CN100364250C - Delay compensation method used in mobile communication and its system - Google Patents
Delay compensation method used in mobile communication and its system Download PDFInfo
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- CN100364250C CN100364250C CNB2004100830333A CN200410083033A CN100364250C CN 100364250 C CN100364250 C CN 100364250C CN B2004100830333 A CNB2004100830333 A CN B2004100830333A CN 200410083033 A CN200410083033 A CN 200410083033A CN 100364250 C CN100364250 C CN 100364250C
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Abstract
The present invention relates to mobile communication and discloses a delay compensation method and a system thereof in the mobile communication, which can ensure the synchronization of wireless frames of housing estates in a base station at an antenna port. The delay compensation method used for the mobile communication is characterized in that firstly, the total delay of data transmitting channels of housing estates from a baseband processing unit to the antenna port is obtained, and the delay compensation of an integer level and a fractional level is then carried out due to housing estate data transmitted by the path through the baseband processing unit and an intermediate frequency processing unit respectively.
Description
Technical field
The present invention relates to mobile communication, particularly keep the simultaneous techniques of the radio frames of each sub-district, base station in the mobile communication system in antenna opening.
Background technology
Along with being the high-tech development of sign with the communication technology and computer technology, the great variety of making rapid progress has taken place in people's life, and interpersonal information transmission is more and more closer, mode is also more and more diversified.Mobile communication is exactly that people bring many one of main modes of intelligence transmission easily, and it is still in fast development, to adapt to the needs that the growing high-speed data of people inserts at present.
In mobile communication system, often require the radio frames of each sub-district, base station can keep synchronous in antenna opening, its reason is that the height of synchronous accuracy may influence mobile phone and synchronous receptivity, transmit diversity consistency and the loop transmission delay of a plurality of sub-districts (Round Trip Time is called for short " RTT ") be measured etc.Those of ordinary skill in the art know, with Wideband Code Division Multiple Access (WCDMA) (Wideband CodeDivision Multiple Access, abbreviation " WCDMA ") communication system is an example, radio frames is the chip combinations of stipulating in this agreement, chip is a kind of basic identification of weighing the physical channel time span in the WCDMA system, and the physical channel time span in the WCDMA system identifies with an integer chip usually.For example, a radio frames comprises 15 time slots usually, and each time slot comprises 2560 chips, this shows that a radio frames is made of 38400 chips usually.
But, the radio frames of general each sub-district, base station can not guarantee fully synchronously in antenna opening, main cause is that the descending transmission of data may be via different routing channels, the delay of passage is inconsistent between each processing unit in each routing channel and processing unit, causes last total radio frames to postpone inconsistent.For this problem more clearly is described, make an explanation with reference to Fig. 1 below.
Fig. 1 is the delay schematic diagram of base station each processing unit and the passage between them.As shown in the figure, generally, form first cell data transmission path by baseband processing unit 11, data forwarding unit 12, IF processing unit 120, RF processing unit 121, antenna 122 then by the initial lock in time of timing bus 10 control whole systems.Baseband processing unit 11, data forwarding unit 12, IF processing unit 123, RF processing unit 124, antenna 125 are formed second cell data transmission path.
Wherein T1 represents is the unit channel time of delay of 12 of baseband processing unit 11 and data forwarding unit, T5 is the unit channel time of delay of 120 of data forwarding unit 12 and IF processing units, T9 is the unit channel time of delay of 121 of IF processing unit 120 and RF processing units, and T13 is the unit channel time of delay of 122 on RF processing unit 121 and antenna.
T6 is the unit channel time of delay of 123 of data forwarding unit 12 and IF processing units, T10 is the unit channel time of delay of 124 of IF processing unit 123 and RF processing units, and T14 is the unit channel time of delay of 125 on RF processing unit 124 and antenna.
T17 represents the time of delay of data forwarding unit 12, and T18 and T20 represent the time of delay of IF processing unit 120 and IF processing unit 123 respectively, and T19 and T21 represent the time of delay of RF processing unit 121 and RF processing unit 124 respectively.
