CN1960211A - Method and application for reducing coexistent interference of time division duplexing system in different frame structure - Google Patents
Method and application for reducing coexistent interference of time division duplexing system in different frame structure Download PDFInfo
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Abstract
When co-existence of the time division-synchronization code division multi-address TD-SCDMA time-division duplex system with the common land wireless access UTRA TDD time division duplex system is needed, configuring the slot of UTRA TDD, which deploys neighborly and uses the neighbor frequency according to the slot configuration of UTRA TDD system in order to ensure the consistent between the up going and down going slots of two systems. Therefore, the invention reduces the mutual interfere between systems and raises the system function.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to method and application that a kind of tdd systems coexistence that reduces the different frame structure is disturbed.
Background technology
TDD (time division duplex) is a kind of duplex mode of communication system, is used for separating in mobile communication system receiving and transfer channel (or uplink downlink).Receiving and transmit in the mobile communication system of tdd mode is to be the different time-gap of carrier wave at same frequency channels.3-G (Generation Three mobile communication system) is except providing speech, and also requirement can provide data and multimedia service.Because usually the up-downgoing capacity is asymmetric for Internet (internet), file transfer and multimedia service, the therefore suitable TDD duplex mode that adopts.
The TDD system has following characteristics:
(1) do not need paired frequency, can use various frequency resources, be applicable to asymmetric up-downgoing message transmission rate, be specially adapted to the data service of IP type;
(2) uplink and downlink works is in same frequency, and the symmetry characteristic of radio wave propagation makes it new technologies such as smart antenna easy to use, reaches the purpose that improves performance, reduces cost;
(3) equipment cost is lower.
TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, also claiming the LCR TDD time division duplex of spreading rate (low)) system and UTRA TDD (universal terrestrial radio inserts time division duplex, also claims HCR TDD (time division duplex of high spreading rate)) system all be mainstream standard of the mobile communication system of present 3GPP (third generation partner program) appointment.These two kinds of different systems all adopt the TDD technology, can work in the TDD frequency range.
The something in common of TD-SCDMA and UTRA TDD has: (1) uses the TDD duplex mode; (2) use FDMA/TDMA/CDMA (frequency division multiple access/TDMA/CDMA) simultaneously; (3) use identical QPSK (Quadrature Phase Shift Keying) rf modulations demodulation techniques; (4) use the spread spectrum modulation technique of identical orthogonal variable spread spectrum coefficient; (5) use identical superframe and radio frames length; (6) use identical data multiplexing and tapping method; (7), use and the identical technology of 3GPP in chnnel coding with aspect interweaving; (8) CDMA TDD will use identical second, third layer signaling.
In these two kinds of TDD systems, all adopted CDMA technology.The principle of CDMA technology is based on spread spectrum, need to be about to certain signal bandwidth information data that has of transmission, modulate much larger than the high speed pseudo noise code of signal bandwidth with a bandwidth, the bandwidth of former data-signal is expanded, again through carrier modulation and send.Receiving terminal uses identical pseudo noise code, makes relevant treatment with the bandwidth signal that receives, and the narrow band signal that broadband signal is changed into the prime information data is despreading, to realize information communication.
The interference problem of the CDMA mobile communication system of tdd mode mainly comprises the interference between the uplink downlink, the interference between the different network operators and from the interference of output pulses.
Interference between the uplink downlink is divided into the interference between the interference between the uplink downlink and minizone uplink downlink in the sub-district.The former be because in a sub-district between the user be damaged synchronously or time of uplink downlink distributes uneven.For the latter, asymmetrical TDD time slot will influence the Radio Resource of adjacent cell and cause the uplink downlink of minizone to disturb, the base station that adjacent cell can be blocked in high-power in addition base station receives the terminal of this sub-district, and the high power-terminal that is in cell boarder also can be blocked the terminal that different time-gap distributes that has of adjacent cell.
When same geographical environment had several operators with same TDD frequency, because asymmetrical dynamic assignment between stationary problem between the base station and the uplink downlink can be disturbed between the different network operators, this was that tdd mode is peculiar.
