CN101217308B - For synchronization channel transmission method and the device of tdd systems - Google Patents
For synchronization channel transmission method and the device of tdd systems Download PDFInfo
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- CN101217308B CN101217308B CN200810001078.XA CN200810001078A CN101217308B CN 101217308 B CN101217308 B CN 101217308B CN 200810001078 A CN200810001078 A CN 200810001078A CN 101217308 B CN101217308 B CN 101217308B
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Abstract
The invention provides a kind of synchronization channel transmission method for TDD system, comprise the following steps: be arranged on by the primary synchronization channel in synchronizing channel in first OFDM symbol of DwPTS, its circulating prefix-length is 144Ts; And UpPTS and GP is set, to make the Cyclic Prefix of each symbol on DwPTS identical.Present invention also offers a kind of synchronizing channel dispensing device for TDD system, comprising: first arranges module, for being arranged on by the primary synchronization channel in synchronizing channel in first OFDM symbol of DwPTS, its circulating prefix-length is 144Ts; And second arranges module, for arranging UpPTS and GP, to make the Cyclic Prefix of each symbol on DwPTS identical.The synchronizing channel utilizing the present invention to design can simplify the initial search process of dual-mode, and simplifies DwPTS time slot processing procedure.
Description
Technical field
The present invention relates to the communications field, be used for synchronization channel transmission method and the device of TDD (TimeDivision Duplex, time division duplex) system in particular to one.
Background technology
The frame structure of LTE (Long Term Evolution, Long Term Evolution) system TDD mode, as shown in Figure 1.In this frame structure; a 10ms (307200Ts; radio frames 1ms=30720Ts) is divided into the field of two 5ms, and it is 0.5ms (15360Ts) time slot and 3 special time slots that each field comprises 8 length: descending pilot frequency time slot DwPTS (Downlink Pilot Time Slot), protection interval GP (Guard Period) and uplink pilot time slot UpPTS (Uplink Pilot Time Slot).The length of these three each time slots of special time slot is configurable, but total length is 1ms (30720Ts).It is the subframe of 1ms that the time slot of every two 0.5ms forms a length, is numbered subframe #0 ~ subframe #9, and wherein, subframe #1 and subframe #6 comprises above-mentioned said special time slot, and subframe #0 and subframe #5 is fixed as descending time slot.Also there is another kind of model F DD (FrequencyDivision Duplex, Frequency Division Duplexing (FDD)) in current LTE system.
Fig. 2 is the structural representation of synchronizing channel under tdd mode and fdd mode in existing LTE system.For two kinds of patterns, when adopting normal cyclic prefix CP (Cyclic Prefix), the structure of its synchronizing channel as shown in Figure 2.For FDD system, its primary synchronization channel P-SCH (Primary Synchronization Channel) sends on last OFDM (the Orthogonal Frequency Division Multiplexing) symbol of subframe #0 and subframe #5, and auxiliary synchronization channel S-SCH (Secondary Synchronization Channel) sends in the penultimate OFDM symbol of subframe #0 and subframe #5.And for TDD system, P-SCH sends on first symbol of DwPTS time slot, S-SCH sends on last symbol of subframe #0 and subframe #5.
Realizing in process of the present invention, inventor finds that in prior art, at least there are the following problems:
As can be seen from Figure 2, during for employing normal cyclic prefix, because first OFDM symbol of each time slot has had more 16Ts (160-144=16) relative to the CP of other OFDM symbol, therefore, when initial cell search, after completing the Timing Synchronization of P-SCH, when carrying out S-SCH detection according to the timing of P-SCH, for different dual-modes, will there is timing ambiguities in S-SCH.That is, for two kinds of dual-modes, the fixed time interval between P-SCH and S-SCH is different.Therefore, when user equipment (UE) (User Equipment) is when carrying out initial ranging, in time not having the duplex mode information about system, UE can not obtain correct S-SCH timing position after P-SCH timing has detected.
Summary of the invention
The present invention aims to provide a kind of synchronization channel transmission method for TDD system and device, can solve the problem of the timing ambiguities of S-SCH in two class dual-modes in prior art.
In an embodiment of the present invention, provide a kind of synchronization channel transmission method for tdd systems, comprise the following steps: be arranged on by the primary synchronization channel in synchronizing channel in first OFDM symbol of DwPTS, its circulating prefix-length is 144Ts; And UpPTS and GP is set, to make the Cyclic Prefix of each symbol on DwPTS identical.
