CN109088833A - A kind of communication means and device - Google Patents
A kind of communication means and device Download PDFInfo
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- CN109088833A CN109088833A CN201710449243.7A CN201710449243A CN109088833A CN 109088833 A CN109088833 A CN 109088833A CN 201710449243 A CN201710449243 A CN 201710449243A CN 109088833 A CN109088833 A CN 109088833A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
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Abstract
The embodiment of the invention provides a kind of communication means and device, which includes: to receive the data packet from first terminal, wherein data packet carries the address information of second terminal；According to the address information of second terminal, twoth EPC corresponding with second terminal is inquired in local routing table；If non-first EPC of the 2nd EPC, by the generic route encapsulation gre tunneling between the 2nd EPC, the 2nd EPC is delivered a packet to, and data packet is transmitted to second terminal by the 2nd EPC.To effectively shorten the communication delay between EPC, improve data transfer efficiency, and then the user experience is improved.
Description
Technical field
The present embodiments relate to the communications field more particularly to a kind of communication means and device.
Background technique
Currently, the intercommunication between evolution block core net (Evolved Packet Core, EPC) in the prior art, usually
It is source EPC by SGI interface sending data packet, is forwarded via more switching equipment, then received by purpose EPC.
Obviously, EPC in the prior art is carried out in communication process, since message needs to be forwarded through excessive equipment, because
This, the communication process between EPC has seriously affected user experience there are very big delay.
Summary of the invention
The embodiment of the present invention provides a kind of communication means, and the communication delay between EPC to solve the prior art is big, user
The problems such as experience difference.
To solve the above-mentioned problems, the invention discloses a kind of communication means, are applied to the first EPC, which comprises
Receive the data packet from first terminal, wherein data packet carries the address information of second terminal；
According to the address information of second terminal, twoth EPC corresponding with second terminal is inquired in local routing table；
If non-first EPC of the 2nd EPC, by the generic route encapsulation gre tunneling between the 2nd EPC, by data packet
It is sent to the 2nd EPC, and data packet is transmitted to second terminal by the 2nd EPC.
In a preferred embodiment of the invention, before the step of receiving the data packet from first terminal, into one
Step includes:
Pre-establish gre tunneling；And
By the address information of the first EPC write-in local routing table corresponding with the address information of terminal of belonging first EPC；
By the address information of the 2nd EPC write-in local routing table corresponding with the address information of terminal of belonging 2nd EPC.
In a preferred embodiment of the invention, by the generic route encapsulation gre tunneling between the 2nd EPC,
The step of delivering a packet to two EPC specifically includes:
Data packet is subjected to GRE encapsulation, obtains GRE data packet；
And GRE data packet is subjected to IP encapsulation, obtain IP data packet.
By gre tunneling, IP data packet is sent to the 2nd EPC, so that IP data packet is carried out IP decapsulation by the 2nd EPC
Afterwards, then by the IP data packet after decapsulation GRE decapsulation processing is carried out, to obtain data packet, and delivers a packet to second
Terminal.
In a preferred embodiment of the invention, by the generic route encapsulation gre tunneling between the 2nd EPC,
The step of delivering a packet to two EPC further comprises:
Logical identifier is added to data packet, logical identifier issues the data of second terminal for unique identification first terminal
Packet, so that the data packet for carrying logical identifier received is sent to second terminal by the 2nd EPC.
In a preferred embodiment of the invention, method further comprises:
If the 2nd EPC is the first EPC, confirm that data packet is downlink data packet；
Data packet is sent to second terminal by internal interface.
According to another aspect of the present invention, a kind of communication device is provided, the first EPC is applied to, described device includes:
Receiving module, for receiving the data packet from first terminal, wherein data packet carries the address of second terminal
Information；
Enquiry module is inquired corresponding with second terminal for the address information according to second terminal in local routing table
The 2nd EPC；
Sending module passes through the generic route encapsulation GRE between the 2nd EPC if being used for non-first EPC of the 2nd EPC
Tunnel delivers a packet to the 2nd EPC, and data packet is transmitted to second terminal by the 2nd EPC.
