CN101142565A - Switching source device, switching destination device, high-speed device switching system, and signaling method - Google Patents
Switching source device, switching destination device, high-speed device switching system, and signaling method Download PDFInfo
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Abstract
There is provided a session mobility for moving a session held between a switching source device and a communication partner to a switching destination device other than the switching source device. The switching source device transmits medium data associated with the session by multicast or broadcast prior to device switching and a switching destination candidate device receives the medium data transmitted, so that a switching destination confirmed device determined upon device switching outputs the medium data in place of the switching source device. Thus, it is possible to increase the switching speed from a switching source device to a switching destination device to such an extent that a user cannot perceive the time required for switching.
Description
Technical field
The present invention relates to realize the session mobility (session mobility) in the communication technology in the IP network and the media transport technology etc. switching source device, switch destination device, speeder switched system and use therein Signalling method.
Background technology
In recent years, the optical fiber and ADSL in fixed network, in mobile network, the wireless technology of point (spot) property that WLAN and self-organizing network (ad hoc network) are so is also popularized.And in all places, the Ubiquitous Network environment that can carry out the network connection also will become a reality.In addition, even in field of communication terminals, also developing with network home appliance and the dual-purpose terminal of public individual is the device with varied ability of representative.Therefore, thus various accesses network of strong request Ubiquitous Network environment and will have the realization that the device of diversified ability freely switches the seamless service (seamless service) of the service that can continue.
As the technology that is used to realize seamless service, three kinds of seamless technology have been proposed.First kind of technology is referred to as network seamless, is that the mobile grade that is accompanied by a portable terminal is seamlessly switched the technology that different networks continues to communicate by letter.Portable terminal has a plurality of network interfaces, and according to moving handover access net freely.Network seamless is also referred to as terminal mobility (terminal mobility) sometimes.
It is seamless that second kind of technology is called as device, is that the terminal that the user can used is seamlessly switched the technology of utilizing.Thus, can be with the session in a certain terminal is used, in other terminal continuation.This technology moves so be called as session because session is moved to other terminal.
It is seamless that the third technology is called as content, is the form of medium and the type of medium etc. seamlessly to be switched the technology of utilizing.Thus, can be according to the ability of network bands, device, surrounding enviroment etc., switching media show/reproduce.Content is seamless to be also sometimes referred to as medium adaptation (media adaptive) (medium adaptation).
No matter single these three kinds of technology are realizing that aspect the seamless service be very important, but owing to can access respectively independently effect, so still make up a plurality of can both the utilization.
As the seamless service (hereinafter referred to as " device switches ") of the seamless technology of application apparatus, consider following such situation.For example, utilize portable terminal audiovisual such as portable phone the user that data stream (streaming) film is gone home, the firm living room that enters oneself just switches to large-scale tv with display moment and continues the audiovisual film.
Usually, the display of portable terminal is little, not talkative being fit to aspect the audiovisual film.Therefore, according to moving etc., around proceeding to, under the situation of the device of the best of having found the service of can enjoying, if can switching device shifter, then value be high.
As the technology that satisfies this hope, there is the spy to open the technology of 2003-304251 communique record.Figure 26 is the technology of the device switching method in the past put down in writing on this patent gazette of expression.
In Figure 26, at first, the portable terminal that the user holds (PDA121) uses near radio to detect adjacent terminals (PC) 122, and automatically obtains the address on the communication network of this adjacent terminals (PC) 122.And this portable terminal (PDA) 121 is as the transfer source terminal, will with communication objective ground terminal (PC) 300 between carry out communicate by letter in the communication session of application level be sent to as the adjacent terminals (PC) 122 that transmits the destination terminal.
Then, with reference to description of drawings device switched system in the past.
Figure 19 is the structural drawing of device switched system in the past.This system comprises as the lower part: organize 1304 interconnective PAN (Personal Area Network) (personal area network) (hereinafter referred to as " PAN ") 1305 as device group 1304 such as the mobile node (hereinafter referred to as MN) 1301 of switching source device, object address node (hereinafter referred to as CN) 1302, the Internet 1303 as communication object, the plasma TV that becomes the switching destination device that device switches, sound equipment, PC and with MN1301 and device.
MN1301 and device group 1304 can freely communicate in PAN1305 mutually by utilizing PAN1305.And CN1302 and MN1301 communicate via the Internet 1303.CN1302 for example is the data stream server.MN1301 carries out data stream to the film that distributes from CN1302 and receives.In addition, the network between MN1301 and the CN1302 needs not to be the Internet, for example can be 3G (Third Generation) Moblie net (3GPP network).
Then, use the device inner structure of Figure 20 explanation as the MN1301 of the switching source device of implement device switching.
MN1301 comprises as the lower part: use 1401, more than one network I/F1402, the output unit 1403 that shows output, become input block 1404 with user's interface (I/F), operating system 1405, the medium transmitting element 1406 that communicates via operating system 1405 and not shown external device (ED), medium receiving element 1407, the media buffer 1408 that is used for the media data of medium receiving element 1407 receptions, the demoder 1409 that under the compressed situation of media data, is used for decoded data, be used to control the signaling unit 1410 of session, be used to find the service discovery unit 1411 of the service that the switching destination device of not shown outside provides, and control so that medium transmitting element 1406 is sent to the media data that receives the intermediate equipment 1412 of switching the destination device.
As mentioned above, MN1301 can be considered to one of device of device group 1304, and, switch the destination device and also have the structure same with MN1301.But, when not needing to move, switch the destination device and can constitute the structure of omitting application 1401, input block 1404 and medium transmitting element 1406 as switching source device.
Figure 21 is the figure that is illustrated in MN1301 and switches the message sequence between the destination device group 1304.Figure 22 is the figure that represents same message sequence with process flow diagram.Here, N the device of existence from installing 1 auto levelizer N in the suppose device group 1304.And though not shown, MN1301 is keeping carrying out other session with CN1302.In Figure 21, so-called user is meant the current user who is using MN1301, via input block 1404, indication can be offered MN1301.In addition, the arrow among Figure 21 is represented to send message from starting point to terminal point.
Use the action of precedence diagram shown in Figure 21 and flowchart text device switched system in the past shown in Figure 22.
The user who carries out the device switching uses 1404 couples of MN1301 of input block of MN1301 to indicate the demonstration request (U1) (step S1601) of the title of switching destination candidate device.
Then, accept the intermediate equipment 1412 of indication by the input block 1404 of MN1301 and pass through service discovery unit 1411, service discovery request (M1) is sent to the interior device 1～device N (step S1602) of PAN1305 together.
Then, the service discovery unit 1411 that switches the destination device is replied service discovery (M2) and is turned back to MN1301 (step S1603) when MN1301 accepts service discovery request.SSDP), SDP, the SLP of Bluetooth (registered trademark) (service location protocol: known protocol such as the positioning service agreement) as the service discovery protocol that service discovery unit 1411 uses, utilize UPnP (universa plug and play: (the simple service discovery protocol: of SSDP universal plug and play).
The service discovery unit 1411 of MN1301 receives the service discovery of adaptive switched destination device to reply (M2) and be notified to intermediate equipment 1412.Intermediate equipment 1412 generates by the switching destination candidate device tabulation that the device that provides constitutes can be provided based on this notice, and by output unit 1403 this tabulation is prompted to user (U2) (step S1604) via operating system 1405.In addition, this switching destination candidate device tabulation is the tabulation that comprises the identifier that is used for devices such as definite device name.
The user is switched the candidate device tabulation of destination from this, selects to switch destination device (U3) (step S1605) by the input block 1404 of MN1301.Selecteed switching destination device (hereinafter referred to as " switch the destination and determine device ") is notified to intermediate equipment 1412.In the precedence diagram of Fig. 5, illustrate that device 2 is selected as switching the destination device.
The intermediate equipment 1412 of MN1301 sends to device 2 (step S1606) by signaling unit 1410 with session establishment, media preparation request (M3) in order to establish session in selected device 2 and PAN1305, to carry out the transmission of medium.Simultaneously, 1412 pairs of medium receiving elements 1407 of the intermediate equipment of MN1301, medium transmitting element 1406 are notified, so that its media data that begins to receive is sent to the preparation of the device that switches the destination.As signaling unit 1410, can utilize SIP existing protocol such as (sessioninitiation protocol: session begin agreement).
At the signaling unit 1410 of the device 2 that switches the destination when MN1301 receives session establishment, media preparation request (M3), 1412 pairs of medium receiving elements 1407 of intermediate equipment, media buffer 1408 and the demoder 1409 of device 2 are indicated, and make it begin media and prepare.And when media was prepared to finish, the intermediate equipment 1412 of device 2 was prepared to reply (M4) with session establishment, media and is sent to MN1301 (step S 1607) by signaling unit 1410.
The signaling unit 1410 of MN1301 2 receives the session establishments from installing, when media is prepared to reply (M4), 1412 pairs of medium transmitting elements 1406 of the intermediate equipment of MN1301 are notified, so that medium receiving element 1407 begins from the transmission of media data (D1) (step S1608) of CN1302 reception to device 2.
The medium receiving element 1407 of device 2 receives the media data that is transmitted by MN1301, begins the storage to the media buffer 1408 of media data.When reaching the state of having stored certain media data in media buffer 1408, under the compressed situation of media data, 1412 pairs of demoders 1409 of intermediate equipment are notified, and make it begin the decoding action.Decoded data are output to output unit 1403 (D2) (step S1609) via operating system 1405.On the other hand, be under the incompressible situation at media data, the media data of being stored in the media buffer 1408 is outputed to output unit 1403 via operating system 1405.
