CN101163095A - IP packet compression method for terminal-to-terminal link transmission - Google Patents
IP packet compression method for terminal-to-terminal link transmission Download PDFInfo
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- CN101163095A CN101163095A CNA2006101496813A CN200610149681A CN101163095A CN 101163095 A CN101163095 A CN 101163095A CN A2006101496813 A CNA2006101496813 A CN A2006101496813A CN 200610149681 A CN200610149681 A CN 200610149681A CN 101163095 A CN101163095 A CN 101163095A
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Abstract
The invention discloses an IP header compressing method, which is applied to an end-to-end link transmitting. The invention includes: the parameter of the IP header compressing is ensured by qualified network entities through negotiation. An IP header compressing module and an IP header compressing mapping number are stored. The internal transmitting entity of each basic service group compresses the IP header in a media visiting and control load. In the wireless transmitting, a fixed IP header message is replaced by the IP header compressing mapping number and a basic service group identification number. The IP header message is completely restored through the identifying the IP header compressing mapping number and the basic service group identification number by a receiving entity. With the method of the invention, the mess of a plurality of IP header compressing services coexisting is avoided; the digit occupied by the mapping number is effectively reduced; the message in the MAC layer of the prior art is effectively used; the utilization ratio of the wireless network in air transmitting is realized; the ratio of the valid data and the spending is increased; and the network transmitting efficiency is further enhanced.
Description
Technical field
The present invention relates to the wireless local area network (WLAN) system in the communications field, be specifically related in the WLAN (wireless local area network) method of IP header-compressed in the end-to-end link transmission.
Background technology
WLAN (WLAN (wireless local area network)) is meant that the employing wireless communication technology is interconnected with computer equipment, and formation can the mutual communication and the network system that realizes resource-sharing.In the wlan network environment, an extended service set is by one or more Basic Service Sets, and the compartment system formation that connects these Basic Service Sets, and each Basic Service Set comprises a wireless access point device.The expansion service group is distinguished by ESSID (extended service set identifier), WAP (wireless access point) is distinguished by BSSID (Basic Service Set identifier), terminal is passed through scanning channel, obtain extended service set and Basic Service Set information in the WLAN environment of living in, and select to add a suitable Basic Service Set.
802.11 the physical layer that standard is an IEEE802.11 WLAN standard working group to be formulated and media interviews control (MAC) consensus standard are convenient to WLAN (wireless local area network) and radio equipment manufacturer and are set up mutual operation network equipment.Physical layer has defined the signal characteristic and the modulation of transfer of data.Media interviews controls (MAC) layer can be considered by a series of finishing such as the service of information exchange, power control, associate management, management by synchronization and process management to be formed.
The IP header-compressed is a kind of reduction network management overhead commonly used in the point-to-point transmission, improves the method for the efficient of net load in transmission.In the transmission course of point-to-point, the packet header major part of transmission is the same, and is indeclinable, thus in transmission, only transmit the part of variation, at receiving terminal again according to the packet header reconstruct data bag of receiving in the past.
Be example with the voice application of using Real-time Transport Protocol, code check is the voice application of 32Kbps, and general every 20ms produces a secondary data, and each data volume that produces is 80 bytes.These 80 bytes are through RTP, UDP sends after three layers of processing of IP, and these three layers of meetings reach 40 bytes for 80 bytes increase network overheads, the data volume that then every 20ms need send becomes 120 bytes from 80 bytes, and valid data only occupy 66% of transmission total data.
But, in these 40 bytes of each transmission, have only the timestamp of frame, contents such as sequence number change, contents such as other guide such as source address, destination address, udp port number, successively two frames all are the same.If adopt the IP header compression technique, only transmit the part that changes in these data, just can become 2～4 bytes to the quantity of network overhead from 40 bytes, in 44 bytes of feasible each transmission, the ratio of net load brings up to 91%, thereby networks efficiency is got a promotion.This algorithm compresses the IP head, but can only be applied in the link of point-to-point, and can not be applied to end to end in the link.
WLAN (wireless local area network) works in two layers in the network model, and the transfer of data in the services set in WLAN (wireless local area network) all is to rely on the MAC Address of each network entity as address designation.Four MAC Address are arranged in the mac frame of WLAN (wireless local area network), have two Attribute domains (to DS, from DS) to be used for the whereabouts and the attribute of judgment data bag simultaneously.
The network configuration of WLAN (wireless local area network) and layout are fit to carry out the operation of IP header-compressed very much.But present protocol of wireless local area network does not have regulation how to concentrate in the basic service of WLAN (wireless local area network) to carry out the IP header-compressed and how to carry out IP header-compressed negotiations process between STA and the AP, and the negotiations process of IP header-compressed must be discerned the characteristic of upper-layer service.
