CN101141187B - Method of generating frame of OFDM technology under TDD mode - Google Patents
Method of generating frame of OFDM technology under TDD mode Download PDFInfo
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Abstract
The present invention discloses a method to create frames with orthogonal frequency division multiplexing (OFDM) under duplex mode, which comprises steps below: Writing downlink data into a first time slot TS0', writing uplink data into a second time slot TS1', writing the uplink data or downlink data into a third to seventh time slot TS2 to TS6 to form a first 5 ms sub-frame of 10 ms. Similarly, forming a second 5 ms sub-frame of 10 ms, thus creating a 10 ms wireless frame. Wherein, downlink auxiliary synchronous signals are written into a second OFDM symbol in reverse order towards the TS0'. Main downlink synchronous signal are written into a last OFDM symbol of the TS0'. In addition, uplink random access signals are written into any one or a plurality of consecutive uplink time slots. The present invention is capable of utilizing other frequency resources on DwPTS and UpPTS time slots, reducing mutual impact amongst base stations and increasing coverage scope.
Description
Technical field
The present invention relates to digital communicating field, particularly relate under a kind of time division duplex (TDD) pattern the generation method based on the frame of OFDM (OFDM) technology.
Background technology
3GPP has proposed the plan of Long Term Evolution (LTE) in order to make its wireless communication technique in 10 years or its competitiveness of longer maintenance in future.Its demand mainly contains high user data rate, and high spectrum utilization, is supported high mobility, wide coverage etc. at low the delay.But these demands all are consistent for the future communications system, because following data service is more and more rich and varied, this just needs system that higher transmission rate is provided, and the cry requirement system of global digital equality considers the demand of super covering far away, to eliminate the digital divide in the whole world.
A kind of approach of high speed data transfers is provided based on OFDM (OFDM) technology, be converted to the data flow of one group of low-speed parallel transmission by the data flow with a high-speed transfer, system is reduced greatly to the susceptibility of multidiameter fading channel frequency selectivity, and the introducing of Cyclic Prefix has further strengthened again the ability of disturbing between the anti-intersymbol interference of system (ISI) and subcarrier.The characteristics such as bandwidth availability ratio in addition is high, realization is simple make OFDM more and more wider in the application of wireless communication field, such as, WLAN (wireless local area network) (WLAN) system all is based on the system of OFDM technology based on micro-wave access global inter communication (WiMAX) system etc. of orthogonal frequency division multiplexing multiple access (OFDMA).
Simultaneously, because data service is abundant, the asymmetric internet type business of up-downgoing will progressively replace symmetrical voice service and become the main business type of future mobile communications.Will there be natural advantage in the system that is operated under the tdd mode aspect this asymmetric traffic of processing.By adjusting the transfer point of uplink and downlink timeslot, easily balanced up-downgoing is professional.
But the frame structure under the existing tdd mode can not be given full play to the characteristics of OFDM technology.For example, the calculated the second frame structure of the LTE of 3GPP as shown in Figure 1, frame length is 10ms, is divided into the field of two 5ms, each field comprises again 7 subframes and (also claims time slot, be respectively TS0～TS6).Wherein first time slot TS0 is fixed as descending time slot; auxiliary synchronous signals (S-SCH) is fixed on last OFDM symbol of TS0 and sends; second time slot TS1 is fixed as ascending time slot; three special time slot: DwPTS (downlink synchronization slot) are arranged between TS0 and TS1; GP (protection interval), UpPTS (uplink synchronous time slot).The upper fixing transmission master sync signal (P-SCH) of DwPTS, and UpPTS accesses signal as uplink random in little coverage.Because the DwPTS time slot is a special time slot, the fixing master sync signal that sends of the above only takies the middle 1.25MHz of system bandwidth.Usually, the DwPTS time slot is not put other data except middle 1.25MHz.Like this, when system bandwidth during greater than 1.25MH, other frequency resources on the DwPTS time slot will be wasted.Equally, usually, the UpPTS time slot is not put other data except carrying 1.25MHz RACH channel.Like this, when system bandwidth during greater than 1.25MH, other frequency resources on the UpPTS time slot will be wasted.If other frequency resources on DwPTS except master sync signal send other data, because the GP duration is too short, the data on the DwPTS will impact the access of the uplink synchronous on the UpPTS of back.Usually, for fear of the data of DwPTS time slot since delay to the up access signal of UpPTS, the signal of the upper transmission of UpPTS is usually in the frequency range transmission different from DwPTS.
