CN105450710B - Method for establishing the direct communication of user to user in gateway - Google Patents
Method for establishing the direct communication of user to user in gateway Download PDFInfo
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Abstract
The present invention relates to a kind of methods of direct communication that user to user is established in the gateway of the access network based on software defined network.This method comprises: receiving the data from the first user, the transmission target of the data is second user；Judge whether the first user and second user are located at identical access network；In the case where being located at identical access network, counted in the given time by the data traffic of the first user to second user；Judge whether data traffic is greater than predetermined flow threshold；Data are forwarded to second user in the case where being greater than and send the request for establishing user-to-user communication to software defined network controller.Moreover, it relates to a kind of method for the direct communication for establishing user to user in the software defined network controller of the access network based on software defined network.Based on technical solution of the present invention, the delay of data transmission between user can be reduced, increase the efficiency of network transmission, improve the utilization rate of network.
Description
Technical field
The present invention relates to network communication technologies, more particularly to the user couple in the access network based on software defined network
The direct communication of user.
Background technique
In current multiservice broadband access network network (MSBN), IP layers of user to user (user- below are not allowed
To-user communication), for example, the direct communication in the data link layer of access network protocol stack, the i.e. user to user of layer two is
It is not allowed to.Even two users in an identical access net, the business between them must also transmit first
Wideband network gateway (BNG) is given, then returns to another user.
Fig. 1 shows a kind of transmission mode of existing access network, wherein at Broadband Remote Access Server (BRAS)
Or be connected at wideband network gateway multiple switch, access node, optical line terminal (Optical line terminal:
OLT) and the intermediate devices such as optical network unit (Optical network unit:ONU), those intermediate devices again with each user
It is connected.Meanwhile the Broadband Remote Access Server or wideband network gateway are also connected with internet.It usually sets beyond the clouds
It is equipped with AAA (verifying, authorization and accounting) server, strategic server and, for example, DHCP (dynamic host configuration protocol) server
Other application server.As shown, user 1 and user 2 are under the jurisdiction of the same access node (Access Node:AN) 1.
However, user 1 needs first to send data via access node and interchanger when user 1 and user 2 carry out data transmission
To Broadband Remote Access Server perhaps wideband network gateway then again by Broadband Remote Access Server or broadband networks network diagram
It closes and the data is returned into user 2 via interchanger and access node.This all business require to access via broad band remote
The phenomenon that server or wideband network gateway are returned has become a technical bottleneck.It not only increases communication
Delay, reduce access network utilization rate, also limit the implementation of some value-added services.
For example, current multiservice broadband access network network can not only support traditional high-speed Internet business, additionally it is possible to
Support Mobile backhaul business, and certain low delays of Mobile backhaul business need and/or high handling capacity.However, in multi-service
In broadband access network, wideband network gateway must be sent to by the business of the X2 interface between multiple base stations first, then return
It is transmitted to other base stations, it is thus evident which results in very big delays, and also increase for the biggish of wideband network gateway
Load.
Therefore, if certain business are not needed to transfer to wideband network gateway first and be returned again, this will extremely be had
Benefit.It is envisioned that the direct communication of user to user will be required in following access network.
On the other hand, software defined network (SDN) and network function virtualization (NFV) are that the current hot topic of industry is main
Topic.In software defined network, the device of data Layer becomes simpler and is used only for based on flowing/forwarding table come forwarding number
According to, and control layer is then centralized.Software defined network allows the network to adapt dynamically to the needs using with business, also
It is so that Network Programmable.And network function virtualization refers to that dedicated or special hardware platform will be currently running in
Network or communications applications be transplanted in the cloud infrastructure of virtualization.
Following access network can be the network based on software defined network.Fig. 2 shows be based on software defined network
Access network transmission mode, it is different from Fig. 1, a software defined network controller is increased in Fig. 2, can be with soft
The form of part or hardware is located in the infrastructure in cloud.All control functions in access network-based control layer can all collect
In into the software defined network controller, and intermediate device (including access node and interchanger etc.) then becomes simply forwarding
Device forwards data by the flow meter configured by software defined network controller.It can be seen that being based on software definition
In the access network of network, the direct communication of user to user is possible.For example, the user couple between user 1 and user 2
User's communication can be done directly by the control of software defined network controller by access node 1.
