CN101374011A - Method for implementing critical frequency coexist between two different communication systems and physical layer frame structure - Google Patents
Method for implementing critical frequency coexist between two different communication systems 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. During conducing wireless transmission, each sub-frame in the physical layer 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. Considering the adjacent frequency coexistence problem of the TDD OFDM system and the TD-SCDMA system, the sub-frame conducts mutual switching between the uplink and the downlink during pausing periods, so as to ensure alignment of the same type of uplink and downlink switching points in the two communication systems, including the alignment of downlink/uplink switching points and the alignment of uplink/downlink switching points. The inventive method conducts wireless service transmission by using the alignment of the uplink and downlink switching points, thereby eliminating intersystem interference and improving the utilization ratio of system resources.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to method and the physical layer frame structure of realizing critical frequency coexist between TD SDMA (TD-SCDMA) communication system of a kind of time division duplex (TDD) OFDM (OFDM, Orthogonal Frequency Division Multiplexing) communication system and low spreading rate (LCR).
Background technology
Physical layer frame structure is the basis of any communication system, and promptly each communication system all comprises its unique physical layer frame structure.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 DivisionMultiple Access, TD SDMA inserts).For adopting TDD (Time DivisionDuplexing; time division duplex) TD SDMA (the LCR TDD of the low spreading rate (LCR) of duplex mode; TD-SCDMA) system; the core characteristics of its physical layer frame are: 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.
The protection of one of described special time slot is GP at interval, and except being used to come downwards to the up transfer point, the length of its 96 chips (i.e. 75 μ s) is one of key factor of determining cell coverage area; Protection simultaneously GP at interval can weaken the interference of downstream signal to upward signal to a certain extent.Although GP length can satisfy most application scenarios, yet can find according to the field testing conclusion, in specific identical networking environment, as than environment such as open space or basins, the minizone is similar to line-of-sight propagation, 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, and then can influence the entire system performance.
At TD-SCDMA (LCR TDD, low spreading rate time division duplex) in the conventional time slot of 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.Yet,, therefore do not need reserved time slot at interval because all there is Cyclic Prefix (CP) in each symbol for ofdm communication system.
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.The TD-SCDMA system is in the extensive networking stage at present, therefore must be in the problem of considering the critical frequency coexist between TDD ofdm system and the TD-SCDMA system aspect the physical layer frame structure, with the phase mutual interference between the elimination system.
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, provided a kind of frame structure based on wideband time division duplexing TDD system, this frame structure with one fixedly the sub-frame division of duration be several basic time slots and several special time slots.The described method of this patent has been pointed out a kind of developing direction of TDD system back three generations (B3G), yet described frame structure can be thought a kind of improvement of TD-SCDMA system frame structure, basic structure between the two is similar, if be applied in the TDD ofdm system, can realize critical frequency coexist by the mode of time slot alignment, yet this method causes resource utilization ratio to reduce with TD-SCDMA.
Thereby, in the TDD ofdm system, how to realize and the TD-SCDMA system between critical frequency coexist, the phase mutual interference between the elimination system simultaneously can improve resource utilization ratio again, becoming needs to solve the ground technical problem.
Summary of the invention
Technical problem to be solved by this invention is, the radio transmitting method and the physical layer frame structure of critical frequency coexist between a kind of TDD ofdm system and the TD-SCDMA system are provided, in order to realize that critical frequency coexist is the wireless traffic transmission between two kinds of systems, the phase mutual interference between the elimination system improves resource utilization ratio simultaneously.
The invention provides a kind of radio transmitting method of realizing critical frequency coexist between two kinds of different communication systems, be used for transmitting under the critical frequency coexist between TDD OFDM system and the TD-SCDMA system wireless traffic:
When base station or intermediate node transmission, in the subframe of the physical layer frame structure of TDD OFDM system, in N conventional business time-slot, send downlink data earlier, behind pause first protection duration at interval, receive upstream data at M conventional business time-slot, pause again behind second protection duration at interval, send downlink data at K conventional business time-slot again;
Described TDD OFDM system is according to TD-SCDMA system protection setting at interval, the time slot of its physical frame of corresponding configuration and protection are at interval, make the protection of TD-SCDMA system be included on time domain at interval in the first protection interlude section, the up/down conversion point of TD-SCDMA system is included in the second protection interlude section;
Wherein, the value of K, N, M is 0 or positive integer, and K, N, M sum equal the total number of conventional business time-slot that disposes in the subframe.
