP network is mapped to the priority definition of the MP link layer in the IP network;

Or, if the data packet is transmitted from the MP link layer in the IP network to the ATM network, mapping the priority of the data packet in the MP link layer in the IP network to a priority on the IP network Level definition; then map the priority definition of the data packet on the IP network to the priority definition on the ATM network.

[8] The method of claim 5, wherein

The priority of the data packet on the ATM network is specifically defined as: a service type of the data packet on the ATM network;

The priority definition of the data packet on the IP network is specifically: the data packet is a differentiated service code point DSCP domain on the IP network;

The priority definition of the data packet on the MP link layer protocol in the IP network is specifically: the MP priority field of the data packet in the MP link layer protocol;

The priority definition of the data packet on the Ethernet link layer protocol in the IP network is specifically: the virtual LAN priority field of the data packet in the Ethernet link layer protocol.

[9] A device for implementing priority interworking, comprising:

a mapping unit, configured to map a priority definition across the network; specifically, if the data packet is transmitted from the first network to the second network, mapping the priority of the data packet on the first network Defined for priority on the second network.

[10] A device for implementing priority interworking, comprising:

a mapping unit, configured to map a priority definition across the protocol layer; specifically, if the data packet is transmitted from the first protocol layer to the second protocol layer, the data packet is on the first protocol layer The priority definition maps to the priority definition on the second protocol layer.