When TD-SCDMA system and UTRA TDD system coexist geographically, if two systems adopt adjacent frequency on employed frequency spectrum, because the difference of its identical time slot up-downlink configuration can produce very big phase mutual interference, even might cisco unity malfunction.For example, if the two is operated in the situation of adjacent frequency coexistence, the position of the ascending time slot of TD-SCDMA system just in time is the descending time slot of UTRA TDD system, the downstream signal of UTRA TDD can form very strong interference to the upward signal of TD-SCDMA like this, and the base station of TD-SCDMA can be received the upward signal of TD-SCDMA terminal and the interference that UTRATDD base station down leakage signal arrives the TD-SCDMA frequency simultaneously.
Phase mutual interference when reducing these two kinds of coexistence of systems needs the complicated network planning, as the site engineering, perhaps adopts high performance filter in base station and terminal radio frequency, reduces out-of-band radiation.But no matter adopt which kind of method, all will greatly improve system cost and complexity.
Summary of the invention
The purpose of this invention is to provide the method that a kind of tdd systems coexistence that reduces the different frame structure is disturbed, phase mutual interference when serving as the coexistence of elimination different system to overcome in the prior art needs higher cost, and realize complicated shortcoming, the mutual interference that produces when eliminating the tdd systems coexistence of different frame structure simply, effectively.
Another object of the present invention provides a kind of time division duplex radio communication network plan method, so that the coexistence of the tdd systems of different frame structure, and can not produce stronger mutual interference, satisfy the different business demands of applications.
For this reason, the invention provides following technical scheme:
The method that a kind of tdd systems coexistence that reduces the different frame structure is disturbed, comprise the tdd systems of described different frame structure time-division synchronous code division multiple access TD-SCDMA system and universal terrestrial radio insert time division duplex UTRA TDD system, and described method comprises:
A, obtain the time slot configuration and the frame structure timer clock of UTRA TDD system wireless frame structure;
B, obtain adjacent and use the time slot configuration of the TD-SCDMA system wireless frame structure of side frequency with described UTRA TDD system;
C, according to the time slot configuration and the frame structure timer clock of UTRA TDD system wireless frame structure, adjust the time slot configuration of TD-SCDMA system wireless frame structure.
Described step C comprises:
C1, the down link that obtains UTRA TDD system wireless frame and first transfer point between the up link;
In the relative time delay of C2, adjustment TD-SCDMA frame structure timer clock and UTRA tdd frame structure timer clock, alignd the deadline of the descending pilot frequency time slot DwPTS of first subframe in the TD-SCDMA system wireless frame structure with described first transfer point;
C3, obtain UTRA TDD system wireless frame other transfer points except that described first transfer point;
C4, adjust the configuration of the business time-slot in the TD-SCDMA system wireless frame structure according to the time slot configuration before and after other transfer points of described UTRA TDD system wireless frame.
Preferably, described step C4 further comprises:
C4 ', when the position of described other transfer points is in the middle of time slot of TD-SCDMA, the time period of this time slot zero-time to time period of this transfer point or this transfer point to this time slot cut-off point is set to idle component.
Preferably, described step C4 further comprises:
C4 ", three special time slots of second subframe in the TD-SCDMA system wireless frame structure only kept supplying capable pilot time slot UpPTS or descending pilot frequency time slot DwPTS use.
Preferably, described step C4 " comprising:
When the UTRA TDD system wireless frame slot of three special time slot correspondences of second subframe in the TD-SCDMA system wireless frame structure is distributed to up link and used, three special time slots of second subframe in the TD-SCDMA system wireless frame structure are only kept supplying capable pilot time slot UpPTS use;
When the UTRA TDD system wireless frame slot of three special time slot correspondences of second subframe in the TD-SCDMA system wireless frame structure is distributed to down link and used, three special time slots of second subframe in the TD-SCDMA system wireless frame structure are only used for descending pilot frequency time slot DwPTS.
