CN103874188A - Downlink synchronization channel and methods for cellular systems - Google Patents
Downlink synchronization channel and methods for cellular systems Download PDFInfo
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- CN103874188A CN103874188A CN201410108050.1A CN201410108050A CN103874188A CN 103874188 A CN103874188 A CN 103874188A CN 201410108050 A CN201410108050 A CN 201410108050A CN 103874188 A CN103874188 A CN 103874188A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
Abstract
The present invention provides a method of operating a base station transmitter. The method includes providing a cellular downlink synchronization signal having primary and secondary portions, wherein the primary portion employs a corresponding one of a plurality of different primary signals allocated to adjoining transmission cells. The method also includes further providing cell- specific information in the secondary portion and transmitting the cellular downlink synchronization signal. In one embodiment, the primary portion explicitly indicates a partial cell identification information and the remaining cell identification information is carried in the secondary portion. In another embodiment, the plurality of different primary signals are simply used to avoid the channel mismatch effect. The present invention also provides a method of operating user equipment. The method includes receiving a cellular downlink synchronization signal having primary and secondary portions wherein the timing acquisition is performed in conjunction with the primary synchronization sequence index detection via the primary portion. In addition, the secondary portion provides cell-specific parameters and identifying and extracting the secondary portion.
Description
The application is the divisional application that is called the Chinese patent application 200780014079.1 of " method of downlink synchronization channel and cellular system " in the name that on April 20th, 2007 submits to.
Technical field
The present invention is usually intended to radio communication, and is more specifically intended to transmitter and receiver, the method for operate transmitters and receiver, and adopt the cellular communication system of this transmitter, receiver and the method.
Background technology
In cellular network, such as the network that adopts OFDM (OFDM) or OFDM (OFDMA), employing base station, each community, communicates by letter with the subscriber equipment (as cell phone, laptop or PDA) that is dynamically positioned at this community in this base station.In the time that opening first, subscriber equipment must carry out search of initial zone, to be connected to cellular network.This relates to the downlink synchronization process between base station and subscriber equipment, and wherein base station sends synchronization signal to subscriber equipment.Synchronization signal is conventionally called synchronization preamble or in 3GPP WCDMA/HSDPA, is called synchronization channel (SCH) in IEEE802.16e.
In search of initial zone, subscriber equipment is set up sequential and frequency offset parameters.Sequential relates to the understanding sampling that starts to synchronized frame and associated symbol where.Frequency shift (FS) relates to judgement and controls the mismatch between local oscillator in basestation oscillator and subscriber equipment.
According to the quality of local oscillator, frequency shift (FS) may greatly and require considerable search time and extra algorithm to adapt to.If subscriber equipment moves with automobile or train speed, this impact can aggravate.Except sequential and frequency consideration, also must obtain some to the specific information in initial cell, as physical area identity (community ID).Because downlink synchronization relates to several operations, the design of downlink synchronization and process should attempt to minimize Receiver Complexity and required time of Cell searching.Reduce complexity for auxiliary, synchronization signal can be made up of two parts: main synchronization (primary synchronization) signal and secondary synchronization (secondary synchronization) signal.Main signal is normally for sequential and frequency collection, and secondary signal is generally used for gathering community ID and other cell-specific information.Different from secondary signal, main synchronization signal is all identical to all communities conventionally.Main synchronization signal is carried main synchronization sequence.In order to ensure excellent properties, master sync signal is for obtaining the necessary channel estimating of decoding secondary signal small area customizing messages through relevant detection.
Along with mobile subscriber equipment approaches two cell boarders between abutting subdistrict, this user's mobile device is carried out neighbor cell search, to prepare, its activity is switched to neighbor cell from initial cell.Now, subscriber equipment receives information from two or more base stations.In the time that base station adopts common primary sequence, between the channel that the specific transmission in this shared signal Hui Shi community is experienced and the main signal for subscriber equipment transmitting, produce mismatch.This mismatch is to the terminal especially severe at cell edge, and at cell edge place, each terminal receives two equal strong and overlapping channels from two significant base stations.With the sequential logic mismatch sharing between channel and the cell-specific data transmission that associated another problem of main syncul sequence is chief series experience.In this case, the sequential obtaining from chief series can cause performance degradation in the time being used for demodulation cell-specific data transmission.This phenomenon occurs especially in strict synchronization network, and as the network of the U.S. and Japan's employing, for the medium of large radius of society, this phenomenon is more and more common.In addition, advanced cellular OFDM system, as 3GPP E-UTRA(strengthens the access of UMTS terrestrial wireless) or Long Term Evolution (Long-term Evolution(LTE)) being adapted to the multimedia broadcasting of enhancing and the Single Frequency Network (SFN) that multicast system (E-MBMS) uses, these system heights depend on Network Synchronization.But this phenomenon is also relevant to search of initial zone, and be a problem especially for neighbor cell search, this is because for neighbor cell search, operation signal to noise ratio (snr) is quite low.This performance reduction causes the Cell searching time of more growing, and this can cause higher signal interruption probability in the time switching.
