CN104426905A - Ethernet device and method by means of MAC addresses - Google Patents
Ethernet device and method by means of MAC addresses Download PDFInfo
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- CN104426905A CN104426905A CN201410258124.XA CN201410258124A CN104426905A CN 104426905 A CN104426905 A CN 104426905A CN 201410258124 A CN201410258124 A CN 201410258124A CN 104426905 A CN104426905 A CN 104426905A
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- ethernet
- mac address
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/66—Layer 2 routing, e.g. in Ethernet based MAN's
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/35—Switches specially adapted for specific applications
- H04L49/351—Switches specially adapted for specific applications for local area network [LAN], e.g. Ethernet switches
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/618—Details of network addresses
- H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
Abstract
The invention relates to an Ethernet device and method by means of MAC addresses, and particularly relates to an Ethernet device and method by means of MAC addresses which allow low-resource equipment to participate in the Ethernet and to transmit and receive information based on the MAC addresses to other equipment. The Ethernet device by means of MAC addresses is characterized by including a plurality of switches used for relaying groups in the Ethernet; a terminal used for broadcasting and transmitting register information to participate the Ethernet when at least one of the switches is started or reset, and determining the existence state of a service list manager based on the response result of the register information to determine the service retrieval manner; and other terminals used for transmitting and receiving information via the Ethernet based on the MAC addresses.
Description
Technical field
The present invention relates to one and utilize medium access control (media access control; Be called for short MAC) Ethernet device of address and method thereof.
Background technology
Existing based on controller local area network (Control Area Network; CAN) network of communication mode may face the situation being difficult to bear volume of transmitted data between each unit in vehicle future, therefore current extensively studying the technology about adopting Ethernet (Ethernet) mode, in the stabilized communication mode as network in vehicle of future generation.
When making the multiple electronic control unit (ECU) be arranged on vehicle build Ethernet by Ethernet chip (ethernet chip), needing structure to assist and making low-resource equipment also can participate in the Ethernet of Ethernet.
And each gross vehicle power supply is connected to each equipment of Ethernet switch information when connecting or close all is initialised, and therefore needs to improve this.
If improvement this problem and increase other microprocessors in Ethernet device, then need complicated calculation process, thus occur new problem.
Summary of the invention
Technical problem
For solving the above problems, object of the present invention also can participate in Ethernet for providing a kind of low-resource equipment, and equipment room can according to medium access control (media access control; Be called for short MAC) Ethernet device and the method thereof that utilize MAC Address of receiving and sending messages.
Technical scheme
According to the Ethernet device utilizing Media Access Control address of one aspect of the invention, it is characterized in that comprising: multiple switch, it is contained in the grouping of Ethernet for repeat packets; A terminal, when described multiple switch and form in the terminal of described Ethernet at least any one start or reset time, its broadcasting transmitting registration message, to participate in described Ethernet, and judge the gerentocratic existence of service list according to the response results of described registration message, to determine service retrieval mode; And other-end, it is received and sent messages with a described terminal by described Ethernet according to MAC Address.
The Ethernet device utilizing Media Access Control address according to a further aspect of the invention, is characterized in that comprising: multiple switch, and it is contained in the grouping of Ethernet for repeat packets; A terminal, when described multiple switch and form in the terminal of described Ethernet at least any one start or reset time, its message transfer, to participate in described Ethernet; And other-end, it is received and sent messages with a described terminal by described Ethernet according to MAC Address.
According to the Ethernet method utilizing Media Access Control address of another aspect of the invention, it is characterized in that comprising: when in multiple Ethernet switch at least any one starts or resets time terminal broadcast transmission Ethernet registration message step; Judge that described multiple Ethernet switch or other-end are to the step of described registration message with or without response; And judge service list manager according to the response results of described registration message, determine service retrieval mode, and according to the step that the MAC Address of described other-end is received and sent messages by Ethernet.
