WO2013149587A1

WO2013149587A1 - Ethernet message compression and decompression methods and network element device

Info

Publication number: WO2013149587A1
Application number: PCT/CN2013/073712
Authority: WO
Inventors: 姚文达; 赵成顺; 彭良川
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-04-05
Filing date: 2013-04-03
Publication date: 2013-10-10
Also published as: CN103369593B; CN103369593A

Abstract

Provided are Ethernet message compression and decompression methods and a network element device. The Ethernet message compression method comprises: receiving an Ethernet message; and compressing a Layer 2 message header and/or a Layer 3 message header of the Ethernet message. The overhead of the Ethernet header is saved, the utilization rate of the air interface bandwidth is increased, and the limited air interface bandwidth resources are saved.

Description

Method for compressing and decompressing Ethernet message and network element device

Technical field

The present invention relates to the field of communications, and more particularly to a method and network element device for compressing and decompressing Ethernet packets in a microwave communication process.

Background technique

As one of the main means of modern communication transmission, microwave communication can provide powerful service transmission capability, and it is widely used due to its large transmission capacity, stable long-distance transmission quality, low investment, low cost, short construction period and convenient maintenance. The bearer network applied to 2G/3G mobile becomes an important choice for mobile operators to transmit voice and data services. Due to its point-to-point transmission characteristics, the microwave communication is also transmitted as a backbone network between the base station and the base station, between the base station and the base station control station, and the access gateway.

Ordinary microwave communication nodes are typically used in pairs, and each station typically includes a modem unit and a transmission unit. The modem unit (IDU) is placed indoors; the radio frequency transmitting unit (ODU) is placed on the tower together with the antenna. With the development of mobile communication, the services transmitted in the network are also increasingly diversified. Whether it is TDM (Time Division Multiplexing) service, E1 service or traditional Ethernet data service, it will be framed in the IDU and then sent out through the air interface. The air interface of the network element equipment is generally limited. With the development of technology, the demand for air interface bandwidth is increasing. How to save limited air interface bandwidth becomes more and more important. Summary of the invention

The embodiments of the present invention provide a method for compressing and decompressing Ethernet packets and a network element device to save the overhead of the Ethernet header.

The embodiment of the invention provides a method for compressing an Ethernet packet, including:

Receive Ethernet packets;

The above method may also have the following features: The layer 2 header of the Ethernet packet is compressed. Processing, including:

Comparing the data of the layer 2 header with the data in the first compressed table,

If the data is consistent, the data of the layer 2 header is replaced by the corresponding compressed identifier in the first compression table;

If the information is inconsistent, a compressed identifier is generated, and the Ethernet packet carrying the compressed identifier is transmitted, and the first compressed table is updated, and the next time the data of the layer 2 header is received, the same Ethernet packet is received. And replacing the data of the layer 2 packet header with the generated compressed identifier.

The above method may also have the following features: After the layer 2 packet header of the Ethernet packet is compressed, the method further includes:

And transmitting the processed Ethernet packet, where the Ethernet packet carries the verification information.

The foregoing method may also have the following features: The compressing the layer 3 header of the Ethernet packet, including:

And dividing the data of the layer 3 packet header of the Ethernet packet into a plurality of subsections, and comparing the data of each subsection with the data in the second compression table, if the data of each subsection is in the second compression table. If the data is consistent, the data of the layer 3 header is replaced by the corresponding compressed identifier;

If the data of the partial bar is inconsistent with the data in the second compressed table, the data of the layer 3 header is replaced by the corresponding compressed identifier, the data of the different section number and the bar indicating the part, and the data is updated. Said second compression table;

If the data of each section is inconsistent with the data in the second compression table, a compression identifier is assigned to each section, and the layer 3 is replaced by the compression identifier, the data indicating all the different section numbers and the bars. Data of the header, and updating the second compression table, when the data of the layer 3 header is received the same Ethernet "3⁄4 text", the data of the layer 3 header is replaced by the allocated compression identifier.

The above method may also have the following features: The compressing processing of the Layer 3 header of the Ethernet text includes:

The data of the layer 3 header of the Ethernet packet is divided into multiple groups, and each group is divided into multiple sections, and the data of each section in each group is compared with the data in the second compression table. , If the data of each section in the group is consistent with the data in the second compression table, the data of the group is replaced by the compression identifier corresponding to the group;

If the data of the existing partial section in the group is inconsistent with the data in the second compressed table, replace the data of the group with the compression identifier corresponding to the group, the different section number and the section indicating the data, and update The second compression table;

If the data of each section in the group is inconsistent with the data in the second compression table, the group is assigned a compression identifier, and the group is replaced by the compression identifier, the data indicating all the different section numbers and the bars. The data is updated, and the second compressed table is updated. When the same Ethernet packet of the corresponding group in the header of the layer 3 packet is received next time, the data of the group is replaced by the allocated compressed identifier.

The above method may also have the following features: updating the second compression table includes:

If the data of the partial bar is inconsistent with the data in the second compressed table, the corresponding data in the second compressed table is replaced with the data of the bar inconsistent data;

If the data of each section is inconsistent with the data in the second compression table, the corresponding relationship between the assigned compression identifier and the data of each section is directly added to the second compression table, or the first rule is replaced by a predetermined rule. The original data in the second compressed table.