A kind of time division duplex radio communication network plan method, described method comprises:
A, determine the position of each base station and the system pattern of use thereof according to service needed;
B, when adjacent base station adopts the tdd systems of different frame structure and uses side frequency, based on a kind of time slot configuration of tdd systems of frame structure wherein other system is carried out time slot configuration, different system ascending time slot and descending time slot are consistent.
The tdd systems of described different frame structure comprises: time-division synchronous code division multiple access TD-SCDMA system and universal terrestrial radio insert time division duplex UTRA TDD system.
Described step b is specially:
Based on the time slot configuration of universal terrestrial radio access time division duplex UTRA TDD system each system is carried out time slot configuration in the following manner:
B1, with first slot transmission downstream signal of UTRA TDD system wireless frame, second slot transmission upward signal;
B2, the transfer point between at least one uplink time slot and the downlink time slots is set behind second time slot of UTRA TDD system wireless frame;
B3, the synchronization point of TD-SCDMA system wireless frame is shifted to an earlier date the synchronization point of UTRA TDD system wireless frame, alignd with the deadline of first time slot in the UTRA TDD system wireless frame structure deadline of the descending pilot frequency time slot DwPTS of first subframe in the TD-SCDMA system wireless frame structure;
B4, determine the business time-slot of TD-SCDMA system wireless frame two system uplink time slots and descending time slot to be consistent according to the configuration of other time slots of UTRA TDD system wireless frame.
Preferably, described step b4 further comprises:
In TD-SCDMA system wireless frame structure, insert idle component in the time slot of corresponding described transfer point.
Preferably, described step b4 further comprises:
Three special time slots of second subframe in the TD-SCDMA system wireless frame structure are only kept supplying capable pilot time slot UpPTS or descending pilot frequency time slot DwPTS use.
By above technical scheme provided by the invention as can be seen, the present invention is directed to the situation that has mutual interference mutually based on the system of UTRA tdd frame structure or similar frame structure with based on the coexistence of systems of TD-SCDMA frame structure or similar frame structure the time, based on the time slot configuration arrangement of the system of UTRA tdd frame structure time slot configuration based on TD-SCDMA frame structure system, under the normal situation about using of three special time slots of first subframe in guaranteeing the TD-SCDMA system frame structure, in the partial service frame of TD-SCDMA, insert suitable idle component, make it consistent to greatest extent with the uplink and downlink timeslot arrangement maintenance in the UTRA tdd frame, thereby reduce even avoided occurring ascending time slot and the overlapping situation of descending time slot, interference when farthest having reduced the two coexistence has improved system effectiveness effectively.
The method that tdd systems coexistence by elimination different frame structure provided by the invention is disturbed, when carrying out the network planning, can make the tdd systems coexistence of different frame structure, and can not produce stronger mutual interference, thereby can satisfy various different business demands of applications.
Description of drawings
Fig. 1 is a TD-SCDMA system wireless frame structure schematic diagram;
Fig. 2 is the subframe structure schematic diagram of TD-SCDMA system;
Fig. 3 is a TD-SCDMA time slot allocation pattern diagram;
Fig. 4 is the wireless frame structure schematic diagram of UTRA TDD system;
Fig. 5 is a UTRA TDD time slot allocation pattern diagram;
Fig. 6 is the realization flow figure that the present invention reduces the method that the tdd systems coexistence of different frame structure disturbs;
Fig. 7 is the TD-SCDMA frame structure contrast schematic diagram of UTRA tdd frame structure and unmatched;
Fig. 8 utilizes the present invention that the TD-SCDMA frame structure is carried out adjusted schematic diagram;
Fig. 9 is the realization flow figure of time division duplex radio communication network plan method of the present invention;
Time slot allocation schematic diagram when Figure 10 is the TDD coexistence of systems of different spreading rates in the network planning.
