CN105450382A

CN105450382A - Clock synchronization method and equipment for media play

Info

Publication number: CN105450382A
Application number: CN201410226206.6A
Authority: CN
Inventors: 张清; 马付伟; 许剑峰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-05-26
Filing date: 2014-05-26
Publication date: 2016-03-30

Abstract

The invention provides a clock synchronization method and equipment for media play, and the method comprises the steps: enabling main equipment to receive network information, transmitted by slave equipment, of the slave equipment, and enabling the main equipment and the slave equipment to serve as at least one equipment group according to the network information of the main equipment and the network information of the slave equipment; transmitting the information of the equipment group where the slave equipment belongs and the information of the equipment group where the main equipment belongs to the slave equipment; enabling the main equipment to obtain the reference time information of the main equipment from a downlink channel, wherein the downlink channel is the downlink channel of an access network of the main equipment; enabling the main equipment to transmit the reference time information of the main equipment to all slave equipment, so as to enable the slave equipment, which does not belong to the equipment group where the main equipment belongs, to determine the moment when the slave equipment plays a media content synchronously according to the reference time information of the main equipment, wherein the slave equipment plays the media content synchronously along with the main equipment. The above method can achieve the play synchronization of the media content, and is not affected by signal retransmission and a shielding environment during the play synchronization of the media content.

Description

For clock synchronizing method and the equipment of media play

Technical field

The embodiment of the present invention relates to the communication technology, particularly relates to a kind of clock synchronizing method for media play and equipment.

Background technology

Multiple terminals audio frequency exports and works in coordination with is that a player exports speech waveform data, is sent to multiple terminal simultaneously by bluetooth or WIFI interface and is outputted to loud speaker, forms a kind of multichannel, random loudspeaker array pattern.

Such as, application scenarios one: a pair lover is sitting on the chair of park, and two mobile phones are placed on the both sides of two people, plays graceful stereo music.Application scenarios two: the classmate of several relation iron encloses several the mobile phones stood in a ring with everybody and jointly appreciates stirring pop music, and bass effect is obvious; (5.1 sound channels, 5 channel allocation are on plurality of mobile phones, and all mobile phones complete bass effect).Application scenarios three: each personnel participated in a conference are placed in hand machine when conference terminal uses in face of oneself, formation microphone (microphone is called for short MIC), loudspeaker array.

Time synchronized is the collaborative key play, in prior art, the method for time synchronized has a lot: first: IEEE1588V2 agreement, the timestamp produced when exchanging on the line according to 1588 clock synchronous messages, obtains transmission time information, calculates the compensating delay time of each side; Second: obtain accurate global absolute time by global positioning system (GlobalPositioningSystem is called for short GPS), start the operation of each side by the moment of consulting agreement; 3rd: long-wave time service, ripple is sent out in the timing of time service center, and user utilizes special long wave timing receiver to receive timing signal at the appointed time and realizes time synchronized.

But the first method for synchronizing time above-mentioned is based on upper-layer protocol, and equipment room is exchanged by multiple packets of information, make the synchronization accuracy of equipment room by the impact (as time delay) in information packet switch path, more difficultly reach higher precision; Especially, transfer channel change on the impact of packets of information comparatively greatly (as retransmitted), causing the synchronised clock in equipment group between each equipment inconsistent, making synchronously to play media between each equipment in equipment group; The second method for synchronizing time needs special GPS receiving equipment, and it exists indoor tunnel etc. and hides occasion without defects such as Received signal strength, equipment power dissipation height; Use the method for the second time synchronized must be without covering environment; The third long-wave time service needs special long wave receiving equipment, and can only receive long-wave signal at a fixed time.

Summary of the invention

The embodiment of the present invention provides a kind of clock synchronizing method for media play and equipment, for realizing the synchronous broadcasting of media content, and the time synchronization process that media content is play can not be subject to information packet switch path and cover the impact of environment, simultaneously without the need to arranging special receiving equipment.

First aspect, the embodiment of the present invention provides a kind of clock synchronizing method for media play, comprising:

Main equipment receive to send from equipment described in from the network information of equipment, network corresponding to the described network information provides the described reference time information from device plays media content for described from equipment;

Described main equipment according to the network information of described main equipment and the described network information from equipment by described main equipment, described be at least one equipment group from classification of equipment, in each equipment group, the network of all devices access is identical;

Described main equipment by described send from the equipment group information belonging to equipment and the equipment group information belonging to described main equipment described from equipment;

Described main equipment obtains the reference time information of described main equipment from down channel, and described down channel is the down channel of described main equipment access network;

Described main equipment the reference time information of described main equipment is sent to all described in from equipment, with make with described main equipment not when described in same equipment group from equipment according to the reference time information of described main equipment determine described play media content from device synchronization when.

In conjunction with first aspect, in the implementation that the first is possible, described method also comprises:

Described main equipment is according to the reference time information obtained and describedly play described media content from device synchronization.

In conjunction with first aspect, in the implementation that the second is possible, described main equipment receive to send from equipment described in from before the network information of equipment, described method also comprises:

Described main equipment sends the first message from equipment described in all, and described first message is the described network information providing the reference time information playing media content from equipment for obtaining described from equipment; Described main equipment receives from the network information from equipment described in equipment transmission, comprising: described main equipment receives described from equipment network information from equipment according to described first message transmission.

In conjunction with the implementation that first or the second of first aspect and first aspect are possible, in the implementation that the third is possible, before described main equipment obtains the step of reference time information of described main equipment from down channel, described method also comprises:

Described main equipment is to the start position information sending media content to be played described in all from equipment.

In conjunction with the above-mentioned possible implementation of first aspect and first aspect, in the 4th kind of possible implementation, described main equipment obtains the reference time information of described main equipment from down channel, comprising:

Described main equipment obtains the reference time information of described main equipment from the demodulation module of down channel.

Second aspect, the invention provides a kind of clock synchronizing method for media play, comprising:

Send the described network information from equipment from equipment to main equipment, network corresponding to the described network information provides the described reference time information from device plays media content for described from equipment;

Described from equipment receive described main equipment send described in from the equipment group information belonging to equipment and the equipment group information belonging to described main equipment;

Describedly from down channel, obtain the described reference time information from equipment from equipment, described down channel is the described down channel from equipment access network;

The described reference time information receiving the described main equipment that described main equipment sends from equipment, the reference time information of described main equipment is that described main equipment obtains from the down channel of described main equipment access network;

Described different from the equipment group information belonging to described main equipment from the equipment group information belonging to equipment time, describedly determine described moment of from device synchronization playing media content according to described from the reference time information of equipment and the reference time information of described main equipment from equipment.

In conjunction with second aspect, in the implementation that the first is possible, described send the described step from the network information of equipment from equipment to main equipment before, described method also comprises:

Describedly receive from equipment the first message that described main equipment sends, described first message for being the described network information providing the reference time information playing media content from equipment for obtaining described from equipment;

The described network information from equipment to main equipment from equipment described in transmission, comprising:

Describedly send the described network information from equipment according to described first message to described main equipment from equipment.

