CN101132268B - Frame generation method based on orthogonal frequency division multiplexing technology in TDD mode - Google Patents
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Abstract
This invention discloses a method for generating frames under a TD duplex mode based on an OFDM technology, which writes down-line data into a first time slot TS0' and writes up-line data into a second time slot TS1' and writes the up or down line data into third to seventh time slots TS2-TS6 to constitute a first 5ms half-frame of the 10ms and then constitutes the latter 5ms half-frame with the same method to generate a radio frame of 10ms, writes a down-line assist synchronous signal into the second from the last OFDM symbols of the TS0' and writes the down master synchronous signal into the last OFDM symbol of the TS0' and writes random access signals of the up line into any or continuous multiple time slots of the up line.
Description
Technical field
The present invention relates to digital communicating field, particularly relate under a kind of time division duplex (TDD) pattern generation method and frame structure 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 one group of low-speed parallel data flow transmitted by 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 interference capability between anti-intersymbol interference of system (ISI) and subcarrier again.In addition bandwidth availability ratio height, realize that characteristics such as simple make OFDM more and more wider in the application of wireless communication field, such as, the wireless lan (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 the voice service of symmetry 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, can balanced easily up-downgoing business.
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 second kind of 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 7 subframes again 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 is at interval), UpPTS (uplink synchronous time slot).The last fixing transmission master sync signal (P-SCH) of DwPTS, and UpPTS inserts signal as uplink random in little coverage.Because the DwPTS time slot is a special time slot, the fixing above master sync signal that sends 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 send other data on other frequency resources on DwPTS except master sync signal, because the GP duration is too short, the data on the DwPTS will insert the uplink synchronous on the UpPTS of back and impact.Usually, because time-delay has influence on the up access signal of UpPTS, the signal of the last transmission of UpPTS is usually in the frequency range transmission different with DwPTS for fear of the data of DwPTS time slot.
In addition, under this frame structure, GP has only 50us, influencing each other between the base station is bigger, as UpPTS during as the uplink random access slot, the reception that the downstream signal of other base stations can insert the uplink random of this base station impacts, thereby influences coverage.
Summary of the invention
Generation method and frame structure based on the frame of orthogonal frequency division multiplexi is provided to provide under a kind of TDD mode technical problem to be solved by this invention, more other frequency resources on reasonable use DwPTS and the UpPTS time slot reduce mutual impact amongst base stations.
In order to solve the problems of the technologies described above, the invention provides under a kind of TDD mode generation method based on the frame of orthogonal frequency division multiplexi, 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 preceding 5ms field of 10ms; With forming the back 5ms field of 10ms with quadrat method, thereby generate the radio frames of a 10ms; In described radio frames, 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 inserted signal to be write in any one or the continuous a plurality of ascending time slot.
Further, when TS0 ' uses the regular circulation prefix, OFDM symbol among the described TS0 ', comprise descending master sync signal and descending auxiliary synchronous signals among the TS0 ', all use conventional Short Length Cyclic Prefix, the duration of described TS0 ' is the OFDM symbol duration that 675us adds a band regular circulation prefix.
Further, when TS1 ' used the regular circulation prefix, the duration of described TS1 ' was the OFDM symbol duration that 675us adds a band regular circulation prefix.
Further, when TS0 ' uses extended cyclic prefix, OFDM symbol among the described TS0 ', comprise descending master sync signal and descending auxiliary synchronous signals among the TS0 ', all use extended cyclic prefix, the duration of described TS0 ' is the OFDM symbol duration that 675us adds a band extended cyclic prefix.
Further, when TS1 ' used extended cyclic prefix, the duration of described TS1 ' was the OFDM symbol duration that 675us adds a band extended cyclic prefix.
Further, be provided with protection GP ' at interval between described TS0 ' and the TS1 ', when TS0 ' and TS1 ' use regular circulation prefix, the duration of GP ' deducts TS0 ', TS1 ' and TS2～TS6 duration for the 5ms field.
Further, be provided with protection GP ' at interval between described TS0 ' and the TS1 ', when TS0 ' and TS1 ' use extended cyclic prefix, the duration of GP ' deducts TS0 ', TS1 ' and TS2～TS6 duration for the 5ms field.
Further; when the coverage that will support during 10 kilometers left and right sides; uplink random is inserted signaling bearer to be sent in TS1 '; comprise Cyclic Prefix, leading symbol and guard time; wherein the length of leading symbol is 600us, and guard time and Cyclic Prefix are divided equally or approximate dividing equally the remaining TS1 ' time.
