CN103533056B - A kind of P2P mobile stream media system towards smart mobile phone and method of work thereof - Google Patents
A kind of P2P mobile stream media system towards smart mobile phone and method of work thereof Download PDFInfo
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Abstract
The invention discloses a kind of P2P mobile stream media system towards smart mobile phone and method of work thereof.This system includes that several have the smart mobile phone of Wi Fi network interface card and 3G module as communication node, is built with P2P overlay network manager, data task manager, 3G download manager, streaming media server, adaptive cache manager on each mobile phone.Method of work is when carrying out streaming media playing, first smart mobile phone node asks respective data blocks to other node in local P2P overlay network, if and only if time this locality cannot find relevant data block, by 3G network to remote server request data, thus realizes the broadcasting of Streaming Media.This system supports that carrying out streaming media resource by WiFi network between smart mobile phone under mobile network environment shares.By means of the invention it is also possible to be effectively reduced mobile flow medium user to the bandwidth of 3G network and network traffic demand.
Description
Technical field
The present invention relates to mobile P 2 P Stream Media Application field, a kind of P2P towards smart mobile phone moves
Stream media system and method for work thereof.
Background technology
Along with the fast development of development of Mobile Internet technology, people's handset processes used in everyday ability and communication requirement
Also gradually increasing, mobile flow medium is becoming the next growth point of mobile Internet.Intelligence hands at present
The base station access module that owner's mobile operator to be passed through network is provided, uses 3G network to carry out Streaming Media number
According to transmission.It practice, main flow smart mobile phone is respectively provided with Wi-Fi network interface card hardware, and support that Ad-Hoc pattern is entered
Row point-to-point communication, can carry out stream medium data by local point-to-point communication between the most multiple mobile phones and share, but
It is to have not yet to see the report about this respect.
Summary of the invention
The technical problem to be solved is to provide a kind of P2P network system set up between smart mobile phone
System, the stream medium data between this system support node is shared, be ensure that each mobile phone in same network simultaneously
Node has the least network traffics.Additionally, the present invention also provides for the method for work of this system.
A kind of mobile P 2 P stream media system towards smart mobile phone of the present invention, its feature includes several
There is the smart mobile phone of Wi-Fi network interface card and 3G module as communication node, each mobile phone be built with:
P2P overlay network manager: for forming P2P overlay network between smart mobile phone to carry out abstract data
Transmission, and data resource positioning function is provided so that the smart mobile phone of each addition P2P overlay network can pass through
One globally unique mark searches corresponding data in other mobile phone；
Data task manager: use state machine model that the unification of each data task vital stage is managed, and
Other module in notice system when data task state changes, thus realize packet loss functions of retransmission；
3G download manager: when finding related data in local P2P overlay network, smart mobile phone leads to
Cross 3G network and ask corresponding data to remote server, thus ensure the lasting broadcasting of Streaming Media；
Streaming media server: the media player installed on smart mobile phone is to building at local streaming media server
Request data, media request is converted to request of data by streaming media server, thus realize media player can
And the data exchange between bottom；
After these smart mobile phones start and run all above manager, i.e. one mobile P 2 P Streaming Media of composition
System, can carry out data exchange by local Wi-Fi network between each smart mobile phone, and download this from 3G network
The data block that ground lacks.
As improvement, should also include that adaptive cache managed towards the mobile P 2 P stream media system of smart mobile phone
Device: carry out the adaptive cache in multi-hop data transmission in P2P overlay network bottom layer realization.
