CN103152304A - Digital private mobile radio (DPMR) late entry method and device - Google Patents
Digital private mobile radio (DPMR) late entry method and device Download PDFInfo
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- CN103152304A CN103152304A CN2011104051314A CN201110405131A CN103152304A CN 103152304 A CN103152304 A CN 103152304A CN 2011104051314 A CN2011104051314 A CN 2011104051314A CN 201110405131 A CN201110405131 A CN 201110405131A CN 103152304 A CN103152304 A CN 103152304A
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Abstract
The invention provides a digital private mobile radio (DPMR) late entry method which comprises the steps: A, receiving at least two parts of radio frame data; B, cutting out the data to form to-be-detected data in a sliding mode, and conducting correlation processing on combined synchronization sequences of the to-be-detected data to obtain a plurality of correlation values; C, comparing a maximum correlation value of obtained correlation values which conduct correlation processing with a first combined synchronization sequence and a maximum correlation value of obtained correlation values which conduct correlation processing with a second combined synchronization sequence; if the larger of the maximum correlation values is greater than a set threshold value, entering the step D, or, returning back to the step A; and D, confirming that a corresponding synchronization position of the larger maximum correlation value is an accessed synchronization position and carrying out synchronization access. According to the method, frame sync 2 (Fs2) and a color code (CC) are utilized to detect the synchronization access of an interphone, and accuracy and noise immunity are improved compared with that only the Fs2 or the CC is adopted to detect the synchronization access of the interphone. The invention further provides a corresponding device.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of dPMR and postpone cut-in method and device.
Background technology
The Digital Clustering mobile communication system is one of Hot spots for development of moving communicating field, have and continue soon, the advantages such as networking flexibility are mainly used in the dedicated mobile communications subsystems such as production scheduling, commander's control, and production and operating efficiency, assurance safety etc. are significant for improving.
DPMR (the private mobile radio of Digital Private Mobile Radio numeral) intercom is used on Europe and other places widely as a kind of digital intercom machine technology of maturation.Its frame structure has four kinds, is respectively four kinds of load frames, superframe, a frame and tail frames.The structure of each superframe as shown in Figure 1,1 superframe comprises 4 radio frames, the front 24bit of each radio frames is Fs2 (FrameSync2 frame synchronization 2) or CC (ColourCode colour coding).And the front 24bit in the 1st, 3 radio frames of superframe is frame synchronization 2, and the front 24bit of the 2nd, 4 radio frames of superframe is colour coding.
Postponing access (late entry) is the typical application technology of dPMR equipment.Postpone access, namely just access after communication process begins a period of time.The existing Access Algorithm that postpones access utilizes Fs2 or CC synchronously to access usually.Basic access process is as shown in Figure 2:
Step S201, digital handset receives 1 frame data.
Step S202, digital handset obtains the correlation of each slip with the Fs2 of self storage or CC and the data that the receive relevant treatment of sliding by processing.
Step S203, digital handset select maximum related value in the correlation that obtains through the slip relevant treatment and the threshold value of setting is made comparisons, if greater than threshold value, enter step S204; Otherwise continue to receive 1 frame data.
Step S204 begins synchronous access from sync bit corresponding to maximum related value.
Existing algorithm utilizes Fs2 or CC as synchronizing sequence usually.The length of Fs2 or CC only has 24bit (bit), when the FS2 of use 24bit or CC slide relevant treatment, because character length is shorter, auto-correlation and cross correlation are not ideal, especially under the lower scene of signal to noise ratio due to the randomness of the pseudo-random characteristics of noise and other business datum that may exist, can produce comparatively serious void inspection (i.e. wrong access) or undetected (not detecting when access message namely should be detected), the correctness and the noise immunity that make synchronous access detect are all lower.When this situation is nonideal in the radio-frequency channel, impact can be more obvious, such as adopting 4FSK frequency modulation because of dPMR, the difference of the locking frequency deviation that the unsteadiness of receiving terminal or transmitting terminal VCO (voltage controlled oscillator) causes can become unsettled DC quantity after the receiving terminal frequency discrimination, the correlation that the existence of this situation can affect Fs2 or CC more compares.
Summary of the invention
DPMR provided by the invention postpones cut-in method, has solved the situation that can occur empty inspection when only utilizing Fs2 or CC to carry out correlated judgment and synchronous access, has improved correctness and noise immunity that synchronous access detects.