As above such, can realize switching to the device that switches destination device 2 from MN1301.As its result, the media data of output unit 1403 that outputs to MN1301 is from installing 1403 outputs of 2 output unit.In this a series of transfer sequence, from user view switch and to MN1301 indication switch destination candidate device and show request (U1), to the time of installing till 2 output unit 1403 output datas (D2) is become the switching required time.It is short more that this switches required time, few more with the stand-by period of switching relevant user, and seamless service can further be provided.
But, during the device under such technology in the past switches, need about several seconds till service discovery is replied (M2) to begin to receiving from service discovery request (M1).And then, begin to need about several seconds till receive session establishment, media and prepare to reply (M4) from session establishment, media preparation request (M3).As a result, switch the needed time, to be that period of reservation of number becomes quite long.Thus, for example,, because the device switch reasons, watch the state of affairs of important moment such as goal scene and produce to have missed if consider just in the real-time football match of audiovisual.
Therefore, switch the needed time in order to shorten device, he shows at document " シ one system レ ス サ one ビ ス Actual Now め モ バ イ Le マ Le チ メ デ イ ァ ミ De Le ウ ェ ァ (being used to realize the mobile multimedia intermediate equipment of seamless service) " (Tai Tian Yin, feelings Reported handles the research Reported of association and accuses " モ バ イ Le コ Application ピ ユ one テ イ Application グ と ワ イ ヤ レ ス communicates by letter (mobile computer and radio communication) " No.18-35, September 7 calendar year 2001, P.261-268) in, disclose two kinds of technology, promptly periodically carried out service discovery (technology A) in advance, resulting all devices of the result of service discovery are carried out the preparation (technology B) of session establishment and media in advance.
Utilize these technology can shorten device with reference to description of drawings and switch the needed time.The structure of the terminal inner of MN1301 in the document " シ one system レ ス サ one ビ ス Actual Now め モ バ イ Le マ Le チ メ デ イ ア ミ De Le ウ ェ ア " or switching destination device, with shown in Figure 20 identical, the action difference of intermediate equipment 1412 only.Therefore, in order to distinguish, the intermediate equipment in the document " シ one system レ ス サ one ビ ス Actual Now め モ バ イ Le マ Le チ メ デ イ ア ミ De Le ウ ェ ァ " is called " high speed intermediate equipment " with intermediate equipment 1412 shown in Figure 20.
Figure 23 is the figure that is illustrated in the MN1301 in the document " シ one system レ ス サ one ビ ス Actual Now め モ バ イ Le マ Le チ メ デ イ ァ ミ De Le ウ ェ ァ " and switches the message sequence between the destination group 1304.Figure 24 is the figure with the action of the switching destination device of flowcharting document " シ one system レ ス サ one ビ ス Actual Now め モ バ イ Le マ Le チ メ デ イ ァ ミ De Le ウ ェ ァ ", and Figure 25 is the figure that switches the action of destination device with flowcharting.Here, suppose device group 1304 exists from N the switching destination device that installs 1 auto levelizer N.In addition, though not shown, MN1301 is keeping the different sessions with CN1302.
Then, switching source device and the action of switching the destination device are described.Below, about these actions, use identical label to illustrate for the part identical with textural element shown in Figure 20.
At first, use the action of flowchart text switching source device shown in Figure 24.
(step S1801 under the situation that the session with CN1302 is continuing, be), for device group 1304 is on every side carried out service discovery, the high speed intermediate equipment periodically sends to service discovery request (M1) the interior device 1～device N (step S1802) of PAN1305 together by service discovery unit 1411.On the other hand, (step S1801 not), finishes later action under the situation about not continuing with the session of CN1302.
In order to establish session and to carry out the transmission of medium, the high speed intermediate equipment is passed through signaling unit 1410 transmission session establishments, media preparation request (M3) (step S1804) to being recorded in all devices that switch the destination candidate that become that switch destination candidate device tabulation.Here, become the device that switches the destination candidate and have n (1≤n≤N) individual.
Simultaneously, the high speed intermediate equipment is notified medium receiving element 1407, medium transmitting element 1406, and the media data that makes them begin to receive is sent to the preparation (step S1805) of switching destination candidate device.
Receive the session establishment at signaling unit 1410 from becoming the device that switches the destination candidate, when media is prepared to reply (M4) (step S1806), high speed intermediate equipment standby certain hour.
During the standby of high speed intermediate equipment, (step S1807 not), carries out service discovery once more under the situation of the indication of not asking (U1) from user's switching destination candidate device demonstration.On the other hand, (step S1807 under the situation that the indication of asking (U1) from user's switching destination candidate device demonstration is arranged, be), the high speed intermediate equipment is prompted to user (U2) (step S1808) with the switching destination candidate device tabulation that inside keeps by output unit 1403.
The user selects to switch destination candidate device (U3) (step S1809) by input block 1404 from switch destination candidate device tabulation.Input block 1404 determines that with selected switching destination the device name is notified to the high speed intermediate equipment via operating system 1405.In this process flow diagram, device 2 selecteed situations are described.
The high speed intermediate equipment is notified medium transmitting element 1406, makes it begin the transmission of media data (D1) (step S1810) that medium receiving element 1407 receives from CN1302.1406 pairs of medium transmitting elements switch the transmission that the appointed media data of device 2 beginnings is determined in the destination.
The high speed intermediate equipment, sends the session cut-out and asks (M5) (step S1811) by signaling unit 1410 equipment beyond the device 2 in the middle of n the switching destination device that becomes switching destination candidate.Receive the session cut-out from these equipment and reply (M6), finish change action.
Then, use flowchart text shown in Figure 25 to switch destination candidate device and switch the action that the switching destination device of device is determined in the destination with becoming.
The service discovery unit 1411 of having accepted the switching destination device of service discovery request (M1) is replied service discovery (M2) and is sent to MN1301 (step S1901).
And when media was prepared to finish, the high speed intermediate equipment prepared to reply (M4) (step S1904) by 1410 pairs of switching source devices transmissions of signaling unit session establishment, media.
The medium receiving element 1407 that switches destination device 2 receives the media data (step S1905) that transmits from switching source device, begins media buffer 1408 medium data (step S1906).When in media buffer 1408, reaching the state of having stored a given data, the high speed intermediate equipment is (step S1907 under the incompressible situation at media data, be), the data that media buffer 1408 is stored send to output unit 1403 (step S1909) via operating system 1405.On the other hand, under the compressed situation of media data (step S1907, not), the high speed intermediate equipment is notified demoder 1409, make it begin decoding action (step S1908), and decoded data are sent to output unit 1403 via operating system 1405.The output of the media data that output unit 1403 begins to receive (D2) (step S1909) finishes change action.
On the other hand, do not become the signaling unit 1410 that switches the device of determining device in the destination when switching source device receives session and cuts off request (M5), the high speed intermediate equipment is indicated medium receiving element 1407, media buffer 1408 and demoder 1409, makes it finish media and prepares (step S1910).
And when medium receiving element 1407, media buffer 1408 and demoder 1409 finished the media preparation, the high speed intermediate equipment sent the session cut-out by 1410 pairs of switching source devices of signaling unit and replys (M6) (step S1911), finishes change action.
As above such, according to the technology described in the document " シ one system レ ス サ one ビ ス Actual Now め モ バ イ Le マ Le チ メ デ イ ア ミ De Le ワ ェ ア ", can realize at high speed switching to the device that switches the destination device from switching source device.
Promptly, there is being switching destination candidate device from the user to show before the indication of request (step S1807), begin to receive relevant action (step S1802～step S1803 and step S1909) (described technology A) from service discovery request (M1) by periodically carrying out to reply (M2) with service discovery, switching destination candidate device from the user is shown request, and can make the essence actuation time when switching is zero.Thus, realized the shortening of time of needing till the auto levelizer tabulation is prompted.
In addition, select from user's switching destination device before the indication of (step S1809) having, by to becoming all switching destination candidate devices by the resulting switching of service discovery destination candidate, carry out from session establishment, media preparation request (M3), to with (described technology B) till session establishment, media prepare to reply the relevant action of the reception of (M4) (step S1804～step S1806 and from step S1902 to step S1904), thereby be zero essence actuation time when device is switched.Thus, realized the shortening of needed time till selecteed switching destination device begins the output of media data.
As its result, shortened significantly and switched the needed time, promptly from the user view device switch and to switching source device indication switch destination candidate device and show request (U1), to the time till the output unit output medium data (D2) of the switching destination device of selection.
But, in the technology of document " シ one system レ ス サ one ビ ス Actual Now め モ バ ィ Le マ Le チ メ デ イ ア ミ De Le ウ ェ ア ", from beginning the reception of media data at selecteed switching destination device, begin to the output unit that switches the destination device (step S1905～step S1909) till the output of media data, need the time about hundreds of milliseconds, still can not fully realize seamless service.And, postpone for fear of producing, the transmitting element of switching source device sends (step S1810) according to the new media data amount that receives of receiving element, so media data media buffer, that also do not exported by switching source device that has been stored in switching source device transmits less than switching the destination device.Therefore, generation is damaged in the media data of being exported because the output unit of switching destination device can not be exported this media data amount, as a result of, becomes discontinuous output.