Satisfy TDD OFDM system and TD-SCDMA system critical frequency coexist and descending to the insignificant prerequisite of up interference under:
The individual conventional business time-slot of the front portion at the described first protection interval and described N constitutes jointly the downlink business time slot of overlength, common transmitting downlink data;
Described first protection remainder at interval constitutes the first protection interval of brachymemma, first protection of this brachymemma at interval at interval more than or equal to the protection in the subframe in the physical layer frame structure of TD-SCDMA system, and in first protection of this brachymemma is included in the protection in the subframe in the physical layer frame structure of TD-SCDMA system on time domain at interval at interval;
Comprise descending/up transfer point in first protection at interval of described brachymemma.
Comprise the descending/up transfer point that is used to realize the professional conversion of downstream-to-upstream in described first protection at interval; Comprise the up/down conversion point that is used to realize being up to the downlink business conversion in described second protection at interval.Described second protection comprises the up/down conversion point of TD-SCDMA system at interval by the idle period that adds adjacent time-slots.Realizing during second protection is at interval with the TD-SCDMA system physical layer frame that the up/down conversion point of subframe is included in when interior; described second protection is united with one or more continuous free orthogonal frequency division multiplexing symbols or with an idle time slot at interval, in being included in up/down conversion point subframe in the TD-SCDMA system physical layer frame.When described second protection is united with adjacent idle period at interval, be configuration free orthogonal frequency division multiplexing symbol, still dispose idle time slot, depend on that TDD OFDM system is to dispatch or dispatch by time slot by symbol.
The present invention also provides a kind of physical layer frame structure that is used for the TDD OFDM system of described radio transmitting method, carrying wireless traffic with the TD-SCDMA system critical frequency coexist time, in the subframe of the physical layer frame structure of TDD OFDM system, begin in time domain, to comprise successively from the starting point of subframe:
N conventional business time-slot that is used to send downlink data; First protection is used for descending ascending time slot is carried out the interval and finishes the professional conversion of downstream-to-upstream at interval; M conventional business time-slot that is used to receive upstream data; Second protection is used for the upstream and downstream time slot is carried out the interval and finish being up to the downlink business conversion at interval; K conventional business time-slot that is used to send downlink data;
Wherein, in the first protection interlude section, include the protection interval of TD-SCDMA system, in the second protection interlude section, include the up/down conversion point of TD-SCDMA system; The value of described N, M, K is 0 or positive integer, and N, M, K sum equal the total number of conventional business time-slot that disposes in the subframe.
Satisfy TDD OFDM system and TD-SCDMA system critical frequency coexist and descending to the insignificant prerequisite of up interference under:
Described first protection front portion and described N individual conventional business time-slot of N that conventional business time-slot constitutes jointly overlength at interval, common transmitting downlink data;
Described first protection remainder at interval constitutes the first protection interval of brachymemma, first protection of this brachymemma at interval at interval more than or equal to the protection in the subframe in the physical layer frame structure of TD-SCDMA system, and in first protection of this brachymemma is included in the protection in the subframe in the physical layer frame structure of TD-SCDMA system on time domain at interval at interval;
Comprise descending/up transfer point in first protection at interval of described brachymemma.
Comprise in first protection at interval and be used to carry out descending/up transfer point that downstream-to-upstream switches; Comprise the up/down conversion point that is used to be up to descending switching in second protection at interval.
Realizing during second protection is at interval with the TD-SCDMA system physical layer frame that the up/down conversion point of subframe is included in when interior; be meant that described second protects the interval to unite with one or more continuous free orthogonal frequency division multiplexing symbols or with an idle time slot, in being included in up/down conversion point with subframe in the TD-SCDMA system physical layer frame.When described second protection is united with adjacent idle period at interval, be configuration free orthogonal frequency division multiplexing symbol, still dispose idle time slot, depend on that TDD OFDM system is to dispatch or dispatch by time slot by symbol.