In a preferred embodiment of the invention, device further comprises:
Module is established, for pre-establishing gre tunneling；And
Writing module, for writing the address information of the first EPC is corresponding with the address information of terminal of belonging first EPC
Enter local routing table；And by the address information of the 2nd EPC it is corresponding with the address information of terminal of belonging 2nd EPC write-in
Local routing table.
In a preferred embodiment of the invention, sending module is further used for:
Data packet is subjected to GRE encapsulation, obtains GRE data packet；
And GRE data packet is subjected to IP encapsulation, obtain IP data packet.
By gre tunneling, IP data packet is sent to the 2nd EPC, so that IP data packet is carried out IP decapsulation by the 2nd EPC
Afterwards, then by the IP data packet after decapsulation GRE decapsulation processing is carried out, to obtain data packet, and delivers a packet to second
Terminal.
In a preferred embodiment of the invention, sending module is further used for:
Logical identifier is added to data packet, logical identifier issues the data of second terminal for unique identification first terminal
Packet, so that the data packet for carrying logical identifier received is sent to second terminal by the 2nd EPC.
In a preferred embodiment of the invention, device further comprises:
Confirmation module confirms that data packet is downlink data packet if being the first EPC for the 2nd EPC；
Correspondingly, sending module is further used for data packet being sent to second terminal by internal interface.
Compared with prior art, by receiving the data packet from first terminal in the present invention, wherein data packet carries
The address information of second terminal；According to the address information of second terminal, inquired in local routing table corresponding with second terminal
2nd EPC；If non-first EPC of the 2nd EPC, by the generic route encapsulation gre tunneling between the 2nd EPC, by data packet
It is sent to the 2nd EPC, and data packet is transmitted to second terminal by the 2nd EPC.To which the communication effectively shortened between EPC is prolonged
When, improve data transfer efficiency, and then the user experience is improved.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of flow chart of communication means of the embodiment of the present invention；
Fig. 2 is the equipment of the embodiment of the present invention connection schematic diagram；
Fig. 3 is a kind of structural block diagram of communication device of the embodiment of the present invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Referring to Fig.1, a kind of flow chart of communication means of the embodiment of the present invention is shown, this method is applied to the first EPC,
It can specifically include following steps:
Step 101, the data packet from first terminal is received, wherein data packet carries the address information of second terminal.
Specifically, in an embodiment of the present invention, the first EPC belonging to first terminal, that is, first terminal access first
EPC。
In an embodiment of the present invention, the first EPC receives the data packet that first terminal is sent, the destination address of the data packet
For the address information of second terminal, wherein address information includes but is not limited to: the IP address and subnet mask of second terminal.
Step 102, according to the address information of second terminal, corresponding with second terminal second is inquired in local routing table
EPC。
Specifically, in an embodiment of the present invention, the first EPC passes through inquiry local according to the address information of second terminal
Routing table confirms twoth EPC corresponding with second terminal.In an embodiment of the present invention, it is recorded in local routing table purposeful
The corresponding relationship of address and next hop address, destination address are terminal address, and next hop address is to issue destination address pair
The address of the corresponding EPC of the terminal answered.
Step 103, if non-first EPC of the 2nd EPC, by the generic route encapsulation gre tunneling between the 2nd EPC,
The 2nd EPC is delivered a packet to, and data packet is transmitted to second terminal by the 2nd EPC.
Specifically, in an embodiment of the present invention, the first EPC can confirm that second terminal is by inquiry local routing table
Terminal under no the first EPC for access.If confirmation second terminal does not access the first EPC, that is, non-first EPC of the 2nd EPC, then the
One EPC can pass through the generic route encapsulation (Generation Routing Encapsulation, GRE) between the 2nd EPC
Tunnel delivers a packet to the 2nd EPC.
After 2nd EPC receives data packet, data packet is parsed, and the data packet after parsing is transmitted to second eventually
End.Specific resolving will be described in detail in the following embodiments, not repeat herein.
