CN1980089B - Method and apparatus for judging whether the downlink synchronization punch at TD-SCDMA system - Google Patents

Abstract

The invention is especially related to method and device for determine whether down synchronization in TD-SCDMA system is perforated or not. Using projected window method detects DwPTS signal. Output modes of projected window are different between perforation and not perforation in down synchronization within same frame. The disclosed device can determine whether down synchronization of base station needed to search is perforated or not. Then, based on different perforated modes, the invention can use different sector searching methods in order to lower sector-searching time. Comparing with prior art, the invention overcomes technical issue of interference caused by receiving UpPTS, and DwPTS signal from other base station at same time.

Description

Decision method and device that whether a kind of TD-SCDMA system descending punches synchronously

Technical field

The present invention relates to the small region search method of 3-G (Generation Three mobile communication system) (3G, 3rd Generation), decision method and device that whether particularly a kind of TD-SCDMA system descending punches synchronously.

Background technology

In recent years, along with communication applications, particularly wireless telecommunications aspect, high speed development, increasing new technology is applied in the current communication system.Because the finiteness of wireless telecommunications resource requirement--frequency spectrum--, engineers make great efforts to develop various technology again to improve the availability of frequency spectrum of communication system.

TD-SCDMA (Time Division Synchronization Code Division MultiAccess, TD SDMA) system is as 3G (3rd generation, the third generation) a kind of in the communication system standards system can satisfy the requirement for the frequency deviation utilance.The up-downgoing duplex mode of this system is TDD (Time Division Duplex, a time division duplex), may have the phase mutual interference between its up-downgoing.At present, the transmission frame structure of the TD-SCDMA system of standard as shown in Figure 1, DwPTS (Downlink Pilot Time Slot wherein, descending pilot frequency time slot) is UE (User Equipment, subscriber equipment) carries out the foundation of Cell searching, and the request of access at random of UpPTS (Uplink Pilot Time Slot, uplink pilot time slot) carrying UE.

Because the distance between the base station can make this base station when carrying out the UpPTS reception, receives the DwPTS signal of other base stations simultaneously, causes interference, as shown in Figure 2.Therefore, be suggested, to increase the possibility that UE enters at random as the DwPTS drilling method of Fig. 3.Second DwPTS wherein do not launch.

The DwPTS of general UE Cell searching adopts the structure of sliding window as shown in Figure 4 and judgement structure as shown in Figure 5 synchronously.When the maximum of sliding window output greater than a certain definite thresholding (this thresholding has the system emulation definition), determine that then this maximum value position detects DwPTS, general time decision is 1 subframe (5ms).Export as shown in Figure 6 and Figure 7 for the sliding window that DwPTS does not punch and punches, obviously both exist significant difference.Punching pattern according to different can adopt different small region search methods, reduces the Cell searching time.

Summary of the invention

The purpose of this invention is to provide decision method and device that whether a kind of TD-SCDMA system descending punches synchronously, overcome when carrying out the UpPTS reception in the prior art, receive the DwPTS signal of other base stations simultaneously, cause the technical problem of interference, and according to different punching patterns, can adopt different small region search methods, reduce the Cell searching time.

For solving the problems of the technologies described above, the present invention is achieved in that

The decision method whether a kind of TD-SCDMA system descending punches synchronously is characterized in that flow process is as follows: wherein R is a coherent value, and r is the sampling of R, and Loc is the correspondence position of downlink synchronization slot;

1) carries out radio frequency and receive and modulation, the radiofrequency signal of controlling is converted into baseband signal;

2) calculate the energy of received signal, the energy of signal x is | x| ², wherein || for plural number is asked modular arithmetic;

3) energy with a frame signal correspondence stores among the array P;

4) sequence of calculation $R_{1j}=\underset{k=0}{\overset{32}{\mathrm{\Σ}}}{P}_{k+j};$

5) sequence of calculation $R_{2j}=\underset{k=0}{\overset{95}{\mathrm{\Σ}}}{P}_{k+32+j};$

6) sequence of calculation $R_{3j}=\underset{k=0}{\overset{32}{\mathrm{\Σ}}}{P}_{k+128+j};$