Further; when the coverage that will support during 60 kilometers left and right sides; uplink random is inserted signaling bearer go up transmission at TS1 ' and TS2; comprise Cyclic Prefix, leading symbol and guard time; wherein the length of leading symbol is 600us, and guard time and Cyclic Prefix are divided equally or the approximate time of dividing residue TS1 ' and TS2 equally.
Further; when the coverage that will support about 70 kilometers; and when bigger penetration loss is arranged; uplink random is inserted signaling bearer at TS1 ', and TS2 and TS3 go up and send, and comprise Cyclic Prefix, leading symbol and guard time; wherein leading symbol adopts repetitive structure; be that length is 600 * 2=1200us, guard time and Cyclic Prefix are divided equally or approximate dividing equally residue TS1 ', the time of TS2 and TS3.
In order to solve the problems of the technologies described above, the present invention also provides under a kind of TDD mode the frame structure based on orthogonal frequency division multiplexi, a radio frames comprises the field of two isometric 5ms, each field comprises 7 time slots, wherein first time slot TS0 ' is a descending time slot, second time slot TS1 ' is ascending time slot, and the penult OFDM symbol of TS0 ' is descending auxiliary synchronous signals, and last OFDM symbol of TS0 ' is descending master sync signal; Uplink random inserts signal and is arranged in any one or continuous a plurality of ascending time slot.
Further, when TS0 ' and TS1 ' use regular circulation prefix, 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 described TS0 ' and TS1 ' is the OFDM symbol duration that 675us adds a band regular circulation prefix; Be provided with protection GP ' at interval between described TS0 ' and the TS1 ', the duration of GP ' is that 5ms deducts TS0 '～TS6 duration.
Further, when TS0 ' and TS1 ' use extended cyclic prefix, 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 described TS0 ' and TS1 ' is the OFDM symbol duration that 675us adds a band extended cyclic prefix; Be provided with protection GP ' at interval between described TS0 ' and the TS1 ', the duration of GP ' is that 5ms deducts TS0 '～TS6 duration.
Further; when the coverage that will support during 10 kilometers left and right sides; described uplink random inserts signal and is arranged in TS1 '; comprise Cyclic Prefix, leading symbol and guard time; wherein the length of leading symbol is 600us, and guard time and Cyclic Prefix are divided equally or approximate dividing equally the remaining TS1 ' time.
Further; when the coverage that will support during 60 kilometers left and right sides; described uplink random inserts signal and is arranged in TS1 ' and TS2; comprise Cyclic Prefix, leading symbol and guard time; wherein the length of leading symbol is 600us, and guard time and Cyclic Prefix are divided equally or the approximate time of dividing residue TS1 ' and TS2 equally.
Further; when the coverage that will support about 70 kilometers; and when bigger penetration loss is arranged; described uplink random inserts signal and is positioned at TS1 ', among TS2 and the TS3, comprises Cyclic Prefix, leading symbol and guard time; wherein leading symbol adopts repetitive structure; be that length is 600 * 2=1200us, guard time and Cyclic Prefix are divided equally or approximate dividing equally residue TS1 ', the time of TS2 and TS3.
The present invention combines the advantage of tdd mode and OFDM technology, makes system low to the susceptibility of multidiameter fading channel frequency selectivity, and anti-intersymbol interference ability is strong, simultaneously, has solved the problem of the primary synchronization channel wasting of resources in the existing frame structure.When the transmission of synchronizing signal detected with reception, the type detection of Cyclic Prefix can adopt the blind Detecting based on S-SCH to realize.Further and since the protection of up-downgoing at interval the duration 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 transmission of collocating uplink accidental access signal flexibly.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 second kind of frame structure of LTE among the 3GPP;
Fig. 2 is the partial frame structural representation of the embodiment of the invention;
Fig. 3～5th, the partial frame structural representation of application example of the present invention.
Embodiment
The frame that the embodiment of the invention generates is used for the wireless data transmission between base station and the travelling carriage, and concrete steps are 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 preceding 5ms field of 10ms; With forming the back 5ms field of 10ms with quadrat method, 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 GP ' at interval between TS0 ' and the TS1 '; The coverage of Zhi Chiing as required inserts signal (RACH) with uplink random and can write in any one or the continuous a plurality of sub-frame of uplink, as among the TS1 ' or among TS1 ' and the TS2 or TS1 ', among TS2 and the TS3.
RACH can be according to coverage requirement, and configuration flexibly specifically, when the coverage that will support during 10 kilometers left and right sides (general coverage), sends the RACH signaling bearer in TS1 '; Wherein TS1 ' comprises Cyclic Prefix, leading symbol and guard time, and wherein the length of leading symbol is 600us, and guard time and Cyclic Prefix can be divided equally or approximate dividing equally the remaining TS1 ' time.