In conjunction with the first possible implementation of second aspect or second aspect, in the implementation that the second is possible, described receive the step of the reference time information of the main equipment that main equipment sends from equipment before, also comprise:

The described start position information receiving the media content to be played that described main equipment sends from equipment.

In conjunction with the above-mentioned possible implementation of second aspect or second aspect, in the implementation that the third is possible, describedly from down channel, obtain the described reference time information from equipment from equipment, comprising:

The described reference time information from equipment is obtained the described demodulation module from equipment from down channel.

The third aspect, the invention provides a kind of communication equipment, comprising:

Demodulation module, processing unit and playing module;

Wherein, described processing unit is connected with described demodulation module, described playing module respectively;

Clock signal in the down channel of described demodulation module obtaining communication equipment access network, and by interrupt signal, clock signal is inputted described processing unit, to make described processing unit obtain reference time information from described clock signal, described down channel is the down channel of described communication equipment access network;

Described playing module adopts the reference time information in described processing unit to play media content.

Fourth aspect, the invention provides a kind of communication equipment, comprising:

Receiving element, for receive another communication equipment send described in the network information of another communication equipment, network corresponding to the described network information provides another communication equipment described to play the reference time information of media content for another communication equipment described;

Equipment group division unit, for described communication equipment, another communication equipment described being divided at least one equipment group according to the network information of communication equipment and the network information of another communication equipment described, in each equipment group, the networking of all devices access is identical;

Transmitting element, for sending another communication equipment described by the equipment group information belonging to another communication equipment described and the equipment group information belonging to described communication equipment;

Reference time information acquisition unit, for obtaining the reference time information of described communication equipment from down channel, described down channel is the down channel of described communication equipment access network;

Described transmitting element, also for the reference time information of described communication equipment is sent to all described in another communication equipment, to make with described communication equipment not when according to the reference time information of described communication equipment, another communication equipment described in same equipment group determines that another communication equipment described synchronously plays media content.

In conjunction with fourth aspect, in the implementation that the first is possible, described equipment also comprises:

Synchronous broadcast unit, for synchronously playing described media content according to reference time information and another communication equipment described of obtaining.

In conjunction with fourth aspect, in the implementation that the second is possible, described transmitting element, also for

Receive the network information of another communication equipment at described receiving element before, send the first message to all another communication equipments described, described first message is for obtaining the network information of the reference time information providing media play content in another communication equipment described for another communication equipment described;

Described receiving element, specifically for receiving the network information of another communication equipment described another communication equipment according to described first message transmission.

In conjunction with the above-mentioned possible implementation of fourth aspect or fourth aspect, in the implementation that the third is possible, described transmitting element, also for

Before described reference time information acquisition unit obtains described reference time information, send the start position information of media content to be played to another communication equipment described in all.

In conjunction with the above-mentioned possible implementation of fourth aspect or fourth aspect, in the 4th kind of possible implementation, described reference time information acquisition unit, specifically for

The reference time information of described communication equipment is obtained from the demodulation module of down channel.

5th aspect, the invention provides a kind of communication equipment, comprising:

Transmitting element, for sending the network information of communication equipment to another communication equipment, network corresponding to the described network information provides described communication equipment to play the reference time information of media content for described communication equipment;

Receiving element, for receiving the equipment group information belonging to described communication equipment that another communication equipment described sends and the equipment group information belonging to another communication equipment described;

Described receiving element, also for after getting described reference time information in described reference time information acquisition unit, receive the reference time information of another communication equipment described that another communication equipment described sends, the reference time information of another communication equipment described is that another communication equipment described obtains from the down channel of another communication equipment access network described;

Synchronization point determining unit, for when the equipment group information belonging to the described communication equipment that described receiving element receives is different from the equipment group information belonging to another communication equipment described, determine that the moment of media content synchronously play by described communication equipment according to the reference time information of described communication equipment and the reference time information of another communication equipment described.

In conjunction with the 5th aspect, in the implementation that the first is possible, described receiving element, also for

Send the network information of described communication equipment at described transmitting element before, receive the first message that another communication equipment described sends, described first message is the network information for obtaining the reference time information providing broadcasting media content in another communication equipment described for another communication equipment described;

Described transmitting element, specifically for

Send the network information of another communication equipment described to another communication equipment described according to described first message.

In conjunction with the first possible implementation of the 5th aspect or the 5th aspect, in the implementation that the second is possible, described receiving element also for

Before receiving the reference time information of another communication equipment described that another communication equipment sends, receive the start position information of the media content to be played that another communication equipment described sends.

In conjunction with the above-mentioned possible implementation of the 5th aspect or the 5th aspect, in the implementation that the third is possible, described reference time information acquisition unit, specifically for

As shown from the above technical solution, the clock synchronizing method for media play of the embodiment of the present invention and equipment, the network information sent from equipment is received by main equipment, according to networking information by main equipment, from classification of equipment equipment group, and by main equipment corresponding device group information with send to from equipment from equipment corresponding device group information, and then main equipment obtains the reference time information of main equipment from down channel, and then the reference time information of main equipment is sent from equipment, when to make to determine not determine to play media content from device synchronization according to the reference time information of main equipment when an equipment from equipment and main equipment from equipment, and then can realize the synchronous broadcasting of media content, and the time synchronization process that media content is play can not be subject to information packet switch path and cover the impact of environment, simultaneously without the need to arranging special receiving equipment.

Accompanying drawing explanation

The flow chart of the clock synchronizing method for media play that Fig. 1 provides for one embodiment of the invention;

The flow chart of the clock synchronizing method for media play that Fig. 2 provides for another embodiment of the present invention;

The flow chart of the clock synchronizing method for media play that Fig. 3 A provides for another embodiment of the present invention;

Fig. 3 B is the schematic diagram of the synchronous reference time information that in one embodiment of the invention, multiple equipment obtains from respective access network;

Fig. 3 C is the schematic diagram determining the reference time information from equipment in one embodiment of the invention from equipment;

The flow chart of the clock synchronizing method for media play that Fig. 4 provides for another embodiment of the present invention;

The flow chart of the clock synchronizing method for media play that Fig. 5 provides for another embodiment of the present invention;

Fig. 6 A is the schematic diagram extracting reference time information in one embodiment of the invention from radio frames;

Fig. 6 B is the frame structure schematic diagram that in LTE network, TDD and FDD is corresponding respectively;

Fig. 7 is the enlarged diagram of special time slot in TDD in LTE network;

Fig. 8 is the schematic diagram of frame structure in LTE network;

Fig. 9 A is the schematic diagram of synchronizing channel in WCDMA system;

Fig. 9 B is the schematic diagram of synchronizing channel and primary pilot channel in WCDMA system;

The schematic diagram of cell search process when Fig. 9 C is mobile device start in WCDMA system;

Figure 10 is the schematic diagram of synchronous channel structure in IS95/CDMA2000 system;

Figure 11 is the schematic diagram of frame structure in gsm system;

The structural representation of the communication equipment that Figure 12 provides for one embodiment of the invention;

The structural representation of the communication equipment that Figure 13 to Figure 16 provides for another embodiment of the present invention.

