CN101958743A - Sync signal mapping method and device for relay link - Google Patents

Abstract

The invention provides a sync signal mapping method and a sync signal mapping device for a relay link. In the invention, a synchronizing sequence is generated, the mapping positions of sync signal in a frequency direction and a time direction are determined, and thus a specific sync signal mapping manner of a back haul link from a base station to a relay node is realized. The sync signal mapping method and device are well applied to the back haul link from the base station to the relay node, and the sync signal mapping manner is simple; therefore, backward compatibility (compatible with an LTE system) is ensured, and the problem that the relay node cannot correctly receive the primary sync signal (PSS) and the supplementary sync signal (SSS) transmitted from the base station is solved. In the method, a low cost is adopted and a normal completion of tracking by the relay node is ensured.

Description

The synchronizing signal mapping method and the device of repeated link

Technical field

The present invention relates to the synchronizing signal mapping techniques, refer to a kind of synchronizing signal mapping method and device of repeated link especially.

Background technology

Long Term Evolution (LTE, Long Term Evolution) system, senior Long Term Evolution (LTE-A, Long Term Evolution Advanced) system and senior international mobile communication system (IMT-Advanced, International Mobile Telecommunication Advanced) all be with OFDM (OFDM, Orthogonal Frequency Division Multiplexing) technology is the system on basis, mainly is the data mode of time-frequency bidimensional in ofdm system.Fig. 1 is the schematic diagram that concerns of Resource Block, subcarrier, and as shown in Figure 1, all lattices are represented a Resource Block, and diagonal line hatches is represented subcarrier.

In LTE system, LTE-A system, Resource Block (RB, Resource Block) is defined as the OFDM symbol in continuous 1 time slot (slot) on time-domain, continuous 12 or 24 subcarriers on frequency domain, so 1 RB by Individual Resource Unit (RE, Resource Element) is formed, wherein, and N _SymbThe number of representing the OFDM symbol in 1 slot,

The number of expression Resource Block continuous subcarrier on frequency domain.

At present, there are 504 Physical Cell Identifier (PCID, Physical-layer Cell Identity) in the LTE system, and PCID is divided into 168 PCID groups (groups), and each group comprises 3 unique PCID, and PCID is by formula

Determine, wherein,

Expression PCID group and value from " 0 " to " 167 ",

Expression in the group PCID and value from " 0 " to " 2 "; Synchronizing signal comprises master sync signal (PSS, Primary Synchronization Signal) and auxiliary synchronous signals (SSS, Secondary SynchronizationSignal), the cycle of synchronizing signal is 5ms, and PSS sends on a certain identical antenna with SSS; PSS is made of frequency domain Zadoff-Chu sequence and carries

SSS is made of binary m sequence and carries

Table 1 is the mapping relations of PSS, and in the table 1, n is a numerical index in the sequence, and k is a sub-carrier indices, and l is the OFDM notation index, and d (n) represents synchronizing sequence, a _{K, l}The time-frequency position of expression synchronizing sequence mapping,

The quantity of expression downlink resource piece,

The quantity of representing Resource Block subcarrier on frequency direction.

Table 1

Table 2 is the mapping relations of SSS, and in the table 2, n is a numerical index in the sequence, and k is a sub-carrier indices, and l is the OFDM notation index, and d (n) represents synchronizing sequence, a _{K, l}The time-frequency position of expression synchronizing sequence mapping,

The quantity of expression downlink resource piece,

The quantity of representing Resource Block subcarrier on frequency direction.

Table 2

The goal in research of B3G/4G is to compile connecting systems such as honeycomb, fixed wireless access, nomadic, radio area network, in conjunction with complete IP network, being respectively the user under high speed and low speed mobile environment provides peak rate to reach the wireless transmission capability of 100Mbps and 1Gbps, and realize the seamless connection of cellular system, regional wireless network, broadcasting, telstar communication, make the mankind realize that anyone realizes communicating by letter of any way with all other men at any time and any place.In order to reach this purpose, relaying (Relay) technology can be used as effective measures, and like this, the covering that via node (RN, Relay Node) both can increase the sub-district also can increase cell capacity.

Fig. 2 is a structural representation of introducing via node in the system, as shown in Figure 2, increased new link after introducing RN in the system, comprising that link between evolution base station eNode-B and the RN is called back haul link (backhaul link) or is called the link that the link between repeated link, RN and the subscriber equipment (UE, User Equipment) is called between access link (access link), eNode-B and the UE is called the link that direct transfers (direct link).

During relaying (inband-Relay), promptly eNB operates on identical frequency resource to the access link between UE with RN to the back haul link between RN in adopting band.Because the Relay launching opportunity produces interference (being called self-interference) to the receiver of self in the band, so eNB on identical frequency resource is impossible with RN simultaneously to the UE link to the RN link, unless enough Signal Separation and isolation between antennas are arranged.In like manner, RN also can not launch data to eNB when receiving the data that UE launched.

According to the regulation in the present LTE system, Fig. 3 is the composition schematic diagram of radio frames in the LTE system, and among Fig. 3, the lattice of snow shadow representation is radio frames (frame), the lattice that left side diagonal line hatches is represented is subframe (subframe), and blank lattice is represented the OFDM symbol.As shown in Figure 3,1 10ms frame constitutes (adopting #0～#9 to represent) by the subframe of 10 1ms, can comprise clean culture (Unicast) and multicast and broadcast (Multicast Broadcast).Wherein, when Frequency Division Duplexing (FDD) (FDD, Frequency DivisionDuplex) mode, #0, #5 subframe be as the emission synchronizing signal, and #4, #9 subframe are as paging (paging); When time division duplex (TDD, Time Division Duplex) mode, #0, #5 subframe be as the emission synchronizing signal, and #1, #6 subframe are as paging.That is to say, for the FDD mode, { #0, #4, #5, #9} subframe, for the TDD mode, { #0, #1, #5, the existing special purpose of #6} subframe, the subframe of these special purposes can not be used for the distribution of Multicast Broadcast Single Frequency Network (MBSFN, Multicast Broadcast Single FrequencyNetwork) subframe, and promptly assignable MBSFN subframe mostly is 6 subframes most in 1 radio frames.