In addition, under this frame structure, GP only has 50us, influencing each other between the base station is larger, as UpPTS during as the uplink random access slot, the downstream signal of other base stations can impact the reception of the uplink random access of this base station, thereby affects coverage.
In sum, a kind of other frequency resources that can more reasonably utilize on DwPTS and the UpPTS time slot of current needs reduce under the TDD mode of the problem that influences each other between the base station technical scheme based on the frame of orthogonal frequency division multiplexi.
Summary of the invention
Technical problem to be solved by this invention provides a kind of generation method of frame of OFDM technology under TDD mode, can more reasonably utilize other frequency resources on DwPTS and the UpPTS time slot, reduces influencing each other between the base station.
In order to address the above problem, the invention provides a kind of generation method of frame of OFDM technology under TDD mode, may further comprise the steps,
Downlink data is write among first time slot TS0 ', upstream data is write among second time slot TS1 ', the upstream or downstream data are write among the 3rd to the 7th the time slot TS2 to TS6, form front 5 milliseconds of fields of 10 milliseconds; Same, form rear 5 milliseconds of fields of 10 milliseconds, thereby generate one 10 milliseconds radio frames; Wherein, descending auxiliary synchronous signals is write in the penult OFDM symbol of TS0 ', descending master sync signal is write in last OFDM symbol of TS0 '; Uplink random is accessed signal to be write in any one or the continuous a plurality of ascending time slot.
Further, above-mentioned generation method can comprise that also for described TS0 ' and described TS1 ', the duration of regular circulation prefix is 8.333 microseconds, the duration of extended cyclic prefix is 16.667 microseconds, and the duration of a downlink or uplink signal is 66.667 microseconds;
For described TS2 to TS6, the duration of regular circulation prefix is 8.333 microseconds, and the duration of extended cyclic prefix is 17.708 microseconds, and the duration of a downlink or uplink signal is 66.667 microseconds.
Further, above-mentioned generation method also can comprise, when described TS0 ' uses the regular circulation prefix, described TS0 ' comprises 10 with OFDM symbol and the descending master sync signal among the TS0 ' and the descending auxiliary synchronous signals of regular circulation prefix, all use conventional Short Length Cyclic Prefix, the duration of described TS0 ' be 10 with the OFDM symbol duration of regular circulation prefix, i.e. 750 microseconds.
Further, above-mentioned generation method can comprise that also when described TS1 ' used the regular circulation prefix, the duration of described TS1 ' was 750 microseconds.
Further, above-mentioned generation method also can comprise, when described TS0 ' uses extended cyclic prefix, described TS0 ' comprises 9 with OFDM symbol and the descending master sync signal among the TS0 ' and the descending auxiliary synchronous signals of extended cyclic prefix, all use extended cyclic prefix, the duration of described TS0 ' be 9 with the OFDM symbol duration of extended cyclic prefix, i.e. 750 microseconds.
Further, above-mentioned generation method can comprise that also when described TS1 ' used extended cyclic prefix, the duration of described TS1 ' was 750 microseconds.
Further, above-mentioned generation method can comprise that also no matter which kind of Cyclic Prefix TS0 ' and TS1 ' use, the lasting time of TS0 ' and TS1 ' all equates, i.e. 750 microseconds.
Further, above-mentioned generation method can comprise that also the duration of described TS2 to TS6 respectively is 675 microseconds.
