CN101267226B - An information sending method for auxiliary synchronization channel and cell search method - Google Patents

An information sending method for auxiliary synchronization channel and cell search method Download PDF

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Publication number
CN101267226B
CN101267226B CN200710086825XA CN200710086825A CN101267226B CN 101267226 B CN101267226 B CN 101267226B CN 200710086825X A CN200710086825X A CN 200710086825XA CN 200710086825 A CN200710086825 A CN 200710086825A CN 101267226 B CN101267226 B CN 101267226B
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sch
sub
psc
district
ssc
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CN200710086825XA
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CN101267226A (en
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喻斌
刘虎
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J11/00Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0076Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group

Abstract

The present invention provides an information transmitting method of an auxiliary synchronous channel and a small area searching method applied in an LTE system. An E-NodeB generates a binary system sequence of the auxiliary information necessary for the small area searching which is required to be transmitted on the small area S-SCH. The binary system sequence is executed with channel coding and modulating for generating an auxiliary synchronous code SSC. According to the frequency division multiplexing S-SCH subcarrier mapping pattern of the small area, the generated SSC symbol is mapped on the corresponding subcarrier. Afterwards through the modulation of the orthogonal frequency division multiplexing OFDM, the auxiliary synchronizing signal is obtained and is transmitted on the frequency division multiplexing S-SCH. A terminal searches on the network and executes a relativity test to three PSCs transmitted on P-SCH and obtains the PSC of the target small area. Furthermore the mapping pattern of the SSC subcarrier of the target small area is obtained. The channel estimation of S-SCH test is executed with the PSC. The auxiliary information required for the searching of the small area is obtained after demodulating and decoding. The invention can increase the capability of the small area searching.

Description

A kind of method for sending information of auxiliary synchronization channel and small region search method

Technical field

The present invention relates to field of wireless communication, particularly relate to method for sending information and small region search method based on the GSM auxiliary synchronization channel of orthogonal frequency division multiplexi (OFDM).

Background technology

When portable terminal (UE also abbreviates the terminal as in the literary composition) is started shooting or lose the network service, need come capture systems through initial acquisition process, acquisition procedure is also referred to as cell search process.Capture systems means and identifies the Target cell that portable terminal inserts, and demodulates the system information in the broadcast channel, mainly is time and the Frequency Synchronization that obtains with Target cell, also obtains Target Cell Identifier number and some sub-district characteristic informations simultaneously.For 3G (Third Generation) Moblie long evolving system (LTE) based on the OFDM technology; Cell search process mainly is that synchronizing channel (Synchronization Channel is passed through at the terminal; SCH), and reference signal (Reference Symbol, RS) and broadcast channel (Broadcast Channel; BCH) obtain necessary timing and Frequency Synchronization, complete Cell Identity CI and sub-district/system-specific information etc.

As a rule, cell search process is the process of a classification, therefore, corresponding synchronizing channel (SCH) be divided into primary synchronization channel (Primary SCH, P-SCH) and auxiliary synchronization channel (SecondarySCH, S-SCH).For the 3GPP-LTE system; Carry Primary Synchronisation Code (Primary SynchronizationCode; PSC) P-SCH is mainly used in symbol and regularly obtains (symbol timing acquisition; Just so-called 5ms subframe is regularly synchronously) and frequency calibration, can also be provided for the channel estimating that demodulation is embedded in the sub-district particular message in the auxiliary synchronization channel.Carry auxiliary synchronous code (SecondarySynchronization Code; SSC) S-SCH then mainly is used for realizing radio frames regularly synchronous and Cell Identity CI (Cell ID) or cell group identification number (Group Cell ID) and some sub-district certain relevant detection of information; Transmitting antenna configuration like BCH; Cyclic Prefix (Cyclic Prefix, CP) information such as length.If through S-SCH, only obtain cell group identification number, will obtain Cell Identity CI through the reference signal that synchronizing channel belongs to frame.Certainly, through different methods for designing, specifically through P-SCH, which information S-SCH carries respectively with RS can be different.The expectation benchmark of small region search method design mainly is quick and precisely to obtain, low expense, and simple signal processing and low terminal complexity, and support synchronous and asynchronous operation.Therefore, P-SCH, S-SCH and RS go up delivery plan design demand balance Cell searching performance, overhead and the complexity of synchronizing information and sub-district characteristic information.