Therefore the mode that, this area need to strengthen realizes initial and neighbor cell search.
Summary of the invention
In order to solve above-mentioned this area defect, the invention provides base station transmitter to use together with ofdma communication system with OFDM.Base station transmitter comprises synchronous unit, it is configured to provide the cellular downlink synchronization signal with main portion and time part, wherein main portion adopts in the multiple different synchronization signal (or main syncul sequence) of distributing to different transmittings community corresponding one, and inferior part provides cell-specific information.Base station transmitter also comprises the transmitter unit that is configured to launch cellular downlink synchronization signal.In one embodiment, main synchronization codes group is used for representing part community id information, thereby reduces the community id information amount that need to be carried by inferior part.In another embodiment, the main synchronization codes of this group is not carried any community id information.
The present invention also provides subscriber equipment receiver to use together with OFDM or ofdma communication system.In one embodiment, subscriber equipment receiver comprises the receiving element that is configured to receive cellular downlink synchronization signal, and this cellular downlink synchronization signal has main portion and time part, and wherein time part provides specific cell parameter.In addition, subscriber equipment receiver also comprises processing unit, and it is configured to identify and extracts time part.
In another embodiment, the method comprises provides the cellular downlink synchronization signal with main synchronization signal and secondary signal, and wherein main portion adopts in the main synchronization signal of multiple differences (or main syncul sequence) of distributing to contiguous transmitting community corresponding one.The method is also included within time part and information of specific cell is further provided and launches cellular downlink synchronization signal.
The present invention also provides the method for the subscriber equipment receiver that operation uses together with OFDM or ofdma communication system.The method comprises reception cellular downlink synchronization signal, and it has main portion and time part, and wherein time part provides specific cell parameter, identifies and extract time part.
In one aspect of the method, the present invention also provides cellular communication system.Cellular communication system comprises the manager and center cellular transmitter (centric cellular transmitter) that the cellular downlink synchronization signal that adopt a main syncul sequence be provided of one group of main syncul sequence of distribution to multiple communities.Cellular communication system also comprises multiple contiguous cellular transmitters, it provides (multiple) cellular downlink synchronization signal with corresponding (multiple) main syncul sequence, and this corresponding (multiple) main syncul sequence can be distinguished with a described main syncul sequence.
Summarized above the present invention preferably with replaceable feature so that those skilled in the art can understand detailed description of the present invention below better.Additional features of the present invention will illustrate below, the theme of its formation the claims in the present invention.It will be appreciated by those skilled in the art that they can be easy to use concept disclosed herein and specific embodiment as design or revise for carrying out and the basis of other structures of the identical object of the present invention.Those skilled in the art also will recognize that this class equivalent constructions does not depart from spirit of the present invention and category.
Accompanying drawing explanation
For more complete understanding the present invention, reference is below in conjunction with the description of the drawings, wherein:
Fig. 1 illustrates according to the diagram of the embodiment of the cellular network of principle of the invention structure;
Fig. 2 illustrates containing the exemplary main syncul sequence of multiple communities (3 chief serieses) of the community point of 3 communities (sector) and distributes;
Fig. 3 illustrates containing the exemplary main syncul sequence of multiple communities (7 chief serieses) of the community point of 3 communities (sector) and distributes;
Fig. 4 illustrates containing the exemplary main syncul sequence of multiple communities (3 chief serieses) of the community point of 6 communities (sector) and distributes;
Fig. 5 illustrates that supposition adopts the sequential of 3 main syncul sequence and the receiver operation that main synchronization signal detects;
Fig. 6 illustrates the exemplary 2 step cell search process of utilizing multiple main syncul sequence;
Fig. 7 illustrates the exemplary time domain approach of realizing number by adopting subframe layer (sub-frame-level) migration to increase main synchronization signal;
Fig. 8 illustrates the exemplary time domain approach of realizing number by the main synchronization signal of symbolization layer migration increase;
Fig. 9 illustrates according to the flow chart of the embodiment of the method for principle of the invention executable operations base station transmitter;
Figure 10 illustrates according to the flow chart of the alternative embodiment of the method for principle of the invention executable operations base station transmitter;
Figure 11 illustrates according to the flow chart of the embodiment of the method for principle of the invention executable operations subscriber equipment receiver; And
Figure 12 illustrates the flow chart of carrying out the alternative embodiment of the method for subscriber equipment receiver according to the principle of the invention.