The 3rd cell data transmission path is made up of baseband processing unit 13, data forwarding unit 14, IF processing unit 140, RF processing unit 141, antenna 142, and the 4th cell data transmission path is made up of baseband processing unit 13, data forwarding unit 14, IF processing unit 143, RF processing unit 144, antenna 145.
Similar with preceding two cell data transmission paths, T4 represents is the unit channel time of delay of 14 of baseband processing unit 13 and data forwarding unit, T7 is the unit channel time of delay of 140 of data forwarding unit 14 and IF processing units, T11 is the unit channel time of delay of 141 of IF processing unit 140 and RF processing units, and T15 is the unit channel time of delay of 142 on RF processing unit 141 and antenna.
T8 is the unit channel time of delay of 143 of data forwarding unit 14 and IF processing units, T12 is the unit channel time of delay of 144 of IF processing unit 143 and RF processing units, and T16 is the unit channel time of delay of 145 on RF processing unit 144 and antenna.
T22 represents the time of delay of data forwarding unit 14, and T23 and T25 represent the time of delay of IF processing unit 140 and IF processing unit 143 respectively, and T24 and T26 represent the time of delay of RF processing unit 141 and RF processing unit 144 respectively.
In fact also there is passage 14 of baseband processing unit 11 and data forwarding unit, and T2 just represents the channel delay time of the two, and in like manner also there is passage 12 of baseband processing unit 13 and data forwarding unit, and T3 just represents the channel delay time of the two.Can also be combined into more cell data transmission paths thus.
This shows, because sending, data downstream has different paths, and the delay of different processing units also may be different, even the cell data transmission path that is connected below same baseband processing unit and the data forwarding unit, the time of delay of passage is also incomplete same between each processing unit and processing unit.The explanation that gives some instances, what the dotted line among the figure was represented is the different districts data transmission path of data.Cell data transmission path 15 and cell data transmission path 17, though pass through same baseband processing unit 11 and data forwarding unit 12 simultaneously, but cell data transmission path 15 back processes is IF processing unit 120, RF processing unit 121, antenna 122, cell data transmission path 17 back processes be IF processing unit 123, RF processing unit 124, antenna 125, article two, interchannel delay difference all can cause the total delay of the routing channel 15 and the radio frames of routing channel 17 different between any one processing unit in the middle of the different routes or processing unit.And pass through baseband processing unit 13 and data forwarding unit 12 jointly, separately separately through the cell data transmission path 16 of IF processing unit 120, RF processing unit 121, antenna 122 with pass through the cell data transmission path 18 of IF processing unit 123, RF processing unit 124, antenna 125 separately, compare the different situation of total delay that equally also can run into radio frames again with two the cell data transmission paths in front.
At the problem that proposes above, be appreciated that, need take certain measure to reach synchronous in the radio frames of each sub-district of antenna opening, to guarantee synchronous receptivity and the transmit diversity consistency of mobile phone to a plurality of sub-districts, and ensure that RTT measures, but up to the present comparatively gratifying solution was not proposed as yet.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of delay compensation method and system thereof that is used for mobile communication, the radio frames that makes it possible to guarantee each sub-district, base station antenna opening synchronously.
For achieving the above object, the invention provides a kind of delay compensation method that is used for mobile communication, comprise following steps:
Obtain the total delay separately of each cell data transmission path from the baseband processing unit to the antenna opening; Baseband processing unit and IF processing unit are carried out delay compensation according to the total delay separately of described data transmission path to the cell data by the respective channels transmission.
Wherein, described baseband processing unit is unit with the chip, and described cell data is carried out the delay compensation of integer level, and described IF processing unit is unit with the chip, described cell data is carried out the delay compensation of mark level.
Described baseband processing unit carries out the delay compensation of integer level by shift register group.
Described IF processing unit is carried out the delay compensation of mark level by shift register group, and the clock of wherein said shift register group is higher than the speed of chip.
Described IF processing unit is carried out the delay compensation of mark level by digital filter.
The present invention also provides a kind of delay compensation system, comprise baseband processing unit, data forwarding unit, IF processing unit, RF processing unit and the antenna successively cell data handled, described baseband processing unit and described IF processing unit also comprise delay compensating circuit, are used to compensate the total delay of each cell data transmission path from described baseband processing unit to antenna opening that measures in advance.
