CN101374012B - Wireless transmission method for TDD OFDM system and physical layer frame structure - Google Patents
Wireless transmission method for TDD OFDM system and physical layer frame structure Download PDFInfo
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Abstract
The invention discloses a wireless communication method of a TDD OFDM wireless communication system, and a physical layer frame structure for realizing the communication method. The physical layer frame is divided into two sub-frames with the same duration and structure, each sub-frame comprises a plurality of regular service time slots and two guard periods (i.e. a first guard period and a second guard period). During conducing wireless transmission, each sub-frame sends a downlink service control message by using a regular time slot, receives uplink service by using one or more regular time slots after pausing for a period of time, and sends downlink service by using one or more regular time slots after pausing for a period of time. By using the provided physical layer frame structure, the time slot resources can be flexibly adjusted according to the specific statues of the uplink service and the downlink service during transmission, thereby improving the utilization ratio of system resources; and the allocation of the first guard period and the second guard period inhibit the interference between the uplink signals ant the downlink signals.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to radio transmitting method and the physical layer frame structure of a kind of time division duplex (TDD) OFDM (OFDM, Orthogonal Frequency Division Multiplexing) communication system.
Background technology
Physical layer frame structure is the basis of any communication system, and namely each communication system all includes unique separately physical layer frame structure.In the physical layer design process, need to take into full account and weigh the factors such as resource utilization (such as spectrum efficiency etc.), multiple access (access) mode, key technology for PHY, realization feasibility of communication system.
As one of 3G (Third Generation) Moblie standard, physical layer frame equally also is the basis of TD-SCDMA system to TD-SCDMA (Time Division-Synchronized Code Division MultipleAccess, TD SDMA access).TD SDMA (the LCR TDD of low spreading rate (LCR); TD-SCDMA) core of the physical layer frame structure of system is: each subframe comprises 7 conventional time slots and 3 special time slots, and 3 special time slots wherein are followed successively by descending pilot frequency time slot (DwPTS), protection interval (GP) and uplink pilot time slot (UpPTS).
Protection interval GP comes downwards to the up transfer point except being used for, and the length of its 96 chips (i.e. 75 μ s) is one of key factor of determining cell coverage area, can weaken to a certain extent downstream signal to the interference of upward signal simultaneously.Although GP length can satisfy most application scenarios, yet can find according to the field testing conclusion, in specific identical networking environment, such as environment such as spaciousness, basin, the minizone is similar to the line-of-sight propagation environment, so adjacent cell, more the downstream signal of the through or Multi reflection of far end cell may be still forms more serious interference to the upward signal of this residential quarter, affect the entire system performance.
In the conventional time slot of TD-SCDMA (LCR TDD) system, except data block and intermediate code, also there is the fixedly slot time of 16 chips (i.e. 12.5 μ s), in order to suppress the multidiameter delay expansion, realize simultaneously the configuration of uplink/downlink transfer point.
Be that CN200510053780, publication number are CN1832378, the day for announcing to be in the Chinese patent " method of radio transmission using high-efficient high performance frame structure for wide-band TDD system " on September 13rd, 2006 at application number, provided a kind of frame structure based on wideband time division duplexing TDD system.This kind frame structure comprises:
With one fixedly the sub-frame division of duration be several basic time slots and several special time slots, wherein utilize a basic time slot downlink transfer Cell Broadcast CB or paging information, with remaining basic slot transmission up with downlink business information; When needs improve the transfer rate capabilities of single time slot, the basic time slot of part is merged into some expansion time slots, with expanding slot transmission and expanding the high speed business that slot length is complementary.The described method of this patent has been pointed out a kind of developing direction of TDD system rear three generations, yet described frame structure can be thought a kind of improvement of TD-SCDMA system frame structure, and the basic structure between the two is similar.
Along with the research and development (B3G, 4G) of Next-Generation Wireless Communication Systems, OFDM (OFDM) technology has the trend that progressively replaces CDMA technology, and OFDM has almost become the sign of new generation of wireless communication core technology.Yet, for ofdm communication system, because all there is Cyclic Prefix (CP) in each symbol, therefore need not reserved category like the slot time in the conventional time slot of TD-SCDMA system physical layer frame structure.But, how better to guarantee the utilance of ofdm communication system resource, and the interference that how to suppress the uplink and downlink signal, the problem that the ofdm communication system physical layer frame structure need to be considered become when framing and transmission.
