CN104333888A - Self-organized instant messaging method based on Wi-Fi direct connection - Google Patents
Self-organized instant messaging method based on Wi-Fi direct connection Download PDFInfo
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- CN104333888A CN104333888A CN201410582597.5A CN201410582597A CN104333888A CN 104333888 A CN104333888 A CN 104333888A CN 201410582597 A CN201410582597 A CN 201410582597A CN 104333888 A CN104333888 A CN 104333888A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
- H04L51/58—Message adaptation for wireless communication
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Abstract
The invention discloses a self-organized instant messaging method based on Wi-Fi direct connection. The method includes the steps: 1) starting a Wi-Fi direct connection network by an intelligent mobile terminal, and searching and joining surrounding groups; searching surrounding intelligent terminals if the groups are not searched or the intelligent mobile terminal does not join the groups, and building a group; storing device information of group members to a device information table by a group leader with a P2P device, and broadcasting in the group; 2) periodically transmitting heartbeat packages containing state information of the group members to the group leader by the group members, updating states and timestamps of the corresponding group members by the group leader according to the received heartbeat packages, and feeding back confirming information; 3) selecting an IP (internet protocol) address of target members from the locally stored device information table, launching a connecting request, and messaging with the target member after successful connection when the group members or the group leader needs to message with the target members in the same group. Short-distance instant messaging between the intelligent terminals can be realized without accessing a cellular network base station or WLAN (wireless local area network) access point.
Description
Technical field
The present invention relates to one closely instant messaging (comprising voice, image or data etc.) method between intelligent mobile terminal, by closely forming self-organizing network, the method communicated can be carried out, belonging to the communications field.
Background technology
Instant messaging (IM, Instant Messaging), refers to that communication node carrys out pass-along message by network, and the mode of transmission of information has multiple, as file-sharing, audio frequency, video etc.There is multiple instant communication software in the market, as QQ, WhatsApp, micro-letter etc.On the one hand, these IM systems have enriched the life of people, bring great convenience to communication between domestic consumer.On the other hand, no matter be external WhatsApp or domestic QQ, micro-letter, they are faced with common problem and challenge, and namely these application all too rely on conventional internet, namely need connection cellular basestation or WLAN access point to network.When relate to other people (people that especially geographical position is closer) shared resource or communicate time, social activity such as between friend's share photos together, video, music or friend, game, interaction, people also need access network infrastructure, start IM software and carry out sharing or communicating again.This is very loaded down with trivial details and inconvenient, and expense is also very expensive sometimes.Add the application program that present people usually run tens access the Internets in the terminal, over-burden to cause cellular network flow, than classical speech services more consumption of natural resource.And this service not always can, people connect less than cellular basestation or WLAN access point sometimes, as music hall, factory building, tunnel, museum etc., these building structure may hinder the access of cellular basestation or WLAN access point, make them unavailable, especially under remote districts (covering as not having Cellular Networks) or emergency case, (as natural calamity) network cannot normally use.Also sometimes, people do not need to be connected to cellular basestation or WLAN access point, in some scenarios, just set up interim instant messaging, and may not re-use later.Therefore in this case, people intercommunication, connect swap data just become a urgent problem.
The problems referred to above can solve by using the Wi-Fi direct network of terminal intelligent operating system (as Android, apple iOS) to set up Ad hoc network between two or more intelligent mobile terminal.Ad Hoc network is a kind of mobile multi-hop distributed ad-hoc network, and it does not rely on fixing infrastructure, does not have center control nodes, has self-organization, can carry out flexible communication when not having conventional infrastructure support.Along with developing rapidly of wireless communication technology, add Wi-Fi direct function in intelligent terminal, equipment room can set up Ad Hoc network easily and flexibly.
