CN104579746A - Method and device for controlling dual-link transmission - Google Patents
Method and device for controlling dual-link transmission Download PDFInfo
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- CN104579746A CN104579746A CN201410742732.8A CN201410742732A CN104579746A CN 104579746 A CN104579746 A CN 104579746A CN 201410742732 A CN201410742732 A CN 201410742732A CN 104579746 A CN104579746 A CN 104579746A
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Abstract
The embodiment of the invention provides a method and device for controlling dual-link transmission. The method for controlling the dual-link transmission comprises the following steps: dialing for creating a link through a first modem by a control terminal to create a first link; performing heartbeat detection on the first link by the control terminal, and judging whether the first link is abnormal or not according to a heartbeat detection result; if the first link is abnormal, dialing for creating a link through a second modem by the control terminal to create a second link. Through the use of the method for controlling the dual-link transmission, disclosed by the embodiment of the invention, after a wireless link is abnormal, recovery time of data transmission can be shortened, and the stability of the data transmission on a mobile communication link is improved.
Description
Technical field
The embodiment of the present invention relates to mobile communication technology, particularly relates to a kind of dual link transfer control method and device.
Background technology
Use mobile communication (such as GSM, CDMA etc.) link to carry out transfer of data to need first to control modulator-demodulator (Modem) and carry out dialing link setup, dialing link setup successfully laggard row transfer of data.
In prior art, occur abnormal when wireless link in data transmission procedure and when cannot recover, need to wait for that Modem resource discharges successfully and just can re-start dialing link setup.Suppose that dialing link setup needs the time to be t1, it is t2 that link cannot recover the rear Modem releasing resource time extremely, then, when using single-link to carry out transfer of data, link occurs abnormal, and the time that transfer of data is recovered again at least needs: t2+t1.
After causing data-transmission interruptions because the generation of mobile communication link is abnormal in prior art, the stand-by period of date restoring transmission is longer, the poor stability of transfer of data.
Summary of the invention
The embodiment of the present invention provides a kind of dual link transfer control method and device, to reduce the recovery time of the transfer of data after mobile communication link exception.
First aspect, the embodiment of the present invention provides a kind of dual link transfer control method, and wherein, described method comprises:
Control terminal carries out dialing link setup by the first modulator-demodulator, sets up the first link;
Described control terminal carries out heartbeat detection to described first link, and according to the result of described heartbeat detection, judges whether described first link occurs exception;
It is abnormal if judge, described first link occurs, then described control terminal carries out dialing link setup by second modem, sets up the second link.
According to first aspect, in the first possible implementation of first aspect, described control terminal carries out heartbeat detection to described first link, comprising:
Described control terminal regularly sends heartbeat detection request by described first chain road direction Control Server;
Described control terminal receives the heartbeat request reply that described Control Server returns.
According to the first possible implementation of first aspect, in the implementation that the second of first aspect is possible, described control terminal regularly sends heartbeat detection request by described first chain road direction Control Server, comprising:
If described control terminal does not carry out transfer of data by described first link, then send heartbeat detection request according to Fixed Time Interval to described Control Server by described first link;
Or,
If described control terminal carries out transfer of data by described first link, then described control terminal often sends data, is considered as have sent a heartbeat detection request to described Control Server.
According to the first possible implementation of first aspect, in the third possible implementation of first aspect, the described result according to described heartbeat detection, judges whether described first link occurs exception, comprising:
If T-S>c, then judge described heartbeat detection request timed out; Wherein, described T is current time, and described S is the transmitting time of described heartbeat detection request, and described c is timeout threshold;
If the number of the heartbeat detection request timed out that described first link occurs continuously exceedes number of attempt threshold value, then described control terminal judges that described first link occurs extremely.