Radio transmitting method provided by the invention and corresponding physical layer frame structure, realizing between TDD ofdm system and the TD-SCDMA system under the critical frequency coexist situation, adopt the mode of uplink and downlink transfer point alignment, carry out the wireless traffic transmission, eliminate the phase mutual interference between system, improved usage factor of system resource simultaneously.
Description of drawings
Fig. 1 is the TDD ofdm communication system of one embodiment of the invention uplink and downlink symmetry division and the structural representation of TD-SCDMA communication system critical frequency coexist.
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.Comprise some conventional business time-slots and two protections in each subframe of physical layer frame again at interval, i.e. the first protection interval and second protection 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.Carry out mutual switching between up, descending at pause, consider the critical frequency coexist problem of TDD ofdm system and TD-SCDMA communication system, the uplink and downlink transfer point alignment of same type in two communication systems be should guarantee, descending/up transfer point alignment and up/down conversion point alignment comprised.
The invention provides a kind of radio transmitting method of realizing critical frequency coexist between two kinds of different communication systems, be used for transmitting under the critical frequency coexist between TDD OFDM system and the TD-SCDMA system wireless traffic:
When base station or intermediate node transmission, in the subframe of the physical layer frame structure of TDD OFDM system, in N conventional business time-slot, send downlink data earlier, behind pause first protection duration at interval, receive upstream data at M conventional business time-slot, pause again behind second protection duration at interval, send downlink data at K conventional business time-slot again;
Described TDD OFDM system is according to TD-SCDMA system protection setting at interval, the time slot of its physical frame of corresponding configuration and protection are at interval, make the protection of TD-SCDMA system be included on time domain at interval in the first protection interlude section, the up/down conversion point of TD-SCDMA system is included in the second protection interlude section;
Wherein, the value of K, N, M is 0 or positive integer, and K, N, M sum equal the total number of conventional business time-slot that disposes in the subframe.
Satisfy TDD OFDM system and TD-SCDMA system critical frequency coexist and descending to the insignificant prerequisite of up interference under:
The individual conventional business time-slot of the front portion at the described first protection interval and described N constitutes jointly the downlink business time slot of overlength, common transmitting downlink data;
Described first protection remainder at interval constitutes the first protection interval of brachymemma, first protection of this brachymemma at interval at interval more than or equal to the protection in the subframe in the physical layer frame structure of TD-SCDMA system, and in first protection of this brachymemma is included in the protection in the subframe in the physical layer frame structure of TD-SCDMA system on time domain at interval at interval;
Comprise descending/up transfer point in first protection at interval of described brachymemma.
Comprise the descending/up transfer point that is used to realize the professional conversion of downstream-to-upstream in described first protection at interval; Comprise the up/down conversion point that is used to realize being up to the downlink business conversion in described second protection at interval.Described second protection comprises the up/down conversion point of TD-SCDMA system at interval by the idle period that adds adjacent time-slots.Realizing during second protection is at interval with the TD-SCDMA system physical layer frame that the up/down conversion point of subframe is included in when interior; described second protection is united with one or more continuous free orthogonal frequency division multiplexing symbols or with an idle time slot at interval, in being included in up/down conversion point subframe in the TD-SCDMA system physical layer frame.When described second protection is united with adjacent idle period at interval, be configuration free orthogonal frequency division multiplexing symbol, still dispose idle time slot, depend on that TDD OFDM system is to dispatch or dispatch by time slot by symbol.