Summary of the invention
The objective of the invention is to, a kind of switching source device, switching destination device and speeder switched system are provided, can shorten from carrying out the media data communicating devices and switch the needed time, promptly switch from the user view device and time till the output unit of the switching destination device that media data is outputed to selection after to switching source device input media handoff request to other device.And then, the objective of the invention is to, a kind of switching source device, switching destination device and speeder switched system are provided, can realize having prevented the media data of switching source device and by switching discontinuous between the media data that the destination device exported.
Switching source device of the present invention is that the session that will establish with communication object moves to the device that switches the destination device.And especially, switching source device of the present invention comprises: service discovery unit, speeder switch unit, signaling unit, input block and output unit.This service discovery unit is obtained from contiguous communicator, and the information that provides could be provided.And, the speeder switch unit is regularly being indicated the service discovery unit arbitrarily, can this be designated as and can its inquiry be served provide, serve the information that provides based on what obtain, and decision becomes the switching destination candidate device of the switching destination of session.And, generate and put down in writing the switching destination candidate device tabulation of switching destination candidate device, simultaneously, indication is established session with switching destination candidate device.In addition, signaling unit is accepted to establish indication from the session of speeder switch unit, establishes session with switching destination candidate device.In addition, input block is accepted the switching destination candidate device list request from the user.In addition, output unit is after the switching destination candidate device list request of speeder switch unit acceptance from input block, and destination candidate device tabulation is switched in prompting.The speeder switch unit is when the device handoff request that receives from input block from the user, to signaling unit notice selected device from switch the tabulation of candidate device.Signaling unit is accepted this notice, selected device is sent switch indication.
According to this structure, switch before the candidate device list request of destination importing from the user, carry out the service discovery that is undertaken by the service discovery unit, the speeder switch unit can keep switching destination candidate device tabulation in inside.Therefore, from the user input apparatus handoff request time, can promptly switch to signaling unit and from switch destination candidate device, determine device in selected switching destination.
In addition, switching source device of the present invention also comprises medium receiving element, impact damper control module, medium transmitting element.This medium receiving element is from the communication object receiving media data and be stored in media buffer.The media data that impact damper control module control media buffer is stored.The medium transmitting element is accepted to transmit request from the media data of speeder switch unit, and the media data that media buffer is stored transmits to all switching destination candidate devices.And when the device handoff request that receives from the user, signaling unit sends the indication of the media data output that will receive to selected switching destination candidate device.
According to this structure, the medium receiving element is sent to all switching destination candidate devices according to the media data that the indication of speeder switch unit receives, and switches destination device medium data by this.Therefore, from the user input apparatus handoff request time, signaling unit determines that to selected switching destination in the middle of the candidate device of switching destination device sends the medium output notice.Thus, switch the destination and determine not medium data again of device, and can export the media data of having stored.Its result can realize reaching the speeder that the user discovers less than the degree of switching delay and switch.
In addition, in switching source device of the present invention, the impact damper control module generates and is used to control impact damper control information media buffer, that comprise impact damper control strategy or data volume.
According to this structure, when establishing session with the switching destination candidate device that becomes switching destination candidate, useful load or stem that signaling unit can append to the impact damper control information signaling message send.Thus, become the device that switches the destination candidate and pass through, can make media buffer control become the state identical with the media buffer of switching source device with reference to the impact damper control information.Its result is switched the destination device and can not increased communication delay, and can keep offering the continuity of user's media data.
Switching of the present invention destination device is from establishing the device that moves that the switching source device of session accepts session with communication object.And especially, comprise service response unit, signaling unit, medium receiving element, impact damper control module, output unit and speeder switch unit.This service response unit reply send from switching source device the inquiry that provides could be provided.In addition, the signaling unit session with communication object or switching source device that draws oneself up.And the medium receiving element is replied in the service response unit for when service can be provided, from communication object and switching source device receiving media data.In addition, the impact damper control module has been established the impact damper control information that the media buffer that receives after the session, be used to make media buffer and switching source device becomes equal state, control media buffer according to signaling unit and switching source device.In addition, output unit offers the user with the media data of media buffer.In addition, the medium output notice that the speeder switch unit receives from switching source device based on signaling unit will output to output unit from the media data that switching source device transmits.
According to this structure, switch medium receiving element medium data before the indication that receiving device switches of destination device, and become the media buffer equal state with switching source device in advance.Therefore, switch the destination device when the device handoff request that is transfused to from the user,, then can export the media data of storage immediately if from switching source device receiving media output notice.
Like this,, shorten to the imperceptible degree of user at high speed owing to device can be switched the needed time according to the present invention, so, can realize seamless service aspect the device switching.In addition, at this moment, do not increase the communication delay with communication object, and can keep switching source device and switch the continuity of the media data between the device of destination.
Description of drawings
Fig. 1 is the block scheme of structure of switching source device of the speeder switched system of expression embodiment of the present invention 1.
Fig. 2 is the switching source device in the speeder switched system of expression embodiment of the present invention 1 and switches the precedence diagram of the exchange of the message between the device group of destination.
Fig. 3 is the process flow diagram of motion flow of switching source device in the speeder switched system of expression embodiment of the present invention 1.
Fig. 4 is the process flow diagram that switches the motion flow of destination device in the speeder switched system of expression embodiment of the present invention 1.
Fig. 5 A is the key diagram that the method for the method of the media data transmission when carrying out the media data transmission and impact damper control is sent in switching source device utilization burst (burst) in the speeder switched system of embodiment of the present invention 1.
Fig. 5 B is the key diagram of the method for the method that receives of the media data when switching media data that the destination device utilizes burst to send in the speeder switched system of embodiment of the present invention 1 and receiving and impact damper control.
Fig. 6 A is that the switching source device utilization is sent in order and carried out the media data transfer approach of media data when transmitting and the key diagram of the method for impact damper control in the speeder switched system of embodiment of the present invention 1.
Fig. 6 B is the key diagram of the method for the method that receives of the media data of the media data that sends in order of the switching destination device of embodiment of the present invention 1 when receiving and impact damper control.
Fig. 7 is the figure of example of impact damper control information in the speeder switched system of expression embodiment of the present invention 1.
Fig. 8 is the block scheme of structure of device of the Signalling method of the expression speeder switched system of implementing embodiment of the present invention 1.
Fig. 9 is the process flow diagram of motion flow of device of the Signalling method of the expression speeder switched system of implementing embodiment of the present invention 1.
Figure 10 is the block scheme of structure of switching source device in the speeder switched system of expression embodiment of the present invention 2.
Figure 11 is a switching source device and switch the precedence diagram of the exchange of the message between the device group of destination in the speeder switched system of expression embodiment of the present invention 2.
Figure 12 is the process flow diagram of motion flow of switching source device in the speeder switched system of expression embodiment of the present invention 2.
Figure 13 is the block scheme that switches the structure of destination device in the speeder switched system of expression embodiment of the present invention 1.
Figure 14 is the block scheme of structure of switching source device in the speeder switched system of expression embodiment of the present invention 3.
Figure 15 is the process flow diagram that the flow process of the action when switching destination candidate device tabulation from the user of switching source device in the speeder switched system of embodiment of the present invention 3 shows request is waited in expression.
Figure 16 is the figure of the form type of expression media preparation request of the present invention (M3 ') message.
Figure 17 is the routine message content of expression media preparation request of the present invention (M3 ') when message is SIP and the figure of medium output control information.
Figure 18 is expression media preparation request of the present invention (M3 ') another the routine message content when message is SIP and the figure of medium output control information.
Figure 19 is a system construction drawing of representing the configuration example of device switched system in the past.
Figure 20 is a switching source device or switch the block scheme of the structure of destination device in the device switched system of representing in the past.
Figure 21 is a switching source device and switch the precedence diagram of the exchange of the message between the device group of destination in the device switched system that is illustrated in the past.
Figure 22 is a process flow diagram of representing the motion flow of device switched system in the past.
Figure 23 is a switching source device and switch the precedence diagram of the exchange of the message between the device group of destination in the device switched system of representing in the past.
Figure 24 is the process flow diagram of the flow process of the action of switching source device in the device switched system of representing in the past.
Figure 25 is the process flow diagram that switches the motion flow of destination device in the device switched system of representing in the past.
Figure 26 is the precedence diagram that device switching method in the past is described.
101,801 speeder switch units
102 impact damper control modules
103,1406 medium transmitting elements
104,1410 signaling units
805 medium send receiving element
806 medium output control units
807 medium output units
1001 preferential (preference) information holding units
1041 medium output control information production unit
1042 signaling messages are made the unit
1043 medium output control information extra cell
1044 signaling messages send receiving element
1301 mobile nodes (MN)
1302 object address nodes (CN)
1303 the Internets
1304 device groups
1305 PAN (Personal Area Network) (PAN)
1401 use
1402 network I/F
1403 output units
1404 input blocks
1405 operating systems
1407 medium receiving elements
1408 media buffer
1409 demoders
1411 service discovery unit
1412 intermediate equipments
1511 service response unit
2001 poll units
2002 candidate device confirmation units
2003 list management unit
Embodiment
Below, describe embodiment of the present invention in detail with reference to accompanying drawing.