In order to solve the transmitting-receiving interference problem, a kind of possible implementation method is when RN receives data from eNB, do not carry out firing operation to UE, that is to say, behind the UE link, need to increase gap (gap) at RN, be used for RN subframe, make UE in the gap time range, not carry out any reception/firing operation by configuration MBSFN subframe, and RN finishes the switching that is transmitted into reception in the gap time range, switches after finishing in the data of the OFDM of back symbol reception from eNB.Wherein, in the LTE system, adopt MBSFN subframe to be used for RN subframe, present specific implementation is: multimedia controlled entity (MCE, MBMS Control Entity) at first to the available MBSFNsubframe of eNB configuration, eNB is the available RN subframe of configuration in these available MBSFN subframe again.Therefore, when descending, RN at first gives its subordinate's UE emission control information at preceding 1 or 2 OFDM symbol, comprise up emission data feedback information (ACK/NACK, Acknowlegment/NegativeAcknowlegment) and uplink authorization (UL grant) information.

According to the regulation in the present LTE system, FDD{#0, #4, #5, #9} subframe, TDD{#0, #1, #5, #6} subframe have above-mentioned special purpose, so can not be used for the distribution of Multicast Broadcast Single Frequency Network MBSFN subframe, and PSS/SSS launches at #0, #1, #5, #6 subframe, and #0, #1, #5, #6 subframe can not be as backhaul subframe (backhaul subframe), and this must cause the RN that is in operating state can't normally receive PSS, the SSS that eNode-B issues.

At present, be a focus for MBSFN subframe as the research of backhaul subframe, still, eNode-B does not but have relevant programme to propose to the concrete synchronizing signal mapping mode of the back haul link of RN.

Cell searching is based on PSS, SSS, reference signal (RS, Reference Signal), obtain PCID so that follow-up work by this process, because synchronizing signal is the signal that UE detects when carrying out Cell searching at first, for UE, synchronizing signal can play the synchronous effect of time and frequency, and the effect of transmitting PCID.When UE has finished cell search process, synchronizing signal only is used for UE and follows the tracks of.Consider the two clock accuracy situations of sending out of transmitting-receiving, can there be sampling deviation in receiving-transmitting sides, and then can cause the step-out of receiving-transmitting sides, if RN works according to the eNode-B clock accuracy, and about every 300ms, RN need follow the tracks of synchronously; If RN works according to the UE clock accuracy, about every 5ms, RN need follow the tracks of synchronously.

Learn by above analysis, for back haul link, RN when carrying out Cell searching and ordinary terminal as broad as long, the selection of RN clock accuracy should be able to be used the clock accuracy similar with the base station, so RN only needs to follow the tracks of whether be in desynchronizing state when normal operating conditions, and the PSS that tracking synchronously can only send by the cycle gets final product, PSS on the back haul link is called the master sync signal (R-PSS of repeated link herein, RN link-Primary Synchronization Signal) or be called the synchronizing signal (R-SS, RN link-Synchronization Signal) of repeated link.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of synchronizing signal mapping method of repeated link, can realize that the base station arrives the concrete synchronizing signal mapping mode of back haul link of via node.

Another object of the present invention is to provide a kind of synchronizing signal mapping device of repeated link, can realize that the base station arrives the concrete synchronizing signal mapping mode of back haul link of via node.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of synchronizing signal mapping method of repeated link, this method comprises:

Generate the synchronizing sequence of the back haul link between base station and via node;

The definite mapping position of synchronizing signal on frequency direction that is made of the synchronizing sequence that generates determined the mapping position of synchronizing signal on time orientation that is made of the synchronizing sequence that generates.

Described generation synchronizing sequence comprises: described synchronizing signal is made of frequency domain Zadoff-Chu sequence, the root sequence index u of Zadoff-Chu sequence with

Correspondence, wherein

Physical Cell Identifier PCID in the expression group.

Described generation synchronizing sequence comprises: described synchronizing signal is made of time domain Zadoff-Chu sequence, the root sequence index u of Zadoff-Chu sequence with

Correspondence, perhaps the root sequence index u of Zadoff-Chu sequence with

It doesn't matter, wherein

Physical Cell Identifier PCID in the expression group.

Described generation synchronizing sequence comprises: described synchronizing signal is made of frequency domain Zero Correlation Zone sequence, the Code ID index of Zero Correlation Zone sequence with

Correspondence, perhaps the Code ID index of Zero CorrelationZone sequence with

It doesn't matter, wherein

Physical Cell Identifier PCID in the expression group.

Described generation synchronizing sequence comprises: described synchronizing signal is made of time domain Zero Correlation Zone sequence, the Code ID index of Zero Correlation Zone sequence with Correspondence, perhaps the Code ID index of Zero CorrelationZone sequence with It doesn't matter, wherein

Physical Cell Identifier PCID in the expression group.

If the Code ID index of the root sequence index u of described Zadoff-Chu sequence or described Zero Correlation Zone sequence, with

Correspondence, this method further comprises:

When described via node was followed the tracks of, it was right only to need

Corresponding sequence is made related operation.

If the Code ID index of the root sequence index u of described Zadoff-Chu sequence or described Zero Correlation Zone sequence, with

It doesn't matter, and this method further comprises:

By the different synchronizing signal beared information of described base station to the via node link.