The foregoing method may further have the following features: After performing the compression processing on the layer 3 packet header of the Ethernet packet, the method further includes:

The embodiment of the invention further provides a method for decompressing an Ethernet packet, including:

Receiving Ethernet ^艮文;

The foregoing method has the following features: Decompressing the Layer 2 packet header of the Ethernet packet, including:

If it is determined that the data of the layer 2 header includes only the compressed identifier, the corresponding data is retrieved from the first decompressed table according to the compressed identifier, and the data of the layer 2 header is restored.

If it is determined that the data of the layer 2 header includes only the compressed identifier and the check information, the corresponding data is extracted from the first decompressed table according to the compressed identifier, and the data of the layer 2 header is restored. Then, the restored data is verified according to the verification information, and if the verification result is incorrect, the feedback message carrying the compressed identifier is returned to the sending end of the Ethernet packet;

If it is determined that the data of the layer 2 packet header further includes a compressed identifier, the compressed identifier is extracted from the data of the layer 2 packet header, and the correspondence between the compressed identifier and the data of the layer 2 packet header is determined. Deposited in the first decompression table.

The foregoing method may also have the following features: Decompressing the Layer 3 packet header of the Ethernet packet, including:

If it is determined that the data of the layer 3 header includes only the compressed identifier, the corresponding data is retrieved from the second decompression table according to the compressed identifier, and the data of the layer 3 header is restored.

If it is determined that the data of the layer 3 header includes only the compressed identifier and the check information, the corresponding data is retrieved from the second decompressed table according to the compressed identifier, and the data of the layer 3 header is restored; And verifying the restored data according to the verification information, and if the verification result is incorrect, returning a feedback message carrying the compressed identifier to the sending end of the Ethernet packet;

If it is determined that the data of the layer 3 packet header includes the compressed identifier, the different section number and the section indicating the data, the corresponding data is extracted from the second decompression table according to the compressed identifier, and the extracted data is The data corresponding to the section number is replaced with the data of the section;

If it is determined that the data of the layer 3 header includes the compressed identifier, the data indicating all the different measure numbers and the measure, the compression identifier, the correspondence relationship indicating the data of all the different measure numbers and the measure are stored in the second Unzip the table.

If it is determined that the data of the layer 3 header includes multiple sets of data, the data of each group is decompressed, including:

If the data in the judgment group only includes the compression identifier, the corresponding data is retrieved from the second decompression table according to the compression identifier, and the data of the group is restored;

If the data in the judgment group includes only the compression identifier and the verification information, the corresponding data is retrieved from the second decompression table according to the compression identifier, and the data of the group is restored; and then the restored information is restored according to the verification information. The data is verified. If the verification result is incorrect, the sender of the Ethernet packet is sent. Returning a feedback message carrying the compressed identifier corresponding to the group; if the data in the determination group includes the compressed identifier, the different section number and the section indicating the data, the corresponding data is retrieved from the second decompression table according to the compressed identifier. , replacing the data corresponding to the section number in the extracted data with the data of the section;

If the data in the judgment group includes the compressed identifier, the data indicating all the different measure numbers and the measure, the compression identifier, the correspondence relationship indicating the data of all the different measure numbers and the measure are stored in the second decompression table. . The embodiment of the invention provides a network element device, including:

a receiving module, configured to receive an Ethernet message;

The first packet processing module is configured to perform compression processing on the layer 2 packet header and/or the layer 3 packet header of the Ethernet packet.

The above network element device may also have the following features:

The first packet processing module includes:

a first compression unit, configured to compare data of the layer 2 packet header with data in the first compression table, and if yes, replace the layer 2 with a corresponding compression identifier in the first compression table If the data is inconsistent, a compressed identifier is generated, the Ethernet packet carrying the compressed identifier is transmitted, and the first compressed table is updated, and the same Ethernet data is received when the layer 2 header is received. When the network packet is received, the data of the layer 2 packet header is replaced by the generated compressed identifier.

The above network element device may also have the following features:

The first packet processing module further includes:

And a sending unit, configured to transmit the Ethernet packet processed by the first compression unit, where the Ethernet packet carries verification information.

The above network element device may also have the following features:

The first packet processing module includes:

a second compression unit, configured to divide data of the layer 3 header of the Ethernet packet into a plurality of subsections, and compare data of each subsection with data in the second compression table, if data of each subsection If the data in the second compression table is consistent, the layer 3 message is replaced by the corresponding compressed identifier. Data of the header; if the data of the partial section is inconsistent with the data in the second compression table, the data of the layer 3 header is replaced by the corresponding compression identifier, the data indicating the different section number and the section. And triggering the update unit to update the second compression table; if the data of each section is inconsistent with the data in the second compression table, assign a compression identifier to each section, and use the compression identifier to indicate all the different The data of the section number and each section replaces the data of the layer 3 header, and triggers the update unit to update the second compression table. When receiving the same Ethernet packet with the data of the layer 3 header, The assigned compressed identifier replaces the data of the layer 3 header;

The updating unit is configured to replace, when the data of the partial measure is inconsistent with the data in the second compressed table, data corresponding to the data inconsistent in the second compressed table; And the data in the second compression table is inconsistent, and the corresponding relationship between the assigned compression identifier and the data of each section is directly added to the second compression table, or the second compression table is replaced by a predetermined rule. The original data.

