CN101431366B - Data transmission method of TDD system - Google Patents
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Abstract
The invention relates to the field of mobile communication technology, and discloses a method for transmitting data of a time division duplex system. The method comprises the following steps: a time slot length of a special area in a frame structure is expanded; and data is transmitted in an orthogonal frequency division multiplexing symbol of a down link pilot time slot of the special area. With the adoption of the method, channel resources in a wireless frame down link pilot frequency time slot can be effectively utilized so that other data can be transmitted at the same time when data of a main synchronizing channel is transmitted, ,therefore, data transmission efficiency can be improved.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of data transmission method of TDD system.
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 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 larger flexibility at 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 superior 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 the 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 Equations of The Second Kind frame structure of TD-SCDMA system compatible, specifically sees also shown in Figure 1.The frame length of Equations of The Second Kind 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 interval (GP) and ascending pilot frequency (UpPTS).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.
In described Equations of The Second Kind frame structure, the configuration that has defined two kinds of chip lengths (CP) is used for supporting different application scenarioss: at unicast service or in the situation that covering is used among a small circle, use length to be about the short CP of 8.33us, each subframe is made of 9 OFDMs (OFDM) symbol; At many cell broadcaste services or in the situation that covering is used on a large scale, use length to be about the long CP of 17.71us, each subframe is made of 8 OFDM symbols.
But, in described Equations of The Second Kind frame structure, main broadcast channel (P-BCH), primary synchronization channel (P-SCH), auxiliary synchronization channel (S-SCH) and the distribution of Physical Random Access Channel (PRACH) in subframe are as shown in Figure 2, the DwPTS part is except taking an OFDM (OFDM) symbols carry primary synchronization channel (P-SCH), other resource is vacant, does not carry other data resource.This wastes larger channel resource when the transmission of data for the TD-SCDMA system, cause the transmission of data inefficiency.
Summary of the invention
The embodiment of the invention provides a kind of data transmission method of TDD system, and descending pilot frequency time slot is merely able to transmit the primary synchronization channel data in tdd systems the transmission of data process to solve, and the channel resource waste is larger, 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 system, comprising:
The slot length of special area in the extension frame structure;
The transmission of data in the OFDM symbol of the descending pilot frequency time slot of described special area.
Preferably, the data of transmission are specially in the described OFDM symbol:
Primary synchronization channel data, down control channel data, business datum and associated pilot.
Preferably, the slot length of special area is specially in the extension frame structure:
The descending pilot frequency time slot of described special area is expanded forward, takies original subframe 0 last OFDM symbol.
Preferably, in first OFDM symbol transmission primary synchronization channel data of described descending pilot frequency time slot, second OFDM symbol begins to transmit down control channel data and pilot data thereof.
Preferably, first OFDM symbol at described descending pilot frequency time slot begins to transmit down control channel data and pilot data thereof, second OFDM symbol transmission primary synchronization channel data.
Preferably, in first OFDM symbol transmission primary synchronization channel data of described descending pilot frequency time slot, down control channel data and pilot data thereof also begin transmission at described first OFDM symbol.
Preferably, the slot length of special area is specially in the extension frame structure:
Special area is expanded forward, takies a conventional time slot of original subframe 0.
Preferably, in first OFDM symbol transmission primary synchronization channel data of described descending pilot frequency time slot, second OFDM symbol begins to transmit down control channel data and pilot data thereof.
Preferably, first OFDM symbol at described descending pilot frequency time slot begins to transmit down control channel data and pilot data thereof, second OFDM symbol transmission primary synchronization channel data.
Preferably, in first OFDM symbol transmission primary synchronization channel data of described descending pilot frequency time slot, down control channel data and pilot data thereof also begin transmission at described first OFDM symbol.
Preferably, main broadcast channel data is transmitted in described descending pilot frequency time slot, first OFDM symbol at described descending pilot frequency time slot begins to transmit down control channel data and pilot data thereof, the 7th OFDM symbol transmission primary synchronization channel data, main broadcast channel data is transmitted in described descending pilot frequency time slot.