Embodiment
With reference now to Fig. 1,, shown in it, be generally expressed as 100 and according to the diagram of the cellular network embodiment of principle of the invention structure.Cellular network 100 comprises the Cellular Networks with center cellular site and six periphery ground floor cellular site.Central point adopts a center base station BS1, and periphery ground floor point adopts ground floor base station BS 2-BS7, as shown in the figure.Cellular network 100 also comprises user equipment (UE), and it is positioned at central point.Notice that a cellular site can form with multiple communities by one.Yi Ge community is conventionally associated with sector.Therefore term " community " and " sector " that, we use are interchangeable.One " point " represents the collection of cells/sectors associated with same base station.
Center base station BS1 comprises base station transmitter 105, and it has synchronous unit 106 and transmitter unit 107.In one embodiment, synchronous unit 106 is configured to provide cellular downlink synchronization signal, and it has main portion and time part.Inferior part provides for the information of center cell or point (, " community is specific ").Transmitter unit 107 is configured to launch cellular downlink synchronization signal to user equipment (UE).Synchronous unit 106 is also configured to provide cellular downlink synchronization signal, and it has main portion and time part.Main portion adopts N(N>1) in the main synchronization signal of individual difference (main syncul sequence) one, these syncul sequence are distributed to respectively the community shown in Fig. 1.As before, inferior part provides center cell specific information, and transmitter unit 107 is launched cellular downlink synchronization signal to user equipment (UE).
User equipment (UE) comprises the subscriber equipment receiver 110 with receiving element 111 and processing unit 112.Receiving element 111 is configured to receive from base station transmitter 105 main portion and time part of cellular downlink signal.Processing unit 112 is configured to identify and extracts time part, and this can be center cell cell-specific parameters is provided.
Provide main portion and time part of downlink synchronization signal to allow to solve sequential and frequency offset issues before determining cell-specific information.This has reduced the complexity of search of initial zone and user equipment (UE) switch mode.Except community ID, cell-specific information also can comprise other parameters, as frame time sequence information and antenna configuration indicator.The cell-specific information being embedded in time part can be part or all of information.For example, ID relevant information in community can be complete physical district ID or community ID group designator.Another example is exact number or 1 designator of base station transmit antennas, and whether this designator indication base station adopts one or more transmitting antennas.In the time that only partial information is in inferior part transmission, complete information is applied some additive method and is resolved.For example, the number of these transmitting antennas can be in broadcast channel transmitted signal, this broad-band channel after cell search process completes by subscriber equipment demodulation.The part designator of the number of these transmitting antennas also can be used as the transmitting diversity designator (diversity indicator) of broadcast channel.
It is to carry some part cell-specific information that of N different main syncul sequence may apply, as part community ID.In this case, network should adopt the main syncul sequence (n=N) of fixed qty.Then physical area id information is split into main synchronization signal and secondary signal.Note, if physical district ID is the synchronization signal (main synchronization signal and secondary signal combination) of not encoding completely, full cell ID should gather by some additive method, as cell-specific downlink pilot tone or reference signal.Obviously,, if physical district ID is the synchronization signal of encoding completely, full cell ID can be through synchronization signal collection.Namely, if there be M different districts ID to be divided into the M/L group of community ID, secondary signal indicating cell ID group (one in M/L possibility), simultaneously in the possibility of ID(L of IDZu Zhong community, main synchronization signal specifies community).In this case, downlink reference signals can be used for the community ID that effect gathers.
