CN101400085A - Method, device and system for negotiating maximum transmission unit value of path - Google Patents
Method, device and system for negotiating maximum transmission unit value of path Download PDFInfo
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- CN101400085A CN101400085A CNA2007101968895A CN200710196889A CN101400085A CN 101400085 A CN101400085 A CN 101400085A CN A2007101968895 A CNA2007101968895 A CN A2007101968895A CN 200710196889 A CN200710196889 A CN 200710196889A CN 101400085 A CN101400085 A CN 101400085A
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Abstract
An embodiment of the invention discloses a method of consulting path MTU, comprising: consulting according to the received path MTU, selecting the minimal path MTU as the practical path MTU after consulting, transmitting the practical path MTU into a movable terminal. The embodiment of the invention also discloses a device of consulting the path MTU and a system, the device comprising: a receiving module, a consulting module and a transmitting module; the system comprising: a movable terminal, a service node and a data gateway. According to the method, the method and the system, the service node and the data gateway obtain the practical path MTU through consulting and respectively inform the movable terminal and opposite terminal, which use correct path MTU to control the largest length of the transmitted original IP message, causing the original IP message after entering the communication network not to generate bursts, thereby increasing transmission ability of the network.
Description
Technical field
The present invention relates to mobile communication technology, refer in particular to a kind of method, Apparatus and system of negotiating maximum transmission unit value of path.
Background technology
Fig. 1 is the configuration diagram of mobile packet network in the prior art, as shown in Figure 1, portable terminal is linked into the service node (this service node also can be an IAD) of mobile core network by wireless access network, be connected to the data gateway of the message data net of required visit again by service node, finally be connected to the message data net of required connection by data gateway.Wherein, described wireless access network can be: the UMTS Terrestrial radio access network (E-UTRAN) of global system for mobile communications (GSM)/enhancing data transfer rate GSM evolution (EDGE) wireless access network (GERAN), universal mobile telecommunications system (UMTS) land radio access web (UTRAN), evolution, worldwide interoperability for microwave insert various Radio Access Networks such as (WiMax).
Mobility management protocol according to variant mobile network, need be between described service node (being IAD) and data gateway, for portable terminal is set up data channel, message between data network and the portable terminal, for example GPRS tunnel protocol (GTP) message, mobile IP message etc. are used to E-Packet.Because mobile communication generally all adopts the mode of tunnel protocol to set up above-mentioned data channel in the prior art.And described tunnel protocol need increase the tunnel protocol header in original IP message front, will make that therefore the length of the message that transmitted is elongated.
In the prior art, peer node in portable terminal and message data net carries out in the transfer of data, portable terminal or peer node generally can be controlled the burst size of the data message that is sent according to the maximum transmission unit value (MTU) of its own interfaces, for example, the representative value of described burst is 1500 bytes.But, between each network equipment in the mobile network, for example between service node and the data gateway, between wireless access network and the service node (being IAD), the general pattern that all adopts the tunnel to transmit.For example, GPRS (GPRS) and 3-G (Generation Three mobile communication system) architecture evolution (SAE) network using be the GTP tunnel agreement, and the SAE network can also adopt proxy-mobile IP (PMIP) tunnel protocol etc.
The initial IP message that is transmitted between portable terminal and the peer node can use the GTP tunnel agreement that it is encapsulated after entering mobile communication network.The schematic diagram of Fig. 2 in the prior art initial IP message being encapsulated.As shown in Figure 2, when using the GTP tunnel agreement that the initial IP message that enters mobile communication network is encapsulated, GTP protocol header of general increase is earlier increasing an IP head at skin then.The length of GTP protocol header is generally 8 bytes; the length of IP head is generally 20 bytes; therefore, when using the GTP tunnel agreement to encapsulate, the initial IP message that enters mobile communication network can increase by 28 bytes usually through the length after the GTP tunnel protocol encapsulation.In addition, data gateway also may use tunnel protocol between some message data net, for example general routed encapsulation (GRE) agreement, tunnel protocols such as IP safety (IPSec) agreement, multiprotocol label switching (mpls) agreement, therefore, the length through the IP message after the above-mentioned tunnel protocol encapsulation will further increase.
And in the prior art, portable terminal and peer node are not considered the influence of employed tunnel protocol in the mobile communication network when sending datagram, but only control the burst size of the data message that is sent according to the MTU of its own interfaces.And after the initial IP message enters mobile communication network, above-mentioned these tunnel protocols will make the message that sends to service node surpass the interface mtu between the network equipment because adding encapsulation tunnel protocol header, thereby cause when transmit IP message, producing a large amount of message fragments between the network equipment, reduced transmission performance end to end.
We can be with on the link paths between portable terminal and the peer node, makes the length that can not produce the maximum initial IP message of burst between each network node when transfer of data, is called the path mtu of this link paths.Because a portable terminal can connect a plurality of message data nets simultaneously, and the tunnel protocol that is adopted between each network node also may be different, and therefore same portable terminal may be different to the value of the path mtu of different message data nets.