The above network element device may also have the following features:

The first packet processing module includes:

a second compression unit, configured to divide the data of the layer 3 header of the Ethernet packet into a plurality of groups, each group being divided into a plurality of subsections, and data of each subsection in each group Comparing the data in the two compressed tables, if the data of each bar in the group is consistent with the data in the second compressed table, the data of the group is replaced by the corresponding compressed identifier of the group; If the data of the section is inconsistent with the data in the second compression table, the data of the group corresponding to the compression identifier, the inconsistent section number of the data, and the data inconsistent section are replaced by the data of the group, and the update unit is triggered. a second compression table; if the data of each section in the group is inconsistent with the data in the second compression table, assign a compression identifier to the group, and replace the data with the compression identifier, each section number, and each bar The data of the group, and triggering the update unit to update the second compression table, when the layer 3 is received, the data of the corresponding group in the header is the same Ethernet, and the compressed identifier is allocated In other words the set of data; and

An update unit, configured to replace data corresponding to the data in the second compression table with data of a bar inconsistent data if the data of the partial bar is inconsistent with the data in the second compression table; If the data in the second compression table is inconsistent, the corresponding relationship between the assigned compression identifier and the data of each bar is directly added to the second compression table, or is replaced by a predetermined rule. The original data in the second compressed table.

The above network element device may also have the following features:

The first packet processing module further includes:

And a sending unit, configured to transmit the Ethernet packet processed by the second compression unit, where the Ethernet packet carries verification information.

The above network element device may also have the following features:

The network element device further includes:

The second packet processing module is configured to decompress the layer 2 packet header and/or the layer 3 packet header of the received Ethernet packet.

The above network element device may also have the following features:

The second packet processing module includes:

a first decompression unit, configured to: if it is determined that the data of the layer 2 packet header includes only the compression identifier, extract the corresponding data from the first decompression table according to the compression identifier, and restore the layer 2 packet header If the data of the layer 2 header includes only the compressed identifier and the check information, the corresponding data is retrieved from the first decompressed table according to the compressed identifier, and the layer 2 header is restored. Data; and then verifying the restored data according to the verification information, and if the verification result is incorrect, returning a feedback message carrying the compressed identifier to the sending end of the Ethernet packet; The data of the layer 2 packet header further includes a compressed identifier, and the compressed identifier is extracted from the data of the layer 2 packet header, and the corresponding relationship between the compressed identifier and the data of the layer 2 packet header is stored in the Said in the first decompression table.

The above network element device may also have the following features:

The second packet processing module includes:

a second decompression unit, configured to: if it is determined that the data of the layer 3 packet header includes only the compression identifier, extract the corresponding data from the second decompression table according to the compression identifier, and restore the layer 3 packet header If the data of the layer 3 header includes only the compressed identifier and the check information, the corresponding data is retrieved from the second decompressed table according to the compressed identifier, and the layer 3 header is restored. Data; and then verifying the restored data according to the verification information, and if the verification result is incorrect, returning a feedback message carrying the compressed identifier to the sending end of the Ethernet packet; The data of the layer 3 header includes the compression identifier, the data indicating the different section numbers and the section data, and the corresponding data is extracted from the second decompression table according to the compression identifier, and the extracted data corresponds to the section number. The data is replaced with the data of the section; if it is determined that the data of the layer 3 header includes a compressed identifier, indicating all the different section numbers and the data of the section, the compressed identifier is indicated, indicating all the different section numbers and bars. The correspondence of the data is stored in the second decompression table.

The above network element device may also have the following features:

The second packet processing module includes:

a determining unit, configured to: if it is determined that the data of the layer 3 packet header includes multiple sets of data, triggering the second decompressing unit to decompress data of each group; and the decompressing unit is set to be in the determining group The data includes only the compressed identifier, and the corresponding data is retrieved from the second decompressed table according to the compressed identifier, and the data of the group is restored; if the data in the determining group includes only the compressed identifier and the verification information, according to the compression Identifying the corresponding data from the second decompression table, restoring the data of the group; and then verifying the restored data according to the verification information, and if the verification result is incorrect, reporting to the Ethernet The sending end of the text returns a feedback message carrying the compressed identifier corresponding to the group; if the data in the determining group includes the compressed identifier, the different section number and the section indicating the data, the compressed identifier is used from the second decompression table according to the compressed identifier. The corresponding data is taken out, and the data corresponding to the section number in the extracted data is replaced with the data of the section; if the data in the judgment group includes compression Knowledge, all indicating the number of different data sections and subsections, then the compression identifier indicating which data of all the different sections and subsections of the number stored in said second decompression table. In summary, the embodiments of the present invention provide a method for compressing and decompressing Ethernet packets and a network element device to save the overhead of the Ethernet header, improve the utilization of the air interface bandwidth, and save limited air bandwidth resources. BRIEF abstract

FIG. 1 is a flowchart of a method for compressing an Ethernet packet according to an embodiment of the present invention;

2 is a flowchart of a method for decompressing an Ethernet packet according to an embodiment of the present invention;

3 is a flowchart of a packet header of a compression layer 2 according to an embodiment of the present invention; 4 is a flowchart of a packet header of a decompression layer 2 according to an embodiment of the present invention;

FIG. 5 is a flowchart of a packet header of a compression layer 3 according to an embodiment of the present invention;

6 is a flowchart of a packet header of a decompression layer 3 according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a network element device according to an embodiment of the present invention. Preferred embodiment of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

As the trend of IP is deepened, more and more services will be encapsulated into Ethernet packets for transmission, but the overhead of Ethernet headers is at least 38 bytes. When we only care about services, this overhead ratio is larger. Therefore, the embodiment of the present invention proposes to compress the Ethernet packet header to improve the utilization of the air interface bandwidth and save limited air interface bandwidth resources. For the problem of compression of Ethernet data, there is no relevant solution in the current microwave communication.

