CN103354992B - For the method and apparatus of synchronizing moving station Media Stream during coordinated conversational - Google Patents
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Abstract
Describe a kind of method and apparatus of synchronizing moving station (that is, wireless transmitter/receiver unit (WTRU)) Media Stream during collaboration session.Between WTRU, transfer request message, stream increase request message and session updates request message can control be exchanged between application server (SCC AS) at multiple WTRU and conversation continuity.Each message can include Session Description Protocol (SDP) property column, and it comprises time synchronization information (such as, presentative time skew (PTO) information element (IE), Media Stream group identification (ID) and synchronous margin IE).SCC AS can update described time synchronization information and include the information updated in its message being sent to WTRU, and wherein WTRU time synchronization information based on described renewal can be with the Media Stream of re-synchronization each of which.
Description
Cross-Reference to Related Applications
This application claims the power enjoying the U.S. Provisional Application 61/442,008 that on February 11st, 2011 submits to
Benefit, disclosure of which is incorporated herein by reference.
Background technology
Internet protocol (IP) IP multimedia subsystem, IMS (IMS) may be configured to use coordinated conversational to pass
Send multimedia service.Coordinated conversational can include one group of two or more access leg (access legs)
It is rendered as the wireless transmission/reception list that the IMS of a long-range branch road subscribes to having at two or more
The upper relevant media of unit (WTRU).The control that can be designated as collaboration session in WTRU
Side, it is possible to wherein other WTRU of collaboration session are initiated media in the IMS of target
Transmit between the WTRU of stream.
Packet switched streaming (PSS) technology can use real-time transport protocol (rtp), advanced hypertext
Host-host protocol (HTTP) and adaptive HTTP stream are integrated in IMS.PSS technology can carry
For platform for transmit example as required in perhaps live telecast (TV) program.
Summary of the invention
Describe a kind of synchronizing moving station (that is, wireless transmitter/receiver unit during collaboration session
(WTRU)) the method and apparatus of Media Stream.Between WTRU, transfer request message, stream increase request disappear
Breath and session updates request message can control application server at multiple WTRU and conversation continuity
(SCC-AS) exchanged between.Each message can include Session Description Protocol (SDP) property column
(attribute line), it comprises time synchronization information (such as, presentative time skew (PTO) information
Element (IE), Media Stream group identification (ID) and synchronous margin (synchronization tolerance)
IE).SCC-AS can update described time synchronization information and wrap in it is sent to the message of WTRU
Include the information of renewal, wherein WTRU time synchronization information based on described renewal can with re-synchronization it
Respective Media Stream.
In one embodiment, the WTRU in described WTRU can transmit the first message, should
First message includes initial time synchronization information and performs the request of operation on Media Stream.Described
The 2nd WTRU in WTRU can receive the second message, and this second message is included on Media Stream to be held
The request of row operation and initial time synchronization information or the time synchronization information of renewal.2nd WTRU
Can be same based on initial time synchronization information, the time synchronization information of renewal or the time updated further
Its Media Stream of re-synchronization in step information.2nd WTRU can transmit and include for again same
Walk the 3rd message of the time synchronization information of its Media Stream.Oneth WTRU can receive and include for weight
4th message of the time synchronization information of the new Media Stream synchronizing described 2nd WTRU.Described first
WTRU use can be more for the time synchronization information of the Media Stream of the 2nd WTRU described in re-synchronization
The internal state of the most described WTRU.
In another embodiment, the WTRU in described WTRU can transmit the first message request
Collaboration session request is updated.The 2nd WTRU in described WTRU can receive the second message, should
Second message includes Media Stream group identification (ID) information element (IE) and synchronous margin IE.Described
Described 2nd WTRU in WTRU can synchronize described Media Stream, on Media Stream each described
Perform presentative time skew (PTO) measure and measure generation combination Media Stream PTO based on described PTO
IE。
Accompanying drawing explanation
More detailed understanding can obtain from the description be given below in conjunction with accompanying drawing way of example, its
In:
Figure 1A shows the example communication that can be implemented within one or more disclosed embodiments
System；
Figure 1B shows that the example wireless that can use in the communication system shown in Figure 1A is launched/received
Unit (WTRU)；
Fig. 1 C shows the example radio access network that can use in the communication system shown in Figure 1A
Network and Example core network；
Fig. 2 shows the example communication exchange transmitted between the WTRU of PSS session；
Fig. 3 A and Fig. 3 B together illustrates for mobile stream and the example communication of establishment synchronous collaboration session
Exchange；
Fig. 4 A and Fig. 4 B together illustrates for asynchronous cooperation session is upgraded to synchronous collaboration session
Example communication exchanges；
Fig. 5 A and Fig. 5 B together illustrates the example communication exchange for transmitting stream in simultaneous session；
Fig. 6 A and Fig. 6 B together illustrates and loses, for correction, the example communication exchange that (lack of) synchronizes；
Fig. 7 shows that conversation continuity controls the example block diagram of application server (SCC-AS)；With
And
Fig. 8 shows the example block diagram of WTRU.
Detailed description of the invention
Figure 1A shows the example communication that can be implemented within one or more disclosed embodiments
System 100.Communication system 100 can be for multiple wireless users provide such as voice, data, video,
The multiple access system of the contents such as message transmission, broadcast.This communication system 100 can make multiple wireless user
These contents are accessed by sharing the system resource including wireless bandwidth.Such as, communication system 100
One or more channel access methods can be used, such as CDMA (CDMA), time division multiple acess
(TDMA), frequency division multiple access (FDMA), orthogonal FDMA(OFDMA), Single Carrier Frequency Division Multiple Access
(SC-FDMA) etc..
As shown in Figure 1A, communication system 100 can include WTRU 102a, 102b, 102c, 102d,
Radio access network (RAN) 104, core network 106, PSTN (PSTN)
108, the Internet 110 and other networks 112, it would be appreciated that disclosed embodiment considers
Any amount of WTRU, base station, network and/or network components are arrived.Each WTRU 102a,
102b, 102c, 102d can be arranged to any class working in wireless environments and/or communicating
The equipment of type.Giving an example, WTRU 102a, 102b, 102c, 102d may be configured to transmit
And/or reception wireless signal, and subscriber equipment (UE), movement station, fixing or mobile use can be included
Family unit, pager, cell phone, PDA(Personal Digital Assistant), smart phone, meter on knee
Calculation machine, net book, personal computer, wireless senser, consumer electronics product etc..
Communication system 100 can also include base station 114a and base station 114b.Each base station 114a and 114b
Dock wireless with at least one in WTRU 102a, 102b, 102c, 102d can be arranged to
Any kind of equipment, in order to facilitate the access for one or more communication networks, such as core net
Network 106, the Internet 110 and/or other networks 112.Giving an example, base station 114a, 114b can be
Base transceiver site (BTS), node B, evolved node B(eNB), Home Node B(HNB),
Domestic eNB(HeNB), site controller, access point (AP), wireless router etc..Although base
Each in 114a, 114b of standing is described as single parts, it would be appreciated that base station 114a,
114b can include any amount of interconnection base station and/or network components.