To be a kind of traditional Wi-Fi802.11 client realize to point-to-point (P2P) of access point Wi-Fi direct, allows equipment to create mobile ad-hoc network, carry out high speed data transfer.Occur with Wi-Fi direct technology, people increase day by day to point to point wireless communication demand, such as multiplayer, resource-sharing, voice communication etc.For needing to transmit between users the application of data, this technology is very valuable beyond doubt.But even to this day, this technology is not popularized.Technically, because Wi-Fi direct is a kind of " pure software " technology, existing any Wi-Fi hardware can obtain Wi-Fi direct function by software upgrading.But not all Wi-Fi hardware supplier provides this upgrade service.Add Wi-Fi direct and just solve the problem how connected between equipment, do not have the support of the 3rd software to can not do whatever.
Summary of the invention
For the technical problem existed in prior art, the object of the present invention is to provide a kind of self-organizing instant communicating method based on Wi-Fi direct.The present invention, when not accessing cellular network base stations or WLAN access point, can realize the closely instant messaging (voice, image or data) between intelligent terminal.Especially severe network environment or there is no network infrastructure (Cellular Networks) condition under, people more need such communication pattern.
Technical scheme of the present invention is:
Based on a self-organizing instant communicating method for Wi-Fi direct, the steps include:
1) intelligent mobile terminal starts Wi-Fi direct network, the group that search group around selecting will add; If do not search group or fail to add the group searched, then send the intelligent terminal around probe requests thereby search and set up group with it; Described intelligent mobile terminal is the equipment with Wi-Fi or Wi-Fi direct function; The described group of some group members that there is a group leader and be connected with its radio communication, wherein group leader has P2P equipment, and group member is described intelligent mobile terminal; The facility information of group member is saved in a facility information table by group leader, and broadcast one comprises the message of this facility information table to group member in group;
2) group member regularly sends the heartbeat packet comprising oneself state information to group leader, and group leader upgrades state and the timestamp of corresponding group member in described facility information table according to this heartbeat packet received, and feeds back a confirmation to corresponding group member;
3), when group member or group leader need to communicate with the target members in group, connection request is initiated, the laggard Serial Communication of successful connection in the IP address choosing this target members from the facility information table that this locality is preserved.
Further, the method for building up of described group is: when initiate the described mobile intelligent terminal of probe requests thereby search around one or more described mobile intelligent terminal time, mutual switching equipment information between described mobile intelligent terminal; The mobile intelligent terminal then with P2P equipment negotiates a group leader by three-way handshake, wherein sends an intention value and an arbitration position in each handshaking information, chooses the group leader that intention value maximum is built group; When the intention value that two have the mobile intelligent terminal of P2P equipment is equal, determine the group leader of built group according to arbitration position.
Further, described intention value is an empirical value, and namely described mobile intelligent terminal serves as the number of times of group leader.
Further, described intention value is the hardware weighted value of described intelligent mobile terminal, described as hardware weighted value=dump energy × 50%+ residue RAM × 30%+ residue ROM × 20%.
Further, described intention value is the channel quality indicator CQI of described intelligent mobile terminal.
Further, described facility information comprises the device number of group member, IP address and resource parameters.
Further, when group member's setting-up time content does not receive the described confirmation of group leader's feedback, then send an Ask information to group leader, carry out procuratorial work group leader person whether in group; If also in group, then group leader sends confirmation immediately to this group member; If not in group, then again consult between group member to choose a group leader.
Further, when not receiving the described heartbeat packet of group member in group leader's setting-up time, then sending an Ask information to this group member, carrying out this group member of procuratorial work whether in group; If also in group, then this group member sends described heartbeat packet immediately to group leader; If not in group, then group leader is to the state of this group member of other group member's broadcast announcement information updating.
Further, when group member needs to exit group, this group member sends a leave group message to group leader, and group leader upgrades its facility information table and other group members in broadcast announcement group after receiving this leave group message, group member upgrades oneself facility information table after receiving this broadcast announcement; When group leader prepares to exit group, group leader broadcasts group leader's Transfer Message to group member, and group member holds consultation after receiving this group leader's Transfer Message and chooses a group leader.