Based on above-mentioned analysis, radio transmitting method between TDD OFDM system and the TD-SCDMA system under the critical frequency coexist, during the transmission of base station or intermediate node in the subframe of the physical layer frame structure of TDD OFDM system:
(1) transceiver of base station or intermediate node 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) subsequently, the duration at the first protection interval of pausing, when pausing, the business of finishing downstream-to-upstream is switched, and first protection comprises the protection interval of subframe in the TD-SCDMA system physical layer frame at interval on sequential;
The business of downstream-to-upstream is switched, and is to realize by the descending/up transfer point that comprises in first protection at interval.First protection zero-time at interval will prior to or equal the protection zero-time at interval of subframe in the TD-SCDMA system physical layer frame, the first protection concluding time at interval will equal or be later than the protection concluding time at interval of subframe in the TD-SCDMA system physical layer frame.
Satisfy TDD OFDM system and TD-SCDMA system critical frequency coexist and descending to the insignificant prerequisite of up interference under:
First conventional business time-slot that the front portion at the first protection interval and described first conventional business time-slot TS0 constitute jointly overlength, common transmitting downlink data;
First protection remainder at interval constitutes the first protection interval of brachymemma, first protection of this brachymemma at interval at interval more than or equal to the protection in the subframe in the physical layer frame structure of TD-SCDMA system, and in first protection of this brachymemma is included in the protection in the subframe in the physical layer frame structure of TD-SCDMA system on sequential at interval at interval;
Comprise descending/up transfer point in first protection at interval of brachymemma.
(3) in one or more conventional business time-slot, receive uplink business data as ascending time slot;
(4) subsequently, second protection duration at interval that pauses when pausing, finishes being up to descending business switching, and second protection comprises the up/down conversion point of subframe in the TD-SCDMA system physical layer frame at interval on sequential;
Being up to descending business and switching, is to realize by the up/down conversion point that comprises in second protection at interval.When described second protection pauses at interval; second protection zero-time at interval will prior to or equal the zero-time of the up/down conversion point of subframe in the TD-SCDMA system physical layer frame, the concluding time at the second protection interval will equal or be later than the concluding time of the up/down conversion point of subframe in the TD-SCDMA system physical layer frame.Further, the up/down conversion point of subframe overlaps on sequential in the up/down conversion point in second protection at interval and the TD-SCDMA system physical layer frame.
Realizing during second protection is at interval with the TD-SCDMA system physical layer frame that the up/down conversion point of subframe is included in when interior; described second protection is united with one or more continuous free orthogonal frequency division multiplexing symbols or with an idle time slot at interval; second protection that has obtained prolonging on the sequential at interval, in being included in up/down conversion point with subframe in the TD-SCDMA system physical layer frame.Can before or after original second protection at interval, unite with OFDM symbol or idle time slot.Second protection is overtime at interval, disposes the free orthogonal frequency division multiplexing symbol or still disposes idle time slot, depends on that TDD OFDM system is to dispatch or dispatch by time slot by symbol.
(5) in one or more conventional business time-slot, send downlink service data as descending time slot.
Adopt above-mentioned radio transmitting method, can under the critical frequency coexist situation, realize the wireless traffic transmission on base station or the intermediate node.Correspondingly, realize described radio transmitting method, also need a kind of physical layer frame structure that adapts.
In the subframe of the physical layer frame structure of TDD OFDM system, comprising:
One or more conventional business time-slot TS are used to carry the upstream or downstream business;
First protection at interval, be used for the descending time slot of bearing downlink business is carried out interval and switching in time with the ascending time slot that carries uplink service, this first protection comprises the protection interval of subframe in the TD-SCDMA system physical layer frame at interval on sequential;
Second protection at interval, be used for the ascending time slot of carrying uplink service and the descending time slot of bearing downlink business are carried out interval and switching in time, this second protection comprises the up/down conversion point of subframe in the TD-SCDMA system physical layer frame at interval on sequential;
Wherein, first conventional business time-slot TS0 is configured in the section start of each subframe; described first protection is at interval immediately following after described first conventional business time-slot TS0, and the described second protection arranged spaced is to be right after after first protection at interval or the back of any one the conventional business time-slot except that first conventional business time-slot TS0.
When being illustrated in figure 1 as TDD ofdm communication system that one embodiment of the invention uplink and downlink symmetries divides and TD-SCDMA communication system critical frequency coexist, two kinds of systems are the contrast schematic diagram of physical layer frame structure separately.
