CN101374012A - 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 the 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 promptly each communication system all includes unique separately physical layer frame structure.In the physical layer design process, need take into full account and weigh communication system resource utilization (as spectrum efficiency etc.), multiple access (access) mode, physical layer key technology, realize that feasibility etc. is all multifactor.
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 inserts).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 (GP) and uplink pilot time slot (UpPTS) at interval.
GP is except being used to come downwards to the up transfer point at interval in protection, and the length of its 96 chips (i.e. 75 μ s) is one of key factor of determining cell coverage area, can weaken the interference of downstream signal to upward signal to a certain extent simultaneously.Although GP length can satisfy most application scenarios, yet can find according to the field testing conclusion, in specific identical networking environment, as environment such as spaciousness, basin, the minizone is similar to the line-of-sight propagation environment, so adjacent sub-district, more the downstream signal through or repeatedly reflection of far end cell may be still forms than serious disturbance the upward signal of this sub-district, influences the entire system performance.
In the conventional time slot of TD-SCDMA (LCR TDD) system, except that data block and intermediate code, also there is the fixedly slot time of one 16 chip (i.e. 12.5 μ s), in order to suppress the multidiameter delay expansion, realize the configuration of up/down conversion point simultaneously.
At application number is that CN200510053780, publication number are CN1832378, the day for announcing to be in the Chinese patent " the wide-band TDD system uses high-efficient high performance frame structure to carry out the method for wireless transmission " on September 13rd, 2006, has 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 the back 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 system, 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,,, therefore need not reserved category like the slot time in the conventional time slot of TD-SCDMA system physical layer frame structure because all there is Cyclic Prefix (CP) in each symbol for ofdm communication system.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 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 usage factor 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 duration at interval and finished the downstream-to-upstream conversion, in N conventional business time-slot, receive uplink business data as ascending time slot;
(3) then, pause second protection at interval duration and finish be up to down conversion after, in M conventional business time-slot, send downlink service data as descending time slot;
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 power.
Described first protection at interval greater than described second protection at interval.The duration at interval of first protection 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 under the insignificant situation of up interference, this first protection is divided into forward and backward two parts at interval, 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 first protection that this at interval remaining rear portion of first protection constitutes brachymemma at interval, and conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot of overlength; Perhaps,
Under super covering far away or descending situation to up serious interference; with this first protection at interval and the one or more continuous conventional business time-slots that link to each other thereafter unite the first protection interval that constitutes lengthening, conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot.
The present invention also provides a kind of physical layer frame structure that is used for described radio transmitting method, is used for carrying the wireless traffic of 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 to carry uplink service;
M descending conventional business time-slot that is used for the bearing downlink business;
First protection at 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;
Second protection at interval, between described N uplink conventional business time-slot and the individual descending conventional business time-slot of 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 based on the duration of business 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 power.
Described first protection at interval greater than described second protection at interval.Described first protection is that the situation according to signal coverage distance in the wireless communication system is configured at interval:
For small distance covering and descending under the insignificant situation of up interference, this first protection is divided into forward and backward two parts at interval, its front portion and described first conventional business time-slot constitute jointly first conventional business time-slot of overlength, are used for transmitting jointly downlink business; And this at interval remaining rear portion of first protection constitutes the first protection interval of brachymemma, configurating downlink/up transfer point in first protection at interval of described brachymemma;
Perhaps; under super covering far away or descending situation to up serious interference; the first protection interval that constitutes lengthening, configurating downlink/up transfer point in first protection at interval of described lengthening are united with the one or more continuous conventional business time-slots that link to each other thereafter in this first protection interval.
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 is provided is provided; realized wireless transmission; can be when transmission according to the concrete condition of up-downgoing business; adjust the time interval resource of distributing to up-downgoing flexibly, improved usage factor of system resource, while because first, second protection configuration at interval suppresses the interference of uplink and downlink signal.
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 some conventional business time-slots and two protections in each subframe again at interval, i.e. the first protection interval and second protection is at interval.When carrying out wireless transmission, utilize a conventional time slot to send the downlink business control information earlier, pause a period of time afterwards, utilize one or more conventional business time-slots to receive uplink service again, pause a period of time more afterwards, utilize one or more conventional business time-slots to send downlink business again.
Described physical layer frame structure and radio transmitting method are applicable to the base station or are used to transmit or the intermediate node of 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 duration at interval and finished the downstream-to-upstream conversion, in N conventional business time-slot, receive uplink business data as ascending time slot;
(3) then, pause second protection at interval duration and finish be up to down conversion after, in M conventional business time-slot, send downlink service data as descending time slot;
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 power.
