CN101420402B - Lead code sending method and cell searching method for OFDM system - Google Patents
Lead code sending method and cell searching method for OFDM system Download PDFInfo
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Abstract
The present invention provides a method for transmitting lead code of an orthogonal frequency division multiplexing system and a corresponding cell searching method, wherein the transmitting method comprises the following procedures: transmitting lead code comprising system synchronizing information to a terminal, the lead code comprises main front lead code and auxiliary lead code; modulating the main front lead code on useful subcarrier with fixed bandwidth which is a least bandwidth in the bandwidths used by each coexisting system; transmitting corresponding type of auxiliary lead code by the base station according to the system used in the base station; putting the main lead code in a first orthogonal frequency division multiplexing symbol of each sub-frame and putting the auxiliary lead code in a second orthogonal frequency division multiplexing symbol of each sub-frame by the base station; wherein the main lead code carries the information indicating the style of auxiliary lead code. The method according to the invention causes that the systems with different bandwidths are compatible and that the 802.16m system and 802.16e system are compatible. The terminals with different bandwidths can work to the system with different bandwidth and the access speed of terminal can be increased.
Description
Technical field
The present invention relates to digital communicating field, particularly relate to a kind of lead code sending method and small region search method of ofdm system.
Background technology
As a kind of multi-carrier transmission pattern; OFDM (Orthogonal Frequency Division Multiplex; OFDM) convert one group of low-speed parallel data flow transmitted into through data flow, system is reduced the susceptibility of multidiameter fading channel frequency selectivity greatly a high-speed transfer, and the introducing of Cyclic Prefix; Further strengthened anti-intersymbol interference (the Inter-symbol Interference of system again; ISI) ability, in addition bandwidth availability ratio is high, realize that characteristics such as simple make OFDM more and more wider in the application in radio communication basin, such as; Wlan system; Based on the IEEE 802.16e system of orthogonal frequency division multiplexing multiple access (being called for short 802.16e), and the follow-on evolution IEEE of 802.16e 802.16m system (the 4th generation communication system, be called for short 802.16m) waits and all is based on the technological system of OFDM.
It may be noted that because GSM is a smooth evolution, so, in order to protect benefits of operators, in the regular hour, the 4th generation communication system and 3-G (Generation Three mobile communication system), like 802.16m system and 802.16e system etc., will coexist.
802.16e be to use the agreement of orthogonal frequency division multiplexi; The agreement regulation identifies the beginning of a frame with lead code (preamble); Said lead code is used to supply the terminal to do operations such as frame detection, cell ID (Cell ID) detection, frequency offset estimating and sampling instant estimation; The terminal will be done simultaneous operation earlier when receiving base station information, and will transmit all known signal in two ends at first exactly---and be said lead code.Preamble accounts for a symbol in time; On frequency domain, constitute by subcarrier; The lead code that send the base station has good pseudo random sequence (Pseudo-Noise at frequency domain; Abbreviation PN) character, 114 kinds of specific PN sequences are modulated on the subcarrier with BPSK (two-phase PSK) method as lead code, and whenever modulate the PN sequence of a bit at a distance from 3 number of sub-carrier.
Send on the whole bandwidth of first symbol of down link according to 802.16e standard: preamble, simultaneously, different bandwidth is (like 5MHz; 10MHz; 802.16e system 20MHz) adopts different preamble, and the terminal needs very large amount of calculation for connecting system; And the terminal of different bandwidth is difficult under the system of different bandwidth and works, so prior art has been brought complicacy that realizes and the problem of growing turn-on time.In addition,, therefore also need consider the preamble how the 802.16m system utilizes the 802.16e system to adopt because the 802.16m system needs over a period to come and the 802.16e coexistence of systems, and how with the 802.16e system compatible.
Summary of the invention
The technical problem that the present invention will solve provides a kind of ofdm system lead code sending method and small region search method; Thereby make between the system of various bandwidth, and 802.16m and 802.16e system between can compatibility; Make the mobile terminal UE of different bandwidth can work in the system of different bandwidth, and can improve the access speed of portable terminal.
In order to address the above problem, the invention provides a kind of ofdm system lead code sending method, comprising: the lead code that system synchronous information will be contained in the base station is sent to the terminal; It is characterized in that, also comprise:
Said lead code comprises main lead code and auxilliary lead code;
Said main lead code is modulated on the useful subcarrier of fixed-bandwidth; Said fixed-bandwidth is a bandwidth minimum in each symbiotic system institute dedicated bandwidth;
Corresponding type of auxiliary lead code is sent according to system used in this base station in the base station;
The base station is placed on said main lead code in first OFDM symbol of each subframe, said auxilliary lead code is placed in second OFDM symbol of each subframe; Carry the information of the auxilliary lead code type of indication in the said main lead code.