(embodiment 1)
The speeder switched system of embodiment of the present invention 1 is to be used to realize that the session that will keep between switching source device and the communication object moves to the system that the session of the switching destination device beyond the switching source device is moved.
The structure of the speeder switched system of embodiment of the present invention 1 is with shown in Figure 19 identical, but mobile node (MN) 1301 and device group 1304 are respectively switching source devices related to the present invention and switch the destination device.
Fig. 1 is the figure of inner structure of the switching source device in the speeder switched system of expression present embodiment.
In Fig. 1, the switching source device of present embodiment comprises as the lower part: use 1401, more than one network I/F1402, the output unit 1403 that shows output, acceptance is from the input block 1404 of user's input, operating system 1405, the medium transmitting element 103 that carries out the transmission of media data via 1405 pairs of external device (ED)s of operating system, reception is from the medium receiving element 1407 of the media data of external device (ED), the media buffer 1408 that is used for the media data of medium receiving element 1407 receptions, the impact damper control module 102 that generates and utilize the impact damper control information, be used for demoder 1409 to compressed media data decoding, be used to control signaling unit 104 with the session of external device (ED), be used to find the service discovery unit 1411 of the service that the communicator of contiguous outside provides, and the media data that 103 outputs receive medium receiving element 1407 to the medium transmitting element sends the speeder switch unit 101 of the indication of switching destination candidate device to.
In the above-described configuration, speeder switch unit 101, impact damper control module 102, medium transmitting element 103 and signaling unit 104 are inscapes unlike previous technologies.Here, speeder switch unit 101 is the parts that replace high speed intermediate equipment in the past, and being carried out function change and function increases.Impact damper control module 102 does not have in structure in the past, is the inscape that increases newly, generates the impact damper control information of switching the reference when the media buffer of destination device is switched in control of destination candidate device.In addition, medium transmitting element 103 and signaling unit 104 are to increase the parts that part of functions forms in parts in the past.That is, medium transmitting element 103 can also carry out the transmission of the media data that media buffer 1408 stored, the impact damper control information that signaling unit 104 can also pass on impact damper control module 102 to generate.
Figure 13 is the figure that switches the inner structure of destination device in the speeder switched system of expression present embodiment.
In Figure 13, service response unit 1511 be the service discovery unit 1411 from switching source device is sent, the parts that the inquiry that provides is replied can be provided.In addition inscape is with shown in Figure 1 identical.
In addition, switching the destination device can also become and the identical structure of switching source device shown in Figure 1.At this moment, this device can be regardless of handover source, switch the destination and utilize.
Fig. 2 is expression with switching source device and switches the figure of the relevant order of message between the device group of destination.Fig. 3 is the process flow diagram of the action of explanation switching source device.Fig. 4 is the process flow diagram that the action of destination device is switched in explanation.Here, in the device group, suppose to exist N device from installing 1 auto levelizer N.In addition, though not shown, switching source device is keeping different sessions with CN.
Then, use Fig. 2 and Fig. 3 that switching source device and the action of switching the destination device are described, the action of switching source device at first is described.About the not action of explanation especially, be identical with the action of switching source device in the past shown in Figure 24.
Under the situation that the session with CN1302 is continuing (step S301 is), the device group 1304 of 101 pairs of peripheries of speeder switch unit is carried out service discovery.For this reason, speeder switch unit 101 together sends to device N (step S302) in timing arbitrarily from the device 1 in the PAN1305 with service discovery request (M1) by service discovery unit 1411.Service discovery request (M1) be after session is established with arbitrarily regularly or the information that periodically sends, be the cycle transmission for example with 10 minutes.On the other hand, (step S301 not), finishes later action under the situation about not continuing with the session of CN1302.
101 pairs of impact damper control modules 102 of speeder switch unit are indicated, and make that switching destination candidate device generates the impact damper control information (step S304) that is used to control the media buffer of switching the destination device.Impact damper control module 102 is accepted this indication, thereby generates the impact damper control information.In addition, discuss about impact damper control information back.
At this moment, signaling unit 104 is being recorded and narrated the medium output control information that is instructed to as the stem or the useful load of the session establishment of signaling message, media preparation request (M3 ') message, and the indication of being carried out makes the output unit that switches destination candidate device forbid exporting the media data that is transmitted in this session.
And then signaling unit 104 appends the impact damper control information that impact damper control module 102 generates on the useful load of session establishment, media preparation request (M3 ') message.But the additional useful load that is not necessarily limited to of impact damper control information is appended also passable to stem.Figure 16 represents the form type of session establishment, media preparation request (M3 ') message.Session establishment, media preparation request (M3 ') message 2203 is made of message header 2201 and message payload 2202.In Figure 16, as form type one example, represented that medium output control information 2204 is attached to the situation that message header 2201, impact damper control information 2205 are attached to message payload 2202.
Simultaneously, 101 pairs of medium receiving elements 1407 of speeder switch unit and medium transmitting element 1103 are notified, and make it begin to transmit the preparation that media data (step S306) that the media data that receives and media buffer 1408 stored transmits to switching destination candidate device.
Then, receive the session establishment at signaling unit 104 from switching destination candidate device, when media is prepared to reply (M4) (step S307), 101 pairs of medium transmitting elements 103 of speeder switch unit are notified, and the beginning transmission of media data (D1 ') (step S308).This media data is the data that media buffer 1408 data of being stored and medium receiving element 1407 receive from CN1302.
During 101 standbies of speeder switch unit, (step S309 not), turns back to step S301, carries out service discovery once more under the situation from the indication of the demonstration request (U1) of user's switching destination candidate device not.On the other hand, (step S309 under the situation that the indication of asking (U1) from user's switching destination candidate device demonstration is arranged, be), speeder switch unit 101 is prompted to user (U2) (step S310) with the switching destination candidate device tabulation that inside keeps by output unit 1403.
The user selects to switch destination device (U3) (step S311) by input block 1404 from switch destination candidate device tabulation.Selected switching destination device is notified to speeder switch unit 101 via operating system 1405.Here, suppose that selecting arrangement 2 determines device as switching the destination.
In order to make the selecteed switching destination device 2 beginning media data outputs as switching the destination device, speeder switch unit 101 sends medium output notices (M7) (step S312) by signaling unit 104 to installing 2.
When medium transmitting element 103 carried out burst described later and sends, speeder switch unit 101 appended to the media data situation of impact damper control module 102 behaviours in service that generate, presentation medium impact damper 1408 the useful load of media data output notice (M7).But the additional useful load that is not necessarily limited to of media data situation also can to stem is additional.
101 couples of users of speeder switch unit are the device beyond the selected device 2 in switching destination candidate device, by signaling unit 104, sends session and cuts off request (M5) (step S313).And speeder switch unit 101 receives the session cut-out and replys (M6) from these devices, finish change action.
Then, use Fig. 4 that the action of switching the destination device is described.
The service response unit 1511 of having accepted the switching destination device of service discovery request (M1) judges whether the conditions of service shown in satisfying the user finds to ask.And under the situation that the service that is suitable for conditions of service can be provided, the service discovery that service discovery unit 1411 will be included as the formality that utilizes service is replied (M2) and is sent to MN1301 (step S401).
Then, when the signaling unit 104 that switches destination candidate device receives session establishment, media preparation request (M3 ') from switching source device (step S402), from message, take out medium output control information and impact damper control information, and send to speeder switch unit 101.Speeder switch unit 101 is known and is forbidden exporting the media data that transmits to output unit in this session according to medium output control information.And 101 pairs of medium receiving elements 1407 of speeder switch unit, media buffer 1408 and demoder 1409 are indicated, and receive with the beginning medium and prepare and handle preparation (step S403).The impact damper control information that receives sends to impact damper control module 102 from speeder switch unit 101, is used to control media buffer 1408.
And when these prepared to finish, speeder switch unit 101 sent the session establishment by 1410 pairs of switching source devices of signaling unit and replys (M4) (step S404).
Then, and the media data that the medium receiving element 1407 reception switching source devices of switching destination device 2 transmit by multicast or broadcasting (D1 ') (step S405), begin to media buffer 1408 medium data (step S406).Speeder switch unit 101 sends to impact damper control module 102 with media control information.Impact damper control module 102 utilizes this information to control, and makes media buffer 1408 become the store status of the media data identical with the media buffer of switching source device.Here, the store status of so-called media data is identical to be meant, for example in animation, the quantity of the frame of storage or the frame number of storage etc. are identical.
The speeder switch unit 101 that switches destination device 2 is known the selecteed information of destination device of switching when receiving from media data output notice (M7) that switching source device sends by signaling unit 104.And speeder switch unit 101 is removed the media data of being forbidden by medium output control information and is exported to output unit 1403, advances as switching the destination and determines the processing (step S407) of device.Under the situation that media data sends by burst described later, the media data situation that speeder switch unit 101 will be attached to media data output notice (M7) sends to impact damper control module 102.Impact damper control module 102 utilizes the information of this media data situation to control, and makes media buffer 1408 become the state identical with the media buffer of switching source device.
Receive when request (M5) is cut off in the session that switching source device sent by the signaling unit 104 of the switching destination candidate device beyond the specified switching destination device of user 2,101 pairs of medium receiving elements 2107 of speeder switch unit are indicated, and make it finish the reception of media data.And then 101 pairs of media buffer 1408 of speeder switch unit and demoder 1409 are indicated, and make that finishing media prepares (step S411).
