CN101924724B - Design method and device of synchronization access sequence - Google Patents
Design method and device of synchronization access sequence Download PDFInfo
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- CN101924724B CN101924724B CN200910147560.9A CN200910147560A CN101924724B CN 101924724 B CN101924724 B CN 101924724B CN 200910147560 A CN200910147560 A CN 200910147560A CN 101924724 B CN101924724 B CN 101924724B
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
Abstract
The invention discloses a design method and device of synchronization access sequence. The method comprises the following steps: setting the main synchronization channel bandwidth of the orthogonal frequency division multiplexing system with variable bandwidth to be fixed bandwidth; dropping the secondary synchronization channel of the system with regular bandwidth or the regular bandwidth occupied by the system resource block, obtaining irregular bandwidth; and using different sequences of the main synchronization channel to carry the information of the irregular bandwidth on the set main synchronization channel bandwidth. The invention satisfies the synchronization requirement of the system.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method for designing and device of synchronization access sequence.
Background technology
As a kind of multi-carrier transmission pattern, OFDM (OrthogonalFrequency Division Multiplex, referred to as OFDM) by the data flow of a high-speed transfer being converted to the data flow of one group of low-speed parallel transmission, system is reduced greatly to the susceptibility of multidiameter fading channel frequency selectivity, and the introducing of Cyclic Prefix, further strengthen again the anti-intersymbol interference of system (Inter-symbol Interference, referred to as ISI) ability, in addition bandwidth availability ratio is high, realizing the feature such as simple makes OFDM more and more wider in the application in radio communication basin, such as, WLAN (wireless local area network) (Wireless Local AreaNetwork, referred to as WLAN) system, 802.16e system based on orthogonal frequency division multiplexing multiple access, and the follow-on evolution 802.16m of 802.16e system (the 4th generation communication system) etc. is all the system based on OFDM technology.
Because the wireless communication system based on OFDM technology need to be supported different business demands and the demand of arranging net, for example, voice, wideband data, macro base station, microcell base station, said system adopts the OFDM parameter list of different bandwidth series to meet the system requirements of different bandwidth.For example, for Long Term Evolution (Long-Term Evolution, referred to as LTE) system, bandwidth class is: (a) 5,10,20MHz and the 15MHz that may get; (b) 1.25,1.6 and 2.5MHz, to adapt to the distribution of narrow band spectrum.
But wireless frequency spectrum is scarce resource, along with the continuous growth of people to " content " demand, wireless bandwidth demand is increasing, for example, in the demand of 4G system, maximum bandwidth is 100MHz, and in fact, (for example, 5,10,20MHz) of rule, continuous frequency range are fewer and feweri, how to utilize irregular (for example, 14M, 17.5M) frequency spectrum be need solve problem.
At present, the solution of this problem is mainly contained to frequency spectrum huge profit use, that is, and spectrumrefarming, but the operating process that frequency spectrum huge profit is used is very complicated.
Another kind of feasible method is (tone dropping) technology of throwing away based on OFDM, and tone dropping technology is utilized the distinctive extensibility of OFDM, by adjusting the number of usable subcarriers of ofdm system, to adapt to different irregular bandwidth.
Although tone dropping technology is simple by technology with respect to frequency spectrum huge profit,, need to make change to existing regular bandwidth system.
For example, for the synchronizing process of ofdm system, terminal need to realize by synchronizing channel the testing process of time, Frequency Synchronization and community ID (Cell ID), and the reading of system broadcast message.For regular bandwidth system, because bandwidth series adopts multiple relation conventionally, for example, and 5,10,20, so terminal easily completes synchronously in predefined mode.But for irregular bandwidth system, owing to not there is not this multiple relation, terminal completes synchronously more difficult in predefined mode, also do not have corresponding design to realize the synchronizing process of irregular bandwidth at present.
Summary of the invention
Propose the present invention for also not having at present to design the problem of the synchronizing process that realizes irregular bandwidth accordingly, for this reason, main purpose of the present invention is to provide a kind of design of improved synchronization access sequence, to address the above problem.
According to an aspect of the present invention, provide a kind of method for designing of synchronization access sequence, be applied to bandwidth varying ofdm system.
