CN103731231A - Method and device for identifying frame types - Google Patents
Method and device for identifying frame types Download PDFInfo
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- CN103731231A CN103731231A CN201210385042.2A CN201210385042A CN103731231A CN 103731231 A CN103731231 A CN 103731231A CN 201210385042 A CN201210385042 A CN 201210385042A CN 103731231 A CN103731231 A CN 103731231A
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Abstract
The invention discloses a method and device for identifying frame types. The method is characterized in that FTC fields used for identifying the frame types are additionally arranged in data frames, and the types of the received data frames are identified according to information contents carried by the FTC fields, and therefore the condition that in the prior art, due to the fact that the types of the data frames are identified through frame synchronous codes, a plurality of synchronization judging modules are required to simultaneously work at a receiving terminal is avoided; the FTC fields in the data frames are detected, and the information contents carried by the FTC fields are searched to determine the types of the data frames. The method and device are convenient and easy to use, the complexity of devices at the receiving terminal is lowered, and system resources are saved.
Description
Technical field
The present invention relates to digital intercom equipment technical field, relate in particular to a kind of recognition methods and equipment of frame type.
Background technology
Along with the development of radio communication technology, the demand that people improve wireless talkback communication quality is more and more higher, and on the other hand, due to the growing tension of frequency spectrum resource, the digital intercom equipment take operating factor of highband as feature more and more receives everybody concern.
Digital intercom equipment is the Wireless Telecom Equipment that an a kind of point-to-multipoint wireless and that can use in movement communicates, belong to special digital wireless communication technology field, because it has instant communication, operation cost is low, equipment volume is little, easy to use, speech quality high, be widely used; Digital intercom equipment is the talk back equipment that adopts digital technology to design, and by digitization of speech signals, with digital coding form, propagates.
At present, apply in the world digital intercom equipment air interface protocol more widely and comprise dPMR (Digital Private Mobile Radio, the private mobile radio of numeral), DMR (Digital MobileRadio, digital mobile radio), P25 (Project25, project 25) etc., wherein, dPMR is based on FDMA(Frequency Division Multiple Access, frequency division multiple access) technology, DMR is based on TDMA(Time Division Multiple Access, time division multiple access) technology, dPMR and DMR are as ETSI(European Telecommunications Standards Institute, ETSI) international standard formulated obtained the application of reasonable business.
But, as shown in Figure 1, for a kind of frame structure schematic diagram of dPMR definition, in dPMR, defined the frame structure of Four types: a business frame, a grouped data frame, tail frame and load frame.A business frame and a grouped data frame are referred to as again a frame, wherein: a frame comprised be no less than the lead code (P) of 72 bits, 48 bit FS1(or FS4 of and frame identification synchronous for achieve frame) (Frame Sync, synchronous code), for identifying the CC(Color Code of transmitting terminal frequency, colour coding) and HI(Header Information, a frame information); Tail frame has comprised FS3 and the tail frame data of 24 bits for carrying out frame synchronization and identification tail frame; Load frame has comprised the CCH(Control Channel of the FS2 of 24 bits for carrying out frame synchronization and identification frames type or colour coding CC, 72 bits, control channel) and the TCH(Traffic Channel of 4 72 bits, Traffic Channel).
Wherein, the corresponding business frame of FS1, the corresponding grouped data frame of FS4.
Particularly, when receiving terminal prepares to receive one group of Frame of transmitting terminal transmission, first, need to carry out frame synchronization operation, determine frame synchronization, confirm the data frame type receiving simultaneously.Secondly, definite, receive after the type of Frame, in relevant position, extract CC and judge that whether the frequency configuration of the wireless signal receiving is consistent with the frequency configuration of self expecting,, if so, continue the follow-up Frame of reception; Otherwise rejection.