Embodiment

Current, there is the grouping self-organization network of control centre, group head or master can be applied to become, can aggressive mode be had, invite other user to add, manage the group that has multiple member.Group head is free to allow adding of member, exits play content (left and right acoustic channels) and switches.Usually, media content is sliced into the packet of a few tens of milliseconds by organizing head, and Master sends beacon, plays media and shares between devices.But synchronous media of playing need to play timing synchronization, and how synchronously the broadcasting moment becomes the current problem needing to solve.

Group head in the embodiment of the present invention is main equipment, and member has multiple from equipment, realize main equipment and between equipment synchronous play media moment and reference time information consistent.

Fig. 1 shows the flow chart of the clock synchronizing method for media play that one embodiment of the invention provides, and as shown in Figure 1, the clock synchronizing method for media play in the present embodiment is as described below.

101, main equipment receive to send from equipment described in from the network information of equipment, network corresponding to the described network information provides the described reference time information from device plays media content for described from equipment;

102, main equipment according to the network information of described main equipment and the described network information from equipment by described main equipment, described be at least one equipment group from classification of equipment, in each equipment group, the network of all devices access is identical;

103, main equipment by described send from the equipment group information belonging to equipment and the equipment group information belonging to described main equipment described from equipment;

104, main equipment obtains the reference time information of described main equipment from down channel, and described down channel is the down channel of described main equipment access network;

For example, down channel can be: downlink network synchronizing channel, downlink pilot frequency channel or downstream data channel etc.

The reference time information of described main equipment can be: the temporal information of radio frames in downlink network synchronizing channel, the temporal information of subframe in described downlink pilot frequency channel, or, the temporal information etc. of time slot in described downstream data channel.

From hardware view, the clock signal that main equipment can export from the demodulation module of the down channel of main equipment access network, obtain the reference time information of described main equipment.

In addition, the wireless network that main equipment can access can be global system for mobile communications (GlobalSystemForMobileCommunications, be called for short GSM), universal mobile telecommunications system (UniversalMobileTelecommunicationsSystem, be called for short UMTS), Long Term Evolution (LongTermEvolution, be called for short LTE), WLAN (wireless local area network) (WirelessLAN, be called for short WLAN) etc.

105, main equipment the reference time information of described main equipment is sent to all described in from equipment, with make with described main equipment not when described in same equipment group from equipment according to the reference time information of described main equipment determine described play media content from device synchronization when.

Can be from equipment the equipment synchronously playing media content with main equipment in the present embodiment.Wherein main equipment can be group head, and ALARA Principle has multiple equipment group from equipment.From the member that equipment is in equipment group, main equipment and from equipment collaboration play multimedia.That is, main equipment can be the group head synchronously playing media content, and this main equipment is free to allow adding from equipment, exits play content (left and right acoustic channels) and switches.

It should be noted that, also need the down channel from equipment access network, extract the reference time information from equipment from equipment, and then when not belonging to same equipment group from equipment and main equipment, reference time information according to main equipment, the reference time information from equipment determine the moment of playing media content from device synchronization, and Fig. 3 C as hereafter illustrates the process determining the moment of playing media content from device synchronization from equipment.

For example, the scene of said method application can be: wedding ceremony occasion, and part of cell phone plays wedding march, and love popular song etc. play by another part mobile phone, and the sound etc. of live host play by some mobile phone possible.Above-mentioned scene can be similar to the (instrumental) ensemble effect of concert.The role of main equipment performer commander under this scene, be responsible for the foundation of implementing tree-like radio network, and also to implement the task management (such as, playing media content, group member's distribution, reproduction time list, volume adjusting etc. between each group in group) of group head in subset group.

It should be noted that and synchronous play the broadcasting being not limited to identical content, can the designing user media content of wishing etc.

For LTE network, operable reference time information comprises: time slot (0.5ms), subframe (1ms), radio frames (10ms) etc.The initial time of these Resource Units (i.e. time slot, subframe, radio frames) in each cell is all determined, thus, each equipment in equipment group can using the initial time of time slot, subframe or radio frames as reference temporal information.

The clock synchronizing method for media play in the present embodiment, from down channel, the reference time information of main equipment is obtained by main equipment, and then the reference time information of main equipment is sent from equipment, to make the moment of determining to play from device synchronization media content from equipment according to the reference time information of main equipment; And then can realize the synchronous broadcasting of media content, and the time synchronization process that media content is play can not by information packet switch path and the impact of covering environment.

In a particular application, before above-mentioned steps 104, said method also can comprise following step 104a, as shown in Figure 2.

104a, main equipment are to all start position informations sending media content to be played from equipment.

That is, all needs from equipment the start position information knowing media content to be played, and then can realize playing media content with main equipment at the timing synchronization determined.

Alternatively, in a particular application, said method also can comprise following step 106, as shown in Figure 2.

106, described main equipment is according to the reference time information of described main equipment and describedly play media content from device synchronization.

In above-described embodiment, the access network of main equipment is wireless network, and synchronously have the advantage covering wide, few blind area from wireless network extraction time, most of User Activity region has network signal to cover, and the network coverage almost overlaps completely with consumer entertainment trend.Terminal media play and gather synchronous on, wireless network is not masked the impact of environment, has covering advantage than GPS.

Fig. 3 A shows the flow chart of the clock synchronizing method for media play that one embodiment of the invention provides, and as shown in Figure 3A, the clock synchronizing method for media play in the present embodiment is as described below.

301, main equipment sends the first message from equipment described in all, and described first message is the described network information providing the reference time information playing media content from equipment for obtaining described from equipment;

302, main equipment receives described from equipment network information from equipment according to described first message transmission.

The network information at this place can be network corresponding to the described network information provides the described reference time information from device plays media content for described from equipment.

Network corresponding to networking information can be China Telecom, China Mobile, CHINAUNICOM etc.

303, main equipment according to the network information of described main equipment and the described network information from equipment by described main equipment, described be at least one equipment group from classification of equipment, in each equipment group, the network of all devices access is identical.

Such as, code division multiple access (the CodeDivisionMultipleAccess of China Telecom, being called for short CDMA) mobile phone can be an equipment group, Wideband-CDMA (the WidebandCodeDivisionMultipleAccess of UNICOM, being called for short WCDMA) mobile phone can be an equipment group, CDMA (Code Division Multiple Access) (the TimeDivision-SynchronousCodeDivisionMultipleAccess of the time division synchronous of movement, be called for short TDSCDMA mobile phone and can be an equipment group, timesharing Long Term Evolution (the TimeDivisionLongTermEvolution of movement, being called for short TD-LTE) mobile phone can an equipment group, multiple equipment group can work in coordination with broadcasting together.

304, main equipment by described send from the equipment group information belonging to equipment and the equipment group information belonging to described main equipment described from equipment.

It should be noted that usually, main equipment and all can not an equipment group from equipment, thus, main equipment needs the equipment group information belonging to main equipment and sends to from the equipment group information belonging to equipment all from equipment.

