CN106453595B - Communication system under foundation-free facility mobile environment centered on content - Google Patents

Communication system under foundation-free facility mobile environment centered on content Download PDF

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Publication number
CN106453595B
CN106453595B CN201610947033.6A CN201610947033A CN106453595B CN 106453595 B CN106453595 B CN 106453595B CN 201610947033 A CN201610947033 A CN 201610947033A CN 106453595 B CN106453595 B CN 106453595B
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node
packet
user
content
communication system
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CN106453595A (en
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丁良辉
钱良
朱梅虹
杨峰
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H04L67/63—Routing a service request depending on the request content or context
    • 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
    • H04L45/32—Flooding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric
    • H04L49/252—Store and forward routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

Abstract

The present invention relates to a kind of communication systems under foundation-free facility mobile environment centered on content, include: mobile terminal, has the function of that voice, video, the APP software for sending picture can be provided, while using NDN framework, three kinds of data packets are defined, PIT table and caching CS are set；And flooding using the forwarding strategy control data bag of optimization, reduce the response time of request；MSP430 single-chip microcontroller using the channel competition mode of traditional CSMA/CA, and devises frame structure for realizing the mac-layer protocol part of overall communication system；Bluetooth module completes data from mobile phone terminal to the transmission of MSP430 single-chip microcontroller for connecting mobile phone terminal embedded with bluetooth；Lora module completes the narrow band data transmission of different distance different power consumption.Compared with prior art, the present invention uses future network media framework NDN, is truly realized NDN in such a way that content replaces IP address communication, is more suitable for the sharing of multimedia content in network.

Description

Communication system under foundation-free facility mobile environment centered on content
Technical field
The present invention relates to wireless communication technology fields, more particularly, to one kind with content under foundation-free facility mobile environment Centered on communication system.
Background technique
With the development of wireless network and the universalness of mobile device, demand of the people to information exchange is also gradually promoted. Nowadays, the basic standard of end-to-end communication is no longer only satisfied in requirement of the people to wireless telecommunications.Microblogging sharing, wechat The rise of the emerging networks media industry such as circle of friends, so that more people it is expected under wireless network environment, it also can be right in real time Content is shared.However under the conditions of radio resource, due to narrower bandwidth, communication link is unstable, Network Mobility performance compared with The problems such as poor, causes the transmission for multimedia content, cannot as in cable network fast and stable.Therefore, how to be promoted The performance of wireless network ensures the telecommunication service quality for the purpose of content share, becomes new discuss words warmly in recent years Topic.
The design bottleneck of IP network framework makes people begin to focus on the exploitation to the new network architecture, also exactly in this way In the case where, name data network (Named Data Networking, abbreviation NDN) this novel network architecture is gradually walked The sight of people is entered.NDN be using for data it is direct name it is matched with content to make requests, each NDN's All containing the data label being defined for data content in data packet.When the arbitrary node in network receives the data packet When, it all can be according to the operations such as receiving interface record, forwarding interface record be carried out for the label of content, then by specific Data packet is forwarded by routing forwarding agreement.If, should by chance containing the data packet for meeting interest content in the node Data packet can record according to the interface recorded in node data packet inversely returning to user.
The application of NDN in the wireless network is mainly segmented into two kinds: (1) being arranged in the existing network architecture NDNoverlay, this method still do not get rid of existing IP network framework, and NDN cannot be made full use of to seek with content substitution IP The characteristics of location；(2) NDN layers are directly designed on the mac layer, and this mode is generally used for the ad such as sensor network, car networking Then hoc network does not make the modification for being adapted to NDN network characteristics to MAC layer.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind in foundation-free facility Communication system under mobile environment centered on content provides the application in the foundation-frees communications facility such as exploration, navigation, tourism The function of telecommunication in scene, while future network media framework NDN is used, it is truly realized NDN and is replaced with content The mode of IP address communication, is more suitable for the sharing of multimedia content in network.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of communication system under foundation-free facility mobile environment centered on content, comprising:
Mobile terminal has the function of that voice, video, the APP software for sending picture can be provided, while using NDN framework, fixed PIT table and caching CS is arranged in adopted three kinds of data packets；And flooding using the forwarding strategy control data bag of optimization, reduction is asked The response time asked；
MSP430 single-chip microcontroller, for realizing the mac-layer protocol part of overall communication system, using traditional CSMA/CA Channel competition mode, and devise frame structure with meet quickly networking logout, send SOS signal function；
Bluetooth module completes data from mobile phone terminal to the transmission of MSP430 single-chip microcontroller for connecting mobile phone terminal embedded with bluetooth；
It is different to complete different distance by customized physical layer protocol and two different modulating modes for Lora module The narrow band data of power consumption transmits.