Each 5ms subframe of TDD OFDM wireless communication system comprises N conventional business time-slot (TS) and two protection intervals (GP1 and GP2).With the 20kHz subcarrier spacing is example, and each sub-frame division is that (TS0～TS10), TS0 is configured to descending time slot to N=11 conventional business time-slot that waits duration.First protection (GP1) at interval protects interval (GP2) to be configured in the back that is right after GP1 or any one business time-slot except that TS0 according to the uplink and downlink service traffics for second between TS0 and TS1.
Descending/up transfer point (DUSP) is configured in the GP1, and up/down conversion point (UDSP) is configured in the GP2.
In order to realize the wireless transmission under the critical frequency coexist, need the uplink and downlink transfer point alignment of the physical layer frame structure of two kinds of communication systems of assurance, comprise descending/up transfer point alignment and up/down conversion point alignment.
In GP1 should be included in the GP of TD-SCDMA aspect sequential, the duration of GP1 was not less than 75 μ s; First protection at interval GP1 zero-time will prior to or equal the protection zero-time at interval of subframe in the TD-SCDMA system physical layer frame, the first protection concluding time at interval will equal or be later than the protection concluding time at interval of subframe in the TD-SCDMA system physical layer frame.
GP2 should be configured in the up/down conversion point sequential proximal most position with TD-SCDMA, and possible configuration one or more continuous idle OFDM symbol or idle time slots, in aspect sequential up/down conversion point of TD-SCDMA being included in.
Second protection at interval GP2 zero-time will prior to or equal the zero-time of the up/down conversion point of subframe in the TD-SCDMA system physical layer frame, the concluding time at the second protection interval will equal or be later than the concluding time of the up/down conversion point of subframe in the TD-SCDMA system physical layer frame.
Consider the critical frequency coexist problem of TDD ofdm system and TD-SCDMA communication system, the duration of GP1 is not less than the duration of the GP of TD-SCDMA system, promptly is not less than 75 μ s.In order to guarantee the alignment of uplink and downlink transfer point, comprise descending/up transfer point alignment and up/down conversion point alignment, in GP1 should be included in the GP of TD-SCDMA aspect sequential.
GP2 should be configured in the up/down conversion point sequential proximal most position with TD-SCDMA, and possible configuration one or more continuous idle OFDM symbol or idle time slots, in aspect sequential up/down conversion point of TD-SCDMA being included in.During specific implementation be the configuration idle OFDM symbol or or the configuration idle time slot depend on that the TDD ofdm system is to dispatch or dispatch by time slot by symbol.
Satisfy TDD ofdm system and TD-SCDMA communication system critical frequency coexist and descending to the insignificant prerequisite of up interference under, the front portion of GP1 can constitute jointly the TS0 of overlength with TS0, common transmitting downlink data, further improve usage factor of system resource, the remainder of GP1 constitutes the GP1 of brachymemma.The duration of brachymemma GP1 is not less than 75 μ s, in the GP1 of brachymemma aspect sequential simultaneously should be included in the GP of TD-SCDMA.
In sum, the present invention has provided the implementation method of a kind of TDD ofdm system and TD-SCDMA system critical frequency coexist, adopts the mode of uplink and downlink transfer point alignment, and the phase mutual interference between the elimination system improves usage factor of system resource 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 TDDOFDM system of design and the implementation method of TD-SCDMA system critical frequency coexist 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 (11)
1. a radio transmitting method of realizing critical frequency coexist between two kinds of different communication systems is used for transmitting wireless traffic between TDD OFDM system and the TD-SCDMA system under the critical frequency coexist, it is characterized in that:
When base station or intermediate node transmission, in the subframe of the physical layer frame structure of TDD OFDM system, in N conventional business time-slot, send downlink data earlier, behind pause first protection duration at interval, receive upstream data at M conventional business time-slot, pause again behind second protection duration at interval, send downlink data at K conventional business time-slot again;
Described TDD OFDM system is according to TD-SCDMA system protection setting at interval, the time slot of its physical frame of corresponding configuration and protection are at interval, make the protection of TD-SCDMA system be included on time domain at interval in the first protection interlude section, the up/down conversion point of TD-SCDMA system is included in the second protection interlude section;
Wherein, the value of K, N, M is 0 or positive integer, and K, N, M sum equal the total number of conventional business time-slot that disposes in the subframe.