According to the first possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, judge that if described described first link occurs abnormal, then carry out dialing link setup by second modem, after setting up the second link, also comprise:
If described control terminal determines the non-chain rupture of described first link, then carry out dual link transmission; Wherein, described dual link transmission refers to that identical data are transmitted by described control terminal respectively on described first link and described second link, if described Control Server first receives described data on described first link, then described Control Server forwards described data, and the described data received from described second link is abandoned; Or if described Control Server first receives described data on described second link, then described Control Server forwards described data, and described data will be received from described first link and abandon;
Or,
If described control terminal determines the chain rupture of described first link, then carry out transfer of data by described second link.
According to the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation of first aspect, if described control terminal determines the non-chain rupture of described first link, then, after carrying out dual link transmission, also comprise:
Described control terminal carries out heartbeat detection to described first link and described second link respectively;
If T-M2>=d, and the time period (T – d, T] in, all there is not heartbeat detection request timed out in described first link and described second link, then described control terminal hangs up described second link;
If T-M2>=d, and the time period (T – d, T] in, there is heartbeat detection request timed out in described first link and/or described second link, then described control terminal proceed dual link transmission;
Wherein, described T is current time, and described M2 is the link establishment moment of described second link, and described d is that dual link transmission controls thresholding.
According to first aspect, in the 6th kind of possible implementation of first aspect, also comprise:
If it is unsuccessful that described control terminal carries out dialing link setup by described second modem, then control described first modulator-demodulator and described second modem carries out dialing link setup respectively again.
Second aspect, the embodiment of the present invention provides a kind of dual link transmission control unit, and wherein, described device comprises: dial key chain module, for carrying out dialing link setup by the first modulator-demodulator, sets up the first link;
Heart beat detection module, for carrying out heartbeat detection to described first link, and according to the result of described heartbeat detection, judges whether described first link occurs exception;
Described dial key chain module, if it is abnormal also to judge that described first link occurs for described heart beat detection module, then carries out dialing link setup by second modem, sets up the second link.
According to second aspect, in the first possible implementation of second aspect, described heart beat detection module, specifically for: regularly send heartbeat detection request by described first chain road direction Control Server; Receive the heartbeat request reply that described Control Server returns.
According to the first possible implementation of second aspect, in the implementation that the second of second aspect is possible, described heart beat detection module, specifically for: if described dual link transmission control unit does not carry out transfer of data by described first link, then send heartbeat detection request according to Fixed Time Interval to described Control Server by described first link; Or,
If described dual link transmission control unit carries out transfer of data by described first link, then described dual link transmission control unit often sends data, is considered as described heart beat detection module and have sent a heartbeat detection request to described Control Server.
According to the first possible implementation of second aspect, in the third possible implementation of second aspect, described heart beat detection module, specifically for:
If T-S>c, then judge described heartbeat detection request timed out; Wherein, described T is current time, and described S is the transmitting time of described heartbeat detection request, and described c is timeout threshold;
If the number of the heartbeat detection request timed out that described first link occurs continuously exceedes number of attempt threshold value, then judge that described first link occurs abnormal.
According to the first possible implementation of second aspect, in the 4th kind of possible implementation of second aspect, also comprise:
Transport module, if abnormal for judging that at described heart beat detection module described first link occurs, then carry out dialing link setup by second modem, after setting up the second link, if described heart beat detection module judges the non-chain rupture of described first link, then carry out dual link transmission; Wherein, described dual link transmission refers to that identical data are transmitted by described control terminal respectively on described first link and described second link, if described Control Server first receives described data on described first link, then described Control Server forwards described data, and the described data received from described second link is abandoned; Or if described Control Server first receives described data on described second link, then described Control Server forwards described data, and described data will be received from described first link and abandon;
Or,
If described heart beat detection module judges the chain rupture of described first link, then carry out transfer of data by described second link.
