CN101197588B - Pilot symbols transmission method and device for radio communication system - Google Patents
Pilot symbols transmission method and device for radio communication system Download PDFInfo
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- CN101197588B CN101197588B CN2007101610828A CN200710161082A CN101197588B CN 101197588 B CN101197588 B CN 101197588B CN 2007101610828 A CN2007101610828 A CN 2007101610828A CN 200710161082 A CN200710161082 A CN 200710161082A CN 101197588 B CN101197588 B CN 101197588B
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Abstract
The invention provides a pilot symbol sending method for a wireless communication system and apparatus thereof, if the length of UpPTS is of L symbols, which comprises long CP or short CP, the method comprises the following steps: when L is less than M symbols, and 0 is less than M, pilot symbols is not transmitted in the UpPTS; when L is more than or equal to M and less than or equal to N symbols, one pilot symbol is transmitted in the UpPTS; and when L is more than N symbols, two pilot symbols are transmitted in the UpPTS, wherein, for the long CP symbols, 0 is less than M, N is more than 0 and less than or equal to 11; for the short CP symbols, 0 is less than M, 0 is less than N is more than 0 and less than or equal to 13. The invention can reasonably determine the quantity and positions of pilot symbols in the UpPTS.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of pilot symbols transmission method for wireless communication system and device.
Background technology
The frame structure of LTE (Long Term Evolution, Long Term Evolution) system TDD (Time DivisionDuplex, time division duplex) pattern, as shown in Figure 1.In this frame structure, the radio frames of a 10ms is divided into two fields, it is 0.5ms time slot (numbering from 0 to 9) that each field is divided into 10 length, and two time slots form the subframe that length is 1ms, comprises 5 subframes (numbering from 0 to 4) in the field.Be the short CP (Cyclic Prefix, Cyclic Prefix) of 5.21us and 4.69us for length, the symbol that it is 66.7us that time slot comprises 7 length, wherein first symbol CP length is 5.21us, the CP length of all the other 6 symbols is 4.69us; Be the long CP of 16.67us for length, a time slot comprises 6 symbols.In addition, in this frame structure, the preparation characteristics of subframe are:
Subframe 1 (hereinafter referred to as special subframe) comprises 3 special time slots; respectively DwPTS (Downlink Pilot Time Slot; descending pilot frequency time slot), GP (Guard Period; protection period) and UpPTS (Uplink Pilot Time Slot, uplink pilot time slot).Wherein,
↑ DwPTS is used for descending, a minimum symbol is used for transmission primary synchronization channel P-SCH (Primary-Synchronization Channel, primary synchronization channel), when DwPTS comprised a plurality of symbol, P-SCH was placed on (as shown in Figure 1) on first symbol;
↑ GP is guard time, does not transmit any data;
↑ UpPTS is used for up, can be used for transmission RACH (Random AccessChannel, Random Access Channel), data, the signals such as sounding (detection) pilot tone.
Front n subframe of subframe 1 back is used for uplink (1≤n≤3), and a rear 3-n subframe is used for downlink transfer.
The preparation of another field can be identical with previous field, can be descending sub frame entirely also, transmitting downlink data.
For the reception of data in the UpPTS, at first need to utilize pilot tone to carry out channel estimating, and then carry out demodulation according to the channel status that estimates.The symbol that pilot tone accounts for is more, and channel estimating is more accurate, and receptivity is better, but expense is also larger; Otherwise the symbol that pilot tone accounts for is fewer, and channel estimating is more inaccurate, and receptivity is poorer, but expense is also less.Because the length of UpPTS is variable, therefore need rational method of design to determine quantity and the position of the interior frequency pilot sign of UpPTS (can referred to as pilot tone), receive reliably under the prerequisite of the data in the UpPTS guaranteeing, make expense reach minimum.
Summary of the invention
The present invention aims to provide a kind of pilot symbols transmission method for wireless communication system and device, can reasonably determine quantity and the position of frequency pilot sign in the UpPTS.