Technique effect
Utilize Ethernet device and the method thereof of MAC Address according to the present invention, the transfer of data of equipment room can be realized based on the MAC Address as data-link layer address system, the Ethernet comprising low-resource equipment can be formed, complicated superstructure can be minimized.
According to service list manager existence determination service retrieval mode, thus can Internet traffic be reduced, and because the increase of Ethernet switch shared device, replacing, deletion information, even if thus increase, change, sweep equipment also can build stable Ethernet.
For vehicle Ethernet, be initialised even if each gross vehicle power supply is connected, be connected to the facility information of Ethernet switch when cutting off, but still by when the link information of registration message Fast Reconstruction Ethernet switch receiving broadcasting transmitting after each equipment replacement.
In addition, substitute the ethernet module comprising microprocessor (micom) and Ethernet chip by Ethernet chip, thus can with minimum resource construction Ethernet.
The formation of Ethernet device can be minimized, can make to utilize the equipment of Ethernet by minimum resource construction Ethernet.
Beneficial effect of the present invention is not limited to above-mentioned effect, and those skilled in the art can clearly understand other effects NM from following explanation.
Accompanying drawing explanation
Fig. 1 is the existing open system interconnection of display (Open Systems InterconnectionReference Model; OSI) schematic diagram of reference model 7 Rotating fields and application example of the present invention;
Fig. 2 is display utilizes the packet configuration of the Ethernet of MAC Address schematic diagram according to embodiments of the invention;
Fig. 3 is display utilizes the embodiment of the Ethernet device of MAC Address block diagram according to embodiments of the invention;
Fig. 4 and Fig. 5 is display utilizes the Ethernet method of MAC Address flow chart according to embodiments of the invention.
Description of reference numerals
40: one terminals 10,20,30,50,60,70,80,90: other-end
100,200,300: switch
Embodiment
Describe the present invention with reference to the accompanying drawings in detail and utilize medium access control (media access control; Hereinafter referred to as MAC) Ethernet device of address and the preferred embodiment of method thereof.What in explanation of the present invention, judge to think related known formation or function illustrates the explanation of to omit when may obscure present subject matter this content.
Fig. 1 is the schematic diagram showing the communication structure that the concept map of existing OSI Reference Model 7 Rotating fields and breviary OSI7 Rotating fields obtain
OSI (Open Systems Interconnection ReferenceModel; OSI) 7 Rotating fields are defined as network protocol standard by the International Organization for Stand (ISO), when realizing practical communication system by OSI7 Rotating fields described in breviary, such as be configured to the structure of 3 to 5 layers, with the problem of the problem of resolution system inadequate resource or Rotating fields complexity.
With reference to the application example one shown in Fig. 1, by physical layer and data link layer building network layer, there is not agreement (the Internet Protocol using and interconnect between network; IP) upper layer of address etc., but realize communication according to MAC layer.
And with reference to the application example 2 shown in Fig. 1, can, as required at the multiple layer of upper increase of data link layer, make it possible to realize end to end communication (end to end) by MAC Address.That is, remove IP-based layer as required and realize communication.
Of the present invention utilize MAC Address Ethernet device and method in, the structure of application example one shown in Fig. 1 obtains the method for MAC Address, and application example 2 shown in Fig. 1 form as required when the upper increase various protocols of data link layer, still can according to MAC Address retrieve data transmitting-receiving object terminal, thus without the need to other addresses such as IP, only need can realize communication according to MAC Address, the Ethernet device of MAC Address and the method for utilizing of the present invention is such as applicable to vehicle Ethernet.
Of the present inventionly the request of serving in the terminal of the Ethernet device of MAC Address and providing of service is utilized not to be fixed on a direction, but the request two-wayly can carrying out serving and providing, for ease of explanation in detailed description of the present invention, a terminal is set to the terminal of request service, other-end is set to and provides the terminal of service to be described.
Fig. 2 is the display schematic diagram utilizing the packet configuration of the Ethernet of MAC Address of the present invention, as shown in Figure 2, the instruction that a terminal of request service is transmitted can comprise registration, registration deletion, retrieval, service provider requests, service provision request, ISP's list propagation and data transmission message.