Preferably, arrange UpPTS and GP, to make, the Cyclic Prefix of each symbol on DwPTS is identical specifically to be comprised: the symbol being 160Ts by 2 Cyclic Prefix is arranged in UpPTS; Or the symbol being 160Ts by 2 Cyclic Prefix is arranged in GP; Or the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, is that the symbol of 160Ts is arranged in UpPTS by individual Cyclic Prefix; Or the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS.
Preferably, the symbol being 160Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP1)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol being 160Ts by 2 Cyclic Prefix is arranged in GP and specifically comprises: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 2, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-(N+M) × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1,2; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP1)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses cyclic prefix CP 3=CP1+ (CP1-CP2)/2, the circulating prefix-length of the upper all symbols of DwPTS is all CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP3)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
In an embodiment of the present invention, additionally provide a kind of synchronizing channel dispensing device for wireless communication system, comprise: the first module, for being arranged on by the primary synchronization channel in synchronizing channel in first OFDM symbol of DwPTS, its circulating prefix-length is 144Ts; And second module, for arranging UpPTS and GP, to make the Cyclic Prefix of each symbol on DwPTS identical.
Preferably, the second module specifically comprises at least one unit following: first module, is arranged in UpPTS for the symbol being 160Ts by 2 Cyclic Prefix; Second unit, is arranged in GP for the symbol being 160Ts by 2 Cyclic Prefix; Unit the 3rd, is arranged in GP for the symbol being 160Ts by 1 Cyclic Prefix, and the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS; Unit the 4th, is arranged in GP for the symbol being 160Ts by 1 Cyclic Prefix, and the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS.
Preferably, the symbol that 2 Cyclic Prefix are 160Ts is arranged in UpPTS and specifically comprises by first module: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP1)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol that 2 Cyclic Prefix are 160Ts is arranged in GP and specifically comprises by second unit: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 2, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-(N+M) × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1,2; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol that 2 Cyclic Prefix are 160Ts by Unit the 3rd is arranged in GP, the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP1)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol that 1 Cyclic Prefix is 160Ts by Unit the 3rd is arranged in GP, the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses cyclic prefix CP 3=CP1+ (CP1-CP2)/2, the circulating prefix-length of the upper all symbols of DwPTS is all CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP3)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
The synchronization channel transmission method of the above embodiment of the present invention and device are because the reasonable design structure of synchronizing channel, so overcome two class duplex system structures in prior art do not mate the problem of the S-SCH timing ambiguities caused, and then the initial search process of dual-mode can be simplified, and simplify the effect to DwPTS time slot processing procedure.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the frame structure of LTE system tdd mode;
Fig. 2 is the structural representation of synchronizing channel under tdd mode and fdd mode in existing LTE system;
Fig. 3 shows the flow chart of the synchronization channel transmission method according to the embodiment of the present invention;
Fig. 4 shows the block diagram of the synchronizing channel dispensing device according to the embodiment of the present invention;
Fig. 5 is the synchronous channel structure and the frame structure design schematic diagram that comprise the embodiment of the present invention;
Fig. 6 is that another comprises synchronous channel structure and the frame structure design schematic diagram of the embodiment of the present invention;
Fig. 7 is that another comprises synchronous channel structure and the frame structure design schematic diagram of the embodiment of the present invention;
Fig. 8 is that another comprises synchronous channel structure and the frame structure design schematic diagram of the embodiment of the present invention;
Fig. 9 is that another comprises synchronous channel structure and the frame structure design schematic diagram of the embodiment of the present invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 3 shows the flow chart of the synchronization channel transmission method according to the embodiment of the present invention, comprises the following steps:
Step S10, be arranged on by the primary synchronization channel in synchronizing channel in first OFDM symbol of DwPTS, its circulating prefix-length is 144Ts; And
Step S20, arranges UpPTS and GP, to make the Cyclic Prefix of each symbol on DwPTS identical.
For the tdd mode of existing LTE system, the time that its 3 special time slots continue is 1ms, corresponding 30720Ts, and the duration of each time slot is 0.5ms, the length of the Cyclic Prefix that each time slot first symbol is corresponding is 160Ts, and the circulating prefix-length that all the other symbols are corresponding is 144Ts.And the synchronization channel transmission method of the present embodiment is because the reasonable design structure of synchronizing channel, so overcome two class duplex system structures in prior art do not mate the problem of the S-SCH timing ambiguities caused, and then the initial search process of dual-mode can be simplified, and simplify the effect to DwPTS time slot processing procedure.