Additionally, present invention also offers the method for work of the described mobile P 2 P stream media system towards smart mobile phone,
It comprises the following steps:
1) when certain smart mobile phone communication node carries out streaming media playing, this smart mobile phone communication node is first
Asked by P2P overlay network other smart mobile phone communication node broadcast data peritropous
BITMAP_REQUEST, comprises the globally unique identifier of this data block in request of data；
2) other smart mobile phone communication node is receiving the request of data that step 1) interior joint is broadcasted
After BITMAP_REQUEST, the ability of offer data, services external to local node is estimated, and assesses content
Including: whether local cache contain corresponding data block, and whether local hardware resources state and network condition
Can be that other node provides service；After the smart mobile phone communication node being really recognized as the request that sends provides service,
This requested smart mobile phone communication node will send back multiple BITMAP_REPLY to the former, forward step 3) to；As
The most all requested smart mobile phone communication nodes all do not send reply BITMAP_REPLY, then forward step 6) to；
3) the smart mobile phone communication node sending request will say that the reply received carries out record, form this locality
Neighboring node list, and pick out comprehensive according to network delay, average communication band merit in neighboring node list
Close the requested smart mobile phone communication node that performance is higher, and be sent to data sending request
DATA_REQUEST；
4) the requested smart mobile phone communication node in step 3) is after receiving data sending request, as sending
The smart mobile phone communication node of data sends respective data blocks to the smart mobile phone communication node sending request
DATA_REPLY；
5) send after the smart mobile phone communication node of request receives respective data blocks DATA_REPLY, this number of times
According to the end of transmission；
6) system is connected to remote media clothes by the 3G network that the smart mobile phone communication node sending request is built-in
Business device request data, after receiving respective data blocks DATA_REPLY, this DTD.
Above-mentioned steps 4) detailed process be:
41) sending the smart mobile phone communication node of data, i.e. node A is when carrying out multi-hop transmission data package transfer,
To sending the smart mobile phone communication node of request, i.e. packet rs destination node B carries out record；
42) if this packet is at certain node C being forwarded in this subnet before, then joint it is recorded as
Point B data block overlap C to node CB-C, and by the B data block overlap number of times to C in local record
Add one；
43) if there is not this data block in local cache, then the historical record according to packet rs destination node B can
Obtain the arbitrary node N data block overlap times N to node B in same subnetN-C, destination node can be obtained simultaneously
Packet sum N for node BB;Node N data block Duplication P to node B is calculated by following formulaC:
Nodes all to same subnet calculate corresponding PC, and take the maximum therein self adaptation as this data block
Cache algorithm eliminates weights；
44) by this data block with step 43) described in caching eliminate weights and be stored in caching；Work as buffer memory capacity
By time full, the data block relatively low by preferentially eliminating weights, two data blocks equal for weights then take LRU
I.e. Least Recently Used algorithm is eliminated.
The operation principle of the present invention is: multiple smart mobile phone nodes are formed in this locality by Wi-Fi ad-hoc network
Autonomous system, and in autonomous system, build P2P overlay network, it is achieved data are transmitted.When carrying out Streaming Media
During broadcasting, first smart mobile phone node asks respective data blocks to other node in local P2P overlay network,
And if only if time this locality cannot find relevant data block, by 3G network to remote server request data, from
And realize the broadcasting of Streaming Media.
Beneficial effects of the present invention: it can make multiple smart mobile phone node form autonomous system in this locality, and in autonomy
Share respective data cached in system, it is achieved collaborative download.For operator, the present invention can be effective
Reduce the bandwidth pressure that 3G network is caused by mobile stream medium service.For terminal use, energy of the present invention
Enough effective reduction 3G network flows while improving mobile flow medium broadcast performance.
Accompanying drawing explanation
Fig. 1 system data flow process figure,
UML sequential chart between Fig. 2 scheduler module, task manager and caching,
Fig. 3 task manager state transition graph,
The abstract acquisition process of data in Fig. 4 system,
The typical multi-hop transmission scene of Fig. 5 mono-,
Mono-typical overlapping matrix of Fig. 6.
Detailed description of the invention
The present invention is described in detail below in conjunction with the accompanying drawings.
A kind of mobile P 2 P stream media system towards smart mobile phone of the present invention, has including several
The smart mobile phone of Wi-Fi network interface card and 3G module, as communication node, is built with on each mobile phone:
P2P overlay network manager: for forming P2P overlay network between smart mobile phone to carry out abstract data
Transmission, and data resource positioning function is provided so that the smart mobile phone of each addition P2P overlay network can pass through
One globally unique mark searches corresponding data in other mobile phone；
Data task manager: use state machine model that the unification of each data task vital stage is managed, and
Other module in notice system when data task state changes, thus realize packet loss functions of retransmission；
3G download manager: when finding related data in local P2P overlay network, smart mobile phone leads to
Cross 3G network and ask corresponding data to remote server, thus ensure the lasting broadcasting of Streaming Media；
Streaming media server: the media player installed on smart mobile phone is to building at local streaming media server
Request data, media request is converted to request of data by streaming media server, thus realize media player can
And the data exchange between bottom；
After these smart mobile phones start and run all above manager, i.e. one mobile P 2 P Streaming Media of composition
System, can carry out data exchange by local Wi-Fi network between each smart mobile phone, and download this from 3G network
The data block that ground lacks.