Base station 114a can be a part of RAN 104, and wherein this RAN 104 can also include other
Base station and/or network components (not shown), such as base station controller (BSC), radio network controller
(RNC), via node etc..Base station 114a and/or base station 114b may be configured to be referred to as
Transmit in the specific geographical area of community (not shown) and/or receive wireless signal.Community can also be divided into
Cell sector.Such as, the community being associated with base station 114a is segmented into three sectors.Therefore one
In individual embodiment, base station 114a can include three transceivers, say, that each of community
Sector all has a transceiver.In another embodiment, base station 114a can use multi input
Multi output (MIMO) technology, and thus can use multiple transmitting-receivings for each sector in community
Letter machine.
Base station 114a, 114b can via air interface 116 with one or more WTRU 102a,
102b, 102c, 102d communicate, and wherein this air interface 116 can be any suitable channel radio
Letter link (such as radio frequency (RF), microwave, infrared ray (IR), ultrasound wave (UV), visible ray etc.).
This air interface 116 can use any suitable radio access technologies (RAT) to set up.
More specifically, as it has been described above, communication system 100 can be multiple access system and permissible
Use one or more channel access schemes, as CDMA, TDMA, FDMA, OFDMA,
SC-FDMA etc..Such as, the base station 114a in RAN104 and WTRU 102a, 102b, 102c
Universal Mobile Telecommunications System (UMTS) terrestrial radio such as can be implemented and access (UTRA) etc
Radiotechnics, this radiotechnics can set up air interface with wideband CDMA (WCDMA)
116.WCDMA can include that high-speed packet such as accesses (HSPA) and/or evolved HSPA (HSPA+)
Etc communication protocol.HSPA then can include high-speed downlink packet access (HSDPA) and/
Or High Speed Uplink Packet accesses (HSUPA).
In another embodiment, base station 114a and WTRU 102a, 102b, 102c can implement such as
Evolved UTRA(E-UTRA) etc radiotechnics, this radiotechnics then can use length
Phase evolution (LTE) and/or senior LTE(LTE-A) set up air interface 116.
In other embodiments, base station 114a and WTRU 102a, 102b, 102c can implement such as
The i.e. worldwide interoperability for microwave of IEEE802.16(access (WiMAX)), CDMA2000, CDMA20001X,
CDMA2000 Evolution-Data Optimized (EV-DO), interim (Interim) standard 2000(IS-2000),
Interim Standard 95(IS-95), Interim Standard 856(IS-856), global system for mobile communications (GSM),
Enhanced data rates for gsm evolution (EDGE), GSM/EDGE RAN(GERAN) etc. wireless
It is electrically accessed technology.
For example, the base station 114b in Figure 1A can be wireless router, HNB, HeNB or
AP, and any suitable RAT can be used to facilitate the wireless connections in regional area, such as seek
Industry place, house, the vehicles, campus etc..In one embodiment, base station 114b and WTRU
102c, 102d can implement the radiotechnics of such as IEEE 802.11 etc to set up WLAN
(WLAN).In another embodiment, base station 114b and WTRU 102c, 102d can implement
The such as radiotechnics of IEEE 802.15 etc sets up wireless personal local area network (WPAN).Separately
In one embodiment, base station 114b and WTRU 102c, 102d can use RAT based on honeycomb
(such as WCDMA, CDMA2000, GSM, LTE, LTE-A etc.) sets up picocell
Or Femto cell (femtocell) (picocell).As shown in Figure 1A, base station 114b can with because of
Special net 110 is directly connected to.Thus, base station 114b be not necessarily required to via core network 106 to access because of
Special net 110.
RAN104 can communicate with core network 106, and wherein this core network 106 can be by
One or more offer voices of being configured in WTRU 102a, 102b, 102c, 102d, data,
Any kind of network that voice (VoIP) in application and/or Internet protocol services.Such as, core net
Network 106 can provide Call-Control1, Billing services, service based on shift position, prepaid call,
Internetwork-ing, video distribution etc., and/or perform enhanced security feature, such as user's checking.Although
Figure 1A is shown without, it would be appreciated that RAN 104 and/or core network 106 can directly or
Those RAN employing the RAT identical from RAN 104 or different RAT are carried out with other indirectly
Communication.Give an example, except being connected it with the RAN 104 that can use E-UTRA radiotechnics
Outward, core network 106 can also be not shown with the RAN(of another use gsm radio technology)
Communicate.
Core network 106 is also used as accessing PSTN for WTRU 102a, 102b, 102c, 102d
108, the Internet 110 and/or the gateway of other networks 112.PSTN 108 can include providing common old
The circuit exchanging telephone network of formula telephone service (POTS).The Internet 110 can include the use of public affairs
The global interconnected computer networks device systems of communication protocol, such as TCP/IP the Internet protocol suite altogether
Transmission control protocol (TCP), UDP (UDP) and Internet protocol (IP) in part.
Network 112 can include the wired or wireless communication network being had by other service suppliers and/or runing.
Such as, network 112 can include another core network being connected with one or more RAN, wherein
The one or more RAN can use the RAT identical with RAN 104, it is possible to use different
RAT。
In communication system 100, some or all of WTRU 102a, 102b, 102c, 102d can include
Multimode ability, say, that WTRU 102a, 102b, 102c, 102d can be included in different nothing
The multiple transceivers communicated with different networks in wired link.Such as, the WTRU shown in Figure 1A
102c may be configured to communicate with the base station 114a using radiotechnics based on honeycomb, Yi Jiyu
The base station 114b that can use IEEE 802 radiotechnics communicates.
Figure 1B shows example WTRU 102 that can use in the communication system shown in Figure 1A.
As shown in Figure 1B, WTRU 102 can include processor 118, transceiver 120, launch/receive
Parts 122, speaker/microphone 124, keyboard 126, display/touch pad 128, non-removable deposit
Reservoir 130, removable memorizer 132, power supply 134, global positioning system (GPS) chipset 136
And ancillary equipment 138.Will be appreciated that while keeping meeting embodiment, WTRU 102
Any sub-portfolio of above-mentioned parts can be included.
Processor 118 can be general purpose processor, special purpose processor, conventional processors, number
One or more microprocessors that word signal processor (DSP), microprocessor associate with DSP core,
Controller, microcontroller, special IC (ASIC), field programmable gate array (FPGA)
Circuit, integrated circuit (IC), state machine etc..Processor 118 can perform Signal coding, data
Process, power controls, input/output processes and/or other any can make WTRU 102 at wireless environment
The function of middle operation.Processor 118 is coupled to transceiver 120, and transceiver 120 can be with coupling
It is bonded to transmitting/receiving means 122.Although processor 118 and transceiver 120 are depicted as by Figure 1B
Stand-alone assembly, processor 118 and transceiver 120 can together be integrated in Electronic Packaging or chip.
Transmitting/receiving means 122 may be configured to pass the signal to base station via air interface 116
(such as base station 114a), or receive signal from base station (such as base station 114a)..Give an example,
In one embodiment, transmitting/receiving means 122 can be arranged to transmit and/or receive RF signal
Antenna.In another embodiment, for example, transmitting/receiving means 122 can be arranged to
Launch and/or receive IR, UV or the transmitter/detector of visible light signal.In another embodiment,
Transmitting/receiving means 122 may be configured to transmit and receive RF signal and optical signal.Launch/
Receive parts 122 and may be configured to transmit and/or receive any combination of wireless signal.