Further, when 802.16m in the base station and 802.16e coexistence of systems or when only having the 802.16e system, auxilliary lead code is the lead code of 802.16e system; Auxilliary in this case lead code is divided into some types, corresponds respectively to different 802.16e system bandwidths, and all types of auxilliary lead codes is the lead code of the 802.16e system of corresponding bandwidth;
When only having the 802.16m system in the base station, auxilliary in this case lead code has only one type, is served as by the lead code of 802.16m system.
Further, the information that carries the auxilliary lead code type of indication in the said main lead code is meant: total m of said main preamble sequence, and m is total number of auxilliary lead code type in each situation; Each main preamble sequence is respectively applied for the dissimilar auxilliary lead code of indication.
Further, all types of auxilliary preamble sequences is divided into n group, and every group corresponding to a sector, and n is the sector number that the base station comprises, and N auxilliary lead code S-Preamble sequence is arranged in every group, corresponds respectively to different cell IDs; The auxilliary lead code of each sector is modulated on the subcarrier original position of different side-play amounts.
Further, in the system of 802.16m and 802.16e coexistence, pilot field center-aligned before 802.16m lead code and the 802.16e.
Further, carry in broadcast message said 802.16m lead code center.
Further, said main lead code on frequency domain apart from one another by a number of sub-carrier.
The present invention also provides the small region search method at terminal in a kind of ofdm system, it is characterized in that, comprising:
A, terminal from the data that receive, utilize main lead code carry out frame synchronization and OFDM symbol synchronous; Utilize main lead code to carry out frequency offset estimating and compensation;
B, terminal utilize frame synchronization, OFDM symbol synchronizing information, extract first OFDM symbol of each subframe, carry out DFT, extract the information of the auxilliary lead code type of indication in the main lead code;
C, utilize frame synchronization, OFDM symbol synchronization information, extract second OFDM symbol of each subframe, carry out DFT, confirm cell ID according to the data after the conversion.
Further, said step c specifically comprises:
C1, terminal utilize frame synchronization, OFDM symbol synchronization information, extract second OFDM symbolic component of each subframe, carry out DFT, the data after conversion, according to the sub-carrier power size of different side-play amounts, confirm sector mark;
C2, terminal, through the mode of sequences match, can obtain and auxilliary preamble sequence corresponding district sign on the subcarrier of corresponding side-play amount according to the sector mark of confirming.
Further, the information that extracts in the main lead code the auxilliary lead code type of indication among the said step b is meant: each main preamble sequence is corresponding to the auxilliary lead code of a type; After extracting main preamble sequence, confirm auxilliary lead code type according to this sequence.
After having adopted technical scheme of the present invention, can reach following effect:
(1) can support the extensibility of 802.16m system bandwidth, the 802.16m system bandwidth is generally 5MHz-20MHz, and system bandwidth can expand to greater than 20MHz;
(2) support the UE of different bandwidth to insert;
(3) ability backward compatibility 802.16e system promptly supports the lead code that the 802.16e system adopts;
(4) in the system of 802.16m and 802.16e coexistence, the lead code that the multiplexing 802.16e of ability system adopts, spectrum efficiency is high.
(5) adopt the lead code of classification to design, so the also corresponding classification of cell search process, search speed is accelerated, thereby shortened turn-on time.
Description of drawings
Preamble sketch map when Fig. 1 coexists for the 802.16e frame of 802.16m frame in the application example of the present invention and 5MHz bandwidth;
Preamble sketch map when Fig. 2 coexists for the 802.16e frame of 802.16m frame in the application example of the present invention and 10MHz bandwidth;
Preamble sketch map when Fig. 3 independently exists for 802.16m frame in the application example of the present invention;
Fig. 4 is the time domain structural representation of the OFDM symbol at P-Preamble place;
Fig. 5 is in the different bandwidth system, the frequency domain position sketch map of leading placement;
Fig. 6 is the flow chart of small region search method in the application example of the present invention.
Embodiment
To combine accompanying drawing and embodiment that technical scheme of the present invention is explained in more detail below.