Adaptive cache manager: carry out in multi-hop data transmission in P2P overlay network bottom layer realization is adaptive
Should cache.
Fig. 1 is data flowchart during system operation, continuously to flowing matchmaker when media player carries out streaming media playing
The request of data that body server is submitted to is the main matter maintaining systems stay to run.When media player stops number
During according to request, system is automatically into dormancy.
Media player is interacted with streaming media server by HTTP Streaming transfer protocol.Media play
By reading certain primary data from file header order when device commences play out, through separator, audio/video decoding
The follow-up data that is calculated of device reads side-play amount.After media player i.e. reads further according to this displacement subsequently
Continuous data, and player can be calculated next step document misregistration read according to the follow-up data read
Amount, thus realize the gradual broadcasting of media file.Media player passes through the gradual streaming media of HTTP
Calculated file displacement is converted into and meets the HTTP request of HTTP1.1 agreement and be committed to Streaming Media by agreement
Server, thus it is successfully realized the conversion between playback of media files point and document misregistration amount.
Streaming media server resolves receiving after the HTTP request of DST PLAYER, obtains obtaining
The data start in units of byte taken and length, and it is converted into cache blocks volume general in system
Number.The cache blocks size used in system at present is 48KB, this cache blocks size take into account addressing convenience and
Local disk write performance.Streaming media server is using 48KB as unit, thus obtains requested data and be positioned at
Data block numbering and side-play amount in data block, and these information are committed to scheduler module.
As in figure 2 it is shown, scheduler module first checks for whether there is respective data blocks in local cache, if existing,
Directly return.
If there is not respective data blocks in local cache, data task is committed to task manager by scheduler module,
And start to other node requests data.Whole process can be divided into following steps:
1. node passes through P2P overlay network to periphery node broadcasts request of data BITMAP_REQUEST, data
Comprising the globally unique identifier of this data block in request, this data task state becomes simultaneously
BITMAP_REQUEST_SENT。
2. other node is after receiving request of data BITMAP_REQUEST that step 1 interior joint is broadcasted,
The ability of offer data, services external to local node is estimated, and assessment content includes:
(1) whether local cache contains corresponding data block
(2) whether local hardware resources state and network condition can be that other node provides service.
After being really recognized as the offer service of other node, node will send to request of data source and reply
BITMAP_REPLY。
3. node is after receiving BITMAP_REPLY, and corresponding data task status is become by task manager
BITMAP_RECEIVED, and the BITMAP_REPLY received reply is carried out record, form local neighbours' joint
Point list, and pick out comprehensive according to indexs such as network delay, average communication bandwidth in neighboring node list
Node that can be higher, and it is sent to data sending request DATA_REQUEST, data task state becomes simultaneously
For DATA_REQUEST_SENT；
4. neighbor node is after receiving data sending request, sends respective data blocks DATA_REPLY to source node；
5., after source node receives respective data blocks DATA_REPLY, data task state becomes end-state
DATA_RECEIVED, this DTD.