To sum up, the technical solution in the embodiment of the present invention, by receiving the data packet from first terminal, wherein data
Packet carries the address information of second terminal；According to the address information of second terminal, inquired in local routing table with second eventually
Hold corresponding 2nd EPC；If non-first EPC of the 2nd EPC, by the generic route encapsulation gre tunneling between the 2nd EPC,
The 2nd EPC is delivered a packet to, and data packet is transmitted to second terminal by the 2nd EPC.To effectively shorten between EPC
Communication delay, improve data transfer efficiency, and then the user experience is improved.
In addition, in a preferred embodiment of the invention, before the step of receiving the data packet from first terminal,
Further comprise:
Pre-establish gre tunneling；And
By the address information of the first EPC write-in local routing table corresponding with the address information of terminal of belonging first EPC；
By the address information of the 2nd EPC write-in local routing table corresponding with the address information of terminal of belonging 2nd EPC.
In a preferred embodiment of the invention, by the generic route encapsulation gre tunneling between the 2nd EPC,
The step of delivering a packet to two EPC specifically includes:
Data packet is subjected to GRE encapsulation, obtains GRE data packet；
And GRE data packet is subjected to IP encapsulation, obtain IP data packet.
By gre tunneling, IP data packet is sent to the 2nd EPC, so that IP data packet is carried out IP decapsulation by the 2nd EPC
Afterwards, then by the IP data packet after decapsulation GRE decapsulation processing is carried out, to obtain data packet, and delivers a packet to second
Terminal.
In a preferred embodiment of the invention, by the generic route encapsulation gre tunneling between the 2nd EPC,
The step of delivering a packet to two EPC further comprises:
Logical identifier is added to data packet, logical identifier issues the data of second terminal for unique identification first terminal
Packet, so that the data packet for carrying logical identifier received is sent to second terminal by the 2nd EPC.
In a preferred embodiment of the invention, method further comprises:
If the 2nd EPC is the first EPC, confirm that data packet is downlink data packet；
Data packet is sent to second terminal by internal interface.
In order to make those skilled in the art better understand communication means of the invention, carried out below with specific embodiment detailed
It is thin to illustrate.
Referring to Fig. 2, the equipment connection schematic diagram in the embodiment of the present invention is shown.In Fig. 2:
Terminal A (first terminal i.e. in the embodiment of the present invention) is connect by eNB1 (Evolved NodeB, evolved base station)
Enter EPC1 (the first EPC i.e. in the embodiment of the present invention).Terminal B (second terminal i.e. in the embodiment of the present invention) is connect by eNB2
Enter EPC2 (the 2nd EPC i.e. in the embodiment of the present invention).And there is gre tunneling and terminal mutual visit between EPC1 and EPC2
Designated lane, wherein terminal mutual visit designated lane be existing embodiment in transmission path, that is, by multiple switching equipment into
The forwarding of row data packet.It should be noted that Fig. 2 in the embodiment of the present invention is only schematic example, in other embodiments,
There may be multiple EPC, multiple terminals and base stations, and which is not limited by the present invention.
Specifically, in an embodiment of the present invention, specific implementation process includes:
Firstly, EPC1 and EPC2 pre-establish gre tunneling.Specifically, in an embodiment of the present invention, gre tunneling can also
The referred to as tunnel SGI-GRE, the gre tunneling are established based on the port SGI between EPC.That is, the prior art is by the end SGI
Mouth sends data packet, then is forwarded via more equipment, then is received by the port SGI of opposite end EPC.In the embodiment of the present invention
EPC is then after sending data packet by the port SGI, and data packet enters gre tunneling and transmitted, and is sent directly to opposite end EPC.
Specifically, in an embodiment of the present invention, the address information of opposite end EPC is written in EPC1 in gre tunneling allocation list,
In an embodiment of the present invention, address information can be IP address information.EPC2 does same operation.In gre tunneling allocation list
After the completion of configuration, the GRE module in EPC can establish gre tunneling with corresponding EPC according to the destination address in allocation list.