In the prior art, service node and data gateway dispose path mtu separately respectively, and notify portable terminal or peer node respectively with the path mtu of configuration.But, when service node one side is provided with the value of path mtu, employed tunnel protocol on the link of mainly considering between wireless access network and wireless access network and the data gateway is encapsulated the increase of the IP message length that is caused; And when data gateway one side is provided with the value of path mtu, with the link of mainly considering between data gateway and the service node, and the increase of the IP message length that employed tunnel protocol encapsulation is caused on the link between data gateway and each message data net.If the path mtu that is disposed on service node and the data gateway is inequality, then the value of the path mtu that a certain side disposed will be greater than the value of the Actual path MTU on the link between portable terminal and the message data net, therefore, the initial IP message still may produce burst after entering mobile communication network.
For addressing the above problem, can guarantee that the path mtu that is disposed on service node and the data gateway equates by the mode of artificial negotiation.But, this scheme expends the great amount of manpower work with needs, and, because service node and being connected of data gateway are the relations of multi-to-multi, and service node and data gateway can be not in same network (for example, service node is in the roaming place, and data gateway is at ownership place), therefore the difficulty of manually consulting is very big.In addition, above-mentioned scheme does not consider that portable terminal arrives the situation that the path mtu of a plurality of different message data nets may be different, and, because a data gateway may connect up to a hundred message data nets, and a service node also may connect up to a hundred data gateways, in this case, it also is infeasible using artificial method of consulting configuration.
Summary of the invention
In view of this, the main purpose of the embodiment of the invention is to provide a kind of method, Apparatus and system of negotiating maximum transmission unit value of path, thus the Actual path MTU after making portable terminal obtain to consult.
For achieving the above object, the technical scheme in the embodiment of the invention is achieved in that
A kind of method of negotiating maximum transmission unit value of path, this method comprises:
Hold consultation according to received maximum transmission unit value of path MTU, choose minimal path MTU, described Actual path MTU is sent to portable terminal as the Actual path MTU after consulting.
A kind of device of negotiating maximum transmission unit value of path, this device comprises: receiver module, negotiation module and sending module;
Described receiver module is used for RX path MTU; And the path mtu that receives sent to negotiation module;
Described negotiation module is used for holding consultation according to received path mtu, chooses minimal path MTU as the Actual path MTU after consulting; MTU exports to sending module with Actual path;
Described sending module is used to send received Actual path MTU.
A kind of system of negotiating maximum transmission unit value of path, this system comprises: portable terminal, service node and data gateway;
Described portable terminal is used for being linked into mobile communication system by Access Network, is connected to data gateway and communicates by service node;
Described service node is used to portable terminal that access service is provided, and is established to the data channel of data gateway for portable terminal;
Described data gateway is used for setting up data channel with described service node, and portable terminal is connected to the message data network;
Described data gateway or service node are chosen minimum path mtu as Actual path MTU according to the received message of carrying path mtu, and the message of carrying described Actual path MTU is sent to portable terminal.
A kind of method, Apparatus and system of negotiating maximum transmission unit value of path are provided in the embodiments of the invention in summary.By the method and apparatus that embodiments of the invention provided, can make service node and data gateway can obtain Actual path MTU through consultation and also notify portable terminal and peer node respectively; The initial IP packet maximum length that portable terminal and peer node can use is consistent, path mtu control is accurately sent makes the initial IP message that enters behind the mobile communication network can not produce burst, thereby has improved the transmittability of network.
Description of drawings
Fig. 1 is the configuration diagram of mobile packet network in the prior art.
The schematic diagram of Fig. 2 in the prior art initial IP message being encapsulated.
Fig. 3 is a general flow chart of consulting the method for path mtu in the embodiment of the invention.
Fig. 4 a is first kind of flow chart of consulting the method for path mtu in the embodiments of the invention one.
Fig. 4 b is second kind of flow chart of consulting the method for path mtu in the embodiments of the invention one.
Fig. 4 c is the third flow chart of consulting the method for path mtu in the embodiments of the invention one.
Fig. 4 d is the 4th kind of flow chart of consulting the method for path mtu in the embodiments of the invention one.
Fig. 5 is a flow chart of consulting the method for path mtu in the embodiments of the invention two.
Fig. 6 is a flow chart of consulting the method for path mtu in the embodiments of the invention three.
Fig. 7 is a flow chart of consulting the method for path mtu in the embodiments of the invention four.
Fig. 8 is the schematic representation of apparatus of consulting path mtu in the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 3 is a general flow chart of consulting the method for path mtu in the embodiment of the invention.As shown in Figure 3, the method for negotiation path mtu comprises step as described below in the embodiment of the invention:
Step 301, portable terminal or service node and data gateway send to the negotiation network entity with the path mtu of self advising respectively.
Described negotiation network entity is exactly a network entity of consulting path mtu, and described negotiation network entity can be a data gateway; It can be service node; Can be third party's network entity, i.e. other network entities except that service node and data gateway; Also can be with data gateway and service node simultaneously as the negotiation network entity.
Step 302, negotiation network entity are held consultation according to received path mtu, choose minimal path MTU as the Actual path MTU after consulting.
Step 303, above-mentioned Actual path MTU is sent to portable terminal.
