CN202095099U

CN202095099U - RFID self-organizing network system

Info

Publication number: CN202095099U
Application number: CN2011200085923U
Authority: CN
Inventors: 赵晴; 杨凯文; 汤熠
Original assignee: Beijing Liusuo Xinhuake Electronic Technique Co Ltd
Current assignee: Beijing Liusuo Xinhuake Electronic Technique Co Ltd
Priority date: 2011-01-10
Filing date: 2011-01-10
Publication date: 2011-12-28
Anticipated expiration: 2021-01-10

Abstract

The utility model relates to an RFID self-organizing network system. A main control reader-writer is connected with a PC host computer. A terminal reader-writer can send data to the main control reader-writer for storage after receiving tag data via a routing reader-writer in a multi-hop mode. Each RFID reader-writer forms a self-organizing sub-network with tags within the RFID reader-writer range. In some cases, the RFID reader-writer can set the tag into a forwarding mode, thus expanding the use distance of the tag, increasing the application flexibility of the RFID system, reducing the network organization difficulty and the engineering cost.

Description

A kind of RFID MANET system

Technical field

The present invention relates to field of radio frequency identification, especially relate to a kind of RFID MANET system.

Background technology

Radio-frequency (RF) identification (RFID, Radio Frequency Identification) is that a kind of wireless radio frequency mode of utilizing is carried out the noncontact transmitted in both directions between reader and transponder, with the technology of the purpose that reaches target identification and exchanges data.The complete rfid system of one cover partly is made up of read write line and label two, and its operating principle is given label for the unlimited electric wave energy of being launched a characteristic frequency by read write line, and the ID Code with inside sends in order to the driving tag circuit, and this moment, read write line just received this ID Code.Label special be to exempt from battery, exempt from contact, exempt to swipe the card thus be not afraid of dirty, and password to be that the world is unique can't duplicate safe, the long-life.The application of RFID is very extensive, and the typical case uses at present car alarm, gate inhibition's control, parking lot control, production line automation, handling of goods and materials.Electronic tag is the data medium of radio-frequency recognition system, and electronic tag is made up of label antenna and label special chip.According to the difference of electronic tag supply power mode, electronic tag can be divided into active electronic label (Active tag) and passive electronic label (Passive tag).Battery is housed in the active electronic label, and passive RF label does not have internal battery, will become active RFID system by the system that active electronic label is formed usually, and the system that passive electronic label is formed becomes passive RFID system.

Wireless self-organization network is by a large amount of nodes with communication and computing capability, the autonomous measurement and control network that connects and composes wirelessly.The network that normally extensive, wireless, self-organizing, multi-hop, no subregion, foundation-free facility are supported, wherein node is an isomorphism, and cost is lower, volume is less, and most of node does not move, arbitrarily be dispersed in the working region, require network system that the long as far as possible operating time is arranged.

Yet, in actual rfid system application project, usually do not consider the networking problem in the existed system at present, perhaps just separately consider the networking of rfid interrogator equipment and ignore networking problem between label and read write line, label and the label, thereby cause that difficulty of construction in the practical application is big, coverage hole is many, the work that the networking plan that lacks the label level also makes the label of networking originally to finish but can only be given read write line and be finished, thereby increases construction cost.Rfid interrogator all is fit to combine with present wireless self-organization network technology with the working method of label, corresponding different different MANET agreement and the networking modes of working mode selection, the application model of extended RFID and application are to the optimization of RFID technology with promote of great advantage.

Summary of the invention

The objective of the invention is to set up rfid system by the wireless self-networking technology, label, read write line are all joined in the network of self-organizing, read write line can pass through route read write line multi-hop transceive data, has increased the flexibility that read write line is settled, and has reduced difficulty of construction; Label also can be sent to read write line with label information by some labels that possesses forwarding capability simultaneously, has enlarged the overlay area of read write line, and good optimization application has been played in the special covering of blind area and the location of RFID.