Although additionally, in fig. ib transmitting/receiving means 122 is depicted as single parts, but
WTRU 102 can include any amount of transmitting/receiving means 122.More specifically, WTRU 102
MIMO technology can be used.The most in one embodiment, WTRU 102 can include two or many
It is individual that to transmit and receive transmitting/receiving means 122(of wireless signal via air interface 116 the most multiple
Antenna).
The signal that transceiver 120 may be configured to launch transmitting/receiving means 122 is carried out
Modulation, and the signal of transmitting/receiving means 122 reception is demodulated.As it has been described above, WTRU 102
Can have multimode ability.Thus, transceiver 120 can include allowing WTRU 102 by such as
Multiple transceivers that multiple RAT of UTRA and IEEE802.11 etc communicate.
The processor 118 of WTRU 102 be coupled to speaker/microphone 124, keyboard 126 and/
Or display/touch pad 128(such as liquid crystal display (LCD) display unit or Organic Light Emitting Diode
(OLED) display unit), and the user input data from these equipment can be received.Processor
118 can also export user to speaker/microphone 124, keyboard 126 and/or display/touch pad 128
Data.Additionally, processor 118 can be from any suitable memorizer (the most non-removable memorizer 130
And/or removable memorizer 132) in access information, and information is stored in these memorizeies.Described not
Removable memorizer 130 can include random-access memory (ram), read only memory (ROM),
Hard disk or other any kind of memory storage device.Removable memorizer 132 can include user
Mark module (SIM) card, memory stick, secure digital (SD) memory card etc..In other embodiments
In, processor 118 can access the memorizer (example being not physically located at WTRU 102 from those
As being positioned at server or the memorizer of home computer (not shown)) information, and data are stored in
These memorizeies.
Processor 118 can receive the power from power supply 134, and may be configured to distribution and/
Or control to be used for the electric power of other assemblies in WTRU 102.Power supply 134 can be for WTRU 102
Any suitable equipment of power supply.Such as, power supply 134 can include one or more dry cell batteries (example
Such as NI-G (Ni-Cd), nickel zinc (Ni-Zn), ni-mh (NiMH), lithium ion (Li-ion) etc.),
Solaode, fuel cell etc..
Processor 118 can also be coupled with GPS chip group 136, and this chipset may be configured to
The positional information (such as longitude and latitude) of the current location about WTRU 102 is provided.As from
Supplementing or replacement of the information of GPS chip group 136, WTRU 102 can connect via air interface 116
Receive the positional information from base station (such as base station 114a, 114b), and/or according to from two or more
The signal timing that near individual, base station receives determines its position.Will be appreciated that and keeping and embodiment
While Yi Zhi, WTRU 102 can obtain position letter by any suitable location determining method
Breath.
Processor 118 is also coupled to other ancillary equipment 138, can include among these providing additional
One or more softwares of feature, function and/or wired or wireless connection and/or hardware module.Such as,
Ancillary equipment 138 can include that accelerometer, digital compass, satellite transceiver, digital camera (are used
In photo and video), USB (universal serial bus) (USB) port, vibratory equipment, television transceiver,
Earphone with microphone, BluetoothModule, frequency modulation (FM) radio unit, digital music player, regard
Frequently game machine module, explorer etc..
Fig. 1 C shows example RAN 104 that can use in the communication system 100 shown in Figure 1A
With core network 106.As it has been described above, RAN 104 can use E-UTRA radiotechnics and via
Air interface 116 communicates with WTRU 102a, 102b, 102c.RAN 104 can also be with
Core network 106 communicates.
RAN 104 can include eNB 140a, 140b, 140c, it would be appreciated that keep with
While embodiment is consistent, RAN 104 can include any amount of eNB.eNB 140a、140b、
Each in 140c can include one or more transceiver, in order to via air interface 116
Communicate with WTRU 102a, 102b, 102c.In one embodiment, eNB 140a, 140b,
140c can implement MIMO technology.The most for example, eNB 140a can use multiple antenna
Launch wireless signal to WTRU 102a, and receive the wireless signal from WTRU 102a.
Each eNB 140a, 140b, 140c can be associated with specific cell (not shown),
And may be configured to process that provided for radio resources management determines, switching determines, up-link and/or descending
User scheduling in link etc..As shown in Figure 1 C, eNB 140a, 140b, 140c can be via
X2 interface is in communication with each other.
Core network 106 shown in Fig. 1 C can include Mobility Management Entity (MME) 142, clothes
Business gateway 144 and packet data network (PDN) gateway 146.Although each above-mentioned parts is all described
One-tenth is a part for core network 106, it should be understood that the either of which in these parts can be by core
Other entities outside heart Virtual network operator have and/or run.
MME 142 can via S1 interface with each the eNB 140a in RAN 104,140b,
140c is connected, and can serve as controlling node.Such as, MME 142 can be responsible for verifying WTRU
The user of 102a, 102b, 102c, bearing activation/deexcitation, at WTRU 102a, 102b, 102c
Initial attaching process in select particular service gateway etc..MME 142 may be provided for controlling plane
Function, in order at RAN 104 with use such as other radiotechnics of GSM or WCDMA etc
Other RAN(not shown) between switch over.
Gateway 144 can via S1 interface with each the eNB 140a in RAN 104,
140b, 140c are connected.Gateway 144 generally can route and forward to/from WTRU 102a,
The user data packets of 102b, 102c.This gateway 144 can also carry out other functions, such as, exist
Grappling user plane in handoff procedure between eNB, down link data can be used for WTRU 102a, 102b,
Paging, the context managing and storing WTRU 102a, 102b, 102c etc. is triggered the when of 102c.
Gateway 144 can also be connected with PDN Gateway 146, and this PDN Gateway can be WTRU
102a, 102b, 102c provide the access of the such as packet switching network of the Internet 110 etc, in order to promote
Become the communication between the equipment of WTRU 102a, 102b, 102c and IP enable.
Core network 106 can facilitate the communication with other networks.Such as, core network 106 can be
WTRU 102a, 102b, 102c provide the access of the such as circuit-switched network of PSTN 108 etc,
To facilitate the communication between WTRU 102a, 102b, 102c and traditional landline communication devices.Example
As, core network 106 can include or can and be used as between core network 106 and PSTN 108
The IP gateway (such as IP Multimedia System (IMS) server) of interface communicate.Additionally,
Core network 106 can be that WTRU 102a, 102b, 102c provide the access for network 112,
Wherein this network can include other the wired or wireless nets being had by other service suppliers and/or runing
Network.
Fig. 2 shows by creating transmission operation between the WTRU that collaboration session is carried out in system 200.
System 200 can include multiple WTRU 2051、2052、2053With 2054, conversation continuity control should
By server (SCC-AS) 210 and IP network 215.System 200 can use collaboration session to provide
Multimedia service.As in figure 2 it is shown, at WTRU 1051With WTRU 1052Between voice and video
Stream can be moved to WTRU 1053With WTRU 1054.Collaboration session can include one group two or
More access leg and two or more have be rendered as a long-range branch road IMS subscribe to
The upper relevant media of WTRU.A controlling party that can be designated as collaboration session in WTRU,
And can be other WTRU of collaboration session be initiated between WTRU as in the system 200 of target
The transmission of Media Stream.Session transmissions process can be carried out in system 200 with transmission session control and/
Or the Media Stream relevant to this session.
WTRU can exchange information element (IE) so that equipment room media sync realizes.These IE can
To include group identification (ID) IE(, it can mate the stream of synchronization together), presentative time offsets
(presentation time offset, PTO) IE, and synchronous margin IE.