In the method for above-mentioned negotiation path mtu, service node and data gateway can obtain the path mtu of self advising in several ways.For example:
Service node can obtain from the parameter that portable terminal carries, and perhaps obtains from the subscription data of home subscriber server (HSS)/attaching position register (HLR), also can obtain by this locality configuration, and the above-mentioned method of perhaps comprehensive use is obtained;
Data gateway can obtain from the subscription data of authentication and authorization charging (AAA) server, and (PF) obtains from policy deciding functional entity, and perhaps local configuration is obtained, and the above-mentioned method of perhaps comprehensive use is obtained.
In addition, service node and data gateway are when consulting path mtu, and the framework according to service node and employed tunnel protocol of data gateway and system can use diverse ways, for example:
When service node and data gateway use the GTP agreement, can use the establishment carrying flow process of GTP agreement or more the new bearer flow process consult path mtu;
When service node and data gateway use MIP agreement, can use the Binding Update flow process of MIP agreement or agent binding update flow process to consult path mtu;
Also can come switching path MTU, for example when having disposed policy control architecture, can come switching path MTU by policy deciding functional entity (PF) by third party's network entity.
Below with reference to specific embodiment the method for above-mentioned negotiation path mtu is further introduced.
Embodiment one
Fig. 4 a is first kind of flow chart of consulting the method for path mtu in the embodiments of the invention one.As shown in Figure 4, first kind of method of consulting path mtu comprises step as described below in the embodiments of the invention one:
So far, portable terminal and data gateway have all obtained Actual path MTU, portable terminal is according to the size of Actual path MTU control uplink message, and data gateway is according to the size of Actual path MTU control downlink message, thereby makes the IP message that enters behind the mobile communication network can not produce burst.
In above-mentioned steps 403a, data gateway is the negotiation network entity of path mtu, promptly decides Actual path MTU by data gateway.But in the present embodiment, can also be with service node as consulting network entity, perhaps with service node and data gateway simultaneously as the negotiation network entity, shown in Fig. 4 b, 4c.
Fig. 4 b is second kind of flow chart of consulting the method for path mtu in the embodiments of the invention one.Shown in Fig. 4 b, in the method that second kind is consulted path mtu in embodiments of the invention one, step 401b, 402b, 404b are identical with step 401a, 402a, 404a in above-mentioned first kind of negotiation path mtu method.
In step 403b, when with service node when consulting network entity, first set up data and connected in the response message in that above-mentioned data gateway sends, that entrained will not be Actual path MTU, but the path mtu that data gateway is advised self; Service node receive above-mentioned first set up data and connect response message after, will be according to the path mtu of described data gateway suggestion, and the path mtu that service node is advised self holds consultation, with the path mtu of minimum as Actual path MTU.
Fig. 4 c is the third flow chart of consulting the method for path mtu in the embodiments of the invention one.Shown in Fig. 4 c, the third is consulted in the method for path mtu in embodiments of the invention one, and step 401c, 402c, 404c are identical with step 401a, 402a, 404a in above-mentioned first kind of negotiation path mtu method.
In step 403c, when with service node and data gateway during simultaneously as the negotiation network entity of path mtu, service node and data gateway send the path mtu of self advising to the other side respectively, hold consultation according to the path mtu that receives and the path mtu of self advising separately then, with the path mtu of minimum as Actual path MTU.Owing to all be to hold consultation, so the Actual path MTU that service node is consulted equates with the Actual path MTU that data gateway is consulted according to the path mtu that service node and data gateway are advised.
Especially, when with service node when consulting network entity, after service node obtains Actual path MTU through consultation, described Actual path MTU can be returned to data gateway, can described Actual path MTU not returned to data gateway yet.
Use the advantage of said method to be, service node can be known the path mtu of data gateway suggestion, if the path mtu of data gateway suggestion is during greater than the path mtu of service node suggestion, service node just can be under the situation that resource allows, suitably increase the path mtu that service node is advised, thereby make that the Actual path MTU of whole link is bigger.
In addition, in the present embodiment, according to different mobility management protocols and incident, setting up data connection request message between service node and the data gateway, can be the mobile IP registration binding message, internet key exchange (IKE) protocol of I Psec tunnel foundation/updating message etc. of the establishment/renewal bearer messages of GTP agreement, mobile IP (MIP) agreement;
In the present embodiment, for different wireless access networks, service node can be the different network equipment, for example, mobile management entity (MME)/gateway (Serving GW) of the service node (SGSN) of the IAD (ePDG) of the connecting system net gateway (ASN GW) of WiMax, SAE untrusted Access Network, UTRAN, E-UTRAN etc.;
In the present embodiment, according to different Access Network agreement and incidents, setting up data connection request message between portable terminal and the service node, can be address assignment message, the IKE protocol of I Psec tunnel foundation/updating message of mobile IP registration binding message, the dynamic host allocation protocol (DHCP) of GTP agreement establishment/renewal bearer messages, MIP agreement, location update message of mobile network etc.