Summary of the invention
Purpose of the present invention is exactly to overcome not have complete IP header-compressed processing method to be applied to shortcoming in the end-to-end link transmission in the prior art, proposes a kind of method of IP header-compressed.
A kind of method that is applied to the IP header-compressed of end-to-end link transmission comprises the steps:
The first step is determined the parameter of IP header-compressed through consultation between the qualified network entity, and preserves IP header-compressed template and IP header-compressed mapping numbering;
In second step, sending entity substitutes fixing IP header information with IP header-compressed mapping numbering and Basic Service Set identifier with the IP header-compressed in the media interviews control load in each Basic Service Set in wireless transmission;
In the 3rd step, receiving entity recovers complete IP header information by identification IP header-compressed mapping numbering and Basic Service Set identifier.
Described qualified network entity is meant the new business that meets the IP header-compressed of initiating, and the terminal or the WAP (wireless access point) of the support of the WAP (wireless access point) under it IP header compression function,
The described business that meets the IP header-compressed is meant that the fixed cycle sends fixing or fixed data length not, and the ratio of data length and IP header reaches the business of certain thresholding;
Qualified network entity must be within same subnet.
The described parameter of determining the IP header-compressed through consultation is meant the concrete compression parameters that will carry out the business of IP header-compressed between the qualified network entity by the WAP (wireless access point) negotiation.
The parameter of described IP header-compressed comprises the IP header-compressed template with service feature, the IP header-compressed mapping numbering in the Basic Service Set, Basic Service Set identifier;
Described IP header-compressed template with service feature comprises: complete IP header content comprises the IP except that professional data and the relevant portion of upper-layer protocol control head thereof;
IP header-compressed mapping in the described Basic Service Set is numbered, and is meant the call number of the replacement IP header-compressed template that WAP (wireless access point) is managed in Basic Service Set; This call number and IP header-compressed template are corresponding one by one in Basic Service Set.
Described preservation IP header-compressed template and IP header-compressed mapping numbering is meant that all nodes on the path that the data of business are transmitted write down all that this mapping is numbered and a copy of IP header-compressed template, with and mapping relations.
Described sending entity is with the IP header-compressed in the media interviews control load, in wireless transmission, substitute fixing IP header information with IP header-compressed mapping numbering and Basic Service Set identifier, be meant that business datum is entering MAC layer, send to before the physical layer, changing unit in the IP header before the business datum is kept, delete changeless part, and when structure wireless MAC control frame, add IP header-compressed mapping numbering.
Described sending entity can be the terminal that produces business datum, also can be the WAP (wireless access point) of transmitting data.
Described receiving entity recovers complete IP header information by identification IP header-compressed mapping numbering and Basic Service Set identifier, be meant that professional receiving entity is when receiving the wireless MAC control frame, by the sign and the IP header-compressed mapping numbering of carrying in the identification media interviews control frame, and the copy of the IP header-compressed template of receiving entity preservation, add changeless part in the IP header, the IP datagram head that regains one's integrity.
The method that the present invention proposes by transmission IP header-compressed template between the network entity, consults to determine IP header-compressed parameter, manages this basic service by each WAP (wireless access point) simultaneously and concentrates all IP header-compressed templates and the mapping relations between the call number.By when data send, only transmitting the part of the variation in the IP header, at the IP header that the recipient regains one's integrity by the IP header-compressed template of preserving, realize the length when reducing data transmits aloft, improve the efficient and the utilance of wireless network.
The method of the invention has following advantage:
1, through consultation process realize IP header-compressed template in business datum in the preservation of the copy on the transmission path and the mapping relations between the mapping numbering, and, avoid the confusion when a plurality of IP header-compressed are professional to coexist by all mapping numberings that the WAP (wireless access point) management basic service of managing BSS is concentrated.
2, by BSSID and IP header-compressed template of the common sign of mapping numbering, reduce the shared figure place of mapping numbering effectively, effectively utilized the MAC layer information that has existed.
3, part in wireless transmission by changing in the transmission IP header, and realize the utilance of wireless network in the aerial transmission at the IP header that the copy of recipient by the IP header-compressed template of preserving regains one's integrity, improve the ratio of valid data, and then improve network transmission efficiency expense.
Description of drawings
Fig. 1 is the structural representation that can carry out in the WLAN (wireless local area network) between the node of IP header-compressed;
Fig. 2 is the process chart of the method for the invention;
Fig. 3 is the handling process of an instantiation of the method for the invention.