FIG. 1 is a flowchart of a method for compressing an Ethernet "3⁄4" according to an embodiment of the present invention. As shown in FIG. 1, the method in this embodiment includes the following steps:

Sl l and the NE device receive Ethernet packets.

FIG. 2 is a flowchart of a method for decompressing an Ethernet text according to an embodiment of the present invention. As shown in FIG. 2, the method in this embodiment includes the following steps:

S21, the network element device receives the Ethernet ^艮文;

The compression of the header and/or layer 3 headers can identify the Vlan (virtual local area network) flag, implement packet compression and adaptive decompression processing, and have error correction capability to ensure normal operation of the system. The present invention reduces the amount of data in the transmission by compressing the Ethernet packet header in the service, thereby achieving the purpose of saving air interface bandwidth.

The compression of the layer 2 packet header, as shown in Figure 3, includes the following steps: Step 2001: Receive an IP packet (ie, an Ethernet packet), and compare the data of the layer 2 packet header with the data in the layer 2 compression table.

Preferably, after receiving an IP packet, the layer 2 header is compressed, and the MAC (Media Access Control) header data of the packet is compared with the layer 2 compression table, and the same is a hit. In step 2002, the difference is entered into the update state, and the process proceeds to step 2003.

Step 2002: Replace the data of the layer 2 packet header with the corresponding compression identifier in the layer 2 compression table. When the data in the incoming MAC packet header and the layer 2 compression table are consistent, layer 2 enters a compressed state. The MAC portion of the entire layer 2 is replaced in the link with a corresponding layer 2 compression flag in the layer 2 compression table.

Step 2003: Generate a compressed identifier, transmit the Ethernet packet carrying the compressed identifier, and update the layer 2 compressed table;

In this way, when the same Ethernet packet with the data of the layer 2 header is received next time, the data of the layer 2 header can be replaced by the generated compressed identifier.

When the data in the incoming MAC packet header and the layer 2 compression table are inconsistent, the layer 2 packet header enters an update state, and an update identifier is generated, which can be added to the MAC of the layer 2 data, and then transmitted to the peer end. , and update the compressed table.

The decompression process of the layer 2 packet header, as shown in Figure 4, includes the following steps:

Step 2010: The network element device on the decompressing end first detects whether the layer 2 compressed identifier exists in the identified Ethernet packet. If not, the Ethernet packet is an uncompressed packet, and the process proceeds to step 2020. If yes, the identification is compression. If the status message is a compressed status message, the process proceeds to step 2030. If the status message is updated, the process proceeds to step 2040.

In this embodiment, if the network element device determines that the data of the layer 2 header includes only the compressed identifier, or only the compressed identifier and the full information, the network element device identifies the compressed state.

Step 2020: Perform transparent transmission processing on uncompressed messages.

Step 2030: Firstly, for the packet in the compressed state, the compressed identifier is first identified, and according to the compressed identifier, the corresponding layer 2 MAC data is taken out in the decompressed table, and the original packet is restored. Step 2040: For the update message, the decompressing end first extracts the compressed identifier, and restores the original MAC data from the packet, and then proceeds to step 2050.

Step 2050: Enter the synchronization update state of the decompression table, and store the correspondence between the compressed identifier and the restored original layer 2 MAC data in the decompression table to ensure that the compression table and the decompression table are consistent.

For the layer 3 compression process, as shown in Figure 5, the following steps are included:

Step 3001: Packet: After receiving a new Ethernet packet, if it is identified that the Ethernet is a layer 3 packet, the data of the layer 3 packet header of the packet is grouped, and the subsequent compression process is performed. For the compression process for each group. Step 3002: Subsection: Subdivide each group of data into N bars, each of which is the smallest unit of the ^^ text compression;

For example, 16bit is a section.

Step 3003: Compression: Compare each group of message data with a local layer 3 compression table, and perform the following processing according to the comparison result:

If the data of each section in the group is consistent with the data in the layer 3 compression table, the data of the group is replaced by the corresponding compression identifier of the group;

If the data of the partial section in the group is inconsistent with the data in the layer 3 compression table, replace the data of the group with the corresponding compression identifier, the different section number and the section indicating the data, and update the layer 3 Compress the table, then go to step 3004;

If the data of each section in the group is inconsistent with the data in the layer 3 compression table, the group is assigned a compression identifier, and the data of the group is replaced by the data of the compression identifier, each section number, and each section, and the layer is updated. 3 Compressing the table, so that when the same Ethernet packet of the corresponding group in the header of the layer 3 packet is received next time, the data of the group can be replaced by the allocated compression identifier, and then the process proceeds to step 3004.

Step 3004: framing, framing each group of compressed messages, for example, compressing the identification first, and adding different bars in each group to the message and transmitting them.