In addition, in the present embodiment, if adopted mobile IP as mobility management protocol, then the service node shown in Fig. 4 can be an IAD, i.e. Mobile Access Gateway of portable terminal (MAG) or visit agency (FA); At this moment, when IAD receive portable terminal set up data connection request message after, IAD will send proxy-mobile IP bind-request message or mobile IP login request message to data gateway, request is established to the mobile IP data passage of data gateway, carries the path mtu of IAD suggestion in described proxy-mobile IP bind-request message or the mobile IP login request message; Data gateway is according to path mtu in described proxy-mobile IP bind-request message or the mobile IP login request message, and the MTU of present networks or data gateway itself (this value can be the local configuration of data gateway, also can be that data gateway obtains from the policing rule that policy determination functional entity issued), get minimum MTU as Actual path MTU; Then, data gateway transmission proxy-mobile IP binding response message or mobile IP login request message are to IAD, carry the path mtu of Actual path MTU or data gateway suggestion in this proxy-mobile IP binding response message or the mobile IP login request message, then, follow-up treatment step is consistent with step 404.
At this moment, according to different Access Network agreement and incidents, setting up data connection request message between portable terminal and the IAD (being service node), can be address assignment message, IKE protocol of I Psec tunnel foundation/updating message of establishment/renewal bearer messages, the DHCP of GTP agreement etc.;
For different wireless access networks, IAD (being service node) can be the different network equipment, for example, mobile management entity MME/gateway Serving GW of the service node (SGSN) of the IAD (ePDG) of the connecting system net gateway (ASN GW) of WiMax, SAE untrusted Access Network, UTRAN, 3GPP Long Term Evolution (LTE) etc.
Be depicted as the 4th kind of method flow diagram of consulting path mtu of the embodiment of the invention 1 as Fig. 4 d, be described in detail as follows:
Step 401d, portable terminal send first to service node and set up data connection request message, and request is established to the data channel of certain message data network.
Step 402d, service node receive first set up data connection request message after, send second and set up data connection request message to data gateway, request is established to the data channel of data gateway, and described second sets up in the data connection request message and carry the path mtu that local network is advised.The path mtu of described suggestion can be determined by considering service node ability, the ability (ability that comprises wireless access technology) of Access Network, the required parameters such as tunnel encapsulation expense of Access Network.
Step 403d, data gateway receive second set up data connection request message after, data channel between foundation and the service node, and set up the path mtu that provides in the data connection request message according to second, the path mtu of self being advised with data gateway is consulted, with the path mtu of minimum as Actual path MTU.Wherein, the required parameters such as tunnel encapsulation expense of the ability of the ability that the path mtu of data gateway suggestion can be by considering data gateway ability, this domain core net, the message data net of being visited and the data channel between the Access Network are determined.Then, data gateway returns first to service node and sets up data connection response message.
Step 404d, service node receive first set up data and connect response message after, send second to portable terminal and set up data connection response message, the notice portable terminal has been set up the data channel of message data network, also carries the path mtu that described local network is advised in this response message.Terminal is obtained the path mtu that local network is advised after receiving and setting up data answering message, and the MTU that self is advised with terminal consults, with the path mtu of minimum as Actual path MTU.The MTU that terminal is advised self can be pre-configured in terminal.
So far, portable terminal and data gateway have all obtained Actual path MTU, portable terminal is according to the size of Actual path MTU control uplink message, and data gateway is according to the size of Actual path MTU control downlink message, thereby makes the IP message that enters behind the mobile communication network can not produce burst.
Above-mentioned steps 403d, among the 404d, data gateway, terminal are the negotiation network entities of path mtu, promptly decide Actual path MTU by data gateway, terminal.
Use the advantage of said method to be, by rational network planning configuration, the network element entity of local network can not participate in the negotiation of path mtu, and only need the path mtu value of self network suggestion is sent to data gateway and terminal respectively, consult respectively by data gateway and terminal, obtain Actual path MTU.In actual mobile network's networking, three kinds of situations are generally arranged, when non-roaming, terminal, service node and data gateway belong to a Virtual network operator; During the roaming regression possession, terminal and data gateway belong to a Virtual network operator, and service node belongs to another access zone network operator; During the roaming routing optimality, service node and data gateway belong to access zone network operator, and terminal belongs to another Virtual network operator.Suppose that the network element in the same carrier network can set in advance the MTU value of present networks suggestion by configuration, terminal is or/and data gateway only need obtain the MTU value that the network on access ground is advised so, can consult with self pre-configured MTU value, obtain Actual path MTU.
Also disclose a kind of mobile terminal device in this real embodiment, mobile terminal device is linked in the communication network by wireless access network, sets up data by network elements such as data gateway or service node and network side and is connected.Described portable terminal comprises request unit, receiving element and selected cell.Request unit is used for sending connection request message to network side, and request is established to the data channel of certain message data network.Preferably, the described connection request message path mtu of portability portable terminal suggestion also.Receiving element is used to receive the response message that network side sends, and described response message has comprised the path mtu of network side suggestion; Perhaps when having carried the path mtu of portable terminal suggestion in the request message that portable terminal sends, comprised the minimal path MTU that network side is selected in the described response message.Selected cell is used for the path mtu according to the received network side suggestion of receiving element, and the path mtu of comparison terminal and network side suggestion, the path mtu of selecting smaller value to use as reality.Preferably, portable terminal also can comprise dispensing unit, is used to dispose and preserve the path mtu of terminal proposes.