According to the 4th kind of possible implementation of second aspect, in the 5th kind of possible implementation of second aspect, described heart beat detection module, if specifically for determining the non-chain rupture of described first link at described control terminal, after then carrying out dual link transmission, respectively heartbeat detection is carried out to described first link and described second link;
If T-M2>=d, and the time period (T – d, T] in, all there is not heartbeat detection request timed out in described first link and described second link, then described dial key chain module hangs up described second link;
If T-M2>=d, and the time period (T – d, T] in, there is heartbeat detection request timed out in described first link and/or described second link, then described transport module proceed dual link transmission;
Wherein, described T is current time, and described M2 is the link establishment moment of described second link, and described d is that dual link transmission controls thresholding.
According to second aspect, in the 6th kind of possible implementation of second aspect, described dial key chain module also for: if it is unsuccessful to carry out dialing link setup by second modem, then control described first modulator-demodulator and described second modem carries out dialing link setup respectively again.
The dual link transfer control method that the embodiment of the present invention provides and device, control terminal carries out dialing link setup by the first modulator-demodulator, sets up the first link; Described control terminal carries out heartbeat detection to described first link, and according to the result of described heartbeat detection, judges whether described first link occurs exception; It is abnormal if judge, described first link occurs, then described control terminal carries out dialing link setup by second modem, set up the second link, the recovery time of the transfer of data after minimizing mobile communication link is abnormal, improve the stability of transfer of data on mobile communication link.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the dual link transmission net control that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the dual link transfer control method that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the dual link transmission control unit that Fig. 3 provides for the embodiment of the present invention;
The another structural representation of the dual link transmission control unit that Fig. 4 provides for the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The structural representation of the dual link transmission net control that Fig. 1 provides for the embodiment of the present invention.The flow chart of the dual link transfer control method that Fig. 2 provides for the embodiment of the present invention.As depicted in figs. 1 and 2, the dual link transmission net control that the embodiment of the present invention provides comprises: mobile unit 10, ground network 20, dual link Control Server 21 and mobile communications network 30, wherein, described mobile unit 10 comprises: mobile unit network 11, dual link control terminal 12, first modulator-demodulator 13, second modem 14.Data interaction between mobile unit network 11 and ground network 20 is forwarded by dual link control terminal 12, dual link Control Server 21.Dual link control terminal 12 realizes dual link transmission by control two modulator-demodulators (the first modulator-demodulator 13, second modem 14) and controls, to reduce the recovery time of the transfer of data after mobile communication link exception.
The dual link transfer control method that the embodiment of the present invention provides comprises:
101, control terminal carries out dialing link setup by the first modulator-demodulator, sets up the first link.
Particularly, described control terminal can be the dual link control terminal 12 shown in Fig. 1.
102, described control terminal carries out heartbeat detection to described first link, and according to the result of described heartbeat detection, judges whether described first link occurs exception;
If 103 judge that described first link occurs that then described control terminal carries out dialing link setup by second modem, sets up the second link extremely.
Particularly, in embodiments of the present invention, control terminal carries out dialing link setup by the first modulator-demodulator, sets up the first link; Described control terminal carries out heartbeat detection to described first link, and according to the result of described heartbeat detection, judges whether described first link occurs exception, judge the communication quality of described first link with this.If it is abnormal that described control terminal judges that described first link occurs, then described control terminal carries out dialing link setup by second modem, sets up the second link.
When wireless link in data transmission procedure occurs abnormal and when cannot recover in prior art, need to wait for that modem resource discharges successfully and just can re-start dialing link setup, suppose that the dialing link setup time is t1, it is t2 that link cannot recover the rear modulator-demodulator releasing resource time extremely, when wireless link occurs extremely, the time that transfer of data is recovered again at least needs t2+t1; Wherein, wireless link can comprise chain rupture, poor signal quality, wireless module fault etc. extremely, and owing to causing the factor of link exception different, the value of t2 is not fixed, and size is generally several seconds to tens seconds.
But, in the embodiment of the present invention, when control terminal judges that the first link occurs extremely, then carry out dialing link setup to set up the second link by second modem, suppose by carrying out heartbeat detection to the first link and judging that the first link occurs that the abnormal time is as t3, when the first link occurs extremely, the time that transfer of data is recovered at least needs t3+t1.Under actual conditions, t3 carries out corresponding configuration according to different networks, and the value of t3 is determined, size is several milliseconds and arrives hundreds of millisecond.