Preferably, main broadcast channel data is transmitted in described descending pilot frequency time slot, first OFDM symbol at described descending pilot frequency time slot begins to transmit down control channel data and pilot data thereof, the 8th OFDM symbol transmission primary synchronization channel data.
Compared with prior art, the embodiment of the invention has changed LET tdd frame structure, has expanded simultaneously the DwPTS slot length, can be except carrying the P-SCH data transmit, simultaneously can also carry other resource data and transmit, effectively utilize channel resource, improve data transmission efficiency.
Description of drawings
Fig. 1 is existing LTE system Equations of The Second Kind frame structure schematic diagram;
Fig. 2 is existing LTE system Equations of The Second Kind frame structure data transmission resources distribution schematic diagram;
Fig. 3 is the method flow diagram of the embodiment of the invention;
Fig. 4 is embodiment of the invention LTE tdd frame structural representation;
Fig. 5 is embodiment of the invention LTE tdd frame structure special area structural representation;
Fig. 6 is embodiment of the invention uplink and downlink timeslot ratio structural representation;
Fig. 7 is the data transmission resources structural representation of first preferred embodiment of the invention the first implementation;
Fig. 8 is the data transmission resources structural representation of first preferred embodiment of the invention the second implementation;
Fig. 9 is the data transmission resources structural representation of the third implementation of first preferred embodiment of the invention;
Figure 10 is second preferred embodiment of the invention uplink and downlink timeslot ratio structural representation.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.See also and Figure 3 shows that method flow diagram provided by the present invention, comprise step:
Step S301: the slot length of special area in the extension frame structure;
Step S302: the transmission of data in the OFDM symbol of the descending pilot frequency time slot of described special area.
Technical scheme of the present invention specifically sees also shown in Figure 4 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 altogether conventional time slot and 1 special area that duration is 1ms that 8 durations are 0.5ms.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 5, wherein, DwPTS, the duration of UpPTS and GP is ordered flexible configuration by high level, can change arranging according to different needs, with in 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 namely 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).In 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 6, the uplink and downlink timeslot ratio schematic diagram in the situation of the first behavior prior art LET TDD Equations of The Second Kind frame structure wherein.Wherein be the ratio of descending time slot and ascending time slot at 6: 1, and in this ratio situation, all for the transmission of downlink data, TS1 is used for the transmission of upstream data for TS0, TS2-TS6.And in the LTE tdd frame structure that provides according to technical solution of the present invention, the transmission time slot of described downlink data has 4 subframes, and does not have the transmission time slot of upstream data, namely shown in last column among Fig. 5.In this case, the number of OS is 1 among the described DwPTS, just is used for transmission P-SCH, can not transmit other data.
For DwPTS, owing to there is P-SCH, if system bandwidth only is 1.25MHz, and only exist in the situation of an OS, DwPTS just can't transmit descending control signaling.Even in the larger situation of bandwidth, 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 6, at this moment, can not guarantee that namely 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, namely can not realize transmitting among the DwPTS descending control signaling data.
Technical scheme provided by the present invention makes described DwPTS can transmit simultaneously P-SCH, descending control signaling and frequency pilot sign by expansion DwPTS resource, and its concrete implementation procedure sees also following preferred embodiment.
According to above-mentioned analysis, if when described DwPTS only has an OFDM symbol, P-SCH will produce with down control channel resources and conflict.In the first preferred embodiment provided by the present invention, described DwPTS borrows an OFMD symbol of original subframe 0, guaranteed that described DwPTS comprises 2 OFDM symbols at least, can solve DwPTS carrying P-SCH resource and downlink control channel (DL-CCH, downlink control channel) the afoul problem of resource.