Comprise according to the method for designing of synchronization access sequence of the present invention: the primary synchronization channel bandwidth that bandwidth varying ofdm system is set is fixed-bandwidth; The regular bandwidth that auxiliary synchronization channel to regular bandwidth system or system resource block take is thrown away, and obtains irregular bandwidth; In the primary synchronization channel bandwidth arranging, utilize the different sequences of primary synchronization channel to carry the information of irregular bandwidth.
Preferably, primary synchronization channel bandwidth being set is that fixed-bandwidth comprises: it is system minimum bandwidth that primary synchronization channel bandwidth is set.
Preferably, regular bandwidth auxiliary synchronization channel or system resource block being taken throw away comprise one of following: regular bandwidth auxiliary synchronization channel or system resource block being taken take synchronizing sequence sub-block as unit is thrown away; Regular bandwidth auxiliary synchronization channel or system resource block being taken take resource mapping subband as unit is thrown away; Regular bandwidth auxiliary synchronization channel or system resource block being taken in conjunction with synchronizing sequence sub-block and resource mapping subband is thrown away; Regular bandwidth auxiliary synchronization channel or system resource block being taken take the common factor of synchronizing sequence sub-block and resource mapping subband as unit is thrown away.
Preferably, the secondary synchronization sequences of irregular bandwidth is less than the secondary synchronization sequences of regular bandwidth.
Preferably, the remainder that the secondary synchronization sequences of irregular bandwidth is thrown away after part piecemeal by the secondary synchronization sequences both sides of regular bandwidth forms, and wherein, the block count of remainder is
W
ifor irregular bandwidth, α is systematic sampling rate, N
subbkfor each piecemeal takies sub-carrier number, df is subcarrier spacing.
Preferably, the system of irregular bandwidth takies sub-carrier resources and takies by the system of regular bandwidth the remainder of throwing away after part subband on sub-carrier resources both sides and form, and wherein, the sub band number of remainder is
W
ifor irregular bandwidth, α is systematic sampling rate, N
subbdfor each subband takies sub-carrier number, df is subcarrier spacing, and the bandwidth that the secondary synchronization sequences of irregular bandwidth takies is less than or equal to system bandwidth.
Preferably, system broadcast channel takies secondary synchronization sequences or the system that sub-carrier resources is irregular bandwidth and takies the bandwidth that sub-carrier resources is occupied.
Preferably, different sequences are used to indicate different bandwidth information and multicarrier information, and wherein, bandwidth information comprises regular bandwidth information and irregular bandwidth information.
Preferably, the irregular bandwidth of different sequences indication comprises one of following: bandwidth, system that secondary synchronization sequences occupies take the bandwidth that sub-carrier resources is occupied.
Preferably, the sequence that is used to indicate irregular bandwidth only indication mechanism is irregular bandwidth system, and concrete bandwidth information is carried out blind Detecting by the piecemeal of secondary synchronization sequences and determined.
Preferably, the sequence that is used to indicate irregular bandwidth is only indicated the bandwidth range of irregular bandwidth system, and concrete bandwidth information is carried out blind Detecting by the piecemeal of secondary synchronization sequences and determined.
A kind of design apparatus of synchronization access sequence is provided according to an aspect of the present invention.
Comprise according to the design apparatus of the design synchronization access sequence of synchronization access sequence of the present invention: module is set, and is fixed-bandwidth for the primary synchronization channel bandwidth of bandwidth varying ofdm system is set; Processing module, the regular bandwidth taking for the auxiliary synchronization channel to regular bandwidth system or system resource block is thrown away, and obtains irregular bandwidth; Carry module, for utilizing the different sequences of primary synchronization channel to carry the information of irregular bandwidth in the primary synchronization channel bandwidth arranging.
By the present invention, the regular bandwidth that auxiliary synchronization channel to regular bandwidth system or system resource block take is thrown away, obtain irregular bandwidth, and utilize the different sequences of primary synchronization channel to carry the information of described irregular bandwidth in the described primary synchronization channel bandwidth arranging, solve and also do not had corresponding design to realize the problem of the synchronizing process of irregular bandwidth at present, and then met the synchronous requirement of system.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the flow chart of the method for designing of the synchronization access sequence of the embodiment of the present invention;
Fig. 2 is according to the schematic diagram of the P-SCH of the embodiment of the present invention and S-SCH;
Fig. 3 is the schematic diagram of the secondary synchronization sequences sub-block of regular bandwidth according to the embodiment of the present invention (5,10,20MHz) 16m system;
Fig. 4 is the sub-block of secondary synchronization sequences and the schematic diagram of resource subband corresponding relation of regular bandwidth according to the embodiment of the present invention (5,10MHz) 16m system;
Fig. 5 is according to the schematic diagram of the sub-block of the secondary synchronization sequences of the 16m system of the irregular bandwidth 7.8906250MHz of the embodiment of the present invention and resource subband corresponding relation;
Fig. 6 is according to the schematic diagram of the sub-block of the secondary synchronization sequences of the 16m system of the irregular bandwidth 7.2MHz of the embodiment of the present invention and resource subband corresponding relation;
Fig. 7 is according to the structured flowchart of the design apparatus of the synchronization access sequence of the embodiment of the present invention.