Wherein, it is unit that the delay compensating circuit in the described baseband processing unit is used for the chip, carries out the delay compensation of integer level; It is unit that delay compensating circuit in the described IF processing unit is used for the chip, carries out the delay compensation of mark level.
Delay compensating circuit in the described baseband processing unit is made of shift register group.
Delay compensating circuit in the described IF processing unit is made of shift register group, and wherein the clock of this shift register group is higher than the speed of chip.
Delay compensating circuit in the described IF processing unit is made of digital filter.
By relatively finding, technical scheme difference with the prior art of the present invention is, total delay according to predetermined each cell data transmission path from the baseband processing unit to the antenna opening, carry out the delay compensation of integer level by baseband processing unit, carry out the delay compensation of mark level by IF processing unit.
Difference on this technical scheme has brought comparatively significantly beneficial effect, promptly realizes the synchronous purpose of the radio frames of each sub-district, base station in antenna opening preferably.
Description of drawings
Fig. 1 is the delay schematic diagram of passage between prior art base station each processing unit and processing unit;
Fig. 2 is a delay compensation flow chart according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Generally speaking, principle of the present invention is: by carrying out the delay compensation of integer level in baseband processing unit, and the delay compensation of carrying out the mark level in IF processing unit, realize that each sub-district radio frames of antenna opening of base station is synchronous.
For the radio frames that guarantees each sub-district, base station wireless mouthful synchronously, the present invention implements complete technical solution according to three big steps.Describe in detail below in conjunction with Fig. 1 and Fig. 2.
At first, in step 200, the overall channel that obtains from the baseband processing unit to the antenna opening postpones.Specifically, be subdivided into two sub-steps again.
First substep is by design constraint, measures and delay that mode such as data configuration is obtained transmission channel between each processing unit and processing unit in real time.With Fig. 1 is example, in this substep, accurately obtain each numerical value from T1 to T26.
In ensuing second sub-steps, determine the total delay of each the cell data transmission path from the baseband processing unit to the antenna opening.Still be example with Fig. 1, if cell data transmission path 15, then total delay is T1, T17, T5, T18, T9, T19, T13 sum; The total delay of cell data transmission path 16 then is T3, T17, T5, T18, T9, T19, T13 sum; The total delay of cell data transmission path 17 is T1, T17, T6, T20, T10, T21, T14 sum; The total delay of cell data transmission path 18 is T3, T18, T6, T20, T10, T21, T14 sum.
If also have other routing channel, just can obtain the total delay of corresponding cell data transmission path by the delay addition of transmission channel between the each processing unit of its process and processing unit.
After the total delay that has obtained each the cell data transmission path from the baseband processing unit to the antenna opening, next procedure is exactly the compensation to each sub-district channel delay.Compensation need be finished with IF processing unit by baseband processing unit, total implementation method is for to send each cell data on demand in advance at baseband processing unit, lead approximates the total delay of each cell data sendaisle, last radio frames arrives the time basic synchronization of antenna opening, and promptly baseband processing unit is finished the coarse adjustment function of delay compensation.After this, IF processing unit is finished the fine adjustment function that each sub-district postpones.Below with reference to Fig. 2, be elaborated.
In step 210, baseband processing unit is finished the coarse adjustment of delay compensation.In this step, baseband processing unit is finished the delay compensation of integer level.Below with reference to Fig. 1, the delay compensation process of integer level is described.In Fig. 1, the data forwarding unit often occupy in the middle of baseband processing unit and the IF processing unit, it works in data link layer, function is the data of a plurality of sub-districts to be carried out framing conciliate the frame operation, therefore be benchmark with the downstream data flow, being positioned at the unit that baseband processing unit time of carrying out of its front adjusts should be the least unit of data forwarding unit to the data combination of many sub-districts framing.
As mentioned above, with the WCDMA system is example, data combination for data forwarding processing unit framing, a chip is its least unit, therefore baseband processing unit is when delay compensation sends in advance, the unit of compensation also should be the time of a chip, and this is the delay compensation that the compensation of unit is commonly referred to be the integer level with the chip.