Described first protection at interval greater than described second protection at interval.Described first protection duration at interval is that the situation according to signal coverage distance in the wireless communication system is configured:
For small distance covering and descending under the insignificant situation of up interference, this first protection is divided into forward and backward two parts at interval, 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 first protection that this at interval remaining rear portion of first protection constitutes brachymemma at interval, and conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot of overlength; Perhaps,
Under super covering far away or descending situation to up serious interference; with this first protection at interval and the one or more continuous conventional business time-slots that link to each other thereafter unite the first protection interval that constitutes lengthening, conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot.
(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 the duration of one or more OFDM symbols respectively.Further, the sequential of described synchronous channel SCH is positioned at before the broadcast channel BCH.
(2) then, after first protection duration at interval that pauses, in one or more conventional business time-slot, receive uplink business data as ascending time slot;
Wherein, by disposing a descending/up transfer point DUSP realize pausing first protection duration at interval.This descending/up transfer point DUSP is in first protection at interval, and the conversion of downstream-to-upstream is carried out in indication, finishes conversion and get final product in first protection at interval, and just first protection duration at interval comprises transfer point.Usually, first protection duration at interval is a fixing duration, promptly is first a basic protection interval.First protection duration at 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 under the insignificant situation of up interference, this first protection is divided into forward and backward two parts at interval, 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 at interval remaining rear portion of first protection constitutes the first protection interval of brachymemma, is used for pausing behind first conventional business time-slot of overlength; Perhaps,
Under super covering far away or descending situation to up serious interference; the first protection interval that constitutes lengthening is united with the one or more continuous conventional business time-slots that link to each other thereafter in this first protection interval, be used for behind first conventional business time-slot, pausing.
(3) then, after second protection duration at interval that pauses, in one or more conventional business time-slot, send downlink service data as descending time slot.
Wherein, according to the up/down conversion point UDSP of the configuration duration at the second protection interval of realizing pausing.This up/down conversion point UDSP is in second protection at interval, and indication is up to descending conversion, finishes conversion and get final product in second protection at interval, and just second protection duration at 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 power, to satisfy the demand of spread spectrum.
Described first protection at interval greater than described second protection at interval.First protection is/up transfer point DUSP descending except comprising at interval, realizes outside the conversion to downstream-to-upstream, also realizes suppressing descending function to uplink interference, thereby first protection is set usually at interval greater than described second protection at interval.
Insert under (HSDPA) situation in multimedia broadcasting and multicast service (MBMS), high speed downlink packet, in the step (2), after first protection duration at interval that pauses, directly forward step (3) to; In the step (3), after continuing pause second protection duration at interval, send downlink service data in the conventional business time-slot of all conventional business time-slot except that 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.
Insert under (HSUPA) situation in high speed downlink packet, in the step (2), after first protection duration at interval that pauses, receive uplink business data in the conventional business time-slot of all conventional business time-slot except that first; In the step (3), second protection duration at interval only pauses.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 on base station or intermediate node, realize the wireless traffic transmission.Correspondingly, realize described radio transmitting method, also need a kind of physical layer frame structure that adapts.
A kind of physical layer frame structure that is used for described radio transmitting method is used for carrying the wireless traffic of 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 to carry uplink service;
M descending conventional business time-slot that is used for the bearing downlink business;
First protection at 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;
Second protection at interval, between described N uplink conventional business time-slot and the individual descending conventional business time-slot of 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 the general physical layer frame structure schematic diagram of TDD OFDM wireless communication system in this embodiment.
Wherein, the radio frames of each 10ms is divided into two isostructural 5ms subframes, and each subframe comprises N conventional business time-slot (TS) and two protection intervals (GP1 and GP2) again.
Situation with the 20kHz subcarrier spacing is an example, and each subframe can be divided into N=11 conventional business time-slot that waits duration again, 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 the duration of one or more OFDM symbols respectively, the sequential of SCH can be positioned at before the BCH.
First protection (GP1) at interval protects interval (GP2) to be configured in the back that is right after GP1 or any one the conventional business time-slot except that TS0 according to the uplink and downlink service traffics for second between TS0 and TS1.It is further, descending/up transfer point that (Downlink Uplink SwitchingPoint DUSP) is configured in the GP1, and (Uplink Downlink SwitchingPoint UDSP) is configured in the GP2 up/down conversion point.
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, based on the duration of business 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.Wherein, the duration scope of 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 C P duration parameters and application scenarios.