Embodiment two
Connect in the data of the evolvement network (SAE network) of GPRS and to set up in the process, first data connection meeting and the attaching process of portable terminal are set up together.
Fig. 5 is a flow chart of consulting the method for path mtu in the embodiments of the invention two.As shown in Figure 5, the method for negotiation path mtu comprises step as described below in the embodiments of the invention two:
The Attach Request message of step 502, base station transmitting mobile terminal is given mobile management entity.
The response of step 509, mobile management entity is adhered to and is finished message and give the base station, carries above-mentioned Actual path MTU in this message, i.e. the second Actual path MTU that creates in the default bearing response message that receives of mobile management entity.
So far, portable terminal and data gateway have all obtained Actual path MTU, portable terminal is according to the size of Actual path MTU control uplink message, and data gateway is according to the size of Actual path MTU control downlink message, thereby makes the IP message that enters behind the mobile communication network can not produce burst.
In the SAE network, the service node function can be divided into mobile management entity and two network element devices of gateway realize that the function of above-mentioned negotiation network entity can be implemented on mobile management entity or the gateway or the both has.
In above-mentioned steps 506, data gateway is the negotiation network entity of path mtu, promptly decides Actual path MTU by data gateway.But in the present embodiment, can also be with service node as consulting network entity, perhaps with service node and data gateway simultaneously as the negotiation network entity.
When with service node as consulting network entity, perhaps with service node and data gateway during simultaneously as the negotiation network entity of path mtu, in the first establishment default bearing request message that above-mentioned data gateway sent, that entrained will not be Actual path MTU, but the path mtu that data gateway is advised self; After service node receives the above-mentioned first establishment default bearing request message, will be according to the path mtu of described data gateway suggestion, and the path mtu that service node is advised self is held consultation, as Actual path MTU, this Actual path MTU equates with the Actual path MTU that data gateway is determined with the path mtu of minimum.
In addition, when with service node when consulting network entity, after service node obtains Actual path MTU through consultation, described Actual path MTU can be returned to data gateway, can described Actual path MTU not returned to data gateway yet.
Embodiment three
If in the mobile network, disposed policy control functions, then can be by the policing rule (as quality of service QoS, charging etc.) of policy determination functional entity control data business.
Fig. 6 is a flow chart of consulting the method for path mtu in the embodiments of the invention three.As shown in Figure 6, the method for negotiation path mtu comprises step as described below in the embodiments of the invention three:
After step 603, data gateway receive mobile IP bind-request message, send the policy determination functional entity of the first policing rule request message to ground, local, the acquisition request policing rule carries the path mtu that data gateway is advised in the described first policing rule request message.
After step 604, policy determination functional entity receive the first policing rule request message of data gateway, data according to portable terminal connect situation, the generation strategy rule is handed down to data gateway by the first policing rule response message, and preserves the path mtu that data gateway is advised.
After step 607, policy determination functional entity receive the described second policing rule request message, according to the path mtu that data gateway and IAD provided, get minimum MTU, as the Actual path MTU after consulting, and this Actual path MTU is carried in the second policing rule response message, return to IAD.
After step 608, IAD receive the second policing rule response message, the corresponding strategy rule is installed, returns to portable terminal and set up data connection response message, described foundation in the data connection response message comprises Actual path MTU.
Whether step 609, policy determination functional entity change according to the policing rule after consulting, and judge whether to need to upgrade the policing rule of data gateway; Upgrade if desired, then policy determination functional entity sends to data gateway with the policing rule updating message, comprises the Actual path MTU after the negotiation in the described policing rule updating message.
After step 610, data gateway received the policing rule updating message, the update strategy rule was returned policing rule to policy determination functional entity and is upgraded response message.
In the present embodiment, because the resulting Actual path MTU of portable terminal will be as up path mtu, therefore how focusing in the technical scheme of present embodiment makes portable terminal obtain Actual path MTU, and and do not require that data gateway necessarily obtains Actual path MTU, promptly can not send Actual path MTU to data gateway, so above-mentioned step 609 and step 610 are optional steps.And, owing to be independent of each other between step 609,610 these two steps and the step 607,608, there is not the problem of execution sequence, therefore, step 609 and step 610 can be carried out any time after step 606.
In addition, in above-mentioned method, the negotiation network entity is a policy determination functional entity.In the present embodiment, can also be with service node or data gateway as consulting network entity.
When data gateway when consulting network entity, service node sends to policy determination functional entity with the path mtu of suggestion, data gateway obtains the path mtu that service node is advised from policy determination functional entity, data gateway is held consultation according to service node path mtu of advising and the path mtu of self advising, chooses minimal path MTU as the Actual path MTU after consulting; Actual path MTU after consulting is sent to policy determination functional entity, and the Actual path MTU after will being consulted by policy determination functional entity sends to service node;
When service node when consulting network entity, data gateway sends to policy determination functional entity with the path mtu of suggestion, service node obtains the path mtu that data gateway is advised from policy determination functional entity, service node is held consultation according to data gateway path mtu of advising and the path mtu of self advising, chooses minimal path MTU as the Actual path MTU after consulting.At this moment, service node can send to policy determination functional entity with the Actual path MTU after consulting, and the Actual path MTU after will being consulted by policy determination functional entity sends to data gateway; Certainly, service node can not send to policy determination functional entity with the Actual path MTU after consulting yet.