Embodiment
Core of the present invention is when UTRA TDD system and TD-SCDMA coexistence of systems, based on the time slot configuration arrangement of the system of the UTRATDD frame structure time slot configuration based on TD-SCDMA frame structure system.When specific implementation, consider that (each radio frames comprises 2 subframes for the identical point (each wireless frame length is 10ms) of two system wireless frame structures and the uniqueness of TD-SCDMA system wireless frame structure, 3 special time slots are arranged) in each subframe, time slot configuration with UTRA TDD system is a benchmark, determines the time slot allocation of TD-SCDMA system.Guarantee the normal use of the special time slot in first subframe in the TD-SCDMA system wireless frame structure, second special time slot in the subframe only is used alone as to be used for descending pilot frequency time slot or uplink pilot time slot, insert idle component in the time slot corresponding to UTRA TDD system frame structure transfer point, the uplink and downlink timeslot arrangement in the time slot allocation and UTRA TDD system keeps consistent to greatest extent in the TD-SCDMA system thereby make.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
The present technique field personnel know, in tdd systems, the transmission of signal comprise from the base station to the terminal transmission (being called down link) and from the transmission (being called up link) of terminal to base station.A radio frames comprises a plurality of time slots, and the duration of different time-gap can be identical, also can be different.Up link and down link use a different time-gap in the radio frames to transmit respectively.
The frame structure of the physical layer channel of TD-SCDMA system is divided into three layers: radio frames (Radio Frame), subframe (Sub-Frame) and time slot (Time Slot, or be called burst Burst).
TD-SCDMA system wireless frame structure is as shown in Figure 1:
Each wireless frame length is 10ms, is divided into the subframe of two 5ms.
TD-SCDMA system subframe structure is as shown in Figure 2:
A subframe lengths is 5ms, adopts chip (chip) speed of 1.28Mcps.Each subframe is made of 7 conventional time slots (TS0-TS6, each slot length are 675 μ s) and 3 special time slots: descending pilot frequency time slot DwPTS (length is 75us), uplink pilot time slot UpPTS (length is 125us) and protection time slot GP (length is 75us).Wherein, DwPTS is made up of the 64bit orthogonal code, and it is the pilot signal of wireless base station (sub-district), also is the signal of down-going synchronous.And UpPTS is made up of the 128bit orthogonal code, and it is the pilot signal of user terminal (sub-district), and is main as inserting at random.GP is used for the differentiating uplink and downlink time slot, makes distance terminal far away can realize uplink synchronous.In the TD-SCDMA system, the width of this time slot has guaranteed that the maximum radius of sub-district may reach more than the 10km.
In 7 conventional time slots, TS0 always distributes to down link DL, be the downlink broadcast time slot, and TS1 always distributes to up link UL.Separate by transfer point SP between ascending time slot and the descending time slot.In the TD-SCDMA system, the subframe of each 5ms has two transfer points (UL to DL and DL to UL).By disposing the number of uplink and downlink timeslot flexibly, TD-SCDMA is applicable to the symmetric and asymmetric pattern of up-downgoing.
Fig. 3 has provided the example of symmetrical distribution and asymmetric distribution uplink downlink respectively.
When the time slot symmetric pattern, the time slot of up link and downlink allocation same number, in the figure, TS1, TS2, TS3 distribute to up link, and TS4, TS5, TS6 distribute to down link.Make the up-downgoing data keep identical transmission rate like this;
When the time slot asymmetric mode, the time slot of up link and the different numbers of downlink allocation, in the figure, TS1, TS2 distribute to up link, and TS3, TS4, TS5, TS6 distribute to down link.Make the up-downgoing data keep different transmission rates like this, to adapt to the data service of uplink downlink needs different transmission rates, such as the data service of IP type.
UTRA TDD system wireless frame structure is as shown in Figure 4:
A radio frames length is 10ms, adopts the spreading rate of 3.84Mcps.Comprise 15 isometric time slots.Wherein, Tc represents the time of a chip (chip).
For UTRA TDD, each time slot both can have been distributed to up, also can distribute to descending, a kind of method of salary distribution of up-downgoing symmetry as shown in Figure 5:
Wherein, TS0 to TS7 distributes to down link, and TS8 to TS14 distributes to up link.