Summary of the invention
Technical problem to be solved by this invention is, a kind of TDD OFDM wireless communication system radio transmitting method and physical layer frame structure are provided, so that the physical layer frame structure carrying wireless signal that is provided to be provided, realize wireless transmission, when transmission, improve the utilance of system resource, suppress the interference of uplink and downlink signal simultaneously.
The invention provides a kind of radio transmitting method of TDD OFDM system, be used for base station or intermediate node and realize wireless traffic is received and sends, in each subframe of the physical layer frame of carrying wireless traffic:
(1) transceiver sends downlink information in first conventional business time-slot;
(2) then, after pause first is protected the duration at interval and finished the downstream-to-upstream conversion, in N conventional business time-slot as ascending time slot, receive uplink business data;
(3) then, at the duration at the second protection interval of pausing and finish be up to down conversion after, in M conventional business time-slot as descending time slot, send downlink service data;
Wherein, the value of N, M is 0 or positive integer, and N and M sum add 1 and equal the total number of conventional business time-slot that disposes in the subframe.
The Cyclic Prefix of OFDM symbol in the conventional business time-slot of each of described physical layer frame is configured to according to different application scenarioss:
Short Cyclic Prefix, its duration scope is 4 μ s≤T
S≤ 6 μ s are used for hour prolonging expansion; Or,
Long loop prefix, its duration scope are 15 μ s≤T
L≤ 25 μ s are used for or the long time delay expansion; Or
The overlength Cyclic Prefix, its duration scope is T
SL〉=30 μ s are used for the expansion of super large time delay.
For the situation of short Cyclic Prefix or long loop prefix, the number of the OFDM symbol in each conventional business time-slot is configured to even number.For the situation of short Cyclic Prefix or long loop prefix, the number of the OFDM symbol in each conventional business time-slot is configured to the number of 2 power side.
Described the first protection interval is greater than described the second protection interval.The duration at the first protection interval described in the step (2) is that the situation according to signal coverage distance in the wireless communication system is configured:
For small distance covering and descending in the insignificant situation of up interference, this the first protection interval is divided into forward and backward two parts, its front portion and described first conventional business time-slot constitute jointly first conventional business time-slot of overlength, are used at the common transmission of step (1) downlink business; And this remaining rear portion, the first protection interval consists of the first protection interval of brachymemma, and conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot of overlength; Perhaps,
In super covering far away or descending situation to up serious interference; this first protection interval and the one or more continuous conventional business time-slots that link to each other are thereafter united consist of the first protection interval that lengthens, for the conversion that behind first conventional business time-slot, pauses with downstream-to-upstream.
The present invention also provides a kind of physical layer frame structure for described radio transmitting method, is used for the wireless traffic of carrying TDD OFDM system base station or intermediate node transmitting-receiving, comprises again in each subframe of described physical layer frame:
First conventional business time-slot that is used for bearing downlink information of subframe section start;
N uplink conventional business time-slot that is used for the carrying uplink service;
M descending conventional business time-slot that is used for the bearing downlink business;
The first protection interval, between described first conventional business time-slot and N uplink conventional business time-slot, to descending time slot and ascending time slot in the enterprising between-line spacing of time domain and finish the conversion of downstream-to-upstream;
The second protection interval, between the individual descending conventional business time-slot of described N uplink conventional business time-slot and M, to ascending time slot and descending time slot in the enterprising between-line spacing of time domain and finish and be up to descending conversion;
Wherein, the value of N, M is 0 or positive integer, and N and M sum add 1 again and equal the total number of conventional business time-slot that disposes in the subframe.
The Cyclic Prefix of OFDM symbol in the conventional business time-slot of each of described physical layer frame, the duration of service based time slot is configured to according to different application scenarioss:
Short Cyclic Prefix, its duration scope is 4 μ s≤T
S≤ 6 μ s are used for hour prolonging expansion; Or,
Long loop prefix, its duration scope are 15 μ s≤T
L≤ 25 μ s are used for or the long time delay expansion; Or
The overlength Cyclic Prefix, its duration scope is T
SL〉=30 μ s are used for the expansion of super large time delay.
For the situation of short Cyclic Prefix or long loop prefix, the OFDM symbol number in each conventional business time-slot is configured to even number.For the situation of short Cyclic Prefix or long loop prefix, the OFDM symbol number in each conventional business time-slot is configured to the number of 2 power side.