Further, above-mentioned generation method also can comprise, is provided with protection interval GP ' between described TS0 ' and the described TS1 ', and the duration of this GP ' is 5 milliseconds of each duration that deducts TS0 ', TS1 ' and TS2 to TS6.
Further, above-mentioned generation method also can comprise, descending master sync signal sends at last OFDM symbol of first subframe TS0 ', descending auxiliary synchronous signals sends at the penult OFDM symbol of first subframe TS0 ', supports the blind Detecting based on auxiliary synchronization channel.
The present invention also provides a kind of frame of OFDM technology under TDD mode,
Comprise two fields, each field comprises seven time slots, comprises downlink data among first time slot TS0 ', comprises upstream data among second time slot TS1 ', comprise the upstream or downstream data among the 3rd to the 7th the time slot TS2 to TS6, form front 5 milliseconds of fields of 10 milliseconds; Wherein, comprise descending auxiliary synchronous signals in the penult OFDM symbol of TS0 ', comprise descending master sync signal in last OFDM symbol of TS0 '; Comprise uplink random access signal in any one or the continuous a plurality of ascending time slot.
Further, above-mentioned frame can comprise that also for described TS0 ' and described TS1 ', the duration of regular circulation prefix is 8.333 microseconds, the duration of extended cyclic prefix is 16.667 microseconds, and the duration of a downlink or uplink signal is 66.667 microseconds;
For described TS2 to TS6, the duration of regular circulation prefix is 8.333 microseconds, and the duration of extended cyclic prefix is 17.708 microseconds, and the duration of a downlink or uplink signal is 66.667 microseconds.
Further, above-mentioned frame also can comprise, when described TS0 ' uses the regular circulation prefix, described TS0 ' comprises 10 with OFDM symbol and the descending master sync signal among the TS0 ' and the descending auxiliary synchronous signals of regular circulation prefix, all use conventional Short Length Cyclic Prefix, the duration of described TS0 ' be 10 with the OFDM symbol duration of regular circulation prefix, i.e. 750 microseconds.
Further, above-mentioned frame can comprise that also when described TS1 ' used the regular circulation prefix, the duration of described TS1 ' was 750 microseconds.
Further, above-mentioned frame also can comprise, when described TS0 ' uses extended cyclic prefix, described TS0 ' comprises 9 with OFDM symbol and the descending master sync signal among the TS0 ' and the descending auxiliary synchronous signals of extended cyclic prefix, all use extended cyclic prefix, the duration of described TS0 ' be 9 with the OFDM symbol duration of extended cyclic prefix, i.e. 750 microseconds.
Further, above-mentioned frame can comprise that also when described TS1 ' used extended cyclic prefix, the duration of described TS1 ' was 750 microseconds.
Further, above-mentioned frame can comprise that also no matter which kind of Cyclic Prefix TS0 ' and TS1 ' use, the lasting time of TS0 ' and TS1 ' all equates, i.e. 750 microseconds.
Further, above-mentioned frame can comprise that also the duration of described TS2 to TS6 respectively is 675 microseconds.
Further, above-mentioned frame also can comprise, comprises protection interval GP ' between described TS0 ' and the described TS1 ', and the duration of this GP ' is 5 milliseconds of each duration that deducts TS0 ', TS1 ' and TS2 to TS6.
Further, above-mentioned frame also can comprise, descending master sync signal sends at last OFDM symbol of first subframe TS0 ', descending auxiliary synchronous signals sends at the penult OFDM symbol of first subframe TS0 ', supports the blind Detecting based on auxiliary synchronization channel.