As can be seen here, owing to there being four kinds of synchronous codes in dPMR, therefore receiving terminal at least needs two sync correlation equipment to work intercepting in channel simultaneously, first the Frame receiving is carried out to the synchronous of a frame (FS1 or FS4) and load frame (FS2), and synchronously judge, after definite initial frame is synchronous, carry out data receiver, in DRP data reception process, load frame in Frame and tail frame are synchronously identified simultaneously, and utilize synchronous result to determine load frame and tail frame, utilize like this mechanism of frame swynchronization code identification frame type, cause system must have at least two synchronous determination modules to work at synchronization simultaneously, therefore complexity and the resource consumption of system have been increased.
Summary of the invention
The embodiment of the present invention provides a kind of recognition methods and equipment of frame type, higher for solving the system complexity that prior art utilizes synchronous code identification frame type to cause, and causes the problem of the wasting of resources.
A recognition methods for frame type, described method comprises:
Receiving data frames, has comprised frame type coding FTC field in described Frame;
The information content of carrying according to described FTC field, determines the type of this Frame.
An identification equipment for frame type, described equipment comprises:
Receiver module, for receiving data frames, has comprised frame type coding FTC field in described Frame;
Determination module, for the information content of carrying according to described FTC field, determines the type of this Frame.
Beneficial effect of the present invention is as follows:
The embodiment of the present invention by having increased the frame type coding FTC field for identifying frame type in Frame, the information content of carrying by FTC field is identified the type of the Frame receiving, avoided like this utilizing in prior art frame swynchronization code identification data frame type to cause the situation of simultaneously carrying out work at the multiple synchronous determination modules of receiving terminal needs, by detecting the FTC field in Frame, search the type of its information content specified data frame carrying, easy to use and simple, reduce the complexity of receiving device, saved system resource.
Accompanying drawing explanation
Fig. 1 is a kind of frame structure schematic diagram of dPMR definition;
Fig. 2 is the flow chart of the recognition methods of a kind of frame type of the embodiment of the present invention one;
Fig. 3 is the structural representation of a frame;
Fig. 4 is the structural representation of load frame;
Fig. 5 is the structural representation of tail frame;
Fig. 6 is a kind of structural representation of superframe;
Fig. 7 is the structural representation of the identification equipment of a kind of frame type of the embodiment of the present invention two.
Embodiment
In order to realize object of the present invention, the embodiment of the present invention provides a kind of recognition methods and equipment of frame type, by increased the frame type coding FTC field for identifying frame type in Frame, the information content of carrying by FTC field is identified the type of the Frame receiving, avoided like this utilizing in prior art frame swynchronization code identification data frame type to cause the situation of simultaneously carrying out work at the multiple synchronous determination modules of receiving terminal needs, by detecting the FTC field in Frame, search the type of its information content specified data frame carrying, easy to use and simple, reduced the complexity of receiving device, saved system resource.
Below in conjunction with Figure of description, various embodiments of the present invention are described in detail.
Embodiment mono-:
As shown in Figure 2, be the flow chart of the recognition methods of a kind of frame type of the embodiment of the present invention one, described method comprises:
Step 101: receiving data frames.
Wherein, in described Frame, comprised frame type coding (Frame Type Code, FTC) field.
Described FTC field can be the binary code of N bit, can also be other forms of code element, and wherein, N is integer, need to determine the content of FTC field according to practical application.
When FTC field is passed through the binary code representation of 8 bits, the information content that described FTC field is carried is bit arrangement pattern in 8 bit binary code, for example, and 10010110,10100101 etc.;
When FTC field represents by other forms, can determine its format information according to the form of expression of FTC field, regard this format information as the information content that FTC field is carried.
After determining the form of expression of FTC field, set up the corresponding relation between format information and the data frame type of FTC field,
For example: suppose that FTC field is the binary code of 8 bits, suppose that definite frame type has four kinds, the corresponding relation between the bit arrangement pattern that now can set up FTC field and frame type: (10010110) corresponding frame type one; (01101001) corresponding frame type two; (10100101) corresponding frame type three; (01011010) corresponding frame type four.