According to the present invention, the wireless Ad Hoc master network of forming a multi-hop by all rfid interrogators, the master control read write line equipment that is connected with PC is the Centroid of whole network, other rfid interrogators are respectively route read write line or terminal read write line, the route read write line promptly is set to the rfid interrogator of route pattern, and the terminal read write line promptly is set to the rfid interrogator of general mode.Master control read write line equipment mainly is responsible for setting up multi-hop wireless self-organizing network, receives the label data that route read write line and terminal read write line are gathered, and sends dependent instruction etc., also possesses direct label data receiving function simultaneously; The route read write line is responsible for utilizing the label data that the terminal read write line receives multihop network to be sent to main control device and receiving the order of main controlled node transmission and be sent to the terminal read write line.The self-organizing subnet comprises 1 rfid interrogator equipment; Forwarding label promptly possesses the RFID label of forwarding capability; Common label does not promptly possess the RFID label of forwarding capability.The RFD read write line is responsible for setting up multi-hop wireless self-organizing network as the Centroid of subnet, receives the interior common label of its coverage and the data of forwarding label, and sends dependent instruction etc.; Forwarding label then can be transmitted to rfid interrogator as the subnet Centroid to other label datas of its reception; The common label data are sent to rfid interrogator as the subnet Centroid by its place self-organizing subnet.A self-organizing major network comprises N-1 self-organizing subnet (N is the read write line quantity that whole rfid system comprised) usually.

The invention provides a kind of RFID MANET system, described MANET system comprises the ad hoc network system of two levels, i.e. multi-hop wireless ad hoc major network of being made up of all rfid interrogators and the multi-hop wireless ad hoc subnet of being made up of the label in rfid interrogator and its scope.When not having data link between arbitrary rfid interrogator and the master control read write line, send networking request broadcasting by read write line; Receive networking request broadcasting by the master control read write line, and networking request broadcasting is verified, determine legal back receipt relevant information; According to the medium of the legal forward node of networking request broadcast reception,, select optimum route read write line to set up the data link by read write line visit may command MAC Address and received signal intensity level RSSI information.

Advantage of the present invention is at the read write line application characteristic different with label, has adopted different adhoc modes and data transfer mode, makes that read write line and label can flexible arrangement, conveniently monitoring.Be applied to fields such as personnel positioning and asset management, compare existing rfid system, native system has been expanded the application of label, read write line by the multi-hop network's mode, thereby has increased adaptability and the flexibility of whole rfid system, thereby reduce cost, promote positioning accuracy and system robustness.

Description of drawings

Fig. 1 is the RIFD MANET block diagram of system according to an exemplary embodiment of the present invention.

Fig. 2 is the multi-hop wireless ad hoc subnet schematic diagram of being made up of read write line and label according to an exemplary embodiment of the present invention.

Embodiment

As shown in Figure 1, this RFID MANET system comprises 1 main controlled node and several ordinary nodes.Wherein the master control read write line mainly is responsible for setting up the wireless Ad Hoc master network, the label data that terminal read write line or route read write line are gathered is sent to the master control read write line by the wireless Ad Hoc major network, and forward node can be transmitted label data from terminal node or other forward node to main controlled node; The read write line ad-hoc network comprises main controlled node, i.e. master control read write line equipment; And forward node, promptly be set to the read write line or the label of forward mode.Master control read write line equipment mainly is responsible for setting up network, receives the label data that forward node is gathered, and sends instruction etc., also possesses direct label data receiving function simultaneously; Forward node is responsible for utilizing label data multihop network to be sent to main control device and receiving the order of main controlled node transmission and be sent to reader.Label in each read write line and its sensing range is formed the wireless Ad Hoc subnet (as shown in Figure 2) of a multi-hop, each read write line is as the central apparatus storage and send all label informations in its subnet, forwarding label possesses the information forwarding capability, the information of terminal labels or other forwarding labels can be sent to central apparatus.