Described the first protection interval is greater than described the second protection interval.Described the first protection interval is that the situation according to signal coverage distance in the wireless communication system is configured:
For small distance covering and descending in the insignificant situation of up interference, this the first protection interval is divided into forward and backward two parts, its front portion and described first conventional business time-slot constitute jointly first conventional business time-slot of overlength, are used for common transmission downlink business; And this remaining rear portion, the first protection interval consists of the first protection interval of brachymemma, configurating downlink/up transfer point in the first protection interval of described brachymemma;
Perhaps; in super covering far away or descending situation to up serious interference; the the first protection interval that consists of lengthening is united with the one or more continuous conventional business time-slot that links to each other thereafter in this first protection interval, configurating downlink/up transfer point in the first protection interval of described lengthening.
Described physical layer frame structure is at the random access procedure of portable terminal, and random access procedure is configured in the subframe in last uplink service time slot, perhaps is configured in the uplink service time slot away from descending/up transfer point.
Use radio transmitting method of the present invention; based on described physical layer frame structure; the physical layer frame structure carrying wireless signal that provides is provided; realized wireless transmission; can be according to the concrete condition of up-downgoing business when transmission; adjust flexibly the time interval resource of distributing to up-downgoing, improved the utilance of system resource, the while is suppressed the uplink and downlink signal owing to the configuration at first, second protection interval interference.
Description of drawings
Fig. 1 is the general physical layer frame structure schematic diagram of TDD OFDM wireless communication system in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and the specific embodiments technical solutions according to the invention are described further.
Main thought of the present invention is, the physical layer frame structure that a kind of wireless communications method is provided and realizes this communication means for TDD OFDM wireless communication system.With isostructural two subframes of duration such as physical layer frame are divided into, comprise again some conventional business time-slots and two protection intervals in each subframe, i.e. the first protection interval and the second protection interval.When carrying out wireless transmission, utilize first a conventional time slot to send the downlink business control information, pause a period of time afterwards, recycle one or more conventional business time-slots and receive uplink service, pause a period of time more afterwards, recycle one or more conventional business time-slots and send downlink business.
Described physical layer frame structure and radio transmitting method are applicable to the base station or are used for the intermediate node of forwarding or relaying, realize carrying out transmission of wireless signals by transceiver.
The radio transmitting method of a kind of TDD OFDM system of the present invention is used for base station or intermediate node and realizes wireless traffic is received and sends, in each subframe of the physical layer frame of carrying wireless traffic:
(1) transceiver sends downlink information in first conventional business time-slot;
(2) then, after pause first is protected the duration at interval and finished the downstream-to-upstream conversion, in N conventional business time-slot as ascending time slot, receive uplink business data;
(3) then, at the duration at the second protection interval of pausing and finish be up to down conversion after, in M conventional business time-slot as descending time slot, send downlink service data;
Wherein, the value of N, M is 0 or positive integer, and N and M sum add 1 and equal the total number of conventional business time-slot that disposes in the subframe.
The Cyclic Prefix of OFDM symbol in the conventional business time-slot of each of described physical layer frame is configured to according to different application scenarioss:
Short Cyclic Prefix, its duration scope is 4 μ s≤T
S≤ 6 μ s are used for hour prolonging expansion; Or,
Long loop prefix, its duration scope are 15 μ s≤T
L≤ 25 μ s are used for or the long time delay expansion; Or
The overlength Cyclic Prefix, its duration scope is T
SL〉=30 μ s are used for the expansion of super large time delay.
For the situation of short Cyclic Prefix or long loop prefix, the number of the OFDM symbol in each conventional business time-slot is configured to even number.Preferred disposition is the number of 2 power side.
Described the first protection interval is greater than described the second protection interval.The duration at described the first protection interval is that the situation according to signal coverage distance in the wireless communication system is configured:
For small distance covering and descending in the insignificant situation of up interference, this the first protection interval is divided into forward and backward two parts, its front portion and described first conventional business time-slot constitute jointly first conventional business time-slot of overlength, are used at the common transmission of step (1) downlink business; And this remaining rear portion, the first protection interval consists of the first protection interval of brachymemma, and conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot of overlength; Perhaps,
In super covering far away or descending situation to up serious interference; this first protection interval and the one or more continuous conventional business time-slots that link to each other are thereafter united consist of the first protection interval that lengthens, for the conversion that behind first conventional business time-slot, pauses with downstream-to-upstream.