These characteristics based on UTRA TDD system and TD-SCDMA system frame structure, when needs UTRATDD system and TD-SCDMA coexistence of systems, the time slot configuration arrangement of system that the present invention is based on UTRA tdd frame structure is based on the time slot configuration of TD-SCDMA frame structure system, so that the uplink and downlink timeslot arrangement in time slot allocation and the UTRA TDD system keeps consistent to greatest extent in the TD-SCDMA system, between the reduction system owing to the inconsistent phase mutual interference that causes of uplink and downlink timeslot distribution.
With reference to Fig. 6, Fig. 6 shows the realization flow of the method that tdd systems coexistence that the present invention reduces the different frame structure disturbs, and may further comprise the steps:
Step 601: the time slot configuration and the frame structure timer clock that obtain UTRA TDD system wireless frame structure.
Because the operator of different system may be different, therefore when the network planning, do not consider the influence of other system, for the tdd systems worker that makes the different frame structure can not produce stronger mutual interference when the operation, just need make in the TD-SCDMA system time slot allocation consistent to greatest extent with the uplink and downlink timeslot arrangement maintenance in the UTRA TDD system.Like this, just need know the time slot allocation situation of other adjacent system radio frames of using side frequency.
Though the wireless frame length of UTRA TDD system and TD-SCDMA system is 10ms, by the description of front as can be known, these two kinds of systems but are different to the division of time slot.
For UTRA TDD system, a radio frames is divided into 15 isometric time slots, and each time slot both can have been distributed to up link and use, and also can distribute to down link and use; And for the TD-SCDMA system, a radio frames comprises 2 subframes, and each subframe is divided into 7 conventional time slots and 3 special time slots.In order to make TD-SCDMA system operate as normal, in these 7 conventional time slots, TS0 need distribute to down link and use, and TS1 need distribute to the up link use.
Step 602: the time slot configuration of obtaining the TD-SCDMA system wireless frame structure of and use side frequency adjacent with UTRA TDD system.
Equally, the TD-SCDMA system also may be independent planning, the position of base station and the frequency of use may all configure, increase the difficulty of system design in order not make system do big change, only need are adjusted the time slot configuration of the TD-SCDMA system wireless frame structure of and use side frequency adjacent with UTRA TDD system.
Be step 603:, adjust the time slot configuration of the TD-SCDMA system wireless frame structure that obtains according to the time slot configuration and the frame structure timer clock of UTRA TDD system wireless frame structure.
Below in conjunction with the adjustment mode of Fig. 7 detailed description to the time slot configuration of TD-SCDMA system wireless frame structure.
With reference to Fig. 7, Fig. 7 is the TD-SCDMA frame structure contrast schematic diagram of UTRA tdd frame structure and unmatched:
In this embodiment, the time slot configuration of UTRA TDD is: 1st, 2 time slot allocation are given down link, and the 3rd, 4,5 time slot allocation are given up link, and the 6th to the 10th time slot allocation is given down link, 11st, 12 time slot allocation are given up link, and the 13rd, 14,15 time slot allocation are given down link.So first transfer point between down link and the up link is in the deadline of the 2nd time slot.
The time slot configuration of first subframe was before TD-SCDMA adjusted: TS0 is a descending time slot, and TS1, TS2, TS3 are ascending time slot, and TS4, TS5, TS6 are descending time slot; The time slot configuration of second subframe is: TS0 is a descending time slot, and TS1, TS2 are ascending time slot, and TS3, TS4, TS5, TS6 are descending time slot
When the time slot configuration of TD-SCDMA being adjusted, at first obtain the down link of UTRA TDD system wireless frame and first transfer point between the up link based on the time slot configuration of UTRA TDD.
Then, adjust the relative time delay of TD-SCDMA frame structure timer clock and UTRA tdd frame structure timer clock, alignd with first transfer point the deadline of the descending pilot frequency time slot DwPTS of first subframe in the TD-SCDMA system wireless frame structure.