Alternatively, no matter when as long as need, the set of N different main syncul sequence can be used to avoid simply the interchannel mismatch of main synchronization signal and secondary signal experience.Namely, network is assigned to utilize the main syncul sequence (1=n=N) of variable number.For example, in asynchronous network, can use a cell-common primary synchronization sequence of selecting from N arrangement set.In strict synchronous network, can use the whole of N sequence or its subset according to cell structure.In this case, main synchronization signal is not used for carrying any cell-specific information, as part community ID, but this cell-specific information can be also can Bu Shi community ID function.Therefore, all or part of community ID of secondary signal portability.If secondary signal is carried part community ID, this means that the application of installation beyond synchronization signal gathers residue community id information.An example is the detection through cell-specific downlink reference signal or pilot tone.Otherwise downlink reference signals can be used to the community ID that effect gathers.
In arbitrary embodiment, main syncul sequence planning can be used to improve the performance of synchronizing network.Thereby the planning of this class is useful, N wants the little decline that minimize terminal complexity increase and potential sequential estimated accuracy.Can how between main synchronization signal and secondary signal, to distribute and different according to physical district ID across the distribution of the N of community main syncul sequence.But, for the second embodiment, do not get rid of the Random assignment of N chief series.
Shown in the embodiment 201 of the exemplary planning of the N of 3 sector hexagonal site main syncul sequence/be distributed in Fig. 2, wherein N=3.Here,, in 3 sector points, in same point, each cell allocation is with 1 in 3 available sequences.Then on multiple points, repeat this process.In the time that main synchronization signal is carried part community id information, wherein the each community ID of L=3(organizes interior 3 community ID), this embodiment is suitable especially.Particularly, the community ID transmitting in secondary signal organizes between interior 3 community ID and has 1 pair of 1 relation.Although this embodiment is carrying the load that reduces secondary signal in the id information of community, channel mismatch appears at sector borders in same point.This is because the community ID group information that secondary signal is carried is that point is specific, but main synchronization signal is that community is specific.But, note, because the mismatch of the multipath combined effect across base station is relaxed.In addition,, in the time that the community id information of main syncul sequence/signal and secondary signal transmission is associated, this embodiment is suitable.No matter main synchronization signal will be carried community id information (in this situation, part community id information is unnecessary) or not carry, and this point is all set up.Fig. 2 201 in explanation show only 3 cellular site.This method of salary distribution repeats whole network, as the representative network being made up of a large amount of cellular site.
Shown in the embodiment 202 of another exemplary planning of the N of 3 sector hexagonal site main syncul sequence/be distributed in Fig. 2, wherein N=3.This embodiment has described and has used some specific primary synchronization sequence, and wherein same sequence is for different sectors in same point.This does not carry any community id information in main synchronization signal, and secondary signal is point specific (be community ID group be point specific), and residue community ID hypothesis is suitable especially should resolve by cell-specific downlink reference signal or pilot tone time.In this case, the multipath channel that main synchronization signal and secondary signal are seen is identical.In Fig. 2,202 explanation illustrates only 3 cellular site.This method of salary distribution repeats on whole network, as the representative network being made up of a large amount of cellular site.
The situation that expands to N=7 that embodiment is exemplary is above shown in Figure 3.Although can be to avoid at N=3 because the multipath of the ground floor point across main synchronization signal combines the channel mismatch causing, there is the multipath combination across second layer point.Can avoid when the N=7 across the multipath combination of first and second layers of point.7 cellular site only shown in Fig. 3.This method of salary distribution repeats on whole network, as the representative network being made up of a large amount of cellular site.
Shown in Figure 4 for an exemplary planning of the N of 6 sector hexagonal site main syncul sequence/distribute, wherein N=3.In this situation, 3 main syncul sequence are distributed across sectors/cells simply, thereby avoid any adjacent cell associated with different base station to use same main syncul sequence.In Fig. 4,201 explanation illustrates only 3 cellular site.This method of salary distribution repeats on whole network, as the representative network being made up of a large amount of cellular site.
How embodiment is used for promoting the example of faster Cell searching as multiple main syncul sequence above.To those skilled in the art, other variations are also possible.