The transmission of the cell search process information needed of LTE system realizes being based on P-SCH, and S-SCH and RS design, and needs to consider earlier P-SCH and the multiplex mode TDM of S-SCH in frame structure, position and sending method.Fig. 1 and Fig. 2 are respectively that time slot is that the tdd frame structure of 0.675ms and the synchronizing channel of FDD frame structure are sent sketch map in the current LTE system.As can beappreciated from fig. 1, for the LTE-TDD system that adopts the 0.675ms time slot, P-SCH and S-SCH adopt the mode of Time Division Multiplexing, and every 10ms radio frames is sent twice.P-SCH is fixed on descending pilot frequency time slot (DwPTS) and go up sends, and S-SCH is fixed on last OFDM symbol of time slot 0 (TS0) and sends.As can beappreciated from fig. 2, for the LTE-FDD system, each radio frames (Radio Frame) is 10ms, comprises 2 5ms subframes and 20 0.5ms subframes.The every 5ms of P-SCH and S-SCH sends once, adopts the TDM multiplex mode, and last the OFDM symbol and the penult OFDM that are placed on first 0.5ms subframe respectively go up transmission.

Synchronizing channel delivery plan illustrated in figures 1 and 2, S-SCH are compared with public guide frequency near the position of P-SCH; Primary Synchronisation Code PSC has higher energy and density; Can good channel estimating be provided for S-SCH goes up the auxiliary synchronous signal SSC that sends, therefore, in the cell search process of LTE; The demodulation of S-SCH can be adopted relevant and non-coherent demodulation; But the non-coherent demodulation performance is poor slightly, and therefore, the main auxiliary synchronous code delivery plan that current 3GPP discusses all is to utilize PSC to do the channel estimating of S-SCH coherent demodulation.But consider in synchronizing network; If system only adopts the PSC of a sub-district shared (Cell-Common) to do regularly and Frequency Synchronization; Because the equivalent multipath synchronizing channel stack of a plurality of neighbor cells; Under big radius of society, possibly cause regularly imbalance (timing mismatch), the channel estimating of utilizing Cell-Common PSC to do in this case is not quite accurate, and the Cell searching performance can reduce a lot.So; In the 3GPP RAN1#47bis meeting that Italian Sorrento holds, passed through the proposal that system can adopt 3 Primary Synchronisation Codes, can make neighbor cell use different PSC through the planning of arranging net; As shown in Figure 3; Thereby channel estimating more accurately is provided for S-SCH coherent demodulation, and can assists reference signal to detect CellID, reduce the time of Cell searching.

For the LTE system, the information that the auxiliary synchronous signal that on S-SCH, sends in most of member company expectation initial cell process of 3GPP carries is as shown in table 1:

Table 1

Because the auxiliary synchronization channel of LTE system only transmits an OFDM symbol, bandwidth settings only comprises 76 number of sub-carrier (Sub-carriers) for having only 1.25MHz, but wants to detect at least 1360 kinds of supposition (Hypotheses).So; If adopt LTE system image width tape code division multiple access system (WCDMA) such design SSC characteristic sequence of OFDM technology and transmit the sub-district particular message; Can information transmitted amount be extremely limited; For example, only adopt original Zadoff-Chu sequence to transmit the information of S-SCH, can only transmit 76 supposition at most.So in the cell search process of LTE system; How to design a kind of reliable and low method for sending information of complexity; Make on the S-SCH of 1.25MHz bandwidth, can transmit the needed auxiliary synchronization channel information of abundant cell search process, to improve the Cell searching performance.

Summary of the invention

The technical problem that the present invention will solve provides a kind of method for sending information based on auxiliary synchronization channel in the 3G (Third Generation) Moblie long evolving system of OFDM technology, to improve the performance of Cell searching.

In order to address the above problem, the present invention proposes a kind of method for sending information of auxiliary synchronization channel, be applied to 3G (Third Generation) Moblie long evolving system based on orthogonal frequency division multiplexi, i.e. LTE system, this method may further comprise the steps:

(a) the LTE system base-station generates the binary sequence that sub-district auxiliary synchronization channel S-SCH goes up the required supplementary of Cell searching that needs transmission;

(b) said binary sequence is carried out chnnel coding and modulation, generate auxiliary synchronous code SSC;

(c) according to the frequency division multiplexing S-SCH subcarrier of sub-district mapping pattern, with the SSC sign map that generates to corresponding subcarrier;

(d) obtain auxiliary synchronous signal through modulating in OFDM, and on frequency division multiplexing S-SCH, send.

Further, said method also can have following characteristics:

The required supplementary of said Cell searching in the step (a) comprises synchronizing information and sub-district characteristic information.

Further, said method also can have following characteristics:

The binary sequence that has generated a 11bits in the step (a) carries said synchronizing information and sub-district characteristic information.

Further, said method also can have following characteristics:

In the step (b) be to the binary sequence of 11bits adopt that code check is 1/3, limited length is 6 convolution code CC (3; 1; 5) carry out the FEC coding, perhaps adopt linear block codes Reed Muller (48,11) to carry out the FEC coding; Obtain the binary sequence that length is 48bits, symbol lengths of modulation generation is 24 SSC sequence again.