The invention provides a kind of ofdm system lead code sending method, its core concept is in the lead code design, to adopt classification technique; Said lead code sending method comprises:
The lead code symbol that system synchronous information will be contained in the base station is sent to the terminal, and said lead code comprises main lead code P-Preamble and auxilliary lead code S-preamble; The base station is placed on said P-preamble in first OFDM symbol of each subframe, said S-preamble is placed in second OFDM symbol of each subframe.
Said P-preamble modulates on the useful subcarrier of fixed-bandwidth, and said fixed-bandwidth is bandwidth minimum in each symbiotic system institute dedicated bandwidth, for example 5MHz.Therefore, when the coexistence of systems of various different bandwidths, its P-preamble is consistent, so can well be compatible.Said P-preamble can be served as by the lead code of 802.16e or 802.16m system.
The S-preamble of respective type is sent in each base station according to the situation of this base station; Said S-preamble is divided into I class and II class two big classes from big aspect; Auxilliary lead code when the auxilliary lead code when representing new-old system coexistence (for example 802.16m and 802.16e system) or only haveing been friends in the past system like the I class, II class represent that new system independently exists.In order to improve service efficiency and compatibility, when new-old system coexisted or only has been friends in the past system, S-preamble served as by the lead code of old system; Because have the system of multiple different bandwidth in the old system, so I class S-preamble can be subdivided into some types again, corresponds respectively to different bandwidth, all types of S-preamble is served as by the lead code of the old system of corresponding bandwidth; II class S-preamble is served as by the lead code of 802.16m system as a type; According to preamble, auxilliary lead code can be subdivided into m type altogether.
In P-preamble, carry the information that is used to indicate the S-preamble type, concrete implementation can be:
Total m of said P-preamble sequence if this m sequence is numbered respectively, is sequence number with M, and the sequence number of then said m sequence is respectively M=1,2 ..., m; Different sequences are respectively applied for the dissimilar S-Preamble of indication; Comprise that such as, symbiotic system 802.16m system, bandwidth are three types of the 802.16e system of 5MHz and 802.16e systems that bandwidth is 10MHz, then m is 3; In 3 sequences, M=1 and these two pairing S-Preamble of P-preamble sequence of 2 are that 5MHz and bandwidth are that the lead code of the 802.16e system of 10MHz is served as by bandwidth respectively; The S-Preamble of the P-preamble sequence correspondence of M=3 is served as by the S-Preamble of 802.16m system.In this symbiotic system, when in the base station 802.16m system only being arranged, then adopt the P-preamble sequence of M=3; Same, when in the base station 802.16e system of 802.16m system and 5MHz being arranged simultaneously, then adopt the P-preamble sequence of M=1; Like this, when the terminal receives, the system that just can learn in the current base station to be adopted according to the P-preamble sequence, thus the terminal can be worked in the system of various bandwidth, and access speed is accelerated.
Can find out that P-Preamble and S-Preamble adopt time division multiplexing mode, promptly are arranged in different OFDM symbols; Because P-Preamble is two OFDM symbols that time domain links to each other with S-Preamble, therefore can utilize P-Preamble symbol as a reference, realize the S-Preamble coherent detection, detect performance thereby improve.
Below be preferred version of the present invention:
All types of S-Preamble sequences is divided into n group, and every group corresponding to a sector, and n is the sector number that the base station comprises, and N S-Preamble sequence is arranged in every group, corresponds respectively to different cell IDs, and promptly to add up to N * n individual in the sub-district.Each is organized on the subcarrier original position that S-Preamble is modulated at different side-play amounts; Be that said S-preamble adopts time domain to repeat for n time, promptly frequency domain inserts the S-preamble sequence of a type at a distance from the n-1 number of sub-carrier.The terminal can be adopted when inserting and confirmed the sector mark two-stage way of search of definite cell ID more earlier like this; Such as in n sector, confirming sector mark earlier; Search cell in N cell ID at most only need be carried out n+N search again, then need carry out N * n search during not classification; Obviously after adopting this hierarchical search mode, search speed is accelerated than original.
In the system of 802.16m and 802.16e coexistence, pilot field center-aligned before 802.16m lead code and the 802.16e; Carry in broadcast message the lead code center.
Said P-preamble can but be not limited to adopt time domain to repeat 2 aggregated(particle) structures, corresponding frequency-domain structure be the P-preamble sequence at interval a number of sub-carrier insert.Adopting the time domain repeat property is to design for the simple of P-preamble Sequence Detection, and can adopt cross-correlation test this moment.If there is not the time domain repeat property, must adopt Autocorrelation Detection, latter's algorithm is more complicated than the former.Said P-preamble number of repetition depends on the detection method of employing.