Data task is mainly managed by data task manager as follows:
1) data task has original state BITMAP_REQUEST_SENT, generation when being added into task manager
The BITMAP_REQUEST packet of this data task of table is broadcasted the most in a network, and waits other node
Response；
2) when receiving the response BITMAP_REPLY of other node, data task state becomes
BITMAP_RECEIVED state, represents this data task and has got at least one response.And simultaneously to this source
Node sends BITMAP_REPLY；
3) data task being in BITMAP_RECEIVED state still keeps after receiving BITMAP_REPLY
BITMAP_RECEIVED state, but carry out the source node corresponding to BITMAP_REPLY recording to form neighbour
Occupy node listing；
4) node in neighboring node list is screened by system, and sends request of data DATA_REQUEST,
Data task state becomes DATA_REQUEST_SENT；
5) receiving after the data of neighbor node, data task state becomes DATA_RECEIVED, represents
Data task completes；
The communications protocol that at present system is used makes the State Transferring of each data task as it is shown on figure 3, by right
Task state transition figure is modified, and task manager can support the data task pipe that any communications protocol is brought
Reason.Task manager use TTL(Time To Live) mechanism data task is managed.Task management
By a newly-built scanning thread when device initializes, task list is scanned by thread by timing, and when scanning
The ttl value of this data task is subtracted one.When the ttl value of data task is set to zero, task is judged as losing
Losing, and remove from task manager, this event is notified upper layer module by task manager simultaneously.When task
When state changes, ttl value will be reset, thus avoid the data task normally performed surprisingly to be terminated.
When data task removing from task manager indicates the failure of this data task, and represent
Cannot obtain respective data blocks in local neighbor node, now system need to be by the built-in 3G network of smart mobile phone
Connect to remote media server request data, thus ensure that plays is smoothed out.In order to improve reliability
Reducing the difficulty of realization, remote media server uses the http server of standard, and smart mobile phone saves simultaneously
Communication is carried out by http protocol between point and remote server.
Corresponding data block is played out to DST PLAYER by streaming media server transmission subsequently.
In system, the abstract acquisition process of data block as shown in Figure 4, for upper layer module, fill by data acquisition
Divide the process of asynchronous I/O operation in operating system of having used for reference, thus improve performance and robustness.
Bottom P2P overlay network conceals details to upper strata, and provides inter-node communication based on identifier.
In actual application scenarios, the problem such as network signal covering, node motion will cause the generation of multi-hop communication.Many
Jump communication and can reduce the performance of network to a certain extent, therefore present invention further proposes one and be applicable to many
Jump the adaptive cache algorithm of traffic scene.
In actual scene, smart mobile phone node has less internal memory and memory space, and the most each node carries only
For limited spatial cache.The overlapping degree that this adaptive cache algorithm is asked based on internodal data is to data block
The importance of caching is estimated, for having good optimization in the case of little internal memory.
One typical multi-hop application scenarios sends request of data R as node f by multi-hop as shown in Figure 5f,
And when remote node successfully returns deblocking, deblocking will be forwarded to node f from node e.One
After the section time, node g sends request of data R also by multi-hopg, RfWith RgRequest for same deblocking.
In the case of not introducing nodal cache, the data that now node f is asked will be forwarded to from node e equally
Node g, thus cause the multi-hop data request once repeated, this phenomenon is referred to alternatively as a minor node g to joint
The overlap of some f.
After introducing nodal cache, the representative node e in this autonomous system, deblocking will be cached.
After node f successfully gets deblocking, the request of node g directly will be responded by node e, thus
Avoid a multi-hop data request.
Therefore, node N is represented for non-in same autonomous system1And N2If they are to same deblocking
Successively carry out multi-hop request, N might as well have been set1Request is early than N2, definable this be node N2To N1Data
Request overlap.Meanwhile, definable N2To N1Nodal cache hit rate PHFor
Wherein, C2-1For node N2To N1Request of data overlap number of times, C1For node N1Prior to node N2Institute
The request of data sum carried out, N1Have requested that but N2The most unsolicited deblocking will charge to C equally1。
PHPhysical significance for when representing node to node N1After the deblocking asked caches,
Node N2At the probability after a while same deblocking made requests on.
Owing to System Priority carries out request of data in this locality, can't pass through before completing this local data request
Cellular data network to server request data, therefore node N2To node N1Nodal cache hit rate PHCan
It is considered node N2With node N1The similarity of the newly-increased part of local cache during this period of time.
After defining the overlapping and internodal cache hit probability of internodal request of data, representing node can tie up
Protect overlapping matrix as shown in Figure 6.
The data safeguarded in matrix are row node NcTo row node NrRequest of data overlap number of times Cc-r.It is clear to
Cc-rWith Cr-cThere is different physical significances.
The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, it is noted that
For those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to make
Going out some improvement, these improvement also should be regarded as protection scope of the present invention.