(1) transceiver sends the downlink business control information in first conventional business time-slot TS0;
In described first conventional business time-slot TS0, also send synchronous channel SCH and broadcast channel BCH, map to respectively the duration of one or more OFDM symbols.Further, the sequential of described synchronous channel SCH is positioned at before the broadcast channel BCH.
(2) then, after the duration at the first protection interval that pauses, in the one or more conventional business time-slot as ascending time slot, receive uplink business data;
Wherein, by disposing the descending/up transfer point DUSP duration at the first protection interval of realizing pausing.This descending/up transfer point DUSP is in the first protection interval, and the conversion of downstream-to-upstream is carried out in indication, finishes conversion and get final product in the first protection interval, and namely the duration at the first protection interval comprises transfer point.Usually, the duration at the first protection interval is a fixing duration, namely is first a basic protection interval.The duration at the first protection interval also can be that the situation according to signal coverage distance in the wireless communication system is configured:
For small distance covering and descending in the insignificant situation of up interference, this the first protection interval is divided into forward and backward two parts, its front portion and described first conventional business time-slot constitute jointly first conventional business time-slot of overlength, are used at the common transmission of step (1) downlink business; And this remaining rear portion, the first protection interval consists of the first protection interval of brachymemma, is used for pausing behind first conventional business time-slot of overlength; Perhaps,
In super covering far away or descending situation to up serious interference; this first protection interval and the one or more continuous conventional business time-slots that link to each other are thereafter united consist of the first protection interval that lengthens, for behind first conventional business time-slot, pausing.
(3) then, after the duration at the second protection interval that pauses, in the one or more conventional business time-slot as descending time slot, send downlink service data.
Wherein, according to the uplink/downlink transfer point UDSP of the configuration duration at the second protection interval of realizing pausing.This uplink/downlink transfer point UDSP is in the second protection interval, and indication is up to descending conversion, finishes conversion and get final product in the second protection interval, and namely the duration at the second protection interval comprises transfer point.
The Cyclic Prefix of OFDM symbol in each conventional business time-slot of physical layer frame based on the time slot duration, is configured to according to different application scenarioss:
Short Cyclic Prefix, its duration scope is 4 μ s≤T
S≤ 6 μ s are used for hour prolonging expansion; Or,
Long loop prefix, its duration scope are 15 μ s≤T
L≤ 25 μ s are used for or the long time delay expansion; Or
The overlength Cyclic Prefix, its duration scope is T
SL〉=30 μ s are used for the expansion of super large time delay.
Especially, for the situation of short Cyclic Prefix or long loop prefix, the OFDM symbol number in each conventional business time-slot is configured to even number, preferentially is configured to the number of 2 power side, to satisfy the demand of spread spectrum.
Described the first protection interval is greater than described the second protection interval.The first protection interval is descending except comprising/up transfer point DUSP, realize outside the conversion to downstream-to-upstream, and also realize suppressing descending function to uplink interference, thereby the first protection interval is set usually greater than described the second protection interval.
Access in (HSDPA) situation in multimedia broadcasting and multicast service (MBMS), high speed downlink packet, in the step (2), after the duration at the first protection interval that pauses, directly forward step (3) to; In the step (3), after the duration that continues pause the second protection interval, send downlink service data in the conventional business time-slot of all conventional business time-slot except first, first conventional business time-slot also can send downlink service data.Be suitable for the situation that downlink business occupies, especially wireless traffic all is the situation of downlink business.
In high speed downlink packet access (HSUPA) situation, in the step (2), after the duration at the first protection interval that pauses, receive uplink business data in the conventional business time-slot of all conventional business time-slot except first; In the step (3), the duration at the second protection interval of only pausing.Be suitable for the situation that uplink service occupies, especially wireless traffic all is the situation of uplink service.
Base station or intermediate node are configured in random access procedure in the subframe in last uplink service time slot in the random access procedure of portable terminal, perhaps are configured in the uplink service time slot away from descending/up transfer point DUSP.
Adopt above-mentioned radio transmitting method, can be in the base station or intermediate node realize the wireless traffic transmission.Correspondingly, realize described radio transmitting method, also need to have a kind of physical layer frame structure that adapts.