And when finishing the media preparation, speeder switch unit 101 sends the session cut-out by 1410 pairs of switching source devices of signaling unit and replys (M6) (step S412), finishes change action.
In step S407, becoming when media buffer 1408 stored the state of certain media data, at media data is (step S408 under the incompressible situation, be), speeder switch unit 101 sends to output unit 1403 (step S410) via the media data (D2) that operating system 1405 will be stored in media buffer 1408.
On the other hand, (step S408, not), 101 pairs of demoders 1409 of speeder switch unit are notified, and make it begin decoding action (step S409) under the compressed situation of media data.Demoder 1409 sends to output unit 1403 with decoded media data via operating system 1405.Output unit 1403 begins to export the media data (D2) (step S410) that receives, and finishes change action.
As above like this, the speeder switched system of embodiment of the present invention 1, the user is switched destination candidate device list request to switching source device input before, switching source device is retrieved in advance and is switched destination candidate device, media data is stored in these devices, so, when the user input apparatus handoff request, just show switching destination candidate device by retrieval, and, determine that by user-selected switching destination device can export the media data of having stored immediately.Thus, switching the time play by switching till the device output data of destination from user view becomes below 100 milliseconds, can realize that the device that the user discovers less than such high speed switches.
Then, medium output control information Figure 17,18 expression signaling units 104, that record and narrate at signaling message (M3 ') is the example of the situation of SIP.Session establishment, media preparation request (M3 ') message 2203 is the same with Figure 16, is made of message header 2201 and message payload 2202.In Figure 17 and Figure 18, also put down in writing the details of SIP stem and useful load.In SIP, and signaling message (M3 ') use invitation (INVITE) method, the following record of header field of its request (Rquire) stem or support (Supported) stem.Figure 17 represents to use the example of request (Require) stem as medium output control information 2204.
Require:Media-Buffering-Only
Supported:Media-Buffering-Only
Wherein, " Media-Buffering-Only " is the selected marker that is defined.
As other example, invite the following record of header field of association (Contact) stem of (INVITE) method.
Contact:<sips:alice@client.ndc.example.com>；audio；video；mobility＝“fixed”；mediahandling＝“bufferonly”
Wherein, " mediahandling " is media characteristic (feature) mark that is defined.
And then, as another example of the SDP (Session DescriptionProtocol) that uses one of useful load among the SIP, to the following record of attribute (attribute) of SDP.Figure 18 represents the employed example of attribute as medium output control information 2204.
a＝bufferOnly
Wherein, " bufferOnly " is the attribute that is defined, and expression only allows storage.
By signaling message (M3 ') being recorded and narrated such medium output control information, the speeder switch unit 101 of switching source device is informed in the media data that transmitted in this session purpose to media buffer 1408 storages, and to the forbidden information of the output of output unit 1404.
Then, describe the media buffer 1408 of switching source device and carry out the action (step S304) of impact damper control module 102 of storage control of media data and the action (step S308) of the medium transmitting element 103 of the media data that the media buffer 1408 of transmission switching source device is stored in detail.
At first, use Fig. 5 and Fig. 6, the media data transmission method of medium transmitting element 103 is described.According to the network bands between switching source device (MN1301 etc.) and the communication object (CN1302 etc.), and switching source device (MN1301 etc.) and switch the relation of the size of the network bands (hereinafter referred to as ' frequency band of PAN ') between destination device (device group 1304), the method for media data transmission is divided into two kinds.
Under the situation of frequency band greater than the network bands between switching source device and switching object of PAN, the burst that medium transmitting element 103 carries out media data sends.Here, burst sends and to be meant, with transmit data that the action standby stores to media buffer reach a certain amount of till, and when reaching a certain amount of, with the unified once method that sends of the data of being stored.For example, be under the situation of animation at medium, gather a plurality of frame amounts and send.
Fig. 5 A, Fig. 5 B are happen suddenly the figure to the transmission of media data method of the storage of media buffer 1408 and medium transmitting element 103 when sending of explanation.Fig. 5 A, Fig. 5 B are that the cut-away view from switching source device shown in Figure 1 only extracts the required inscape of explanation and the figure that represents, give same label to the inscape identical with Fig. 1.
Fig. 5 A represents the formation of switching source device, and Fig. 5 B represents to switch the formation of destination device.In Fig. 5 A, Fig. 5 B, the detailed state of the media data that store the inside of presentation medium impact damper 1408.In addition, in Fig. 5 A, Fig. 5 B, illustrate that employed medium are compressed animation, and give frame number each frame.The media buffer 1408 of the switching source device shown in Fig. 5 A is in the state of storage frame 4 to frame 13.At this moment, frame 14 is to be received by medium receiving element 1407 and will newly add in media buffer 1408.In addition, frame 3 is sent to demoder 1409 from media buffer 1408, and after decoding, from output unit 1403 outputs.The media buffer 1408 of the switching destination device shown in Fig. 5 B to send in order happening suddenly and logically to be divided into two impact dampers, and sets, and makes the memory data output of a logic gate buffer surpass the burst transmission buffering capacity of regulation.
Then, medium transmitting element 103 with these data (in Fig. 5 A, Fig. 5 B from frame 7 to 11) via PAN1305 to switching disposable unified transmission of destination device.Here, so-called burst sends the lower limit that buffering capacity is the data volume that sent by a secondary burst, and the data that the logic gate buffer of the media buffer 1408 by switching source device is stored surpass burst and send buffering capacity, and transmission happens suddenly.When happening suddenly transmission, data are transfused to media buffer 1408, and, from 1408 pairs of demoder 1409 output datas of media buffer.But because media buffer 1408 has two logic gate buffers, when happening suddenly transmission, the data of being imported (frame 12,13,14 etc.) are stored in the logic gate buffer that happens suddenly and send.In addition, the data of being exported (frame 3,4,5 etc.) are stored in the logic gate buffer that happens suddenly and send, and from this logic gate buffer output.So the data of the logic gate buffer (logic gate buffer on the right side of Fig. 5 A) of a side relevant with the burst transmission are not subjected to the influence of the data input and output in the media buffer 1408 when burst sends.The medium receiving element 1407 that switches the destination device receives these media datas, is stored in logic gate buffer.Frame output or discarded timing hypothesis in the media buffer 1408 of the timing of demoder 1409 output frames in the media buffer 1408 of handover source and switching destination are deferred to impact damper control strategy described later (policy).The control of the media buffer of the switching source device of impact damper control module 1408 is input to the logic gate buffer identical with storage frame 12 and frame 13 with frame 14, when demoder 1409 is exported to frame 6, export according to frame 7, frame 8 such orders from another logic gate buffer.
On the contrary, under the situation of frequency band less than the network bands between switching source device and communication object of PAN1305, medium transmitting element 103 carries out the transmission one by one of media data.Here, send one by one and be meant, do not send the standby of action and always send the method for data according to certain interval.Be under the situation of animation for example, once send 1 frame amount at medium.
Fig. 6 A, Fig. 6 B be explanation when sending one by one to the storage of media buffer 1408 and to the figure of the media data transmission of medium transmitting element 103.Fig. 6 A, Fig. 6 B are the same with Fig. 5 A, Fig. 5 B, are the figure that only extracts the inscape that needs from the cut-away view of switching source device shown in Figure 1, give identical label to the inscape identical with Fig. 1.
Fig. 6 A represents the formation of switching source device, and Fig. 6 B represents to switch the formation of destination device.In Fig. 6 A, Fig. 6 B, the detailed state of the media data that the impact damper inside of presentation medium impact damper 1408 is stored.In addition, in Fig. 6 A, illustrate that employed medium are assumed to be compressed animation, give frame number to each frame.The media buffer 1408 of the switching source device shown in Fig. 6 A is in the state of frame 7 to frame 12 of having stored.At this moment, when frame 13 is received by medium receiving element 1407, newly join media buffer 1408, simultaneously, medium transmitting element 103 sends the frame that receives to switching the destination device one by one via PAN1305.In addition, frame 6 is sent to demoder 1409 from media buffer 1408, decoded after, from output unit 1403 output.
The medium receiving element 1407 of the switching destination device shown in Fig. 6 B receives the media data that is sent, and is stored in media buffer 1408.Impact damper control strategy described later is deferred in frame output or discarded timing in timing that the frame to demoder 1409 in the media buffer 1408 of switching source device is exported and the media buffer 1408 of switching the destination device.The control of the media buffer of impact damper control module 102 is input to media buffer 1408 with frame 13 frame 12 that continues, and the frame 6 that continues according to the such order of frame 7, frame 8, is exported from 1408 pairs of demoders 1409 of media buffer.
Then, the impact damper control strategy is described.
Aspect the impact damper control strategy, there are two kinds of citation forms, in practicality, two kinds of citation forms have been combined and have been used as new impact damper control strategy.First fundamental form is the constant control type of buffering capacity.This is to be transfused to and when surpassing the benchmark buffering capacity of regulation, to carry out the output of unit datas such as 1 frame in new data.The benchmark buffering capacity is meant the constant data volume that is stored in impact damper.So, can all the time the data volume that is stored in impact damper be kept constant.The constant control type of buffering capacity can reduce the data volume that is stored in impact damper by reducing the benchmark buffering capacity.Thus, can reduce and communication object between delay, so be used in well in the real-time Communication for Power such as TV phone.Its shortcoming is, is subjected to the influence of the shake of network easily, draws back under such situation in the data arrival interval, and data output can be interrupted.