When the coverage that will support during 60 kilometers left and right sides (than large coverage); the RACH signaling bearer is gone up transmission at TS1 ' and TS2; TS1 ' and TS2 comprise Cyclic Prefix, leading symbol and guard time; wherein the length of leading symbol is 600us, and guard time and Cyclic Prefix can be divided equally or the approximate time of dividing residue TS1 ' and TS2 equally.
When the coverage that will support when (more large coverage) and penetration loss are big about 70 kilometers; with the RACH signaling bearer at TS1 '; TS2 and TS3 go up and send; TS1 '; TS2 and TS3 comprise Cyclic Prefix, leading symbol and guard time, and wherein leading symbol adopts repetitive structure, and promptly length is 600 * 2=1200us; guard time and Cyclic Prefix can be divided equally or approximate dividing equally residue TS1 ', the time of TS2 and TS3.
When TS0 ' and TS1 ' used conventional CP (Normal CP), the OFDM symbol among the described TS0 ' comprised descending master sync signal and descending auxiliary synchronous signals among the TS0 ', all uses conventional Short Length Cyclic Prefix; The duration of TS0 ' is the OFDM symbol duration that 675us adds a band regular circulation prefix, i.e. 750us, and the duration of descending master sync signal and descending auxiliary synchronous signals is 75us among the TS0 '; The duration of described TS1 ' is the OFDM symbol duration that 675us adds a band regular circulation prefix, i.e. 750us; Be provided with protection GP ' at interval between described TS0 ' and the TS1 ', the duration of GP ' is that 5ms deducts TS0 '～TS6 duration, i.e. 125us.
When TS0 ' and TS1 ' use expansion CP (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 ' is the OFDM symbol duration that 675us adds a band extended cyclic prefix, i.e. 759.375us, and the duration of descending master sync signal and descending auxiliary synchronous signals is 84.375us among the TS0 '; The duration of described TS1 ' is the OFDM symbol duration that 675us adds a band extended cyclic prefix, i.e. 759.375us; Be provided with protection GP ' at interval between described TS0 ' and the TS1 ', the duration of GP ' is that 5ms deducts TS0 '～TS6 duration, i.e. 106.25us.
Wherein, the CP type can change based on time slot, and generally speaking, TS0 ' is to use identical CP length with TS1 ', but TS2～TS6 just can use conventional CP, also can use expansion CP.
The present invention is described in detail below in conjunction with drawings and the specific embodiments.
As shown in Figure 1, be second kind of frame structure schematic diagram of current LTE.The radio frames of 10ms comprises two fields that 5ms is isometric, and each field comprises 7 subframes and (also claims time slot, be respectively TS0～TS6).Wherein, number of samples is counted for sampling, and promptly the time be multiply by sample rate, because sample rate is generally 30.72 * 10
6Hz, so, the sampling point of the radio frames of 10ms is 307200 sampling points, and the field of 5ms is 15600 sampling points, and 1 time slot is 0.675ms, i.e. 20736 sampling points, by that analogy.First time slot TS0 is fixed as descending time slot, and second time slot TS1 is fixed as ascending time slot, and three special time slot: DwPTS, GP, UpPTS are arranged between TS0 and TS 1.DwPTS is last fixing to send master sync signal, and UpPTS in little coverage as RACH.
As described in Figure 2, be the partial frame structural representation of the embodiment of the invention.With second kind of frame of current LTE relatively, the embodiment of the invention is that first subframe TS0 and DwPTS time slot are merged into a new time slot, is called TS0 ', and it is relevant with the CP type of TS0 use originally wherein to merge to the time that the DwPTS time slot of TS0 ' continues; Simultaneously UpPTS time slot and second subframe TS1 are merged into a new time slot, are called TS1 ', wherein, it is relevant with the CP type of original TS1 use to merge to the time that the UpPTS time slot of TS1 ' continues; Originally the time altogether of three special time slots removes the DwPTS that merges to TS0 ' and merges to the time that obtains behind the UpPTS of TS1 ', forms new protection at interval, is GP ', and the duration of GP ' is also relevant with the CP type that current subframe is used.Remaining subframe TS2～TS6 remains unchanged.