Summary of the invention
However, there are no a kind of for realizing in the access network based on software defined network in protocol stack up to now
The concrete scheme of the direct communication of the user to user of middle layer one or layer two.Therefore, the present invention will solve this problem.
The purpose of the present invention is to provide a kind of to establish in the gateway of the access network based on software defined network
The method of the direct communication of user to user, the method are capable of deciding whether to need to carry out user to user within the access network
Communication and request software defined network controller establish the user-to-user communication.In addition, the present invention also aims to mention
The direct of user to user is established in the software defined network controller of the access network based on software defined network for a kind of
The method of communication, the method can determine the optimal path carried out data transmission between user and established based on the optimal path
The direct communication of user to user.The delay that data are transmitted between user, the effect for increasing network transmission can be reduced through the invention
Rate.
To achieve the goals above, the first aspect of the present invention provides a kind of in the access net based on software defined network
The method that the direct communication of user to user is established in the gateway of network, the described method comprises the following steps: a) receiving and comes from
The data of first user, the transmission target of the data are second user；B) judge first user and the second user
Whether identical access network is located at；C) the case where first user and the second user are located at identical access network
Under, it is counted in the given time by the data traffic of first user to the second user；D) judge the data traffic
Whether predetermined flow threshold is greater than；E) in the case where the data traffic is greater than the flow threshold to described second
User forwards the data and sends the request for establishing user-to-user communication to software defined network controller.Pass through
The above method, the present invention are advantageously led to according to the data traffic between user to determine whether needing to request to establish user to user
Letter.When the data traffic between user is larger, it can advantageously subtract small data transmission by establishing user-to-user communication
Delay and the efficiency for increasing data transmission.And when only being transmitted with fragmentary data between user, then use traditional warp
The mode forwarded by gateway, to reduce (such as access node, interchanger or optical link in intermediate network devices
Terminal etc.) forward-path quantity.
Preferably, according to the present invention establish user in the gateway of the access network based on software defined network
To in the method for the direct communication of user, if it is judged that first user and the second user position in the step b)
The method is then jumped out among different access networks and is forwarded the data on to except the access network.Pass through this
Kind mode can be handled in time to be sent target in the data accessed except network and terminates in time for establishing user couple
The method of user's communication, to avoid unnecessary operation and delay.
It is further preferred that in being built in the gateway of the access network based on software defined network according to the present invention
In the method for the direct communication of vertical user to user, the step c) is the following steps are included: c1) first user with it is described
In the case that second user is located at identical access network, judge in the gateway with the presence or absence of by first user
It is sent to the business record of the second user, the business record includes the mark of first user and the second user
When knowing, being sent to the current residual of recorded data traffic and timer of the second user by first user
Between；C2) there are the business record, judge whether the current residual time is zero；C3) described current surplus
In the case that the remaining time is not described zero, the flow of the data is increased to the data traffic in the business record
In.It in this way being capable of the data traffic in determining time range advantageously between counting user.When between user
Do not carry out data transmission not instead of fifty-fifty, when being transmitted on a large scale whithin a period of time, this mode can be advantageously
User-to-user communication is dynamically set up in time.
It is further preferred that in being built in the gateway of the access network based on software defined network according to the present invention
In the method for the direct communication of vertical user to user, in the case where the business record is not present, in the gateway
Establish the business record and skip to the step c3), wherein the data traffic in the business record is arranged to
Data traffic initial value, and the current residual time of the timer is arranged to the predetermined time.
It is further preferred that in being built in the gateway of the access network based on software defined network according to the present invention
In the method for the direct communication of vertical user to user, in the case where the current residual time is zero, by the data traffic
It is set as the data traffic initial value, the current residual time is set as the predetermined time and jumps out the step c).
It is further preferred that in being built in the gateway of the access network based on software defined network according to the present invention
In the method for the direct communication of vertical user to user, jumped in the case where the data traffic is not more than the data traffic threshold values
Out the method and the data are forwarded to the second user.In this way can the data traffic between user compared with
The method for establishing user-to-user communication is jumped out in the case where small in time.