Wherein, described bit arrangement pattern has comprised the format information that field distributes.
Here for FTC field and the information content of carrying, be not specifically limited, can be used for identifying frame type can.
In step 101, because digital intercom equipment is as the communication equipment of a point-to-multipoint, there is the function that sends Frame and receiving data frames, send that Frame is asynchronous with receiving data frames carries out, when receiving data frames, may receive multiple types of data frame, therefore Frame be identified and seemed quite important.
The type of Frame is divided into four kinds conventionally: type one: a business frame; Type two: a grouped data frame; Type three: load frame; Type four: tail frame, wherein, a business frame and a grouped data frame are called again a frame, and a frame is mainly used in communication link and sets up, indicates communication service to start, respond the communication information and other other guides relevant to communication service message that receive; Load frame is mainly used in providing control command and the traffic channel information of data frame transfer; Tail frame is mainly used in the identification data frame end of transmission.
No matter be a frame, load frame, or tail frame, all also including synchronous code and colour coding, in all Frames, synchronous code is identical.
In embodiments of the present invention, because system is used same synchronous code when transmitting, in whole communication process, synchronous code being carried out to synchronous correlator like this can only have at most one simultaneously, has reduced the complexity of system, has saved system resource.
More preferably, receive after Frame, described method also comprises:
Utilize FS to carry out the synchronous judgement of Frame, and be acknowledgement frame when synchronous in judged result, whether the wireless signal frequency configuration of utilizing CC to judge to receive mates with the frequency configuration of self expecting, if so, carries out the operation of specified data frame type; Otherwise, reject this Frame.
Wherein, colour coding is used for distinguishing different digital talk back equipment working frequency points, when working frequency points is identical, the hold facility of receiving terminal and transmitting terminal belong to Same Physical channel, determine that the digital intercom equipment that sends Frame is to be the digital intercom equipment mating with the digital intercom equipment of receiving data frames.
It should be noted that, the Four types that the type of the Frame the present invention relates to is not limited to describe in embodiment, can also be the Frame of other types, is not specifically limited here.
Step 102: the information content of carrying according to described FTC field, determine the type of this Frame.
In step 102, the Frame that step 101 is received is resolved, and determines the information content that the FTC field of carrying in this Frame and FTC field are carried.
Particularly, according to the corresponding relation between the format information of FTC field and data frame type, search data frame type corresponding to the information content that the FTC field that comprises in the described Frame receiving is carried.
For example: the corresponding relation between the format information of setting up FTC field and frame type: 10010110 corresponding frame types one; 01101001 corresponding frame type two; 10100101 corresponding frame types three; 01011010 corresponding frame type four.
Particularly, when finding corresponding frame type, be type a period of time, determine that this Frame is a business frame; When finding corresponding frame type and be type two, the type of determining this Frame is a grouped data frame.
Wherein, a business frame and a grouped data frame are referred to as a frame, and the structure composition of head frame, as shown in Figure 3, is the structural representation of a frame.
Particularly, a frame mainly comprises five parts: leading order code; FS; CC; FTC and HI.
Wherein, a grouped data frame is identical with the frame structure of a business frame, the same structure that adopts a frame of a grouped data frame, and difference is, the HI comprising in a grouped data frame is different from the HI content comprising in a business frame.
It should be noted that, no matter be a business frame, or a grouped data frame, general length is about 80ms, but is not limited to 80ms
When finding corresponding frame type and be type three, the type of determining this Frame is load frame, as shown in Figure 4, is the structural representation of load frame.
Wherein, load frame mainly comprises five parts: FS; CC; FTC; CCH and TCH.
It should be noted that, the length of load frame is about 160ms, but is not limited to 160ms.
When finding corresponding frame type and be type four, the type of determining this Frame is tail frame, as shown in Figure 5, is the structural representation of tail frame.
Wherein, tail frame mainly comprises four parts: FS; CC; FTC; Tail frame data END.
It should be noted that, tail frame is the frame of a shortening, and length is about 30ms, but is not limited to 30ms.