The compression of layer 3 messages can also be done without grouping, and can be directly compressed by subsections, such as the following steps:

Step 3011: The data of the layer 3 header of the Ethernet packet is divided into multiple subsections; Step 3012: Comparing the data of each measure with the data in the layer 3 compression table, and performing the following processing according to the comparison result:

If the data of each section is consistent with the data in the layer 3 compression table, the data of the layer 3 header is replaced by the corresponding compression identifier; if the data of the partial section is inconsistent with the data of the layer 3 compression table, Replace the data of the layer 3 header with the corresponding compression identifier, the data indicating the different section number and the section, and update the layer 3 compression table; if the data of each section is inconsistent with the data in the layer 3 compression table And assigning a compression identifier to each section, replacing the data of the layer 3 packet header with the data of the compressed label, indicating all the different section numbers and each section, and updating the layer 3 compression table, so that the next time receiving When the data of the Layer 3 packet header is the same as the Ethernet packet, the data of the layer 3 header can be replaced by the allocated compression identifier.

As shown in FIG. 6, the decompression process of the layer 3 packet (not packet) includes the following steps: Step 3010: The decompressing end network element device parses the layer 3 packet into an ordinary packet, a compressed packet, or an update. For the packet, the normal packet is transparently processed. For the compressed packet, go to step 3020, and go to step 3030 for the update packet.

In this embodiment, if the network element device determines that the data of the layer 3 packet header includes only the compressed identifier, or only the compressed identifier and the check information, or the compressed identifier, the different section number and the bar of the indication part, Then, it is identified as a compressed message; if it is determined that the data of the layer 3 header includes a compressed identifier, indicating all the different measure numbers and the data of the measure, it is identified as an update message.

Step 3020: Decompress the compressed "^ text" as follows:

If the network element device determines that the data of the layer 3 packet header includes only the compressed identifier, the corresponding data is retrieved from the layer 3 decompression table according to the compressed identifier, and the data of the layer 3 packet header is restored; Determining that the data of the layer 3 packet header includes only the compression identifier and the verification information, and then extracting corresponding data from the layer 3 decompression table according to the compression identifier, and restoring the data of the layer 3 packet header; The verification information is used to check the restored data, and if the verification result is incorrect, the feedback message carrying the compressed identifier is returned to the sending end of the Ethernet packet;

If it is determined that the data of the layer 3 packet header includes the compressed identifier, the different section number and the section indicating the data, the corresponding data is extracted from the layer 3 decompression table according to the compressed identifier, and the extracted data is included in the data. The data corresponding to the section number is replaced with the data of the section. Step 3030: Store the compression identifier in the data of the layer 3 packet header, the correspondence relationship indicating the data of all the different section numbers and the section into the layer 3 decompression table, to update the restored packet to the local decompression. In the table, keep consistent with the compressed table.

If the grouping is performed as shown in Figure 3 above, the extraction and decompression are performed in groups. The decompression principle is similar to the decompression principle in Figure 6, as follows:

If the data in the judgment group only includes the compression identifier, the corresponding data is retrieved from the layer 3 decompression table according to the compression identifier, and the data of the group is restored;

If the data in the judgment group includes only the compression identifier and the verification information, the layer is determined according to the compression identifier.

3 Extracting the corresponding data in the decompression table, restoring the data of the group; then verifying the restored data according to the verification information, and if the verification result is incorrect, sending the Ethernet packet Returning a feedback message carrying the compressed identifier corresponding to the group; if the data in the group includes the compressed identifier, the different section number and the section indicating the data, the corresponding identifier is extracted from the layer 3 decompression table according to the compressed identifier. Data, the data corresponding to the section number in the extracted data is replaced with the data of the section;

If the data in the judgment group includes the compressed identifier, the data indicating all the different measure numbers and the measure, the compression identifier, the correspondence relationship indicating the data of all the different measure numbers and the measure are stored in the layer 3 decompression table. .

釆 Using the above compression method, the compression efficiency can be ensured, and the application of the normal text can be ensured. The actual network environment is complex and variable, and there is no single fixed message. The method expressed by the present invention can Adapt to the actual network environment, and ensure a good compression ratio when the resources are scarce. In particular, the packets processed by the compression can carry the verification information, or can be verified in each compression identifier. After the information is decompressed, the decompression end verifies the packet. If the verification result of the packet decompression is inconsistent with the checksum value, the feedback process is entered as follows:

Step 4001: The network element device on the decompressing end generates a feedback message according to the sequence of the feedback identifier + the compression identifier (or the compression number), and sends the feedback packet to the compression end along with the link.

Step 4002: The network element device at the compression end identifies the feedback identifier, and parses the compression number of the response. The contents of the local compressed table corresponding to the compressed identifier are cleared. In the compression system of the embodiment of the present invention, a feedback mechanism as described above may be introduced. This mechanism can ensure that when the decompression error is notified, the compression end is notified, and the compression table and the decompression table are consistently agreed to ensure a long time. The runtime compression function is correct.

In this embodiment, the network element device may be configured to compress only the layer 2 packet header, or may be configured to compress only the layer 3 packet header, or may be configured as the layer 2 packet header and the layer 3 packet. The headers are all compressed.

FIG. 7 is a schematic diagram of a network element device according to an embodiment of the present invention. As shown in FIG. 7, the network element device of this embodiment includes:

a receiving module 70, configured to receive an Ethernet packet;

The first packet processing module 71 is configured to perform compression processing on the layer 2 header and/or the layer header of the Ethernet packet.