Claims (2)
1. towards the method for work of mobile P 2 P stream media system for smart mobile phone, should be towards the mobile P 2 P of smart mobile phone
Stream media system includes that several have the smart mobile phone of Wi-Fi network interface card and 3G module as communication node, on each mobile phone
All it is built with:
P2P overlay network manager: for formation P2P overlay network between smart mobile phone to carry out abstracts data transport, and
There is provided data resource positioning function so that the smart mobile phone of each addition P2P overlay network can pass through a globally unique mark
Corresponding data are searched in other mobile phone；
Data task manager: use state machine model that the unification of each data task vital stage is managed, and at data task
Other module in notice system when state changes, thus realize packet loss functions of retransmission；
3G download manager: when finding related data in local P2P overlay network, smart mobile phone passes through 3G network
Ask corresponding data to remote server, thus ensure the lasting broadcasting of Streaming Media；
Streaming media server: on smart mobile phone, the media player of installation is to building in local streaming media server request data,
Media request is converted to request of data by streaming media server, thus realize media player can and bottom between data exchange；
Adaptive cache manager: carry out the adaptive cache in multi-hop data transmission in P2P overlay network bottom layer realization；
After these smart mobile phones start and run all above manager, i.e. one mobile P 2 P stream media system of composition, each intelligence
Can carry out data exchange by local Wi-Fi network between mobile phone, and download, from 3G network, the data block that this locality lacks；
It is characterized in that this system method of work comprises the following steps:
1) when certain smart mobile phone communication node carries out streaming media playing, this smart mobile phone communication node first passes through P2P and covers
Cover net network other smart mobile phone communication node broadcast data peritropous request BITMAP_REQUEST, comprises this number in request of data
Globally unique identifier according to block；
2) other smart mobile phone communication node is receiving step 1) request of data BITMAP_REQUEST broadcasted of interior joint
After, the ability of offer data, services external to local node is estimated, and assessment content includes: whether contain in local cache right
Answer data block, and whether local hardware resources state and network condition can be that other node provides service；Send being really recognized as
After the smart mobile phone communication node of request provides service, this requested smart mobile phone communication node will send back multiple to the former
BITMAP_REPLY, forwards step 3 to)；If all requested smart mobile phone communication nodes all do not send reply BITMAP_REPLY,
Then forward step 6 to)；
3) all replies received are carried out record by the smart mobile phone communication node sending request, form local neighbor node row
Table, and pick out, according to network delay, average communication band merit, the requested intelligence that combination property is higher in neighboring node list
Energy mobile phone communication node, and it is sent to request of data DATA_REQUEST；
4) step 3) in requested smart mobile phone communication node after receiving data sending request, as the intelligence sending data
Mobile communication node sends respective data blocks DATA_REPLY to the smart mobile phone communication node sending request；
5) send after the smart mobile phone communication node of request receives respective data blocks DATA_REPLY, this DTD；
6) system is connected to remote media server number of request by the 3G network that the smart mobile phone communication node sending request is built-in
According to, after receiving respective data blocks DATA_REPLY, this DTD.
The most according to claim 1 towards the method for work of mobile P 2 P stream media system of smart mobile phone, it is characterised in that
Step 4) detailed process be:
41) sending the smart mobile phone communication node of data, i.e. node A is when carrying out multi-hop transmission data package transfer, please to sending
The smart mobile phone communication node asked, i.e. packet rs destination node B carry out record；
42) if this packet is at certain node C being forwarded in this subnet before, then node B it is recorded as to node C
Data block overlap CB-C, and B in local record is added one to the data block overlap number of times of C；
43) if local cache does not exist this data block, then can get same subnet according to the historical record of packet rs destination node B
The middle arbitrary node N data block overlap times N to node BN-C, the packet sum N that destination node is node B can be obtained simultaneouslyB；
Node N data block Duplication P to node B is calculated by following formulaC:
Nodes all to same subnet calculate corresponding PC, and it is naughty as the adaptive cache algorithm of this data block to take maximum therein
Eliminate weights；
44) by this data block with step 43) described in caching eliminate weights and be stored in caching；When buffer memory capacity is by time full, by excellent
First eliminate the data block that weights are relatively low, LRU i.e. Least Recently Used is then taked for two data blocks that weights are equal
Algorithm is eliminated.
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