Compared with prior art, the present invention combines the advantage of tdd mode and OFDM technology, make system low to the susceptibility of multidiameter fading channel frequency selectivity, anti-intersymbol interference ability is strong, simultaneously, solved the problem of the primary synchronization channel wasting of resources in the existing frame structure, when the send and receive of synchronizing signal detected, the type detection of Cyclic Prefix can adopt the blind Detecting based on S-SCH to realize; Further since protection interval duration of up-downgoing increased, can effectively reduce descending to the interference between up and the adjacent base station, simultaneously, can also be according to different coverage requirements, the flexibly transmission of collocating uplink accidental access signal; Frame structure of the present invention and generation method thereof can satisfy the high demand of future communications.
Description of drawings
Fig. 1 is the schematic diagram of the second frame structure of LTE among the 3GPP;
Fig. 2 is the partial frame structural representation of the frame of OFDM technology under TDD mode in the specific embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
The frame that generates in the specific embodiment of the invention is used for the Wireless Data Transmission between base station and the travelling carriage, main design is as follows: downlink data is write among first time slot TS0 ', upstream data is write among second time slot TS1 ', the upstream or downstream data are write among the 3rd to the 7th time slot TS2～TS6, form the front 5ms field of 10ms millisecond; The rear 5ms field that forms 10ms with same method, thereby generate the radio frames of a 10ms, descending auxiliary synchronous signals is write in the penult OFDM symbol of TS0 ', descending master sync signal is write in last OFDM symbol of TS0 '; Uplink random is accessed signal to be write in any one or the continuous a plurality of ascending time slot.
Among Fig. 2, #0 to #8 represents OFDM symbol.
As shown in Figure 2, a kind of generation method of frame of OFDM technology under TDD mode, specific as follows,
Downlink data is write among first time slot TS0 ', upstream data is write among second time slot TS1 ', the upstream or downstream data are write among the 3rd to the 7th the time slot TS2 to TS6, form the front 5ms field of 10ms; Same, form the rear 5ms field of 10ms, thereby generate the radio frames of a 10ms.Wherein, the penult OFDM symbol of the TS0 ' that writes is descending auxiliary synchronous signals, and last OFDM symbol of the TS0 ' that writes is descending master sync signal; Be provided with protection interval GP ' between TS0 ' and the TS1 '; The coverage of supporting as required accesses signal (RACH) with uplink random and can write in any one or the continuous a plurality of sub-frame of uplink, in TS1 ', or among TS1 ' and the TS2, or among TS1 ', TS2 and the TS3.
Adopt the generation method of frame of the present invention, for TS0 ' and TS1 ', the duration of regular circulation prefix is 8.333us, the duration of extended cyclic prefix is the 16.667us microsecond, the duration of downlink or uplink signal when descending (be the OFDM symbol, be the SC-FDMA symbol when up) is 66.667us; For TS2～TS6, the duration of regular circulation prefix is 8.333us, and the duration of extended cyclic prefix is 17.708us, and the duration of a downlink or uplink signal is 66.667us.
When TS0 ' and TS1 ' use regular circulation prefix (Normal CP), the OFDM symbol among the described TS0 ' comprises descending master sync signal and descending auxiliary synchronous signals among the TS0 ', all uses conventional Short Length Cyclic Prefix; The duration of TS0 ' be 10 with the OFDM symbol duration of regular circulation prefix, i.e. 750us, the duration of descending master sync signal and descending auxiliary synchronous signals is 75us among the TS0 '; The duration of described TS1 ' is 750us; Be provided with protection interval GP ' between described TS0 ' and the TS1 ', the duration of GP ' is each duration that 5ms deducts TS0 ', TS1 ' and TS2～TS6, i.e. 125us.
When TS0 ' and TS1 ' use extended cyclic prefix (Extended CP), the OFDM symbol among the described TS0 ' comprises descending master sync signal and descending auxiliary synchronous signals among the TS0 ', all uses extended cyclic prefix; The duration of TS0 ' be 9 with the OFDM symbol duration of extended cyclic prefix, i.e. 750us, the duration of descending master sync signal and descending auxiliary synchronous signals is 83.333us among the TS0 '; The duration of described TS1 ' is 750us; Be provided with protection interval GP ' between described TS0 ' and the TS1 ', the duration of GP ' is that 5ms deducts, each duration of TS1 ' and TS2～TS6, i.e. 125us.