Embodiment four
In the present embodiment, portable terminal can be directly mutual with data gateway by mobile IP signaling, and set up the data connection.
Fig. 7 is a flow chart of consulting the method for path mtu in the embodiments of the invention four.As shown in Figure 7, the method for negotiation path mtu comprises step as described below in the embodiments of the invention four:
Set up the local data interface channel between step 701, portable terminal and the service node (being IAD), portable terminal obtains the path mtu of Access Network in this process.This path mtu can be considered the tunnel encapsulation expense of Access Network ability, access network data channel etc.
Step 702, portable terminal send mobile IP Binding Update request message to data gateway, and the mobile IP that request is established to data gateway connects, and carries the above-mentioned path mtu that obtains in this request message.
Step 703, data gateway are according to the mobile IP Binding Update request message that receives, setting up mobile IP with portable terminal is connected, and according to the path mtu in the mobile IP Binding Update request message, hold consultation with the path mtu that data gateway is advised self, get minimum MTU as Actual path MTU.The path mtu of above-mentioned data gateway suggestion can be considered the ability of core net, the tunnel encapsulation expense of core network data passage, the message data net ability of being visited etc.Actual path MTU after data gateway will be consulted is as downlink path MTU, with control downlink data newspaper size.
Step 704, data gateway send mobile IP Binding Update response message to portable terminal, carry the Actual path MTU after the above-mentioned negotiation in the described mobile IP Binding Update response message.
Fig. 8 is the schematic representation of apparatus of consulting path mtu in the embodiment of the invention.As shown in Figure 8, the device 800 of the negotiation path mtu in the embodiment of the invention comprises: receiver module 801, negotiation module 802 and sending module 803;
Described receiver module 801 is used for RX path MTU; And the path mtu that receives sent to negotiation module 802;
Described negotiation module 802 is used for holding consultation according to received path mtu, chooses minimum path mtu as the Actual path MTU after consulting; Actual path MTU is exported to sending module 803;
Described sending module 803 is used to send received Actual path MTU.
In addition, the device of above-mentioned negotiation path mtu can be network entity independently, for example, can be policy determination functional entity etc.; The device of described negotiation path mtu can also not be a network entity independently, but is integrated in service node or the data gateway, perhaps is integrated in simultaneously in service node or the data gateway.
A kind of system of negotiating maximum transmission unit value of path also is provided in the embodiments of the invention, and this system comprises: portable terminal, service node and data gateway;
Described portable terminal is used for being linked into mobile communication system by Access Network, is connected to data gateway and communicates by service node;
Described service node is used to portable terminal that access service is provided, and is established to the data channel of data gateway for portable terminal;
Described data gateway is used for setting up data channel with described service node, and portable terminal is connected to the message data network;
Described data gateway or service node are chosen minimum path mtu as Actual path MTU according to the received message of carrying path mtu, and the message of carrying described Actual path MTU is sent to portable terminal.
In the system of above-mentioned negotiating maximum transmission unit value of path, can be with service node or data gateway respectively as consulting network entity, also can be with service node and data gateway simultaneously as the negotiation network entity.
1) when data gateway when consulting network entity:
Service node sends the message of carrying path mtu to data gateway; Data gateway is chosen Actual path MTU according to path mtu of self advising and the message of carrying path mtu that receives; Then, the message that data gateway will carry described Actual path MTU sends to service node, and service node sends to portable terminal with described message of carrying Actual path MTU.
Another situation is:
When data gateway when consulting network entity, portable terminal sends the message of carrying path mtu to data gateway; Data gateway is chosen Actual path MTU according to path mtu of self advising and the message of carrying path mtu that receives; Then, the data gateway message that will carry described Actual path MTU sends to portable terminal.
2) when service node when consulting network entity:
Data gateway sends the message of carrying path mtu to service node; Service node is chosen Actual path MTU according to path mtu of self advising and the message of carrying path mtu that receives; Then, the service node message that will carry described Actual path MTU sends to portable terminal.
3) when service node and data gateway conduct negotiation simultaneously network entity:
Service node and data gateway send the message of carrying path mtu to the other side respectively, and according to received message of carrying path mtu and the MTU that self advises, choose Actual path MTU respectively; Then, the service node message that will carry described Actual path MTU sends to portable terminal.
In addition, can also comprise a mobile management entity in the system of above-mentioned negotiating maximum transmission unit value of path.At this moment:
Described portable terminal sends the message of carrying path mtu to mobile management entity; Described mobile management entity is according to the message of carrying path mtu that receives, portable terminal is carried out access authentication after, send the message of carrying path mtu to service node; And the message of carrying Actual path MTU that service node returns sent to portable terminal.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (28)
1, a kind of method of negotiating maximum transmission unit value of path is characterized in that, this method comprises:
Hold consultation according to received maximum transmission unit value of path MTU, choose minimum path mtu, described Actual path MTU is sent to portable terminal as the Actual path MTU after consulting.