The solution suggestion proposing adopts the receiver shown in Fig. 5 to realize, and sequential and primary sequence index are joint-detection here.Here, " index " be only sequence indication (index n represents n chief series, wherein n=1,2 ..., N).Namely, the each association in the signal receiving an and N candidate sequence (N=3 in Fig. 5 for illustrative purposes).Comparing after N associated overview (correlation profiles) sequential of peak value indicating correct and main synchronization sequence index.In order to reduce receiver complexity, the further optimization of receiver operation remains possible.By utilizing the inherent structure of sequence, can more effectively carry out relevant.For example, when sequence in time domain, be bi-values+1, when-1}, only want realistic addition (real addition).In the time that the signal receiving is relevant to sequence symbol, also can be correlated with by DO symbol.And the subset of N sequence can be shared some public keys or structure, they can be used to further reduce complexity.
Relevant to chief series design, N main syncul sequence can define in time domain or frequency domain.Although defined nucleotide sequence is more natural to the system based on OFDM/OFDMA in frequency domain, in time domain, defined nucleotide sequence can provide better correlation properties and Receiver Complexity to reduce.Conventionally sequence is selected to and has good auto-correlation and crosscorrelation characteristic.Some example is permanent zero auto-correlation (CAZAC), as Zadoff-Chu sequence, and Golay sequence, and Walsh-Hadamard sequence.
Utilize the exemplary cell search procedure of multiple main syncul sequence to illustrate in Fig. 6.Suppose that secondary signal carries community ID group, and main synchronization signal indication Zu Nei community ID.The first step 601 is utilized main synchronization signal and is made up of symbol sequential and primary sequence index detection, as the explanation in earlier paragraphs.Primary sequence index is corresponding to IDZu Nei community, community ID.For search of initial zone, also estimate frequency shift (FS).Frequency offset estimation searches for not necessarily for neighbor cell, because normally frequency-synchronized of base station in network.Whether successful for determining step 1, use test standard.If step 1 is that successfully receiver enters into step 2.Otherwise step 1 repeats and multiple events average/cumulative be can be used to improve successful probability.Second step 602 utilizes secondary signal and intends to gather community ID group.In this example, frame sequential and transmitting diversity designator also detect in second step Cell searching.Note the information type of carrying according to precision architecture and synchronization signal, cell search process difference.
As mentioned above, should to keep minimum be mainly the impact in order to minimize terminal complexity to the number of main syncul sequence.But, conventionally need to increase the possible number that main synchronization signal realizes, thereby because it provides the flexibility of planning and deployment to avoid channel mismatch impact in asynchronous network.For the number that the main synchronization signal that doubles realizes, can use frequency domain or time domain approach.Frequency domain method distribution portion synchronization signal bandwidth realizes to the particular primary synchronization signal that is similar to frequency recycling.But this also causes the increase of complexity.On the other hand, time domain approach is equivalent to cross over the position of the main synchronization signal in a radio frames of different districts change.Different districts may be (multiple) community (Dian Nei community) associated with difference (Dian Jian community) in same point.For the individual different time migration of N ' and N sequence, the individual synchronization signal of NxN ' realizes available altogether.The subset of these realizations or all can be used in network.Time domain approach does not increase terminal complexity, because it is transparent to terminal.
About time domain approach, two different embodiment are possible.First embodiment is shown in Figure 7, and wherein subframe layer (sub-frame-level) migration is used to increase the number that main synchronization signal realizes.As an example, suppose that 1 radio frame is made up of 10 subframes, and 2 subframes are used to carry synchronization signal.N '=2,3 and 5 illustrate in the drawings.The second embodiment is shown in Figure 8, and wherein symbol layer migration is used to increase the number that main synchronization signal realizes.In this case, carry the subframe of synchronization signal and fix, but the position of described subframe inter-sync signal is changed.The example scenario of 5 migrations provides in Fig. 8 altogether, and wherein main synchronization signal and secondary signal are located adjacent one another.But another possible embodiment is the circulation migration (circular shift) of the main syncul sequence of application.
With reference now to Fig. 9,, shown in it, according to the flow chart of an embodiment of principle of the invention operation base station transmitter method, be typically expressed as 900.The method is from step 901.Then in step 902, provide the cellular downlink synchronization signal with main portion and time part.Main portion adopts in the main synchronization signal of multiple differences of distributing to contiguous transmitting community corresponding one.In step 903, cell-specific information further provides in inferior part.Cell-specific parameters at least comprises cell identification information.Other cell-specific parameters can comprise radio frame sequential and antenna configuration indicator.Cellular downlink synchronization signal is launched in step 904, and method 900 finishes in step 905.