In addition, about the allocation problem of three special time slots, in the prior art, some typically configure is that UpPTS at most only accounts for last 2 symbols, and remaining is configured to DwPTS and GP.As can be seen from Figure 2, due in the 1ms that three special time slots are lasting, the CP length always having the CP length of two symbols and other symbols is inconsistent, and the situation that the CP of the CP of certain OFDM symbol and other OFDM symbol is inconsistent just likely appears in the OFDM symbol therefore in DwPTS time slot.This also can bring unnecessary trouble to the demodulation of DwPTS.Obviously, the appropriate design of above-described embodiment also overcomes this problem.
Preferably, arrange UpPTS and GP, to make, the Cyclic Prefix of each symbol on DwPTS is identical specifically to be comprised: the symbol being 160Ts by 2 Cyclic Prefix is arranged in UpPTS; Or the symbol being 160Ts by 2 Cyclic Prefix is arranged in GP; Or the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS; Or the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS.
Preferably, the symbol being 160Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP1)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol being 160Ts by 2 Cyclic Prefix is arranged in GP and specifically comprises: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 2, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-(N+M) × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1,2; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP1)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses cyclic prefix CP 3=CP1+ (CP1-CP2)/2, the circulating prefix-length of the upper all symbols of DwPTS is all CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP3)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Fig. 4 shows the block diagram of the synchronizing channel dispensing device according to the embodiment of the present invention, comprising:
First module 10, for being arranged on by the primary synchronization channel in synchronizing channel in first OFDM symbol of DwPTS, its circulating prefix-length is 144Ts; And
Second module 20, for arranging UpPTS and GP, to make the Cyclic Prefix of each symbol on DwPTS identical.
The synchronizing channel dispensing device of this embodiment is because the reasonable design structure of synchronizing channel, so overcome two class duplex system structures in prior art do not mate the problem of the S-SCH timing ambiguities caused, and then the initial search process of dual-mode can be simplified, and simplify the effect to DwPTS time slot processing procedure.
Preferably, the second module specifically comprises at least one unit following: first module, is arranged in UpPTS for the symbol being 160Ts by 2 Cyclic Prefix; Second unit, is arranged in GP for the symbol being 160Ts by 2 Cyclic Prefix; Unit the 3rd, is arranged in GP for the symbol being 160Ts by 1 Cyclic Prefix, and the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS; Unit the 3rd, is arranged in GP for the symbol being 160Ts by 1 Cyclic Prefix, and the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS.
Preferably, the symbol that 2 Cyclic Prefix are 160Ts is arranged in UpPTS and specifically comprises by first module: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP1)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1,2; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol that 2 Cyclic Prefix are 160Ts is arranged in GP and specifically comprises by second unit: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 2, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-(N+M) × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1,2; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Preferably, the symbol that 1 Cyclic Prefix is 160Ts by Unit the 3rd is arranged in GP, the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP1)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=1; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol
Preferably, the symbol that 1 Cyclic Prefix is 160Ts by Unit the 4th is arranged in GP, the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises: UpPTS uses cyclic prefix CP 3=CP1+ (CP1-CP2)/2, the circulating prefix-length of the upper all symbols of DwPTS is all CP2, and at this moment the length of GP is: T
gP=30720Ts-M × (T
symbol+ CP3)-N × (T
symbol+ CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
Easy for describing, suppose that the length of 1ms correspondence 30720%, DwPTS is N number of symbol (2≤N≤12) here, be designated as CP1 when the length of Cyclic Prefix is 160Ts, be designated as CP2 when the length of Cyclic Prefix is 144Ts, the length of each OFDM symbol is designated as T
symbol.
Under above hypothesis, the corresponding following embodiment of configuration concrete in special time slot.