According to an aspect of the present invention, provide a kind of pilot symbols transmission method for wireless communication system, if the length of UpPTS is L symbol, symbol comprises long CP or short CP, may further comprise the steps: when L＜M symbol, during 0＜M, do not send out frequency pilot sign in the UpPTS; When N＞=L＞=M symbol, send a frequency pilot sign in the UpPTS; And when L＞N symbol, send two frequency pilot signs in the UpPTS, and wherein, be long CP for symbol, 0＜M then, 0＜N＜=11; Be short CP for symbol, 0＜M then, 0＜N＜=13.
Preferably, when N＞=L＞=M symbol, send a frequency pilot sign in the UpPTS and specifically comprise: a frequency pilot sign is located at the of UpPTS
Or
Or
Individual character position.
Preferably, when N＞=L＞=M symbol, send a frequency pilot sign in the UpPTS and specifically comprise: if UpPTS the
Or
Or
Individual character position is occupied by RACH, then a frequency pilot sign is located at front or first character position of back of the shared character position of RACH, perhaps also is provided in a side of of UpPTS
Or
Or
Individual character position.
Preferably, when L＞N symbol, send two frequency pilot signs in the UpPTS and specifically comprise: positive number the 3rd and the 3rd character position reciprocal of two frequency pilot signs being located at respectively UpPTS.
Preferably, when L＞N symbol, sending two frequency pilot signs in the UpPTS specifically comprises: if the positive number of UpPTS the 3rd and/or the 3rd character position reciprocal are occupied by RACH, then two frequency pilot signs are located at the front of the shared character position of RACH or first character position of back and or positive number the 3rd and the 3rd character position reciprocal in the character position that is not occupied, perhaps or two frequency pilot signs are located at respectively positive number the 3rd and the 3rd character position reciprocal of UpPTS.
Preferably, M gets 4, N and gets 9.
Above-mentioned pilot symbols transmission method for wireless communication system has reasonably been determined quantity and the position of frequency pilot sign in the UpPTS.
According to a further aspect in the invention, provide a kind of frequency pilot sign dispensing device for wireless communication system, having comprised: the first module, if being used for the length of UpPTS is L symbol, symbol comprises long CP or short CP, when L＜M symbol, during 0＜M, do not send out frequency pilot sign in the UpPTS; The second module is used for when N＞=L＞=M symbol, sends a frequency pilot sign in the UpPTS; And the 3rd module, being used for when L＞N symbol, two frequency pilot signs of the interior transmission of UpPTS wherein, are long CP for symbol, 0＜M then, 0＜N＜=11; Be short CP for symbol, 0＜M then, 0＜N＜=13.
Preferably, the second module comprises: position units is used for a frequency pilot sign is located at the of UpPTS
Or
Or
Individual character position, if or UpPTS
Or
Or
Individual character position is occupied by RACH, then a frequency pilot sign is located at front or first character position of back of the shared character position of RACH, perhaps also is provided in a side of of UpPTS
Or
Or
Individual character position.
Preferably, the 3rd module comprises: position units, be used for two frequency pilot signs are located at respectively positive number the 3rd and the 3rd character position reciprocal of UpPTS, if or the positive number the 3rd of UpPTS and/or the 3rd character position reciprocal are occupied by RACH, then two frequency pilot signs are located at the front of the shared character position of RACH or first character position of back and or positive number the 3rd and the 3rd character position reciprocal in the character position that is not occupied, perhaps or two frequency pilot signs are located at respectively positive number the 3rd and the 3rd character position reciprocal of UpPTS.
Preferably, M gets 4, N and gets 9.