With reference now to Figure 10,, shown in it, according to the flow chart of the alternative embodiment of principle of the invention operation base station transmitter method, be typically expressed as 1000.The method 1000 is from step 1001.Then in step 1002, provide the cellular downlink synchronization signal with main portion and time part.Main portion adopts in the main synchronization signal of multiple differences of distributing to contiguous transmitting community corresponding one.In addition the selection indicating section cell identification information of main synchronization signal.In step 1003, residue cell identification information and some other cell-specific parameters, as radio frame sequential and antenna configuration indicator further provide in inferior part.Cellular downlink synchronization signal is launched in step 1004, and method 1000 finishes in step 1005.
With reference now to 11,, the embodiment flow chart of the method for the operation subscriber equipment receiver of carrying out according to the principle of the invention shown in it, is generally expressed as 1100.Method 110, from step 1101, then receives the cellular downlink synchronization signal with main portion and time part in step 1102.Main portion adopts in the main synchronization signal of multiple differences of distributing to contiguous transmitting community.The main portion of this cellular downlink synchronization signal is used to carry out sequential collection, and in step 1103, detects the index of main syncul sequence.In addition, Frequency offset estimation and correction are also performed.Sequential collection be by multiple copies of associated main portion and multiple difference main synchronization signal corresponding one carry out.Once sequential and Frequency Locking are set up in step 1103, time part is identified and extracts in step 1104.In step 1105, then inferior part is used to provide cell-specific parameters.The specific parameter in community is to judge by time part of demodulation code cellular downlink synchronization signal.Cell-specific parameters at least comprises cell identification information.The method 110 finishes in step 1106.
With reference now to Figure 12,, the flow chart of another embodiment of the method for the operation subscriber equipment receiver of carrying out according to the principle of the invention shown in it, is typically expressed as 1200. Step 1201,1202,1203,1204 is identical with the corresponding part of the embodiment 1100 providing in Figure 11 with 1206.Unique difference is step 1205, and cell identification information is from main portion and time part judgement here.Part cell identification information is that main synchronization sequence index after testing obtains from main portion.
The method of this disclosure of the invention can be used for the cellular communication system of any modulation of any employing or multiple access technology, as OFDM/OFDMA, and CDMA or TDMA.This solution is also to any multiplexing scheme, as frequency division multiplexing (FDD) and time division multiplexing (TDD) establishment.
Although method disclosed herein has been described and illustrate with reference to the particular step of carrying out with particular order, be appreciated that these steps are capable of being combined, segmentation, thereby or reset and form equivalent method, and do not depart from the present invention instruction.Therefore, unless particularly point out here, the order of step or grouping do not limit the present invention.
Although described the present invention in detail, those skilled in the art should understand that they can make multiple variation, substitutions and modifications and do not depart from the most wide in range spirit of the present invention and category.
Claims (18)
1. a method that operates base station transmitter, it comprises:
The downlink synchronization signal with main portion and time part is provided, wherein said main portion adopts corresponding in multiple different main signals, wherein said multiple different main signals are associated from multiple different main syncul sequence, and corresponding to part cell identification information, and described part carried residue cell identification information;
Further in described part, provide cell-specific information; And
Launch described cellular downlink synchronization signal,
It is OFDM that wherein said base station transmitter adopts OFDM.
2. method according to claim 1, wherein said cell-specific parameters at least comprises cell identification information and radio frame sequential designator, and wherein said base station transmitter employing OFDM is OFDM.
3. a base station transmitter, it comprises:
Synchronous unit, it is configured to provide the downlink synchronization signal with main portion and time part, wherein said main portion adopts in multiple different main signals corresponding one, wherein said multiple different main signals are associated from multiple different main syncul sequence, and corresponding to part cell identification information, and described part carried residue cell identification information; And
Transmitter unit, it is configured to launch described cellular downlink synchronization signal,
It is OFDM that wherein said base station transmitter adopts OFDM.
4. a subscriber equipment receiver, it comprises:
Receiving element, it is configured to receive the cellular downlink synchronization signal with main portion and time part, wherein said main portion adopts in multiple different main signals, wherein said multiple different main signals are associated from multiple different main syncul sequence, and described part provides cell-specific parameters;
Processing unit, the signal of its associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Processing unit, it is configured to identify and extracts part described time,
It is OFDM that wherein said base station transmitter adopts OFDM.
5. a method that operates subscriber equipment receiver, it comprises:
Reception has the cellular downlink synchronization signal of main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
The signal of associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Identify and extract part described time,
Wherein cell-specific information detects from described part.