The packet processing module 71 includes:

a first compression unit 710, configured to compare data of the layer 2 packet header with data in the first compression table, and if yes, replace the layer with a corresponding compression identifier in the first compression table If the data is inconsistent, a compressed identifier is generated, the Ethernet packet carrying the compressed identifier is transmitted, and the first compressed table is updated, and the data of the header of the layer 2 is received. When the Ethernet packet is received, the data of the layer 2 packet header is replaced by the generated compressed identifier.

The second module may further include:

The sending unit 711 is configured to transmit the Ethernet packet processed by the first unit, where the Ethernet packet carries the verification information.

In a preferred embodiment, the text processing module may further include:

The second compression unit 712 is configured to divide the data of the layer 3 header of the Ethernet packet into a plurality of subsections, and compare the data of each subsection with the data in the second compression table, if the data of each subsection is If the data in the second compressed table is consistent with the data in the second compressed table, the data of the layer 3 header is replaced by the corresponding compressed identifier; if the data of the partial segment is inconsistent with the data in the second compressed table, Corresponding compression identifier, indicating part of the different section number and the data of the section to replace the data of the layer 3 header, and triggering the update unit to update the second compression table; if the data of each section is related to If the data in the second compressed table is inconsistent, a compressed identifier is assigned to each of the sections, and the data of the layer 3 header is replaced by the data of the compressed identifier, indicating all the different section numbers and the sections, and the update is triggered. The unit 713 updates the second compression table, and when receiving the same Ethernet packet with the data of the layer 3 header, replaces the data of the layer 3 header with the allocated compression identifier.

The second compression unit 712 may be further configured to divide the data of the layer 3 header of the Ethernet packet into multiple groups, and each group is divided into multiple sections, and the data of each section in each group is Comparing with the data in the second compressed table, if the data of each bar in the group is consistent with the data in the second compressed table, the data of the group is replaced by the corresponding compressed identifier of the group; If the data of the partial section is inconsistent with the data in the second compression table, the data of the group is replaced by the corresponding compression identifier, the data of the inconsistent section number and the data of the data inconsistent section, and the update unit is triggered. Updating the second compression table; if the data of each bar in the group is inconsistent with the data in the second compression table, assigning a compression identifier to the group, the compression identifier, each bar number, and each bar The data replaces the data of the group, and triggers the update unit to update the second compression table. When receiving the same Ethernet packet with the same group of data in the layer 3 packet header, the compressed label is allocated by the corresponding group. Knowledge Replace the data for this group.

The updating unit 713 is configured to replace, when the data of the partial measure is inconsistent with the data in the second compressed table, the data in the second compressed table is replaced by the data of the data inconsistent section; If the data of the subsection is inconsistent with the data in the second compression table, the corresponding relationship between the assigned compression identifier and the data of each subsection is directly added to the second compression table, or the second compression is replaced by a predetermined rule. The original data in the table.

The first packet processing module may further include:

The sending unit 712 may be further configured to transmit the Ethernet packet processed by the third unit or the fourth unit, where the Ethernet packet carries verification information.

The network element device may further include:

a second packet processing module 72, configured to layer 2 headers of the received Ethernet packets

/ or layer 3 > 3⁄4 header for decompression processing.

The second packet processing module 72 may include:

a first decompression unit 720, configured to: if it is determined that the data of the layer 2 header includes only compression Identifying, according to the compression identifier, extracting corresponding data from the first decompression table, and restoring the layer

2 data of the packet header; if it is determined that the data of the layer 2 packet header includes only the compression identifier and the verification information, the corresponding data is retrieved from the first decompression table according to the compression identifier, and the layer 2 is restored. Data of the packet header; then, the restored data is verified according to the verification information, and if the verification result is incorrect, the feedback packet carrying the compressed identifier is returned to the sending end of the Ethernet packet. If it is determined that the data of the layer 2 packet header further includes a compression identifier, the compression identifier is extracted from the data of the layer 2 packet header, and the compression identifier is corresponding to the data of the layer 2 packet header. The relationship is stored in the first decompression table. The second decompression unit 721 is configured to: if it is determined that the data of the layer 3 packet header includes only the compression identifier, extract the corresponding data from the second decompression table according to the compression identifier, and restore the layer 3 report. Data of the header; if it is determined that the data of the layer 3 packet header includes only the compression identifier and the verification information, the corresponding data is retrieved from the second decompression table according to the compression identifier, and the layer 3 packet is restored. And the data of the header is verified by the verification information, and if the verification result is incorrect, the feedback message carrying the compressed identifier is returned to the sending end of the Ethernet packet; Determining that the data of the layer 3 packet header includes the compressed identifier, the data indicating the different section number and the section, and extracting the corresponding data from the second decompression table according to the compressed identifier, and extracting the data into the section The data corresponding to the number is replaced with the data of the section; if it is determined that the data of the layer 3 header includes a compressed identifier, indicating all the different section numbers and the data of the section, the compressed identifier is determined. The second solution indicating a corresponding relationship between all the data sections and subsections of the number stored in the compression table.