Further, described intelligent mobile terminal comprises the port that is used for receiving and dispatching file message and control command, and one for the port of voice communication; Wherein, udp protocol is adopted to carry out voice communication:
First transmit leg creates a data under voice thread and and sends thread, then described voice collecting thread judges whether Boolean type data isRecord is true, if be true, then the speech data of collection is sent to stack and the buffering area of setting, closes voice collecting thread; Then described transmission thread judges whether isStartSend is true, if be true, then reads data from voice collecting thread stored in the buffering area of speech data, adopts udp protocol to be transferred to recipient, close and send thread;
First recipient creates a reception voice thread and and plays thread, then described reception voice thread judges whether Boolean function isReceive is true, if be true, then start to receive data by udp protocol and behind deposit data setting buffering area, close phonetic incepting thread; Then whether described broadcasting thread discriminant function isCall is true, if be true, then reads data from the buffering area of specifying, read complete after play from receiver, finish rear closedowns broadcasting thread.
Communication means of the present invention is under not accessing cellular network base stations or WLAN access point scene, realizes the instant messaging between Intelligent mobile equipment by Wi-Fi direct technology.It can find user in certain limit and connect, and realizes online real-time communication interchange and file-sharing between user.Here, the professional term can used in Wi-Fi direct network service is first introduced:
Subscriber equipment (UE): UserEquipment, meets the equipment of Wi-Fi or Wi-Fi direct function.
Group (Group): allow the one group of mobile device being shared the connection of Wi-Fi direct network by Wi-Fi interface.P2P group function class is similar to a basic BSS (Basic Service Set, infrastructure service set).
Group member (GC): the member of Group Client, P2P group, the equipment be connected with group leader's network in same group.
Group leader (GO): Group Owner, the P2P group owner, determines the SSID (Service Set Identifier, service set) of each P2P group, and selects the working channel of P2P group.The equipment only with Wi-Fi direct function just can serve as GO role.
P2P equipment: there is the equipment that Wi-Fi direct function serves as group membership in group.
Legacy equipment: there is wi-fi certified traditional Wi-Fi equipment, can only group member role be served as in group.
The present invention's design is divided into into four parts, namely organizes operation, nodal operation, transfer of data and voice communication.In the present invention, by the theory of soft AP, the major responsibility of further specification GO and effect.Can reduce the load of network like this, increasing network resource utilization, is one of main innovation of the present invention.In group operating process, the formation of GO primary responsibility group and dismission, group member's state in monitoring group, and broadcast group member's state variation at any time.In nodal operation process, the adding and leave of GO responsible node, and the transmission of group member's facility information.For this reason, technical operation Specification Design of the present invention is as follows:
A. operation is organized
Group operation comprises the dismission of the formation of group, the maintenance of group and group.In the present invention, the first stage to allow UEs form a group.Group forming process mainly to define in Wi-Fi direct specification relevant.In group maintenance process, the present invention devises a heartbeat mechanism to strengthen the contact between group membership.When running into some situation, group can be allowed to dismiss, details specifically provides described herein group of process of dismissing.
Group is formed: the forming process of group is described below: first user starts Wi-Fi direct by opening traditional Wi-Fi scanning, and Wi-Fi scanning can search for existing group.Wherein because the radio receiver that GO uses Intelligent mobile equipment OS to provide receives intent broadcast, the interested event of user can be responded.If what equipment did not search group maybe can not add existing group, so it starts to change between the two states.One is search condition, sends probe requests thereby and carries out searching for other nodes; Another kind is listening state, and equipment monitors the probe requests thereby that other nodes send.When UE receives a probe response, just can carry out GO negotiation with the other side, set up the secure communication using Wi-Fi protection setting.Finally, IP address configuration etc. is carried out by DHCP (Dynamic Host Configuration Protocol, DHCP) exchange.