In addition, to additionally provide a kind of software in the access network based on software defined network fixed for the second aspect of the present invention
The method that the direct communication of user to user is established in adopted network controller, the described method comprises the following steps: A) receive come from
The request for being used to establish the user-to-user communication by the first user to second user of gateway；C) generate be used to indicate by
The regular of optimal path of first user to the second user configures message；D) the rule configuration message is sent to
At least one intermediate network devices in network are accessed to configure the forwarding table in the intermediate network devices.Pass through above-mentioned side
Method, the present invention establish the optimal data transmission route between user advantageous by the forwarding table in configuration intermediate network devices
Diameter.Intermediate network devices become simple retransmission unit as a result, to further improve the speed of data transmission.
Preferably, in the software defined network controller in the access network based on software defined network according to the present invention
In the method for the middle direct communication for establishing user to user, in the step A) further comprising the steps of later: B) described in judgement
Whether the first user and the second user are located in identical passive optical network, in first user and the second user
The method is continued to execute in the case where not being located in identical passive optical network.Phase can be located in user in this way
Seek more quick data transfer mode in the case where same passive optical network.
It is further preferred that in the software defined network in the access network based on software defined network according to the present invention
It is established in controller in the method for the direct communication of user to user, in first user with the second user positioned at identical
Passive optical network in the case where execute following steps: i) judge first user and can the second user establish light
Direct communication of the network unit to optical network unit；Ii the optical network unit can) established to the direct of optical network unit
It is sent to corresponding optical line terminal for establishing the optical network unit to the direct logical of optical network unit in the case where communication
The order of letter.A possibility that providing the communication for optical network unit being established between user to optical network unit in this way.
Since the communication of optical network unit to optical network unit is the communication only by photosphere, data transmission can be greatly increased
Speed.
It is further preferred that in the software defined network in the access network based on software defined network according to the present invention
It is established in controller in the method for the direct communication of user to user, the optical network unit can not established to optical-fiber network list
The order for local forward rule to be arranged is sent in the case where the communication of member to corresponding optical line terminal.Due to local forwarding
Rule refers to the only communication via optical line terminal, therefore can also increase the speed of data transmission to a certain extent.
It is further preferred that in the software defined network in the access network based on software defined network according to the present invention
It is established in controller in the method for the direct communication of user to user, the communication of the optical network unit to optical network unit is not
By the communication of the pure photosphere of the optical line terminal.
It is further preferred that in the software defined network in the access network based on software defined network according to the present invention
It is established in controller in the method for the direct communication of user to user, the local forward rule passes through the light for establishing
The communication that photosphere is returned again to slave photosphere to electric layer of line terminal.
It is further preferred that in the software defined network in the access network based on software defined network according to the present invention
Established in controller in the method for the direct communication of user to user, the intermediate network devices be access node, interchanger or
Person's optical line terminal.Since intermediate network devices in the present invention are as just simple retransmission unit, by this
Mode can greatly simplify the control function of access node, interchanger or optical line terminal.
It is further preferred that in the software defined network in the access network based on software defined network according to the present invention
It is established in controller in the method for the direct communication of user to user, the software defined network controller is arranged on cloud
In infrastructure.In this way, the control function for implementing method of the invention can be arranged to cloud, to realize
The control of centralization, and avoid the failure due to some intermediate network devices and influence entirely to access network-based control function
Energy.
According to the present invention, so that the data transmission between user need not pass through aggregation networks part and gateway, to drop
Low data transfer delay and the efficiency for increasing access network.Meanwhile more increasings can be developed again based on these advantages
Value business, such as point-to-point service, X2 Mobile backhaul etc..
Detailed description of the invention
Fig. 1 shows a kind of transmission mode of existing access network；
Fig. 2 shows the transmission modes of the access network based on software defined network；
Fig. 3 shows a kind of flow chart of the direct communication for establishing user to user of embodiment according to the present invention；
And
What Fig. 4 showed another embodiment according to the present invention establishes user to user in passive optical-fiber network
The flow chart of direct communication.
Specific embodiment
Fig. 3 shows a kind of flow chart of the direct communication for establishing user to user of embodiment according to the present invention.
It is logical that the user to user being under the jurisdiction of between the first user and second user of the same access node 1 is illustratively established herein
Letter, and here, the end user of layer two or layer one that the direct communication of user to user is illustratively communication protocol stack is led to
Letter.