In a preferred embodiment, the second processing module 72 may further include:

The determining unit 722 is configured to: if it is determined that the data of the layer 3 header includes multiple sets of data, trigger the fourth unit to decompress data of each group;

The second decompressing unit 721 may also be configured to: if the data in the determining group includes only the compressed identifier, extract the corresponding data from the second decompressing table according to the compressed identifier, and restore the data of the group; The data includes only the compression identifier and the verification information, and the corresponding data is retrieved from the second decompression table according to the compression identifier, and the data of the group is restored; and then the restored data is verified according to the verification information. If the verification result is incorrect, return a feedback message carrying the compressed identifier corresponding to the group to the sending end of the Ethernet packet; if the data in the determining group includes a compressed identifier, a different section number and a section indicating the part Data from the second decompression table according to the compression identifier The corresponding data is taken out, and the data corresponding to the section number in the extracted data is replaced with the data of the section; if the data in the judgment group includes the compression identifier, the data indicating all the different section numbers and the section, the compression identifier is Corresponding relationships indicating data of all different measure numbers and measures are stored in the second decompression table.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

The above is only a preferred embodiment of the present invention, and of course, the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial Applicability The foregoing embodiments can save the overhead of the Ethernet header, improve the utilization of the air interface bandwidth, and save limited air interface bandwidth resources.

Claims

Claim

1. A method of compressing Ethernet >3⁄4 text, including:

Receive Ethernet packets;

2. The method of claim 1, wherein: the compressing the layer 2 header of the Ethernet packet comprises:

If not, generating a compressed identifier, transmitting the Ethernet text carrying the compressed identifier, and updating the first compressed table, and when receiving the same Ethernet packet with the data of the layer 2 header, The generated compressed identifier replaces the data of the layer 2 header.

The method of claim 2, wherein: after the layer 2 header of the Ethernet packet is compressed, the method further includes:

4. The method according to claim 1, wherein: the compressing the layer 3 header of the Ethernet packet comprises:

If the data of each section is inconsistent with the data in the second compression table, a compression identifier is assigned to each section, and the layer 3 is replaced by the compression identifier, the data indicating all the different section numbers and the bars. Data of the header, and updating the second compression table, when the layer 3 message is received next time When the header data is the same as the Ethernet "3", the data of the layer 3 header is replaced with the allocated compression identifier.

The method of claim 1, wherein: the compressing the layer 3 header of the Ethernet packet comprises:

The data of the layer 3 header of the Ethernet packet is divided into multiple groups, and each group is divided into multiple sections, and the data of each section in each group is compared with the data in the second compression table. ,

If the data of each section in the group is consistent with the data in the second compression table, the data of the group is replaced by the corresponding compression identifier of the group;

6. The method according to claim 4 or 5, wherein: updating the second compression table comprises: if the data of the partial measure is inconsistent with the data in the second compressed table, then the second compressed table The corresponding data in the data is replaced with the data of the data inconsistent section;

The method according to claim 4 or 5, wherein: after performing the compression processing on the layer 3 packet header of the Ethernet packet, the method further includes:

8. A method of decompressing an Ethernet text, comprising:

Receive Ethernet packets;

The method of claim 8, wherein: decompressing the layer 2 packet header of the Ethernet packet includes: if it is determined that the data of the layer 2 packet header includes only the compressed identifier, Extracting corresponding data from the first decompression table according to the compression identifier, and restoring data of the layer 2 packet header;

If it is determined that the data of the layer 2 header includes only the compressed identifier and the check information, the corresponding data is retrieved from the first decompressed table according to the compressed identifier, and the data of the layer 2 header is restored; And verifying the restored data according to the verification information, and if the verification result is incorrect, returning a feedback message carrying the compressed identifier to the sending end of the Ethernet packet;

The method of claim 8, wherein: the step of decompressing the layer 3 header of the Ethernet packet comprises: if it is determined that the data of the layer 3 header includes only the compressed identifier, Extracting corresponding data from the second decompression table according to the compressed identifier, and restoring data of the layer 3 header;

The method of claim 8, wherein: decompressing the layer 3 packet header of the Ethernet packet comprises: if it is determined that the data of the layer 3 packet header includes multiple sets of data, Solve the data of each group Compression, including:

If the data in the judgment group includes only the compression identifier and the verification information, the corresponding data is retrieved from the second decompression table according to the compression identifier, and the data of the group is restored; and then the restored information is restored according to the verification information. If the verification result is incorrect, the feedback message carrying the compressed identifier corresponding to the group is returned to the sending end of the Ethernet packet; if the data in the determining group includes the compressed identifier and the indication part is different The data of the section number and the section, the corresponding data is taken out from the second decompression table according to the compression identifier, and the data corresponding to the section number in the extracted data is replaced with the data of the section;

If the data in the judgment group includes the compressed identifier, the data indicating all the different measure numbers and the measure, the compression identifier, the correspondence relationship indicating the data of all the different measure numbers and the measure are stored in the second decompression table. .

12. A network element device, including:

a receiving module, configured to receive an Ethernet message;

The network element device of claim 12, wherein: the first packet processing module comprises: a first compression unit, configured to set data of the layer 2 header and the first compression table The data is compared, if the data is consistent, the data of the layer 2 header is replaced by the corresponding compression identifier in the first compression table; if not, a compressed identifier is generated, and the Ethernet carrying the compression identifier is transmitted. Transmitting, and updating the first compression table, when receiving the same Ethernet packet with the data of the layer 2 packet header, replacing the data of the layer 2 packet header with the generated compressed identifier.