Embodiment
Radio local network environment of the present invention can be a Basic Service Set, or an extended service set.As shown in Figure 1.Be without loss of generality, establish terminal 1 and be the source terminal of initiating the IP header-compressed, then the IP header-compressed can be divided in the wireless transmission means on the transmission path of terminal 1 network entity in all figure and opened and carry out.
Fig. 2 is the main flow chart of IP header compression method of the present invention, comprises the following steps:
1, determines the parameter of IP header-compressed between the qualified network entity through consultation, and preserve IP header-compressed template and IP header-compressed mapping numbering;
Above-mentioned qualified network entity be meant the new business that meets the IP header-compressed of initiating, and the WAP (wireless access point) under it is supported the terminal or the WAP (wireless access point) of IP header compression function;
The business that meets the IP header-compressed is meant that the fixed cycle sends fixing or fixed data length not, and the ratio of data length and IP header reaches the business of certain thresholding, and qualified network entity must be within same subnet.
Wherein IP header-compressed template comprises: complete IP header content, comprise other parts of the header of IP except that professional data or upper-layer protocol, and as the TCP parameter, UDP parameter, RTP parameter, RTCP parameter, source IP address, purpose IP address etc.; In the complete IP header in the content of the lifetime of business internal fixation: as source IP address, purpose IP address etc.; The part that in the lifetime of business, changes in the complete IP header: datagram numbering, time stamp etc.;
The parameter of IP header-compressed comprises the IP header-compressed template with service feature, the IP header-compressed mapping numbering in the BSS, BSSID.
Described preservation IP header-compressed template and IP header-compressed mapping numbering are meant that all nodes on the path that the data of business are transmitted write down all that this mapping is numbered and a copy of IP header-compressed template, with and mapping relations.
The above-mentioned parameter of definite IP header-compressed through consultation is meant the concrete compression parameters that will carry out the business of IP header-compressed between the qualified network entity by the WAP (wireless access point) negotiation.Distribute the IP header-compressed mapping in its BSS to number by WAP (wireless access point).This numbering is unique in Basic Service Set.
2, sending entity substitutes the information of standing part in the IP header with the IP header-compressed in the MAC load in each BSS with IP header-compressed mapping numbering and BSSID in wireless transmission;
Sending entity can be the terminal that produces business datum, also can be the WAP (wireless access point) of transmitting data.
Sending entity is with the IP header-compressed in the MAC load, business datum is entering the MAC layer, sends to before the physical layer, and the changing unit in the IP header before the business datum is kept, delete changeless part, and when structure wireless MAC frame, add IP header-compressed mapping numbering.
3, receiving entity recovers complete IP header information by identification IP header-compressed mapping numbering and BSSID;
Receiving entity can be a WAP (wireless access point), also can be the purpose terminal of business datum.
Receiving entity is when receiving the wireless MAC frame, by the sign and the IP header-compressed mapping numbering of carrying in the identification mac frame, and the copy of the IP header-compressed template of receiving entity preservation, add changeless part in the IP header, the IP datagram head that regains one's integrity.
In conjunction with Fig. 3, the implementation step of an instantiation of the method for the invention is as follows:
1, the new network entity that meets IP header-compressed business of beginning is discerned this professional parameter and characteristic parameter, determines whether to start the IP header-compressed, is, changes 2, otherwise transmits normally;
2, the network entity of the wireless portion on this professional transmission path is held consultation, to determine the parameter of IP header-compressed, concrete parameter comprises: the IP header-compressed template that this is professional, comprise complete IP header, changeless part in the IP header, the IP header-compressed mapping numbering that WAP (wireless access point) under the part that changes, terminal is distributed, BSSID.Be to change 3, otherwise transmit normally;
3, the network entity that participates in negotiation is preserved the copy of IP header-compressed template, IP header-compressed mapping numbering and BSSID;
If 4 sending entities receive the IP packet of having opened the IP header-compressed, then change 5, otherwise sending entity is given physical layer according to the normal handling procedure construction MAC Frame of standard code, passes through wireless network transmissions;
5, sending entity is removed the standing part that meets IP header-compressed template in the IP packet, keeps the part that changes, and changes 6;
6, sending entity carries out the mac frame structure to the data of compressed IP header, when structure, add IP header-compressed sign and IP header-compressed mapping numbering, then, give physical layer transmission with the mac frame after the processing of IP header-compressed according to the normal handling flow process;
7, receiving entity is discerned according to the IP header-compressed in the mac frame when receiving data, judges whether the data that receive are the data of having enabled the IP header-compressed, if, change 8, otherwise, according to the normal handling flow processing MAC Frame and the IP packet of standard code;
8, according to the corresponding IP header-compressed template of the numbering of the IP header-compressed in mac frame inquiry, setting according to template, add part fixing in the IP header, the IP datagram head that regains one's integrity is then according to the handling process forwarding of standard or to upper strata transmission of IP data bag.