Because TD-SCDMA system requirements TS0 distributes to down link and uses, TS1 distributes to up link and uses, and between TS0 and TS1, also have three special time slots, therefore in order to satisfy these requirements of TD-SCDMA system, the TD-SCDMA radio frames can be moved back UTRA TDD radio frames, alignd with the deadline of the 2nd time slot of UTRA TDD radio frames the deadline of the descending pilot frequency time slot DwPTS of first subframe of TD-SCDMA.
Can make the TD-SCDMA system adopt identical reference clock, such as GPS (global positioning system) standard time with UTRA TDD system.Because the length of each conventional time slot is 675 microseconds in the TD-SCDMA radio frames, the DwPTS frame length is 75 microseconds, and the length of each time slot was 666.7 emblem seconds in the UTRA TDD radio frames, therefore, calculate and the TD-SCDMA radio frames is moved UTRA TDD radio frames 583.4 emblems, back can satisfy above-mentioned requirements second.
Like this, can guarantee the basic demand of TD-SCDMA system frame structure time slot allocation.
The uplink and downlink timeslot arrangement in the time slot allocation and UTRA TDD system keeps consistent to greatest extent in the TD-SCDMA system in order to make, and the distribution of other time slots should be with reference to the arrangement of time slot in the UTRATDD radio frames in the TD-SCDMA radio frames.
Because TD-SCDMA system and UTRA TDD system frame structure characteristics separately make to align the deadline of the corresponding time slot of two systems.Therefore, can further dispose other time slots of TD-SCDMA radio frames according to the transfer point in the UTRA TDD system wireless frame.
As seen from the figure, the 2nd transfer point in the UTRA TDD radio frames is arranged in the TS3 of first subframe of TD-SCDMA, therefore, TS1, TS2, the TS3 of first subframe disposed to up link, and it is not a part is inserted idle component behind TS3, so that overlapping with the 6th time slot of UTRA TDD.TS4, TS5, the TS6 of back are disposed to down link.
Equally, can be in the TD-SCDMA wireless frame structure the preceding part of TS3 of second subframe insert idle component, make the 12nd the descending crack in itself and the UTRA TDD radio frames can be not overlapping.
The TD-SCDMA frame structure is carried out adjusted time slot configuration as shown in Figure 8.
For the uplink-downlink configuration of 3 special time slots in second subframe further avoiding the TD-SCDMA radio frames and UTRA TDD wireless timeslot overlaps, 3 special time slots in second subframe can according to circumstances be adjusted use, such as, according to the up-downgoing distribution condition of UTRA TDD system wireless frame correspondence position time slot, three special time slots of second subframe in the TD-SCDMA system wireless frame structure are only kept supplying capable pilot time slot UpPTS or only use for descending pilot frequency time slot DwPTS.Use if corresponding UTRATDD time slot allocation is a down link, then the time slot of Dui Ying TD-SCDMA only supplies DwPTS, otherwise, only use for UpPTS.
When the network planning, can utilize the present invention, take all factors into consideration two kinds of system's application demands separately, wireless network is optimized design.
With reference to Fig. 9, Fig. 9 is the realization flow figure of time division duplex radio communication network plan method of the present invention, may further comprise the steps:
Step 901: determine the position of each base station and the system pattern of use thereof according to service needed.
Though UTRA TDD system and TD-SCDMA system all adopt tdd mode, in actual applications, UTRA TDD is primarily aimed at the wireless access data service, and coverage is less, and TD-SCDMA is a complete mobile communication system, supports various application scenarioss.Therefore,, need two kinds of coexistence of systems sometimes, at this moment just need to consider how to avoid because the phase mutual interference that the difference of uplink and downlink timeslot configuration produces user's received signal according to business demand.
Step 902: when adjacent base station adopts the tdd systems of different frame structure and uses side frequency, based on a kind of time slot configuration of tdd systems of frame structure wherein other system is carried out time slot configuration, different system ascending time slot and descending time slot are consistent.