Method provided by the invention is:
A, receive at least two wireless frame data at least;
In the data that B, the intercepting of sliding receive, identical with the first synchronizing sequence length and identical with the second synchronizing sequence length two-part data form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the first combined synchronization sequence of described data to be checked and the first synchronizing sequence and the second synchronizing sequence composition and is obtained a plurality of correlations;
And two-part data identical with the second synchronizing sequence length and identical with the first synchronizing sequence length in the data that the intercepting of sliding receives form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the second combined synchronization sequence of described data to be checked and the second synchronizing sequence and the first synchronizing sequence composition and is obtained a plurality of correlations;
C, comparison and the first combined synchronization sequence are carried out the maximum related value in correlation that relevant treatment obtains and are carried out maximum related value in the relevant correlation that obtains with the second combined synchronization sequence; If wherein larger maximum related value greater than the threshold value of setting, enters step D, otherwise returns to steps A;
D, definite larger sync bit corresponding to maximum related value are the sync bit that enters, and carry out synchronous access.
The first synchronizing sequence and the second synchronizing sequence are respectively frame synchronization 2Fs2 and colour coding CC.
The present invention also provides a kind of device, and this device comprises:
Receiver module is used for receiving at least two wireless frame data; If larger maximum related value is not more than the threshold value of setting, receive at least two wireless frame data.
The slip related process module, be used for identical with the first synchronizing sequence length and identical with the second synchronizing sequence length a plurality of data to be checked of two-part data composition of data that the slip intercepting receives, wherein, two-part data break one radio frames is carried out relevant treatment with the first combined synchronization sequence of described data to be checked and the first synchronizing sequence and the second synchronizing sequence composition and is obtained a plurality of correlations;
And two-part data identical with the second synchronizing sequence length and identical with the first synchronizing sequence length in the data that the intercepting of sliding receives form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the second combined synchronization sequence of described data to be checked and the second synchronizing sequence and the first synchronizing sequence composition and is obtained a plurality of correlations;
Comparison module is used for relatively and the first combined synchronization sequence is carried out the maximum related value of a plurality of correlations that relevant treatment obtains and carries out maximum related value in a plurality of correlations that relevant treatment obtains with the second combined synchronization sequence;
Access module if be used for wherein larger maximum related value greater than the threshold value of setting, is determined that larger sync bit corresponding to maximum related value is the sync bit that enters, and is carried out access.
The first synchronizing sequence and the second synchronizing sequence are respectively frame synchronization 2Fs2 and colour coding CC.
The present invention utilizes Fs2 and CC that the synchronous access of intercom is detected simultaneously, than only with Fs2 or CC, accuracy and the noise immunity that the synchronous access of intercom detects all being increased.And can reduce significantly empty inspection and undetected probability, the improving product performance.
Description of drawings
Fig. 1 is the structural representation of superframe in prior art of the present invention;
Fig. 2 is art methods flow chart of the present invention;
Fig. 3 is the method flow diagram of embodiments of the invention;
Fig. 4 is the apparatus structure schematic diagram of the embodiment of the present invention.
Embodiment
The situation that can occur empty inspection when only utilizing Fs2 or CC to carry out correlated judgment and synchronous access for solution, and whether the data that make judgement more accurately receive are correlated with and find sync bit, as shown in Figure 3, the delay access scheme of the embodiment of the present invention is:
Step S301, device receive at least two wireless frame data at least.
In the present embodiment, all carry out correlation detection to two kinds of synchronizing sequences, according to superframe structure, the data that need to receive at least two radio frames just can comprise complete Fs2 and CC.Two wireless frame data are 160ms.In order to guarantee the integrality of data, can increase according to circumstances certain redundancy on the basis of 160ms.
Step S302, two-part data identical with the first synchronizing sequence length and identical with the second synchronizing sequence length in the data that the intercepting of sliding receives form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the first combined synchronization sequence of described data to be checked and the first synchronizing sequence and the second synchronizing sequence composition and is obtained a plurality of correlations;
And two-part data identical with the second synchronizing sequence length and identical with the first synchronizing sequence length in the data that the intercepting of sliding receives form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the second combined synchronization sequence of described data to be checked and the second synchronizing sequence and the first synchronizing sequence composition and is obtained a plurality of correlations.
To access after the conversation beginning owing to postponing access, thus position that can not determine access from where.Due to dividing of the free priority of synchronizing sequence, therefore should intercept respectively according to different orders, formed a plurality of data to be checked so both needed to intercept identical with the first synchronizing sequence length and identical with the second synchronizing sequence length two-part data, and also needed to intercept identical with the second synchronizing sequence length and identical with the first synchronizing sequence length two-part data and form a plurality of data to be checked.In order to carry out relevant treatment with the combined synchronization sequence, need to be according to the identical data of length difference intercepted length of the first synchronizing sequence and the second synchronizing sequence.And notice the character of data itself when intercepting, an interval of setting is namely arranged in the middle of the part corresponding with two sequences, when therefore intercepting two parts data form the associating data when intercepting, also should intercept spaced two parts.Because being synchronously detects, so therefore the detection of can sliding, also can be carried out data and slide when intercepting, every intercepting one secondary data is carried out data and is slided, then data intercept, obtains at last a plurality of data to be checked.Need with to be checked both with the first combined synchronization sequence of the first synchronizing sequence formerly with the second synchronizing sequence at rear composition, carry out respectively relevant treatment with the second synchronizing sequence formerly with the first synchronizing sequence in the second combined synchronization sequence of rear composition again.And relevant treatment is that data to be checked and combined synchronization sequence are carried out correlation computations.