Embodiment
Functional overview
Consider and also do not have corresponding design to realize the problem of the synchronizing process of irregular bandwidth at present, the embodiment of the present invention provides a kind of design of improved synchronization access sequence, the regular bandwidth that auxiliary synchronization channel to regular bandwidth system or system resource block take is thrown away, obtain irregular bandwidth, and utilize the different sequences of primary synchronization channel to carry the information of irregular bandwidth in the primary synchronization channel bandwidth arranging, by the design of synchronization access sequence of the present invention, there is good bandwidth extensibility, can meet the synchronous requirement of system simultaneously.
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Embodiment of the method
According to embodiments of the invention, a kind of method for designing of synchronization access sequence is provided, be applied to bandwidth varying ofdm system, for the terminal time-frequency domain of classification synchronous channel structure, synchronous and broadcast reads.Fig. 1 is according to the flow chart of the method for designing of the synchronization access sequence of the embodiment of the present invention, and as shown in Figure 1, the method comprises that following step S102 is to step S106:
Step S102, the primary synchronization channel bandwidth that bandwidth varying ofdm system is set is fixed-bandwidth.
Step S104, the regular bandwidth that the auxiliary synchronization channel to regular bandwidth system or system resource block take is thrown away (tone dropping), obtains irregular bandwidth.Like this, can realize auxiliary synchronization channel bandwidth and system bandwidth variable.
Wherein, this step one of can be in the following manner realizes:
(1) the regular bandwidth take synchronizing sequence sub-block as unit, auxiliary synchronization channel or system resource block being taken is thrown away.
(2) the regular bandwidth take resource mapping subband as unit, auxiliary synchronization channel or system resource block being taken is thrown away.
(3) the regular bandwidth in conjunction with synchronizing sequence sub-block and resource mapping subband, auxiliary synchronization channel or system resource block being taken is thrown away.
(4) the regular bandwidth take the common factor of synchronizing sequence sub-block and resource mapping subband as unit, auxiliary synchronization channel or system resource block being taken is thrown away.
Step S106 utilizes the different sequences of primary synchronization channel to carry the information of irregular bandwidth in the primary synchronization channel bandwidth arranging.
Below implementation of the present invention is described in detail.
System bandwidth is divided into W
1and W
2, primary synchronization channel bandwidth equals system minimum bandwidth; Standard bandwidth is W
2ofdm system available subcarrier be N
used2, it is N that boundary belt takies sub-carrier number
gard2, OFDM subcarrier spacing is df, and secondary synchronization sequences adopts expansion design, that is and, standard bandwidth is W
2secondary synchronization sequences be that standard bandwidth is W
1sequence frequency domain repeat, for example, by being W to standard bandwidth
1sA sequence S1=A, B, C, D, E, F, G, H} is bilateral to be expanded to S2=E, F, G, H, A, B, C, D, E, F, G, H, A, B, C, D}, wherein A, B, C, D, E, F, G, H is the piecemeal of S1 sequence, it is N that each piecemeal takies sub-carrier number
subbk, standard bandwidth is W
2ofdm system available subcarrier N
used2be divided into N
sub2individual subband, as BS2={SB1, SB2, SB3, SB4, SB5, SB6, SB7, SB8, SB9, SB10, SB11, SB12}, wherein, and BS1={SB1, SB2, SB3, SB4, SB5, SB6} is that standard bandwidth is W
1n
sub1individual subband, it is N that each subband takies sub-carrier number
subbd.
System irregular bandwidth is W
i, and W
imeet W
1< W
i< W
2, wherein, W
1and W
2be the regular bandwidth series of standard, choose primary synchronization channel bandwidth and equal system minimum bandwidth.