But also have a problem to be exactly GO role negotiation in this process.Specify in specification: in order to determine which equipment becomes P2P GO, P2P equipment can send the digital parameters of a GO intention value in three-way handshake, and the equipment declaring maximum becomes P2P GO.When two equipment state identical GO intention value, in order to avoid a conflict, consult in request, to arrange an arbitration position at GO, when each GO consults to ask to send, in the middle of arbitration position is arranged at random.But in specification, how regulation does not define GO intention value, is that the manual operation of whom whom inviting serve as by realizes in real life.It is very inconvenient for doing like this, and probably causes multiple equipment to invite conflict, equipment connection failure.Propose following scheme in the present invention to define this GO intention value, realize the automatic operation that GO consults, lack human intervention like this, make connection procedure become more convenient.Scheme is as follows:
Scheme one: intention value equals empirical value.The number of times using filling apparatus to work as GO exactly defines GO intention value.Filling apparatus when GO number more, show that this equipment experience is higher, intention value is larger.If two equipment empirical values are equal, then decide intention value size by serving as the GO time recently.If two equipment all do not have experience, namely empirical value is zero, then two equipment respectively produce a random number and compare size.Random number is large, just directly serves as GO.
Scheme two: intention value equals hardware weighted value.Device hardware resource is used to define GO intention value exactly.As used weighted formula: hardware weighted value=dump energy × 50%+ remains RAM × 30%+ and remains ROM × 20%, also can adopt other weighted formula here.
Scheme three: intention value equals CQI (Channel Quality Indicator, CQI).CQI (CQI) is the measurement standard of the communication quality of wireless channel.CQI can be the so-called value (or multiple value) of channel measurement standard representing a given channel.Usually, the CQI of a high level represents that a channel has high quality, and vice versa.
Above three schemes cut both ways, and the first string is the simplest, and only need increase a count variable in existing code records GO number.But the first string is also the most inequitable scheme in three schemes.Because count has the greatest impact by extraneous factor, and can not change according to scene dynamics.First scheme is more complex, but maximumly can utilize device hardware resource.The filling apparatus making hardware-level high works as GO, is more conducive to the operation organized.And along with the change of hardware resource, GO also can dynamic change.All complicated than above of 3rd scheme is only that the value wanting to obtain CQI just needs comprehensive much external condition.But this scheme can utilize channel resource, realize data fast transport.
Group maintains: a group is wanted to continue to work efficiently, will note group member's situation of change the moment.Once exception appears in group membership, GO can deal with problems in time rapidly, and this just needs to keep consistency on messaging between GCs and GO.In group, UE is sometimes because various urgent emergency case leaves group, and other UEs not knowing, cause the delayed of message.When result causes other UEs to send data to this member, because cannot meet with a response and cause the wasting of resources.Design a heartbeat packet in the present invention, its Main Function declares group membership's state.GC periodically comprises the heartbeat packet of Activity message to prove oneself also in group to GO transmission, and GO feeds back GC OK message, and the facility information of updating the equipment in information list and timestamp.If after one-period, GO does not receive GC and sends Activity message, will send Ask information to this GC, carrys out this UE of procuratorial work whether in group.If GC is also in group, it can send Activity message immediately to GO; If GC is absent, GO is in time to other GCs broadcast announcement information.The effect of heartbeat packet not only can detect GCs state information in group, can also detect GO state in group.If GO is because abnormal condition leaves group, GCs also can be perceived by heartbeat packet fast.Because GC sends Activity information to GO, do not receive the confirmation OK message of GO feedback in one-period, equally can send an Ask message to GO yet.
Group is dismissed: in the present invention, group dismission situation is summarized as following several: 1) do not needed to communicate between UEs in group again, and notice is dismissed in GO broadcast, and group is normally dismissed.2) the interior UEs of group is less than in 2 or group does not have P2P equipment, and group is dismissed automatically.3) group occurs abnormal, whole group of paralysis or collapse cisco unity malfunction, and group is removed and is forced to dismiss.When the UE bearing GO role leaves group, group not necessarily can be dismissed, except not having Wi-Fi direct equipment in non-group.Group is not dismissed just needs the work of a GO maintenance group, and at this moment GO transfer will occur.When GO prepares to exit, GO Transfer Message can be broadcasted.After GCs receives message, carry out GO negotiation, select new GO.After new GO elects, new GO sends an acknowledge message to old GO.Old GO leaves group after receiving message.If GO leaves because of accident, GCs finds the absence of GO by heartbeat packet, then carries out GO and consult to select new GO.