In a particular application, if main equipment and all belong to an equipment group from equipment, now, main equipment can not send from the equipment group information belonging to equipment and the equipment group information belonging to described main equipment from equipment.Certainly, this can be selected according to actual needs, and the present embodiment is only and illustrates.

305, main equipment obtains the reference time information of described main equipment from the down channel of main equipment, and the down channel at this place is the down channel of described main equipment access network;

All obtains the described reference time information from equipment from equipment from respective down channel, and the down channel at this place is the down channel from equipment access network.

For example, described main equipment/can be from the reference time information of equipment: the temporal information of radio frames downlink network synchronizing channel, the temporal information of subframe in described downlink pilot frequency channel, or, the temporal information etc. of time slot in described downstream data channel.

It should be noted that main equipment and obtain reference time information from respective down channel respectively from equipment, do not need main equipment to trigger and obtain reference time information etc. from equipment.

306, the reference time information of described main equipment is sent to from equipment by main equipment.

In concrete application, main equipment the reference time information of main equipment can be sent to main equipment not an equipment group from equipment, can be all from equipment without the need to sending.

When 307, determining different with the equipment group information belonging to main equipment from the equipment group information belonging to equipment from equipment, the described moment of playing media content from device synchronization can be determined according to the reference time information of described main equipment, the described reference time information from equipment.

In the present embodiment, from equipment be the equipment synchronously playing media content with described main equipment.

It will be appreciated that, the initial time difference that each equipment receives is that each equipment distance sends the delay inequality of the Electromagnetic Wave Propagation of eating dishes without rice or wine that base station distance difference causes, for 100 scopes, maximum delay variation is 100m/300000km=0.33us, meets synchronous time precision requirement of playing completely.

In the present embodiment, the standby moment of network communication is not used at arbitrary equipment, the call signaling that arbitrary equipment also will monitor common broadcast channel starts business to prepare access network at any time, so do not need to keep separately network insertion state to obtain synchronization point and battery power consumption and network insertion expense in waste equipment, and then the energy consumption of equipment can be reduced.

In addition, the clock synchronizing method in the present embodiment passes through wireless network extraction time reference, as the benchmark of time synchronized operation.Substantially overlap with equipment (main equipment and from equipment) scope of activities because wireless network covers, therefore relative to prior art, this clock synchronizing method does not retransmit by signal and covers the impact of environment, meets the time synchronized demand of collaborative multimedia preferably.Further, above-mentioned clock synchronizing method does not also need to arrange special receiving equipment.

In the optional application scenarios of one, as above in the method shown in Fig. 3 A, before step 301, said method also can comprise not shown step 300:

300, main equipment sends the first message from equipment described in all, and described first message is the described network information providing the reference time information playing media content from equipment for obtaining described from equipment;

Correspondingly, above-mentioned step 301 can be specially following content:

Main equipment receives described from equipment network information from equipment according to described first message transmission.

Be understandable that, in the present embodiment, obtain in above-mentioned steps 305 reference time information can concrete example as follows: arbitrary equipment can extract the reference time information of this equipment from wireless network down channel, such as: extract from downlink network synchronizing channel, or, extract from downlink pilot frequency channel, or, extract from downstream data channel.

Such as, when in arbitrary equipment, no user identification module (SubscriberIdentityModule is called for short SIM) blocks, this equipment frequency sweep can search out the strongest down channel, follows the tracks of synchronizing channel parameter, and then obtains reference time information; Or arbitrary equipment is when having SIM card and be in holding state, and this equipment can extract reference time information from common signal channel paging channel; Or, when arbitrary equipment is in and eats dishes without rice or wine downlink data receiving state, extract reference time information from descending time slot.

In said method, each needs to consult unification between synchronous equipment (as main equipment with from equipment) and chooses a kind of synchronization parameter (as radio frames, subframe or time slot etc.) extracting mode;

Collaborative multimedia comprises the step of following citing from network extraction reference time information:

The network of A01, selective extraction reference time information, the information that the equipment participating in cooperation service has heterogeneous networks to access, if main equipment and can select to access same wireless network from equipment, then can obtain consistent reference time information, can be directly used in and collaborative play media content;

If A02 main equipment and from equipment can not consult access consolidated network, then participate in collaborative extracting respective reference time information separately from equipment, and then determine this reference time information from 10ms or the 20ms interval of equipment oneself according to the reference time information of main equipment.Flow process as shown in Figure 3A.

Fig. 3 B to show in the embodiment of the present invention schematic diagram of the synchronous reference time information that four equipment obtain from respective access network, and wherein, equipment 01, equipment 02, equipment 03 access the base station of consolidated network, and equipment 04 accesses the base station of another network.The reference time Complete Synchronization of equipment 01,02, the two exchange by the information of network insertion can confirm that their reference time is completely the same.

Such as, if the reference time is all starting position or the 5ms subframe position of taking from the descending 10ms radio frames of same wireless network, then the reference time is consistent;

Again such as one what get is the 10ms reference time, one is the 1ms reference time, then inconsistent; Need the time location changing the wireless channel obtaining the reference time, reference time and the reference time of equipment 01, equipment 02 of equipment 03 take from the different subframe/time slot positions of consolidated network base station, it is all 10ms reference, an initial time position of taking from radio frames, another takes from the position of the 5th subframe of 10ms frame, and the exchange also by the network information learns with the time delay of equipment 01, equipment 02 it is 5 subframe position and 50ms; The reference time of equipment 04, may not there is any incidence relation determined in the reference time of two networks, can only be obtained by measurement from another network.

It should be noted that the mode of Measuring Time difference can be existing mode, the present embodiment does not describe in detail it.In collaborative above-mentioned Fig. 3 B, equipment 04 is from equipment, when equipment 01 is main equipment, the relative time error of the 10ms reference time between equipment 04 and equipment 01, equipment 02, equipment 03, can refer to shown in Fig. 3 C, the reference time information adjusting oneself from the mode of equipment 04 according to Fig. 3 C obtains the 10ms reference time of aliging, the time difference (following time error) that overall for original reference time Time delay measurement backward goes out.

For example, access consolidated network from equipment 02 and equipment 01, therefore the temporal information extracted from respective down channel is identical; The network accessed from equipment 04 is different from the network that equipment 01 accesses, therefore illustrates equipment 04 below how according to the Delay of the reference time information determination equipment 04 of main equipment 01.