In step S301, the first user connects the data for needing to be sent to second user via the first user is subjected
Ingress 1 is forwarded to wideband network gateway.Here, can also have in others between access node 1 and wideband network gateway
Between the network equipment, such as interchanger etc..It is set in addition, wideband network gateway also can illustratively be replaced with other gateways
It is standby.
In step s 302, wideband network gateway judges whether the first user and second user are located at identical access network
In.For example, wideband network gateway can parse the source IP address (i.e. the IP address of the first user) and mesh of data from data
It marks IP address (i.e. the IP address of second user), to analyze whether the first user and second user are located at identical access net
Network.
In the embodiment shown in fig. 3, the first user and second user are located at identical access network.It therefore, will be
The data traffic that second user is sent to by the first user is counted in predetermined time.
Specifically, in step S303, judging, which whether there is in wideband network gateway, is sent to second by the first user
The business record of user, the business record include the mark of first user and second user, by first user transmission
To the current residual time of the recorded data traffic and timer of the second user.Here, if the first user
Forward direction second user be transmitted across data, then corresponding business record can be established in wideband network gateway.The business record example
Such as with<IP1, IP2, Num, timer count>form exist, wherein IP1 refers to the IP address of the first user；What IP2 referred to
It is the IP address of the first user；Num refers to that the first user is sent to the recorded data traffic of the second user,
The unit of Num for example can be the unit of byte or other characterize data uninterrupteds；And timer count refers to timing
The current residual time of device, the unit of timer count for example can be the unit of second or other characterization time spans.
If it is determined that obtaining having existed the business record for being sent to second user by the first user, then in step s 304
Continue to judge whether timer count is zero.
Unceasingly, it is not zero if it is determined that obtaining timer count, then in step S305, by currently transmitted data
Flow increases in Num.
However, judging during counting the data traffic by the first user to second user when in step S303
To there is no when being sent to the business record of second user by the first user, then need to establish corresponding business in step S311
Record<IP1, IP2, Num, timer count>.Wherein, data traffic initial value is set by Num, and timer count is set
It is set to the predetermined time for counting the data traffic for being sent to second user by the first user.It will can illustratively count herein
It is zero according to flow initial value equipment, and the predetermined time can be arranged according to different applications.
And during counting the data traffic by the first user to second user, when judgement obtains in step s 304
Timer count is zero, then in step s310 initializes Num and timer count, specifically, set data flow for Num
Measure initial value, and by timer count be provided for counting by the first user be sent to second user data traffic it is predetermined
Time.
So far the data traffic for counting be sent to second user by the first user in the given time is just completed, then,
It will judge whether Num is greater than predetermined threshold value in step S306.
If it is determined that obtaining Num greater than predetermined threshold value, then it represents that produced in current slot it is biggish by
First user is sent to the data volume of second user.Therefore wideband network gateway will be somebody's turn to do in step S307 to second user forwarding
Data and the request for establishing user-to-user communication is sent to software defined network controller.
If it is determined that obtaining Num no more than predetermined threshold value, then it represents that be sent to second user by the first user
Data volume, which does not arrive greatly, needs to establish special user-to-user communication.To, wideband network gateway in step S308 by data
Second user is forwarded to by second user access node 1 subjected.
In addition, if second user is located at except the access network where the first user, then will judge in step S302
It is not located in identical access network to the first user and second user, therefore access will be sent data in step S309
In internet except network and jump out method described above.
After step S307, software defined network controller is received to be used to establish by first from wideband network gateway
User to second user user-to-user communication request.Then in step S312, software defined network controller is generated
It is used to indicate the rule configuration message by the optimal path of first user to the second user.For example, software defined network
Network controller can find or calculate by Dijkstra (Di Jiesitela) algorithm within the access network for user
To the optimal path of the direct communication of user.
In step S313, rule configuration message is sent at least one in access network by software defined network controller
A intermediate network devices are to configure the forwarding table in intermediate network devices.Here, software defined network controller is to access node 1
Transmission rule configuration message<port 1, IP1, port m, IP2>.Wherein, port 1 is the port where the first user, and port m
It is the port where second user.It is envisioned that (the example when having multiple intermediate network devices between the first user and second user
Such as further include access node 2), software defined network controller will send rule configuration message to them respectively, so that they
It cooperates with each other to implement user-to-user communication.