It is evident that, there is much smaller than wireless link in prior art the time (t2+t1) that abnormal rear transfer of data is recovered again in the time (t3+t1) that in the embodiment of the present invention, transfer of data is recovered.Visible, the dual link transfer control method that the embodiment of the present invention provides, can reduce the recovery time of the abnormal rear transfer of data of wireless link, improve the stability of transfer of data on mobile communication link.
On the basis of above-described embodiment, control terminal to a kind of implementation that described first link carries out heartbeat detection is: after the first link establishment success, control terminal regularly sends heartbeat detection request by the first chain road direction Control Server; After Control Server receives the heartbeat detection request of control terminal transmission, reply heartbeat request by the first chain road direction control terminal immediately and reply; Control terminal receives the heartbeat request reply that Control Server returns.
In one embodiment of the invention, if control terminal does not carry out transfer of data by described first link, then send heartbeat detection request according to Fixed Time Interval to described Control Server by described first link.Particularly, if heartbeat timer is H, Fixed Time Interval (i.e. eartbeat interval) is i, and current time is T, and heartbeat detection request also can be described as heartbeat message.Under mobile unit network does not have data transmission scenarios to ground network direction, the send mode of heartbeat message is as follows: as T-H=i, sends a heartbeat message (this is common heartbeat), arranges H=T simultaneously.
In one embodiment of the invention, if control terminal carries out transfer of data by described first link, then control terminal often sends data, is considered as have sent a heartbeat detection request to described Control Server.Particularly, after control terminal receives the data of mobile unit network transmission, earthward during forwarded, each data message is used as a heartbeat message simultaneously; When T moment forwarding data packets (be considered as have sent a heartbeat message, this is data heartbeat simultaneously), H=T is set simultaneously.
In one embodiment of the invention, control terminal according to the result of described heartbeat detection, judge described first link whether occur abnormal implementation as:
After control terminal sends a heartbeat message (common heartbeat or data heartbeat), control terminal can record the information such as mark, transmitting time of this heartbeat message.Control terminal can carry out time-out to the heartbeat message of these records and detect, and suppose that timeout threshold is c, described T is current time, and described S is the transmitting time of described heartbeat detection request;
If as T-S>c, control terminal does not also receive the heartbeat request reply that Control Server returns, then judge described heartbeat message (i.e. heartbeat detection request) time-out; Delete this heartbeat message information.
When control terminal receive heartbeat request that Control Server returns reply time, if T-S<=c, then judge that described heartbeat message (i.e. heartbeat detection request) does not have time-out; Or, if T-S>c, then judge described heartbeat message time-out.
If the number of the heartbeat detection request timed out that described first link occurs continuously exceedes number of attempt threshold value, then described control terminal judges that described first link occurs extremely; Wherein, described number of attempt threshold value is that control terminal allows a link to occur the number thresholding of heartbeat detection request timed out continuously.
Optionally, described number of attempt threshold value can comprise: common heartbeat number of attempt threshold value and data heartbeat number of attempt threshold value.Particularly, suppose that the common beats that control terminal allows a link overtime is continuously p, the data beats that control terminal allows a link overtime is continuously q.If when the common beats of the continuous time-out of link is greater than p, judge that this link occurs abnormal; If when the data beats of the continuous time-out of link is greater than q, judge that this link occurs abnormal.