Correspondingly, the present invention also provides the small region search method at terminal in a kind of ofdm system, comprising following steps:
A, terminal utilize the P-Preamble employing to carry out OFDM sign synchronization, frame synchronization; If said P-preamble repeats in time domain, then this step adopts cross-correlation test, otherwise adopts auto-correlation;
B, terminal utilize P-Preamble to carry out frequency offset estimating and compensation;
C, terminal utilize the P-Preamble auto-correlation to carry out synchronously smart and definite this sequence of symbol OFDM; Owing to after each main preamble sequence corresponding to the auxilliary lead code of a type, therefore extracts main preamble sequence, can confirm auxilliary lead code type according to this sequence;
The S-preamble sequence is extracted at D, terminal, realizes that through S-Preamble subcarrier set Sector (sector) detects, and obtains Sector ID (sector mark);
The S-Preamble Sequence Detection is carried out in E, terminal on subcarrier set (group), obtain Cell ID, can but be not limited to adopt coherent detection.
So far, Cell searching is accomplished.
Further explain with two application examples of the present invention below.
In the ofdm system of IEEE 802.16 series, a frame (wireless) is divided into several OFDM symbols, and the length of frame is a prior determined value, and this sentences 5 milliseconds and is example.
Should use in the instance, the coexistence of three type systematics is arranged, be respectively that bandwidth is the 802.16e system of 5MHz and 10MHz, and bandwidth is the 802.16m system of 5MHz.
Because the system type number is 3, i.e. m=3 therefore correspondingly is divided into three with the P-Preamble sequence, and sequence number is represented with M; As shown in table 1; S-Preamble is served as by the preamble of the 802.16e of 5MHz bandwidth during M=1; S-Preamble is served as by the preamble of the 802.16e of 10MHz bandwidth during M=2; And S-Preamble is served as by the preamble sequence of the 802.16m of 5MHz bandwidth during M=3, and the preamble sequence of 802.16m can be the preamble different sequences with 802.16e.
Table 1, P-Preamble sequence and S-Preamble mapping table
Fig. 1 is the preamble sketch map in 802.16e frame when coexistence of 802.16m frame and 5MHz bandwidth; Be existing 802.16m system in the base station this moment, and the 802.16e system of 5MHz bandwidth is arranged again; Say from time domain; Wherein P-Preamble is positioned at first OFDM symbol of every frame; S-Preamble then is positioned at second OFDM symbol of every frame, and this moment, the sequence number of P-Preamble was M=1, and S-Preamble is served as by the preamble of the 802.16e system of 5MHz bandwidth.Say that from the angle of frequency domain P-Preamble modulates on the useful subcarrier of 5MHz bandwidth, and space one number of sub-carrier, such as all in odd subcarriers or all on even subcarriers, modulate, shown in Fig. 1 bend filling part.Said S-Preamble modulates on the useful subcarrier of 5MHz bandwidth, and space two number of sub-carrier.
When S-Preamble is served as by the preamble of the 802.16e of 5MHz bandwidth, have 114 sequences, correspond respectively to 114 cell IDs, be divided into 3 groups; Every group corresponding to a sector, and the S-Preamble of each sector is modulated on the subcarrier original position of different side-play amounts, is modulated at subcarrier 1,4 like sector 1; 7...... on, sector 2 is modulated at subcarrier 2,5, and 8...... is last; Sector 3 is modulated at subcarrier 3,6, and 9...... is last.
Fig. 2 is 802.16e frame when coexistence preamble sketch map of 802.16m frame and 10MHz bandwidth; Say from time domain; Wherein P-Preamble is positioned at first OFDM symbol of every frame; S-Preamble then is positioned at second OFDM symbol of every frame, and is served as by the preamble of the 802.16e of 10MHz bandwidth.This moment, the sequence number of P-Preamble was M=2, and the modulation on subcarrier is identical with Fig. 1, and the grouping of S-Preamble is identical with Fig. 1 with subcarrier modulation modes.
Preamble sketch map when Fig. 3 is 802.16m system individualism; Say from time domain; Wherein P-Preamble is positioned at first symbol of every frame, and S-Preamble then is positioned at second symbol of every frame, and is served as by the S-Preamble sequence of 802.16m system; This moment, the sequence number of P-Preamble was M=3, and the modulation on subcarrier is identical with Fig. 1, and the grouping of S-Preamble is identical with Fig. 1 with subcarrier modulation modes.