Selecting system bandwidth is W
ithe secondary synchronization sequences of nonstandard bandwidth (, above-mentioned irregular bandwidth) be
, SI is that standard bandwidth is W
2secondary synchronization sequences both sides throw away remainder composition after (tone dropping) some piecemeal, the block count of remainder is
Wherein, α is systematic sampling rate, and the shared bandwidth of SI is less than or equal to system bandwidth W
i.
Choose nonstandard bandwidth W
isystem take sub-carrier resources
, BSI is for by being W to standard bandwidth
2system take sub-carrier resources both sides and throw away remainder composition after (tone dropping) some subband, the sub band number of remainder is
The shared bandwidth of secondary synchronization sequences of nonstandard bandwidth is less than or equal to system bandwidth W
i.
Choose nonstandard bandwidth W
ithe system broadcast channel method that takies sub-carrier resources comprise: selecting system broadcast channel takies secondary synchronization sequences SI or the system that sub-carrier resources equals nonstandard bandwidth and takies the bandwidth that sub-carrier resources BSI occupies.
Above-mentioned primary synchronization channel is by N
pindividual different sequences composition, is used to indicate different bandwidth information and out of Memory, and wherein, bandwidth information comprises regular bandwidth information and irregular bandwidth information, and out of Memory can comprise: multicarrier information.
Further, N
pthe irregular bandwidth that individual different sequence represents can be the bandwidth that secondary synchronization sequences SI occupies; Also can be that system takies the bandwidth that sub-carrier resources BSI occupies.
Preferably, at N
pin individual different sequence, the only expression system of sequence of the irregular bandwidth representing is an irregular bandwidth system, and the piecemeal SI that concrete bandwidth information is made up of secondary synchronization sequences determines, particularly, bandwidth information is carried out blind Detecting decision by the piecemeal SI that secondary synchronization sequences is formed.
Or, at N
pin individual different sequence, the sequence of the irregular bandwidth of expression can only represent the bandwidth range of irregular bandwidth system, for example, and W
1< W
i< W
2, and the piecemeal SI that concrete bandwidth information is made up of secondary synchronization sequences carries out blind Detecting decision.
The primary method for designing providing by this embodiment, the bandwidth extensibility that the sequence producing has, can meet the synchronous requirement of system simultaneously.
Below in conjunction with the drawings and specific embodiments, the inventive method is described in further detail, take BWA 16m as example.
Fig. 2 is according to the schematic diagram of the P-SCH of the embodiment of the present invention and S-SCH, as shown in Figure 1, primary synchronization channel PA and auxiliary synchronization channel SA send once respectively in super frame period (20 milliseconds), PA sends at second frame of 16m superframe, three SA first symbol transmissions of the 1st 16m unit frame in superframe, the 3rd 16m unit frame and the 4th 16m unit frame respectively, wherein, the bandwidth of PA is fixed as 5MHz.
Fig. 3 is the schematic diagram of the secondary synchronization sequences sub-block of regular bandwidth according to the embodiment of the present invention (5,10,20MHz) 16m system, and as shown in Figure 3, the available subcarrier in 5M bandwidth is counted N
used=432, the multiplexing factor of secondary synchronization sequences proportion is the design of 3 (FFR=3),, the secondary synchronization sequences of each fragment (segment) is mapped to (each base comprises 144 subcarriers) on different subcarrier bases, and 3 segment have 3 nonoverlapping subcarrier bases.Be divided into 8 sub-blocks, i.e. S1=A, B, C, D, E, F, G, H for the secondary synchronization sequences of 0,144 bit of segment.Each sub-block length is 18 bit.For 10MHz and 20MHz bandwidth, 8 sub-blocks, that is, S1=A, B, C, D, E, F, G, H is repeated to utilize (bilateral expansion), forms the secondary synchronization sequences of 10MHz and 20MHz bandwidth.
Below take bandwidth varying between 5MHz to the synchronizing sequence method for designing as example explanation bandwidth varying 16m system of the present invention between 10MHz.Wherein, for the 16m system of 5M bandwidth, available subcarrier is counted N
usedavailable subcarrier in=432,10MHz bandwidth is counted N
used=864.Primary synchronization channel PA sends in minimum system bandwidth 5M bandwidth.