Then, EPC1 and EPC2 carries out SGI routing table (local routing table i.e. in the embodiment of the present invention) respectively and is matched
It sets.Specifically, in an embodiment of the present invention, EPC1 is by the address information pair of its address information and all terminals of access EPC1
It should be written in local SGI routing table, and, by the terminal of EPC2 and belonging EPC2, the i.e. ground of all terminals of access EPC2
In the corresponding write-in local SGI routing table of location information.For example: in the SGI routing table of EPC1, wherein a routing are as follows: purpose
Address is the address information of terminal B, and corresponding next hop address is the address information of EPC2.In an embodiment of the present invention, ground
Location information includes but is not limited to IP address and subnet mask.The configuration of EPC2 is similar with EPC1, does not repeat herein.
After the completion of gre tunneling is established, terminal A and the data exchange process of terminal B are as follows:
If terminal A needs to send data packet to terminal B.Then terminal A will carry the address information of terminal B by eNB1
Data packet is sent to EPC1.EPC1 receives the data packet for carrying out self terminal A, and extracts destination address therein, that is, the ground of terminal B
Location information.
EPC1 judges whether terminal B is on-site terminal, that is, access the terminal of EPC1 according to the destination address.Specifically,
In an embodiment of the present invention, EPC1 confirms next hop address corresponding with the destination address by inquiry local SGI routing table
Whether the address for being EPC1.If so, can confirm that terminal B accesses EPC1, that is, the data packet is downlink data packet.EPC1 should
Data packet is sent to second terminal by internal interface.In another embodiment, if EPC1 passes through inquiry local SGI routing
Table confirms that next hop address corresponding with the destination address is the address information of EPC2.Then, data packet is passed through GRE tunnel by EPC1
Road is sent to EPC2.Specific transmission process is as follows:
The data packet GRE that terminal B is sent to by terminal A is packaged by ECP1, obtains GRE data packet.Again to GRE data
Packet carries out IP encapsulation, obtains IP data packet.Specific encapsulation process can refer to encapsulation scheme in the prior art, and the present invention is no longer superfluous
It states.
In one embodiment of the invention, EPC1 can also add logical identifier into IP data packet, the logical identifier
The data packet of terminal B is sent to for unique identification terminal A.
Then, EPC1 is sent IP data packet by the port SGI, and is transmitted to EPC2 by gre tunneling.
EPC2 receives IP data packet, and is parsed, and resolving is as follows:
After EPC2 receives IP data packet, it can confirm that data therein are GRE number by the outer layer message of detection IP encapsulation
According to.After IP data packet is carried out IP decapsulation by EPC2, the GRE data packet that will acquire transfers to GRE module to carry out at GRE decapsulation
Reason, to obtain data packet therein.Specific decapsulation process can be by realizing in the prior art, and the present invention repeats no more.
In one embodiment of the invention, if terminal A sends multiple data packets to terminal B, EPC1 is to multiple data
Bao Zhongjun is added with identical logical identifier, then multiple data packets can form logical data stream in gre tunneling.Implement at one
In example, EPC1 can also inform the data packet number for including in EPC2 data flow.EPC2 is receiving logic mark having the same
After the multiple data packets known, can determine whether the data packet number received is correct.If it is not, then being alerted to EPC1, and wait pre-
It fixes time.If in the given time, not receiving the data packet for being but, then it can confirm that link failure, EPC2 can pass through designated lane
Data interaction is carried out with EPC1.
Referring now still to Fig. 2, EPC2 extracts destination address, the i.e. address information of terminal B after getting data packet.EPC2 is looked into
After asking local SGI routing table, confirmation terminal B is on-site terminal.Then data packet is put into IP queue by EPC2, and terminal B is waited to call.