After described DwPTS borrows an OFDM symbol from original subframe (sub-frame) 0, then amended DwPTS is equivalent to have more an OFDM symbol, be equivalent to main broadcast channel (P-BCH), auxiliary synchronization channel (S-SCH) and the position of primary synchronization channel (P-SCH) in DwPTS are moved an OFDM symbol backward, namely in the symbol of using shown in Figure 7, be used for realizing P-SCH, and S-SCH last symbol in new subframe 0 is realized, P-SCH realized before S-SCH that still the realization front with modification sequentially is consistent.In the situation of this preferred embodiment, can be implemented in by different modes transmission P-SCH and DL-CCH and associated pilot thereof among the DwPTS.
Mode one: see also shown in Figure 7ly, P-SCH is the OFDM of first among DwPTS symbol transmission after expansion, and DL-CCH transmits from second OFDM sign-on, and its pilot data is equally also from described second OFDM sign-on transmission;
Mode two: see also shown in Figure 8, first the OFDM sign-on transmission of DL-CCH from expand rear DwPTS, equally also from described second OFDM sign-on transmission, P-SCH is second OFDM symbol transmission for its pilot data;
Mode three: see also shown in Figure 9, P-SCH first OFDM sign-on transmission from expand rear DwPTS, DL-CCH is equally also in described first OFDM sign-on transmission, fastens but close at resource mapping, and the shared frequency domain of described DL-CCH and P-SCH does not partly overlap.
Use the described three kinds of modes of the first preferred embodiment that the invention described above provides, DwPTS uses last OFDM symbol of former industry subframe 0, thereby guarantee himself to comprise at least 2 OFDM symbols, therefore described DwPTS not only can transmit the P-SCH data, can also transmit DL-CCH data and pilot data thereof, take full advantage of the DwPTS resource, thereby improve the tdd systems data transmission efficiency.
The second preferred embodiment provided by the invention specifically sees also shown in Figure 10, in this preferred embodiment, the special area of described new LTE tdd frame structure is expanded forward a conventional time slot, be 0.5ms, then the duration of the special area after the expansion becomes with 1.5ms, and the duration of subframe 0 becomes 0.5ms.Namely in Figure 10, time slot and Fig. 6 of being used for transmitting downlink data compare, and all reduce by a conventional time slot.Like this, under the prerequisite that guarantees the tdd systems compatibility, the resource of DwPTS is expanded, and when short CP, the length minimum of DwPTS is 8 OFDM symbols.
In this case, DwPTS can be easy to realize realizing as the transmission means of generic downlink transfer of data time slot the transmission of downlink data.Its concrete implementation is specific as follows:
Mode one: P-SCH is the OFDM of first among DwPTS symbol transmission after expansion, and DL-CCH transmits from second OFDM sign-on, and its pilot data is equally also from described second OFDM sign-on transmission;
Mode two: DL-CCH first OFDM sign-on transmission from expand rear DwPTS, equally also from described second OFDM sign-on transmission, P-SCH is second OFDM symbol transmission for its pilot data;
First the OFDM sign-on transmission of mode three: P-SCH from expand rear DwPTS, DL-CCH is equally also in described first OFDM sign-on transmission, fastens but close at resource mapping, and the shared frequency domain of described DL-CCH and P-SCH does not partly overlap;
Mode four: DL-CCH first OFDM sign-on transmission from expand rear DwPTS, its pilot data is equally also from described first OFDM sign-on transmission, in the situation of short CP, the 8th the OFDM symbol transmission of P-SCH DwPTS after expansion, in the situation of long CP, the 7th the OFDM symbol transmission of P-SCH DwPTS after expansion.Simultaneously, the data of main broadcast channel (PBCH) are also transmitted in described descending pilot frequency time slot.
Use the described four kinds of modes of the second preferred embodiment that the invention described above provides, the special area of described new LTETDD frame structure is expanded forward a conventional time slot, make the duration of himself become 1.5ms, therefore described DwPTS not only can transmit the P-SCH data, can also transmit DL-CCH data and pilot data thereof, take full advantage of the DwPTS resource, thereby improve the tdd systems data transmission efficiency.
The above only is 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 (12)
1. a data transmission method of TDD system is characterized in that, described method comprises:
The slot length of special area in the extension frame structure, described special area is made of descending pilot frequency DwPTS, ascending pilot frequency UpPTS and three time slots of protection interval GP;
The transmission of data in the OFDM symbol of the descending pilot frequency time slot of described special area.