This group ID IE can identify the stream synchronized the most together.Idle group ID(is such as, it is intended that
The value of one placeholder is 0, or the existence of mark) may be present in request to indicate network to generate
And/or distribution group ID.After response request creates this group, time synchronization information can include one
Effective group ID.
PTO IE can be used to guarantee that the synchronized playback (playback) for multiple WTRU occurs.
PTO can be calculated as follows:
PTO=is current _ playback _ time m-current-time stab, equation (1)
Wherein, current _ playback _ time can be the fragment (segment) being currently played with execution
The playback of first character joint time wall on based on clock time, and current-time stamp can be this
The timestamp of fragment, relevant with the beginning that media occur.PTO calculates and can perform at interval, and/
Or perform on all media fragments.Further, PTO calculates and can hold at random access points (RAP) place
OK.
Synchronous margin IE can be alternatively provided to multiple WTRU can trigger when flowing asynchronous
Correct operation.
By the Timing Synchronization between the PSS stream that the different WTRU in IMS collaboration session terminates
Can also include that the use of Session Description Protocol (SDP) attribute is to adhere to above-mentioned IE with media session or stream.
SDP attribute such as can be included in between WTRU any message or the message of combination in any of transmission
In.
SDP attribute can extend support the stream of two different collaboration sessions that controlled by identical device it
Between synchronization.Such as, SDP attribute can be used to the relevant stream synchronizing to go out from different server flows.
Media session describes can comprise time synchronization information.This information can be configured so that conventional value is concurrent
Deliver to equipment.Media player on the device can utilize this information to adjust its playback timing.This letter
Breath can be configured so that placeholder, such as zero.Recipient can replace placeholder with actual value, such as,
The PTO obtained from media player.
Collaboration session can be created as synchronization as described below, or can be updated to after it creates
Synchronize.
IMS signaling can be used to set up playback timing on the WTRU using PTO.When this skew quilt
When WTRU knows and uses, WTRU can on given wall clock time T0=TS0+ PTO uses
Time stamp T S0Play fragment.During playing, WTRU is responsible for keeping sufficiently large relief area with not
Offset with maintaining this under the conditions of network insertion.A kind of possible condition maintaining skew may require that all
WTRU uses clock time on identical wall.Therefore, time synchronized can be based on NTP
(NTP).
Process can be performed to measure PTO on stream in the client of WTRU, arranges on stream
Expect PTO, and produce event when measuring and may exceed the tolerance limit limited.Such as, if WTRU
Asynchronous, then at T0The actual timestamp that moment plays is TS1.When in sync, T0For TS0, institute
Can be calculated with absolute difference and be compared with synchronous margin, (poor=ABS (T0-PTO-TS1)).This result is permissible
It is used for determining that whether the time difference is more than synchronous margin.WTRU can use more new procedures to indicate this problem.
When applicable, (such as, when WTRU can not catch up with playback timing), SCC-AS may decide that use is stagnant
After PTO and send it to described WTRU and synchronize.Alternatively, SCC-AS may decide that
Initial PTO is reset for delayed WTRU.Therefore, SCC-AS can maintain and between distributing equipment
Media sync information.
The example of wheel synchronization type is that discontinuous (single shot) synchronizes and continuous synchronization.Discontinuous synchronization
Can be at PTO by originally determined and occur when can be used to and provide PTO for any new stream.For with
The mechanism of rear renewal PTO is possible.Although along with data send the probability existence of synchronizing information,
But synchronizing information can be carried via IMS signaling.
Synchronize to use RTP Control Protocol (RTCP) to realize to the Media Stream of rtp streaming.Between target
Media sync (IDMS) development RTCP extension support that equipment room Media Stream synchronizes.This based on
The mechanism of RTCP can provide timing information during whole streaming session termly.This can make playback
Adjust realization continuously.Owing to one of target can be to support two-way (e.g., IP phone (VoIP)) dialogue
Time, this adjusts continuously can be particularly useful.In this case, it is critically important for minimizing buffering, enters
And it may make to flow slack-off for unexpected network or loss is more sensitive.
PSS stream can be used to support that content-on-demand (content on demand) plays back or broadcasts live
Unidirectional content.Here, buffer capacity based on WTRU, these application types seldom need minimum
Change buffering.Therefore, different buffering scales may be used for specifically applying.Such as, session voice is worked as
Acceptable maximum delay can be the order of magnitude of hundreds of ms, several seconds slow during buffer starting
It is acceptable that punching can be considered to be content-on-demand stream.
Content is flowed, so playing back the once same of beginning owing to bigger buffering can be used to play PSS
Step is sufficient to, and this buffering can compensate major part network jitter.When equipment Inspection is asynchronous to it
Time correct operation can be triggered, but the time quantum of re-synchronization stream is limited termly.Discontinuous side
Case can reduce the quantity of the signaling relevant to time synchronized.
The example of signaling type is band and out-of-band.In the case of rtp streaming, RTCP packet can be passed through
Equipment is sent to sender.Owing to RTCP packet is generally followed by the network path identical with rtp streaming, this
In-band signaling can be referred to as.Additionally, in the case of rtp streaming, sender has in synchronizing process
Movable part.Because the HTTP of advanced person and adaptive H TTP stream can use standing (stock) HTTP
Server, so it can be first-selected for being used for synchronizing HTTP stream out-of-band signalling path.
PSS stream can include HTTP stream and rtp streaming.Following example can apply to support appointing of PSS
What stream protocol, and can allow to use different agreement to synchronize between streams.
Fig. 3 A and 3B together illustrates and transmits the operation phase between WTRU within the wireless communication system 300
Between, the example communication exchange of the collaboration session that mobile stream and establishment synchronize, this wireless communication system 300 wraps
Include packet switched streaming (PSS) adapter/server 305, conversation control function (SCF) 310, session
Seriality controls application server (SCC-AS) 315 and WTRU 3201With 3202。WTRU 3201
With 3202Each can include the application that uses during client or communication session.
As shown in Figure 3A, at WTRU 3201And set up video between PSS adapter/server 305
Stream 325 and audio stream 330, (i.e. Media Stream), and bookmark are created (335).Pass between WTRU
Defeated be performed before, WTRU 3201Time synchronization information can be obtained, (such as, institute in collaboration session
Have the current PTO of stream, synchronous margin) (340).Synchronous margin can be pre-configured, or based on stream
Character or the type in source and target WTRU are arranged.Time synchronization information can also pass through WTRU
3201It is arranged to placeholder, (such as, its value is 0), or it can provide by SCC-AS 315.
As shown in Figure 3A, WTRU3201Transfer request message 345 between WTRU can be transmitted arrive
SCC-AS 315, it SDP property column including comprising group ID IE, PTO IE and synchronous margin IE
(i.e. " a " OK), in lower column format:
A=3gpp_sync_info:idms_http<group _ ID><PTO><synchronization _ tolerance limit>.
In the example shown in Fig. 3 A, the SDP property column in message 345 may indicate that between WTRU
Synchronization requested, and can provide in addition IE with arrive this synchronize.SDP property column can be used to
Media sync information element between coding WTRU, and it is same to occur in collaboration session interior description media
In all media portions of step.