In conclusion the technical solution in the embodiment of the present invention, by receiving the data packet from first terminal, wherein
Data packet carries the address information of second terminal；According to the address information of second terminal, the inquiry and the in local routing table
Corresponding 2nd EPC of two terminals；If non-first EPC of the 2nd EPC passes through the generic route encapsulation GRE tunnel between the 2nd EPC
Road delivers a packet to the 2nd EPC, and data packet is transmitted to second terminal by the 2nd EPC.To effectively shorten EPC it
Between communication delay, improve data transfer efficiency, and then the user experience is improved.
Referring to Fig. 3, a kind of structural block diagram of communication device of the embodiment of the present invention is shown, which is applied to the
One EPC can specifically include with lower module:
Receiving module 301, for receiving the data packet from first terminal, wherein data packet carries second terminal
Address information.
Enquiry module 302, for the address information according to second terminal, inquiry and second terminal pair in local routing table
The 2nd EPC answered.
Sending module 303 passes through the generic route encapsulation between the 2nd EPC if being used for non-first EPC of the 2nd EPC
Gre tunneling delivers a packet to the 2nd EPC, and data packet is transmitted to second terminal by the 2nd EPC.
In a preferred embodiment of the invention, device further comprises:
Module (not shown) is established, for pre-establishing gre tunneling；And
Writing module (not shown), for by the ground of the address information of the first EPC and the terminal of belonging first EPC
The corresponding write-in local routing table of location information；And by the address of the address information of the 2nd EPC and the terminal of belonging 2nd EPC
The corresponding write-in local routing table of information.
In a preferred embodiment of the invention, sending module 303 is further used for:
Data packet is subjected to GRE encapsulation, obtains GRE data packet；
And GRE data packet is subjected to IP encapsulation, obtain IP data packet.
By gre tunneling, IP data packet is sent to the 2nd EPC, so that IP data packet is carried out IP decapsulation by the 2nd EPC
Afterwards, then by the IP data packet after decapsulation GRE decapsulation processing is carried out, to obtain data packet, and delivers a packet to second
Terminal.
In a preferred embodiment of the invention, sending module 303 is further used for:
Logical identifier is added to data packet, logical identifier issues the data of second terminal for unique identification first terminal
Packet, so that the data packet for carrying logical identifier received is sent to second terminal by the 2nd EPC.
In a preferred embodiment of the invention, device further comprises:
Confirmation module (not shown) confirms that data packet is downlink data packet if being the first EPC for the 2nd EPC；
Correspondingly, sending module 303 is further used for data packet being sent to second terminal by internal interface.
In conclusion the device in the embodiment of the present invention, by receiving the data packet from first terminal, wherein data
Packet carries the address information of second terminal；According to the address information of second terminal, inquired in local routing table with second eventually
Hold corresponding 2nd EPC；If non-first EPC of the 2nd EPC, by the generic route encapsulation gre tunneling between the 2nd EPC,
The 2nd EPC is delivered a packet to, and data packet is transmitted to second terminal by the 2nd EPC.To effectively shorten between EPC
Communication delay, improve data transfer efficiency, and then the user experience is improved.
For apparatus embodiments, since it is basically similar to the method embodiment, so be described relatively simple, it is related
Place illustrates referring to the part of embodiment of the method.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
The embodiment of the present invention can describe in the general context of computer-executable instructions executed by a computer, example
Such as program module.Generally, program module include routines performing specific tasks or implementing specific abstract data types, program,
Object, component, data structure etc..The present invention can also be practiced in a distributed computing environment, in these distributed computing rings
In border, by executing task by the connected remote processing devices of communication network.In a distributed computing environment, program mould
Block can be located in the local and remote computer storage media including storage equipment.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, commodity or the equipment that include a series of elements not only include that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, commodity or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in process, method, commodity or the equipment for including the element.