6. a method that operates subscriber equipment receiver, it comprises:
Reception has the cellular downlink synchronization signal of main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
The signal of associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Identify and extract part described time,
Wherein cell identity detects from main signal and described the part of the described identification of described downlink synchronization signal.
7. method as claimed in claim 6, the cell identity that wherein cell-specific downlink reference signal detects for effect.
8. a method that operates subscriber equipment receiver, it comprises:
Reception has the cellular downlink synchronization signal of main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
The signal of associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Identify and extract part described time,
Wherein cell identity only detects from described part.
9. a method that operates subscriber equipment receiver, it comprises:
Reception has the cellular downlink synchronization signal of main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
The signal of associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Identify and extract part described time,
Wherein cell identity detects from described inferior part and cell-specific downlink reference signal.
10. a subscriber equipment receiver, it comprises:
Receiving element, it is configured to receive the cellular downlink synchronization signal with main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
Processing unit, the signal of its associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Processing unit, it is configured to identify and extracts part described time,
Wherein cell-specific information detects from described part.
11. 1 kinds of subscriber equipment receivers, it comprises:
Receiving element, it is configured to receive the cellular downlink synchronization signal with main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
Processing unit, the signal of its associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Processing unit, it is configured to identify and extracts part described time,
Wherein cell identity detects from main signal and described the part of the described identification of described downlink synchronization signal.
12. 1 kinds of subscriber equipment receivers, it comprises:
Receiving element, it is configured to receive the cellular downlink synchronization signal with main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
Processing unit, the signal of its associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Processing unit, it is configured to identify and extracts part described time,
The cell identity that wherein cell-specific downlink reference signal detects for verification.
13. 1 kinds of subscriber equipment receivers, it comprises:
Receiving element, it is configured to receive the cellular downlink synchronization signal with main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
Processing unit, the signal of its associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Processing unit, it is configured to identify and extracts part described time,
Wherein cell identity only detects from described part.
14. 1 kinds of subscriber equipment receivers, it comprises:
Receiving element, it is configured to receive the cellular downlink synchronization signal with main portion and time part, wherein said main portion adopts in multiple different main signals, and described time part provides cell-specific parameters, and wherein said multiple different main signals are associated from multiple different main syncul sequence;
Processing unit, the signal of its associated described reception and corresponding at least one in multiple waveforms of described multiple different main signals; And
Processing unit, it is configured to identify and extracts part described time,
Wherein cell identity detects from described inferior part and cell-specific downlink reference signal.
The method of 15. 1 kinds of operation honeycomb communication networks, it comprises:
Can distinguish main synchronization signal by one group and distribute to multiple communities, wherein said main signal is associated from multiple different main syncul sequence;
Cell identity is distributed to described network Zhong community;
The downlink synchronization signal that adopts one of described main synchronization signal is offered to center cell transmitter; And
Further offer multiple contiguous cellular transmitters by having with the downlink synchronization signal of the differentiable corresponding main synchronization signal of one of described main synchronization signal,
Wherein two adjacent cells are assigned with different master sync signals.
The method of 16. 1 kinds of operation honeycomb communication networks, it comprises:
Can distinguish main synchronization signal by one group and distribute to multiple communities, wherein said main signal is associated from multiple different main syncul sequence;
Cell identity is distributed to described network Zhong community;
The downlink synchronization signal that adopts one of described main synchronization signal is offered to center cell transmitter; And
Further offer multiple contiguous cellular transmitters by having with the downlink synchronization signal of the differentiable corresponding main synchronization signal of one of described main synchronization signal,
Wherein single base sites Nei community is assigned with shared master sync signal, and two neighbor points are assigned different master sync signals.
The method of 17. 1 kinds of operation honeycomb communication networks, it comprises:
Can distinguish main synchronization signal by one group and distribute to multiple communities, wherein said main signal is associated from multiple different main syncul sequence;
Cell identity is distributed to described network Zhong community;
The downlink synchronization signal that adopts one of described main synchronization signal is offered to center cell transmitter; And
Further offer multiple contiguous cellular transmitters by having with the downlink synchronization signal of the differentiable corresponding main synchronization signal of one of described main synchronization signal,
The described master sync signal of wherein distributing to each community is associated with described cell identity.