Specifically, when TS0 ' and the conventional CP of TS1 ' use, the duration of TS0 ' is 750us, and the duration that merges to the DwPTS time slot of TS0 ' is 75us; The duration of TS1 ' is 750us, and the duration that merges to the UpPTS time slot of TS1 ' is 75us; The duration of the new GP ' that forms is 125us.When TS0 ' and TS1 ' use expansion CP, the duration of TS0 ' is 759.375us, and the duration that merges to the DwPTS time slot of TS0 ' is 84.375us; The duration of TS1 ' is 759.375us, and the duration that merges to the UpPTS time slot of TS1 ' is 84.375us; The duration of the new GP ' that forms is 106.25us.
To make up by TS0 ', GP ', TS1 ' and original T S2～TS6 that above-mentioned steps generates, obtain the field of a 5ms, the field of another 5ms is adopted in a like fashion and is formed, and the field of two 5ms is combined to form the radio frames of a 10ms.
The radio frames that adopts the embodiment of the invention to generate, descending master sync signal sends on last OFDM symbol of new first subframe TS0 ' that forms, descending auxiliary synchronous signals sends on 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 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 signaling or pilot tone, thereby have solved the waste problem of descending primary synchronization channel upper frequency resource.
The radio frames that adopts the 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 signaling or pilot tone, thereby have solved the waste problem of up RACH channel upper frequency resource.
The radio frames that adopts the embodiment of the invention to generate, because the duration of the new GP ' that forms has increased, therefore, even send data or control signaling or pilot tone on the primary synchronization channel on except the subcarrier of middle 1.25MHz, the influence that uplink random is inserted signal also reduces greatly.
Fig. 3 is after adopting the wireless frame structure of embodiment of the invention generation, supports TS1 ' the partial frame structural representation of general coverage (10.86 kilometers).In this schematic diagram, RACH goes up at the subframe TS1 ' of above-mentioned new formation and sends, and the duration of TS1 ' is 750us, and wherein the duration of CP is 77.6us, and the duration of Preamble is 600us, and the duration of GT is 72.4us.
Fig. 4 after adopting the wireless frame structure of embodiment of the invention generation, supports TS1 ' and TS2 partial frame structural representation than large coverage (61.3 kilometers).In this schematic diagram, RACH goes up transmission at the subframe TS1 ' and the TS2 of above-mentioned new formation, and the duration of TS1 ' and TS2 is 1434.375us, wherein, the duration of CP is 425.68us, and the duration of Preamble is 600us, and the duration of GT is 408.69us.
Fig. 5 after adopting the wireless frame structure of embodiment of the invention generation, supports more TS1 ', TS2 and the TS3 partial frame structural representation of large coverage (66.9 kilometers).In this schematic diagram, RACH is in subframe TS1 ' and the TS2 and the upward transmission of TS3 of above-mentioned new formation, the duration of TS1 '～TS3 is 2109.375us, wherein, the duration of CP is 463.18us, Preamble adopts repetitive structure, and total duration is 1200us, and the duration of GT is 446.19us.
Among the present invention,, can adopt frequency domain to handle, reduce complexity, improve the detection performance that inserts at random because RACH has adopted the structure of band CP.On the other hand, among the present invention, the leading symbol of RACH (Preamble) duration is 600us, and is relatively long, thereby more helps detecting the raising of performance.
Those skilled in the art that should be understood that the above only is preferred embodiment of the present invention, are not to be used for limiting practical range of the present invention; Everyly do equivalence according to the present invention and change and revise, all contained by the scope of claim of the present invention.
Claims (10)
- Under the TDD mode based on the generation method of the frame of orthogonal frequency division multiplexi, it is characterized in that, 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 preceding 5ms field of 10ms; With forming the back 5ms field of 10ms with quadrat method, thereby generate the radio frames of a 10ms; In described radio frames, 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 inserted signal to be write in any one or the continuous a plurality of ascending time slot.
- 2. generation method according to claim 1, it is characterized in that, when TS0 ' uses the regular circulation prefix, OFDM symbol among the described TS0 ', comprise descending master sync signal and descending auxiliary synchronous signals among the TS0 ', all use conventional Short Length Cyclic Prefix, the duration of described TS0 ' is the OFDM symbol duration that 675 μ s add a band regular circulation prefix.
- 3. generation method according to claim 1 is characterized in that, when TS1 ' used the regular circulation prefix, the duration of described TS1 ' was the OFDM symbol duration that 675 μ s add a band regular circulation prefix.
- 4. generation method according to claim 1, it is characterized in that, when TS0 ' uses extended cyclic prefix, OFDM symbol among the described TS0 ', comprise descending master sync signal and descending auxiliary synchronous signals among the TS0 ', all use extended cyclic prefix, the duration of described TS0 ' is the OFDM symbol duration that 675 μ s add a band extended cyclic prefix.