A kind of communication means provided by the present invention and device are described in detail above, it is used herein specifically
Principle and implementation of the present invention are described for a example, the present invention that the above embodiments are only used to help understand
Method and its core concept；At the same time, for those skilled in the art is being embodied according to the thought of the present invention
There will be changes in mode and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. a kind of communication means is applied to the first evolution block core net EPC, which is characterized in that the described method includes:
Receive the data packet from first terminal, wherein the data packet carries the address information of second terminal；
According to the address information of the second terminal, twoth EPC corresponding with the second terminal is inquired in local routing table；
If non-first EPC of the 2nd EPC, by the generic route encapsulation gre tunneling between the 2nd EPC,
The data packet is sent to the 2nd EPC, and the data packet is transmitted to the second terminal by the 2nd EPC.
2. the method according to claim 1, wherein the step of data packet of the reception from first terminal it
Before, further comprise:
Pre-establish the gre tunneling；And
By described of the write-in corresponding with the address information of terminal of belonging first EPC of the address information of the first EPC
Ground routing table；
By described of the write-in corresponding with the address information of terminal of belonging 2nd EPC of the address information of the 2nd EPC
Ground routing table.
3. the method according to claim 1, wherein the general routing by between the 2nd EPC
The step of encapsulating gre tunneling, the data packet is sent to two EPC, specifically includes:
The data packet is subjected to GRE encapsulation, obtains GRE data packet；
And the GRE data packet is subjected to IP encapsulation, obtain IP data packet.
By the gre tunneling, the IP data packet is sent to the 2nd EPC, so that the 2nd EPC is by the IP number
After carrying out IP decapsulation according to packet, then by the IP data packet progress GRE decapsulation processing after decapsulation, to obtain the data packet,
And the data packet is sent to the second terminal.
4. the method according to claim 1, wherein the general routing by between the 2nd EPC
The step of encapsulating gre tunneling, the data packet is sent to two EPC further comprises:
Logical identifier is added to the data packet, the logical identifier issues described second for first terminal described in unique identification
The data packet of terminal, so that the data packet for carrying the logical identifier received is sent to described by the 2nd EPC
Two terminals.
5. the method according to claim 1, wherein the method further includes:
If the 2nd EPC is the first EPC, confirm that the data packet is downlink data packet；
The data packet is sent to the second terminal by internal interface.
6. a kind of communication device, it is applied to the first evolution block core net EPC, which is characterized in that described device includes:
Receiving module, for receiving the data packet from first terminal, wherein the data packet carries the address of second terminal
Information；
Enquiry module, for the address information according to the second terminal, inquiry and the second terminal in local routing table
Corresponding 2nd EPC；
Sending module passes through the general routing between the 2nd EPC if being used for non-first EPC of the 2nd EPC
Gre tunneling is encapsulated, the data packet is sent to the 2nd EPC, and the data packet is transmitted to institute by the 2nd EPC
State second terminal.
7. device according to claim 6, which is characterized in that described device further comprises:
Module is established, for pre-establishing the gre tunneling；And
Writing module, for by the address information pair of the address information of the first EPC and the terminal of belonging first EPC
The local routing table should be written；And by the terminal of the address information of the 2nd EPC and belonging 2nd EPC
Address information is corresponding to be written the local routing table.
8. device according to claim 6, which is characterized in that the sending module is further used for:
The data packet is subjected to GRE encapsulation, obtains GRE data packet；
And the GRE data packet is subjected to IP encapsulation, obtain IP data packet.
By the gre tunneling, the IP data packet is sent to the 2nd EPC, so that the 2nd EPC is by the IP number
After carrying out IP decapsulation according to packet, then by the IP data packet progress GRE decapsulation processing after decapsulation, to obtain the data packet,
And the data packet is sent to the second terminal.
9. device according to claim 6, which is characterized in that the sending module is further used for:
Logical identifier is added to the data packet, the logical identifier issues described second for first terminal described in unique identification
The data packet of terminal, so that the data packet for carrying the logical identifier received is sent to described by the 2nd EPC
Two terminals.
10. device according to claim 6, which is characterized in that described device further comprises:
Confirmation module confirms that the data packet is downlink data packet if being the first EPC for the 2nd EPC；
Correspondingly, the sending module is further used for the data packet being sent to the second terminal by internal interface.
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