System work process is as follows: open all devices, the master control read write line will be responsible for setting up multihop network, and all rfid interrogators are successfully adding back transmission confirmation frame to the master control read write line; After terminal read write line or route read write line collect label data, these data will be sent to the master control read write line by wireless multi-hop network; The master control read write line sends acknowledgement information to the route read write line or the terminal read write line that send this label data, expression receives data route read write line or terminal read write line and does not receive that within a certain period of time acknowledgement information then can select to retransmit, do not receive after three times and think that then route lost efficacy, beginning route repair process.After major network is set up and is finished, each terminal read write line is responsible for setting up RFID self-organizing subnet, the networking work of its read write line and label may further comprise the steps: each rfid interrogator is as the Centroid of automatic network, be responsible for setting up the multi-hop ad hoc sub-network, the RFID label successfully adds back transmission confirmation to this rfid interrogator in the zone; Possess the RFID label of forwarding capability and the rfid interrogator binding of responsible networking, the rfid interrogator that its label data that receives is bound the forwarding value with it; Common label timed sending label data, and can before different sub-networks, switch.

According to above process, master control rfid interrogator equipment and route read write line and terminal read write line communication protocol:

The device data packet format is between PC and the master control rfid interrogator:

Table 1 data packet format structural table

Packet header	Command word	Data	CRC check	The bag tail
					2 bytes	1 byte	The N byte	2 bytes	2 bytes

(1) PC arrives the command transfer form of master control rfid interrogator:

Table 2 command format structural table

Command word	The parameter numbering	Destination address	Parameter values
				1 byte	1 byte	2 bytes	2 bytes

(2) the master control rfid interrogator is to the data transmission format of PC:

Table 3 data format structures table

Command word

Bag ID

Read head ID

Label ID

State

The network address

?RSSI

1 byte

2 bytes

1 byte

2 bytes

1 byte

The communications and data transmission means of whole system is followed the multihop self-organizing network agreement, and data format is: frame head+sub-network sign+data; Entire RF ID MANET system relates generally to five kinds of Frames: read write line information, automatic network information, label data, configuration data, receipt data.

Claims

1. RFID MANET system, it is characterized in that: described MANET system comprises the ad hoc network system of two levels, i.e. multi-hop wireless ad hoc major network of forming by all rfid interrogators and the multi-hop wireless ad hoc subnet of forming by the label in rfid interrogator and its scope, label and label, the wireless data transmission between label and the rfid interrogator adopts the frequency hopping communication modes.

2. RFID MANET according to claim 1 system, it is characterized in that: described multi-hop wireless ad hoc major network comprises master control read write line equipment, route read write line and terminal read write line, described route read write line is set to the rfid interrogator of route pattern, described terminal read write line is set to the rfid interrogator of general mode, wherein said master control read write line equipment is used to set up multi-hop wireless self-organizing network, receive the label data that route read write line and terminal read write line are gathered, and transmission dependent instruction, simultaneously also can directly receive label data, and described route read write line is used for utilizing multihop network to be sent to master control read write line equipment the label data that the terminal read write line receives and receiving the order of main controlled node transmission and this order is sent to the terminal read write line.

3. RFID MANET according to claim 1 system, it is characterized in that: described multi-hop wireless ad hoc subnet comprises 1 rfid interrogator equipment, forwarding label and common label, described forwarding label is the RFID label that possesses forwarding capability, described common label is not for possessing the RFID label of forwarding capability, wherein said rfid interrogator equipment is as the Centroid of subnet, be used to set up multi-hop wireless self-organizing network, receive the interior common label of its coverage and the data of forwarding label, and transmission dependent instruction, described forwarding label is transmitted to rfid interrogator equipment as the subnet Centroid with other label datas of its reception, and described common label data are sent to rfid interrogator as the subnet Centroid by its place multi-hop wireless ad hoc subnet with data.