Described information is the distinctive public information of described via node.

When described method is applied to Long Term Evolution LTE system or senior Long Term Evolution LTE-A system,

If described synchronizing signal is made of frequency domain or time domain Zadoff-Chu sequence, described Zadoff-Chu sequence d _u(n) be shown below:

$d_u\left(n\right)=\left\{\begin{array}{cc}{e}^{-j\frac{\mathrm{\πun}(n+1)}{63}}& n=\mathrm{0,1},...,30\\ e^{-j\frac{\mathrm{\πu}(n+1)(n+2)}{63}}& n=\mathrm{31,32},...,61\end{array}\right.$ Wherein, n is a numerical index in the sequence;

If the root sequence index u of described Zadoff-Chu sequence with

Correspondence, its corresponding relation are 25 corresponding with 0, and 29 is corresponding with 1, and 34 is corresponding with 2.

When described method is applied to LTE system or LTE-A system,

If described synchronizing signal is made of frequency domain or time domain Zero Correlation Zone sequence, described ZeroCorrelation Zone sequence F ⁿBe shown below:

$F^n={\left[\begin{array}{cccccc}{F}_{11}^n& \·\·\·& F_{1M\′}^n& F_{1(M\′+1)}^n& \·\·\·& F_{1(2M\′)}^n\\ F_{21}^n& \·\·\·& F_{2M\′}^n& F_{2(M\′+1)}^n& \·\·\·& F_{2(2M\′)}^n\\ \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·\\ \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·\\ F_{(2M\′-1)1}^n& \·\·\·& F_{(2M\′-1)M\′}^n& F_{(2M\′-1)(M\′+1)}^n& \·\·\·& F_{(2M\′-1)(2M\′)}^n\\ F_{(2M\′)1}^n& \·\·\·& F_{(2M\′)M\′}^n& F_{(2M\′)(M\′+1)}^n& \·\·\·& F_{(2M\′)(2M\′)}^n\end{array}\right]}_{M\×L}$ Wherein,

$\begin{array}{c}M=2\×M\′\\ F_{i1}^n=F_{i1}^{n-1}{F}_{i1}^{n-1},\·\·\·,F_{\mathrm{iM}\′}^n=F_{\mathrm{iM}\′}^{n-1}{F}_{\mathrm{iM}\′}^{n-1}\\ F_{i(1+M\′)}^n=(-F_{i1}^{n-1})F_{i1}^{n-1},\·\·\·,F_{i(2M\′)}^n\\ F_{(i+M\′)}^n=F_{i(1+M\′)}^n,...,F_{(i+M\′)M\′}^n=F_{i(2M\′)}^n\\ F_{(i+M\′)(1+M\′)}^n=F_{i1}^n,...,F_{(i+M\′)(2M\′)}^n=F_{\mathrm{iM}\′}^n\end{array}=(-F_{\mathrm{iM}}^{n-1})F_{\mathrm{iM}}^{n-1},$

By

Negate and obtain;

F ⁿRepresent a ZCZ sign indicating number collection, F (L, M, Z _CZ)=F (2 ^2n+m+1, 2 ^N+1, 2 ^N+m+ 1), its code word number is M, and code length is L, and zero correlation window length is Z _CZ=min{Z _ACZ, Z _CCZ, Z _ACZAnd Z _CCZRepresent auto-correlation zero district and cross-correlation zero district respectively;

If the Code ID index of described Zero Correlation Zone sequence with

Correspondence, its corresponding relation are 00 corresponding with 0, and 01 is corresponding with 1, and 10 is corresponding with 2.

The described definite mapping position of described synchronizing signal on frequency direction comprises:

Described synchronizing signal is mapped in, and on each 540kHz frequency location about the midbandwidth symmetry, and Far Left and rightmost 5 carrier waves do not carry any data as the protection subcarrier in 72 subcarriers.

The described definite mapping position of described synchronizing signal on frequency direction comprises:

Described synchronizing signal is mapped in, and on each (m/2) * 180kHz frequency location about the midbandwidth symmetry, wherein, (m/2) * 180kHz represents the band width of m/2 Resource Block RB, the band width of common m RB, i.e. and m*180kHz, wherein m is a positive integer.

The described definite mapping position of described synchronizing signal on frequency direction comprises:

Described synchronizing signal is mapped in, on the frequency location with the midbandwidth symmetry, and the band width of m RB altogether, i.e. m*180kHz, wherein m is a positive integer, describedly can not fix with the frequency location of midbandwidth symmetry, or can not fix.

The described definite mapping position of described synchronizing signal on time orientation comprises:

Satisfy to the subframe of the synchronizing signal mapping of via node link described base station:

R-PSS-SF ∈ { RF|SFN mod n=0}, wherein R-PSS-SF represents described synchronizing signal place subframe, RF represents described synchronizing signal place radio frames, and SFN is a System Frame Number, and n represents that the base station is a positive integer to the wireless frame period and the n of the synchronizing signal mapping of via node link; Mod represents complementation.

Described R-PSS-SF is the public back haul link subframe of of all via nodes, perhaps is non-public back haul link subframe.

The described definite mapping position of described synchronizing signal on time orientation comprises:

When FDD adopted identical orthogonal frequency division multiplex OFDM character position with TDD system, described synchronizing signal was mapped in the 1st OFDM of inverse of the 1st time slot among the described R-PSS-SF;

When FDD adopts different OFDM character positions with the TDD system,

For the FDD system, described synchronizing signal is mapped in the 1st OFDM of inverse of the 1st time slot among the described R-PSS-SF;

For the TDD system, described synchronizing signal is mapped in the 1st OFDM of inverse of the 2nd time slot among the described R-PSS-SF, perhaps is mapped among the described R-PSS-SF in the 3rd OFDM.