As shown in the example of Fig. 3, group ID is arranged to placeholder (0) until new group
Being created by SCC-AS 315, PTO is arranged to " 123456789 ", and synchronous margin is arranged to
“500”ms.Authorization can be checked after SCC-AS 315, create collaboration session, and such as institute
Renewal time synchronized IE needed, (such as, if do not provided by WTRU, is generated as unique group
ID, and if its be set to placeholder (" 0 "), just update time synchronized tolerance limit IE) (350).SCC-AS
Transfer request message 355 between the WTRU of the time synchronization information including renewal can be sent after 315
To WTRU 3202(that is, target WTRU).Alternatively, transfer request message 355 between WTRU
The identical initial time synchronization information that transfer request message 345 between WTRU includes can be included in.
With reference to Fig. 3 B, accept between WTRU transfer request message 355 at WTRU and set up transmission meeting
After words, PSS session is in target WTRU 3202And between PSS adapter/server 305, use bookmark
It is established (360).In 365, WTRU 3202Its stream software client behavior can be changed to consider
PTO in transfer request message 355.Specifically, present (display) of stream to user can be suitable
Ground postpones with the PTO IE in transfer request message 355 between coupling WTRU.WTRU 3202Can send out
Sending transmission response message 370 between WTRU, between this WTRU, transmission response message 370 is included in WTRU
Between identical time synchronized IE to SCC-AS 315 that includes of transfer request message 355.Replaceable
Ground, such as, if owing to client software or need the restriction of bigger buffering, at WTRU 3202
In PTO, response message 370 can not be applied can to comprise compared to being included in message 345 or message 355
In the time synchronization information including different PTO IE value updated further.Can after SCC-AS 315
With transmission response message 375 between transmission WTRU to WTRU 3201, between this WTRU, transmission response disappears
Breath 375 includes initial time synchronization information, the time synchronization information of renewal or further renewal
Synchronizing information.WTRU3201Its internal state (380) can be updated by the time synchronization information updated,
(such as, representing the data structure of the state of the collaboration session of the ID including WTRU320).385
In, if operation is Media Stream (i.e. stream) transmission, then at WTRU 3201With PSS adapter/service
Between device 305, the stream (video flowing 325) of transmission may be demolished, (such as, if contrary operation is stream
Duplication, the step for will be left in the basket).WTRU 320 can be based upon after video flowing 3902With
Between PSS adapter/server 305, and audio stream 395 is based upon WTRU 3201And PSS
Between adapter/server 305.Synchronous collaboration session 398 therefore can between WTRU transmitting procedure
Period via SCF 310 by WTRU 3201Control, thus WTRU 3201As collaboration session 398
Controlling party.Collaboration session 398 can be allocated newly " synchronization " attribute to indicate its all of Media Stream
Synchronized via all of WTRU 320.
Such as, in communication exchange as shown in figs.3 a and 3b, WTRU can be passed through1Measure at this
In client, the value in ongoing playback obtains PTO.Group ID, it is not the most by client
Known, can be configured so that the value of " unknown ", (being arbitrarily chosen as 0 in this example).Synchronize
Tolerance limit can be configured so that the value of self-configuring, or is the value (such as 0) of " unknown ", and,
In this case, can be determined by SCC-AS 315.
Group ID can be arranged once by SCC-AS 315, and it is permissible to be determined for which stream
Synchronized together.Each collaboration session can have a unique single group ID.But, at certain
In the case of Xie, two collaboration sessions can be synchronized together by sharing a group ID.SCC-AS
315 can collect from the PTO by user's initial measurement, and can be this group ID afterwards
All of stream this value is set.Subsequently, SCC-AS 315 can receive from asynchronous client
PTO adjusts.
When being received by client, PTO can be provided to the application of this client media player and lead to
Cross this should be used for using this PTO to determine which media fragment can be in given time showing.If
Playback buffer district becomes empty, and (such as: owing to temporary transient network is not enough), client application playback can be opened
Begin delayed.Client may indicate that the PTO to SCC-AS 315 that it is new, (such as, when temporary transient net
When network deficiency starts again at playback after terminating).Can be by updating all WTRU after SCC-AS 315
Use new PTO, or by asking delayed WTRU to initiate to reuse initial PTO
Re-synchronization.
If operation is that stream creates between WTRU, (i.e. flowing increase) rather than streaming, then the time is same
Step can be employed in a similar fashion.Generation process can be similar with the process shown in Fig. 3 A and 3B,
In addition to not including step 385.
Fig. 4 A and 4B together illustrates the example that asynchronous cooperation session is synchronous collaboration session for upgrading
Communication exchange.
As shown in Figure 4 A, at WTRU 3202And set up video between PSS adapter/server 305
Stream 425 and audio stream 430(i.e., Media Stream), and WTRU 3201Association is kept via SCF 310
Making the control of session 435, this SCF 310 is to transmit (wherein from WTRU between WTRU before
3201Transmitting video-frequency flow and audio frequency flow to WTRU 3202It is created during).Collaboration session in early days can
Not have any synchronization specified, and therefore, stream can not be synchronized well.As shown in Figure 4 A,
Stream (stream 425 and 430) is all by WTRU 3202Terminate, and therefore, for typically by same well
Step, this be due to video/audio synchronize by the stream client software on single WTRU typically by
Process well.But, during preparing for following operation, WTRU 3201Handle may be thought
Asynchronous collaboration session 435 changes into the collaboration session of synchronization, (such as audio stream 425 and video flowing 430
Can be replicated on another WTRU after a while).In 440, WTRU 3201May decide that mutually
Collaboration session (that is, is changed into synchronizing) by the stream of synchronous collaboration session from asynchronous.WTRU 3201Can
To send session updates request message 445, this session updates request message 445 includes using special new
Time synchronized IE of SDP line attribute, it can occur in each of SDP payload (payload)
Media-level describes in part, (as shown in Figure 4), or can occur in session level description alternatively individually
In part, to indicate its each Media Stream being applied in collaboration session.Showing shown in Figure 4 A
In example, WTRU 3201Group ID, PTO that placeholder can be used to be 0 and synchronous margin IE,
Because these values pair and WTRU 3201Unknown, and can after a while by SCC-AS 315 or
WTRU 3202Update.SCC-AS 315 can after update collaboration session, and the most more
New time synchronized IE, (such as, if WTRU does not provide, then generate unique group ID, with
And if synchronous margin IE is arranged to placeholder (" 0 "), then updating synchronous margin IE) (450).So
After, SCC-AS 315 can send session updates request message 455 to WTRU 3202。WTRU 3202
Synchronized media streams can be proceeded, (such as, mate other by presenting of one Media Stream of delay
Presenting of Media Stream), and afterwards measure two Media Streams PTO, (in this illustration, due to it
Used by single WTRU, so both should be same or mutually very close to)
(460).The PTO of combination Media Stream can measure (such as meansigma methods or maximum) from these and generate.
With reference to Fig. 4 B, WTRU 3202Can send session updates response message 465, it includes
The combination Media Stream PTO IE of SCC-AS 315.SCC-AS 315 can send session updates afterwards and ring
Message 470 is answered to arrive WTRU 3201, this WTRU 3201The time synchronization information liter of renewal can be used
Its internal state of level, (that is, the representative of collaboration session).Video flowing 480 and audio stream 485 can be same
Step.Collaboration session 490 can therefore via SCF 310 by WTRU 3201Control, thus WTRU
3201Can serve as the controlling party of the collaboration session 490 synchronized.Collaboration session 490 can distribute new " with
Step " attribute with instruction synchronized via all of Media Stream of all of WTRU 320.