The concrete integer level delay compensation of baseband processing unit realizes it being to handle by sequential logic, in the present embodiment, is to finish by shift register group to postpone to handle.Above-mentioned shift register has memory function and shift function, owing to often use shifting function in digital system, therefore if desired, shift register can be realized flowing into the control of data, the data flow that output needs by storage and displacement.
In general, the clock cycle that is positioned at the shift register employing on the baseband processing unit equals chip period, only needs just can realize shift register delay clock cycle of output so adjust the time span of a chip units.In some cases, might use clock frequency higher by shift register, a chip period equaled for several clock cycle, and this moment is just passable as long as shift register postpones several bats more.
After this enter step 220, realize IF processing unit delay compensation fine setting, promptly finish the delay compensation of mark level.
The delay compensation process of mark level is described below with reference to Fig. 1.At first need explanation, in some cases, the compensation unit of above-mentioned baseband processing unit is not the time of a chip.Specifically, because the framing of data forwarding unit operation, be easy to cause extra error, because the carrying signal burst length of each data bit also is not equal to a chip, a plurality of data bits are combined into radio frames, and the cell processing time delay time that just may cause the data forwarding unit is not to be the time value of base unit with the chip.
In this case, the compensation of mark level need be placed in the data cell IF processing unit thereafter and finish.The compensation of the concrete fractional stage delay of IF processing unit is implemented under the not high situation of required precision, and is similar with the delay compensation of baseband processing unit integer level, all is to handle by the shift register sequential logic above separately, promptly by postponing to handle realization.What the two was different is, on the IF processing unit the time shift register clock rate generally be more than 10 times of spreading rate, or even tens times.Obviously, the time degree that the may command delay is handled is more much higher than baseband processing unit, so can realize the mark level compensation littler than chip chronomere.If the compensation precision that requires is higher, IF processing unit can also realize by the mode that digital filter carries out filtering operation to digital signal, the precision of delay compensation this moment can reach several centesimal chip period, and the time degree that the may command delay is handled is just more accurate.
Below as can be seen, there have been step 21 and step 22 to cooperate the time delay equalization that realizes, each cell data transmission path is no matter the total delay of any basic time unit occurs, baseband processing unit on the whole piece path and IF processing unit can both compensate accurately to it, send data in advance, make the radio frames that arrives antenna opening separately synchronous, synchronization basic standard is at last all with reference to time of the timing bus 10 among Fig. 1.
In another embodiment, a kind of delay compensation system has been proposed according to principle of the present invention.Because the principle of this system is identical with above-mentioned delay compensation method basically, therefore only the distinctive technology of this system is described and explains herein.
The delay compensation system of present embodiment comprises baseband processing unit, data forwarding unit, IF processing unit, RF processing unit and the antenna of successively cell data being handled.The present embodiment difference with the prior art is, also comprises respectively in baseband processing unit and the IF processing unit to be used to compensate to measure from the baseband processing unit to the antenna opening delay compensating circuit of the total delay of big each cell data transmission path in advance.Wherein, the delay compensating circuit in the baseband processing unit carries out the compensation of integer level, and the delay compensating circuit in the IF processing unit carries out the compensation of mark level.
When cell data through out-of-date, the delay compensating circuit in the baseband processing unit is that unit carries out the delay compensation of integer level with the chip, wherein, this delay compensating circuit is made of shift register group; Delay compensating circuit in the IF processing unit is the delay compensation that unit carries out the mark level with the chip, and wherein, this delay compensating circuit is made of shift register group, and its clock is higher than the speed of chip.In another embodiment of the present invention, shift register group is made of digital filter.Thus, native system is by the integer level delay compensation of baseband processing unit, and the compensation of the fractional stage delay of IF processing unit, realizes making the radio frames of each sub-district, base station in the synchronous purpose of antenna opening.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (10)
1. a delay compensation method that is used for mobile communication is characterized in that, comprises following steps:
Obtain the total delay separately of each cell data transmission path from the baseband processing unit to the antenna opening;
Baseband processing unit and IF processing unit are carried out delay compensation according to the total delay separately of described cell data transmission path to the cell data by the respective channels transmission.