Claims (8)
1. a method that is applied to the IP header-compressed of end-to-end link transmission is characterized in that, comprises the steps:
The first step is determined the parameter of IP header-compressed through consultation between the qualified network entity, and preserves IP header-compressed template and IP header-compressed mapping numbering;
In second step, sending entity substitutes fixing IP header information with IP header-compressed mapping numbering and Basic Service Set identifier with the IP header-compressed in the media interviews control load in each Basic Service Set in wireless transmission;
In the 3rd step, receiving entity recovers complete IP header information by identification IP header-compressed mapping numbering and Basic Service Set identifier.
2. the method that is applied to the IP header-compressed of end-to-end link transmission as claimed in claim 1 is characterized in that:
Described qualified network entity is meant the new business that meets the IP header-compressed of initiating, and the terminal or the WAP (wireless access point) of the support of the WAP (wireless access point) under it IP header compression function,
The described business that meets the IP header-compressed is meant that the fixed cycle sends fixing or fixed data length not, and the ratio of data length and IP header reaches the business of certain thresholding;
Qualified network entity must be within same subnet.
3. the method that is applied to the IP header-compressed of end-to-end link transmission as claimed in claim 1 is characterized in that:
The described parameter of determining the IP header-compressed through consultation is meant the concrete compression parameters that will carry out the business of IP header-compressed between the qualified network entity by the WAP (wireless access point) negotiation.
4. as claim 1 or the 3 described methods that are applied to the IP header-compressed of end-to-end link transmission, it is characterized in that:
The parameter of described IP header-compressed comprises the IP header-compressed template with service feature, the IP header-compressed mapping numbering in the Basic Service Set, Basic Service Set identifier;
Described IP header-compressed template with service feature comprises: complete IP header content comprises the IP except that professional data and the relevant portion of upper-layer protocol control head thereof;
IP header-compressed mapping in the described Basic Service Set is numbered, and is meant the call number of the replacement IP header-compressed template that WAP (wireless access point) is managed in Basic Service Set; This call number and IP header-compressed template are corresponding one by one in Basic Service Set.
5. the method that is applied to the IP header-compressed of end-to-end link transmission as claimed in claim 1 is characterized in that:
Described preservation IP header-compressed template and IP header-compressed mapping numbering is meant that all nodes on the path that the data of business are transmitted write down all that this mapping is numbered and a copy of IP header-compressed template, with and mapping relations.
6. the method that is applied to the IP header-compressed of end-to-end link transmission as claimed in claim 1 is characterized in that:
Described sending entity is with the IP header-compressed in the media interviews control load, in wireless transmission, substitute fixing IP header information with IP header-compressed mapping numbering and Basic Service Set identifier, be meant that business datum is entering MAC layer, send to before the physical layer, changing unit in the IP header before the business datum is kept, delete changeless part, and when structure wireless MAC control frame, add IP header-compressed mapping numbering.
7. the method that is applied to the IP header-compressed of end-to-end link transmission as claimed in claim 1 is characterized in that:
Described sending entity can be the terminal that produces business datum, also can be the WAP (wireless access point) of transmitting data.
8. the method that is applied to the IP header-compressed of end-to-end link transmission as claimed in claim 1 is characterized in that:
Described receiving entity recovers complete IP header information by identification IP header-compressed mapping numbering and Basic Service Set identifier, be meant that professional receiving entity is when receiving the wireless MAC control frame, by the sign and the IP header-compressed mapping numbering of carrying in the identification media interviews control frame, and the copy of the IP header-compressed template of receiving entity preservation, add changeless part in the IP header, the IP datagram head that regains one's integrity.
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| CN200610149681A CN100589441C (en) | 2006-10-13 | 2006-10-13 | IP packet compression method for terminal-to-terminal link transmission |
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| CN200610149681A CN100589441C (en) | 2006-10-13 | 2006-10-13 | IP packet compression method for terminal-to-terminal link transmission |
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| CN101163095A true CN101163095A (en) | 2008-04-16 |
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| CN102413506A (en) * | 2010-09-20 | 2012-04-11 | 华为技术有限公司 | Compression method and device |
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