More preferably, when finding corresponding frame type and be type three, the type of determining this Frame is load frame, wherein, and a superframe of at least two load frames compositions.For voice or data service, take superframe as base unit, transmit.
The superframe structure using in the embodiment of the present invention, transmits two CCH fields in two load frames, with respect to dPMR, adopted stronger channel coding method to encode to CCH, has improved the performance of CCH, has improved the error correcting capability of CCH; The length of the synchronous code in load frame is consistent with a frame in addition.In dPMR, the synchronous code length in load frame is the half of a frame, therefore, compared with dPMR, has improved the accuracy of frame synchronization and Timing Synchronization.Based on above-mentioned 2 points, the present invention has improved the probability of success that very important supplementary service of digital intercom equipment " postpones access " greatly.
As shown in Figure 6, be a kind of structural representation of superframe.In equal channel transmission rate situation, meeting under the prerequisite of 3.6kbps vocoded data real-time Transmission, effectively increase the length of synchronous code, thereby improved the accuracy of frame synchronization, improved the demodulation performance of CCH simultaneously.
Finally, according to established data frame type, carry out the corresponding operation of processing.
Particularly, when determining that the data frame type receiving is tail frame, determine that the current Frame receiving is last frame, receive the transmission of rear this data message of end.
A business frame or a grouped data frame, load frame and tail frame are combined into various transfer sequences, by transfer sequence in channel, complete call setup, call out termination, state and confirmation and the mutual of communication service such as reply.
By the scheme of the embodiment of the present invention one, in Frame, increased the frame type coding FTC field for identifying frame type, the information content of carrying by FTC field is identified the type of the Frame receiving, avoided like this utilizing in prior art frame swynchronization code identification data frame type to cause the situation of simultaneously carrying out work at the multiple synchronous determination modules of receiving terminal needs, by detecting the FTC field in Frame, search the type of its information content specified data frame carrying, easy to use and simple, reduced the complexity of receiving device, saved system resource.
Embodiment bis-:
As shown in Figure 7, be a kind of frame type structural representation of locking equipment really of the embodiment of the present invention two, described equipment comprises: receiver module 11 and determination module 12, wherein:
Receiver module 11, for receiving data frames, the information content that has comprised frame type coding FTC field in described Frame and carried;
Particularly, the binary code that described FTC field is N bit; And the information content that described FTC field is carried is bit arrangement pattern in N bit binary code;
Described equipment also comprises: set up module 13, wherein:
Set up module 13, for before receiving data frames, the corresponding relation between bit arrangement pattern and the data frame type of default FTC field.
Described equipment also comprises: search module 14, wherein:
Described determination module 12, specifically for being type a period of time when finding corresponding frame type, determines that this Frame is a business frame; When finding corresponding frame type and be type two, the type of determining this Frame is a grouped data frame; When finding corresponding frame type and be type three, the type of determining this Frame is load frame; When finding corresponding frame type and be type four, the type of determining this Frame is tail frame.
Described determination module 12, specifically also for a superframe of at least two load frame compositions.
Particularly, frame swynchronization code FS and colour coding CC in described Frame, have also been comprised;
Described equipment also comprises: judge module 15, wherein:
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (11)
1. a recognition methods for frame type, is characterized in that, described method comprises:
Receiving data frames, has comprised frame type coding FTC field in described Frame;
The information content of carrying according to described FTC field, determines the type of this Frame.
2. the method for claim 1, is characterized in that, described FTC field is the binary code of N bit; And the information content that described FTC field is carried is bit arrangement pattern in N bit binary code, wherein, N is integer.
3. method as claimed in claim 2, is characterized in that, before receiving data frames, described method also comprises:
Corresponding relation between bit arrangement pattern and the data frame type of default FTC field.