2, method according to claim 1 is characterized in that, described holding consultation according to received path mtu comprises:
Data gateway receives the path mtu that service node is advised from setting up of service node transmission the data connection request;
Perhaps, data gateway receives the path mtu that service node is advised from the network entity except that service node and data gateway;
The path mtu that path mtu that the service node that the data gateway basis receives is advised and data gateway are advised self is held consultation;
Describedly described Actual path MTU sent to portable terminal comprise:
Data gateway sends to service node with described Actual path MTU, makes service node that described Actual path MTU is sent to portable terminal.
3, method according to claim 1 is characterized in that, described holding consultation according to received path mtu comprises:
Data gateway receives the path mtu that portable terminal is advised from the mobile IP Binding Update request that portable terminal sends;
The path mtu that path mtu that the portable terminal that the data gateway basis receives is advised and data gateway are advised self is held consultation;
Describedly described Actual path MTU sent to portable terminal comprise:
Data gateway sends to portable terminal with described Actual path MTU.
4, method according to claim 1 is characterized in that, described holding consultation according to received path mtu comprises:
Service node connects and to receive the path mtu that data gateway is advised replying from the data of setting up that data gateway returns;
Perhaps, service node receives the path mtu that data gateway is advised from the network entity except that service node and data gateway;
The path mtu that path mtu that the data gateway that the service node basis receives is advised and service node are advised self is held consultation;
Describedly described Actual path MTU sent to portable terminal comprise:
Service node sends to portable terminal with described Actual path MTU.
5, method according to claim 4 is characterized in that, this method also further comprises:
Service node sends to data gateway with described Actual path MTU.
6, method according to claim 1 is characterized in that, described holding consultation according to received path mtu comprises:
Data gateway receives the path mtu that service node is advised from setting up of service node transmission the data connection request;
Service node connects and to receive the path mtu that data gateway is advised replying from the data of setting up that data gateway returns;
The path mtu that path mtu that service node and data gateway are advised according to data gateway respectively and service node are advised is held consultation;
Describedly described Actual path MTU sent to portable terminal comprise:
The just described Actual path MTU of service node sends to portable terminal.
7, method according to claim 1 is characterized in that, described holding consultation according to received path mtu comprises:
Network entity except that service node and data gateway receives the path mtu that service node and data gateway are advised from the policing rule request that service node and data gateway send;
The path mtu that network entity except that service node and data gateway is advised according to service node and data gateway is held consultation;
Describedly described Actual path MTU sent to portable terminal comprise:
Network entity except that service node and data gateway sends to service node with described Actual path MTU, makes service node that described Actual path MTU is sent to portable terminal.
8, method according to claim 7 is characterized in that, this method also further comprises:
Network entity except that service node and data gateway sends to data gateway with described Actual path MTU.
9, according to the method described in the claim 2,6,7 or 8, it is characterized in that this method also comprises:
The parameter of carrying from portable terminal, obtain the path mtu that service node is advised from the subscription data of home subscriber server/home location register or by this locality configuration.
10, method according to claim 9 is characterized in that, this method also comprises:
Determine the path mtu that described service node is advised according to tunnel encapsulation expense or user contracting data that ability, the ability of wireless access technology, the Access Network of service node ability, Access Network are required.
11, according to each described method in the claim 4 to 8, it is characterized in that this method also comprises:
From the subscription data of authentication and authorization charging server, obtain the path mtu that data gateway is advised from policy deciding functional entity or by this locality configuration.
12, method according to claim 11 is characterized in that, this method also comprises:
Ability or the required tunnel encapsulation expense of the data channel between data gateway and the Access Network according to the ability of data gateway ability, core net, the message data net of being visited are determined the path mtu that described data gateway is advised.
13, according to claim 2 or 6 described methods, it is characterized in that this method also comprises:
Describedly set up establishment default bearing request message or proxy-mobile IP bind-request message or the mobile IP login request message that the data connection request is the GPRS tunnel protocol.
14, according to claim 4 or 6 described methods, it is characterized in that this method also comprises:
The described data of setting up connect establishment default bearing response message or the proxy-mobile IP binding response message or the mobile IP login request message of replying to the GPRS tunnel protocol.
15, a kind of device of negotiating maximum transmission unit value of path is characterized in that, this device comprises: receiver module, negotiation module;
Described receiver module is used for RX path MTU; And the path mtu that receives sent to negotiation module;
Described negotiation module is used for holding consultation according to received path mtu, chooses minimal path MTU as the Actual path MTU after consulting.
16, device according to claim 15 is characterized in that, described device also comprises sending module, is used for the Actual path MTU that negotiation module is selected is sent to portable terminal.
17, according to claim 15 or 16 described devices, it is characterized in that:
The device of described negotiating maximum transmission unit value of path is an independent community, or is integrated in the network equipment.
18, device according to claim 15 is characterized in that, bag is stated device and is integrated in the portable terminal, also comprises dispensing unit, and described dispensing unit is used to preserve the path mtu of portable terminal suggestion.
19, a kind of system of negotiating maximum transmission unit value of path, this system comprises: portable terminal, service node and data gateway;
Described portable terminal is used for being linked into mobile communication system by Access Network, is connected to data gateway and communicates by service node;
Described service node is used to portable terminal that access service is provided, and is established to the data channel of data gateway for portable terminal;
Described data gateway is used for setting up data channel with described service node, and portable terminal is connected to the message data network;
It is characterized in that: described data gateway or service node are chosen minimum path mtu as Actual path MTU according to the received message of carrying path mtu, and the message of carrying described Actual path MTU is sent to portable terminal.