Embodiment one
Fig. 5 gives the synchronous channel structure and frame structure design schematic diagram that comprise the embodiment of the present invention.As shown in the figure, the length of UpPTS is 1 symbol, and the length of its corresponding Cyclic Prefix is the circulating prefix-length of all symbols of CP1, DwPTS is all CP2, and now the length of corresponding GP is:
T
GP＝30720Ts-(T
symbol+CP1)-N×(T
symbol+CP2)。
Embodiment two
Fig. 6 gives the synchronous channel structure and frame structure design schematic diagram that comprise the embodiment of the present invention.As shown in the figure, the length of UpPTS is 1 symbol, and the length of its corresponding Cyclic Prefix is the circulating prefix-length of all symbols of CP2, DwPTS is all CP2, and now the length of corresponding GP is:
T
GP＝30720Ts-(N+1)×(T
symbol+CP2)。
Embodiment three
Fig. 7 gives the synchronous channel structure and frame structure design schematic diagram that comprise the embodiment of the present invention.As shown in the figure, the length of UpPTS is 2 symbols, and the length of its corresponding Cyclic Prefix is the circulating prefix-length of all symbols of CP1, DwPTS is all CP2, and now the length of corresponding GP is:
T
GP＝30720Ts-2×(T
symbol+CP1)-N×(T
symbol+CP2)。
Embodiment four
Fig. 8 gives the synchronous channel structure and frame structure design schematic diagram that comprise the embodiment of the present invention.As shown in the figure, the length of UpPTS is 2 symbols, and the length of its corresponding Cyclic Prefix is the circulating prefix-length of all symbols of CP2, DwPTS is all CP2, and now the length of corresponding GP is:
T
GP＝30720Ts-(N+2)×(T
symbol+CP2)。
Embodiment five
Fig. 9 gives the synchronous channel structure and frame structure design schematic diagram that comprise the embodiment of the present invention.As shown in the figure, the length of UpPTS is 2 symbols, and the length of its corresponding Cyclic Prefix is the circulating prefix-length of CP3=CP1+ (CP1-CP2)/2, DwPTS all symbols is all CP2, and now the length of corresponding GP is:
T
GP＝30720Ts-2×(T
symbol+CP3)-N×(T
symbol+CP2)。
From above description, can find out, the synchronization channel transmission method adopting the present invention to propose and device, obtain a kind of new frame structure design, the dual-mode become with place system has nothing to do by the initial cell search procedure of UE, the timing relationship of P-SCH and S-SCH is fixed, and to solve in existing synchronization channel transmission method S-SCH for timing ambiguities problem under different system dual-modes.Another principal character of the above embodiment of the present invention is, on DwPTS time slot, the circulating prefix-length of all symbols is all the same, and this can simplify the processing procedure of DwPTS time slot.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. for a synchronization channel transmission method for tdd systems, it is characterized in that, comprise the following steps:
Be arranged on by primary synchronization channel in synchronizing channel in first OFDM symbol of DwPTS, its circulating prefix-length is 144Ts; And
UpPTS and GP is set, to make the Cyclic Prefix of each symbol on DwPTS identical;
Wherein, arrange UpPTS and GP, to make, the Cyclic Prefix of each symbol on DwPTS is identical to be comprised:
The symbol being 160Ts by 2 Cyclic Prefix is arranged in UpPTS; Or
The symbol being 160Ts by 2 Cyclic Prefix is arranged in GP; Or
The symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, and the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS; Or
The symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, and the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS.
2. synchronization channel transmission method according to claim 1, is characterized in that, the symbol being 160Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises:
UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is:
T
GP＝30720Ts-M×(T
symbol+CP1)-N×(T
symbol+CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
3. synchronization channel transmission method according to claim 1, is characterized in that, the symbol being 160Ts by 2 Cyclic Prefix is arranged in GP and specifically comprises:
UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 2, DwPTS to be CP2, and at this moment the length of GP is:
T
GP＝30720Ts-(N+M)×(T
symbol+CP2)
Wherein, the length of UpPTS is M symbol, M=1,2; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
4. synchronization channel transmission method according to claim 1, is characterized in that, the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, and the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS and specifically comprises:
UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is:
T
GP＝30720Ts-M×(T
symbol+CP1)-N×(T
symbol+CP2)
Wherein, the length of UpPTS is M symbol, M=1; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
5. synchronization channel transmission method according to claim 1, is characterized in that, the symbol being 160Ts by 1 Cyclic Prefix is arranged in GP, and the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises:
UpPTS uses the circulating prefix-length of cyclic prefix CP 3=CP1+ (CP1-CP2)/2, DwPTS upper all symbols to be CP2, and at this moment the length of GP is:
T
GP＝30720Ts-M×(T
symbol+CP3)-N×(T
symbol+CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
6., for a synchronizing channel dispensing device for TDD system, it is characterized in that, comprising:
First module, for being arranged on by the primary synchronization channel in synchronizing channel in first OFDM symbol of DwPTS, its circulating prefix-length is 144Ts; And
Second module, for arranging UpPTS and GP, to make the Cyclic Prefix of each symbol on DwPTS identical;
Wherein, described second module comprises at least one unit following:
First module, is arranged in UpPTS for the symbol being 160Ts by 2 Cyclic Prefix;
Second unit, is arranged in GP for the symbol being 160Ts by 2 Cyclic Prefix;
Unit the 3rd, is arranged in GP for the symbol being 160Ts by 1 Cyclic Prefix, and the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS;
Unit the 4th, is arranged in GP for the symbol being 160Ts by 1 Cyclic Prefix, and the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS.
