CN101426283B - Data transmission method for time division duplexing system - Google Patents
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- CN101426283B CN101426283B CN2007101767951A CN200710176795A CN101426283B CN 101426283 B CN101426283 B CN 101426283B CN 2007101767951 A CN2007101767951 A CN 2007101767951A CN 200710176795 A CN200710176795 A CN 200710176795A CN 101426283 B CN101426283 B CN 101426283B
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Abstract
The present invention relates to mobile communication field and discloses a data transmission method of time division duplex system, wherein the method comprises the following procedures: confirming the orthogonal frequency division multiplexing symbol in the descending pilot frequency time slot; and transmitting data in the confirmed orthogonal frequency division multiplexing symbol. The method provided by the invention can effectively use the channel resource in the downlink pilot time slot of wireless frame and transmits other data when the data of primary synchronous channel is transmitted for increasing the data transmission efficiency.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of transmission method of tdd systems data.
Background technology
Follow the mobile communication technology develop rapidly, 3G (Third Generation) Moblie (3G) technology is day by day ripe.3G technology is used code division multiple access (CDMA) mode, modulates much larger than the high speed pseudo noise code of signal bandwidth with a bandwidth, and the bandwidth of former data-signal is expanded, again through carrier modulation and send.Receiving terminal uses identical pseudo noise code, makes relevant treatment with the bandwidth signal that receives, and the narrow band signal that broadband signal is changed into the prime information data is a despreading process, to realize information communication.Wherein, TD-SCDMA technology is the CDMA standard that only employing time division duplex (TDD) is realized in three kinds of international CDMA standard techniques, and it supports the transmission of up-downgoing non-symmetrical service, has bigger flexibility on spectrum utilization.TD-SCDMA adopts the advanced technology in the radio communications such as smart antenna, uplink synchronous, joint-detection and software radio, makes the TD-SCDMA system have the availability of frequency spectrum of higher performance.
Third generation partner program (3GPP) is in order to keep the permanent competitiveness of CDMA technology, started 3G wireless interface technology Long Term Evolution (Long Term Evolution, LTE) research project comprises and reduces time delay, improves user data rate, improves content such as power system capacity.In the Long Term Evolution scheme (LET TDD) of TD-SCDMA, its first-selected frame structure is and the LTE system second class frame structure of TD-SCDMA system compatible, specifically sees also shown in Figure 1.The frame length of the second class radio frames is 10ms; each radio frames is divided into the field of two 5ms durations; each field is by the i.e. # 0---#6 among the figure of 7 business time-slots; and 3 special time slots form, and described 3 special time slots are descending pilot frequency (DwPTS), protection (GP) and ascending pilot frequency (UpPTS) at interval.Business time-slot of each subframe definition.Wherein, subframe 0 and descending pilot frequency time slot always are used for downlink transfer, and uplink pilot time slot and subframe 1 always are used for uplink.
But in the described second class frame structure, the position and the structure of special time slot are all fixed, and the DwPTS part is except carrying primary synchronization channel (P-SCH), and other resource is vacant, does not carry other data resource.This wastes bigger channel resource when the transmission data for the TD-SCDMA system, cause efficiency of transmission low.
Summary of the invention
The embodiment of the invention provides a kind of data transmission method of tdd systems, and is bigger with channel resource waste in the solution TD-SCDMA system Long Term Evolution scheme, the problem that data transmission efficiency is low.
For addressing the above problem, the embodiment of the invention provides a kind of data transmission method of tdd systems, comprises step:
Determine the OFDM symbol of descending pilot frequency time slot;
In described definite OFDM symbol, transmit data;
Wherein, the data of transmission are specially in the described OFDM symbol:
Primary synchronization channel data, down control channel data, business datum and associated pilot;
Down control channel interweaves and is mapped in first to the 3rd time period with interior OFDM symbol of described descending pilot frequency time slot, perhaps, down control channel interweaves that second OFDM symbol that is mapped to described descending pilot frequency time slot rises, in the 4th OFDM symbol of as many as, and described descending pilot frequency time slot moved an OFDM symbol behind the frequency pilot sign on first, second OFDM symbol.