A kind of synchronizing signal mapping device of repeated link comprises synchronizing sequence generation module, first mapping block and second mapping block, wherein,

The synchronizing sequence generation module is used to generate the synchronizing sequence of the back haul link between base station and via node, and the synchronizing sequence that generates is exported to first mapping block and second mapping block;

First mapping block is used for the definite mapping position of synchronizing signal on frequency direction that is made of the synchronizing sequence that generates;

Second mapping block is used for the definite mapping position of synchronizing signal on time orientation that is made of the synchronizing sequence that generates.

The technical scheme that provides from the invention described above as can be seen, the present invention program is by the generation of synchronizing sequence, and synchronizing signal has realized the back haul link concrete synchronizing signal mapping mode of base station to via node on the frequency direction and the determining of the mapping position on the time orientation.The inventive method is applicable to that well the base station arrives the back haul link between via node, the synchronizing signal mapping mode is simple, both guaranteed backwards compatibility (compatible LTE system), also solved the correct PSS that issues from the base station, the problem of SSS of receiving of via node, adopt low expense, guaranteed that simultaneously via node normally finishes tracking work.

Description of drawings

Fig. 1 is the schematic diagram that concerns of Resource Block, subcarrier;

Fig. 2 is a structural representation of introducing via node in the system;

Fig. 3 is the composition schematic diagram of radio frames in the LTE system;

Fig. 4 is the flow chart of the synchronizing signal mapping method of repeated link of the present invention;

Fig. 5 is the composition structural representation of the synchronizing signal mapping device of repeated link of the present invention;

Fig. 6 is the schematic diagram of the embodiment of the R-PSS that is the cycle with 32 radio frames;

The R-PSS that Fig. 7 is is the cycle with 64 radio frames, the schematic diagram of the embodiment of public back haul link subframe carrying R-PSS;

The R-PSS that Fig. 8 is is the cycle with 64 radio frames, the schematic diagram of the embodiment of non-public back haul link subframe carrying R-PSS;

Fig. 9 is that FDD and TDD system adopt different OFDM symbols carry R-PSS, with the schematic diagram of the embodiment of the band width of totally 6 RB on the frequency location of midbandwidth symmetry;

Figure 10 is that FDD and TDD system adopt identical OFDM symbols carry R-PSS, with the schematic diagram of the embodiment of the band width of totally 6 RB on the frequency location of midbandwidth symmetry;

Figure 11 is that FDD and TDD system adopt identical OFDM symbols carry R-PSS, not with the schematic diagram of the embodiment of the band width of totally 3 RB on the frequency location of midbandwidth symmetry.

Embodiment

Fig. 4 is the flow chart of the synchronizing signal mapping method of repeated link of the present invention, as shown in Figure 4, may further comprise the steps:

Step 400: the synchronizing sequence that generates the back haul link between base station and via node.

In this step, the base station is identical or different to the main synchronizing sequence generation method of terminal links with the base station to the synchronizing sequence generation method of via node link.Specifically:

Arrive the main synchronizing sequence generation method of terminal links to the synchronizing sequence method of generationing of via node link and base station when identical when the base station, specific implementation is: synchronizing signal is made of frequency domain Zadoff-Chu sequence, the root sequence index u of Zadoff-Chu sequence and

Corresponding.Wherein,

PCID in the expression group is an example with the LTE system, its value from 0 to 2;

Expression PCID group, its value of LTE system from 0 to 167.

The main synchronizing sequence generation method that arrives terminal links to the synchronizing sequence method of generationing of via node link and base station when the base station not simultaneously, specific implementation is:

Synchronizing signal is made of time domain Zadoff-Chu sequence, the root sequence index u of Zadoff-Chu sequence with

Corresponding or with

It doesn't matter;

Perhaps, synchronizing signal constitutes (be also referred to as the zero correlation window sequence, or zero correlation zone sequence) by frequency domain Zero Correlation Zone sequence, the Code ID index of Zero Correlation Zone sequence with Corresponding or with

It doesn't matter;

Perhaps, synchronizing signal is made of time domain Zero Correlation Zone sequence, the Code ID index of Zero Correlation Zone sequence with

Corresponding or with

It doesn't matter.

When the root sequence index u of Zadoff-Chu sequence or the Code ID index of Zero Correlation Zone sequence, with

To at once, when via node was followed the tracks of, it was right only to need

Corresponding sequence is made related operation and is got final product.

When the root sequence index u of Zadoff-Chu sequence or the Code ID index of Zero Correlation Zone sequence, with

When it doesn't matter, can can carry some information to the different synchronizing signal of via node link by the base station, these information can be the distinctive public informations of via node, as back haul link subframe configuration information or back haul link sub-frame configuration changed information etc.Need to prove that via node has obtained relevant information such as the PCID in sub-district after carrying out synchronously as ordinary terminal; And for the base station during to synchronous trackings of via node link, the synchronizing signal of selecting this moment and base station can be different to the synchronizing signal of terminal, also can be understood as: at this moment synchronizing signal and

It doesn't matter, that is to say, present synchronizing sequence also can carry the distinctive public information of via node, can certainly carry cell information, can certainly not carry any information.

In this step,, be example with LTE system or LTE-A system if R-PSS is made of frequency domain or time domain Zadoff-Chu sequence, Zadoff-Chu sequence d _u(n) as shown in Equation (1):

$d_u\left(n\right)=\left\{\begin{array}{cc}{e}^{-j\frac{\mathrm{\πun}(n+1)}{63}}& n=\mathrm{0,1},...,30\\ e^{-j\frac{\mathrm{\πu}(n+1)(n+2)}{63}}& n=\mathrm{31,32},...,61\end{array}\right.---\left(1\right)$

Wherein, n is a numerical index in the sequence.The root sequence index u of Zadoff-Chu sequence is obtained by table 3, table 3 be root sequence index (Root index) u and

Corresponding relation.