The present technique field personnel know, for the TDD system, according to its difference such as modulation system that adopt, also can be divided into the multiple systems pattern, such as: TD-SCDMA system, UTRA TDD system etc.When the coexistence of systems of these different modes, can be with the time slot configuration of a kind of TDD system of frame structure wherein as benchmark, according to this benchmark other TDD systems are carried out time slot configuration, thereby different system ascending time slot and descending time slot are consistent, to avoid because the phase mutual interference that the difference of uplink and downlink timeslot configuration produces user's received signal.
Following mask body is an example based on the time slot configuration of UTRA TDD system each system is carried out time slot configuration, is elaborated.
At first, with the 1st slot transmission downstream signal of UTRA TDD system wireless frame, the 2nd slot transmission upward signal.
Owing in the TD-SCDMA system, require the subframe of each 5ms that two transfer points are arranged, therefore, the transfer point between at least one uplink time slot and the downlink time slots be set behind the 2nd time slot of UTRA TDD system wireless frame.
Then, the synchronization point of TD-SCDMA system wireless frame is shifted to an earlier date the synchronization point of UTRA TDD system wireless frame, alignd with the deadline of first time slot in the UTRA TDD system wireless frame structure deadline of the descending pilot frequency time slot DwPTS of first subframe in the TD-SCDMA system wireless frame structure.
Can be with reference to two system frame structure time slot allocation schematic diagrames shown in Figure 10:
For making in the TD-SCDMA frame structure DwPTS time slot deadline and UTRA TDD TS1 time slot by alignment, the TD-SCDMA frame can shift to an earlier date UTRA tdd frame 83.3 microseconds, since long 675 microseconds of TD-SCDMATS0, DwPTS frame length 75 microseconds, long 666.7 microseconds of UTRA TDD TS.A part is inserted idle component (Idle) behind the TS3 of TD-SCDMA frame structure time slot, makes with the 5th the descending time slot of UTRATDD not overlapping.Equally, can in the TD-SCDMA frame structure, the preceding part of the TS3 of second subframe insert idle component, make itself and the 11st descending time slot of UTRA TDD not overlapping.
Other business time-slots can adopt method similar to the above, insert certain idle component and adjust alignment relation with UTRA tdd frame structure.And special time slot can according to circumstances be adjusted operating position.
To three special time slots of first subframe of TD-SCDMA frame structure, the DwPTS time slot, GP and UpPTS can normally use, and three special time slots of second subframe can according to circumstances be adjusted use.Such as, according to the uplink and downlink timeslot distribution condition of UTRA TDD correspondence position time slot, use if be assigned as down link, can use for DwPTS, and UpPTS does not use.If corresponding UTRA TDD position time slot is to be assigned as up link to use, then can use, and DwPTS does not use for UpPTS.
Certainly, can also adjust the frame structure alignment thereof of two kinds of systems arbitrarily according to the principle of the invention according to actual needs.
Similar to the above with its time slot configuration to the implementation procedure that each system carries out time slot configuration in other TDD systems, do not repeat them here.
In the above embodiments, be example only with existing UTRA TDD system and TD-SCDMA system, describe the implementation procedure of the inventive method in detail, but the present invention is not limited to existing UTRA TDD system and TD-SCDMA system, the present invention can be applicable to any system based on UTRA tdd frame structure and system based on the TD-SCDMA frame structure, as the system based on the OFDM modulation system.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (10)
1, a kind of method that reduces the tdd systems coexistence interference of different frame structure, comprise the tdd systems of described different frame structure time-division synchronous code division multiple access TD-SCDMA system and universal terrestrial radio insert time division duplex UTRA TDD system, it is characterized in that described method comprises:
A, obtain the time slot configuration and the frame structure timer clock of UTRA TDD system wireless frame structure;
B, obtain adjacent and use the time slot configuration of the TD-SCDMA system wireless frame structure of side frequency with described UTRA TDD system;
C, according to the time slot configuration and the frame structure timer clock of UTRA TDD system wireless frame structure, adjust the time slot configuration of TD-SCDMA system wireless frame structure.