Having multiple for providing the other-end of service in an example, being preferably contained in the some groups in image source group, audio-source group, control source group, image display group, audio playing apparatus group, control object device group, communication gate group and group of communication devices or multiple group.
Multiple other-end is assigned with group identification number (ID) when being classified into the groups such as image source, audio-source, control source, image display, audio playing apparatus, control object device, communication gate and communicator.
Such as use ' 2 ' system number setting group ID, the zero degree side of ' 2 ' represents image source, the first power of ' 2 ' represents audio-source, the quadratic power of ' 2 ' represents control source, the cube of ' 2 ' represents image display, the biquadratic of ' 2 ' represents audio playing apparatus, five powers of ' 2 ' represent control object device, to distinguish group ID, if now other-end plays the effect in image source and the source of control, then other-end can be expressed as ' 0b000101 ', if other-end plays image source simultaneously, audio-source, control source, image display, audio playing apparatus, the effect of control object device, then other-end is expressed as ' 0b111111 '.
Other-end does not belong to the group performing similar functions in Ethernet in another example, is the terminal only performing a kind of function, and now other-end can be assigned with the device id of unique setting in Ethernet.
That is, multiple other-end is assigned with group ID or device id.
In the instruction of a terminal transmission registration message be a terminal because reset wait and participate in Ethernet for the first time time for a terminal itself being registered to the message of Ethernet, registration deletion message is the message for deleting a terminal from Ethernet, and searching message is by the message of group ID retrieval for carrying out the other-end communicated for a terminal.
Terminal is service provider requests's transmission of messages to the service list manager of management service list in Ethernet, and the service list manager receiving service provider requests's message utilizes group ID or the other-end of device id retrieval for providing a terminal required service.
The service provision request message of a terminal transmission is the message of the other-end for retrieving the respective service provided needed for a terminal, when terminal transmission ISP list spreads news, service list manager receives ISP's list and spreads news, and ISP's list is transferred to a terminal.
Now, the function class of service provider requests's message is similar to searching message, but difference is to be transferred to service list manager, and this point is different from searching message.
The Ethernet device of MAC Address that utilizes of the present invention comprises: multiple switch, and its relaying is contained in the grouping of Ethernet; A terminal, when multiple switch and form Ethernet terminal at least any one start or reset time its broadcasting transmitting registration message, to participate in Ethernet; And other-end, it is received and sent messages with a terminal by Ethernet according to MAC Address.A terminal judges the gerentocratic existence of service list according to the response results of registration message, to determine service retrieval mode.
The respond style of following basis to the registration message of a terminal transmission is classified each embodiment, to illustrate that the present invention utilizes the Ethernet device of MAC Address.
The first embodiment according to Fig. 3, terminal 40 is by registration message broadcasting transmitting to switch 100,200,300 and other-end 10,20,30,50,60,70,80,90, and when response not to this registration message, a terminal 40 is judged as not presence service list management person.
Terminal 40 judge not exist the service list manager of response is made to registration message or service provider requests's message time, provide request message to switch 100,200,300 and other-end 10,20,30,50,60,70,80,90 broadcasting transmitting terminal 40 required service.
In an example, when the service provision request message of other-end 10 to terminal 40 broadcasting transmitting makes response, a terminal 40 obtains and stores the MAC Address of other-end 10, and the MAC Address according to the other-end 10 service provision request message being made to response is received and sent messages.According to MAC Address, a terminal 40 knows that other-end 10 provides special services, thus when transmitting for asking the service provision request message providing same services to other-end 10 unicast transmission service provision request message, instead of broadcasting transmitting.