Table 3

If R-PSS is made of frequency domain or time domain Zero Correlation Zone sequence, is example with LTE system or LTE-A system, Zero Correlation Zone sequence F ⁿAs shown in Equation (4).

If n=0, motif classify as shown in the formula (2):

$F^0=\left[\begin{array}{cc}{F}_{11}^0& F_{12}^0\\ F_{21}^0& F_{22}^0\end{array}\right]={\left[\begin{array}{cc}-X^m& Y^m\\ -\stackrel{\←}{Y^m}& \stackrel{\←}{X^m}\end{array}\right]}_{2\×2^{m+1}}---\left(2\right)$

In the formula (2), suppose

Wherein,

Represent sequence X respectively ^m, Y ^mCounter-rotating.

Produce sequence F by basic sequence by alternative manner ¹, as shown in Equation (3):

$F^1=\left[\begin{array}{cccc}{F}_{11}^1& F_{12}^1& F_{13}^1& F_{14}^1\\ F_{21}^1& F_{22}^1& F_{23}^1& F_{24}^1\\ F_{31}^1& F_{32}^1& F_{33}^1& F_{34}^1\\ F_{41}^1& F_{42}^1& F_{43}^1& F_{44}^1\end{array}\right]=\left[\begin{array}{cccc}{F}_{11}^0{F}_{11}^0& F_{12}^0{F}_{12}^0& (-F_{11}^0)F_{11}^0& (-F_{12}^0)F_{12}^0\\ F_{21}^0{F}_{21}^0& F_{22}^0{F}_{22}^0& (-F_{21}^0)F_{21}^0& (-F_{22}^0)F_{22}^0\\ (-F_{11}^0)F_{11}^0& (-F_{12}^0)F_{12}^0& F_{11}^0{F}_{11}^0& F_{12}^0{F}_{12}^0\\ (-F_{21}^0)F_{21}^0& (-F_{22}^0)F_{22}^0& F_{21}^0{F}_{21}^0& F_{22}^0{F}_{22}^0\end{array}\right]---\left(3\right)$

Can obtain producing F thus ⁿIterative rules, as shown in Equation (4), wherein, n＞1.

$F^n={\left[\begin{array}{cccccc}{F}_{11}^n& \·\·\·& F_{1M\′}^n& F_{1(M\′+1)}^n& \·\·\·& F_{1(2M\′)}^n\\ F_{21}^n& \·\·\·& F_{2M\′}^n& F_{2(M\′+1)}^n& \·\·\·& F_{2(2M\′)}^n\\ \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·\\ \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·\\ F_{(2M\′-1)1}^n& \·\·\·& F_{(2M\′-1)M\′}^n& F_{(2M\′-1)(M\′+1)}^n& \·\·\·& F_{(2M\′-1)(2M\′)}^n\\ F_{(2M\′)1}^n& \·\·\·& F_{(2M\′)M\′}^n& F_{(2M\′)(M\′+1)}^n& \·\·\·& F_{(2M\′)(2M\′)}^n\end{array}\right]}_{M\×L}---\left(4\right)$

Wherein,

By Negate and obtain.

F ⁿRepresent a ZCZ sign indicating number collection, F (L, M, Z _CZ)=F (2 ^2n+m+1, 2 ^N+1, 2 ^N+m+ 1), its code word number is M, and code length is L, and zero correlation window length is Z _CZ=min{Z _ACZ, Z _CCZ, Z _ACZAnd Z _CCZRepresent auto-correlation zero district and cross-correlation zero district respectively.

When marking code (Code ID) index of Zero Correlation Zone sequence with

To at once, the Code ID index of ZeroCorrelation Zone sequence with

Relation as shown in table 4, table 4 be Code ID index with

Corresponding relation.

Table 4

Step 401: the definite mapping position of synchronizing signal on frequency direction that constitutes by the synchronizing sequence that generates.

In this step, the base station is identical or different to master sync signal mapping position on frequency direction of terminal links in mapping position on the frequency direction and base station to the synchronizing signal of via node link.

When the base station to the synchronizing signal of via node link in mapping position on the frequency direction and base station to the master sync signal of terminal links when mapping position is identical on frequency direction; specific implementation is: be mapped in (promptly to be total to the band width of 1.08MHz on each 540kHz frequency location about the midbandwidth symmetry; totally 72 subcarriers), Far Left and rightmost 5 carrier waves do not carry any data as the protection subcarrier and in 72 subcarriers.

When the base station to the synchronizing signal of via node link in mapping position on the frequency direction and base station to the master sync signal of terminal links on frequency direction mapping position not simultaneously, specific implementation is:

Be mapped in on each (m/2) * 180kHz frequency location about the midbandwidth symmetry, wherein, (m/2) * 180kHz represents the band width of m/2 RB, the band width of common m RB, i.e. and m*180kHz, wherein m is a positive integer;

Perhaps, be mapped in not on the frequency location with the midbandwidth symmetry, the band width of m RB altogether, i.e. m*180kHz, wherein m is a positive integer, describedly can not fix with the frequency location of midbandwidth symmetry, or can not fix.

Step 402: the definite mapping position of synchronizing signal on time orientation that constitutes by the synchronizing sequence that generates.

In this step, the mapping that specifically comprises on radio frames, subframe, the OFDM symbol is being shone upon to the synchronizing signal of via node link in the base station on the time orientation.