Second fundamental form is the constant control type of output time.Through certain hour the time, carry out the output of unit datas such as 1 frame.So the arrival situation that is stored in the data volume meeting factor certificate of impact damper changes significantly.But, by when initialization, guarantee to be stored in the more data underflow that prevents of data volume of impact damper usually.The constant control type of output time because of output regularly for constant interval superior aspect the playback mode, so in video request program data flow communication such as (VOD), used well.Its shortcoming is that the data quantitative change that is stored in impact damper is many, and it is big that delay will become.
In fact, in view of each advantage and shortcoming, these two impact damper control strategies are combined use as new control strategy.For example, move with the constant control type of buffering capacity in advance usually, arrive under the situation about obviously postponing, switch to the constant control type of output time and control in data.For example, after the data of output front, even, under the situation that new data do not reach yet, carry out data output through becoming 303 milliseconds of output reference of the constant control type of output time.In addition,, move with the constant control type of output time in advance usually, insert under a certain amount of situation, control with the constant control type of buffering capacity in the data that are stored in impact damper as other example.Promptly, the arrival of data postpones to have continued a period of time, and when the data volume that is stored in impact damper is lower than the benchmark of the constant control type of buffering capacity, become 303 milliseconds of output reference even passed through, do not export yet, and recover to export by ensuing data arrival and buffer stores amount.
The medium transmitting element 103 of switching source device carries out transmission of media data with said method.And the impact damper control module 102 of switching source device is stored control based on the impact damper control strategy that is predetermined to media buffer 1408.
Then, describe the action of impact damper control module 102 (step S406) in detail.In addition, this impact damper control module 102 is stored control, so that accepted the media buffer 1408 of the switching destination candidate device of the media data that transmitted by switching source device, becomes the state identical with the media buffer 1408 of switching source device.
The impact damper control module 102 that switches destination candidate device carries out the control of media buffer 1408 based on the impact damper control information that sends from switching source device.Fig. 7 is illustrated in the employed transmission of media data method of speeder switched system of embodiment of the present invention and the table of the impact damper control information of classifying according to the impact damper control strategy.
In Fig. 7, the impact damper control strategy is a citation form eventually, as previously mentioned, in practicality, can use new impact damper control strategy by the combination citation form.And then the media data transmission also is a citation form eventually, as previously mentioned, and in the practicality, also can be such combination, promptly at first, to store a certain amount of media data in media buffer till, carry out with the burst send mode, after storage, switch to transmission one by one.Here, the impact damper control information of three of the table of key diagram 7 kinds of situations and the buffer control method that uses it.
Sends with burst in media data transmission and to carry out, and the impact damper control strategy is when carrying out with the constant control type of output time, media control information be the benchmark output time at interval and burst send buffering capacity.Use the example shown in Fig. 5 A, Fig. 5 B, the action of impact damper control module 102 is described.Here, the benchmark output time is meant at interval, and the unit data of being stored from the output medium impact damper plays the time till next unit data of output.In Fig. 5 A, frame 3 is output to after the demoder 1409, and during through benchmark output time interval, frame 4 is output.In addition, send buffering capacity based on burst, the upper limit of the data that send of estimating to happen suddenly, and generate the logic gate buffer of media buffer 1408.The result of the maximum code amount when for example burst transmission buffering capacity being added that 1 frame is compressed is estimated as the data volume of the upper limit.
In Fig. 5 B, switching destination medium receiving element 1407 will be stored in a logic gate buffer from switching source device frame 2 to the frame 6 that sends that last time happened suddenly, and in another logic gate buffer, this less important frame 7 of sending of happening suddenly of storage is to frame 11.The impact damper control module 102 that switches destination candidate device is during from the notice (M7) (step S407) of switching source device receiving media data output beginning, based on the information of the media data situation of the media buffer of the switching source device that is attached to this message (exported till the frame 3 etc.), discarded frame (frame 2 is to frame 3) till frame 4.And then, the inner timer of impact damper control module 102 startings, and through benchmark output time interval the time, output frame 4.Impact damper control module 102 is when the output of end frame 6, from frame 7 beginnings carrying out the one by one frame output of another logic gate buffer.Then, when switching source device carries out next time burst and sends, 102 pairs of empty logic gate buffer medium data of impact damper control module.Like this, the media buffer 1408 of switching destination candidate device becomes fully the state identical with the media buffer 1408 of switching source device.
On the other hand, media data transmission is carried out in the mode that sends one by one and impact damper control strategy when carrying out with the constant control type of buffering capacity, and media control information only becomes the benchmark buffering capacity.Use the example shown in Fig. 6 B, the action of impact damper control module 102 is described.
The media buffer 1408 of switching destination candidate device is carried out control based on the benchmark buffering capacity, and when frame 12 was transfused to, (from frame 6 to frame 12) surpassed the benchmark buffering capacity because the storage data volume of media buffer 1408, and discarded frame 6.Store data volume and surpassed the benchmark buffering capacity owing to this less important frame 13 that sends one by one of input, the impact damper control module 102 that then switches the destination device is discarded frames 7.Like this, the media buffer 1108 of switching destination candidate device becomes the media buffer 1408 identical states with handover source.Here, the impact damper control module 102 that switches destination candidate device is during from the notice (M7) (step S407) of switching source device receiving media data output beginning, end frame discarded, and switch to output to demoder 1409.
Media data transmission is carried out with send mode one by one and impact damper control strategy when carrying out with the constant control type of output time, media control information be the benchmark output time at interval and the storage data volume.Use the example shown in Fig. 6 A, Fig. 6 B, the action of impact damper control module 102 is described.Here, the storage data volume is meant, in the moment that generates media control information, is stored in the data volume (unit is unit datas such as frame number) of the media buffer of switching source device, and in Fig. 6 A, the storage data volume is 6 frames.The inner timer of impact damper control module 102 starting, and based on the benchmark output time at interval and the storage data volume can be known time of the frame that store the inside of discarded or output medium impact damper 1408.For example, frame 13 goes out of use after through benchmark output time interval * storage data volume.Like this, the media buffer 1408 of switching destination candidate device becomes the media buffer 1408 identical states with switching source device.Here, the impact damper control module 102 that switches destination candidate device is during from the notice (M7) (step S407) of switching source device receiving media data output beginning, and end frame discarded switches to the output to demoder 1409.
Like this, the impact damper control module 102 that switches destination candidate device is stored control, makes the media buffer 1408 of switching destination candidate device become the state identical with the media buffer 1408 of switching source device.
As above like this, the switching source device of embodiment of the present invention 1 is when establishing session with switching destination candidate device, be attached to and come the notification buffer control information in the message, can make media buffer become the state identical with the media buffer of switching source device so switch destination candidate device.Therefore, when switching destination candidate device and be determined out switching destination device, can realize not increasing communication delay and kept the successional device of media data to switch.
In addition, the output of the medium in embodiment of the present invention control information can also be used in speeder switching purpose in addition.
For example, when making visual telephone owing to change one's clothes when waiting inconvenience to be known the appearance of oneself by the other side, with the calling video terminal establishment session of communication object in, send this medium and export control information.Thus, its output also is indicated as illegal state even the calling video terminal of communication object receives image, so the image that this calling video terminal receives can not be output.After this, changing under clothes, the inconvenient situation about having eliminated, by the calling video terminal of communication object being sent media data output notice (M7), thereby can export the image of oneself immediately at this calling video terminal from own calling video terminal.
Fig. 8 represents the structure of calling video terminal.Calling video terminal comprises: be used for the calling video terminal of communication object establish video-phone session signaling unit 104, send the medium that receive image/voice medium and send the medium output control unit 806 of output of image/voice medium that receiving element 805, control receive from communication object and the medium output unit 807 of output image/voice medium.Signaling unit 104 comprises: medium output control information generation unit 1041 generates the medium output control information that the presentation medium data are output as the information of illegal state; Signaling message generation unit 1042; Medium output control information extra cell 1043 is to the signaling message additional media output control information that is generated; And signaling message sends receiving element 1044.
Then, use Fig. 9 that the action of calling video terminal is described.
Signaling message generation unit 1042 generates the signaling message (step S901) that is used for establishing with the calling video terminal of communication object session.The output that medium output control information generation unit 1041 generates the view data that calling video terminal that expression makes communication object receives becomes the medium output control information (step S902) of illegal state.Medium output control information extra cell 1043 is attached to the medium output control information that is generated the useful load or the stem (step S903) of signaling message.Signaling message sends the calling video terminal (step S904) that receiving element 1044 sends to described signaling message communication object.
On the other hand, after the calling video terminal of communication object receives signaling message, establish video-phone session, and the transmission of beginning image/voice medium receives.But the medium output control unit of the calling video terminal of communication object does not carry out the output of view data according to the medium output control information that is added to the medium output unit in signaling message.
As above like this, medium output control information can be applicable to that also speeder switches purpose in addition.
(embodiment 2)
The structure of the speeder switched system of embodiment of the present invention 2 is except different in switching source device and the embodiment 1, and is identical with the structure shown in the embodiment 1.