B. nodal operation (UE)
In the present invention, UE can add at any time or leave.This is because UE has mobility, and UE is without the need to changing existing agreement, only needs some shirtsleeve operations just can realize.After group is formed, the connection of communication needs nodal operation.In this section, will describe in detail interior joint of the present invention operation add, creates connections, closedown connection and departure process.
1) add.UE has the process of existing group an of search in group forming process.If after searching, UE will send to the GO of group and join request, and adds the facility information of oneself in the request, comprises some device parameters, resource information etc.GO according to current network conditions, then determines whether allowing UE add in conjunction with the facility information of UE.Add once group leader refuses UE, UE searches for other node.UE successfully becomes in group after a member, and GO is stored into UE facility information in local data base, and broadcast notice messages, inform that other group member UE all successfully add this group.GO also can be broadcast to other group member UE facility information, and message comprises device number, IP address, resource parameters etc., and other member device information reproduction portions in group are issued UE.
2) connect.After UE becomes group member, enter listening state.If UE (source device) wants to communicate with specific certain user (target device), only need inquire about local device information list, search the device id of target device, the information such as IP address.Be send information according to IP address in the present invention, the benefit so done does not need increase to operate to use existing ICP/IP protocol, also can expand in IPV6 in the future and use.Search successfully, send connectivity request message to GO and wait for target response.GO is transmitted to targeted customer connection request, then is transmitted to UE, successful connection after the request receiving targeted customer's feedback is responded, otherwise failure.Owing to not supporting multicast in WLAN (wireless local area network), if user selects to communicate with multiple targeted customer, system will send multiple packet.
3) disconnect.UE can disconnect in both cases.One is under normal circumstances, DTD or do not need in the short time to carry out transfer of data, and UE sends to the equipment be connected with it and disconnects notification message.After equipment receives message, information list of updating the equipment, then sends an acknowledge message and responds UE notification message, connect and formally disconnect.Connect if rethought, can re invocation method of attachment.Under normal circumstances, UE's another kind of right and wrong quits work suddenly or fortuitous event occurs.The equipment be connected with UE can wait for a period of time until the timestamp time-out of a upper information, and equipment acquiescence connects disconnection, upgrades the facility information list of oneself.So what reason to cause the disconnection connected to, UE does not need to be concerned about, disregards yet.
4) leave.UE, because mobility, can leave a group at any time.When UE exits under normal circumstances, only need transmission leave group message to GO.After GO receipt message, information list of updating the equipment, then broadcast announcement is to other members of the group.After group member receives message, information list of updating the equipment, no longer sends any information to UE.UE is not once after broadcast leave group message, just receive group message, directly leave.When UE exits under abnormal condition, GO after one cycle, can discover the absence of this UE according to heartbeat mechanism.
C. transfer of data
In the present invention, the transmitting procedure of speech data is in fact a reciprocal process.The speech data that self is collected by microphone by equipment, is sent to target device from the network communication link established by socket.After target device receives speech data, played back by the receiver of self, next introduce data transmission procedure.
After receiver successful acquisition speech data on equipment, speech data is put into specific buffering area.Before transmission speech data, send a notice, allow receiving equipment carry out reception data encasement, after receiving the acknowledge message that recipient returns, use socket realizes the process of transmitting of speech data.Because wireless network environment is unstable, Transmission Control Protocol can increase the consumption of the network bandwidth.Add, people's ear can bear certain speech disturbance, allows the packet loss that voice communication is a small amount of.Udp protocol need not connect before a communication, sends, also do not ensure reliability directly to the other side, can fill perhaps for voice flow.And native system is mainly instant messaging, to the requirement of real-time speech communicating and the rate request of call not high.So the transfer of data in the present invention all adopts udp protocol to realize.Recipient, after receiving the transmission notice that transmit leg sends, carries out to receive and prepares, and what be ready to sends one to transmit leg and determine message afterwards.Recipient is placed in specific buffering area by udp protocol the speech data received, and just plays by receiver after speech data finishes receiving.