The method of 18. 1 kinds of operation honeycomb communication networks, it comprises:
Can distinguish main synchronization signal by one group and distribute to multiple communities, wherein said main signal is associated from multiple different main syncul sequence;
Cell identity is distributed to described network Zhong community;
The downlink synchronization signal that adopts one of described main synchronization signal is offered to center cell transmitter; And
Further offer multiple contiguous cellular transmitters by having with the downlink synchronization signal of the differentiable corresponding main synchronization signal of one of described main synchronization signal,
Wherein said master sync signal is across community Random assignment.
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| US11/737,554 | 2007-04-19 | ||
| CNA2007800140791A CN101490978A (en) | 2006-04-20 | 2007-04-20 | Downlink synchronization channel and methods for cellular systems |
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| CN201410108050.1A Active CN103874188B (en) | 2006-04-20 | 2007-04-20 | The method of downlink synchronization channel and cellular system |
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| CN106612502A (en) * | 2015-10-22 | 2017-05-03 | 普天信息技术有限公司 | Physical cell identifier PCI acquiring method and system |
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| US8223625B2 (en) * | 2006-08-23 | 2012-07-17 | Qualcomm, Incorporated | Acquisition in frequency division multiple access systems |
| US7965797B2 (en) | 2007-11-01 | 2011-06-21 | Texas Instruments Incorporated | Method, system and apparatus for generating constant amplitude zero autocorrelation sequences |
| CA2713854C (en) * | 2008-02-04 | 2014-06-10 | Sharp Kabushiki Kaisha | Mobile communication system, base station device, mobile station device, and mobile communication method |
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| US5930366A (en) * | 1997-08-29 | 1999-07-27 | Telefonaktiebolaget L M Ericsson | Synchronization to a base station and code acquisition within a spread spectrum communication system |
| DE19916063C1 (en) * | 1999-04-09 | 2000-07-13 | Siemens Ag | Synchronising method for radio communication system |
| US6717930B1 (en) * | 2000-05-22 | 2004-04-06 | Interdigital Technology Corporation | Cell search procedure for time division duplex communication systems using code division multiple access |
| US6385264B1 (en) * | 1999-06-08 | 2002-05-07 | Qualcomm Incorporated | Method and apparatus for mitigating interference between base stations in a wideband CDMA system |
| ATE334561T1 (en) * | 2000-05-10 | 2006-08-15 | Mitsubishi Electric Inf Tech | METHOD FOR ASSIGNING SECONDARY SYNCHRONIZATION CODES TO A BASE STATION OF A MOBILE COMMUNICATIONS SYSTEM |
| US7158505B2 (en) * | 2000-08-04 | 2007-01-02 | Interdigital Technology Corporation | Periodic cell search |
| US6894995B2 (en) * | 2001-06-22 | 2005-05-17 | Interdigital Technology Corporation | Apparatus and method for performing initial cell search in wireless communication systems |
| JP3394530B2 (en) * | 2001-08-07 | 2003-04-07 | 松下電器産業株式会社 | Cell search apparatus and cell search method |
| US6847630B2 (en) * | 2001-11-09 | 2005-01-25 | Qualcomm, Incorporated | Communications in an asynchronous cellular wireless network |
| KR20050076886A (en) * | 2004-01-26 | 2005-07-29 | 삼성전자주식회사 | A method and apparatus of common channel beacon for inter-fa hard handover in w-cdma network |
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- 2007-04-20 CN CN201610875425.6A patent/CN106304318B/en active Active
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612502A (en) * | 2015-10-22 | 2017-05-03 | 普天信息技术有限公司 | Physical cell identifier PCI acquiring method and system |
| CN106612502B (en) * | 2015-10-22 | 2019-11-12 | 普天信息技术有限公司 | A kind of acquisition methods and system of Physical Cell Identifier PCI |
Also Published As
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| KR20090008375A (en) | 2009-01-21 |
| WO2007124451A8 (en) | 2008-10-23 |
| CN106304318B (en) | 2020-02-11 |
| CN103874188B (en) | 2018-03-09 |
| CN106304318A (en) | 2017-01-04 |
| KR101055895B1 (en) | 2011-08-09 |
| WO2007124451A2 (en) | 2007-11-01 |
| WO2007124451A3 (en) | 2008-12-11 |
| EP2014116A2 (en) | 2009-01-14 |
| EP2014116A4 (en) | 2013-10-09 |
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