A kind of physical layer frame structure for described radio transmitting method is used for the wireless traffic that carrying TDD OFDM system base station or intermediate node are received and dispatched, and comprises again in each subframe of described physical layer frame:
First conventional business time-slot that is used for bearing downlink information of subframe section start;
N uplink conventional business time-slot that is used for the carrying uplink service;
M descending conventional business time-slot that is used for the bearing downlink business;
The first protection interval, between described first conventional business time-slot and N uplink conventional business time-slot, to descending time slot and ascending time slot in the enterprising between-line spacing of time domain and finish the conversion of downstream-to-upstream;
The second protection interval, between the individual descending conventional business time-slot of described N uplink conventional business time-slot and M, to ascending time slot and descending time slot in the enterprising between-line spacing of time domain and finish and be up to descending conversion;
Wherein, the value of N, M is 0 or positive integer, and N and M sum add 1 again and equal the total number of conventional business time-slot that disposes in the subframe.
As shown in Figure 1, show the embodiment of a physical layer frame structure of the present invention, provided in this embodiment the general physical layer frame structure schematic diagram of TDD OFDM wireless communication system.
Wherein, the radio frames of each 10ms is divided into two isostructural 5ms subframes, and each subframe comprises again N conventional business time-slot (TS) and two protection intervals (GP1 and GP2).
Take the situation of 20kHz subcarrier spacing as example, each subframe can be divided into again N=11 conventional business time-slot that waits duration, and (TS0～TS10), wherein, described first conventional business time-slot TS0 is configured to descending time slot.In first conventional business time-slot TS0, also dispose synchronizing channel (SCH) and broadcast channel (BCH), map to respectively the duration of one or more OFDM symbols, the sequential of SCH can be positioned at before the BCH.
First protection interval (GP1) is between TS0 and TS 1, and second protection interval (GP2) can be configured in the back that is right after GP1 or any one the conventional business time-slot except TS0 according to the uplink and downlink service traffics.Further, descending/up transfer point (Downlink Uplink SwitchingPoint, DUSP) is configured in the GP1, and uplink/downlink transfer point (Uplink Downlink SwitchingPoint, UDSP) is configured in the GP2.
Physical layer frame structure parameter shown in Figure 1 is as shown in table 1 below.
Table 1 physical layer frame structure parameter
| Duration (μ s) | |
| Conventional business time-slot TS | 437.5 |
| Basic GP1 (DUSP) | 177.5 |
| GP2(UDSP) | 10 |
In TDD OFDM wireless communication system, the duration of service based time slot, the Cyclic Prefix of OFDM symbol (CP) comprises short CP, long CP and overlength CP three classes in the physical layer frame, to satisfy different application scenarioss.The duration scope of wherein, lacking CP is 4 μ s≤T
S≤ 6 μ s, the duration scope of long CP is 15 μ s≤T
L≤ 25 μ s, the duration scope of overlength CP is T
SL〉=30 μ s.
As shown in table 2, provided three kinds of typical CP duration parameters and application scenarios.
The typical CP duration of table 2
| The CP type | Duration (μ s) | Application scenarios |
| Short CP | 4.6875 | Hour prolong expansion |
| Long CP | 22.65625 | In or long time delay expansion |
| Overlength CP | 37.5 | The expansion of super large time delay |
For the situation of short CP and long CP, the OFDM symbolic number in each conventional business time-slot is configured to even number, preferentially is configured to the number of 2 power side, to satisfy the demand of spread spectrum.Particularly, for short CP, the OFDM symbolic number in each conventional business time-slot can be configured to 2
3=8, for long CP, configurable 6 OFDM symbolic numbers in each conventional business time-slot.
According to the situation of signal coverage distance in the TDD OFDM wireless communication system, following variation also can be done in described first protection interval (GP1):
(1) for small distance covering and descending in the insignificant situation of up interference:
First protection interval GP1 can be divided into forward and backward two parts, and the front portion of GP1 can constitute jointly with first conventional business time-slot TS0 the TS0 of overlength, is used for common transmitting downlink data; And the remainder (being the rear portion) of first protection interval GP1 consists of the GP1 of brachymemma;
During specific implementation, can will be positioned at one or more OFDM symbols of GP1 front portion and the TS0 that TS0 constitutes jointly overlength, then deduct the OFDM symbol of incorporating TS0 into as the GP1 of brachymemma by former GP1 duration among the GP1.