In one embodiment of the invention, it is abnormal if judge, described first link occurs, then carry out dialing link setup by second modem, after successfully setting up the second link:
If described control terminal determines the non-chain rupture of described first link, then carry out dual link transmission; Described dual link transmission refers to that identical data are transmitted by described control terminal respectively on described first link and described second link, if described Control Server first receives described data on described first link, then described Control Server forwards described data, and the described data received from described second link is abandoned; Or if described Control Server first receives described data on described second link, then described Control Server forwards described data, and described data will be received from described first link and abandon.Whether described control terminal is hung up a wherein link according to link detecting strategy decision, and is continued to use the link do not hung up to carry out single-link transmission after continuing to carry out the dual link transmission of a period of time; If described control terminal carries out in the process of dual link transmission, wherein a link occurs abnormal, then described control terminal directly uses another link to carry out single-link transfer of data.
Further, described link detecting strategy is: if described control terminal determines the non-chain rupture of described first link, then after carrying out dual link transmission, described control terminal carries out heartbeat detection to described first link and described second link respectively;
If T-M2>=d, and the time period (T – d, T] in, all there is not heartbeat detection request timed out in described first link and described second link, then described control terminal hangs up described second link;
If T-M2>=d, and the time period (T – d, T] in, there is heartbeat detection request timed out in described first link and/or described second link, then described control terminal proceed dual link transmission;
Wherein, described T is current time, and described M2 is the link establishment moment of described second link, and described d is that dual link transmission controls thresholding.
Or if described control terminal determines the chain rupture of described first link, then described control terminal directly carries out transfer of data by described second link.
In one embodiment of the invention, when described control terminal carries out the failure of dialing link setup by second modem, described control terminal controls described first modulator-demodulator and described second modem carries out dial key chain respectively.
The structural representation of the dual link transmission control unit that Fig. 3 provides for the embodiment of the present invention.The dual link transmission control unit that the embodiment of the present invention provides may be used for the technical scheme performing embodiment of the method shown in Fig. 2.As shown in Figure 3, the dual link transmission control unit that the embodiment of the present invention provides comprises:
Dial key chain module 301, for carrying out dialing link setup by the first modulator-demodulator, sets up the first link;
Heart beat detection module 302, for carrying out heartbeat detection to described first link, and according to the result of described heartbeat detection, judges whether described first link occurs exception;
Described dial key chain module 301, if it is abnormal also to judge that described first link occurs for described heart beat detection module 302, then carries out dialing link setup by second modem, sets up the second link.
The dual link transmission control unit that the embodiment of the present invention provides, can reduce the recovery time of the abnormal rear transfer of data of wireless link, improve the stability of transfer of data on mobile communication link.
In one embodiment of the invention, described heart beat detection module 302, specifically for: regularly send heartbeat detection request by described first chain road direction Control Server; Receive the heartbeat request reply that described Control Server returns.
Optionally, described heart beat detection module 302, specifically for: if described dual link transmission control unit does not carry out transfer of data by described first link, then send heartbeat detection request according to Fixed Time Interval to described Control Server by described first link; Or,
If described dual link transmission control unit carries out transfer of data by described first link, then described dual link transmission control unit often sends data, is considered as described heart beat detection module 302 and have sent a heartbeat detection request to described Control Server.
Optionally, described heart beat detection module 302, specifically for:
If T-S>c, then judge described heartbeat detection request timed out; Wherein, described T is current time, and described S is the transmitting time of described heartbeat detection request, and described c is timeout threshold;
If the number of the heartbeat detection request timed out that described first link occurs continuously exceedes number of attempt threshold value, then judge that described first link occurs abnormal.
The another structural representation of the dual link transmission control unit that Fig. 4 provides for the embodiment of the present invention.The dual link transmission control unit that the embodiment of the present invention provides is based on the device shown in Fig. 3, further, the dual link transmission control unit that the embodiment of the present invention provides also comprises: transport module 303, if abnormal for judging that at described heart beat detection module 302 described first link occurs, then carry out dialing link setup by second modem, after setting up the second link, if described heart beat detection module 302 judges the non-chain rupture of described first link, then carry out dual link transmission; Wherein, described dual link transmission refers to that identical data are transmitted by described control terminal respectively on described first link and described second link, if described Control Server first receives described data on described first link, then described Control Server forwards described data, and the described data received from described second link is abandoned; Or if described Control Server first receives described data on described second link, then described Control Server forwards described data, and described data will be received from described first link and abandon;
Or,
If described heart beat detection module 302 judges the chain rupture of described first link, then carry out transfer of data by described second link.