Embodiment mono-
The first implementation of bandwidth varying synchronization channel sequence method for designing is: carry out dropping design take synchronizing sequence sub-block (sub-block) as unit.Below in conjunction with Fig. 4, this implementation is described.
Fig. 4 is the sub-block of secondary synchronization sequences and the schematic diagram of resource subband corresponding relation of regular bandwidth according to the embodiment of the present invention (5,10MHz) 16m system, as shown in Figure 4, wherein with direct current carrier wave (Direct Current, referred to as DC) start to illustrate, because the sequence of SA adopts scalable design, that is, 5MHz adopts 8 sub-block{ABCDEFGH}, and each sub-block takies 54 subcarriers.In order to support between 5MHz to the irregular bandwidth between 10MHz, the subcarrier of 10MHz system is abandoned to (dropping) in the mode of sub-block from both sides, as 16 sub-block both sides of 10MHz system in Fig. 4 are respectively abandoned to two sub-blocks, { EF} and { CD}, obtain the nonstandard bandwidth of Fig. 5, Fig. 5 is according to the schematic diagram of the sub-block of the secondary synchronization sequences of the 16m system of the irregular bandwidth 7.8906250MHz of the embodiment of the present invention and resource subband corresponding relation, as shown in Figure 5, bandwidth is 7.8906250MHz.
In like manner, in the time abandoning the sub-block of varying number, obtain the nonstandard bandwidth series shown in following table.
Therefore,, when take sub-block as the dropping of unit, possible bandwidth varying series is as shown in table 1 below:
Table 1 bandwidth varying
| The sub-block that bandwidth varying comprises | Bandwidth varying series 1 |
| S0＝{A，B，C，D，E，F，G，H} | 5MHz |
| S1＝{H，A，B，C，D，E，F，G，H，A} | 6.8359375～7.8906250MHz |
| S2＝{G，H，A，B，C，D，E，F，G，H，A，B} | 7.8906250～8.94531250MHz |
| S3＝{F，G，H，A，B，C，D，E，F，G，H，A，B，C} | 8.94531250～10MHz |
| S4＝{E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D} | 10MHz |
The shared bandwidth (sub-carrier number) of selecting system broadcast message channel is identical with the shared bandwidth of SA (sub-carrier number), terminal is in the time of initial access, the bandwidth information of carrying by PA,, bandwidth (sub-carrier number) and the shared bandwidth of SA that system broadcast information channel is shared, first detect the Cell id information that SA carries, then, demodulating system broadcast message channel (being arranged in superframe head), thereby know the actual bandwidth of system, the bandwidth information that the actual bandwidth of system carries with PA may be identical, also may be bigger.A kind of PA, SA under this implementation and SFH design are as shown in table 2 below:
Table 2 PA, SA and SFH design
| PA sequence # | SA | Bandwidth (MHz) |
| P1 | A，B，C，D，E，F，G，H | 5 |
| P2 | E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D | 10 |
| P3 | E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D | 20 |
| P4 | F，G，H，A，B，C，D，E，F，G，H，A，B，C | 9 |
| P6 | D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E | 13 |
| P7 | A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H | 16 |
Embodiment bis-
The second implementation of bandwidth varying synchronization channel sequence method for designing is: the design take sub-band as the dropping of unit.
According to 16 system resource mapping modes, the available subcarrier of 5MHZ is divided into 6 sub-band, and each sub-band takies 72 subcarriers.As 12 sub-band both sides of 10MHz system in Fig. 4 are respectively abandoned to two subbands, obtain the nonstandard bandwidth of Fig. 6, its bandwidth is 7.2MHz, now, the Sub-block of SA integrates as S1={H, A, B, C, D, E, F, G, H, A}.
In like manner, in the time abandoning the sub-block of varying number, obtain the nonstandard bandwidth series shown in following table 3.