In step S314, access node 1 will increase above-mentioned forward rule < port 1, IP1 according to rule configuration message,
Port m, IP2 >.To, it can directly be forwarded by access node 1 by the business of the first user to second user, and no longer pass through
It is forwarded by wideband network gateway.
By method shown in Fig. 3, advantageously according to the data traffic between user to determine whether needing to establish user
User is communicated.When the data traffic between user is larger, it can advantageously reduce number by establishing user-to-user communication
According to the delay of transmission and the efficiency of increase data transmission.And when only being transmitted with fragmentary data between user, then it uses
Traditional mode forwarded via gateway.
What Fig. 4 showed another embodiment according to the present invention establishes user to user in passive optical-fiber network
The flow chart of direct communication.
Be omitted in Fig. 4 in Fig. 3 judge whether in wideband network gateway need to establish the straight of user to user
Connect the process of letter.Herein it is assumed that carried out in Fig. 4 the process and it is determined that learn need to establish user to
The direct communication at family.
Therefore, in step S401, wideband network gateway to second user forwards data and to software defined network control
Device processed sends the request for establishing user-to-user communication.
After step S401, software defined network controller receives this for establishing the request of user-to-user communication.
Then, in step S402, it is identical passive that software defined network controller judges whether the first user is located at second user
Optical-fiber network.For example, there is address information<IP in software defined network controller, and AN/OLT, port index, ONU index>.
Wherein, IP refers to the IP address of user；AN/OLT refers to user is under the jurisdiction of which access node or optical line terminal；End
Stomochord, which draws, refers to which port user is connected to；Optionally, ONU index refers to that user is connected on the same port
Which optical network unit.Then, by comparing the first user and two IP of second user whether in identical AN/OLT
Identical port in can judge whether the first user and second user are located at identical passive optical network (Passive
Optical Network:PON) in.
In the case where the first user and second user are not located in identical PON, software defined network controller is in step
The optimal of the direct communication for user to user within the access network is found or calculated respectively in rapid S403 and step S404
Path and at least one intermediate network devices send rule configuration message.Wherein at least one intermediate network devices can
It is access node, interchanger etc..
However, software defined network controller exists in the case where the first user and second user are located in identical PON
The first user is continued checking in step S405 and direct communication that whether second user can establish ONU to ONU in photosphere.
It is sent to corresponding optical line terminal for establishing ONU pairs if it can establish ONU to the direct communication of ONU
The order of the communication of ONU.Specifically, in step S406, software defined network control order OLT is established in optical layer
Communication of the ONU to ONU.And in step S 407, software defined network controller to two ONU send rule configuration message with
Realize ONU to the direct communication of ONU.
If ONU can not be established to the direct communication of ONU, software defined network controller is whole to corresponding optical link
End sends the order for local forward rule to be arranged.Specifically, in step S408, software defined network control order exists
Local forward rule is established in OLT.And in step S409, local forward rule is sent to OLT.For example, this is locally forwarded
Rule can be with<src=ONU1, dst@=IP2, dst=ONUm>form, indicate that source optical network unit is ONU1, mesh
Mark address is IP2 and target optical network unit is ONUm.
By method shown in Fig. 4, provide established between user optical network unit to the communication of optical network unit or
A possibility that local forward rule is set.On the one hand, since the communication of optical network unit to optical network unit is only by light
The communication of layer, therefore the speed of data transmission can be greatly increased.On the other hand, optical network unit can not established to light net
In the case where the communication of network unit, since local forward rule refers to the only communication via optical line terminal,
The speed of data transmission can be increased to a certain extent.
In a kind of preferred embodiment of the method for the direct communication for establishing user to user according to the present invention, in
Between network equipment be access node, interchanger or optical line terminal.Therefore, by being set as turning by these intermediate network devices
Transmitting apparatus can greatly simplify the control function of access node, interchanger or optical line terminal.
It is soft in a kind of preferred embodiment of the method for the direct communication for establishing user to user according to the present invention
Part defines network controller and is arranged in the infrastructure in cloud, such as in server beyond the clouds.Therefore, by that will implement
The control function setting of method of the invention can be realized the control of centralization to cloud, and avoid due to some mid-level net
The failure of network device and influence entirely to access network-based control function.