The network element device of claim 13, wherein: the first packet processing module further comprises:

The network element device of claim 12, wherein: the first packet processing module comprises: a second compression unit, configured to divide data of the layer 3 header of the Ethernet packet into a plurality of subsections, and compare data of each subsection with data in the second compression table, if data of each subsection If the data in the second compressed table is consistent with the data in the second compressed table, the data of the layer 3 header is replaced by the corresponding compressed identifier; if the data of the partial segment is inconsistent with the data in the second compressed table, Corresponding compression identifier, data indicating a different section number and a section of the section to replace the data of the layer 3 header, and triggering the update unit to update the second compression table; if the data of each section and the second compression If the data in the table is inconsistent, a compressed identifier is assigned to each section, and the data of the layer 3 header is replaced by the data of the compressed identifier, indicating all the different section numbers and the sections, and the update unit is triggered. The second compression table, when receiving the same Ethernet packet with the data of the layer 3 header, replacing the data of the layer 3 header with the allocated compression identifier;

The network element device of claim 12, wherein: the first packet processing module comprises: a second compression unit, configured to divide data of a layer 3 header of the Ethernet packet into a plurality of groups, each group being divided into a plurality of sub-sections, comparing data of each sub-section in each group with data in the second compression table, if data of each sub-section in the group is in the second compression table If the data of the group is consistent, the data of the group is replaced by the corresponding compressed identifier of the group; if the data of the partial section in the group is inconsistent with the data of the second compressed table, the corresponding compressed identifier and data of the group are used. The inconsistent section number and the data of the inconsistent section replace the data of the group, and trigger the update unit to update the second compression table; if the data of each section in the group and the data in the second compression table are both Inconsistent, the group is assigned a compression identifier, the data of the group is replaced by the compression identifier, each measure number, and the data of each measure, and the update unit is triggered to update the second compression table, when the layer is received. 3 When the data of the corresponding group in the header is the same as the Ethernet data, the data of the group is replaced by the assigned compression identifier;

An update unit, configured to replace data corresponding to the second compressed table with data of a bar inconsistent data if the data of the partial measure is inconsistent with the data in the second compressed table; If the data of each section is inconsistent with the data in the second compression table, the corresponding relationship between the assigned compression identifier and the data of each section is directly added to the second compression table, or the first rule is replaced by a predetermined rule. The original data in the second compressed table.

The network element device of claim 15 or 16, wherein: the first packet processing module further comprises:

The network element device of claim 12, wherein: the network element device further comprises: a second packet processing module, configured to send a layer 2 header of the received Ethernet packet and/or The layer 3 header is decompressed.

The network element device of claim 18, wherein: the second packet processing module comprises: a first decompression unit, configured to: if it is determined that the data of the layer 2 packet header includes only the compressed identifier, Extracting the corresponding data from the first decompression table according to the compressed identifier, and restoring the data of the layer 2 packet header; if it is determined that the data of the layer 2 packet header includes only the compressed identifier and the verification information, The compression identifier extracts the corresponding data from the first decompression table, and restores the data of the layer 2 packet header; and then verifies the restored data according to the verification information, and if the verification result is incorrect, And returning, to the sending end of the Ethernet packet, a feedback message carrying the compressed identifier; if it is determined that the data of the layer 2 packet header further includes a compressed identifier, the data of the layer 2 packet header is And extracting the compression identifier, and storing the correspondence between the compression identifier and the data of the layer 2 packet header in the first decompression table.

The network element device of claim 18, wherein: the second packet processing module comprises: a second decompression unit configured to: if it is determined that the data of the layer 3 header includes only the compressed identifier, Extracting the corresponding data from the second decompression table according to the compressed identifier, and restoring the data of the layer 3 packet header; if it is determined that the data of the layer 3 packet header includes only the compressed identifier and the verification information, The compression identifier extracts the corresponding data from the second decompression table, and restores the data of the layer 3 header; and then verifies the restored data according to the verification information, and if the verification result is incorrect, And returning, to the sending end of the Ethernet packet, a feedback message carrying the compressed identifier; if it is determined that the data of the layer 3 header includes a compressed identifier, a different section number and a section data, And extracting corresponding data from the second decompression table according to the compression identifier, and replacing data corresponding to the section number in the extracted data with data of the section; if determining that the data of the layer 3 header includes the compression identifier And indicating the data of all the different measure numbers and measures, and storing the compression identifier, the correspondence indicating the data of all the different measure numbers and the measure into the second decompression table.

The network element device of claim 18, wherein: the second packet processing module comprises: a determining unit, configured to: if it is determined that the data of the layer 3 packet header includes multiple sets of data, triggering The second decompression unit decompresses the data of each group;

The second decompression unit is configured to: if the data in the judgment group includes only the compression identifier, extract the corresponding data from the second decompression table according to the compression identifier, and restore the data of the group; The data includes only the compression identifier and the verification information, and the corresponding data is retrieved from the second decompression table according to the compression identifier, and the data of the group is restored; and then the restored data is verified according to the verification information. If the verification result is incorrect, the feedback message carrying the compressed identifier corresponding to the group is returned to the sending end of the Ethernet packet; if the data in the determining group includes the compressed identifier, the different section number and the bar indicating the part Data, according to the compression identifier, the corresponding data is taken out from the second decompression table, and the data corresponding to the section number in the extracted data is replaced with the data of the section; if the data in the judgment group includes the compression identifier, the indication is all The data of different measure numbers and measures are stored in the compression mark, the correspondence indicating the data of all the different measure numbers and the measure. Said second decompression table.