Equipment 04 determines the process of time difference:

(1) equipment 01 sends a packet comprising temporal information (12: 35: 18 430ms) to equipment 04 at first start time position of the 10ms time reference of Fig. 3 B equipment 01;

(2) equipment 04 receives the time of the packet of equipment 01 is 12: 35: 18 431.5ms, compared with the time (12: 35: 18 430ms) in the packet received, this time packet from equipment 01 to the transmission delay of equipment 04 be 1.5ms;

(3) second start time position of equipment 04 10ms time reference is in figure 3b replied one and is comprised its packet of time (12: 35: 18 431.5ms) sending packet time information (12: 35: 18 440ms) and receive equipment 01 packet to equipment 01;

(4) equipment 01 receives the time that equipment 04 replys packet is 12: 35: 18 445.6ms, compared with the time (12: 35: 18 440ms) sending packet with equipment 04 in the packet received, this time reply packet from equipment 04 to the transmission delay of equipment 01 be 5.6ms, from time (the 12: 35: 18 431.5ms) equipment 01 of replying equipment 04 packet and receive equipment 01 packet also obtain from equipment 01 to the propagation delay time of equipment 04 be 1.5ms;

(5) suppose that equipment difference does not affect the delivery time of packet, the moment (12: 35: 18 430ms) starting to send packet at equipment 01 can be extrapolated, the time of equipment 04 is between 12: 35: 18 427.5ms ~ 12 o'clock 35 minutes 18 seconds 438.5ms, equipment 04 in the time error scope of equipment 01 be [-2.5ms ,-1.5ms];

(6) above step 1 ~ 5 are repeatedly repeated, the random value [-2.5ms of time error scope can be obtained,-1.5ms], [-2.45ms,-1.55ms], [-2.3ms,-1.2ms] ..., calculate the mean value of these scope central values, when pendulous frequency is abundant, mean value is-2, and devices illustrated 04 is-2ms with the time reference error of equipment 01.

By upper, equipment 04 obtain with the time reference error of main equipment after, equipment 04 can introduce cooperation service handling process as synchronous base using the 10ms reference time by the hardware interrupts of equipment 04 inside, software timer mode.Certainly, equipment 03 also obtains the time reference error with main equipment by aforesaid way.

Such as, in a slave device, 10ms reference time signal in the down channel of wireless network is input to the interrupt pin of processor, processor opens this interrupt pin and trigger software timer, the weaken rock that software timer produces can be used for triggering, starting collaborative broadcasting media content, and then realizing consistent with the moment that main equipment plays media content from the moment of device plays media content, namely above-mentioned equipment 01 to equipment 04 synchronously can play media content.

The process of multiple equipment group can be divided into according to access network difference for the clock synchronizing method of media play in the present embodiment, take into account the diversity of existing equipment, between equipment group, each device synchronization is for measuring difference lock in time of heterogeneous networks, multiple equipment room repetitive measurement and programmable single-chip system actual difference, can eliminate random synchronism time error of the prior art completely, and then the lock in time making wireless network in the present embodiment extract media play has higher precision.

Fig. 4 shows the flow chart of the clock synchronizing method for media play that one embodiment of the invention provides, and as shown in Figure 4, the clock synchronizing method for media play in the present embodiment is as described below.

401, send the described network information from equipment from equipment to main equipment, network corresponding to the described network information provides the described reference time information from device plays media content for described from equipment;

402, receive described in the transmission of described main equipment from the equipment group information belonging to equipment and the equipment group information belonging to described main equipment from equipment;

403, from down channel, obtain the described reference time information from equipment from equipment, described down channel is the described down channel from equipment access network;

For example, down channel can be downlink network synchronizing channel, downlink pilot frequency channel, or downstream data channel etc.

In addition, in a particular application, describedly the described reference time information from equipment can be obtained from equipment from the demodulation module of down channel.

404, receive the reference time information of the described main equipment that described main equipment sends from equipment, the reference time information of described main equipment is that described main equipment obtains from the down channel of described main equipment access network;

For example, the one following information is comprised from the reference time information of equipment:

The temporal information of radio frames in described downlink network synchronizing channel, the temporal information of subframe in described downlink pilot frequency channel, or, the temporal information of time slot in described downstream data channel.

From hardware view, from the demodulation module of the down channel of the wireless network oneself accessed, obtain the described reference time information from equipment from equipment.

405, described different from the equipment group information belonging to described main equipment from the equipment group information belonging to equipment time, describedly determine described moment of from device synchronization playing media content according to described from the reference time information of equipment and the reference time information of described main equipment from equipment.

Alternatively, said method also can comprise following not shown step 406:

406, synchronously described media content is play described from the moment that equipment is determined and described main equipment from equipment.Now, the reference time information determined according to main equipment of main equipment with play described media content from device synchronization.

In the present embodiment, described is the equipment synchronously playing media content with described main equipment from equipment.That is, main equipment can be the group head synchronously playing media content, and ALARA Principle has multiple equipment group from equipment.

In a particular application, before above-mentioned steps 4, said method also can comprise following not shown step 403a.

403a, to receive the start position information of the media content to be played that described main equipment sends from equipment.

It should be noted that step 403a and step 403 can not distinguish the relation of execution sequence.

The clock synchronizing method for media play of the present embodiment can realize main equipment and play media content from device synchronization, does not retransmit and covers the impact of environment when playing media content simultaneously by signal.

Fig. 5 shows the flow chart of the clock synchronizing method for media play that another embodiment of the present invention provides, and as shown in Figure 5, the clock synchronizing method for media play in the present embodiment is as described below.

501, receive from equipment the first message that described main equipment sends, described first message for being the described network information providing the reference time information playing media content from equipment for obtaining described from equipment.

502, the described network information from equipment is sent according to described first message to described main equipment from equipment, network corresponding to the described network information provides the described reference time information from device plays media content for described from equipment, with make described main equipment according to the network information of the described network information from equipment and described main equipment by described main equipment, described from classification of equipment at least one equipment group, the access network of all devices in each equipment group is identical.

503, receive described in the transmission of described main equipment from the equipment group information belonging to equipment and the equipment group information belonging to described main equipment from equipment.

504, from down channel, obtain the described reference time information from equipment from equipment, described down channel is the described down channel from equipment access network.

505, the described reference time information receiving the described main equipment that described main equipment sends from equipment, the reference time information of described main equipment is that described main equipment obtains from the down channel of described main equipment access network;

506, described different from the equipment group information belonging to described main equipment from the equipment group information belonging to equipment time, describedly determine described moment of from device synchronization playing media content according to described from the reference time information of equipment and the reference time information of described main equipment from equipment.

In the present embodiment, can extract from the reference time information of equipment from wireless network down channel from equipment, such as: extract from downlink network synchronizing channel, or, extract from downlink pilot frequency channel, or, extract from downstream data channel.

Such as, time from equipment without SIM card, frequency sweep can search out the strongest down channel from equipment, follow the tracks of synchronizing channel parameter; Or, from equipment when having SIM card and be in holding state, the reference time can be extracted from common signal channel paging channel from equipment; Or, from equipment be in eat dishes without rice or wine downlink data receiving state time, from descending time slot extract the reference time.

The process of multiple equipment group can be divided into according to access network difference for the clock synchronizing method of media play in the present embodiment, take into account the diversity of existing equipment; In addition, the clock synchronizing method for media play of the present embodiment can to realize in multiple equipment group main equipment and play media content from device synchronization, by information packet switch path and the impact of covering environment simultaneously when playing media content.