(2) in super covering far away or the descending situation to up serious interference:
One or more business time-slots (such as TS1, TS2 etc.) that first protection GP1 back, interval links to each other can be united the GP1 that consists of lengthening with GP1.
During specific implementation, then be to carry out addition by GP1 with the duration of the one or more conventional business time-slots that link to each other thereafter, as the duration of the GP1 of the lengthening of formation after the associating.
As shown in table 3, provide first and protected the relation of interval GP1 length and largest coverage distance.For the GP1 of brachymemma, suppose the duration 54.6875 μ s of an OFDM symbol, wherein 4.6875 μ s are the duration of short CP.
The relation of table 3 GP1 length and largest coverage distance
| GP1 duration (μ s) | Largest coverage distance (km) | Remarks |
| 68.125 | 10.21875 | Two OFDM symbols of the basic GP1-of brachymemma GP1= |
| 122.8125 | 18.421875 | The basic GP1-1 of a brachymemma GP1=OFDM symbol |
| 177.5 | 26.625 | Basic GP1 |
| 615 | 92.25 | Lengthen the basic GP1+TS1 of GP1= |
| 1052.5 | 157.875 | Lengthen the basic GP1+TS1+TS2 of GP1= |
| 1490 | 223.5 | Lengthen the basic GP1+TS1+TS2+TS3 of GP1= |
For the system of multicarrier, configurable different GP1 duration and uplink/downlink transfer point UDSP position between different carrier.Because UDSP is disposed in second protection interval GP2, then in fact the position of UDSP in frame structure be exactly the position of GP2.
The position configuration of UDSP need be considered the distribution of uplink and downlink service traffics and decide.Wherein, two kinds of special circumstances comprise:
(1) after UDSP is configured in GP1, be that GP2 closelys follow after the position of GP1, (TS0～TS10) is descending time slot to all like this business time-slots, be suitable for the situation that downlink business occupies, such as multimedia broadcasting and multicast service (MBMS), high speed downlink packet access (HSDPA) etc.;
(2) UDSP is configured in after last business time-slot TS10, be that GP2 closelys follow after the position of TS10, so except TS0, (TS1～TS10) is ascending time slot to all the other business time-slots, be suitable for the situation that uplink service occupies, such as high speed downlink packet access (HSUPA) etc.
The random access procedure of portable terminal is configured in any uplink service time slot, consider descending to up interference problem, random access procedure preferentially is configured in interior last the uplink service time slot of subframe, perhaps is configured in as far as possible in the ascending time slot away from DUSP.
In sum, the present invention has provided a kind of radio transmitting method and physical layer frame structure of TDD OFDM wireless communication system, has improved the utilance of system resource, can also suppress the interference of uplink and downlink signal simultaneously.
The present invention is applicable to ofdm communication system, be particularly useful for TDD OFDM mobile communication system, any technical staff with knowledge background such as signal processing, communications, the physical layer frame structure that is equal to of design according to the present invention, it all should be included in thought of the present invention and the scope.
Described herein is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Therefore, all any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improve and upgrade etc., all should be included within protection scope of the present invention.
Claims (7)
1. the radio transmitting method of a TDD OFDM system is used for base station or intermediate node and realizes wireless traffic is received and sends, it is characterized in that, in each subframe of the physical layer frame of carrying wireless traffic:
(1) transceiver sends downlink information in first conventional business time-slot;
(2) then, after pause first is protected the duration at interval and finished the downstream-to-upstream conversion, in N conventional business time-slot as ascending time slot, receive uplink business data;
(3) then, at the duration at the second protection interval of pausing and finish be up to down conversion after, in M conventional business time-slot as descending time slot, send downlink service data;
Wherein, the value of N, M is 0 or positive integer, and N and M sum add 1 and equal the total number of conventional business time-slot that disposes in the subframe;
Wherein, the duration at the first protection interval described in the step (2) is that situation according to signal coverage distance in the wireless communication system is configured:
For small distance covering and descending in the insignificant situation of up interference, this the first protection interval is divided into forward and backward two parts, its front portion and described first conventional business time-slot constitute jointly first conventional business time-slot of overlength, are used at the common transmission of step (1) downlink business; And this remaining rear portion, the first protection interval consists of the first protection interval of brachymemma, and conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot of overlength; Perhaps,
In super covering far away or descending situation to up serious interference; this first protection interval and the one or more continuous conventional business time-slots that link to each other are thereafter united consist of the first protection interval that lengthens, for the conversion that behind first conventional business time-slot, pauses with downstream-to-upstream.