Fig. 4 is the time domain structure chart of P-Preamble place OFDM symbol; Because the mode that P-Preamble adopts subcarrier spacing to insert on frequency domain; So; P-Preamble forms the identical two parts in front and back on the time domain in an OFDM symbol, and top CP is a Cyclic Prefix in the OFDM symbol, is used to eliminate the multi-path influence of wireless channel transmission.
Fig. 5 has shown in the different bandwidth system, the possible position of leading placement (frequency domain); Leading to 20MHz bandwidth system 5M bandwidth has 5 positions: be respectively with each vertical line positions aligning on the rectangle of expression 20MHz bandwidth among preamble bandwidth center and the figure; Leading to 20MHz bandwidth system 10M bandwidth has 3 positions: be respectively with each vertical line positions aligning on the rectangle of expression 20MHz bandwidth among preamble bandwidth center and the figure; 5M is leading to the 10MHz bandwidth, and 3 positions are arranged: be respectively with each vertical line positions aligning on the rectangle of expression 20MHz bandwidth among preamble bandwidth center and the figure.Leading that position that is placed on earth in the system, by broadcast broadcasting, portable terminal is confirmed the frequency range at system bandwidth place in view of the above.
Should use in the instance, as shown in Figure 6, at mobile you, the small region search method at terminal comprises the steps:
A, OFDM sign synchronization, frame synchronization, Frequency Synchronization step: synchronizing signal position is confirmed at the terminal from the data that receive---be the P-Preamble character position; Carry out frame synchronization and OFDM sign synchronization simultaneously, can but be not limited to utilize P-Preamble to carry out cross-correlation; Frame synchronization and OFDM sign synchronization belong to mature technology, do not give unnecessary details at this; Sub-frame sync signal has certain specific character usually: characteristics such as time domain symmetry as shown in Figure 4 are very easy to extract.
Carry out Frequency Synchronization, promptly utilize the P-Preamble symbol to do frequency offset estimating and compensation, the frequency offset estimating algorithm is a mature technology, does not give unnecessary details at this.
B, P-Preamble recognition sequence step: adopt auto-correlation to carry out the symbol OFDM essence synchronously; Utilize frame synchronization, OFDM symbol synchronization information; Extract first OFDM symbolic component of each subframe; Carry out DFT, can extract the sequence of P-Preamble sequence the data after conversion, can obtain the type of the S-preamble of sub-district employing.Method for distilling above-mentioned all is a mature technology, does not give unnecessary details at this;
C, Sector ID detect step: utilize frame synchronization, OFDM symbol synchronization information; Extract second OFDM symbolic component of each subframe, carry out DFT, the data after conversion; According to the sub-carrier power size of different side-play amounts, can confirm Sector ID.
D, Cell ID detect step, and according to the Sector ID that confirms, on the subcarrier of the corresponding side-play amount of Cell ID, the mode through sequences match obtains the S-preamble sequence, can obtain the Cell ID corresponding with the S-preamble sequence.On the terminal, store the corresponding relation of each S-preamble sequence and Cell ID; For simply, also can indicate different S-preamble sequences with the S-preamble sequence number, the corresponding relation of storage S-preamble sequence number and CellID gets final product on the terminal.
So far, Cell searching is accomplished.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. ofdm system lead code sending method, comprising: the lead code that system synchronous information will be contained in the base station is sent to the terminal; It is characterized in that, also comprise:
Said lead code comprises main lead code and auxilliary lead code;
Said main lead code is modulated on the useful subcarrier of fixed-bandwidth; Said fixed-bandwidth is a bandwidth minimum in each symbiotic system institute dedicated bandwidth;
Corresponding type of auxiliary lead code is sent according to system used in this base station in the base station;
The base station is placed on said main lead code in first OFDM symbol of each subframe, said auxilliary lead code is placed in second OFDM symbol of each subframe; Carry the information of the auxilliary lead code type of indication in the said main lead code.
2. lead code sending method as claimed in claim 1 is characterized in that:
When 802.16m in the base station and 802.16e coexistence of systems or when only having the 802.16e system, auxilliary lead code is the lead code of 802.16e system; Auxilliary in this case lead code is divided into some types, corresponds respectively to different 802.16e system bandwidths, and all types of auxilliary lead codes is the lead code of the 802.16e system of corresponding bandwidth;
When only having the 802.16m system in the base station, auxilliary in this case lead code has only one type, is served as by the lead code of 802.16m system.