In the various embodiments described above main equipment and from equipment use access network the clock signal of down channel as with reference to the time, Fig. 6 A shows an equipment in the embodiment of the present invention from radio frames, extracts the schematic diagram of reference time information, in fig. 6, equipment extracts clock signal from the radio frames of down channel, and then obtains reference time information according to clock signal.Giving the reference time that the cycle is 5ms, 10ms in Fig. 6 A, aligns with initial, the center of radio frames respectively in the position of the reference time of two 10ms.

Particularly, above figure LTE network is example, introduce the process obtaining reference time information in LTE network: equipment demodulation module (modem module) in network insertion process catch main auxiliary synchronous signals, determine the border of subframe (subframe), determine the original position of 10ms radio frames further, these process are all the functions of existing modem module, the border of drawing these 10ms radio frames from modem module can make the processor of equipment produce reference time information, such as, the centre position of 10ms frame, the border of the even a certain subframe in border of 5ms frame can extract the original position as the time cycle in reference time information from modem module.

Thus, need draw these clock signals from demodulation module and be input to processor interrupt pin at hardware view, when the hardware interrupts of processor is triggered, the code execution of processor can jump to the one section interrupt routine code corresponding with hardware interrupts, this section of code can be the weaken rock starting playing module, also can be directly call playing module.

Playing module makes the hard Interrupt driver program of purpose processor carry out synchronous played data I/O operation; On this basis Geng great chronomere (100ms, 1s, 10s, 100s) time adjustment need use the operating system time (main equipment send reference time information (i.e. school clock time) make each from equipment time consistency, only be synchronized to level second), the main equipment positional information of only issuing played data in normal control procedure in all devices group from equipment.

Main equipment in the present embodiment and all can be mobile device from equipment, in mobile communication system application, arbitrary mobile device must search a suitable community (the prominent community as recorded from radio frequency connector end) as early as possible after starting shooting, what then reach in time slot and frequency with this community is synchronous, could obtain the details of this community.Mobile device only could use the service of network after signing in community.Usually to search the procedure definition signing in suitable cell be initial cell search (initialcellsearch) process from start, cell initial search is called for short.Thus, each equipment can select suitable network to communicate.

All need to obtain respective reference time information from the down channel of respective access network due to main equipment with from equipment, therefore the information such as frame structure/time slot of each network in brief description LTE network, WCDMA system or GSM network below.

If the first main equipment or be LTE network from equipment access

LTE network Frequency Division Duplexing (FDD) (FrequencyDivisionDuplexing is called for short FDD) adopts frequency up, descending to distinguish, and its unidirectional resource is continuous print in time; LTE network time division duplex (TimeDivisionDuplexing; be called for short TDD) the employing time distinguishes up, descending; its unidirectional resource is discontinuous in time, and needs guard time interval to disturb to avoid the transmitting-receiving between both direction.

LTE is respectively FDD and TDD and devises respective wireless frame structure, and as shown in Figure 6B, type (Type) 1 is for the working method of FDD, and type (Type) 2 is for the working method of TDD.In the FDD that Type1 is corresponding, the radio frames of 10ms is divided into 10 length to be that the time slot (slot) that the subframe of 1ms (Subframe), each Subframe are 0.5ms by two length forms.

In the TDD that Type2 is corresponding, the field (Half-Frame) that the radio frames of 10ms is 5ms by two length forms, the subframe (Subframe) that each Half-Frame is 1ms by 5 length forms, and wherein has Subframe and 1 the special Subframe that 4 common.Common Subframe is made up of the slot of two 0.5ms; special Subframe by 3 special time slots by uplink pilot time slot (UplinkPilotTimeSlot; be called for short UpPTS), descending pilot frequency time slot (DownlinkPilotTimeSlot; be called for short DwPTS), protection time slot (GuardPeriod; be called for short GP) composition, as shown in Figure 7.

In LTE, the most significant difference of TDD and FDD frame structure is: the special subframe (Subframe) that there is 1ms in tdd frame structure; this subframe is made up of three special time slots: DwPTS; GP and UpPTS; its implication and function and TD-SCDMA system similar; wherein DwPTS is all the time for descending transmission; UpPTS is all the time for up transmission, and GP is as the guard time interval coming downwards to up conversion in TDD.

In addition, the synchronizing channel for Cell searching in LTE comprises " master sync signal " and " auxiliary synchronous signals ".As shown in Figure 8, in two kinds of wireless frame structures, synchronizing signal has different positions: two synchronizing signals link together in fdd, is positioned at the centre position of subframe 0 and 5; And in TDD, auxiliary synchronous signals is positioned at the end of subframe 0, master sync signal is positioned at special subframe, i.e. the 3rd symbol of DwPTS.

Like this, in two kinds of wireless frame structures, the absolute position of synchronizing signal in radio frames is not identical, what is more important, the relative position of main and auxiliary synchronizing signal is different: two signals link together in fdd, and have the time interval of two symbols between two signals in TDD.Due to synchronizing signal be terminal carry out Cell searching time the signal that detects at first, the design of relative positions different like this makes the duplex mode of main device/just can detect in the most incipient stage of access network from equipment network, i.e. FDD or TDD.

If the second main equipment or be WCDMA system from equipment access

Physical layer timing and synchronizing process: base station down Primary Common Control Physical Channel (PrimaryCommonControlPhysicalCHannel, be called for short P-CCPCH) beginning 256 chips of time slot for providing the transmitting of synchronizing channel, as shown in Figure 9 A.

Supplemental Channel (SupplementalChannel, be called for short SCH) be synchronizing channel, do not carry out spread spectrum and scrambling, it comprises primary synchronization channel (P-SCH) and auxiliary synchronization channel (S-SCH) two subchannel parallel in time, and sends front 256 chips (chips) of each time slot are upper.P-SCH channel is used for the first step in Cell searching, slot synchronization; S-SCH channel is used for second step, frame synchronization and code group identification in Cell searching.

Cell synchronous searching algorithm after mobile device start mainly comprises three steps, as shown in Figure 9 B: 1. pair primary synchronization channel (P-SCH) is caught, and determines boundary of time slot; 2. at each boundary of time slot place, auxiliary synchronization channel (S-SCH) is caught, determine main scrambler group and radio frame boundaries; 3. at radio frame boundaries place, Common Pilot Channel (CPICH) is searched for, determine main scrambler correct in main scrambler group, i.e. base station identity code.The initial algorithm employing serial search that three steps are synchronous, computational complexity is very large, and time delay is long; Catching of P-SCH is the basis realizing three step synchronized algorithms, requires that mean acquisition time is short as far as possible on the one hand, requires that acquisition probability is large as far as possible on the one hand.

Mobile device is after normal boot-strap, also may detect the signal of neighbor cell as required, such as carry out cell reselection, cell search process is reduced to (as shown in Figure 9 C): (1) completes slot synchronization process by P-SCH, identical with start search procedure; (2) P-CPICH is used to complete frame synchronizing process.