Therefore,, when take sub-band as the dropping of unit, the Sub-block collection of possible bandwidth series, system resource block (subband) and corresponding SA is:
The nonstandard bandwidth series of table 3
| The sub-band that irregular bandwidth comprises | The Sub-block collection of SA | Bandwidth 2 |
| {SB1，SB2，SB3，SB4，SB5，SB6} | S0 | 5MHz |
| {SB1，SB2，SB3，SB4，SB5，SB6， SB7} | S0 | 6.48MHz |
| {SB1，SB2，SB3，SB4，SB5，SB6， SB7，SB8} | S1 | 7.19MHz |
| {SB1，SB2，SB3，SB4，SB5，SB6， SB7，SB8，SB9} | S2 | 7.89MHz |
| {SB1，SB2，SB3，SB4，SB5，SB6， SB7，SB8，SB9，SB10} | S2 | 8.59MHz |
| {SB1，SB2，SB3，SB4，SB5，SB6， SB7，SB8，SB9，SB10，SB11} | S3 | 9.30MHz |
| {SB1，SB2，SB3，SB4，SB5，SB6， SB7，SB8，SB9，SB10，SB11，SB12} | S4 | 10MHz |
Press the shared bandwidth (sub-carrier number) of table 3 corresponding relation selecting system broadcast message channel and the shared bandwidth of SA (sub-carrier number), terminal is in the time of initial access, the bandwidth information of carrying by PA,, the bandwidth (sub-carrier number) that system broadcast information channel is shared, determine the shared bandwidth of SA, first detect the Cell id information that SA carries, then, demodulating system broadcast message channel (being arranged in superframe head), thereby know the actual bandwidth of system, the bandwidth information that the actual bandwidth of system carries with PA may be identical, also may be bigger.A kind of PA, SA under this implementation and SFH design are as shown in table 4 below:
Table 4 PA, SA and SFH design
| PA sequence # | The sub-block that subband/SA that SFH occupies occupies | Bandwidth (MHz) |
| P1 | {SB1，SB2，SB3，SB4，SB5，SB6}A，B，C，D，E，F，G，H | 5 |
| P2 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8；SB9，SB10，SB11，SB12}E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D | 10 |
| P3 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8，；SB9，SB10，SB11，SB12，SB13，SB14，SB15，SB16；SB17，SB18，SB19，SB20，SB21，SB22，SB23，SB24}E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D | 20 |
| P4 | N/A | 7 |
| P5 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8；SB9}G，H，A，B，C，D，E，F，G，H，A，B | 8.75 |
| P6 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8，；SB9，SB10，SB11，SB12SB13，SB14，SB15}；C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F | 14 |
| P7 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8，；SB9，SB10，SB11，SB12，SB13，SB14，SB15，SB16；SB17，SB18，SB19，SB20}；H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A | 17.5 |
Embodiment tri-
The third implementation of bandwidth varying synchronization channel sequence method for designing is: in conjunction with the dropping design of SAsub-block and resource mapping subband size.
In this method, bandwidth varying choose with the dropping of SA sub-block and resource mapping subband size after bandwidth and the immediate Series Design of nonstandard bandwidth, so, also referred to as mixing dropping design.
Now, the shared bandwidth (sub-carrier number) of system broadcast information channel may be different from the shared bandwidth of SA (sub-carrier number), terminal is in the time of initial access, the bandwidth information of carrying by PA, , the bandwidth (sub-carrier number) that system broadcast information channel is shared or the shared bandwidth of SA (sub-carrier number), determine the shared bandwidth of SA, first detect the CellID information that SA carries, then, demodulating system broadcast message channel (being arranged in superframe head), thereby know the actual bandwidth of system, the bandwidth information that the actual bandwidth of system carries with PA may be identical, also may be bigger.A kind of PA, SA under this implementation and SFH design are as shown in table 5 below:
Table 5 PA, SA and SFH design
| PA sequence # | The sub-block that subband/SA that SFH occupies occupies | Bandwidth (MHz) |
| P1 | {SB1，SB2，SB3，SB4，SB5，SB6}A，B，C，D，E，F，G，H | 5 |
| P2 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8；SB9，SB10，SB11，SB12}E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D | 10 |
| P3 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8，；SB9，SB10，SB11，SB12，SB13，SB14，SB15，SB16；SB17，SB18，SB19，SB20，SB21，SB22，SB23，SB24}E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D | 20 |
| P4 | H，A，B，C，D，E，F，H，H，A | 7 |
| P5 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8；SB9}G，H，A，B，C，D，E，F，G，H，A，B | 8.75 |
| P6 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8，；SB9，SB10，SB11，SB12SB13，SB14，SB15}；C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F | 14 |
| P7 | {SB1，SB2，SB3，SB4，SB5，SB6，SB7，SB8，；SB9，SB10，SB11，SB12，SB13，SB14，SB15，SB16；SB17，SB18，SB19，SB20}；H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A | 17.5 |
Embodiment tetra-
The 4th kind of implementation of bandwidth varying synchronization channel sequence method for designing is: the common factor of choosing SAsub-block and resource mapping subband size is that unit does dropping design.