- 5. generation method according to claim 1 is characterized in that, when TS1 ' used extended cyclic prefix, the duration of described TS1 ' was the OFDM symbol duration that 675 μ s add a band extended cyclic prefix.
- 6. generation method according to claim 1; it is characterized in that; be provided with protection GP ' at interval between described TS0 ' and the TS1 '; TS0 ', GP ', TS1 ' and TS2～TS6 combination; obtain the field of a 5ms; when TS0 ' and TS1 ' use regular circulation prefix, the duration of GP ' deducts TS0 ', TS1 ' and TS2～TS6 duration for the 5ms field.
- 7. generation method according to claim 1; it is characterized in that; be provided with protection GP ' at interval between described TS0 ' and the TS1 '; TS0 ', GP ', TS1 ' and TS2～TS6 combination; obtain the field of a 5ms; when TS0 ' and TS1 ' use extended cyclic prefix, the duration of GP ' deducts TS0 ', TS1 ' and TS2～TS6 duration for the 5ms field.
- 8. generation method according to claim 1; it is characterized in that; when the coverage that will support during 10 kilometers left and right sides; uplink random is inserted signaling bearer to be sent in TS1 '; comprise Cyclic Prefix; leading symbol and guard time; wherein the length of leading symbol is 600 μ s; guard time and Cyclic Prefix are divided equally or approximate dividing equally the remaining TS1 ' time; describedly approximate divide the remaining TS1 ' time equally and refer to; the duration of TS1 ' is 750 μ s; the duration of leading symbol is 600 μ s, and the duration of Cyclic Prefix is 77.6 μ s, and the duration of guard time is 72.4 μ s.
- 9. generation method according to claim 1; it is characterized in that; when the coverage that will support during 60 kilometers left and right sides; uplink random is inserted signaling bearer go up transmission at TS1 ' and TS2; comprise Cyclic Prefix; leading symbol and guard time; wherein the length of leading symbol is 600 μ s; guard time and Cyclic Prefix are divided equally or the approximate time of dividing residue TS1 ' and TS2 equally; the described approximate time of dividing residue TS1 ' and TS2 equally refers to; the duration of TS1 ' and TS2 is 1434.375 μ s; the duration of leading symbol is 600 μ s, and the duration of Cyclic Prefix is 425.68 μ s, and the duration of guard time is 408.69 μ s.
- 10. generation method according to claim 1; it is characterized in that; when the coverage that will support about 70 kilometers; and when bigger penetration loss is arranged; uplink random is inserted signaling bearer at TS1 '; TS2 and TS3 go up and send; comprise Cyclic Prefix; leading symbol and guard time; wherein leading symbol adopts repetitive structure; be that length is 600 * 2=1200 μ s, guard time and Cyclic Prefix are divided equally or approximate dividing equally residue TS1 ', the time of TS2 and TS3; the described approximate residue TS1 ' that divides equally; the time of TS2 and TS3 refers to, and the duration of TS1 '～TS3 is 2109.375 μ s, and the duration of leading symbol is 1200 μ s; the duration of Cyclic Prefix is 463.18 μ s, and the duration of guard time is 446.19 μ s.
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| CN101141187B (en) * | 2007-10-12 | 2013-01-16 | 中兴通讯股份有限公司 | Method of generating frame of OFDM technology under TDD mode |
| CN101527595B (en) * | 2008-03-07 | 2013-02-27 | 中兴通讯股份有限公司 | Frame structure of time division duplex system and method for sending synchronous signals |
| US8923197B2 (en) * | 2011-06-01 | 2014-12-30 | Samsung Electronics Co., Ltd. | Methods and apparatus to transmit and receive synchronization signal and system information in a wireless communication system |
| CN103796330B (en) * | 2012-11-02 | 2017-11-10 | 电信科学技术研究院 | The transmission of RACH and method of reseptance and equipment |
| CN106685877A (en) * | 2014-03-28 | 2017-05-17 | 上海数字电视国家工程研究中心有限公司 | Processing method of received signals of receiving end |
| CN109716840A (en) * | 2016-09-28 | 2019-05-03 | 华为技术有限公司 | Data transmission method, base station and user equipment |
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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 |
| CN101009513A (en) * | 2006-01-26 | 2007-08-01 | 上海原动力通信科技有限公司 | Cell synchronization method and initial cell searching method for broadband time-division dual-duplex cellular system |
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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 |
| CN101009513A (en) * | 2006-01-26 | 2007-08-01 | 上海原动力通信科技有限公司 | Cell synchronization method and initial cell searching method for broadband time-division dual-duplex cellular system |
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