Wherein, the base station is different to the subframe of the master sync signal mapping of terminal links with the base station to the subframe of the synchronizing signal mapping of via node link, described base station is R-PSS-SF ∈ { RF|SFN mod n=0} to the satisfied condition of subframe of the synchronizing signal mapping of via node link, represent that promptly the base station belongs to the radio frames of base station to the synchronizing signal mapping of via node link to the subframe of the synchronizing signal mapping of via node link, wherein R-PSS-SF represents R-PSS place subframe, RF represents R-PSS place radio frames, SFN represents System Frame Number (systemframe number), n represents that the base station arrives the wireless frame period of the synchronizing signal mapping of via node link, and n is a positive integer; Mod represents complementation.

Wherein, R-PSS-SF can be chosen in a public back haul link subframe (backhaulsubframe) of all via nodes or be chosen in non-public back haul link subframe, that is to say, be chosen in via node the 1st or last 1 or any one back haul link subframe separately.

The base station comprises to the mapping of synchronizing signal on the OFDM symbol of via node link:

When FDD and the identical OFDM character position of TDD system employing, preferably, the base station is mapped in the 1st OFDM of inverse of the 1st slot among the R-PSS-SF to the synchronizing signal of via node link.

When FDD and the different OFDM character position of TDD system employing, preferably, for the FDD system, the base station is mapped in the 1st OFDM of inverse of the 1st slot among the R-PSS-SF to the synchronizing signal of via node link; For the TDD system, the base station is mapped in the 1st OFDM of inverse of the 2nd slot among the R-PSS-SF to the synchronizing signal of via node link, and perhaps, the TDD system base-station is mapped among the R-PSS-SF in the 3rd OFDM to the synchronizing signal of via node link.

Need to prove, can the part sequencing between step 401 and the step 402.

From the inventive method shown in Figure 4 as seen, the inventive method is applicable to that well the base station arrives the back haul link between via node, the synchronizing signal mapping mode is simple, both guaranteed backwards compatibility (compatible LTE system), also solved the correct PSS that issues from the base station, the problem of SSS of receiving of via node, adopt low expense, guaranteed that simultaneously via node normally finishes tracking work.

Fig. 5 as shown in Figure 5, comprises synchronizing sequence generation module, first mapping block and second mapping block for the composition structural representation of the synchronizing signal mapping device of repeated link of the present invention, wherein,

The synchronizing sequence generation module is used to generate the synchronizing sequence of the back haul link between base station and via node, and the synchronizing sequence that generates is exported to first mapping block and second mapping block.

First mapping block is used for the definite mapping position of synchronizing signal on frequency direction that is made of the synchronizing sequence that generates.

Second mapping block is used for the definite mapping position of synchronizing signal on time orientation that is made of the synchronizing sequence that generates.

Below in conjunction with several embodiment the inventive method is elaborated.

Fig. 6 is the schematic diagram of the embodiment of the R-PSS that is the cycle with 32 radio frames, as shown in Figure 6, be that to launch R-PSS the cycle be example with 32 radio frames in the present embodiment, according to the inventive method, the base station is { in the RF|SFN mod 32=0} radio frames, such as can emission R-PSS in #0, #32, #64, #96 (not shown among Fig. 6) radio frames, the radio frames of representing to carry R-PSS as dark-shaded lattice among Fig. 6.Wherein RF represents R-PSS place radio frames, and SFN represents System Frame Number, and these R-PSS are used for RN to be followed the tracks of synchronously, simultaneously also further beared information.

The R-PSS that Fig. 7 is is the cycle with 64 radio frames, the schematic diagram of the embodiment of public back haul link subframe carrying R-PSS, as shown in Figure 7, be the cycle to launch R-PSS with 64 radio frames in the present embodiment, and be to be example with public back haul link subframe carrying R-PSS, so, according to the inventive method, the base station is { in the RF|SFN mod 64=0} radio frames, such as also can launching R-PSS in #0, #64, #128, #192 (not shown among Fig. 7) radio frames, the radio frames of representing to carry R-PSS as dark-shaded lattice among Fig. 7.Wherein, RF represents R-PSS place radio frames, and SFN represents System Frame Number.

And in radio frames, the subframe of specifically carrying R-PSS is chosen in public back haul link subframe, such as the base station in { emission R-PSS in the #2 subframe of RF|SFN mod 64=0} radio frames, the subframe of representing to carry R-PSS as dark left diagonal line hatches lattice among Fig. 7.These R-PSS are used for RN to be followed the tracks of synchronously, simultaneously can also further beared information.

The R-PSS that Fig. 8 is is the cycle with 64 radio frames, the schematic diagram of the embodiment of non-public back haul link subframe carrying R-PSS, as shown in Figure 8, be the cycle to launch R-PSS with 64 radio frames in the present embodiment, and be to be example with non-public back haul link subframe carrying R-PSS, so, according to the inventive method, the base station is { in the RF|SFN mod 64=0} radio frames, also can launch R-PSS such as #0, #64, #128, #192 (not shown among Fig. 8) radio frames, the radio frames of representing to carry R-PSS as dark-shaded lattice among Fig. 8.Wherein, RF represents R-PSS place radio frames, and SFN represents System Frame Number.

And in radio frames, the subframe of concrete carrying R-PSS is chosen in non-public back haul link subframe, such as the base station in { emission R-PSS in the #2 of RF|SFN mod 64=0} radio frames or the #8 subframe, the subframe of representing to carry R-PSS as dark left diagonal line hatches lattice among Fig. 8.These R-PSS are used for RN to be followed the tracks of synchronously, simultaneously can also further beared information.