2. radio transmitting method as described in claim 1 is characterized in that the Cyclic Prefix of OFDM symbol in the conventional business time-slot of each of described physical layer frame is configured to according to different application scenarioss:
Short Cyclic Prefix, its duration scope is 4 μ s≤T
S≤ 6 μ s are used for hour prolonging expansion; Or,
Long loop prefix, its duration scope are 15 μ s≤T
L≤ 25 μ s are used for or the long time delay expansion; Or
The overlength Cyclic Prefix, its duration scope is T
SL〉=30 μ s are used for the expansion of super large time delay.
3. radio transmitting method as claimed in claim 2 is characterized in that, for the situation of short Cyclic Prefix or long loop prefix, the number of the OFDM symbol in each conventional business time-slot is configured to even number.
4. radio transmitting method as claimed in claim 3 is characterized in that, for the situation of short Cyclic Prefix or long loop prefix, the number of the OFDM symbol in each conventional business time-slot is configured to the number of 2 power side.
5. such as each described radio transmitting method among the claim 1-4, it is characterized in that described the first protection interval is greater than described the second protection interval.
6. radio transmitting method as claimed in claim 1, it is characterized in that, described method adopts physical layer frame structure, is used for the wireless traffic of carrying TDD OFDM system base station or intermediate node transmitting-receiving, comprises again in each subframe of described physical layer frame:
First conventional business time-slot that is used for bearing downlink information of subframe section start;
N uplink conventional business time-slot that is used for the carrying uplink service;
M descending conventional business time-slot that is used for the bearing downlink business;
The first protection interval, between described first conventional business time-slot and N uplink conventional business time-slot, to descending time slot and ascending time slot in the enterprising between-line spacing of time domain and finish the conversion of downstream-to-upstream;
The second protection interval, between the individual descending conventional business time-slot of described N uplink conventional business time-slot and M, to ascending time slot and descending time slot in the enterprising between-line spacing of time domain and finish and be up to descending conversion;
Wherein, the value of N, M is 0 or positive integer, and N and M sum add 1 again and equal the total number of conventional business time-slot that disposes in the subframe.
7. radio transmitting method as claimed in claim 6, it is characterized in that, described physical layer frame structure is at the random access procedure of portable terminal, random access procedure is configured in the subframe in last uplink service time slot, perhaps is configured in the uplink service time slot away from descending/up transfer point.
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| US8649281B2 (en) * | 2009-04-27 | 2014-02-11 | Samsung Electronics Co., Ltd. | Control design for backhaul relay to support multiple HARQ processes |
| WO2011059518A1 (en) * | 2009-11-13 | 2011-05-19 | Qualcomm Incorporated | Method and apparatus for uplink and downlink rf switching |
| CN102035785B (en) * | 2010-11-12 | 2013-04-03 | 清华大学 | Frequency-division duplexing transmission method for wideband wireless communication system |
| CN102035786B (en) * | 2010-11-12 | 2013-05-01 | 清华大学 | Time division duplex transmission method for broadband wireless communication system |
| US10841946B2 (en) * | 2015-08-31 | 2020-11-17 | Ntt Docomo, Inc. | User terminal, radio base station, and radio communication method |
| CN109286938A (en) * | 2017-07-19 | 2019-01-29 | 中兴通讯股份有限公司 | A kind of method, base station and terminal for transmitting signal |
| CN112565157A (en) * | 2019-09-25 | 2021-03-26 | 普天信息技术有限公司 | Data transmission method and device for relay area |
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| WO1999044384A1 (en) * | 1998-02-27 | 1999-09-02 | Siemens Aktiengesellschaft | Relaying in a telecommunications system based on code and time-division multiplex |
| CN1466286A (en) * | 2002-06-06 | 2004-01-07 | 华为技术有限公司 | Transmission method for high speed grouping busihess data based on TDD |
| 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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Patent Citations (3)
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| WO1999044384A1 (en) * | 1998-02-27 | 1999-09-02 | Siemens Aktiengesellschaft | Relaying in a telecommunications system based on code and time-division multiplex |
| CN1466286A (en) * | 2002-06-06 | 2004-01-07 | 华为技术有限公司 | Transmission method for high speed grouping busihess data based on TDD |
| 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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