D. communication process
Carrying out in research process to Wi-Fi direct technology, developing related application to realize goal of the invention.The present invention develops in Android platform, can call the microphone of Android mobile terminal and receiver relevant interface to complete collection and the broadcasting of voice.Instantaneous communication system of the present invention requires the transmission can carrying out file and speech data, can distinguish these communication with two ports.A port is used for receiving and sends file message and control command, and another port is used for voice communication.Send in fileinfo process, find out corresponding IP address in lists according to the device id of recipient, utilize IP address and file identifier directly to generate UDP message bag and send and just can.If need to confirm, can tell that in content of text the other side replys.How many users are sent to just to select how many IP address to send.Voice communication will be more complex, owing to being the function realizing voice call Network Based, introduce voip technology at application.In existing real-time voice network communication field, VoIP, as a ripe solution, enumerates the technology such as voice compression coding, digital audio forwarding of packets, echo cancellor, application layer signaling control protocol, and is used widely.The general principle of VoIP carries out compressed encoding process by voice compression algorithm to speech data, then these speech datas are encapsulated by related protocols such as IP, voice message is transferred to through IP network and receives ground, again these voice messages are stringed together, after decoding decompression processing, revert to original voice signal, thus reach the object being transmitted voice by IP network.
Compared with prior art, good effect of the present invention is:
The present invention proposes a kind of effectively based on the instant communicating method of Wi-Fi direct.In group operating process, we are set as soft AP role GO, can reduce the load of network like this, increase network resource utilization.User as required, can communicate with neighbouring people whenever and wherever possible, can also carry out resource-sharing.And user is in communication process, due to without the need to using cellular basestation, so can not extra charge be produced.In the method, data also use WPA2 security mechanism, can ensure the information security of user.
Accompanying drawing explanation
Fig. 1 is based on communication process schematic diagram between Wi-Fi direct intelligent mobile terminal;
Fig. 2 is voice data transmission block schematic illustration
Fig. 3 is the network structure of communication system between the Ad hoc network intelligent terminal based on Wi-Fi direct.
Embodiment
Fig. 1 is based on communication process schematic diagram between Wi-Fi direct intelligent mobile terminal;
As shown in Figure 1, it is as follows that the method comprising the steps of:
Step S1.1:UE1 is Wi-Fi direct equipment, when UE1 wants to communicate with neighbouring mobile terminal, starts Wi-Fi direct network, node near search.After of short duration several seconds, search UE2 node, and form a group with it.Because this figure is communication process schematic diagram, so group forming process is omitted (detailed process figure can consult in group operation and organize forming section).Enter step S1.2;
Step S1.2:UE1 and UE2 is mutual switching equipment information in group forming process, and UE1 sends connection request according to intention to UE2, and enters step S1.3.
Step S1.3:UE2 determines whether response request in conjunction with network condition again according to equipment of itself resource.If accepted request, transmission connection response, enters step S1.4.Otherwise terminate this time communication.
After step S1.4:UE1 receives response, judge whether response is true.If be true, just connect with UE2, enter step S1.5.Otherwise terminate this time communication.
Step S1.5: after connection establishment, UE1 just can send file, voice or view data to UE2.Send file or view data, only need file or image to be packaged into UDP bag, sent by socket just passable.And speech data also needs through speech processes in UE1, be packaged into the Packet Generation of similar file after having processed again to UE2.UE2 receives this packet and seals off, then is reduced into speech data through speech processes, last audio plays.After being transmitted, enter step S1.6.
Step S1.6: intercommunication completes, performs end.
Fig. 2 is voice data transmission block schematic illustration
Transmit leg sends speech data can create two threads, and one is data under voice thread, and another sends thread.Some parameter informations used in figure are as follows:
IsRecord: judge the flag parameter whether speech data completes;
IsStartSend: judge whether speech data starts the flag parameter sent;
IsReceive: judge whether the flag parameter being ready to receive idea;
IsCall: the flag parameter judging whether initiating speech conversation;
Voice collecting thread work process is as follows: first system initialization voice collecting, does some corresponding preparations, is ready for sending stack and buffering area etc. needed for speech data, establishment voice collecting thread after preparation completes.Before collecting work starts, system can do a judgement, if Boolean type data isRecord is true, and will to the buffering area of specifying stored in the voice data collected from microphone.After data acquisition completes, close voice collecting thread.