Above-mentioned frequency pilot sign dispensing device for wireless communication system has reasonably been determined quantity and the position of frequency pilot sign in the UpPTS.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 shows LTE and shows the TDD system frame structure;
Fig. 2 shows the pilot frequency locations of embodiment one;
Fig. 3 shows the pilot frequency locations of embodiment two;
Fig. 4 shows the pilot frequency locations of embodiment three;
Fig. 5 shows the pilot frequency locations of embodiment four;
Fig. 6 shows the pilot frequency locations of embodiment five;
Fig. 7 shows the pilot frequency locations of embodiment six;
Fig. 8 shows the pilot frequency locations of embodiment seven;
Fig. 9 shows the pilot frequency locations of embodiment eight;
Figure 10 shows the pilot frequency locations of embodiment nine;
Figure 11 shows the pilot frequency locations of embodiment ten;
Figure 12 shows the pilot frequency locations of embodiment 11.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
The embodiment of the invention has proposed the pilot symbols transmission method of the interior pilot frequency symbol position of a kind of definite UpPTS and quantity.Comprise the steps:
The length of 1, establishing UpPTS is L symbol (long CP or short CP), when L＜M symbol, does not send out pilot tone in the UpPTS;
The length of 2, establishing UpPTS is L symbol (long CP or short CP), when N＞=L＞=M symbol (for long CP, 0＜M, N＜=11; For short CP, 0＜M, N＜=13) time, sending a frequency pilot sign in the UpPTS, the position is in the centre of UpPTS.In addition, consider that the symbol that is positioned at UpPTS middle (or in the middle of approximate) may be used to send RACH, so pilot frequency locations can be
● still make pilot tone symbol of (or in the middle of approximate) in the middle of UpPTS send; Or
● perhaps pilot tone is offset a symbol backward or forward, to avoid the shared symbol of RACH.
According to top analysis, when sending a frequency pilot sign in the UpPTS, its position can be the
,
,
,
,
Or
Individual symbol (i.e. approximate middle position);
The length of 3, establishing UpPTS is L symbol (long CP or short CP), when L＞N symbol (for long CP, 0＜N＜=11; For short CP, 0＜N＜=13) time, sending two frequency pilot signs in the UpPTS, the position is on positive number the 3rd and the 3rd symbol reciprocal.Consider when positive number the 3rd and the 3rd symbol reciprocal may be used to send RACH, so pilot frequency locations can be:
● still send at positive number the 3rd, the 3rd symbol reciprocal; Or
● forward or backward first position of the character position that RACH is shared for example is offset a symbol with pilot tone, backward or forward to avoid the shared symbol of RACH.
According to top analysis, when sending two frequency pilot signs in the UpPTS, its position can be positive number the 3rd, the reciprocal the 3rd; Positive number the 3rd, the reciprocal the 4th; Positive number the 4th, the 3rd symbol reciprocal
Recommend M to get 4, N and get 9.
Above-mentioned pilot symbols transmission method for wireless communication system has reasonably been determined quantity and the position of frequency pilot sign in the UpPTS.Pilot frequency locations and quantity according to this method is determined can reduce expense to greatest extent when reaching better receptivity, improve the operating efficiency of LTE TDD system.
The embodiment of the invention also provides a kind of frequency pilot sign dispensing device for wireless communication system, comprising: the first module is L symbol if be used for the length of UpPTS, symbol comprises long CP or short CP, when L＜M symbol, during 0＜M, do not send out frequency pilot sign in the UpPTS; The second module is used for when N＞=L＞=M symbol, sends a frequency pilot sign in the UpPTS; And the 3rd module, being used for when L＞N symbol, two frequency pilot signs of the interior transmission of UpPTS wherein, are long CP for symbol, 0＜M then, 0＜N＜=11; Be short CP for symbol, 0＜M then, 0＜N＜=13.
Preferably, the second module comprises: position units is used for a frequency pilot sign is located at the of UpPTS
Or
Or
Individual character position, if or UpPTS
Or
Or
Individual character position is occupied by RACH, then a frequency pilot sign is located at front or first character position of back of the shared character position of RACH, perhaps also is provided in a side of of UpPTS
Or
Or
Individual character position.
Preferably, the 3rd module comprises: position units, be used for two frequency pilot signs are located at respectively positive number the 3rd and the 3rd character position reciprocal of UpPTS, if or the positive number the 3rd of UpPTS and/or the 3rd character position reciprocal are occupied by RACH, then two frequency pilot signs are located at the front of the shared character position of RACH or first character position of back and or positive number the 3rd and the 3rd character position reciprocal in the character position that is not occupied, perhaps or two frequency pilot signs are located at respectively positive number the 3rd and the 3rd character position reciprocal of UpPTS
Preferably, M gets 4, N and gets 9.
Above-mentioned frequency pilot sign dispensing device for wireless communication system has reasonably been determined quantity and the position of frequency pilot sign in the UpPTS.Pilot frequency locations and quantity according to this device is determined can reduce expense to greatest extent when reaching better receptivity, improve the operating efficiency of LTE TDD system.