Controlling party WTRU can control collaboration session and have the clothes determining service on long-range branch road
Business configuration file.This controlling party WTRU can also support the Media Stream of collaboration session, and ask with
Equipment room transmission media control relevant process.
The Media Stream of collaboration session can be supported by prosecutor WTRU and equipment room can be asked to transmit media
Control relevant process, but the controlling party of the mandate for these processes should be under the jurisdiction of by prosecutor WTRU
WTRU。
Such as, collaboration session can transmit or the stream of replication synchronization on another.Therefore, should
Controlling party WTRU can first simultaneous session to obtain PTO.This scheme can also be deposited at single stream
Time use, (termination by prosecutor WTRU).In this case, it is subsequently increased to cooperative association
Any Media Stream of words can be synchronized.
Fig. 5 A and 5B together illustrates the example communication exchange transmitting stream in simultaneous session.
As it is shown in figure 5, at WTRU 3202And set up video flowing between PSS adapter/server 305
505 and audio stream 510, (i.e. Media Stream), and WTRU 3201Keep synchronizing association via SCF 310
Making the control of session 515, this SCF 310 is to transmit (wherein from WTRU between WTRU before
3201Transmitting video-frequency flow and audio frequency flow to WTRU 3202It is created during).WTRU 3201Determine
Transmitting one and flow to himself, the stream simultaneously keeping video and audio stream to synchronize presents (520).Work as cooperation
When session is ready to be synchronized, WTRU 3201Already known time synchronized IE.WTRU 3201Permissible
Send and include transmission request 525 to SCC-AS 315 between the WTRU of time synchronized IE.SCC-AS 315
Flow message 530 can be removed by transmission one and initiate streaming, due to WTRU 3201Know
Road time synchronized IE, this removes flow message 530 and can include or not include time synchronized IE.
With reference to Fig. 5 A and 5B, but time synchronized IE, they can occur in any message 530,545,
550, any one in 565 and 570 realize when equipment room transmission operation is performed error checking and
Updated value (535,540,545,550,560 and 565) possibly.Rung by transmission between WTRU
Answer message 570, WTRU 3201Can be informed that transmission request success between its initial WTRU.
Last in process, video flowing 575 is at that time by WTRU 3201Terminate, and audio stream 580 is by WTRU
3202Terminate.Video flowing 575 and audio stream 580 can be synchronized.Therefore, collaboration session 585 is still
It is to synchronize, but also by WTRU 3201Control.
Correction loses synchronization and can be required.For example, it is possible to there is existing synchronous collaboration session, wherein
WTRU can detect that it is nonsynchronous (delayed).Therefore, WTRU can ask synchronization
Update.SCC-AS 315 can accept and update on all collaboration session streams to synchronize, or delayed
The WTRU initial PTO(of upper replacement effectively asks this WTRU " to skip " and is played back to other equipment
On current location).
Fig. 6 A and Fig. 6 B together illustrates correction and loses the example communication exchange of synchronization.
As shown in Figure 6A, at WTRU 3201And set up video between PSS adapter/server 305
Flow 625 and at WTRU 3202And set up audio stream 630 between PSS adapter/server 305,
And WTRU 3201The control of synchronous collaboration session 635 is kept, this SCF 310 via SCF 310
It is to transmit (wherein from WTRU 320 between WTRU before1Transmission audio frequency flow to WTRU 3202)
Period is created.In 640, WTRU 3201Can detect and lose synchronization.Such as, this detection
Can be at WTRU 3201Perform to occur during its PTO measurement periodically or continuously, and by itself and Tong Bu association
The PTO making session compares.If difference is more than the synchronous margin specified, then losing synchronization can be detected
Arrive.By transmission comprise time synchronized IE(it include update PTO) session updates request message
645, WTRU 3201Synchronization can be lost to SCC-AS 315 instruction.In 650, SCC-AS 315
Synchronized update message 650 can be accepted.In this illustration, SCC-AS 315 may decide that audio stream
Present to present with video flowing and mate.Should be noted that other strategies can also be carried out, (such as,
SCC-AS 315 may decide that time-out, then restarts two streams).SCC-AS 315 can send session
More newly requested message 655, this session updates request message 655 includes WTRU 3202Renewal
PTO.In 660, WTRU 3202Its audio frequency can be adjusted and be rendered as new skew, (such as, jump
Cross this and present the position to stream).
With reference to Fig. 6 B, WTRU 3202Session updates response message 665 can be sent back and arrive SCC-AS
315, it is successful for typically having identical time synchronized IE to indicate re-synchronization.It should be noted that
It is, WTRU 3202The value of amendment can also be sent, e.g., indicate it can not be resynchronized in stream
The position of request.If this situation occurs, SCC-AS 315 such as may decide that stopping stream also may
From stream, point earlier restarts.In this illustration, SCC-AS can send back session updates sound
Answer 670 to WTRU 3201Accepted with time synchronized IE that instruction updates.WTRU 3201
This new value can be stored in case using in the future, such as, in order to check again in the future in internal state
Synchronize.
Video flowing 675 and audio stream 680 are synchronized correctly now, and synchronous collaboration session 685 can
With thus via SCF 310 by WTRU 3201Control, thus WTRU 3201As synchronous collaboration meeting
The controlling party of words 685.Collaboration session 490 can be allocated newly " synchronization " attribute with indicate its own
Media Stream synchronized via all of WTRU 320.
SCC-AS 315 can refuse synchronized update.Such as, incorrect (going beyond the scope) PTO value,
Or there is too many synchronized update, can be effective reason of refusal synchronized update.Additionally, SCC-AS 315
Can be by forcing WTRU 3201Initial PTO is used to carry out re-synchronization, (such as, WTRU 3201
WTRU 320 is skipped in playback2The position play).PTO on delayed stream measures only when it
Just can be reported when stablizing.When (e.g., the company of losing in the case of increase relief area is unsatisfactory
Connect, or be not enough to catch up with the bandwidth that stream presents), do not have report to be generated.
During collaboration session, exist needs from different media server streams, different long-range branch roads and
The situation that the stream of the synchronization in different collaboration sessions will be synchronized together.This can be by two not
Same collaboration session synchronized multimedia session realizes.
The WTRU operated as the current controlling party of collaboration session can perform to transmit between new WTRU
Operation.The result of this operation can be the establishment of new collaboration session, and it can be with existing collaboration session
Synchronize.Such as, current cooperative session can have to the audio medium stream of audio system with to smart mobile phone
Video media stream.By increasing new media stream (for Voice & Video) on TV (TV), from
Another media server flows out identical content, and WTRU can create collaboration session.Controlling party
WTRU can reuse time synchronized group ID, and (from existing collaboration session), between WTRU
Transmission request creates the second collaboration session.