Step S303 relatively carries out the maximum related value in a plurality of correlations that relevant treatment obtains and carries out maximum related value in a plurality of correlations that relevant treatment obtains with the second combined synchronization sequence with the first combined synchronization sequence, draws larger maximum related value.The slip data intercept can obtain a plurality of data to be checked, and a plurality of data to be checked and combined synchronization sequence can obtain a plurality of correlations when carrying out relevant treatment.Can obtain a plurality of correlations so carry out relevant treatment with the first combined synchronization sequence that forms with the first synchronizing sequence and the second synchronizing sequence, the second combined synchronization sequence that forms with the second synchronizing sequence and the first synchronizing sequence is carried out relevant treatment and also can be obtained a plurality of correlations.
Will with the first combined synchronization Serial relation process in a plurality of correlations obtain maximum related value and with the second combined synchronization Serial relation process in a plurality of correlations that obtain maximum related value relatively, draw a larger correlation.Correlation that will be larger and the threshold value of setting are made comparisons.
Whether step S304 judges larger maximum related value greater than the threshold value of setting, if wherein larger maximum related value greater than the threshold value of setting, enters step S305; Otherwise return to step S301.
The size of the larger maximum that relatively draws and the threshold value of setting, if greater than threshold value, confirm that larger sync bit corresponding to maximum related value is the sync bit of intercom access, enter step S305, otherwise need receive data again, the flow process that restarts to detect is namely returned to step S301.
Step S305 determines that larger sync bit corresponding to maximum related value is the sync bit that enters, and carries out synchronous access.
The sync bit corresponding according to larger maximum related value can be determined the sync bit of intercom access, just can begin access data.
In the present embodiment, the first synchronizing sequence and the second synchronizing sequence are respectively Fs2 and CC.
The technical scheme of the present embodiment is not only applicable to the dPMR system, also be applicable to the dPMR system class seemingly, also adopt the other system of synchronizing sequence structure spaced apart.
The scheme that adopts the present embodiment to provide can utilize Fs2 and CC all the data that receive synchronously to be detected, with respect to a situation with Fs2 or CC, both improved the correctness of synchronous detection, strengthened again the antinoise ability that synchronous access detects, can reduce significantly empty inspection and undetected probability, the improving product performance.
The present invention also provides the device corresponding with method, describes below in conjunction with the structure of accompanying drawing to device.As shown in Figure 4, device comprises: receiver module 41, slip related process module 42, comparison module 43 and access module 44.
Slip related process module 42 is used for identical with the first synchronizing sequence length and identical with the second synchronizing sequence length a plurality of data to be checked of two-part data composition of data that the slip intercepting receives, wherein, two-part data break one radio frames is carried out relevant treatment with the first combined synchronization sequence of described data to be checked and the first synchronizing sequence and the second synchronizing sequence composition and is obtained a plurality of correlations; And two-part data identical with the second synchronizing sequence length and identical with the first synchronizing sequence length in the data that the intercepting of sliding receives form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the second combined synchronization sequence of described data to be checked and the second synchronizing sequence and the first synchronizing sequence composition and is obtained a plurality of correlations.
The maximum related value of the correlation that relevant treatment that comparison module 43 is used for relatively and the first synchronizing sequence slides obtains and with slide maximum related value in the correlation that relevant treatment obtains of the second synchronizing sequence.
If access module 44 is used for wherein larger maximum related value greater than the threshold value of setting, determines that larger sync bit corresponding to maximum related value is the sync bit that enters, and carry out access.
In the present embodiment, the first synchronizing sequence and the second synchronizing sequence are respectively Fs2 and CC.
The technical scheme of the present embodiment is not only applicable to the dPMR system, also be applicable to the dPMR system class seemingly, also adopt the other system of synchronizing sequence structure spaced apart.
The scheme that adopts the present embodiment to provide can utilize Fs2 and CC all the data that receive synchronously to be detected, with respect to a situation with Fs2 or CC, both improved the correctness of synchronous detection, strengthened again the antinoise ability that synchronous access detects, can reduce significantly empty inspection and undetected probability, the improving product performance.