2, method according to claim 1 is characterized in that, described step C comprises:
C1, the down link that obtains UTRA TDD system wireless frame and first transfer point between the up link;
In the relative time delay of C2, adjustment TD-SCDMA frame structure timer clock and UTRA tdd frame structure timer clock, alignd the deadline of the descending pilot frequency time slot DwPTS of first subframe in the TD-SCDMA system wireless frame structure with described first transfer point;
C3, obtain UTRA TDD system wireless frame other transfer points except that described first transfer point;
C4, adjust the configuration of the business time-slot in the TD-SCDMA system wireless frame structure according to the time slot configuration before and after other transfer points of described UTRA TDD system wireless frame.
3, method according to claim 2 is characterized in that, described step C4 further comprises:
C4 ', when the position of described other transfer points is in the middle of time slot of TD-SCDMA, the time period of this time slot zero-time to time period of this transfer point or this transfer point to this time slot cut-off point is set to idle component.
4, according to claim 2 or 3 described methods, it is characterized in that described step C4 further comprises:
C4 ", three special time slots of second subframe in the TD-SCDMA system wireless frame structure only kept supplying capable pilot time slot UpPTS or descending pilot frequency time slot DwPTS use.
5, method according to claim 4 is characterized in that, described step C4 " comprising:
When the UTRA TDD system wireless frame slot of three special time slot correspondences of second subframe in the TD-SCDMA system wireless frame structure is distributed to up link and used, three special time slots of second subframe in the TD-SCDMA system wireless frame structure are only kept supplying capable pilot time slot UpPTS use;
When the UTRA TDD system wireless frame slot of three special time slot correspondences of second subframe in the TD-SCDMA system wireless frame structure is distributed to down link and used, three special time slots of second subframe in the TD-SCDMA system wireless frame structure are only used for descending pilot frequency time slot DwPTS.
6, a kind of time division duplex radio communication network plan method is characterized in that, described method comprises:
A, determine the position of each base station and the system pattern of use thereof according to service needed;
B, when adjacent base station adopts the tdd systems of different frame structure and uses side frequency, based on a kind of time slot configuration of tdd systems of frame structure wherein other system is carried out time slot configuration, different system ascending time slot and descending time slot are consistent.
7, method according to claim 6 is characterized in that, the tdd systems of described different frame structure comprises: time-division synchronous code division multiple access TD-SCDMA system and universal terrestrial radio insert time division duplex UTRA TDD system.
8, method according to claim 7 is characterized in that, described step b is specially:
Based on the time slot configuration of universal terrestrial radio access time division duplex UTRA TDD system each system is carried out time slot configuration in the following manner:
B1, with first slot transmission downstream signal of UTRA TDD system wireless frame, second slot transmission upward signal;
B2, the transfer point between at least one uplink time slot and the downlink time slots is set behind second time slot of UTRA TDD system wireless frame;
B3, the synchronization point of TD-SCDMA system wireless frame is shifted to an earlier date the synchronization point of UTRA TDD system wireless frame, alignd with the deadline of first time slot in the UTRA TDD system wireless frame structure deadline of the descending pilot frequency time slot DwPTS of first subframe in the TD-SCDMA system wireless frame structure;
B4, determine the business time-slot of TD-SCDMA system wireless frame two system uplink time slots and descending time slot to be consistent according to the configuration of other time slots of UTRA TDD system wireless frame.
9, method according to claim 8 is characterized in that, described step b4 further comprises:
In TD-SCDMA system wireless frame structure, insert idle component in the time slot of corresponding described transfer point.
10, according to Claim 8 or 9 described methods, it is characterized in that described step b4 further comprises:
Three special time slots of second subframe in the TD-SCDMA system wireless frame structure are only kept supplying capable pilot time slot UpPTS or descending pilot frequency time slot DwPTS use.
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