Fig. 7 shows the SCC-AS used in the wireless communication system 300 of Fig. 3 A, 4A, 5A and 6A
The example block diagram of 315.SCC-AS 315 can include at least one antenna 705, receiver 710,
Processor 715 and transmitter 720.Receiver 710 is configured at least one antenna 705
Transfer request message between a WTRU is received from a WTRU.Processor 715 may be configured to
Based on transfer request message between the WTRU received for operation authorization check, create collaboration session also
Generate unique Media Stream group ID.If the synchronization in transfer request message is held between a WTRU
Limit IE is arranged to placeholder (0), and processor 715 may be configured to update synchronous margin IE.Send out
Penetrate machine 720 and be configured to the time synchronization information that the transmission of at least one antenna 705 includes updating
The 2nd WTRU between transfer request message to the 2nd WTRU, the 2nd WTRU is associated with first
The collaboration session that WTRU is identical.Receiver 715 can be configured to by least one antenna 705
Transmission response message between a WTRU is received from the 2nd WTRU.Transmitter 720 can also be configured
Become and transmit between the 2nd WTRU transmission response message to a WTRU by least one antenna 705.
Receiver 710 can be configured to be received from a WTRU by least one antenna 705
First session updates request message.Processor 715 may be configured to update existing collaboration session and life
Become unique Media Stream group ID.If the synchronous margin IE quilt in the first session updates asks message
Being set to placeholder (0), processor 715 may be configured to update synchronous margin IE.Transmitter 720
It is configured at least one antenna 705 and transmits the second meeting of the time synchronization information including renewal
Talk about more newly requested message and be associated with identical with a WTRU to the 2nd WTRU, the 2nd WTRU
Collaboration session.Receiver 715 can be configured to by least one antenna 705 from the 2nd WTRU
Receive the first session updates response message.Transmitter 720 can be configured to by least one antenna
705 transmit the second session updates response message a to WTRU.
Fig. 8 shows the WTRU used in the wireless communication system 300 of Fig. 3 A, 4A, 5A and 6A
The example block diagram of 320.WTRU 320 includes at least one antenna 805, receiver 810, processor
815 and transmitter 820.Processor 815 may be configured to obtain time synchronization information (such as, when
Before PTO, synchronous margin, media group ID) and generate and include passing between the WTRU of SDP property column
Defeated request message, this SDP property column comprises media group ID IE, PTO IE and synchronous margin IE).
Transmitter 820 be configured at least one antenna 805 transmit between WTRU transmit request disappear
Breath.Receiver 810 is configured at least one antenna 805 and receives transmission sound between WTRU
Answer message.Processor 815 can be configured to use and is included between WTRU in transmission response message
The time synchronization information of renewal update its internal state.
Processor 815 can be configured to when receiving transmission between WTRU by receiver 810
Its Media Stream is provided during the PTO provided in response message and then begins to the playback of this Media Stream.
Processor 815 can be configured to determine whether to change into asynchronous by existing asynchronous cooperation session
Session and generation include the session updates request message of SDP property column, and this SDP property column comprises matchmaker
Body group ID IE, PTO IE and synchronous margin IE.Transmitter 820 is configured at least one
Individual antenna 805 transmits session updates request message.Receiver 810 is configured at least one
Antenna 805 receives session updates response message.Processor 815 can be configured to the use meeting of being included in
Words update the time synchronization information of the renewal in response message and update its internal state.
Processor 815 can be configured to the Media Stream of synchronous collaboration session, holds on each Media Stream
Row PTO measures and measures based on PTO and generates combination Media Stream PTO IE.
Embodiment
1. the media synchronizing each wireless transmitter/receiver unit (WTRU) during collaboration session
The method of stream, the method includes:
A WTRU in described WTRU transmits and includes initial time synchronization information and described matchmaker
The first message of the request of operation is performed on body stream；And
The 2nd WTRU in described WTRU receives the second message, and this second message is included in described matchmaker
Perform on body stream the described request of described operation and described initial time synchronization information or renewal time
Between synchronizing information.
2., according to the method described in embodiment 1, the method also includes:
Described 2nd WTRU is according to described initial time synchronization information, the time synchronized of described renewal
2nd WTRU described in a re-synchronization in the time synchronization information of information or renewal further
Media Stream.
3., according to the method described in embodiment 2, the method also includes:
Described 2nd WTRU transmits the 3rd message, and the 3rd message includes for described in re-synchronization the
The time synchronization information of the Media Stream of two WTRU；
A described WTRU receives the 4th message, and the 4th message includes for described in re-synchronization the
The time synchronization information of the Media Stream of two WTRU；
A described WTRU uses the time of the Media Stream of the 2nd WTRU described in re-synchronization that is used for same
The internal state of a WTRU described in step information updating.
4. according to the method described in embodiment 3, wherein said initial time synchronization information, described renewal
Time synchronization information and the time synchronization information of described further renewal include that presentative time offsets
(PTO) information element (IE).
5., according to the method described in embodiment 4, wherein said PTO is employed to ensure that and sends out for WTRU
The raw playback synchronized.
6., according to the method described in embodiment 4, wherein said PTO is based on what execution was being play
The current playback time of clock time and current time on wall during the playback of the first byte of current clip
Difference between stamp.
7. according to the method described in embodiment 6, wherein relative to the beginning of media presentation, described current time
Between stamp be the timestamp of fragment.
8. according to the method described in any embodiment in embodiment 2-7, wherein said initial time synchronized
The time synchronization information of information, the time synchronization information of described renewal and described further renewal includes media
Stream group identification (ID) information element (IE).
9. according to the method described in any embodiment in embodiment 2-8, wherein said initial time synchronized
The time synchronization information of information, the time synchronization information of described renewal and described further renewal is included in matchmaker
Body stream triggers the synchronous margin information element (IE) of correct operation time asynchronous.
10. according to the method described in any embodiment in embodiment 3-7, wherein said first message,
Each in two message, the 3rd message, the 4th message includes Session Description Protocol (SDP) property column,
This Session Description Protocol (SDP) property column comprise presentative time skew (PTO) information element (IE),
Media stream packet mark (ID) IE and synchronous margin IE.
11. according to the method described in any embodiment in embodiment 1-10, and wherein said operation is WTRU
Between transmission operation.
12. include regarding according to the method described in any embodiment in embodiment 1-11, wherein said Media Stream
Frequency stream and audio stream.
13. according to the method described in any embodiment in embodiment 1-12, wherein said collaboration session by
A WTRU in WTRU controls.
14. according to the method described in any embodiment in embodiment 1-13, wherein said first message and
Two message are that between WTRU, transfer request message or stream increase request message.
15. according to the method described in embodiment 3, and wherein said 3rd message and the 4th message are WTRU
Between transmission response message or stream increase request message.
16. 1 kinds of media synchronizing each wireless transmitter/receiver unit (WTRU) during collaboration session
The method of stream, the method includes:
A WTRU in described WTRU transmits the first message of the renewal to described collaboration session；
The 2nd WTRU in described WTRU receives the second message, and this second message includes Media Stream group
Group mark (ID) information element (IE) and synchronous margin IE；And
A described Media Stream of synchronization in described 2nd WTRU in described WTRU, at each
Perform presentative time skew (PTO) on described Media Stream measure and measure generation according to described PTO
Combination Media Stream PTO IE.
17. according to the method described in embodiment 16, and the method also includes:
Described 2nd WTRU transmits the 3rd message, and the 3rd message includes Session Description Protocol (SDP)
Property column, this Session Description Protocol (SDP) property column comprises the Media Stream PTO IE of described combination, institute
State group ID and described synchronous margin IE；
A described WTRU receives the 4th message, and the 4th message includes SDP property column；And
Described WTRU uses the Media Stream PTO IE of described combination, described group identification ID and described
Synchronous margin IE updates the internal state of described WTRU.