2. radio transmitting method as claimed in claim 1 is characterized in that, satisfy TDD OFDM system and TD-SCDMA system critical frequency coexist and descending to the insignificant prerequisite of up interference under:
The individual conventional business time-slot of the front portion at the described first protection interval and described N constitutes jointly the downlink business time slot of overlength, common transmitting downlink data;
Described first protection remainder at interval constitutes the first protection interval of brachymemma, first protection of this brachymemma at interval at interval more than or equal to the protection in the subframe in the physical layer frame structure of TD-SCDMA system, and in first protection of this brachymemma is included in the protection in the subframe in the physical layer frame structure of TD-SCDMA system on time domain at interval at interval;
Comprise descending/up transfer point in first protection at interval of described brachymemma.
3. radio transmitting method as claimed in claim 2 is characterized in that:
Comprise the descending/up transfer point that is used to realize the professional conversion of downstream-to-upstream in described first protection at interval; Comprise the up/down conversion point that is used to realize being up to the downlink business conversion in described second protection at interval.
4. radio transmitting method as claimed in claim 3 is characterized in that, described second protection comprises the up/down conversion point of TD-SCDMA system at interval by the idle period that adds adjacent time-slots.
5. radio transmitting method as claimed in claim 4; it is characterized in that; realizing during second protection is at interval with the TD-SCDMA system physical layer frame that the up/down conversion point of subframe is included in when interior; described second protection is united with one or more continuous free orthogonal frequency division multiplexing symbols or with an idle time slot at interval, in being included in up/down conversion point subframe in the TD-SCDMA system physical layer frame.
6. radio transmitting method as claimed in claim 5; it is characterized in that; when described second protection is united with adjacent idle period at interval; it is configuration free orthogonal frequency division multiplexing symbol; still dispose idle time slot, depend on that TDD OFDM system is to dispatch or dispatch by time slot by symbol.
7. physical layer frame structure that is used for the TDD OFDM system of the described radio transmitting method of claim 1, carrying wireless traffic with the TD-SCDMA system critical frequency coexist time, it is characterized in that, in the subframe of the physical layer frame structure of TDD OFDM system, begin in time domain, to comprise successively from the starting point of subframe:
N conventional business time-slot that is used to send downlink data; First protection is used for descending ascending time slot is carried out the interval and finishes the professional conversion of downstream-to-upstream at interval; M conventional business time-slot that is used to receive upstream data; Second protection is used for the upstream and downstream time slot is carried out the interval and finish being up to the downlink business conversion at interval; K conventional business time-slot that is used to send downlink data;
Wherein, in the first protection interlude section, include the protection interval of TD-SCDMA system, in the second protection interlude section, include the up/down conversion point of TD-SCDMA system; The value of described N, M, K is 0 or positive integer, and N, M, K sum 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:
Satisfy TDD OFDM system and TD-SCDMA system critical frequency coexist and descending to the insignificant prerequisite of up interference under:
Described first protection front portion and described N individual conventional business time-slot of N that conventional business time-slot constitutes jointly overlength at interval, common transmitting downlink data;
Described first protection remainder at interval constitutes the first protection interval of brachymemma, first protection of this brachymemma at interval at interval more than or equal to the protection in the subframe in the physical layer frame structure of TD-SCDMA system, and in first protection of this brachymemma is included in the protection in the subframe in the physical layer frame structure of TD-SCDMA system on time domain at interval at interval;
Comprise descending/up transfer point in first protection at interval of described brachymemma.
9. physical layer frame structure as claimed in claim 8 is characterized in that:
Comprise in first protection at interval and be used to carry out descending/up transfer point that downstream-to-upstream switches;
Comprise the up/down conversion point that is used to be up to descending switching in second protection at interval.