7) sequence of calculation R _13j=R _1j+ R _3j

8) sequence of calculation R _j=R _2j/ R _13j

9) store the R of two subframe correspondences in this frame _jIn array R;

10) search maximum among the R, record numerical value is r ₁, the position is Loc ₁

11) with Loc among the R ₁Front and back 48 data assignment respectively are 0;

12) search maximum among the R again, record numerical value is r ₂, the position is Loc ₂

13) calculate r ' ₁=max (r ₁, r ₂) and r ' ₂=min (r ₁, r ₂), wherein max is a maximum, min is a minimum value;

14) write down corresponding r ' ₁And r ' ₂The position be Loc ' ₁And Loc ' ₂

15) judge r ' ₁Whether greater than T * r ' ₂, wherein T is the thresholding by the system emulation decision, if enter 16), otherwise enter 18);

16)Loc＝Loc′ ₁；

17) the down-going synchronous pattern is no punching pattern, enters 20);

18)Loc＝(Loc′ ₁×r′ ₁+Loc′ ₂×r′ ₂)/(r′ ₁+r′ ₂)；

19) the down-going synchronous pattern is the punching pattern;

20) output Loc and down-going synchronous pattern.

A kind of device of realizing the decision method whether above-mentioned TD-SCDMA system descending punches synchronously, comprise sliding window and maximum and choice of location device thereof, it is characterized in that: on the one hand, after maximum and choice of location thereof, determine the down-going synchronous position through weighted average; On the other hand, make down-going synchronous punching judgement by comparator.

The device of the decision method whether described realization TD-SCDMA system descending punches synchronously is characterized in that: after maximum selection and minimum value selection and thresholding selection, make down-going synchronous punching judgement by comparator again.

The device of the decision method whether described realization TD-SCDMA system descending punches synchronously, it is characterized in that: what import sliding window is baseband signal.

By technique scheme, the technique effect that the present invention has is:

1, the present invention proposes and utilize sliding window method, detect the DwPTS signal.Because the punching of the down-going synchronous in a frame is different with the sliding window output mode that does not punch, whether the device that the present invention proposes can be adjudicated needs the base station down of search to punch synchronously.Punching pattern according to different can adopt different small region search methods, reduces the Cell searching time.

2, the present invention has overcome when carrying out the UpPTS reception in the prior art, receives the DwPTS signal of other base stations simultaneously, causes the technical problem of interference.

Description of drawings

Fig. 1 is TD-SCDMA system frame structure figure.

Fig. 2 is the disturbed situation schematic diagram of base station UpPTS.

Fig. 3 is the TD-SCDMA system frame structure figure with DwPTS punching.

Fig. 4 is the synchronous sliding window of DwPTS.

Fig. 5 is a DwPTS synchronization decisions structure chart.

Fig. 6 is the sliding window output under not punching of the DwPTS situation.

Fig. 7 is the sliding window output under the DwPTS punching situation.

Fig. 8 is the flow chart of the inventive method.

Fig. 9 is a structure drawing of device of the present invention.

Embodiment

Of the present invention theing contents are as follows:

Flow process of the present invention as shown in Figure 8, wherein R is a coherent value, r is the sampling of R, Loc is the DwPTS correspondence position.

1) carries out radio frequency and receive and modulation, the radiofrequency signal of controlling is converted into baseband signal;

2) calculate the energy of received signal, the energy of signal x is | x| ², wherein || for plural number is asked modular arithmetic;

3) energy with a frame signal correspondence stores among the array P;

4) sequence of calculation $R_{1j}=\underset{k=0}{\overset{32}{\mathrm{\Σ}}}{P}_{k+j};$

5) sequence of calculation

6) sequence of calculation $R_{3j}=\underset{k=0}{\overset{32}{\mathrm{\Σ}}}{P}_{k+128+j};$

7) sequence of calculation R _13j=R _1j+ R _3j

8) sequence of calculation R _j=R _2j/ R _13j

9) store the R of two subframe correspondences in this frame _jIn array R;

10) search maximum among the R, record numerical value is r ₁, the position is Loc ₁