Send thread work process as follows: before system sends speech data, first initialization thread, then judges whether isStartSend is true.If be true, just from voice collecting thread, read data stored in the buffering area of speech data.If isStartSend is false, system will terminate the transmission of this VoP automatically.After digital independent is complete, from the IP network established, be transferred to recipient by udp protocol.Be sent completely, close and send thread.
Above step is all work under respective independently Thread control, and the work between each thread is separate, but has certain correlation between it.
Recipient also can create two threads in reception voice process, is respectively and receives voice thread and play thread.
Receive the voice thread course of work as follows: the first initialization phonetic incepting of recipient, creates phonetic incepting thread.Then system judges whether Boolean function isReceive is true, if be that true illustrative system has carried out data receiver preparation, can start to receive data.If be false, system terminates this phonetic incepting automatically.Recipient receives speech data by udp protocol equally, and deposit data particular buffer.After data receiver completes, close phonetic incepting thread.
Speech play thread work process is as follows: system first initialization plays thread, and then whether discriminant function isCall is true.If be true, system reads data from the buffering area of specifying, and speech data only has and reads complete could broadcasting from receiver.If be false, system automatically terminates this and plays.After speech play completes, system closing plays thread.
Phonetic incepting said above, broadcasting etc. are all the activities of incoherence, although they have potential contact each other, have again respective independence, this independence needs to introduce multithreading in addition.Multithreading can allow this incoherence link up, and reaches the purpose of design of native system with this.
Fig. 3 is the network structure of communication system between intelligent mobile terminal in the Ad hoc network based on Wi-Fi direct;
Example according to Fig. 3, is described below in detail the flow process of carrying out data communication in same group between terminal.
(1): in figure, GO thinks and GC1 voice, GO will first set up voice with GC1 and will be connected.First, GO inquires about the facility information (note: in group, each member has oneself information list, this figure has marked the information list of GO and GC3 in order to easy) of GC1 in the facility information list of oneself.After finding, first look at the timestamp of G1, judge the state of G1, then send call request according to IP address.If do not found or G1 abnormal state, just can not communicate with it.GO will change another one destination call.
(2): after GC1 receives the call request of GO, select whether to agree to carry out voice call with GO according to own situation.If agree to just send close-talking response to GO; If do not agree to that just sending Refuse message refuses request.
(3): GO receives the close-talking response that GC1 sends, two end points are set up voice communication and are connected and carry out voice call immediately.Because be voice communication, so need to carry out speech processes at communicating pair respectively.To audio recording, compressed encoding and echo cancellor etc. before transmit leg sends voice data, finally voice data is packaged into UDP message bag, transfers out as file data transfer.Receive the reciever of voice data, first voice message is stringed together, after decoding decompression processing, be reduced into voice messaging.
(4): GC3 selects GO to carry out textcommunication, and first it sends file request to GO.And GO does not agree to communicate with GC3, GO sends Refuse message to GC1 and refuses its request.GC3, target diversion GC2, sends file request to GC2.GC2 receives GC1 request, returns a file response.Then establish a communications link between them and carry out file transfer.After being transmitted, disconnect, end operation.
(5): in above-mentioned situation, if GO agrees to communicate with GC3, so GO connects to the response of GC3 transmission file.Because GO now also keeps and the voice communication of GC1, so a new process can be started and GC3 carries out document communication.GO adopts the method for timeslice to respond GC1 and GC3 in turn.And different from GC3's according to GC1 device id, IP address, file identifier, both can not produce information and disturb.
(6): facility information list is that the interior each device storage of group is in the database of this locality.According to this table, equipment can know miscellaneous equipment situation, is conducive to equipment and communicates.