3. lead code sending method as claimed in claim 2 is characterized in that, the information that carries the auxilliary lead code type of indication in the said main lead code is meant: total m of said main preamble sequence, and m is total number of auxilliary lead code type in each situation; Each main preamble sequence is respectively applied for the dissimilar auxilliary lead code of indication.
4. lead code sending method as claimed in claim 1 is characterized in that:
All types of auxilliary preamble sequences is divided into n group, and every group corresponding to a sector, and n is the sector number that the base station comprises, and N auxilliary lead code S-Preamble sequence is arranged in every group, corresponds respectively to different cell IDs; The auxilliary lead code of each sector is modulated on the subcarrier original position of different side-play amounts.
5. lead code sending method as claimed in claim 1 is characterized in that:
In the system of 802.16m and 802.16e coexistence, pilot field center-aligned before 802.16m lead code and the 802.16e.
6. lead code sending method as claimed in claim 5 is characterized in that:
Carry in broadcast message said 802.16m lead code center.
7. lead code sending method as claimed in claim 1 is characterized in that:
Said main lead code on frequency domain apart from one another by a number of sub-carrier.
8. the small region search method at terminal in the ofdm system is characterized in that, comprising:
A, terminal from the data that receive, utilize main lead code carry out frame synchronization and OFDM symbol synchronous; Utilize main lead code to carry out frequency offset estimating and compensation;
B, terminal utilize frame synchronization, OFDM symbol synchronizing information, extract first OFDM symbol of each subframe, carry out DFT, extract the information of the auxilliary lead code type of indication in the main lead code;
C, utilize frame synchronization, OFDM symbol synchronization information, extract second OFDM symbol of each subframe, carry out DFT, confirm cell ID according to the data after the conversion.
9. small region search method as claimed in claim 8 is characterized in that, said step c specifically comprises:
C1, terminal utilize frame synchronization, OFDM symbol synchronization information, extract second OFDM symbolic component of each subframe, carry out DFT, the data after conversion, according to the sub-carrier power size of different side-play amounts, confirm sector mark;
C2, terminal, through the mode of sequences match, can obtain and auxilliary preamble sequence corresponding district sign on the subcarrier of corresponding side-play amount according to the sector mark of confirming.
10. small region search method as claimed in claim 8 is characterized in that, the information that extracts the auxilliary lead code type of indication in the main lead code among the said step b is meant: each main preamble sequence is corresponding to the auxilliary lead code of a type; After extracting main preamble sequence, confirm auxilliary lead code type according to this sequence.
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| CN101483626B (en) * | 2008-01-09 | 2012-11-28 | 中兴通讯股份有限公司 | Sending, receiving, and transmitting method for preamble sequence |
| CN101222467B (en) * | 2008-01-29 | 2010-12-01 | 中兴通讯股份有限公司 | Leading transmission method of orthogonal frequency division multiplexing system |
| CN101938441B (en) * | 2009-06-29 | 2014-05-07 | 中兴通讯股份有限公司南京分公司 | Synchronization sequence sending and receiving methods for realizing synchronous access and corresponding device |
| US8619673B2 (en) * | 2009-07-08 | 2013-12-31 | Mediatek Inc. | Preamble partition and cell identification procedure in wireless communication systems |
| CN102316065B (en) * | 2010-07-09 | 2015-10-21 | 中兴通讯股份有限公司 | Synchronization preamble sending method, synchronous method, Apparatus and system |
| CN105532069A (en) * | 2013-04-28 | 2016-04-27 | 华为技术有限公司 | Physical random access channel access method, equipment and system |
| CN106464627B (en) * | 2014-06-11 | 2020-03-31 | 瑞典爱立信有限公司 | Method of processing preamble sequences, wireless device, preamble receiver, network node and computer-readable storage medium |
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| WO2005112566A2 (en) * | 2004-05-01 | 2005-12-01 | Neocific, Inc. | Methods and apparatus for multi-carrier communications with variable channel bandwidth |
| CN101043640A (en) * | 2006-03-23 | 2007-09-26 | 华为技术有限公司 | Method and system for obtaining wireless resource management information in evolvement network |
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| WO2005112566A2 (en) * | 2004-05-01 | 2005-12-01 | Neocific, Inc. | Methods and apparatus for multi-carrier communications with variable channel bandwidth |
| CN101043640A (en) * | 2006-03-23 | 2007-09-26 | 华为技术有限公司 | Method and system for obtaining wireless resource management information in evolvement network |
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