The data packet of the mobile terminal includes three types, is respectively as follows:
(1) interest packet Interest Packet can generate one accordingly when a user requests a content Interest packet, the interest packet include the title of its request content, and broadcast the interest packet to surrounding user；
(2) data packet returns to corresponding data packet after Content owner receives interest packet；
(3) topology maintenance packet: each periodic maintenance of neighbor user information of user, including GPS information, neighbor user letter Breath and PIT table information.
The cache policy of the caching CS is divided into two parts: (1) whether caching the data packet received；(2) work as caching After space is filled with, using the cache policy of LCE-LFU, that is, caches all data packets received and replaced if spatial cache has been expired The content that least frequently uses of generation, while the arrival rate of interest packet and data packet is considered to indicate the request frequency of different content Rate.
The PIT table, which is used to record, to be received user and receives but the information of unappeasable interest packet, it is contemplated that in nothing Under thread environment, user has mobility, receives and requests the transmission user of the content that may have been moved off reception originally around user The transmission range of user, therefore, every in PIT table be recorded in setting time after will be considered out-of-date and be deleted.
The flooding for forwarding strategy control data bag specifically includes:
(1) the selection optimization problem for the next-hop forwarding interest packet node for jumping neighborhood information based on one:
WhereinIndicate the neighbor node set without processing same request,Indicate the neighbour of processed same request Node set is occupied,Indicate the area coverage of node i,Indicate the set for the next-hop forward node chosen,It is's Subset；ρ ∈ (0,1] it is the quantity that preset threshold value is used to control interest packet； Expression is chosen Forward node and the range union of forwarded over coverage；Above-mentioned formula expression is meant in untreated same request Least forward node is chosen in neighbor node set covers maximum range；Selected node continues to forward interest packet, not Selected node does not forward interest packet then；
(2) the selection optimization problem of the next-hop forwarding interest packet node based on double bounce neighborhood information:
WhereinIndicate the neighbor node set without processing same request,Indicate the neighbour of processed same request Node set is occupied,Indicate the neighbors set of node i,Indicate the set for the next-hop forward node chosen,It is Subset；ρ ∈ (0,1] it is the quantity that preset threshold value is used to control interest packet； Indicate choosing In forward node and the union of the node set of forwarded over coverage；Above-mentioned formula expression is meant in untreated phase The neighbor node of least forward node cover-most is chosen in neighbor node set with request.
The frame structure of the MSP430 single-chip microcontroller is made of two parts: MAC header and MAC carrying, MAC header is by a fixation Byte composition, including MAC information type, reservation and version number, be arranged different MAC information types can quickly networking, move back Net sends SOS signal；
MAC carrying is made of frame head and load, network ID of the frame head by four bytes, the destination address ID of a byte, The forwarding address ID of one byte, the source address ID of address and the control information composition of a byte；
Network ID: being determined when networking by the MAC Address of each user, uniquely indicates a network；
Destination address ID: being consulted to decide when networking by each user, represents unique mark of user in network, and 0xFF retains For broadcast；
Forwarding address ID: for showing that multi-hop needs the node that forwards；
Source address ID: the User ID of information is sent.
The bluetooth module position bluetooth 4.0, since the size of the primary transmissible packet of bluetooth 4.0 is 20bytes, and Once manageable data package size is 54bytes to MSP430 single-chip microcontroller, is defined for mobile terminal and MSP430 single-chip microcontroller Between interface protocol to realize the segmentation and recombination of packet.