Claims (10)
1., based on a self-organizing instant communicating method for Wi-Fi direct, the steps include:
1) intelligent mobile terminal starts Wi-Fi direct network, the group that search group around selecting will add; If do not search group or fail to add the group searched, then send the intelligent terminal around probe requests thereby search and set up group with it; Described intelligent mobile terminal is the equipment with Wi-Fi or Wi-Fi direct function; The described group of some group members that there is a group leader and be connected with its radio communication, wherein group leader has P2P equipment, and group member is described intelligent mobile terminal; The facility information of group member is saved in a facility information table by group leader, and broadcast one comprises the message of this facility information table to group member in group;
2) group member regularly sends the heartbeat packet comprising oneself state information to group leader, and group leader upgrades state and the timestamp of corresponding group member in described facility information table according to this heartbeat packet received, and feeds back a confirmation to corresponding group member;
3), when group member or group leader need to communicate with the target members in group, connection request is initiated, the laggard Serial Communication of successful connection in the IP address choosing this target members from the facility information table that this locality is preserved.
2. the method for claim 1, it is characterized in that the method for building up of described group is: when initiate the described mobile intelligent terminal of probe requests thereby search around one or more described mobile intelligent terminal time, mutual switching equipment information between described mobile intelligent terminal; The mobile intelligent terminal then with P2P equipment negotiates a group leader by three-way handshake, wherein sends an intention value and an arbitration position in each handshaking information, chooses the group leader that intention value maximum is built group; When the intention value that two have the mobile intelligent terminal of P2P equipment is equal, determine the group leader of built group according to arbitration position.
3. method as claimed in claim 2, it is characterized in that described intention value is an empirical value, namely described mobile intelligent terminal serves as the number of times of group leader.
4. method as claimed in claim 2, is characterized in that described intention value is the hardware weighted value of described intelligent mobile terminal, described hardware weighted value=electricity × 50%+RAM × 30%+ROM × 20%.
5. method as claimed in claim 2, is characterized in that described intention value is the channel quality indicator CQI of described intelligent mobile terminal.
6. method as claimed in claim 1 or 2, is characterized in that described facility information comprises the device number of group member, IP address and resource parameters.
7. the method for claim 1, is characterized in that when group member's setting-up time content does not receive the described confirmation of group leader's feedback, then sending an Ask information to group leader, carrying out procuratorial work group leader person whether in group; If also in group, then group leader sends confirmation immediately to this group member; If not in group, then again consult between group member to choose a group leader.
8. the method for claim 1, is characterized in that when not receiving the described heartbeat packet of group member in group leader's setting-up time, then sending an Ask information to this group member, carrys out this group member of procuratorial work whether in group; If also in group, then this group member sends described heartbeat packet immediately to group leader; If not in group, then group leader is to the state of this group member of other group member's broadcast announcement information updating.
9. the method for claim 1, it is characterized in that when group member needs to exit group, this group member sends a leave group message to group leader, group leader upgrades its facility information table and other group members in broadcast announcement group after receiving this leave group message, group member upgrades oneself facility information table after receiving this broadcast announcement; When group leader prepares to exit group, group leader broadcasts group leader's Transfer Message to group member, and group member holds consultation after receiving this group leader's Transfer Message and chooses a group leader.
10. the method for claim 1, is characterized in that described intelligent mobile terminal comprises the port that is used for receiving and dispatching file message and control command, and one for the port of voice communication; Wherein, udp protocol is adopted to carry out voice communication:
First transmit leg creates a data under voice thread and and sends thread, then described voice collecting thread judges whether Boolean type data isRecord is true, if be true, then the speech data of collection is sent to stack and the buffering area of setting, closes voice collecting thread; Then described transmission thread judges whether isStartSend is true, if be true, then reads data from voice collecting thread stored in the buffering area of speech data, adopts udp protocol to be transferred to recipient, close and send thread;
First recipient creates a reception voice thread and and plays thread, then described reception voice thread judges whether Boolean function isReceive is true, if be true, then start to receive data by udp protocol and behind deposit data setting buffering area, close phonetic incepting thread; Then whether described broadcasting thread discriminant function isCall is true, if be true, then reads data from the buffering area of specifying, read complete after play from receiver, finish rear closedowns broadcasting thread;
Wherein, isRecord is the flag parameter judging whether speech data completes; IsRecord is the flag parameter judging whether speech data completes; IsReceive is the flag parameter judging whether to be ready to receive idea; IsCall is the flag parameter judging whether initiating speech conversation.
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