Now, the actual available bandwidth of system (sub-carrier number) is identical with the shared bandwidth of SA (sub-carrier number).PA carries the system bandwidth information of SA sequence, is also the occupied sub-block information of SA, or the FFT transform size of system and/or available subcarrier information.Terminal is in the time of initial access, the sub-block information that the system bandwidth information of the SA sequence of carrying by PA or SA are occupied or the FFT transform size of system and/or available subcarrier information, determine the actual available bandwidth (sub-carrier number) of the shared bandwidth system of SA.
Under implementation, a kind of PA, SA design as following table 6 accordingly, according to the size of Sub-block (54 subcarrier) and subband (72 subcarrier), determine 4 kinds of spread bandwidths.
Table 6 PA, SA design
| The bandwidth information that PA carries | The Sub-block collection of SA |
| 5M(512FFT) | A，B，C，D，E，F，G，H |
| 10M (or 1024FFT) | E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D |
| 20M (or 2048FFT) | E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D ，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D |
| Spread bandwidth 1 (1024FFT, available subcarrier (not containing DC)=648) | G，H，A，B，C，D，E，F，G，H，A，B |
| Spread bandwidth 2 (2048FFT, available subcarrier (not containing DC)=1080) | C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F |
| Spread bandwidth 3 (2048FFT, available subcarrier (not containing DC)=1296) | A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H， |
| Spread bandwidth 4 (2048FFT, available subcarrier (not containing DC)=1512) | G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B，C，D，E，F，G，H，A，B |
Device embodiment
According to embodiments of the invention, provide a kind of design apparatus of synchronization access sequence.Fig. 7 is according to the structured flowchart of the design apparatus of the synchronization access sequence of the embodiment of the present invention, and as shown in Figure 7, this device comprises: module 72 is set, and processing module 74, carries module 76, below said structure is described in detail.
Module 72 is set, and is fixed-bandwidth for the primary synchronization channel bandwidth of bandwidth varying ofdm system is set; Processing module 74, throws away for the regular bandwidth of the auxiliary synchronization channel to regular bandwidth system or system resource block, obtains irregular bandwidth; Carry module 76, be connected to module 72 and processing module 74 are set, for utilizing the different sequences of primary synchronization channel to carry the information of the irregular bandwidth that processing module 74 obtains in the primary synchronization channel bandwidth that module 72 arranges arranging.
Wherein, processing module 74 one of can be in the following manner realizes:
(1) take synchronizing sequence sub-block as unit, the regular bandwidth to auxiliary synchronization channel or system resource block is thrown away.
(2) take resource mapping subband as unit, the regular bandwidth to auxiliary synchronization channel or system resource block is thrown away.
(3) in conjunction with synchronizing sequence sub-block and resource mapping subband, the regular bandwidth of auxiliary synchronization channel or system resource block is thrown away.
(4) take the common factor of synchronizing sequence sub-block and resource mapping subband as unit, the regular bandwidth of auxiliary synchronization channel or system resource block is thrown away.
In sum, pass through the above embodiment of the present invention, the primary synchronization channel bandwidth of fixing bandwidth varying ofdm system, by the tone dropping of regular bandwidth system auxiliary synchronization channel or system resource block is realized to auxiliary synchronization channel bandwidth and system bandwidth variable, utilize the different sequences of primary synchronization channel to carry irregular bandwidth, solve and also do not had corresponding design to realize the problem of the synchronizing process of irregular bandwidth at present, by the design of synchronization access sequence of the present invention, there is good bandwidth extensibility, can meet the synchronous requirement of system simultaneously.
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 the network that multiple calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module to be realized.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 modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. a method for designing for synchronization access sequence, is applied to bandwidth varying ofdm system, it is characterized in that, described method comprises:
The primary synchronization channel bandwidth that described bandwidth varying ofdm system is set is fixed-bandwidth;
The regular bandwidth that auxiliary synchronization channel to regular bandwidth system or system resource certainly take is thrown away, and obtains irregular bandwidth;
In the described primary synchronization channel bandwidth arranging, utilize the different sequences of primary synchronization channel to carry the information of described irregular bandwidth.