4. the method as described in as arbitrary in claim 1 ~ 3, is characterized in that, after receiving Frame, and the information content of carrying according to described FTC field, before determining the type of this Frame, described method also comprises:
According to the corresponding relation between the bit arrangement pattern of FTC field and data frame type, search data frame type corresponding to the information content that the FTC field that comprises in the described Frame receiving is carried;
The information content of carrying according to described FTC field, determine and specifically comprise the type of this Frame:
When finding corresponding frame type, be type a period of time, determine that this Frame is a business frame; When finding corresponding frame type and be type two, the type of determining this Frame is a grouped data frame; When finding corresponding frame type and be type three, the type of determining this Frame is load frame; When finding corresponding frame type and be type four, the type of determining this Frame is tail frame.
5. method as claimed in claim 4, is characterized in that, the information content of carrying according to described FTC field is determined and specifically also comprised the type of this Frame:
A superframe of at least two load frame compositions.
6. the method for claim 1, is characterized in that, has also comprised frame swynchronization code FS and colour coding CC in described Frame;
Before the information content of carrying according to described FTC field is determined the type of this Frame, described method also comprises:
Utilize FS to carry out the synchronous judgement of Frame, and be acknowledgement frame when synchronous in judged result, whether the wireless signal frequency configuration of utilizing CC to judge to receive mates with the frequency configuration of self expecting, if so, carries out the operation of specified data frame type; Otherwise, reject this Frame.
7. an identification equipment for frame type, is characterized in that, described equipment comprises:
Receiver module, for receiving data frames, has comprised frame type coding FTC field in described Frame;
Determination module, for the information content of carrying according to described FTC field, determines the type of this Frame.
8. equipment as claimed in claim 7, is characterized in that, described FTC field is the binary code of N bit; And the information content that described FTC field is carried is bit arrangement pattern in N bit binary code;
Described equipment also comprises:
Set up module, for before receiving data frames, the corresponding relation between bit arrangement pattern and the data frame type of default FTC field.
9. the equipment as described in as arbitrary in claim 7 ~ 8, is characterized in that, described equipment also comprises:
Search module, for after receiving Frame, the information content of carrying according to described FTC field, before determining the type of this Frame, according to the corresponding relation between the bit arrangement pattern of FTC field and data frame type, search data frame type corresponding to the information content that the FTC field that comprises in the described Frame receiving is carried;
Described determination module, specifically for being type a period of time when finding corresponding frame type, determines that this Frame is a business frame; When finding corresponding frame type and be type two, the type of determining this Frame is a grouped data frame; When finding corresponding frame type and be type three, the type of determining this Frame is load frame; When finding corresponding frame type and be type four, the type of determining this Frame is tail frame.
10. equipment as claimed in claim 9, is characterized in that,
Described determination module, specifically also for a superframe of at least two load frame compositions.
11. equipment as claimed in claim 7, is characterized in that, have also comprised frame swynchronization code FS and colour coding CC in described Frame;
Described equipment also comprises:
Judge module, before determining the type of this Frame for the information content of carrying according to described FTC field, utilize FS to carry out the synchronous judgement of Frame, and be that acknowledgement frame is when synchronous in judged result, whether the wireless signal frequency configuration of utilizing CC to judge to receive mates with the frequency configuration of self expecting, if so, carry out the operation of specified data frame type; Otherwise, reject this Frame.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105634662A (en) * | 2014-11-05 | 2016-06-01 | 扬智科技股份有限公司 | Frame type identification method and device |
| CN106851814A (en) * | 2017-03-03 | 2017-06-13 | 北京泛讯信息技术有限公司 | A kind of frame synchronization detection method and device |
| CN111343148A (en) * | 2020-02-05 | 2020-06-26 | 苏州浪潮智能科技有限公司 | FGPA communication data processing method, system and device |
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| CN105634662B (en) * | 2014-11-05 | 2019-04-05 | 扬智科技股份有限公司 | Frame kind identification method and device |
| CN106851814A (en) * | 2017-03-03 | 2017-06-13 | 北京泛讯信息技术有限公司 | A kind of frame synchronization detection method and device |
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