Further, described heart beat detection module 302, if specifically for determining the non-chain rupture of described first link at described control terminal, then, after carrying out dual link transmission, carries out heartbeat detection to described first link and described second link respectively;
If T-M2>=d, and the time period (T – d, T] in, all there is not heartbeat detection request timed out in described first link and described second link, then described dial key chain module hangs up described second link;
If T-M2>=d, and the time period (T – d, T] in, there is heartbeat detection request timed out in described first link and/or described second link, then described transport module proceed dual link transmission;
Wherein, described T is current time, and described M2 is the link establishment moment of described second link, and described d is that dual link transmission controls thresholding.
In one embodiment of the invention, described dial key chain module 301 also for: if it is unsuccessful to carry out dialing link setup by second modem, then control described first modulator-demodulator and described second modem carries out dialing link setup respectively again.
The dual link transmission control unit that the embodiment of the present invention provides, can reduce the recovery time of the abnormal rear transfer of data of wireless link, improve the stability of transfer of data on mobile communication link.
In several embodiment provided by the present invention, should be understood that, disclosed apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that hardware also can be adopted to add SFU software functional unit realizes.
The above-mentioned integrated unit realized with the form of SFU software functional unit, can be stored in a computer read/write memory medium.Above-mentioned SFU software functional unit is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) or processor (processor) perform the part steps of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. various can be program code stored medium.
Those skilled in the art can be well understood to, for convenience and simplicity of description, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, internal structure by device is divided into different functional modules, to complete all or part of function described above.The specific works process of the device of foregoing description, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
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 (14)
1. a dual link transfer control method, comprising:
Control terminal carries out dialing link setup by the first modulator-demodulator, sets up the first link;
Described control terminal carries out heartbeat detection to described first link, and according to the result of described heartbeat detection, judges whether described first link occurs exception;
It is abnormal if judge, described first link occurs, then described control terminal carries out dialing link setup by second modem, sets up the second link.
2. method according to claim 1, is characterized in that, described control terminal carries out heartbeat detection to described first link, comprising:
Described control terminal regularly sends heartbeat detection request by described first chain road direction Control Server;
Described control terminal receives the heartbeat request reply that described Control Server returns.
3. method according to claim 2, is characterized in that, described control terminal regularly sends heartbeat detection request by described first chain road direction Control Server, comprising:
If described control terminal does not carry out transfer of data by described first link, then send heartbeat detection request according to Fixed Time Interval to described Control Server by described first link;
Or,
If described control terminal carries out transfer of data by described first link, then described control terminal often sends data, is considered as have sent a heartbeat detection request to described Control Server.
4. method according to claim 2, is characterized in that, the described result according to described heartbeat detection, judges whether described first link occurs exception, comprising:
If T-S>c, then judge described heartbeat detection request timed out; Wherein, described T is current time, and described S is the transmitting time of described heartbeat detection request, and described c is timeout threshold;
If the number of the heartbeat detection request timed out that described first link occurs continuously exceedes number of attempt threshold value, then described control terminal judges that described first link occurs extremely.
5. method according to claim 2, is characterized in that, judges that described first link occurs abnormal, then carry out dialing link setup by second modem, after setting up the second link, also comprise if described:
If described control terminal determines the non-chain rupture of described first link, then carry out dual link transmission; Wherein, described dual link transmission refers to that identical data are transmitted by described control terminal respectively on described first link and described second link, if described Control Server first receives described data on described first link, then described Control Server forwards described data, and the described data received from described second link is abandoned; Or if described Control Server first receives described data on described second link, then described Control Server forwards described data, and described data will be received from described first link and abandon;
Or,
If described control terminal determines the chain rupture of described first link, then carry out transfer of data by described second link.