2. method according to claim 1, is characterized in that, it is that fixed-bandwidth comprises that described primary synchronization channel bandwidth is set:
It is system minimum bandwidth that described primary synchronization channel bandwidth is set.
3. method according to claim 1, is characterized in that, the regular bandwidth that described auxiliary synchronization channel or described system resource block are taken throw away comprise one of following:
The regular bandwidth described auxiliary synchronization channel or described system resource block being taken take synchronizing sequence sub-block as unit is thrown away;
The regular bandwidth described auxiliary synchronization channel or described system resource block being taken take resource mapping subband as unit is thrown away;
The regular bandwidth described auxiliary synchronization channel or described system resource block being taken in conjunction with synchronizing sequence sub-block and resource mapping subband is thrown away;
The regular bandwidth described auxiliary synchronization channel or described system resource block being taken take the common factor of synchronizing sequence sub-block and resource mapping subband as unit is thrown away.
4. method according to claim 1, is characterized in that, the secondary synchronization sequences of described bandwidth varying ofdm system is less than the secondary synchronization sequences of described regular bandwidth system.
5. method according to claim 1, it is characterized in that, the remainder that the secondary synchronization sequences of described bandwidth varying ofdm system is thrown away after part piecemeal by the secondary synchronization sequences both sides of described system convention bandwidth forms, and wherein, the block count of described remainder is
w
ifor described irregular bandwidth, α is systematic sampling rate, N
subbkfor each piecemeal takies sub-carrier number, df is subcarrier spacing, N
gard2for boundary belt takies sub-carrier number.
6. method according to claim 1, it is characterized in that, the remainder that throw away after part subband on the sub-carrier resources both sides that the sub-carrier resources that described bandwidth varying ofdm system takies is taken by described regular bandwidth system forms, and wherein, the sub band number of described remainder is
w
ifor described irregular bandwidth, α is systematic sampling rate, N
subbdfor each subband takies sub-carrier number, df is subcarrier spacing, and the bandwidth that the secondary synchronization sequences of described bandwidth varying ofdm system takies is less than or equal to system bandwidth, N
gard2for boundary belt takies sub-carrier number.
7. method according to claim 1, is characterized in that, system broadcast channel takies secondary synchronization sequences or the system that sub-carrier resources is described bandwidth varying ofdm system and takies the bandwidth that sub-carrier resources is occupied.
8. according to the method described in any one in claim 1 to 7, it is characterized in that, described different sequences are used to indicate different bandwidth information and multicarrier information, and wherein, described bandwidth information comprises regular bandwidth information and irregular bandwidth information.
9. method according to claim 8, is characterized in that, it is one of following that described irregular bandwidth information comprises:
Bandwidth, system that secondary synchronization sequences occupies take the bandwidth that sub-carrier resources is occupied.
10. method according to claim 8, is characterized in that, for the sequence of carrying described irregular bandwidth information only indication mechanism be irregular bandwidth system, concrete bandwidth information is carried out blind Detecting by the piecemeal of secondary synchronization sequences and is determined.
11. methods according to claim 8, is characterized in that, only indicate the bandwidth range of irregular bandwidth system for carrying the sequence of described irregular bandwidth information, and concrete bandwidth information is carried out blind Detecting by the piecemeal of secondary synchronization sequences and determined.
The design apparatus of 12. 1 kinds of synchronization access sequences, is characterized in that, comprising:
Module is set, and is fixed-bandwidth for the primary synchronization channel bandwidth of bandwidth varying ofdm system is set;
Processing module, the regular bandwidth taking for the auxiliary synchronization channel to regular bandwidth system or system resource block is thrown away, and obtains irregular bandwidth;
Carry module, for utilizing the different sequences of primary synchronization channel to carry the information of described irregular bandwidth in the described primary synchronization channel bandwidth arranging.
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| CN101420261A (en) * | 2007-10-26 | 2009-04-29 | 中兴通讯股份有限公司 | Synchronous information sending method of OFDM system and cell searching method |
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| CN1933470A (en) * | 2005-09-13 | 2007-03-21 | 上海贝尔阿尔卡特股份有限公司 | Distributing type multi-transmitting multi-receiving-quadrature frequency division multiplexing system frame synchronizing method and apparatus |
| CN101420261A (en) * | 2007-10-26 | 2009-04-29 | 中兴通讯股份有限公司 | Synchronous information sending method of OFDM system and cell searching method |
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