Three, be described for IS95/CDMA2000 system

In IS95/CDMA2000 mobile communications network, all base stations are using global positioning system-markers as clock reference, are operated on same system clock.By the pilot channel in reception/demodulation forward link signal and synchronizing channel, can time service information be extracted, keep synchronous with IS95/CDMA2000 system clock, thus obtain high accuracy pulse per second (PPS) and local zone time.Because the wireless signal of cdma network is little by weather effect, meet in-door covering, suitable environment, time service speed faster that therefore IS95/cdma2000 time service module is wider than traditional GPS time service module tool.

As shown in Figure 10, IS95/CDMA2000 mobile communication system is broadcast base station short code offset and system clock in the Sync Channel Message of forward link, adopt length be 32768 m sequence carry out short code spread spectrum, spreading rate 1.2288Mbps/s.Sync channel data frame is synchronous with the short code repetition period, and be 26.66ms, three sync channel data frames form the superframe of a 80ms, comprises a complete Sync Channel Message.

Four, be described for gsm system

The base station of gsm system is by broadcast channel (BroadcastChannel, be called for short BCH) command transmitting information, it comprises three kinds of data contents: frequency corrects burst (FrequencyBurst, be called for short FB), synchronization burst (SynchronizationBurst, be called for short SB) and Broadcast Control Channel (BroadcastControlChannel is called for short BCCH).The object of cell initial search is exactly that the information understood in these bursts comes persistent district.FB is carry information not, is made up of 148 complete " 0 " bits.SB comprises a long training sequence and carries base station identity code (basestationidentitycode is called for short BSIC) and frame information, as shown in figure 11.The general information of BCCH broadcast base station, MS understands the information on it, confirm as legal after can select respective cell, complete the resident process in whole community.

FB is made up of 148 complete " 0 " bits, it is through GMSK (Guassian Minimum Shift Keying) (GaussianMinimum-ShiftKeying, be called for short GMSK) modulation after, become the sine wave of frequency higher than carrier frequency 67.708KHZ, continue 546.12 microseconds, the phase difference between adjacent bit is 90 degree.148 bits the sine wave of one-period can be made up of, so can form the sine wave in about 37 cycles 4 bits.

It should be noted that a small amount of company " 0 " bit also may appear in the end of CCCH before due to FB or idle frame, so this starting position is not accurate, the error of 1-5 bit-time may be there is, but determine that the Position Approximate of the SB that there will be is completely passable by lower frame with it, more accurate timing can be carried out according to the character of SB.

SB is made up of 156 bits, and its tail bit definitions is (BN0, BN1, BN2)=(0,0,0) and (BN145, BN146, BN147)=(0,0,0) training sequence expanded is defined as (BN42, BN43..BN105)=(1,0,1,1,1,0,0,1,0,1,1,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,1,1,1,1,0,0,1,0,1,1,0,1,0,1,0,0,0,1,0,1,0,1,1,1,0,1,1,0,0,0,0,1,1,0,1,1).Because the training sequence bit (extendedtrainingsequencebits) of expansion is known in SB, namely fix, so utilize the design feature of SB, by carrying out related operation to the data segment containing SB, the result of computing has a maximum certainly, the position occurred according to maximum and theoretic difference, can obtain accurate Timing Synchronization by adjusting local timing.

Different according to the mode of sampling to SB, timing can reach different precision.If bit sample, the precision of the Timing Synchronization so realized is bit-level.If a bit four samples, the precision of the Timing Synchronization so realized can reach 1/4 bit.

Figure 12 shows the structural representation of communication equipment in one embodiment of the invention, and as shown in figure 12, the communication equipment of the present embodiment comprises: demodulation module 1201, processing unit 1202 and playing module 1203;

Wherein, described processing unit 1202 is connected with described demodulation module 1201, described playing module 1203 respectively; Clock signal in the down channel of described demodulation module 1201 obtaining communication equipment access network, and by interrupt signal, clock signal is inputted described processing unit 1202, to make described processing unit 1202 obtain reference time information from described clock signal, described down channel is the down channel of described communication equipment access network; Described playing module 1203 adopts the reference time information in described processor to play media content.

The communication equipment of the present embodiment can obtain the reference time information of media play from down channel, and according to the reference time information of above-mentioned acquisition and other equipment carry out synchronized multimedia play time, information packet switch path and the impact of covering environment can not be subject to, and without the need to arranging special receiving equipment.

Figure 13 shows the structural representation of communication equipment in one embodiment of the invention, and as shown in figure 13, the communication equipment of the present embodiment comprises: receiving element 1301, equipment group division unit 1302, transmitting element 1303, reference time information acquisition unit 1304;

Wherein, receiving element 1301 for receive another communication equipment send described in the network information of another communication equipment, network corresponding to the described network information provides another communication equipment described to play the reference time information of media content for another communication equipment described;

Equipment group division unit 1302 is for being divided at least one equipment group according to the network information of communication equipment and the network information of another communication equipment described by described communication equipment, another communication equipment described, and in each equipment group, the networking of all devices access is identical;

Transmitting element 1303 is for sending another communication equipment described by the equipment group information belonging to another communication equipment described and the equipment group information belonging to described communication equipment;

Reference time information acquisition unit 1304, for obtaining the reference time information of described communication equipment from down channel, described down channel is the down channel of described communication equipment access network;

Described transmitting element 1303 also for the reference time information of described communication equipment is sent to all described in another communication equipment, to make with described communication equipment not when according to the reference time information of described communication equipment, another communication equipment described in same equipment group determines that another communication equipment described synchronously plays media content.

Alternatively, above-mentioned communication equipment also can comprise not shown synchronous broadcast unit 1305, and wherein, synchronous broadcast unit 1305 is for synchronously playing described media content according to reference time information and another communication equipment described of obtaining.

In embody rule process, described transmitting element 1303 also for, before described receiving element 1301 receives the network information of another communication equipment, send the first message to all another communication equipments described, described first message is for obtaining the network information of the reference time information providing media play content in another communication equipment described for another communication equipment described;

Described receiving element 1301, specifically for receiving the network information of another communication equipment described another communication equipment according to described first message transmission.

In addition, described transmitting element 1303 also for

Before described reference time information acquisition unit 1304 obtains described reference time information, send the start position information of media content to be played to another communication equipment described in all.

In possible implementation, described reference time information acquisition unit 1304 specifically for, from the demodulation module of down channel, obtain the reference time information of described communication equipment.

Above-mentioned communication equipment may correspond to the main equipment in preceding method embodiment, and it is for performing the technical scheme of as above embodiment of the method shown in Fig. 1 to Fig. 3 C, and it realizes principle and technique effect is similar, repeats no more herein.