Compared with prior art, the present invention, which makes full use of, broadcasts this characteristic in wireless network, devise quick group of support Net sends SOS message and supports the mac-layer protocol of unicast broadcast, and directly devises NDN layers on this basis, sufficiently examines The slightly mobility of wireless network proposes the optimization problem to forwarding strategy to solve broadcast bring flooding problem, while right Cache policy modifies, while considering the arrival rate of data packet and interest packet；It is primary transmissible additionally, due to bluetooth 4.0 The size of packet is 20bytes, and once manageable data package size is 54bytes to MSP430, we define for APP Interface protocol between MSP430 is to realize the segmentation and recombination of packet.
Detailed description of the invention
Fig. 1 is communication system frame diagram of the present invention；
Fig. 2 is the frame structure schematic diagram of MSP430；
Fig. 3 is the structural schematic diagram of transparent data packet；
Fig. 4 is the structural schematic diagram of non-transparent transmission order.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiment is a part of the embodiments of the present invention, rather than whole embodiments.Based on this hair Embodiment in bright, those of ordinary skill in the art's every other reality obtained without making creative work Example is applied, all should belong to the scope of protection of the invention.
As shown in Figure 1, a kind of communication system under foundation-free facility mobile environment centered on content, comprising:
Mobile terminal: design is a to provide voice, video, the APP for sending the multiple functions such as picture.NDN frame is used simultaneously Structure defines two kinds of data packets: interest packet and data packet, and PIT table and caching CS is arranged.Simultaneously using the forwarding strategy control of optimization Flooding for two kinds of data packets is made, the response time of request is reduced.
Bluetooth 4.0: since mobile phone can not directly be connected with MSP430, using bluetooth 4.0 between mobile phone terminal and MSP430 Transmit data.Mobile phone terminal, which calls corresponding module to open bluetooth in APP and searches for periphery, can match bluetooth equipment, and selection is accordingly set Data can be carried out after standby pairing to send and receive.Since the size of the primary transmissible packet of bluetooth 4.0 is 20bytes, and Once manageable data package size is 54bytes to MSP430, we define for the interface association between APP and MSP430 Discuss the segmentation and recombination to realize packet.
MSP430: the mac-layer protocol part of overall communication system is realized.Using the channel competition of traditional CSMA/CA Mode, and frame structure is devised to meet quickly networking logout, send the functions such as SOS signal.
Lora module: using SX1276 chip, and SX1276/77/78 transceiver mainly uses the long-range modulatedemodulate of " Lora " ^TM Device is adjusted, extra long distance spread spectrum communication is used for, strong interference immunity can reduce current drain to greatest extent.
Mobile terminal APP is in addition to providing voice, video, sending the functions such as picture, it is most important that in our communication system In realize NDN layers, including the following aspects:
Type of data packet a: data packet for co-existing in three types in whole network: (1) interest packet Interest Packet can generate a corresponding interest packet, include its request content when a user requests a content Title, and the interest packet is broadcasted to surrounding user；(2) data packet returns corresponding after Content owner receives interest packet Data packet；(3) topology maintenance packet: the information of each periodic maintenance of neighbor user of user includes GPS information, neighbor user letter Breath and PIT table information etc..
Content caching CS: cache policy is divided into two parts: (1) whether caching the data packet received；(2) work as spatial cache After being filled with, the content cached how is substituted.In the present system, we use the cache policy of LCE-LFU, that is, cache all receipts The data packet arrived substitutes the content least frequently used if spatial cache has been expired, while considering interest packet and data packet Arrival rate indicates the request frequency of different content
Do not meet interest PIT table: PIT table is to receive user for recording and receive but the letter of unappeasable interest packet Breath, it is contemplated that in the wireless context, user has mobility, receives and requests the transmission user of the content may around user originally Have been moved off the transmission range for receiving user, therefore, every in PIT table record will be considered after a certain time it is out-of-date simultaneously It is deleted.