10. physical layer frame structure as claimed in claim 9; it is characterized in that; realizing during second protection is at interval with the TD-SCDMA system physical layer frame that the up/down conversion point of subframe is included in when interior; be meant that described second protects the interval to unite with one or more continuous free orthogonal frequency division multiplexing symbols or with an idle time slot, in being included in up/down conversion point with subframe in the TD-SCDMA system physical layer frame.
11. physical layer frame structure as claimed in claim 10; it is characterized in that; when described second protection is united with adjacent idle period at interval; it is configuration free orthogonal frequency division multiplexing symbol; still dispose idle time slot, depend on that TDD OFDM system is to dispatch or dispatch by time slot by symbol.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011038621A1 (en) * | 2009-09-30 | 2011-04-07 | 中兴通讯股份有限公司 | Method and equipment for transmitting downlink control information |
| CN102045843A (en) * | 2009-10-10 | 2011-05-04 | 中兴通讯股份有限公司 | Method and system for allocating and transmitting downlink subfames in second-class relay station |
| CN101841906B (en) * | 2009-03-19 | 2012-09-05 | 华为技术有限公司 | Method and base station for transmitting frames synchronously |
| CN107333270A (en) * | 2016-04-28 | 2017-11-07 | 华为技术有限公司 | A kind of cellular system and its control method, relevant device |
| CN107659528A (en) * | 2013-12-04 | 2018-02-02 | 瑞典爱立信有限公司 | Downlink subframe method for reducing and device in tdd systems |
| CN109792637A (en) * | 2016-08-05 | 2019-05-21 | 诺基亚技术有限公司 | Pass through the transmission of the user plane data of cutting forward pass interface |
| US10728924B2 (en) | 2013-12-04 | 2020-07-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Uplink subframe shortening in time-division duplex (TDD) systems |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1196367C (en) * | 1998-02-27 | 2005-04-06 | 西门子公司 | Relaying in a telecommunications system based on code and time-division multiplex |
| CN1274098C (en) * | 2002-06-06 | 2006-09-06 | 华为技术有限公司 | Transmission method for high speed grouping busihess data based on TDD |
| CN1909533B (en) * | 2005-08-05 | 2010-10-06 | 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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2007
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841906B (en) * | 2009-03-19 | 2012-09-05 | 华为技术有限公司 | Method and base station for transmitting frames synchronously |
| WO2011038621A1 (en) * | 2009-09-30 | 2011-04-07 | 中兴通讯股份有限公司 | Method and equipment for transmitting downlink control information |
| CN102035593A (en) * | 2009-09-30 | 2011-04-27 | 中兴通讯股份有限公司 | Class II relay station and sending method of descending control information thereof |
| CN102035593B (en) * | 2009-09-30 | 2014-10-22 | 中兴通讯股份有限公司 | Class II relay station and sending method of descending control information thereof |
| CN102045843A (en) * | 2009-10-10 | 2011-05-04 | 中兴通讯股份有限公司 | Method and system for allocating and transmitting downlink subfames in second-class relay station |
| CN107659528A (en) * | 2013-12-04 | 2018-02-02 | 瑞典爱立信有限公司 | Downlink subframe method for reducing and device in tdd systems |
| US10728924B2 (en) | 2013-12-04 | 2020-07-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Uplink subframe shortening in time-division duplex (TDD) systems |
| US10868659B2 (en) | 2013-12-04 | 2020-12-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Downlink subframe shortening in time-division duplex (TDD) systems |
| US11622370B2 (en) | 2013-12-04 | 2023-04-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Uplink subframe shortening in time-division duplex (TDD) systems |
| US11895059B2 (en) | 2013-12-04 | 2024-02-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Downlink subframe shortening in time-division duplex (TDD) systems |
| CN107333270A (en) * | 2016-04-28 | 2017-11-07 | 华为技术有限公司 | A kind of cellular system and its control method, relevant device |
| CN109792637A (en) * | 2016-08-05 | 2019-05-21 | 诺基亚技术有限公司 | Pass through the transmission of the user plane data of cutting forward pass interface |
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