Obviously, those skilled in the art can carry out various changes and modification and not break away 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 claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (4)
1. a dPMR postpones cut-in method, it is characterized in that, the method comprises:
A, receive at least two wireless frame data at least;
In the data that B, the intercepting of sliding receive, identical with the first synchronizing sequence length and identical with the second synchronizing sequence length two-part data form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the first combined synchronization sequence of described data to be checked and the first synchronizing sequence and the second synchronizing sequence composition and is obtained a plurality of correlations;
And two-part data identical with the second synchronizing sequence length and identical with the first synchronizing sequence length in the data that the intercepting of sliding receives form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the second combined synchronization sequence of described data to be checked and the second synchronizing sequence and the first synchronizing sequence composition and is obtained a plurality of correlations;
C, comparison and the first combined synchronization sequence are carried out the maximum related value in a plurality of correlations that relevant treatment obtains and are carried out maximum related value in the relevant a plurality of correlations that obtain with the second combined synchronization sequence; If wherein larger maximum related value greater than the threshold value of setting, enters step D, otherwise returns to steps A;
D, definite larger sync bit corresponding to maximum related value are the sync bit that enters, and carry out synchronous access.
2. method according to claim 1, is characterized in that, described the first synchronizing sequence and the second synchronizing sequence are respectively frame synchronization 2Fs2 and colour coding CC.
3. a device, is characterized in that, this device comprises:
Receiver module is used for receiving at least two wireless frame data; If relatively with the first combined synchronization sequence slide in a plurality of correlations that relevant treatment obtains maximum related value and with slide maximum related value in a plurality of correlations that relevant treatment obtains of the second combined synchronization sequence, the larger maximum related value that obtains is not more than the threshold value of setting, receives at least two wireless frame data;
The slip related process module, be used for identical with the first synchronizing sequence length and identical with the second synchronizing sequence length a plurality of data to be checked of two-part data composition of data that the slip intercepting receives, wherein, two-part data break one radio frames, the first combined synchronization sequence of described data to be checked and the first synchronizing sequence and the second synchronizing sequence composition is carried out relevant treatment obtains a plurality of correlations;
And two-part data identical with the second synchronizing sequence length and identical with the first synchronizing sequence length in the data that the intercepting of sliding receives form a plurality of data to be checked, wherein, two-part data break one radio frames is carried out relevant treatment with the second combined synchronization sequence of described data to be checked and the second synchronizing sequence and the first synchronizing sequence composition and is obtained a plurality of correlations;
Comparison module is used for relatively and the first combined synchronization sequence is carried out the maximum related value of a plurality of correlations that relevant treatment obtains and carries out maximum related value in a plurality of correlations that relevant treatment obtains with the second combined synchronization sequence;
Access module, if be used for relatively and the first combined synchronization sequence slide a plurality of correlations that relevant treatment obtains maximum related value and with slide maximum related value in a plurality of correlations that relevant treatment obtains of the second combined synchronization sequence, the larger maximum related value that obtains is greater than the threshold value of setting, determine that larger sync bit corresponding to maximum related value is the sync bit that enters, and carry out access.
4. device according to claim 3, is characterized in that, the first synchronizing sequence and the second synchronizing sequence are respectively frame synchronization 2Fs2 and colour coding CC.
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Cited By (1)
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| CN105897960A (en) * | 2015-08-08 | 2016-08-24 | 深圳市万博鑫科技有限公司 | Three proofing intelligent DMR/DPMR digital intercommunication anti-glare mobile phone |
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| CN1954526A (en) * | 2004-02-05 | 2007-04-25 | 皇家飞利浦电子股份有限公司 | Mehtod and apparatus for synchronization over 802.3AF |
| CN101035327A (en) * | 2007-04-13 | 2007-09-12 | 华为技术有限公司 | Radio communication system and air interface synchronization method, base station and its controller |
| WO2011061167A1 (en) * | 2009-11-17 | 2011-05-26 | Detracom | Method for a relay suitable for operating in digital and analogue mode |
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| JP2004044457A (en) * | 2002-07-10 | 2004-02-12 | Nissan Motor Co Ltd | Exhaust emission control device of internal combustion engine |
| CN1954526A (en) * | 2004-02-05 | 2007-04-25 | 皇家飞利浦电子股份有限公司 | Mehtod and apparatus for synchronization over 802.3AF |
| CN101035327A (en) * | 2007-04-13 | 2007-09-12 | 华为技术有限公司 | Radio communication system and air interface synchronization method, base station and its controller |
| WO2011061167A1 (en) * | 2009-11-17 | 2011-05-26 | Detracom | Method for a relay suitable for operating in digital and analogue mode |
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