11) with Loc among the R ₁Front and back 48 data assignment respectively are 0;

12) search maximum among the R again, record numerical value is r ₂, the position is Loc ₂

13) calculate r ' ₁=max (r ₁, r ₂) and r ' ₂=min (r ₁, r ₂), wherein max is a maximum, min is a minimum value;

14) write down corresponding r ' ₁And r ' ₂The position be Loc ' ₁And Loc ' ₂

15) judge r ' ₁Whether greater than T * r ' ₂, wherein T is the thresholding by the system emulation decision, if enter 16), otherwise enter 18);

16)Loc＝Loc′ ₁；

17) the down-going synchronous pattern is no punching pattern, enters 20);

18)Loc＝(Loc′ ₁×r′ ₁+Loc′ ₂×r′ ₂)/(r′ ₁+r′ ₂)；

19) the down-going synchronous pattern is the punching pattern;

20) output Loc and down-going synchronous pattern.

Implementation structure of the present invention as shown in Figure 9.Wherein, this device comprises sliding window and maximum and choice of location device thereof.It is characterized in that: on the one hand, after maximum and choice of location thereof, determine the down-going synchronous position through weighted average; On the other hand, make down-going synchronous punching judgement by comparator.

Should make down-going synchronous punching judgement by comparator again by after maximum selection and minimum value selection and the thresholding selection.

This input sliding window be baseband signal.

Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.

Claims (3)

1. decision method whether the TD-SCDMA system descending punches synchronously, it is characterized in that flow process is as follows: wherein R is a coherent value, and r is the sampling of R, and Loc is the correspondence position of downlink synchronization slot;

1) carries out radio frequency and receive and modulation, the radiofrequency signal of controlling is converted into baseband signal;

2) calculate the energy of received signal, the energy of signal x is | x| ², wherein || for plural number is asked modular arithmetic;

3) energy with a frame signal correspondence stores among the array P;

4) sequence of calculation $R_{1j}=\underset{k=0}{\overset{32}{\mathrm{\Σ}}}{P}_{k+j};$

5) sequence of calculation $R_{2j}=\underset{k=0}{\overset{95}{\mathrm{\Σ}}}{P}_{k+32+j};$

6) sequence of calculation $R_{3j}=\underset{k=0}{\overset{32}{\mathrm{\Σ}}}{P}_{k+128+j};$

7) sequence of calculation R _13j=R _1j+ R _3j

8) sequence of calculation R _j=R _2j/ R _13j

9) store the R of two subframe correspondences in this frame _jIn array R;

10) search maximum among the R, record numerical value is r ₁, the position is Loc ₁

11) with Loc among the R ₁Front and back 48 data assignment respectively are 0;

12) search maximum among the R again, record numerical value is r ₂, the position is Loc ₂

13) calculate r ' ₁=max (r ₁, r ₂) and r ' ₂=min (r ₁, r ₂), wherein max is a maximum, min is a minimum value;

14) write down corresponding r ' ₁And r ' ₂The position be Loc ' ₁And Loc ' ₂

15) judge r ' ₁Whether greater than T * r ' ₂, wherein T is the thresholding by the system emulation decision, if enter 16), otherwise enter 18);

16)Loc＝Loc′ ₁；

17) the down-going synchronous pattern is no punching pattern, enters 20);

18)Loc＝(Loc′ ₁×r′ ₁+Loc′ ₂×r′ ₂)/(r′ ₁+r′ ₂)；

19) the down-going synchronous pattern is the punching pattern;

20) output Loc and down-going synchronous pattern.

2. device of realizing the decision method whether TD-SCDMA system descending as claimed in claim 1 punches synchronously, comprise sliding window and maximum and choice of location device thereof, it is characterized in that: on the one hand, after maximum and choice of location thereof, determine the down-going synchronous position through weighted average; On the other hand, make down-going synchronous punching judgement by comparator.

3. the device of the decision method whether realization TD-SCDMA system descending according to claim 2 punches synchronously is characterized in that: after maximum selection and minimum value selection and thresholding selection, make down-going synchronous punching judgement by comparator again.

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