Figure 10 is the figure of structure of the switching source device of expression present embodiment 2.In Figure 10, compare with the switching source device of embodiment 1, have function a part of different of prior information holding unit 1011 this point and speeder switch unit 801.This prior information holding unit 1001 is used to keep predefined user's prior information.In addition, to moving identical textural element, give identical label.
Figure 11 is expression switching source device and the figure that switches the message sequence between the device group of destination.In Figure 11, the message sequence of embodiment 1, the user to as the MN of switching source device indication switch processing that destination candidate device shows request (U1) with from having carried out on the transposing this point different to the order of switching destination candidate device (device 2, device N) and carrying out the processing of media data transmission (D1 ') as the MN of switching source device.
Figure 12 is the process flow diagram of the action of expression switching source device.
Use this Figure 11 and Figure 12, the hand-off process of the device in the following explanation present embodiment.
In Figure 12, the same with the switching source device of embodiment 1, service discovery unit 1411 receives the user of adaptive switched destination device to find to reply (M2), and is notified to speeder switch unit 801.Speeder switch unit 801 is read predefined user's prior information from prior information holding unit 1001, and based on this information, dwindles the scope of replying to the device that service can be provided.Prior information for example is the details such as size of display.And speeder switch unit 801 generates switching destination candidate device tabulation (step S1203) based on prior information and keeps in inside.When existing the switching destination candidate device that has kept to tabulate, upgrade.
Then, the switching source device of speeder switch unit 801 and embodiment 1 is the same to generate impact damper control information (step S1204), and the session that will comprise media control information and impact damper control information is established request (M3 ') and sent to and switch destination candidate device (step S1205).Meanwhile, speeder switch unit 801 is notified to medium transmitting element 103 (step S1206) with the media data transmission preparations.
Then, when speeder switch unit 801 is replied from switching destination candidate device reception session establishment, wait for the indication (step S1208) that shows request (U1) from user's switching destination candidate device.(step S1208 not), carries out service discovery once more and handles (step S1201) during during this period, not from the indication of the demonstration request (U1) of user's switching destination candidate device.
On the other hand, (step S1208 when the indication that has from the demonstration request (U1) of user's switching destination candidate device, be), 801 pairs of medium transmitting elements 103 of speeder switch unit are notified, so that it begins to switching destination candidate device transmission of media data (D1 ') (step S1209).This media data is media buffer 1408 data of being stored and the data that receive from medium receiving element 1407CN.
Then, speeder switch unit 801 is prompted to output unit 1403 (U2) (step S1210) with the switching destination candidate device tabulation that inside keeps via operating system 1405.
After this processing (the step S311～S313) identical in processing (step S1211～1213) and the embodiment 1.
As above like this, the speeder switch unit 801 of switching source device dwindles the scope of switching destination candidate device based on predefined user's prior information, so compare with the method for embodiment 1, can reduce the quantity of the switching destination candidate device of receiving media data.Thus, can subdue to switch power consumption that the destination device uses and will switch the Internet resources that destination candidate device uses in the reception of media data in the reception of media data and subdued the amount of switching destination candidate device minimizing as total amount.And then the user only selects to get final product in the middle of the switching destination candidate device that is suitable for oneself hobby, simultaneously, has saved the trouble of rolling picture etc., and selection becomes easy.
In addition, in the switching destination candidate device list request (U1) of carrying out the user afterwards, the speeder switch unit 801 of switching source device begins to transmit the media data that receives from CN by medium transmitting element 103.Thus, the transmission that speeder switch unit 801 can shorten the beginning media data plays the time till the selection of user's switching destination device, so, can subdue the needed power consumption of transmission of switching the media data before carrying out.
(embodiment 3)
The structure of the speeder switched system of embodiment of the present invention 3 is identical with the structure of embodiment 1 shown in Figure 19, and still, MN1301 is the switching source device of embodiment of the present invention 3.After the switching source device of present embodiment 3 is prepared at the end service discovery and with session establishment of switching destination candidate device and media, grasp the state that switches destination candidate device, and upgrade switching destination candidate device tabulation this point, different with embodiment 1.
Figure 14 is the figure of structure of the switching source device of expression present embodiment 3.In addition, give identical label for the inscape identical with switching source device shown in Figure 1.
In Figure 14, the switching source device of present embodiment 3 has: the poll units 2001 and comprising of situation that detect to constitute the device of PAN is switched the speeder switch unit 101 of the list management unit 2003 of candidate device confirmation unit 2002 that existing of candidate device confirm and the renewal of switching destination candidate device tabulation.
The device that 2001 pairs of this poll units constitute PAN utilizes the MAC layer to send message, under the situation of not replying within a certain period of time, thinks that the device of dont answer breaks away from (connection is lost) from PAN.Poll units 2001 directly is connected with candidate device confirmation unit 2002, at high speed swap data.
Candidate device confirmation unit 2002 detects the variation of the situation of switching destination candidate device based on the information from poll units 2001 or signaling unit 104 notices.Switch that destination candidate device can not utilize or when not allowing to utilize, be notified to list management unit 2003 detecting.
List management unit 2003 is switched the management of destination candidate device tabulation, and upgrades, and makes this tabulation always become up-to-date situation.
Before the explanation of the action of the speeder switched system that carries out present embodiment, simple declaration becomes the main cause that can not use or not allow to use by the resulting switching of service discovery destination candidate device.As shown in figure 19, the self-organizing network of PAN1305 for constituting by multiple arrangement.So for example because MN1301 moves or certain device of device group 1304 moves, the radiowave of PAN does not cover, and switches the destination device and can not become the device that has constituted PAN1305.This is first main cause.
In addition, the device of device group 1304 majority is the dingus of battery-operated type, in order to prevent power consumption, automatically switches to park mode usually.Therefore, behind service discovery, switching destination candidate device enters park mode and becomes and can not use.This is second main cause.
In addition, in switching destination candidate device, the service discovery request from the third party is arranged, under third party's priority condition with higher, can begin to provide service this third party.At this moment, the resource situation of switching destination candidate device in use changes, and becoming to provide service to switching source device, and this switchings destination device becomes and do not allow use.This is the 3rd main cause.
In the speeder switched system of present embodiment, by monitor switching the situation of destination candidate device, can be from switching destination candidate device deletion since above-mentioned three former thereby become the switching destination candidate device that can not use or not allow to use.Thus, only carry out a service discovery and periodically carry out service discovery after not needing.Perhaps can prolong the cycle of service discovery.
The action of the speeder switched system of present embodiment then, is described.The action of the speeder switched system shown in the embodiment 1 is meant, the speeder switch unit 101 of switching source device enters switching destination candidate device tabulation from the user and shows that the wait of request (U1) accepts (step S309), and (background) begins to switch the supervision this point difference of destination candidate device on the backstage simultaneously.
Figure 21 is that the switching source device of expression embodiment 3 switches the status surveillance of destination candidate device on the backstage, and switches the figure of action of the renewal of destination candidate device tabulation.
In Figure 21, speeder switch unit 101 starting candidate device confirmation units 2002, and the variation of the connection state of candidate device confirmation unit 2002 demand poll unit 2001 notice switching destination candidate devices.The device that 2001 pairs of poll units constitute PAN sends message by the MAC layer termly, and detects (so-called poll) and whether replied (step S2101) within a certain period of time.
When poll units 2001 is accepted to reply from device (step S2102), compare, exist under the situation about changing, changeable device information is notified to candidate device confirmation unit 2002 (step S2103) at connection state with device with last time poll result.Comprise device information that newly joins PAN and the device information that breaks away from from PAN in the changeable device information.
Candidate device confirmation unit 2002 is confirmed to switch destination candidate device based on changeable device information and whether is broken away from (step S2104) from PAN.Break away from from PAN if switch destination candidate device, the information that just will switch destination candidate device is notified to list management unit 2003 (step S2105).List management unit 2003 is accepted this information, this switching destination candidate device (step S2106) of deletion from switch destination candidate device tabulation.Thus, switch destination candidate device tabulation and be updated to up-to-date situation.
Then, show under the situation of request (U1) in the switching destination candidate device tabulation of having finished from the user, when having passed through official hour or the device that in candidate device confirmation unit 2002, newly joins PAN be some when above, speeder switch unit 101 finishes holding states (step S2107: be).In addition, meanwhile, candidate device confirmation unit 2002 demand poll unit 2001 finish to candidate device confirmation unit 2002 notice changeable device information (step S2108).Thus, switch the status surveillance of destination candidate device on the backstage, switch the release of the renewal of destination candidate device tabulation.
On the other hand, (step S2107: under the situation not), return step S2102, poll units 2001 is poll repeatedly in speeder switch unit 101 continuous alert status.
Utilize above background action, the candidate device tabulation of switching destination is retained up-to-date state, waits for during switching destination candidate device tabulation demonstration request (U1) (the step S309) that accepts from the user so can prolong speeder switch unit 101 significantly.Its result compares with embodiment 1, can increase user's reality significantly and can carry out the chance that seamless speeder switches.
Then, below describe in detail because described the 3rd main cause, the speeder switched system of present embodiment becomes the action that does not allow the situation used for the switching destination candidate device that is obtained by service discovery.