Although specific embodiments of the present invention have been described above, those skilled in the art can be in appended power
Benefit makes various changes and modifications in the range of requiring.
Claims (14)
1. a kind of method for the direct communication for establishing user to user in the access network based on software defined network, the side
Method is realized by gateway, the described method comprises the following steps:
A) data from the first user are received, the transmission target of the data is second user；
B) judge whether first user and the second user are located at identical access network；
C) it in the case where first user and the second user are located at identical access network, counts in the given time
By the data traffic of first user to the second user；
D) judge whether the data traffic is greater than predetermined flow threshold；
E) in the case where the data traffic is greater than the flow threshold to the second user forward the data and to
Software defined network controller sends the request for establishing user-to-user communication.
2. the method according to claim 1, wherein if it is judged that first user in the step b)
It is located at then to jump out the method among different access networks and forward the data on to described from the second user and connects
Enter except network.
3. the method according to claim 1, wherein the step c) the following steps are included:
C1) in the case where first user and the second user are located at identical access network, judge in the gateway
With the presence or absence of the business record for being sent to the second user by first user in equipment, the business record includes described
The mark of first user and the second user, the recorded data that the second user is sent to by first user
The current residual time of flow and timer；
C2) there are the business record, judge whether the current residual time is zero；
C3) in the case where being not zero the current residual time, the flow of the data is increased in the business record
The data traffic in.
4. according to the method described in claim 3, it is characterized in that, be not present the business record in the case where, described
The business record is established in gateway and skips to the step c3), wherein the data flow in the business record
Amount is arranged to data traffic initial value, and the current residual time of the timer is arranged to the predetermined time.
5. according to the method described in claim 4, it is characterized in that, in the case where the current residual time is zero, by institute
State that data traffic is set as the data traffic initial value, the current residual time is set as the predetermined time and jumps out institute
State step c).
6. the method according to claim 1, wherein being not more than the feelings of the flow threshold in the data traffic
The method is jumped out under condition and forwards the data to the second user.
7. a kind of method for the direct communication for establishing user to user in the access network based on software defined network, the side
Method is realized by software defined network controller, the described method comprises the following steps:
A the request for being used to establish the user-to-user communication by the first user to second user from gateway, institute) are received
Request is stated in the case where being greater than predetermined flow threshold by the data traffic of first user to the second user
It is received；C the rule configuration message being used to indicate by the optimal path of first user to the second user) is generated；
D the rule configuration message) is sent at least one intermediate network devices in access network to configure the centre
Forwarding table in network equipment.
8. the method according to the description of claim 7 is characterized in that in the step A) further comprising the steps of later:
B) judge whether first user and the second user are located in identical passive optical network, in first user
The method is continued to execute in the case where not being located in identical passive optical network with the second user.
9. according to the method described in claim 8, it is characterized in that, in first user with the second user positioned at identical
Passive optical network in the case where execute following steps:
I) judge first user and the second user can establish optical network unit to optical network unit direct communication；
Ii) whole to corresponding optical link in the case where direct communication of the optical network unit to optical network unit can be established
End send for establish the optical network unit to optical network unit direct communication order.
10. according to the method described in claim 9, it is characterized in that, the optical network unit can not be established to optical-fiber network
The order for local forward rule to be arranged is sent to corresponding optical line terminal in the case where the communication of unit.
11. according to the method described in claim 9, it is characterized in that, the communication of the optical network unit to optical network unit is
Without the communication of the pure photosphere of the optical line terminal.
12. according to the method described in claim 10, it is characterized in that, local forward rule passes through the optical link for establishing
The communication that photosphere is returned again to slave photosphere to electric layer of terminal.
13. the method according to the description of claim 7 is characterized in that the intermediate network devices be access node, interchanger or
Person's optical line terminal.
14. the method according to the description of claim 7 is characterized in that the software defined network controller is arranged on cloud
Infrastructure in.
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| CN103746925A (en) * | 2013-12-13 | 2014-04-23 | 北京邮电大学 | FiWi converged network and communication method based on FiWi converged network |
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