In order to illustrate that better above-mentioned pilot symbols transmission method and dispensing device, the below provide several specific embodiments (supposition M=4, N=9, the symbol of short CP).
Embodiment one (as shown in Figure 2)
Suppose L=3, then do not send out pilot tone in the UpPTS.
Embodiment two (as shown in Figure 3)
Suppose L=4, then send a pilot tone in the UpPTS, the position is
Or
Embodiment three (as shown in Figure 4)
Suppose L=4, then send a pilot tone in the UpPTS, the position is
Or
Embodiment four (as shown in Figure 5)
Suppose L=6, then send a pilot tone, position in the UpPTS
Or
Embodiment five (as shown in Figure 6)
Suppose L=6, then send a pilot tone in the UpPTS, the position is
Or
Embodiment six (as shown in Figure 7)
Suppose L=5, then send a pilot tone in the UpPTS, the position is
Embodiment seven (as shown in Figure 8)
Suppose L=5, then send a pilot tone in the UpPTS, the position is
Embodiment eight (as shown in Figure 9)
Suppose L=5, then send a pilot tone in the UpPTS, the position is
Embodiment nine (as shown in figure 10)
Suppose L=12, then send two pilot tones in the UpPTS, the position is the 3rd symbol of positive number, and the 4th symbol reciprocal (supposition RACH is placed on the UpPTS back, RACH not with pilot tone at same symbol).
Embodiment ten (as shown in figure 11)
Suppose L=12, then send two pilot tones in the UpPTS, the position is the 4th symbol of positive number, and the 3rd symbol reciprocal (supposition RACH is placed on the UpPTS front, RACH not with pilot tone at same symbol).
Embodiment 11 (as shown in figure 12)
Suppose L=12, then send two pilot tones in the UpPTS, the position is the 3rd symbol of positive number, and the 3rd symbol reciprocal (supposition RACH is placed on the UpPTS back, RACH can with pilot tone at same symbol).
As can be seen from the above description, the present invention has realized following technique effect:
Above-mentioned pilot symbols transmission method and device for wireless communication system reasonably determined quantity and the position of frequency pilot sign in the UpPTS.According to this method and definite pilot frequency locations and the quantity of device, can when reaching better receptivity, reduce to greatest extent expense, improve the operating efficiency of LTE TDD system.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a pilot symbols transmission method that is used for wireless communication system is characterized in that, if the length of uplink pilot time slot UpPTS is L symbol, symbol comprises long loop prefix CP or short CP, may further comprise the steps:
When L＜M symbol, during 0＜M, do not send out frequency pilot sign in the UpPTS;
When N＞=L＞=M symbol, send a frequency pilot sign in the UpPTS; And
When L＞N symbol, send two frequency pilot signs in the UpPTS, and described two frequency pilot signs are located at respectively positive number the 3rd and the 3rd character position reciprocal of UpPTS,
Wherein, be long CP for described symbol, 0＜M then, 0＜N＜=11; Be short CP for described symbol, 0＜M then, 0＜N＜=13;
Wherein, described wireless communication system is Long Term Evolution LTE system TDD pattern.
2. pilot symbols transmission method according to claim 1 is characterized in that, when N＞=L＞=M symbol, sends a frequency pilot sign in the UpPTS and specifically comprises:
A described frequency pilot sign is located at the centre position of UpPTS, namely
Or
Or
Individual character position.
3. pilot symbols transmission method according to claim 1 is characterized in that, when N＞=L＞=M symbol, sends a frequency pilot sign in the UpPTS and specifically comprises:
If of UpPTS
Or
Or
Individual character position is occupied by RACH, then a described frequency pilot sign is located at front or first character position of back of the shared character position of RACH, perhaps also is provided in a side of of UpPTS
Or
Or
Individual character position.
4. pilot symbols transmission method according to claim 1 is characterized in that, when L＞N symbol, sends two frequency pilot signs in the UpPTS and specifically comprises:
If the positive number of UpPTS the 3rd and/or the 3rd character position reciprocal are occupied by Random Access Channel RACH, then described two frequency pilot signs are located at the front of the shared character position of RACH or first character position of back and or described positive number the 3rd and the 3rd character position reciprocal in the character position that is not occupied, perhaps or will described two frequency pilot signs be located at respectively positive number the 3rd and the 3rd character position of inverse of UpPTS.