20, system according to claim 19 is characterized in that, described data gateway or service node are chosen Actual path MTU and comprised according to the received message of carrying path mtu:
Service node sends the message of carrying path mtu to data gateway;
Data gateway is chosen Actual path MTU according to path mtu of self advising and the message of carrying path mtu that receives;
The described message that will carry described Actual path MTU sends to portable terminal and comprises:
The message that data gateway will carry described Actual path MTU sends to service node, and service node sends to portable terminal with described message of carrying Actual path MTU.
21, system according to claim 19 is characterized in that, described data gateway or service node are chosen Actual path MTU and comprised according to the received message of carrying path mtu:
Portable terminal sends the message of carrying path mtu to data gateway;
Data gateway is chosen Actual path MTU according to path mtu of self advising and the message of carrying path mtu that receives;
The described message that will carry described Actual path MTU sends to portable terminal and comprises:
The message that data gateway will carry described Actual path MTU sends to portable terminal.
22, system according to claim 19 is characterized in that, described data gateway or service node are chosen Actual path MTU and comprised according to the received message of carrying path mtu:
Data gateway sends the message of carrying path mtu to service node;
Service node is chosen Actual path MTU according to path mtu of self advising and the message of carrying path mtu that receives;
The described message that will carry described Actual path MTU sends to portable terminal and comprises:
The message that service node will carry described Actual path MTU sends to portable terminal.
23, system according to claim 19 is characterized in that, described data gateway or service node are chosen Actual path MTU and comprised according to the received message of carrying path mtu:
Service node and data gateway send the message of carrying path mtu to the other side respectively, and according to received message of carrying path mtu and the MTU that self advises, choose Actual path MTU respectively;
The described message that will carry described Actual path MTU sends to portable terminal and comprises:
The message that service node will carry described Actual path MTU sends to portable terminal.
24, system according to claim 19 is characterized in that, this system also comprises: mobile management entity;
Described portable terminal sends the message of carrying path mtu to mobile management entity;
Described mobile management entity is according to the message of carrying path mtu that receives, portable terminal is carried out access authentication after, send the message of carrying path mtu to service node; And the message of carrying Actual path MTU that service node returns sent to portable terminal.
25, a kind of method of negotiating maximum transmission unit value of path is applied to it is characterized in that in the mobile packet network, comprises step: in data establishment of connection process, first network element receives the path mtu of second network element suggestion from second network element; The path mtu of the path mtu of more described first network element suggestion and the suggestion of described second network element is selected the path mtu that smaller value uses as reality in the path mtu value wherein.
26, method according to claim 25 is characterized in that, described first network element is portable terminal and/or data gateway, and second network element is a service node;
First network element from the path mtu that second network element receives the suggestion of second network element is: portable terminal and/or data gateway receive the path mtu that service node is advised from setting up the data connection response message of service node transmission;
The path mtu of the path mtu of more described first network element suggestion and the suggestion of described second network element, select the path mtu that smaller value uses as reality in the path mtu value wherein to be: path mtu of advising according to the service node that receives and the path mtu of self advising, the MTU that portable terminal and/or data gateway select less path mtu value to use as reality.
27, method according to claim 25 is characterized in that, also comprises step:
The described actual path mtu that uses is sent to portable terminal.
28, according to claim 25,26 or 27 described methods, it is characterized in that, in the process of setting up the data connection, set up the mobility management protocol of data connection by expansion and consult the path mtu value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101968895A CN101400085A (en) | 2007-09-30 | 2007-12-11 | Method, device and system for negotiating maximum transmission unit value of path |
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| CN200710149991.X | 2007-09-30 | ||
| CN200710149991 | 2007-09-30 | ||
| CNA2007101968895A CN101400085A (en) | 2007-09-30 | 2007-12-11 | Method, device and system for negotiating maximum transmission unit value of path |
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| CN101400085A true CN101400085A (en) | 2009-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101968895A Pending CN101400085A (en) | 2007-09-30 | 2007-12-11 | Method, device and system for negotiating maximum transmission unit value of path |
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| CN103023777A (en) * | 2012-11-27 | 2013-04-03 | 杭州华三通信技术有限公司 | Method and equipment for obtaining global minimum and maximum transmission unit values |
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| CN103475596B (en) * | 2013-08-30 | 2016-08-17 | 广州市动景计算机科技有限公司 | The data transmission method of middleware based on MTU value and mobile terminal and system |
| CN103475596A (en) * | 2013-08-30 | 2013-12-25 | 广州市动景计算机科技有限公司 | MTU (Maximum Transmission Unit)-based middleware and mobile terminal data transmission method and system |
| CN105530193A (en) * | 2014-09-30 | 2016-04-27 | 华为技术有限公司 | Method for determining maximum transmission unit of tunnel, network device and system |
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| CN109729039A (en) * | 2017-10-27 | 2019-05-07 | 中兴通讯股份有限公司 | negotiation fragmentation method and device of link management protocol |
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