Switch destination candidate device for switching source device carried out the session establishment, media is prepared to reply (M4) afterwards, when the service discovery request that has from the third party, usually by finishing session establishment and media preparation, the third party is replied the information that does not allow to provide service with switching source device.But under the priority condition with higher that the service of accepting the third party provides, this switching destination candidate device provides service and becomes unallowed information and be notified to switching source device.Specifically, the speeder switch unit that switches destination candidate device sends session to switching source device and cuts off request (M5) by signaling unit.Receive by switching session that destination candidate device sends when cutting off request (M5) at the signaling unit 101 of switching source device, speeder switch unit 101 will switch destination candidate device and become and do not allow to provide the information of service to be notified to candidate device confirmation unit 2002 (step S2103).Because this switching destination candidate device has become and do not allowed to provide service, the information that therefore will switch destination candidate device is notified to list management unit 2003 (step S2105).Later action is with shown in Figure 15 identical.
As above explanation, in switching destination candidate device, having from the third party's service discovery request and beginning to provide under the situation of service this third party, this switches destination candidate device by deletion from the switching destination candidate device tabulation of switching source device, switches destination candidate device tabulation and is updated to up-to-date situation.Thus, can prolong significantly the switching destination candidate device tabulation of wait for accepting from the user show request (U1) during.Its result, user cause the action that device switches, and can improve the actual possibility that seamless speeder switches of carrying out significantly.
In addition, according to present embodiment, the candidate device confirmation unit of switching source device can detect one by one to make new advances and join the device of PAN, so can also suitably change the cycle of service discovery according to the quantity of new equipment.Thus, the service discovery unit of switching source device can also make new equipment become switching destination candidate device.
Utilizability on the industry
The present invention for and communication object between send and receive and carry out the high speed that device switches in the media data The device switched system is useful, and will install the needed time of switching, to shorten at high speed the user imperceptible Degree is suitable for realizing high seamless service. Especially, to will be by portable phone, digital photographing Switching source device when the video of the shooting such as machine, digital camera outputs to the display unit such as TV etc., cut It is useful to change the destination device.
Claims (15)
1. a switching source device will move to the session that communication object is established and switch the destination device, comprise:
The service discovery unit is obtained from contiguous communicator the information that provides could be provided;
The speeder switch unit, regularly described service discovery unit is being indicated arbitrarily, can this be designated as and make its inquiry carry out described service to provide, can carry out the information that described service provides based on what obtain, decision becomes the switching destination candidate device of the switching destination of session, and generate the switching destination candidate device tabulation of putting down in writing described switching destination candidate device, simultaneously, indication is established session with described switching destination candidate device;
Signaling unit is accepted to establish indication from the session of described speeder switch unit, establishes session with described switching destination candidate device;
Input block is accepted the described switching destination candidate device list request from the user; And
Output unit after the described switching destination candidate device list request of described speeder switch unit acceptance from described input block, is pointed out the candidate device tabulation of described switching destination,
Described speeder switch unit is when the device handoff request that receives from described input block from the user, to described signaling unit notice selected device from described switching candidate device tabulation, described signaling unit sends selected described device and switches indication.
2. switching source device as claimed in claim 1 also comprises:
The medium receiving element is from the communication object receiving media data and be stored in media buffer;
The impact damper control module is controlled the media data that described media buffer is stored; And
The medium transmitting element is accepted to transmit request from the media data of described speeder switch unit, and the media data that described media buffer is stored transmits to all described switching destination candidate devices,
When the described device handoff request that receives from the user, described signaling unit sends the indication of the described media data output that will receive to selected described switching destination candidate device.
3. switching source device as claimed in claim 2,
When establishing session with described switching destination candidate device, described signaling unit is exported useful load or the stem that control information appends to signaling message with medium and is sent, and described medium output control information is to forbid exporting the indication of switching the described media data that destination candidate device receives.
4. switching source device as claimed in claim 2,
After the user has imported described switching destination candidate device list request, described medium transmitting element will be sent to described switching destination candidate device from the media data that described communication object receives by multicast or broadcasting.
5. switching source device as claimed in claim 4,
Described speeder switches according to the predefined prior information of having put down in writing user's hobby, dwindles the scope of described switching destination candidate device.
6. switching source device as claimed in claim 2,
Described impact damper control module generates and is used to control impact damper control information described media buffer, that comprise impact damper control strategy or data volume.
7. switching source device as claimed in claim 2,
Under the situation of the frequency band between own and described switching destination candidate device greater than the frequency band between own and described communication object, described medium transmitting element carries out the burst transmission of described media data, and the impact damper that described impact damper control module generates when comprising the burst transmission is controlled needed impact damper control strategy or the buffer information of the data volume of the transmission that happens suddenly.
8. switching source device as claimed in claim 2,
Under the situation of the frequency band between own and described switching destination candidate device less than the frequency band between own and communication object, described medium transmitting element sends described media data one by one when each described medium receiving element receives, described impact damper control module generates and comprises the information that impact damper when sending is one by one controlled needed impact damper control strategy or data volume.
9. as claim 7 or 8 described switching source devices,
Described signaling unit is to the useful load or the additional described impact damper control information of stem of the signaling message that sends when establishing session with described switching destination candidate device and send.
10. switching source device as claimed in claim 9,
When described medium transmitting element carried out the burst transmission of described media data, described impact damper control module media data situation that will generate, that be stored in described media buffer was attached to the useful load or the stem of described signaling message.
11. one kind switches the destination device, from establishing moving that the switching source device of session accepts session with communication object, comprising:
The service response unit, reply send from described switching source device the inquiry that provides could be provided;
Signaling unit, session with described communication object or described switching source device draws oneself up;
The medium receiving element is replied in described service response unit when service can be provided, from described communication object and described switching source device receiving media data;
Media buffer is stored the media data that described medium receiving element is received;
The impact damper control module, establish the impact damper control information that the media buffer that receives after the session, be used to make described media buffer and described switching source device becomes equal state according to described signaling unit and described switching source device, controlled described media buffer;
Output unit offers the user with the media data of described media buffer; And
The speeder switch unit, the medium output notice based on described signaling unit receives from described switching source device will output to described output unit from the media data that described switching source device transmits.
12. switching as claimed in claim 11 destination device,
Described signaling unit is when having established session with described switching source device, and receiving media is exported control information, and described medium output control information indication forbids exporting the described media data that described medium receiving element receives,
Described speeder switch unit is forbidden the output of described media data to described output unit according to described medium output control information.
13. switching as claimed in claim 11 destination device,
The impact damper control information of the switching source device that is added in the useful load of the signaling message that receives when establishing session with described switching source device according to described signaling unit or the stem, described impact damper control module is controlled to the state identical with the media buffer of described switching source device with described media buffer.
14. a speeder switched system moves to described switching source device switching destination device in addition with the session that keeps between switching source device and the communication object, comprising:
Described switching source device is before device switches, by multicast or broadcasting, to the switching destination device transmission media data relevant with described session that switches the destination candidate; And
Switch the destination device, when the user has selected switching destination device,, the described media data that is transmitted is prompted to the user according to output notice from described switching source device.
15. a Signalling method will move to the switching source device that switches the destination device with the established session of communication object device, establish session with described switching destination device, may further comprise the steps:
Generation is used for establishing with described switching destination device the step of the signaling message of session;
Generation is used to represent to make the output of the media data that described switching destination device receives to become the step of medium output control information of the indication of illegal state;
Described medium output control information is appended to the useful load of described signaling message or the step of stem; And
Described signaling message is sent to the step of described switching destination device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP070698/2005 | 2005-03-14 | ||
| JP2005070698 | 2005-03-14 | ||
| JP361595/2005 | 2005-12-15 |
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| CN101142565A true CN101142565A (en) | 2008-03-12 |
| CN100573482C CN100573482C (en) | 2009-12-23 |
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| CNB2006800082787A Expired - Fee Related CN100573482C (en) | 2005-03-14 | 2006-03-13 | Switching source device, switching destination device, speeder switched system and Signalling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102771156A (en) * | 2009-10-30 | 2012-11-07 | 三星电子株式会社 | Method and apparatus for video communication |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102771156A (en) * | 2009-10-30 | 2012-11-07 | 三星电子株式会社 | Method and apparatus for video communication |
| US9094884B2 (en) | 2009-10-30 | 2015-07-28 | Samsung Electronics Co., Ltd | Method and apparatus for video communication |
| CN105163360A (en) * | 2009-10-30 | 2015-12-16 | 三星电子株式会社 | Method for changing communication network for video communication, and user equipment |
| CN102771156B (en) * | 2009-10-30 | 2016-01-06 | 三星电子株式会社 | For the method and apparatus of video communication |
| US9413800B2 (en) | 2009-10-30 | 2016-08-09 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
| US9609562B2 (en) | 2009-10-30 | 2017-03-28 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
| US9769724B2 (en) | 2009-10-30 | 2017-09-19 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
| US9781667B2 (en) | 2009-10-30 | 2017-10-03 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
| US9820202B2 (en) | 2009-10-30 | 2017-11-14 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
| US9961602B2 (en) | 2009-10-30 | 2018-05-01 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
| CN105163360B (en) * | 2009-10-30 | 2018-12-07 | 三星电子株式会社 | Change the method and user equipment of the communication network for video communication |
| US10200926B2 (en) | 2009-10-30 | 2019-02-05 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
| US10772019B2 (en) | 2009-10-30 | 2020-09-08 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
| US11503524B2 (en) | 2009-10-30 | 2022-11-15 | Samsung Electronics Co., Ltd. | Method and apparatus for video communication |
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| CN100573482C (en) | 2009-12-23 |
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