Preferably, described descending pilot frequency time slot comprises two OFDM symbols at least.
Preferably, first OFDM symbol at described descending pilot frequency time slot transmits the primary synchronization channel data in the time period.
Preferably, if described primary synchronization channel data and described down control channel data are transmitted in same OFDM symbol, then described down control channel only is mapped in the unappropriated OFDM symbol of described primary synchronization channel data.
Preferably, the quantity of the described OFDM symbol of distributing to descending control signaling as required dynamic-configuration be one, two or three.
A kind of data transmission method of tdd systems comprises step:
Determine the OFDM symbol of descending pilot frequency time slot;
In described definite OFDM symbol, transmit data;
Wherein, the data of transmission are specially in the described OFDM symbol:
Primary synchronization channel data, down control channel data, business datum and associated pilot;
Wherein, down control channel interweaves be mapped to described descending pilot frequency time slot first to the 3rd with in the interior OFDM symbol.
Preferably, described descending pilot frequency time slot comprises two OFDM symbols at least.
Preferably, second OFDM symbol at described descending pilot frequency time slot transmits the primary synchronization channel data in the time period.
Preferably, if described primary synchronization channel data and described down control channel data are transmitted in same OFDM symbol, then described down control channel only is mapped in the unappropriated OFDM symbol of described primary synchronization channel data.
Preferably, the quantity of the described OFDM symbol of distributing to descending control signaling as required dynamic-configuration be one, two or three.
Compared with prior art, the embodiment of the invention has changed LET tdd frame structure, in DwPTS, comprise simultaneously 2 OFDM symbol (OFDM Symbol at least, OS), make it can be except carrying P-SCH transmits, simultaneously can also carry other resource data and transmit, effectively utilize channel resource, improve data transmission efficiency.
Description of drawings
Fig. 1 is the existing LTE system second class frame structure schematic diagram;
Fig. 2 is an embodiment of the invention method flow diagram;
Fig. 3 is the LTE tdd frame structural representation of the embodiment of the invention;
Fig. 4 is an embodiment of the invention LTE tdd frame structure special area structural representation;
Fig. 5 is an embodiment of the invention uplink and downlink timeslot ratio structural representation;
Fig. 6 is a first preferred embodiment of the invention DwPTS structural representation;
Fig. 7 be the control order of embodiment of the invention general service time slot downlink business with the pilot frequency symbol position schematic diagram;
Fig. 8 is a second preferred embodiment of the invention DwPTS structural representation;
Fig. 9 is a third preferred embodiment of the invention DwPTS structural representation.
Embodiment
Below in conjunction with drawings and Examples the present invention is done detailed explanation.See also shown in Figure 2ly, specifically comprise step:
Step S201: the OFDM symbol of determining descending pilot frequency time slot;
Step S202: in described definite OFDM symbol, transmit data.
Technical scheme of the present invention specifically sees also shown in Figure 3 based on a kind of new LTE tdd frame structure.Wherein, the duration of each frame is 10ms, and is divided into the field of two 5ms.Each 5ms field distributes again, is divided into conventional time slot and 1 special area that duration is 1ms that 8 durations are 0.5ms altogether.Described two conventional time slots are composed of a subframe, and described special area is made of DwPTS, UpPTS, three time slots of GP.
The special area structural representation of described new LTE tdd frame structure sees also shown in Figure 4, wherein, DwPTS, the duration of UpPTS and GP is ordered flexible configuration by high level, can on being provided with, change according to different needs, with under the situation that guarantees different uplink and downlink timeslot ratios all can with the compatibility of TD-SCDMA system, and satisfy different signal and cover demand.But no matter how the duration of described DwPTS, UpPTS and three time slots of GP changes, their duration summation, and promptly the duration of described special area is changeless, is 1ms.