Figure 14 shows the structural representation of communication equipment in one embodiment of the invention, and as shown in figure 14, the communication equipment of the present embodiment comprises: transmitting element 1401, receiving element 1402, reference time information acquisition unit 1403, synchronization point determining unit 1404;

Wherein, transmitting element 1401 is for sending the network information of communication equipment to another communication equipment, and network corresponding to the described network information provides described communication equipment to play the reference time information of media content for described communication equipment;

Receiving element 1402 is for the equipment group information belonging to the described communication equipment that receives another communication equipment described and send and the equipment group information belonging to another communication equipment described;

Reference time information acquisition unit 1403 for obtaining the reference time information of described communication equipment from down channel, and described down channel is the down channel of described communication equipment access network;

Described receiving element 1402 is also for after getting described reference time information in described reference time information acquisition unit 1403, receive the reference time information of another communication equipment described that another communication equipment described sends, the reference time information of another communication equipment described is that another communication equipment described obtains from the down channel of another communication equipment access network described;

When synchronization point determining unit 1404 is different from the equipment group information belonging to another communication equipment described for the equipment group information belonging to the described communication equipment in described receiving element 1402 reception, determine that the moment of media content synchronously play by described communication equipment according to the reference time information of described communication equipment and the reference time information of another communication equipment described.

Alternatively, described receiving element 1402 also for

Before described transmitting element 1401 sends the network information of described communication equipment, receive the first message that another communication equipment described sends, described first message is the network information for obtaining the reference time information providing broadcasting media content in another communication equipment described for another communication equipment described;

Described transmitting element 1401 specifically for, send the network information of another communication equipment described to described another communication equipment according to described first message.

Further, described receiving element 1402 also for, before receiving the reference time information of another communication equipment described that another communication equipment sends, receive the start position information of the media content to be played that another communication equipment described sends.

In the present embodiment, described reference time information acquisition unit 1403 specifically for, from the demodulation module of down channel, obtain the reference time information of described communication equipment.

Communication equipment in the present embodiment may correspond in said method embodiment from equipment, it is for performing the technical scheme of as above embodiment of the method shown in Fig. 4 and Fig. 5, and it realizes principle and technique effect is similar, repeats no more herein.

Figure 15 shows the structural representation of communication equipment in one embodiment of the invention, and as shown in figure 15, the communication equipment of the present embodiment comprises: memory 1501, transceiver 1502 and processor 1503; Wherein, processor 1503, memory 1501 are connected by bus 1504 with transceiver 1502.

In the present embodiment, memory 1501 is for storing instruction, and described processor 1503 is for performing described instruction;

Described transceiver 1502 for receive another communication equipment send described in the network information of another communication equipment, network corresponding to the described network information provides another communication equipment described to play the reference time information of media content for another communication equipment described;

Described processor 1503 is specifically for being divided at least one equipment group according to the network information of described communication equipment and the network information of another communication equipment described by described communication equipment, another communication equipment described, and in each equipment group, the network of all devices access is identical;

Described transceiver 1502 is described from equipment for the equipment group information belonging to another communication equipment described and the equipment group information belonging to described communication equipment being sent;

Described processor 1503 specifically for obtaining the reference time information of described communication equipment from down channel, and described down channel is the down channel of described communication equipment access network;

Described transceiver 1502 for the reference time information of described communication equipment is sent to all described in another communication equipment, to make with described communication equipment not when according to the reference time information of described communication equipment, another communication equipment described in same equipment group determines that another communication equipment described synchronously plays media content.

Described processor is also for before acquisition reference time information, to the start position information sending media content to be played described in all from equipment, thus, synchronously described media content is play according to the reference time information obtained and another communication equipment described obtaining after reference time information.

In a kind of possible implementation, aforesaid transceiver is also for sending the first message to another all communication equipments, and described first message provides the network information of the reference time information playing media content for obtaining another communication equipment affiliated in another communication equipment described;

And then receive the network information of another communication equipment described another communication equipment according to described first message transmission.

Figure 16 shows the structural representation of communication equipment in one embodiment of the invention, and as shown in figure 16, the communication equipment of the present embodiment comprises: memory 1601, transceiver 1602 and processor 1603; Wherein, processor 1603, memory 1601 are connected by bus 1604 with transceiver 1602.

In the present embodiment, memory 1601 is for storing instruction, and described processor 1603 is for performing described instruction;

Described transceiver 1602 is for sending the network information of described communication equipment to another communication equipment, network corresponding to the described network information provides described communication equipment to play the reference time information of media content for described communication equipment; And receive the described equipment group information belonging to described communication equipment of another communication equipment transmission and the equipment group information belonging to another communication equipment described;

Described processor 1603 specifically for obtaining the described reference time information from equipment from down channel, and described down channel is the down channel of described communication equipment access network;

Described transceiver 1602 is for receiving the reference time information of another communication equipment equipment described in described another communication equipment transmission, and the reference time information of another communication equipment described is that another communication equipment described obtains from the down channel of another communication equipment access network described;

Described processor 1603 is specifically for when the equipment group information belonging to described communication equipment is different from the equipment group information belonging to another communication equipment described, according to the reference time information of described communication equipment and the reference time information of another communication equipment described, described communication equipment determines that the moment of media content synchronously play by described communication equipment.

In the present embodiment, before described transceiver sends the network information to another communication equipment, for receiving the first message that another communication equipment described sends, described first message is the network information for obtaining the reference time information providing broadcasting media content in described communication equipment for described communication equipment;

And then send the network information of described communication equipment to another communication equipment according to described first message.

In addition, transceiver also for before described processor acquisition reference time information, receives the start position information of the media content to be played that another communication equipment described sends.

One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.

Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims

1. for a clock synchronizing method for media play, it is characterized in that, comprising:

2. method according to claim 1, is characterized in that, described method also comprises:

3. method according to claim 1, is characterized in that, described main equipment receive to send from equipment described in from before the network information of equipment, described method also comprises:

4., according to the arbitrary described method of claims 1 to 3, it is characterized in that, before described main equipment obtains the step of reference time information of described main equipment from down channel, described method also comprises:

5., according to the arbitrary described method of Claims 1-4, it is characterized in that, described main equipment obtains the reference time information of described main equipment from down channel, comprising:

6. for a clock synchronizing method for media play, it is characterized in that, comprising:

7. method according to claim 6, is characterized in that, described send the described step from the network information of equipment from equipment to main equipment before, described method also comprises:

8. the method according to claim 6 or 7, is characterized in that, before the step of the reference time information of the described main equipment from the transmission of equipment reception main equipment, also comprises:

9., according to the arbitrary described method of claim 6 to 8, it is characterized in that, described from the reference time information from equipment described in equipment obtains from down channel, comprising:

10. a communication equipment, is characterized in that, comprising:

Demodulation module, processing unit and playing module;

11. 1 kinds of communication equipments, is characterized in that, comprising:

12. communication equipments according to claim 11, is characterized in that, described equipment also comprises:

13. communication equipments according to claim 11, is characterized in that, described transmitting element, also for

14., according to claim 11 to 13 arbitrary described communication equipments, is characterized in that, described transmitting element, also for

15., according to claim 11 to 14 arbitrary described communication equipments, is characterized in that, described reference time information acquisition unit, specifically for

16. 1 kinds of communication equipments, is characterized in that, comprising:

17. communication equipments according to claim 16, is characterized in that, described receiving element, also for

Described transmitting element, specifically for

18. communication equipments according to claim 16 or 17, is characterized in that, described receiving element also for

19., according to claim 16 to 18 arbitrary described communication equipments, is characterized in that, described reference time information acquisition unit, specifically for