2. the delay compensation method that is used for mobile communication according to claim 1, it is characterized in that, described baseband processing unit is unit with the chip, described cell data is carried out the delay compensation of integer level, described IF processing unit is unit with the chip, described cell data is carried out the delay compensation of mark level.
3. the delay compensation method that is used for mobile communication according to claim 2 is characterized in that, described baseband processing unit carries out the delay compensation of integer level by shift register group.
4. according to claim 2 or the 3 described delay compensation methods that are used for mobile communication, it is characterized in that described IF processing unit is carried out the delay compensation of mark level by shift register group, the clock of wherein said shift register group is higher than the speed of chip.
5. according to claim 2 or the 3 described delay compensation methods that are used for mobile communication, it is characterized in that described IF processing unit is carried out the delay compensation of mark level by digital filter.
6. a delay compensation system that is used for mobile communication comprises baseband processing unit, data forwarding unit, IF processing unit, RF processing unit and the antenna successively cell data handled, it is characterized in that,
Described baseband processing unit and described IF processing unit also comprise delay compensating circuit, are used to compensate the total delay separately of each cell data transmission path from described baseband processing unit to antenna opening that measures in advance.
7. delay compensation according to claim 6 system is characterized in that it is unit that the delay compensating circuit in the described baseband processing unit is used for the chip, carries out the delay compensation of integer level; It is unit that delay compensating circuit in the described IF processing unit is used for the chip, carries out the delay compensation of mark level.
8. delay compensation according to claim 7 system is characterized in that the delay compensating circuit in the described baseband processing unit is made of shift register group.
9. according to claim 7 or 8 described delay compensation systems, it is characterized in that the delay compensating circuit in the described IF processing unit is made of shift register group, wherein the clock of this shift register group is higher than the speed of chip.
10. according to claim 7 or 8 described delay compensation systems, it is characterized in that the delay compensating circuit in the described IF processing unit is made of digital filter.
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| CNB2004100830333A CN100364250C (en) | 2004-09-23 | 2004-09-23 | Delay compensation method used in mobile communication and its system |
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| CN101789822B (en) * | 2010-02-03 | 2012-11-21 | 深圳市海思半导体有限公司 | Uplink and downlink frame timing method of baseband chip multiple carrier sectors, baseband chip and system |
| EP2667683B1 (en) | 2012-05-25 | 2015-04-01 | Alcatel Lucent | Method for operating a network element of a wireless communication network and network element |
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| WO1998004052A1 (en) * | 1996-07-18 | 1998-01-29 | Ericsson Inc. | System and method for equalizing the delay time for transmission paths in a distributed antenna network |
| WO2000059159A1 (en) * | 1999-03-31 | 2000-10-05 | Adaptive Broadband Ltd. | Method and system for baseband delay compensation |
| CN1272268A (en) * | 1997-09-30 | 2000-11-01 | 摩托罗拉公司 | Method and apparatus for correcting measured round-trip delay time in wireless communication system |
| US20030125897A1 (en) * | 2000-07-27 | 2003-07-03 | Koichi Higashide | Semiconductor device testing apparatus having timing calibration function |
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| WO1998004052A1 (en) * | 1996-07-18 | 1998-01-29 | Ericsson Inc. | System and method for equalizing the delay time for transmission paths in a distributed antenna network |
| CN1272268A (en) * | 1997-09-30 | 2000-11-01 | 摩托罗拉公司 | Method and apparatus for correcting measured round-trip delay time in wireless communication system |
| WO2000059159A1 (en) * | 1999-03-31 | 2000-10-05 | Adaptive Broadband Ltd. | Method and system for baseband delay compensation |
| US20030125897A1 (en) * | 2000-07-27 | 2003-07-03 | Koichi Higashide | Semiconductor device testing apparatus having timing calibration function |
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Non-Patent Citations (1)
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| 一种数字延迟补偿方法. 刘祖干，罗国钦.声学与电子工程，第3期. 1987 * |
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