Table 2 typical C P duration
| 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 power, 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, described first protection (GP1) at interval also can be done following variation:
(1) for small distance covering and descending under the insignificant situation of up interference:
First protection GP1 at interval can be divided into forward and backward two parts, and the front portion of GP1 can constitute jointly the TS0 of overlength with first conventional business time-slot TS0, is used for common transmitting downlink data; And the remainder (being the rear portion) of first protection interval GP1 constitutes 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 GP1 among the GP1 as brachymemma by former GP1 duration.
(2) under super covering far away or the descending situation to up serious interference:
First protection continuous one or more business time-slots (as TS1, TS2 etc.) in GP1 back at interval can be united the GP1 that constitutes lengthening with GP1.
During specific implementation, then be to carry out addition 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 by GP1.
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 | The basic GP1+TS1 of lengthening GP1= |
| 1052.5 | 157.875 | The basic GP1+TS1+TS2 of lengthening GP1= |
| 1490 | 223.5 | The basic GP1+TS1+TS2+TS3 of lengthening GP1= |
For the system of multicarrier, configurable different GP1 duration and up/down conversion 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) be descending time slot is suitable for the situation that downlink business occupies to all like this business time-slots, inserts (HSDPA) etc. as multimedia broadcasting and multicast service (MBMS), high speed downlink packet;
(2) UDSP is configured in after last business time-slot TS10, be that GP2 closelys follow after the position of TS10, so except that TS0, (TS1～TS10) is ascending time slot to all the other business time-slots, be suitable for the situation that uplink service occupies, insert (HSUPA) etc. as high speed downlink packet.
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 usage factor 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 changes and variation.Therefore, all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improve and upgrade or the like, all should be included within protection scope of the present invention.
Claims (13)
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 duration at interval and finished the downstream-to-upstream conversion, in N conventional business time-slot, receive uplink business data as ascending time slot;
(3) then, pause second protection at interval duration and finish be up to down conversion after, in M conventional business time-slot, send downlink service data as descending time slot;
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.
2. the radio transmitting method 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 power.
5. as each described radio transmitting method among the claim 1-4, it is characterized in that described first protection at interval greater than described second protection at interval.
6. radio transmitting method as claimed in claim 5 is characterized in that, the duration at interval of first protection 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 under the insignificant situation of up interference, this first protection is divided into forward and backward two parts at interval, 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 first protection that this at interval remaining rear portion of first protection constitutes brachymemma at interval, and conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot of overlength; Perhaps,
Under super covering far away or descending situation to up serious interference; with this first protection at interval and the one or more continuous conventional business time-slots that link to each other thereafter unite the first protection interval that constitutes lengthening, conversion with downstream-to-upstream is used for pausing behind first conventional business time-slot.
7. a physical layer frame structure that is used for the described radio transmitting method of claim 1 is used for carrying the wireless traffic of 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 to carry uplink service;
M descending conventional business time-slot that is used for the bearing downlink business;
First protection at 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;
Second protection at interval, between described N uplink conventional business time-slot and the individual descending conventional business time-slot of 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.
8. physical layer frame structure as claimed in claim 7 is characterized in that, the Cyclic Prefix of OFDM symbol in the conventional business time-slot of each of described physical layer frame based on the duration of business 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.
9. physical layer frame structure as claimed in claim 8 is characterized in that, 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.
10. physical layer frame structure as claimed in claim 9 is characterized in that, 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 power.
11., it is characterized in that described first protection at interval greater than described second protection at interval as each described physical layer frame structure among the claim 7-10.
12. physical layer frame structure as claimed in claim 11 is characterized in that, described first protection is that the situation according to signal coverage distance in the wireless communication system is configured at interval:
For small distance covering and descending under the insignificant situation of up interference, this first protection is divided into forward and backward two parts at interval, its front portion and described first conventional business time-slot constitute jointly first conventional business time-slot of overlength, are used for transmitting jointly downlink business; And this at interval remaining rear portion of first protection constitutes the first protection interval of brachymemma, configurating downlink/up transfer point in first protection at interval of described brachymemma;
Perhaps; under super covering far away or descending situation to up serious interference; the first protection interval that constitutes lengthening, configurating downlink/up transfer point in first protection at interval of described lengthening are united with the one or more continuous conventional business time-slots that link to each other thereafter in this first protection interval.
13. physical layer frame structure as claimed in claim 12, 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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| CN102035786A (en) * | 2010-11-12 | 2011-04-27 | 清华大学 | Time division duplex transmission method for broadband wireless communication system |
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