6. method according to claim 5, is characterized in that, if described control terminal determines the non-chain rupture of described first link, then, after carrying out dual link transmission, also comprises:
Described control terminal carries out heartbeat detection to described first link and described second link respectively;
If T-M2>=d, and the time period (T – d, T] in, all there is not heartbeat detection request timed out in described first link and described second link, then described control terminal hangs up described second link;
If T-M2>=d, and the time period (T – d, T] in, there is heartbeat detection request timed out in described first link and/or described second link, then described control terminal proceed dual link transmission;
Wherein, described T is current time, and described M2 is the link establishment moment of described second link, and described d is that dual link transmission controls thresholding.
7. method according to claim 1, is characterized in that, also comprises:
If it is unsuccessful that described control terminal carries out dialing link setup by described second modem, then control described first modulator-demodulator and described second modem carries out dialing link setup respectively again.
8. a dual link transmission control unit, comprising:
Dial key chain module, for carrying out dialing link setup by the first modulator-demodulator, sets up the first link;
Heart beat detection module, for carrying out heartbeat detection to described first link, and according to the result of described heartbeat detection, judges whether described first link occurs exception;
Described dial key chain module, if it is abnormal also to judge that described first link occurs for described heart beat detection module, then carries out dialing link setup by second modem, sets up the second link.
9. device according to claim 8, is characterized in that, described heart beat detection module, specifically for: regularly send heartbeat detection request by described first chain road direction Control Server; Receive the heartbeat request reply that described Control Server returns.
10. device according to claim 9, it is characterized in that, described heart beat detection module, specifically for: if described dual link transmission control unit does not carry out transfer of data by described first link, then send heartbeat detection request according to Fixed Time Interval to described Control Server by described first link; Or,
If described dual link transmission control unit carries out transfer of data by described first link, then described dual link transmission control unit often sends data, is considered as described heart beat detection module and have sent a heartbeat detection request to described Control Server.
11. devices according to claim 9, is characterized in that, described heart beat detection module, specifically for:
If T-S>c, then judge described heartbeat detection request timed out; Wherein, described T is current time, and described S is the transmitting time of described heartbeat detection request, and described c is timeout threshold;
If the number of the heartbeat detection request timed out that described first link occurs continuously exceedes number of attempt threshold value, then judge that described first link occurs abnormal.
12. devices according to claim 9, is characterized in that, also comprise:
Transport module, if abnormal for judging that at described heart beat detection module described first link occurs, then carry out dialing link setup by second modem, after setting up the second link, if described heart beat detection module judges the non-chain rupture of described first link, then carry out dual link transmission; Wherein, described dual link transmission refers to that identical data are transmitted by described control terminal respectively on described first link and described second link, if described Control Server first receives described data on described first link, then described Control Server forwards described data, and the described data received from described second link is abandoned; Or if described Control Server first receives described data on described second link, then described Control Server forwards described data, and described data will be received from described first link and abandon;
Or,
If described heart beat detection module judges the chain rupture of described first link, then carry out transfer of data by described second link.
13. devices according to claim 12, it is characterized in that, described heart beat detection module, if specifically for determining the non-chain rupture of described first link at described control terminal, after then carrying out dual link transmission, respectively heartbeat detection is carried out to described first link and described second link;
If T-M2>=d, and the time period (T – d, T] in, all there is not heartbeat detection request timed out in described first link and described second link, then described dial key chain module hangs up described second link;
If T-M2>=d, and the time period (T – d, T] in, there is heartbeat detection request timed out in described first link and/or described second link, then described transport module proceed dual link transmission;
Wherein, described T is current time, and described M2 is the link establishment moment of described second link, and described d is that dual link transmission controls thresholding.
14. devices according to claim 8, it is characterized in that, described dial key chain module also for: if it is unsuccessful to carry out dialing link setup by second modem, then control described first modulator-demodulator and described second modem carries out dialing link setup respectively again.
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