Fig. 9 is that FDD adopts different OFDM symbols carry R-PSS with the TDD system, with the schematic diagram of the embodiment of the band width of totally 6 RB on the frequency location of midbandwidth symmetry, as shown in Figure 9, it is example that present embodiment adopts different OFDM symbols carry R-PSS with FDD with the TDD system, dash area represents to carry R-PSS among Fig. 9, abscissa direction indication time domain (time domain), ordinate direction indication frequency domain (frequency domain).Specifically, for the FDD system, the base station is mapped in the 1st OFDM of inverse of the 1st slot among the R-PSS-SF to the synchronizing signal of via node link; For the TDD system, the base station is mapped in the 1st OFDM of inverse of the 2nd slot among the R-PSS-SF to the synchronizing signal of via node link, perhaps is mapped among the R-PSS-SF in the 3rd OFDM; Frequency direction is mapped in on the frequency location of midbandwidth symmetry on the band width of 6 RB totally.

Figure 10 is that FDD adopts identical OFDM symbols carry R-PSS with the TDD system, with the schematic diagram of the embodiment of the band width of totally 6 RB on the frequency location of midbandwidth symmetry, as shown in figure 10, it is example that present embodiment adopts identical OFDM symbols carry R-PSS with FDD with the TDD system, dash area represents to carry R-PSS among Figure 10, abscissa direction indication time domain (time domain), ordinate direction indication frequency domain (frequency domain).Specifically, the base station is mapped in the 1st OFDM of inverse of the 1st slot among the R-PSS-SF to the synchronizing signal of via node link; Frequency direction is mapped in on the frequency location of midbandwidth symmetry on the band width of 6 RB totally.

Figure 11 is that FDD adopts identical OFDM symbols carry R-PSS with the TDD system, not with the schematic diagram of the embodiment of the band width of totally 3 RB on the frequency location of midbandwidth symmetry, as shown in figure 11, it is example that present embodiment adopts identical OFDM symbols carry R-PSS with FDD with the TDD system, dash area represents to carry R-PSS among Figure 11, abscissa direction indication time domain (time domain), ordinate direction indication frequency domain (frequency domain).Specifically, the base station is mapped in the 1st OFDM of inverse of the 1st slot among the R-PSS-SF to the synchronizing signal of via node link; Frequency direction is mapped in not with on the frequency location of midbandwidth symmetry on the band width of 3 RB (3 lattices representing as dash area among the figure) totally.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (17)

1. the synchronizing signal mapping method of a repeated link is characterized in that, this method comprises:

Generate the synchronizing sequence of the back haul link between base station and via node;

The definite mapping position of synchronizing signal on frequency direction that is made of the synchronizing sequence that generates determined the mapping position of synchronizing signal on time orientation that is made of the synchronizing sequence that generates.

2. synchronizing signal mapping method according to claim 1 is characterized in that, described generation synchronizing sequence comprises: described synchronizing signal is made of frequency domain Zadoff-Chu sequence, the root sequence index u of Zadoff-Chu sequence with Correspondence, wherein

Physical Cell Identifier PCID in the expression group.

3. synchronizing signal mapping method according to claim 1 is characterized in that, described generation synchronizing sequence comprises: described synchronizing signal is made of time domain Zadoff-Chu sequence, the root sequence index u of Zadoff-Chu sequence with

Correspondence, perhaps the root sequence index u of Zadoff-Chu sequence with It doesn't matter, wherein Physical Cell Identifier PCID in the expression group.

4. synchronizing signal mapping method according to claim 1 is characterized in that, described generation synchronizing sequence comprises: described synchronizing signal is made of frequency domain Zero Correlation Zone sequence, the Code ID index of Zero CorrelationZone sequence with

Correspondence, perhaps the Code ID index of Zero Correlation Zone sequence with It doesn't matter, wherein

Physical Cell Identifier PCID in the expression group.

5. synchronizing signal mapping method according to claim 1 is characterized in that, described generation synchronizing sequence comprises: described synchronizing signal is made of time domain Zero Correlation Zone sequence, the Code ID index of Zero CorrelationZone sequence with

Correspondence, perhaps the Code ID index of Zero Correlation Zone sequence with

It doesn't matter, wherein

Physical Cell Identifier PCID in the expression group.

6. according to each described synchronizing signal mapping method of claim 2～5, it is characterized in that, if the CodeID index of the root sequence index u of described Zadoff-Chu sequence or described Zero Correlation Zone sequence, with

Correspondence, this method further comprises:

When described via node was followed the tracks of, it was right only to need

Corresponding sequence is made related operation.

7. according to each described synchronizing signal mapping method of claim 2～5, it is characterized in that, if the CodeID index of the root sequence index u of described Zadoff-Chu sequence or described Zero Correlation Zone sequence, with

It doesn't matter, and this method further comprises:

By the different synchronizing signal beared information of described base station to the via node link.

8. synchronizing signal mapping method according to claim 7 is characterized in that, described information is the distinctive public information of described via node.

9. according to claim 2 or 3 described synchronizing signal mapping methods, it is characterized in that, when described method is applied to Long Term Evolution LTE system or senior Long Term Evolution LTE-A system,

If described synchronizing signal is made of frequency domain or time domain Zadoff-Chu sequence, described Zadoff-Chu sequence d _u(n) be shown below:

$d_u\left(n\right)=\left\{\begin{array}{cc}{e}^{-j\frac{\mathrm{\πun}(n+1)}{63}}& n=\mathrm{0,1},...,30\\ e^{-j\frac{\mathrm{\πu}(n+1)(n+2)}{63}}& n=\mathrm{31,32},...,61\end{array}\right.$ Wherein, n is a numerical index in the sequence;

If the root sequence index u of described Zadoff-Chu sequence with

Correspondence, its corresponding relation are 25 corresponding with 0, and 29 is corresponding with 1, and 34 is corresponding with 2.