2. method according to claim 1 is characterized in that, the data of transmission are specially in the described OFDM symbol:
Primary synchronization channel data, down control channel data, business datum and associated pilot.
3. method according to claim 1 is characterized in that, the slot length of special area is specially in the extension frame structure:
The descending pilot frequency time slot of described special area is expanded forward, takies original subframe 0 last OFDM symbol.
4. method according to claim 3 is characterized in that, in first OFDM symbol transmission primary synchronization channel data of described descending pilot frequency time slot, second OFDM symbol begins to transmit down control channel data and pilot data thereof.
5. method according to claim 3 is characterized in that, begins to transmit down control channel data and pilot data thereof at first OFDM symbol of described descending pilot frequency time slot, second OFDM symbol transmission primary synchronization channel data.
6. method according to claim 3, it is characterized in that, in first OFDM symbol transmission primary synchronization channel data of described descending pilot frequency time slot, down control channel data and pilot data thereof also begin transmission at described first OFDM symbol.
7. method according to claim 1 is characterized in that, the slot length of special area is specially in the extension frame structure:
Special area is expanded forward, takies a conventional time slot of original subframe 0.
8. method according to claim 7 is characterized in that, in first OFDM symbol transmission primary synchronization channel data of described descending pilot frequency time slot, second OFDM symbol begins to transmit down control channel data and pilot data thereof.
9. method according to claim 7 is characterized in that, begins to transmit down control channel data and pilot data thereof at first OFDM symbol of described descending pilot frequency time slot, second OFDM symbol transmission primary synchronization channel data.
10. method according to claim 7, it is characterized in that, in first OFDM symbol transmission primary synchronization channel data of described descending pilot frequency time slot, down control channel data and pilot data thereof also begin transmission at described first OFDM symbol.
11. method according to claim 7, it is characterized in that, main broadcast channel data is transmitted in described descending pilot frequency time slot, first OFDM symbol at described descending pilot frequency time slot begins to transmit down control channel data and pilot data thereof, the 7th OFDM symbol transmission primary synchronization channel data.
12. method according to claim 7, it is characterized in that, main broadcast channel data is transmitted in described descending pilot frequency time slot, first OFDM symbol at described descending pilot frequency time slot begins to transmit down control channel data and pilot data thereof, the 8th OFDM symbol transmission primary synchronization channel data.
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| CN105577320B (en) * | 2014-10-17 | 2018-10-30 | 电信科学技术研究院 | A kind of data transmission method and device |
| CN109716697B (en) * | 2017-03-10 | 2021-04-20 | 华为技术有限公司 | Transmission method, device and system for uplink control signaling |
| CN110809319B (en) * | 2018-08-06 | 2023-10-31 | 黎光洁 | Data transmission method and data transmission system in Internet of things |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110914C (en) * | 1996-12-27 | 2003-06-04 | Lg电子株式会社 | Adaptive Random Access Protocol and Dynamic Retrieval Tree Expansion Decomposition for Multisite Networks |
| CN1832378A (en) * | 2005-03-11 | 2006-09-13 | 大唐移动通信设备有限公司 | Method for radio transmission using high-efficient high performance frame structure for wide-band TDD system |
| CN1878144A (en) * | 2006-07-14 | 2006-12-13 | 华为技术有限公司 | Multi-queue flow control method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110914C (en) * | 1996-12-27 | 2003-06-04 | Lg电子株式会社 | Adaptive Random Access Protocol and Dynamic Retrieval Tree Expansion Decomposition for Multisite Networks |
| CN1832378A (en) * | 2005-03-11 | 2006-09-13 | 大唐移动通信设备有限公司 | Method for radio transmission using high-efficient high performance frame structure for wide-band TDD system |
| CN1878144A (en) * | 2006-07-14 | 2006-12-13 | 华为技术有限公司 | Multi-queue flow control method |
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