When TS0 ' uses the regular circulation prefix, described TS0 ' comprises 10 with OFDM symbol and the descending master sync signal among the TS0 ' and the descending auxiliary synchronous signals of regular circulation prefix, all use conventional Short Length Cyclic Prefix, the duration of described TS0 ' be 10 with the OFDM symbol duration of regular circulation prefix, i.e. (8.333+66.667) * 10=750us; When TS1 ' used the regular circulation prefix, the duration of described TS1 ' was 750us.
When TS0 ' uses extended cyclic prefix, described TS0 ' comprises 9 with the OFDM symbol and the descending master sync signal and the descending auxiliary synchronous signals that comprise among the TS0 ' of extended cyclic prefix, all use extended cyclic prefix, the duration of described TS0 ' be 9 with the OFDM symbol duration of extended cyclic prefix, i.e. (16.667+66.667) * 9=750us; When TS1 ' used extended cyclic prefix, the duration of described TS1 ' was 750us.
This shows that no matter which kind of Cyclic Prefix TS0 ' and TS1 ' use, the lasting time of TS0 ' and TS1 ' all equates, all is 750us; The duration of TS2～TS6 respectively is 675us; Be provided with protection interval GP ' between described TS0 ' and the TS1 ', the duration of GP ' is each duration that 5ms deducts TS0 ', TS1 ' and TS2～TS6, i.e. 125us.
A kind of frame of OFDM technology under TDD mode,
Comprise two fields, each field comprises seven time slots, comprises downlink data among first time slot TS0 ', comprises upstream data among second time slot TS1 ', comprise the upstream or downstream data among the 3rd to the 7th the time slot TS2 to TS6, form front 5 milliseconds of fields of 10 milliseconds; Wherein, comprise descending auxiliary synchronous signals in the penult OFDM symbol of TS0 ', comprise descending master sync signal in last OFDM symbol of TS0 '; Comprise uplink random access signal in any one or the continuous a plurality of ascending time slot.
The radio frames that adopts the specific embodiment of the invention to generate, descending master sync signal sends at last OFDM symbol of new first subframe TS0 ' that forms, descending auxiliary synchronous signals sends at the penult OFDM symbol of new first subframe TS0 ' that forms, such synchronizing signal method is supported the CP type blind Detecting based on auxiliary synchronization channel.
The radio frames that adopts the specific embodiment of the invention to generate, descending primary synchronization channel belongs to the subframe TS0 ' of new formation, therefore, when system bandwidth during greater than 1.25MHz, other subcarriers of descending primary synchronization channel can adopt the processing mode identical with other OFDM symbols of TS0 ' subframe to send data or control signal or pilot tone, thereby have solved the waste problem of descending primary synchronization channel upper frequency resource.
The radio frames that adopts the specific embodiment of the invention to generate, because up RACH channel bearing is in sub-frame of uplink, therefore, when system bandwidth during greater than 1.25MHz, other subcarriers of RACH channel can adopt the processing mode identical with other OFDM symbols of subframe at its place to send data or control signal or pilot tone, thereby have solved the waste problem of up RACH channel upper frequency resource.