7. synchronizing channel dispensing device according to claim 6, is characterized in that, the symbol that 2 Cyclic Prefix are 160Ts is arranged in UpPTS and specifically comprises by first module:
UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is:
T
GP＝30720Ts-M×(T
symbol+CP1)-N×(T
symbol+CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
8. synchronizing channel dispensing device according to claim 6, is characterized in that, the symbol that 2 Cyclic Prefix are 160Ts is arranged in GP and specifically comprises by second unit:
UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 2, DwPTS to be CP2, and at this moment the length of GP is:
T
GP＝30720Ts-(N+M)×(T
symbol+CP2)
Wherein, the length of UpPTS is M symbol, M=1,2; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
9. synchronizing channel dispensing device according to claim 6, is characterized in that, the symbol that 1 Cyclic Prefix is 160Ts by Unit the 3rd is arranged in GP, and the symbol being 160Ts by 1 Cyclic Prefix is arranged in UpPTS and specifically comprises:
UpPTS uses the circulating prefix-length of the upper all symbols of cyclic prefix CP 1, DwPTS to be CP2, and at this moment the length of GP is:
T
GP＝30720Ts-M×(T
symbol+CP1)-N×(T
symbol+CP2)
Wherein, the length of UpPTS is M symbol, M=1; The length of DwPTS is N number of symbol, 2≤N≤12; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
10. synchronizing channel dispensing device according to claim 6, is characterized in that, the symbol that 1 Cyclic Prefix is 160Ts by Unit the 4th is arranged in GP, and the symbol being 152Ts by 2 Cyclic Prefix is arranged in UpPTS and specifically comprises:
UpPTS uses the circulating prefix-length of cyclic prefix CP 3=CP1+ (CP1-CP2)/2, DwPTS upper all symbols to be CP2, and at this moment the length of GP is:
T
GP＝30720Ts-M×(T
symbol+CP3)-N×(T
symbol+CP2)
Wherein, the length of UpPTS is M symbol, M=2; The length of DwPTS is N number of symbol, 2≤N≤11; CP1 represents that length is the Cyclic Prefix of 160Ts; CP2 represents that length is the Cyclic Prefix of 144Ts; The length of each OFDM symbol is T
symbol.
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|---|---|---|---|
| CN200810001078.XA CN101217308B (en) | 2008-01-18 | 2008-01-18 | For synchronization channel transmission method and the device of tdd systems |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810001078.XA CN101217308B (en) | 2008-01-18 | 2008-01-18 | For synchronization channel transmission method and the device of tdd systems |
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| CN101217308B true CN101217308B (en) | 2015-09-16 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101084695A (en) * | 2004-11-02 | 2007-12-05 | 北电网络有限公司 | Systems and methods for use with orthogonal frequency division multiplexing |
| CN101425888A (en) * | 2007-11-02 | 2009-05-06 | 北京三星通信技术研究有限公司 | Device and method for synchronous signal transmission |
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2008
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101084695A (en) * | 2004-11-02 | 2007-12-05 | 北电网络有限公司 | Systems and methods for use with orthogonal frequency division multiplexing |
| CN101425888A (en) * | 2007-11-02 | 2009-05-06 | 北京三星通信技术研究有限公司 | Device and method for synchronous signal transmission |
Non-Patent Citations (1)
| Title |
|---|
| Samsung, China Mobile.CP length of P-SCH for LTE Type 2.《3GPP TSG RAN WG1 Meeting #51bis,R1-080039》.2008, * |
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