5. according to claim 1 to 4 each described pilot symbols transmission methods, it is characterized in that, M gets 4, N and gets 9.
6. a frequency pilot sign dispensing device that is used for wireless communication system is characterized in that, comprising:
The first module is L symbol if be used for the length of uplink pilot time slot UpPTS, and symbol comprises long loop prefix CP or short CP, when L＜M symbol, during 0＜M, does not send out frequency pilot sign in the UpPTS;
The second module is used for when N＞=L＞=M symbol, sends a frequency pilot sign in the UpPTS; And
The 3rd module is used for when L＞N symbol, sends two frequency pilot signs in the UpPTS, and described two frequency pilot signs is located at respectively positive number the 3rd and the 3rd character position reciprocal of UpPTS,
Wherein, be long CP for described symbol, 0＜M then, 0＜N＜=11; Be short CP for described symbol, 0＜M then, 0＜N＜=13;
Wherein, described wireless communication system is Long Term Evolution LTE system TDD pattern.
7. frequency pilot sign dispensing device according to claim 6 is characterized in that, described the second module comprises:
Position units is used for a described frequency pilot sign is located at the centre position of UpPTS, and namely the
Or
Or
Individual character position, if or UpPTS
Or
Or
Individual character position is occupied by Random Access Channel RACH, then a described frequency pilot sign is located at front or first character position of back of the shared character position of RACH, perhaps also is provided in a side of of UpPTS
Or
Or
Individual character position.
8. frequency pilot sign dispensing device according to claim 6 is characterized in that, described the 3rd module comprises:
Position units, be used for when the positive number the 3rd of UpPTS and/or the 3rd character position reciprocal have been occupied by RACH, with described two frequency pilot signs be located at the front of the shared character position of RACH or first character position of back and or described positive number the 3rd and the 3rd character position reciprocal in the character position that is not occupied, perhaps or will described two frequency pilot signs be located at respectively positive number the 3rd and the 3rd character position of inverse of UpPTS.
9. according to claim 6 to 8 each described frequency pilot sign dispensing devices, it is characterized in that, M gets 4, N and gets 9.
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| CN2007101610828A CN101197588B (en) | 2007-12-26 | 2007-12-26 | Pilot symbols transmission method and device for radio communication system |
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| CN2007101610828A CN101197588B (en) | 2007-12-26 | 2007-12-26 | Pilot symbols transmission method and device for radio communication system |
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| CN101197588B true CN101197588B (en) | 2013-01-16 |
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| WO2017132993A1 (en) * | 2016-02-05 | 2017-08-10 | 华为技术有限公司 | Control information transmission method and apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2375692A (en) * | 2001-05-18 | 2002-11-20 | Roke Manor Research | Synchronising base stations in an UMTS terrestrial radio access telecommunications system |
| CN1878031A (en) * | 2005-06-09 | 2006-12-13 | 大唐移动通信设备有限公司 | Communication method for time-division duplex mobile communication system |
| CN101005308A (en) * | 2006-01-17 | 2007-07-25 | 上海原动力通信科技有限公司 | Physical layer random access method for broad band time division duplex mobile communication system |
-
2007
- 2007-12-26 CN CN2007101610828A patent/CN101197588B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2375692A (en) * | 2001-05-18 | 2002-11-20 | Roke Manor Research | Synchronising base stations in an UMTS terrestrial radio access telecommunications system |
| CN1878031A (en) * | 2005-06-09 | 2006-12-13 | 大唐移动通信设备有限公司 | Communication method for time-division duplex mobile communication system |
| CN101005308A (en) * | 2006-01-17 | 2007-07-25 | 上海原动力通信科技有限公司 | Physical layer random access method for broad band time division duplex mobile communication system |
Non-Patent Citations (1)
| Title |
|---|
| CATT等.Special Subframe Design for Optimized TDD Type 2.《TSG-RAN WG1 #51 R1-074822》.2007, * |
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