18. are employed to ensure that for institute according to the method described in embodiment 16, wherein said PTO measurement
State the playback that WTRU occurs to synchronize.
19. 1 kinds of conversation continuities control application server (SCC-AS), and this SCC-AS includes:
Processor, is configured to create and includes that the collaboration session of multiple Media Stream and generation include conversation description
The message of agreement (SDP) property column, this SDP property column comprises presentative time skew (PTO) information
Element (IE), Media Stream group identification (ID) and synchronous margin IE；And
Transmitter, is configured to transmit described message.
20. according to the SCC-AS described in embodiment 19, and wherein said message is wireless transmission/reception list
Between unit (WTRU), transfer request message or stream increase request message.
21. 1 kinds of conversation continuities control application server (SCC-AS), and this SCC-AS includes:
Processor, is configured to update and includes that the collaboration session of multiple Media Stream and generation include conversation description
The message of agreement (SDP) property column, this SDP property column comprises presentative time skew (PTO) information
Element (IE), Media Stream group identification (ID) and synchronous margin IE；And
Transmitter, is configured to transmit described message.
22. according to the SCC-AS described in embodiment 21, and wherein said message is that session updates asks message
Or stream increases request message.
23. 1 kinds of wireless transmitter/receiver units (WTRU), this WTRU includes:
Processor, is configured to generation and includes the message of Session Description Protocol (SDP) property column, this SDP
Property column comprises presentative time skew (PTO) information element (IE), Media Stream group identification (ID)
With synchronous margin IE；And
Transmitter, is configured to transmit described message.
24. according to the WTRU described in embodiment 23, and wherein said message is transmission request between WTRU
Message or stream increase request message.
25. according to the WTRU described in embodiment 23, and wherein said message is that session updates asks message.
Although be described above feature and the element using particular combination, but ordinary skill
Personnel were it is to be understood that each feature both can be used alone, it is also possible to carry out with other features and element
Any combination.Additionally, method described herein can be by computer in being incorporated into computer-readable medium
Or computer program, software or the firmware of processor execution is implemented.Showing about computer-readable medium
Example includes the signal of telecommunication (launching via wired or wireless connection) and computer-readable recording medium.About
The example of computer-readable recording medium is including, but not limited to read only memory (ROM), random access memory
Memorizer (RAM), depositor, buffer storage, semiconductor memory apparatus, such as internal hard drive and
The magnetizing mediums of moveable magnetic disc etc, magnet-optical medium and such as CD-ROM video disc and the many merits of numeral
The light medium of energy CD (DVD) etc.The processor being associated with software may be used for being implemented in
The RF transceiver used in WTRU, UE, terminal, base station, RNC or any master computer.
Claims (14)
1. for the method synchronizing the Media Stream of multiple wireless transmitter/receiver unit WTRU, the party
Method includes:
A WTRU in described WTRU transmits the first message, when this first message includes initial
Between synchronizing information and perform the request of operation on described Media Stream, wherein said initial time synchronized letter
Difference between breath instruction current playback time and current time stamp, to guarantee to occur for described WTRU
The playback synchronized, and the time of the fragment that described current time stamp is the beginning relative to media presentation
Stamp；
The 2nd WTRU in described WTRU receives the second message, and this second message is included in described matchmaker
The request of described operation and the time synchronization information of renewal is performed on body stream；And
Described 2nd WTRU according to the time synchronization information of described renewal come re-synchronization this second
The Media Stream of WTRU, the re-synchronization of wherein said 2nd WTRU updates the synchronization of described Media Stream
To provide the playback of the synchronization for the WTRU in described WTRU and described 2nd WTRU.
Method the most according to claim 1, the method also includes:
Described 2nd WTRU transmit the 3rd message, the 3rd message include for re-synchronization this second
The time synchronization information of the described renewal of the Media Stream of WTRU；
A described WTRU receives the 4th message, and the 4th message includes the time synchronized of described renewal
Information；And
A described WTRU utilizes the time synchronization information of described renewal to update a WTRU's
Internal state.
In method the most according to claim 2, wherein said first message and described second message
Each includes Session Description Protocol SDP property column.
Method the most according to claim 1, wherein said operation is transmission operation between WTRU.
Method the most according to claim 1, wherein said Media Stream includes video flowing and audio stream.
Method the most according to claim 1, wherein said first message is that between WTRU, transmission please
Message or stream is asked to increase request message.
Method the most according to claim 1, wherein said second message is that between WTRU, transmission rings
Message or stream is answered to increase request message.
8. for synchronizing a device for the Media Stream of multiple wireless transmitter/receiver unit WTRU, this dress
Put and include:
Transmitter, is configured to transmit the first message, and this first message includes initial time synchronization information
With on described Media Stream, perform the request of operation, wherein said initial time synchronization information instruction is current
Difference between playback duration and current time stamp, to guarantee for the plurality of wireless transmitter/receiver unit
There is the playback synchronized, and the sheet that described current time stamp is the beginning relative to media presentation in WTRU
The timestamp of section；
Receiver, is configured to receive the second message, and this second message includes by described WTRU
One WTRU makes the time synchronization information of the renewal of the Media Stream for this WTRU of re-synchronization；With
And
Processor, is configured to use the time synchronization information of described renewal to update the interior of a WTRU
Portion's state, the re-synchronization of a WTRU in wherein said WTRU update described WTRU it
Between synchronization.
In device the most according to claim 8, wherein said first message and described second message
Each includes Session Description Protocol SDP property column.
Device the most according to claim 8, wherein said operation is transmission operation between WTRU.
11. devices according to claim 8, wherein said first message is that between WTRU, transmission please
Message or stream is asked to increase request message.
12. devices according to claim 8, wherein said device is that conversation continuity controls application
Server S CC-AS.
13. devices according to claim 8, wherein said first message is that session updates request disappears
Breath or stream increase request message.
14. devices according to claim 8, wherein said device is WTRU.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610979731.4A CN106899569A (en) | 2011-02-11 | 2012-02-09 | Wireless transmitter/receiver unit, method and network equipment |
| CN201610979297.XA CN107104934A (en) | 2011-02-11 | 2012-02-09 | Method and apparatus for the synchronizing moving station Media Stream during coordinated conversational |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201161442008P | 2011-02-11 | 2011-02-11 | |
| US61/442,008 | 2011-02-11 | ||
| PCT/US2012/024439 WO2012109422A1 (en) | 2011-02-11 | 2012-02-09 | Method and apparatus for synchronizing mobile station media flows during a collaborative session |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610979731.4A Division CN106899569A (en) | 2011-02-11 | 2012-02-09 | Wireless transmitter/receiver unit, method and network equipment |
| CN201610979297.XA Division CN107104934A (en) | 2011-02-11 | 2012-02-09 | Method and apparatus for the synchronizing moving station Media Stream during coordinated conversational |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103354992A CN103354992A (en) | 2013-10-16 |
| CN103354992B true CN103354992B (en) | 2016-11-30 |
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| CN1951083A (en) * | 2004-05-07 | 2007-04-18 | 诺基亚公司 | Refined quality feedback in streaming services |
| CN101288257A (en) * | 2005-08-26 | 2008-10-15 | 诺基亚公司 | Method for signaling a device to perform no synchronization or include a synchronization delay on multimedia streams |
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