Therefore when multiple switch 100, 200, 300 and form the terminal 10 of Ethernet, 20, 30, 40, 50, 60, 70, 80, in 90 at least any one start or reset time, a terminal 40 broadcast transmission services when initial provides request message, but because store the MAC Address of COS that the other-end 10 of making response to the service provision request message of broadcasting transmitting provides and other-end 10, therefore since then request message is provided without the need to broadcast transmission services, but to service provision request message being made to the other-end 10 unicast transmission service provision request message of response, therefore, it is possible to minimizing Internet traffic.
Below in conjunction with Fig. 3, the second embodiment is described, when switch 200 (the second switch) registration message to terminal 40 broadcasting transmitting adjacent with terminal 40 in multiple switch 100,200,300 makes response, the switch 200 registration message being made to response is judged as service list manager by a terminal, thus required service provider requests's message unicast is transferred to service list manager 200 by a terminal 40.
Now when a terminal 40 is received and sent messages with other-end 10,20,30,50,60,70,80,90, a terminal 40 is received and sent messages according to the MAC Address of other-end 10,20,30,50,60,70,80,90.
Now when a terminal 40 is received and sent messages with other-end 10,20,30,50,60,70,80,90, a terminal 40 is received and sent messages according to the MAC Address of other-end 10,20,30,50,60,70,80,90.
Registration and the information of deletion of other-end 10,20,30,50,60,70,80,90 is now shared as switch 100,300 not adjacent with terminal 40 in gerentocratic second switch 200 of service list and multiple switch 100,200,300.
Namely, as the increase of gerentocratic second switch 200 of service list and other-end 10,20,30,50,60,70,80,90 in switch 100,300 shared ethernet in Ethernet, replacing, deletion information, even if therefore the situations such as increase, replacing or deletion appear in other-end 10,20,30,50,60,70,80,90, also stable ethernet communication can be realized.
Below in conjunction with Fig. 3, the 3rd embodiment is described, a terminal 40 is at multiple switch 100, 200, 300 and form the terminal 10 of Ethernet, 20, 30, 40, 50, 60, 70, 80, in 90 at least any one starts or resets time broadcasting transmitting registration message, when not adjacent with a terminal 40 switch 100, 300 and not adjacent with a terminal 40 other-end 10, 20, 30, 70, 80, when any one in 90 makes response, registration message will be made to the switch 100 of response, 300 or other-end 10, 20, 30, 70, 80, 90 are judged as service list manager.
For the 3rd embodiment is described, suppose that not adjacent with terminal 40 registration message of the first switch 100 to terminal 40 broadcasting transmitting makes response.
In this case, first switch 100 is judged as service list manager by a terminal 40, and to as the gerentocratic first switch 100 unicast transmission service provider requests message of service list, as service list gerentocratic first switch 100, response is made to service provider requests's message that a terminal 40 is transmitted, to a terminal 40 transmission service supplier information.
As shown in Figure 4, the present invention utilizes the Ethernet method of MAC Address to comprise: the first step S100 of a terminal broadcast transmission registration message when at least any one switch in multiple Ethernet switch starts or reset; Judge that multiple Ethernet switch or other-end are to the second step S200 of registration message with or without response; And judge service list manager according to the response results of registration message, determine service retrieval mode, and according to the third step S300 that the MAC Address of other-end is received and sent messages by Ethernet.
Fig. 5 is the flow chart that concrete display utilizes the third step S300 of the Ethernet method of MAC Address, and to the response of the registration message of a terminal broadcast transmission, whether result illustrates each embodiment to basis below.
The present invention utilizes in the first embodiment of the Ethernet method of MAC Address, second step S200 judges whether to there is the response apparatus (multiple switch or the other-end) registration message of a terminal broadcast transmission being made to response, when there is not response apparatus, broadcast transmission services supplier searching message in step S301.ISP's searching message is the message to other-end transmission, is therefore different from the service provider requests's message to service list manager transmission.
Now according to other-end, to the response of ISP's searching message, whether result judges whether presence service supplier information in step s 302, when judged result be not presence service supplier information time return the step S301 of broadcast transmission services supplier searching message, and in step S303, be stored as the MAC Address of the other-end of respective service supplier when presence service supplier information, and receive and send messages with other-end according to MAC Address.