The radio frames that adopts the specific embodiment of the invention to generate, because the duration of the new GP ' that forms has increased, therefore, even send data or control signal or pilot tone at the subcarrier except middle 1.25MHz on the primary synchronization channel, on the also greatly minimizing of impact of uplink random access signal.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. the generation method of the frame of an OFDM technology under TDD mode is characterized in that, may further comprise the steps,
Downlink data is write among first time slot TS0 ', upstream data is write among second time slot TS1 ', the upstream or downstream data are write among the 3rd to the 7th the time slot TS2 to TS6, form front 5 milliseconds of fields of 10 milliseconds; Same, form rear 5 milliseconds of fields of 10 milliseconds, thereby generate one 10 milliseconds radio frames; Wherein, descending auxiliary synchronous signals is write in the penult OFDM symbol of TS0 ', descending master sync signal is write in last OFDM symbol of TS0 '; Uplink random is accessed signal to be write in any one or the continuous a plurality of ascending time slot;
Wherein, for described TS0 ' and described TS1 ', the duration of regular circulation prefix is 8.333 microseconds, and the duration of extended cyclic prefix is 16.667 microseconds, and the duration of a downlink or uplink signal is 66.667 microseconds;
For described TS2 to TS6, the duration of regular circulation prefix is 8.333 microseconds, and the duration of extended cyclic prefix is 17.708 microseconds, and the duration of a downlink or uplink signal is 66.667 microseconds.
2. generation method as claimed in claim 1 is characterized in that,
When described TS0 ' uses the regular circulation prefix, described TS0 ' comprises 10 with OFDM symbol and the descending master sync signal among the TS0 ' and the descending auxiliary synchronous signals of regular circulation prefix, all use conventional Short Length Cyclic Prefix, the duration of described TS0 ' be 10 with the OFDM symbol duration of regular circulation prefix, i.e. 750 microseconds.
3. generation method as claimed in claim 1 is characterized in that,
When described TS1 ' used the regular circulation prefix, the duration of described TS1 ' was 750 microseconds.
4. generation method as claimed in claim 1 is characterized in that,
When described TS0 ' uses extended cyclic prefix, described TS0 ' comprises 9 with OFDM symbol and the descending master sync signal among the TS0 ' and the descending auxiliary synchronous signals of extended cyclic prefix, all use extended cyclic prefix, the duration of described TS0 ' be 9 with the OFDM symbol duration of extended cyclic prefix, i.e. 750 microseconds.
5. such as arbitrary described generation method in the claim 1,2,3,4, it is characterized in that,
When described TS1 ' used extended cyclic prefix, the duration of described TS1 ' was 750 microseconds.
6. such as arbitrary described generation method in the claim 1,2,3,4, it is characterized in that,
No matter which kind of Cyclic Prefix TS0 ' and TS1 ' use, the lasting time of TS0 ' and TS1 ' all equates, i.e. 750 microseconds.
7. such as arbitrary described generation method in the claim 1,2,3,4, it is characterized in that,
The duration of described TS2 to TS6 respectively is 675 microseconds.
8. such as arbitrary described generation method in the claim 1,2,3,4, it is characterized in that,
Be provided with protection interval GP ' between described TS0 ' and the described TS1 ', the duration of this GP ' is 5 milliseconds of each duration that deducts TS0 ', TS1 ' and TS2 to TS6.
9. such as arbitrary described generation method in the claim 1,2,3,4, it is characterized in that,
Descending master sync signal sends at last OFDM symbol of first subframe TS0 ', and descending auxiliary synchronous signals sends at the penult OFDM symbol of first subframe TS0 ', supports the blind Detecting based on auxiliary synchronization channel.
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| US8462676B2 (en) * | 2006-10-17 | 2013-06-11 | Intel Corporation | Frame structure for support of large delay spread deployment scenarios |
| CN102340796B (en) * | 2011-05-16 | 2016-06-15 | 中兴通讯股份有限公司 | Secondary synchronization channel detection method and device |
| WO2016183722A1 (en) * | 2015-05-15 | 2016-11-24 | 华为技术有限公司 | Method and system for sending and receiving information, base station, and first user equipment |
| CN107294671B (en) * | 2016-03-30 | 2021-07-30 | 中兴通讯股份有限公司 | Method and device for sending random access subframe |
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| CN1909533A (en) * | 2005-08-05 | 2007-02-07 | 中兴通讯股份有限公司 | Frame creating method based on crossing frequency division multiplexing in time-division duplex mode |
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