In described special area, P-SCH is at OFDM symbol of DwPTS Time Slot Occupancy (OS, OFDM symbol).Under the situation of different uplink and downlink timeslot ratios, DwPTS can have different OS numbers, and minimum is 1, mostly is 10 most, please specifically consult shown in Figure 5, the uplink and downlink timeslot ratio schematic diagram under the situation of the first behavior prior art LET TDD, the second class frame structure wherein.Wherein be the ratio of descending time slot and ascending time slot at 6: 1, and under this ratio situation, TS0, TS2-TS6 all are used for the transmission of downlink data, and TS1 is used for transmission of uplink data.And according in the LTE tdd frame structure that technical solution of the present invention provided, the transmission time slot of described downlink data has 4 subframes, and does not have the transmission of uplink data time slot, promptly shown in last column among Fig. 5.In this case, the number of OS is 1 among the described DwPTS, just is used to transmit P-SCH, can not transmit other data.
For DwPTS, owing to there is P-SCH,, and only exist under the situation of an OS if system bandwidth only is 1.25MHz, DwPTS just can't transmit descending control signaling.Even bandwidth is bigger, the existence of P-SCH can have influence on the position of scheduling channel equally.Simultaneously, because the existence of frequency pilot sign also can have influence on the demodulation of data.
Therefore, technical scheme provided by the present invention includes 2 OS at least by design in DwPTS, see also shown in Figure 5, at this moment, can not guarantee that promptly time slot ratio up and down is the compatibility of 3: 4 and at 6: 1 o'clock, because in both cases, include only 1 OS among the DwPTS, promptly can not realize transmitting among the DwPTS descending control signaling.
Technical scheme provided by the present invention can be transmitted P-SCH, descending control signaling and frequency pilot sign simultaneously, and its concrete implementation procedure sees also following preferred embodiment.
First preferred embodiment of the present invention in DwPTS, includes 6 OS please as shown in Figure 6, and wherein first OS comprises P-SCH, also comprises frequency pilot sign and descending control signaling simultaneously, and wherein RS represents frequency pilot sign, and C represents descending control signaling; Second OS comprises frequency pilot sign and descending control signaling; The 5th OS comprises frequency pilot sign and data, and the included content of other OS by that analogy.Use this DwPTS structure, do not need to change the position of P-SCH, still be in first symbol of DwPTS.Simultaneously, can transmit descending control signaling among other the OS in DwPTS, frequency pilot sign and data have realized effective utilization of DwPTS.
For common downlink business time slot, descending control signaling takies the individual OS of preceding m (m＜=3), sees also and Figure 7 shows that descending control signaling and pilot frequency locations schematic diagram, and wherein transverse axis is a time shaft, and the longitudinal axis is a frequency axis.In the drawings, R
0-R
3Correspond to the frequency pilot sign of first to the 4th antenna respectively, C represents the resource that descending control signaling is shared.
According to described descending control signaling shown in Figure 7 and pilot frequency locations, in conjunction with the DwPTS structural representation of first preferred embodiment of the invention shown in Figure 6 as can be seen, during the RS that in losing the 5th OS, comprised, pairing P-SCH will lose the frequency pilot sign of first antenna and second antenna, and this will cause the demodulation performance of signal acutely to descend.
The schematic diagram of second preferred embodiment provided by the invention as shown in Figure 8, described DwPTS comprises 6 OS equally, include P-SCH in first OS, and descending control signaling is positioned among second OS, is not in same P-SCH with P-SCH.In first OS, except that taking the part of P-SCH, other parts are used to transmit data.In addition, utilize the 4th to the 6th OS to carry out the transmission of data equally.
This preferred embodiment combines this preferred embodiment second OS that place of descending control signaling as can be seen with Fig. 7, can guarantee to exist the frequency pilot sign of first antenna and second antenna, promptly guarantees R
0With R
1There is frequency pilot sign in pairing OS, therefore when DwPTS transmits data, guarantees that data institute demodulation performance can not descend.
The schematic diagram of the 3rd preferred embodiment provided by the invention produces as shown in Figure 9, wherein, the 2nd OS in DwPTS comprises described P-SCH, and descending control signaling is arranged in an OS, therefore can not produce and conflict with described P-SCH, simultaneously can find out that in conjunction with shown in Figure 7 P-SCH is merely able to have influence on the frequency pilot sign of third antenna and the 4th antenna, promptly with R
3With R
4Corresponding RS therefore when DwPTS can transmit data, can realize data demodulation influence lessly, realizes the normal transmission and the demodulation of data.