The present invention utilizes in the second embodiment of the Ethernet method of MAC Address, when the judged result of second step S200 is for existing response apparatus, judges that whether response apparatus is and broadcasting transmitting registration message switch that terminal is adjacent in step S305.When response apparatus is neighboring switch, neighboring switch is judged as service list manager by a terminal, and receives License Info from as the gerentocratic neighboring switch of service list in step S310.In step S315, a terminal is to as service list gerentocratic neighboring switch transmission service supplier request message, judges whether presence service supplier information in step s 320 as the gerentocratic neighboring switch of service list.When there is the Service provider information of the service provider requests's message corresponding to a terminal transmission, in step S330, a terminal storage is as the MAC Address of the other-end (response terminal) of ISP, receives and sends messages with other-end according to MAC Address.If now not presence service supplier information, then in step S325 as the gerentocratic neighboring switch of service list by service retrieval transmission of messages to other switches in Ethernet, or broadcasting transmitting is to secondary terminal.
The present invention utilizes in the 3rd embodiment of the Ethernet method of MAC Address, when there is the response apparatus registration message of a terminal broadcast transmission being made to response, but when response apparatus is not the switch adjacent to a terminal, the response apparatus registration message of broadcasting transmitting being made to response is judged as service list manager by a terminal, and receives service list manager License Info from service list manager in step S335.Then in step S340 a terminal to service list manager transmission service supplier request message, with request service supplier, in step S345, service list manager judges whether to there is the Service provider information corresponding to the service provider requests's message received from a terminal.When presence service supplier information, in step S350, a terminal storage is as the MAC Address of the other-end of ISP, communicates with other-end according to MAC Address.Otherwise, when not presence service supplier information in step S355 a terminal broadcast transmission searching message.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (15)
1. utilize an Ethernet device for MAC Address, it is characterized in that, comprising:
Multiple switch, it is contained in the grouping of Ethernet for repeat packets;
A terminal, when described multiple switch and form in the terminal of described Ethernet at least any one start or reset time, its broadcasting transmitting registration message, to participate in described Ethernet, and judge the gerentocratic existence of service list according to the response results of described registration message, to determine service retrieval mode; And
Other-end, it is received and sent messages with a described terminal by described Ethernet according to MAC Address.
2. the Ethernet device utilizing MAC Address according to claim 1, is characterized in that:
A described terminal is judged as not described service list manager when the response not to described registration message, thus to the service provision request message needed for described multiple switch and described other-end broadcasting transmitting, and obtain the MAC Address described service provision request message being made to the other-end of response, receive and send messages with the other-end making response to described service provision request message according to the MAC Address of the described other-end obtained.
3. the Ethernet device utilizing MAC Address according to claim 1, is characterized in that:
When a described terminal makes response adjacent to the switch of a described terminal to described registration message in described multiple switch, switch adjacent to a described terminal is judged as service list manager, and service provider requests's message unicast is transferred to described service list manager.
4. the Ethernet device utilizing MAC Address according to claim 3, is characterized in that:
Described service list manager, shares the log-on message of described other-end in Ethernet and deletion information with the switch in a described terminal non-conterminous in described multiple switch.
5. the Ethernet device utilizing MAC Address according to claim 1, is characterized in that:
When any one in the non-conterminous switch in a described terminal and described other-end of a described terminal makes response to described registration message, the switch or described other-end of described registration message being made to response are judged as service list manager, and to described service list manager unicast transmission service provider requests message.
6. utilize an Ethernet device for MAC Address, it is characterized in that, comprising:
Multiple switch, it is contained in the grouping of Ethernet for repeat packets;
A terminal, when described multiple switch and form in the terminal of described Ethernet at least any one start or reset time, its message transfer, to participate in described Ethernet; And
Other-end, it is received and sent messages with a described terminal by described Ethernet according to MAC Address.