Forwarding strategy FIB: in the present system, all users send Various types of data packet using broadcast mode, if be not added With control, serious data packet flooding problem can be brought, while generating network congestion, waste bandwidth, in order to which as fast as possible is expired Sufficient interest packet and flooding for data packet is reduced, the optimization problem for needing to solve we have proposed two:
(1) the selection optimization problem for the next-hop forwarding interest packet node for jumping neighborhood information based on one:
WhereinIndicate the neighbor node set without processing same request,Indicate the neighbour of processed same request Node set is occupied,Indicate the area coverage of node i,Indicate the set for the next-hop forward node chosen,It is's Subset.ρ ∈ (0,1] it is the quantity that preset threshold value is used to control interest packet. Expression is chosen Forward node and the range union of forwarded over coverage.The main thought of the algorithm is in untreated same request Least forward node is chosen in neighbor node set covers maximum range；Selected node continues to forward interest packet, not Selected node does not forward interest packet then；
(2) the selection optimization problem of the next-hop forwarding interest packet node based on double bounce neighborhood information:
WhereinIndicate the neighbor node set without processing same request,Indicate the neighbour of processed same request Node set is occupied,Indicate the neighbors set of node i,Indicate the set for the next-hop forward node chosen,It is Subset.ρ ∈ (0,1] it is the quantity that preset threshold value is used to control interest packet. Indicate choosing In forward node and the union of the node set of forwarded over coverage.The main thought of the algorithm is in untreated phase The neighbor node of least forward node cover-most is chosen in neighbor node set with request.
MSP430: the mac-layer protocol part of overall communication system is realized.Using the channel competition of traditional CSMA/CA Mode, and frame structure is devised to meet quickly networking logout, send the functions such as SOS signal.Specific frame structure design is such as Shown in Fig. 2:
MAC layer frame structure is made of two parts: MAC header and MAC carrying.MAC header is made of a fixed byte, including MAC information type, reservation and version number.Different MAC information types is arranged can quick networking, logout, transmission SOS signal Deng.MAC carrying is made of frame head and load.Network ID of the frame head by four bytes, the destination address ID of a byte, a word The forwarding address ID of section, the source address ID of address and the control information composition of a byte.Network ID: by each when networking The MAC Address of user determines, uniquely indicates a network；Destination address ID: it is consulted to decide when networking by each user, represents net Unique mark of user, 0xFF are left broadcast in network；Forwarding address ID: for showing that multi-hop needs the node that forwards；Source Location ID: the User ID of information is sent.
Interface protocol: since the size of the primary transmissible packet of bluetooth 4.0 is 20bytes, and MSP430 can once locate The data package size of reason is 54bytes, we define the segmentation that packet is realized for the interface protocol between APP and MSP430 With recombination.
For transparent data packet, as shown in Figure 3: 60 byte in total, wherein payload length is 54 bytes.One entire packet Possess a sequence number, to indicate the sequence entirely wrapped, to retransmit or confirm.Packet number in each control head is used To recombinate load.When payload is less than 54 byte, still need to gather the packet of full three 20 bytes, therefore, it is necessary to will be less than 54 The payload of byte mends 0 composition, 54 byte behind and carries out package.
For non-transparent transmission order, as shown in Figure 4: each whole packet is split as unit of 20 bytes.Control head and sequence It is identical in row number and transparent transmission order.The quantity for splitting packet is determined according to order length.When the last one 20 byte packet is less than 20 words When section, 0 is mended behind Crc verification code check.By order, mobile phone terminal and MSP430 can be exchanged with each other networking, hardware device Information, into the information such as suspend mode and modulating mode.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right It is required that protection scope subject to.

Claims (7)

1. a kind of communication system under foundation-free facility mobile environment centered on content characterized by comprising
Mobile terminal has the function of that voice, video, the APP software for sending picture can be provided, while using NDN framework, defines three PIT table and caching CS is arranged in kind data packet；And flooding using the forwarding strategy control data bag of optimization, reduce request Response time；
MSP430 single-chip microcontroller, for realizing the mac-layer protocol part of overall communication system, using the letter of traditional CSMA/CA Road competitive mode, and the function of devising frame structure to meet quickly networking logout, send SOS signal；
Bluetooth module completes data from mobile phone terminal to the transmission of MSP430 single-chip microcontroller for connecting mobile phone terminal embedded with bluetooth；
Lora module completes different distance different power consumption by customized physical layer protocol and two different modulating modes Narrow band data transmission.