According to technical scheme provided by the present invention, in the new LTE tdd frame structure that is provided, the DwPTS time slot of special area not only comprises P-SCH and down control channel, can utilize simultaneously residual resource transmission data, thereby realize effective utilization of channel resource, improve data transmission efficiency.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the data transmission method of a tdd systems is characterized in that, described method comprises:
Determine the OFDM symbol of descending pilot frequency time slot;
In described definite OFDM symbol, transmit data;
Wherein, the data of transmission are specially in the described OFDM symbol:
Primary synchronization channel data, down control channel data, business datum and associated pilot;
Wherein, down control channel interweaves and is mapped in first to the 3rd time period with interior OFDM symbol of described descending pilot frequency time slot, perhaps, down control channel interweaves that second OFDM symbol that is mapped to described descending pilot frequency time slot rises, in the 4th OFDM symbol of as many as, and described descending pilot frequency time slot moved an OFDM symbol behind the frequency pilot sign on first, second OFDM symbol.
2. method according to claim 1 is characterized in that, described descending pilot frequency time slot comprises two OFDM symbols at least.
3. method according to claim 1 is characterized in that, transmits the primary synchronization channel data in the time period at first OFDM symbol of described descending pilot frequency time slot.
4. method according to claim 1 and 2, it is characterized in that, if described primary synchronization channel data and described down control channel data are transmitted in same OFDM symbol, then described down control channel only is mapped in the unappropriated OFDM symbol of described primary synchronization channel data.
5. method according to claim 1 and 2 is characterized in that, distribute to descending control signaling OFDM symbol quantity as required dynamic-configuration be one, two or three.
6. the data transmission method of a tdd systems is characterized in that, described method comprises:
Determine the OFDM symbol of descending pilot frequency time slot;
In described definite OFDM symbol, transmit data;
Wherein, the data of transmission are specially in the described OFDM symbol:
Primary synchronization channel data, down control channel data, business datum and associated pilot;
Wherein, down control channel interweaves be mapped to described descending pilot frequency time slot first to the 3rd with in the interior OFDM symbol.
7. method according to claim 6 is characterized in that, described descending pilot frequency time slot comprises two OFDM symbols at least.
8. method according to claim 6 is characterized in that, transmits the primary synchronization channel data in the time period at second OFDM symbol of described descending pilot frequency time slot.
9. according to claim 6 or 7 described methods, it is characterized in that, if described primary synchronization channel data and described down control channel data are transmitted in same OFDM symbol, then described down control channel only is mapped in the unappropriated OFDM symbol of described primary synchronization channel data.
10. according to claim 6 or 7 described methods, it is characterized in that, distribute to descending control signaling OFDM symbol quantity as required dynamic-configuration be one, two or three.
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| CN102457966A (en) * | 2010-10-27 | 2012-05-16 | 中兴通讯股份有限公司 | Method and system for using Sounding channel |
| CN104734826B (en) * | 2013-12-20 | 2020-08-11 | 中兴通讯股份有限公司 | Ultra-large bandwidth data sending control method and ultra-large bandwidth data sending equipment |
| CN106559204B (en) | 2015-09-29 | 2020-05-26 | 电信科学技术研究院 | Pilot frequency configuration method and device |
| CN109429206B (en) * | 2018-05-30 | 2021-10-26 | 展讯通信（上海）有限公司 | Bluetooth data transmission method and device and user equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1450742A (en) * | 2002-04-09 | 2003-10-22 | 华为技术有限公司 | Time-division duplex mode based high-speed data transmission method |
| CN1913418A (en) * | 2005-08-08 | 2007-02-14 | 大唐移动通信设备有限公司 | Method for supporting changable cover by time division duplex system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450742A (en) * | 2002-04-09 | 2003-10-22 | 华为技术有限公司 | Time-division duplex mode based high-speed data transmission method |
| CN1913418A (en) * | 2005-08-08 | 2007-02-14 | 大唐移动通信设备有限公司 | Method for supporting changable cover by time division duplex system |
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