7. the Ethernet device utilizing MAC Address according to claim 6, is characterized in that:
A described terminal broadcast message transfer, described message is the registration message containing initiation message, when the described message of service list manager to broadcasting transmitting makes response to described service list manager unicast transmission registration message.
8. the Ethernet device utilizing MAC Address according to claim 7, is characterized in that:
A described terminal is to described service list manager unicast transmission service provider requests message.
9. the Ethernet device utilizing MAC Address according to claim 6, is characterized in that:
Described other-end makes response when a described terminal broadcast transmits the described message as service provision request message to the described message of described terminal broadcast transmission, and is received and sent messages with a described terminal by described Ethernet according to MAC Address.
10. the Ethernet device utilizing MAC Address according to claim 9, is characterized in that:
The MAC Address of the service that a described terminal storage provides with the other-end that a described terminal is received and sent messages according to described MAC Address and described other-end, and the service provision request message unicast of the service provided about described other-end is transferred to described other-end.
11. 1 kinds of Ethernet methods utilizing MAC Address, is characterized in that, comprising:
When in multiple Ethernet switch at least any one starts or resets time terminal broadcast transmission Ethernet registration message step;
Judge that described multiple Ethernet switch or other-end are to the step of described registration message with or without response; And
Service list manager is judged, to determine service retrieval mode, and according to the step that the MAC Address of described other-end is received and sent messages by Ethernet according to the response results of described registration message.
The 12. Ethernet methods utilizing MAC Address according to claim 11, is characterized in that:
In the described step of being received and sent messages by Ethernet, when not having the response to described registration message, broadcast transmission services provides request message, and obtaining the MAC Address described service provision request message being made to the other-end of response, the MAC Address according to described other-end is received and sent messages.
The 13. Ethernet methods utilizing MAC Address according to claim 12, is characterized in that, also comprise:
Store the MAC Address of service that described other-end provides and described other-end, and the service provision request message unicast of the service provided about described other-end is transferred to the step of described other-end.
The 14. Ethernet methods utilizing MAC Address according to claim 11, is characterized in that:
In the described step of being received and sent messages by Ethernet, when the switch adjacent to a described terminal makes response to described registration message, switch adjacent to a described terminal is registered as described service list manager, and service provider requests's message unicast is transferred to described service list manager.
The 15. Ethernet methods utilizing MAC Address according to claim 11, is characterized in that:
In the described step of being received and sent messages by Ethernet, when any one in the non-conterminous switch in a described terminal and other-end makes response to described registration message, the switch or other-end of described registration message being made to response are registered as described service list manager, and service provider requests's message unicast is transferred to described service list manager.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130100320A KR102095563B1 (en) | 2013-08-23 | 2013-08-23 | Apparatus and method for ethernet network using mac address |
| KR10-2013-0100320 | 2013-08-23 |
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| Publication Number | Publication Date |
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| CN104426905A true CN104426905A (en) | 2015-03-18 |
| CN104426905B CN104426905B (en) | 2017-12-12 |
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| CN201410258124.XA Active CN104426905B (en) | 2013-08-23 | 2014-06-11 | Utilize the Ethernet device and its method of MAC Address |
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| CN (1) | CN104426905B (en) |
Cited By (1)
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| CN105072121A (en) * | 2015-08-17 | 2015-11-18 | 大唐移动通信设备有限公司 | Method and device for IMS terminal to self-organize network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20240044662A (en) | 2022-09-29 | 2024-04-05 | 주식회사 부현 | Smart terminal system capable of identifying location |
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| CN1714541A (en) * | 2002-11-22 | 2005-12-28 | 索尼株式会社 | Information processing device, server client system, method, and computer program |
| EP1841228A1 (en) * | 2005-01-19 | 2007-10-03 | Matsushita Electric Industrial Co., Ltd. | Broadcast reception device |
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Also Published As
| Publication number | Publication date |
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| KR102095563B1 (en) | 2020-03-31 |
| KR20150022440A (en) | 2015-03-04 |
| CN104426905B (en) | 2017-12-12 |
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