2. a kind of communication system under foundation-free facility mobile environment centered on content according to claim 1, It is characterized in that, the data packet of the mobile terminal includes three types, is respectively as follows:
(1) interest packet Interest Packet can generate a corresponding interest when a user requests a content Packet, the interest packet include the title of its request content, and broadcast the interest packet to surrounding user；
(2) data packet returns to corresponding data packet after Content owner receives interest packet；
(3) topology maintenance packet: each periodic maintenance of neighbor user information of user, including GPS information, neighbor user information with And PIT table information.
3. a kind of communication system under foundation-free facility mobile environment centered on content according to claim 1, It is characterized in that, the cache policy of the caching CS is divided into two parts: (1) whether caching the data packet received；(2) work as caching After space is filled with, using the cache policy of LCE-LFU, that is, caches all data packets received and replaced if spatial cache has been expired The content that least frequently uses of generation, while the arrival rate of interest packet and data packet is considered to indicate the request frequency of different content Rate.
4. a kind of communication system under foundation-free facility mobile environment centered on content according to claim 1, It is characterized in that, the PIT table, which is used to record, to be received user and receive but the information of unappeasable interest packet, it is contemplated that in nothing Under thread environment, user has mobility, receives and requests the transmission user of the content that may have been moved off reception originally around user The transmission range of user, therefore, every in PIT table be recorded in setting time after will be considered out-of-date and be deleted.
5. a kind of communication system under foundation-free facility mobile environment centered on content according to claim 1, It is characterized in that, the flooding for forwarding strategy control data bag specifically includes:
(1) the selection optimization problem for the next-hop forwarding interest packet node for jumping neighborhood information based on one:
WhereinIndicate the neighbor node set without processing same request,Indicate neighbours' section of processed same request Point set,Indicate the area coverage of node i,Indicate the set for the next-hop forward node chosen,It isSon Collection；ρ ∈ (0,1] it is the quantity that preset threshold value is used to control interest packet； What expression was chosen The range union of forward node and forwarded over coverage；Above-mentioned formula expression means the neighbour in untreated same request It occupies and chooses the maximum range of least forward node covering in node set；Selected node continue forward interest packet, not by The node chosen does not forward interest packet then；
(2) the selection optimization problem of the next-hop forwarding interest packet node based on double bounce neighborhood information:
WhereinIndicate the neighbor node set without processing same request,Indicate neighbours' section of processed same request Point set,Indicate the neighbors set of node i,Indicate the set for the next-hop forward node chosen,It isSon Collection；ρ ∈ (0,1] it is the quantity that preset threshold value is used to control interest packet；What expression was chosen Forward node and the union of the node set of forwarded over coverage；Above-mentioned formula expression is meant identical asks untreated The neighbor node of least forward node cover-most is chosen in the neighbor node set asked.
6. a kind of communication system under foundation-free facility mobile environment centered on content according to claim 1, Be characterized in that, the frame structure of the MSP430 single-chip microcontroller is made of two parts: MAC header and MAC carrying, MAC header are solid by one Determine byte composition, including MAC information type, reservation and version number, be arranged different MAC information types can quickly networking, Logout sends SOS signal；
MAC carrying is made of frame head and load, network ID of the frame head by four bytes, the destination address ID of byte, and one The forwarding address ID of byte, the source address ID of address and the control information composition of a byte；
Network ID: being determined when networking by the MAC Address of each user, uniquely indicates a network；
Destination address ID: being consulted to decide when networking by each user, represents unique mark of user in network, and 0xFF is left wide It broadcasts；
Forwarding address ID: for showing that multi-hop needs the node that forwards；
Source address ID: the User ID of information is sent.
7. a kind of communication system under foundation-free facility mobile environment centered on content according to claim 1, It being characterized in that, the bluetooth module is bluetooth 4.0, since the size of the primary transmissible packet of bluetooth 4.0 is 20bytes, and Once manageable data package size is 54bytes to MSP430 single-chip microcontroller, is defined for mobile terminal and MSP430 single-chip microcontroller Between interface protocol to realize the segmentation and recombination of packet.
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