10. according to claim 4 or 5 described synchronizing signal mapping methods, it is characterized in that, when described method is applied to LTE system or LTE-A system,

If described synchronizing signal is made of frequency domain or time domain Zero Correlation Zone sequence, described ZeroCorrelation Zone sequence F ⁿBe shown below:

$F^n={\left[\begin{array}{cccccc}{F}_{11}^n& \·\·\·& F_{1M\′}^n& F_{1(M\′+1)}^n& \·\·\·& F_{1(2M\′)}^n\\ F_{21}^n& \·\·\·& F_{2M\′}^n& F_{2(M\′+1)}^n& \·\·\·& F_{2(2M\′)}^n\\ \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·\\ \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·& \·\·\·\\ F_{(2M\′-1)1}^n& \·\·\·& F_{(2M\′-1)M\′}^n& F_{(2M\′-1)(M\′+1)}^n& \·\·\·& F_{(2M\′-1)(2M\′)}^n\\ F_{(2M\′)1}^n& \·\·\·& F_{(2M\′)M\′}^n& F_{(2M\′)(M\′+1)}^n& \·\·\·& F_{(2M\′)(2M\′)}^n\end{array}\right]}_{M\×L}$ Wherein,

$\begin{array}{c}M=2\×M\′\\ F_{i1}^n=F_{i1}^{n-1}{F}_{i1}^{n-1},\·\·\·,F_{\mathrm{iM}\′}^n=F_{\mathrm{iM}\′}^{n-1}{F}_{\mathrm{iM}\′}^{n-1}\\ F_{i(1+M\′)}^n=(-F_{i1}^{n-1})F_{i1}^{n-1},\·\·\·,F_{i(2M\′)}^n\\ F_{(i+M\′)1}^n=F_{i(1+M\′)}^n,...,F_{(i+M\′)M\′}^n=F_{i(2M\′)}^n\\ F_{(i+M\′)(1+M\′)}^n=F_{i1}^n,...,F_{(i+M\′)(2M\′)}^n=F_{\mathrm{iM}\′}^n\end{array}=(-F_{\mathrm{iM}}^{n-1})F_{\mathrm{iM}}^{n-1},$

By

Negate and obtain;

F ⁿRepresent a ZCZ sign indicating number collection, F (L, M, Z _CZ)=F (2 ^2n+m+1, 2 ^N+1, 2 ^N+m+ 1), its code word number is M, and code length is L, and zero correlation window length is Z _CZ=min{Z _ACA, Z _CCZ, Z _ACZAnd Z _CCZRepresent auto-correlation zero district and cross-correlation zero district respectively;

If the Code ID index of described Zero Correlation Zone sequence with

Correspondence, its corresponding relation are 00 corresponding with 0, and 01 is corresponding with 1, and 10 is corresponding with 2.

11. synchronizing signal mapping method according to claim 1 is characterized in that, the described definite mapping position of described synchronizing signal on frequency direction comprises:

Described synchronizing signal is mapped in, and on each 540kHz frequency location about the midbandwidth symmetry, and Far Left and rightmost 5 carrier waves do not carry any data as the protection subcarrier in 72 subcarriers.

12. synchronizing signal mapping method according to claim 1 is characterized in that, the described definite mapping position of described synchronizing signal on frequency direction comprises:

Described synchronizing signal is mapped in, and on each (m/2) * 180kHz frequency location about the midbandwidth symmetry, wherein, (m/2) * 180kHz represents the band width of m/2 Resource Block RB, the band width of common m RB, i.e. and m*180kHz, wherein m is a positive integer.

13. synchronizing signal mapping method according to claim 1 is characterized in that, the described definite mapping position of described synchronizing signal on frequency direction comprises:

Described synchronizing signal is mapped in, on the frequency location with the midbandwidth symmetry, and the band width of m RB altogether, i.e. m*180kHz, wherein m is a positive integer, describedly can not fix with the frequency location of midbandwidth symmetry, or can not fix.

14. synchronizing signal mapping method according to claim 1 is characterized in that, the described definite mapping position of described synchronizing signal on time orientation comprises:

Satisfy to the subframe of the synchronizing signal mapping of via node link described base station:

R-PSS-SF ∈ { RF|SFN mod n=0}, wherein R-PSS-SF represents described synchronizing signal place subframe, RF represents described synchronizing signal place radio frames, and SFN is a System Frame Number, and n represents that the base station is a positive integer to the wireless frame period and the n of the synchronizing signal mapping of via node link; Mod represents complementation.

15. synchronizing signal mapping method according to claim 14 is characterized in that, described R-PSS-SF is the public back haul link subframe of of all via nodes, perhaps is non-public back haul link subframe.

16. synchronizing signal mapping method according to claim 15 is characterized in that, the described definite mapping position of described synchronizing signal on time orientation comprises:

When FDD adopted identical orthogonal frequency division multiplex OFDM character position with TDD system, described synchronizing signal was mapped in the 1st OFDM of inverse of the 1st time slot among the described R-PSS-SF;

When FDD adopts different OFDM character positions with the TDD system,

For the FDD system, described synchronizing signal is mapped in the 1st OFDM of inverse of the 1st time slot among the described R-PSS-SF;

For the TDD system, described synchronizing signal is mapped in the 1st OFDM of inverse of the 2nd time slot among the described R-PSS-SF, perhaps is mapped among the described R-PSS-SF in the 3rd OFDM.

17. the synchronizing signal mapping device of a repeated link is characterized in that, comprises synchronizing sequence generation module, first mapping block and second mapping block, wherein,

The synchronizing sequence generation module is used to generate the synchronizing sequence of the back haul link between base station and via node, and the synchronizing sequence that generates is exported to first mapping block and second mapping block;

First mapping block is used for the definite mapping position of synchronizing signal on frequency direction that is made of the synchronizing sequence that generates;

Second mapping block is used for the definite mapping position of synchronizing signal on time orientation that is made of the synchronizing sequence that generates.

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