Further, said method also can have following characteristics:

The SSC sign map that each neighbor cell generates in the step (c) is on different subcarriers.

Further, said method also can have following characteristics:

System is provided with the frequency division multiplexing S-SCH subcarrier mapping pattern of sub-district through following method: design at least 3 PSC earlier; Be each cell setting PSC then, and guarantee that the PSC of neighbor cell is different; Adopt the distributed mapping method that the sub-carrier intercrossed average mark on the S-SCH bandwidth is divided into 3 groups of subcarriers, set up the sub carrier group of each sub-district use and the corresponding relation of this sub-district PSC then, be kept among terminal and the E-NodeB;

In the step (c), be corresponding relation, confirm the frequency division multiplexing S-SCH subcarrier mapping pattern of sub-district according to sub-district PSC and sub carrier group.

Another technical problem that the present invention will solve provides a kind of small region search method based on the technological 3G (Third Generation) Moblie long evolving system of OFDM, can improve the performance of Cell searching.

In order to address the above problem, the present invention proposes a kind of small region search method, be applied to 3G (Third Generation) Moblie long evolving system based on orthogonal frequency division multiplexi, i.e. LTE system, this method may further comprise the steps:

(A) starting up of terminal, search network is gone up 3 Primary Synchronisation Code PSC that send to the primary synchronization channel P-SCH of system and is done correlation detection, the PSC of acquisition Target cell and symbol timing, frequency offset estimated information;

(B) the LTE system base-station adopts frequency division multiplexing auxiliary synchronization channel S-SCH to send the SSC that combined coding modulation binary sequence generates, and this sequence is carried the required supplementary of Cell searching; The terminal is according to PSC and the PSC of preservation and the corresponding relation of S-SCH subcarrier mapping pattern of Target cell; Obtain the mapping pattern of Target cell auxiliary synchronous code SSC subcarrier; Utilize PSC to do the channel estimating that S-SCH detects, separate again to be in harmonious proportion and decipher the required supplementary of Cell searching that obtains the binary sequence form;

(C) confirm Target Cell Identifier number according to the reference signal of synchronizing channel place subframe and said supplementary, and read broadcast channel, accomplish cell search process.

Further, said method also can have following characteristics:

The SSC that the LTE system base-station adopts frequency division multiplexing auxiliary synchronization channel S-SCH to send the generation of combined coding modulation binary sequence in the step (B) accomplishes through following steps:

(B1) the LTE system base-station generates the binary sequence that sub-district auxiliary synchronization channel S-SCH goes up the required supplementary of Cell searching that needs transmission;

(B2) said binary sequence is carried out chnnel coding and modulation, generate auxiliary synchronous code SSC;

(B3) according to the frequency division multiplexing S-SCH subcarrier of sub-district mapping pattern, with the SSC sign map that generates to corresponding subcarrier;

(B4) obtain auxiliary synchronous signal through modulating in OFDM, and on frequency division multiplexing S-SCH, send.

Further, said method also can have following characteristics:

In the step (B), if synchronizing channel place subframe does not have the length of fixed cycles prefix CP, before carrying out the S-SCH demodulation, the blind Detecting that CP length also need be carried out in the terminal obtains the accurate locating information of S-SCH.

Further, said method also can have following characteristics:

The corresponding relation of PSC that preserve at the terminal and S-SCH subcarrier mapping pattern is provided with according to following mode: design at least 3 PSC earlier; Be each cell setting PSC then, and guarantee that the PSC of neighbor cell is different; Adopt the distributed mapping method that the sub-carrier intercrossed average mark on the S-SCH bandwidth is divided into 3 groups of subcarriers, set up the sub carrier group of each sub-district use and the corresponding relation of this sub-district PSC then, be kept among terminal and the E-NodeB.

Further, said method also can have following characteristics:

The required supplementary of said Cell searching comprises: cell group identification number, broadcast channel transmit antenna configuration information, radio frames regularly and the indication of downlink reference signal frequency hopping, the binary sequence that has generated a 11bits in the step (B1) carries above-mentioned information.

Compared with prior art; The present invention is applicable to the LTE system of FDD and two kinds of duplex modes of TDD, has improved the transmission of S-SCH information and has detected performance, and only needed common modulation and coding techniques; Without the processing feature sequence; So, compare with other S-SCH information sender case, reduced the complexity of terminal equipment.

The figure explanation

Fig. 1 is that time slot is the sending method sketch map of synchronizing channel in the LTE-TDD system of 0.675ms in the prior art.

Fig. 2 is the sending method sketch map of synchronizing channel in the prior art LTE-FDD system.

Fig. 3 is a sub-district Primary Synchronisation Code network planning sketch map in the prior art.

Fig. 4 is an auxiliary synchronization channel frequency division multiplexing sketch map among the embodiment.

Fig. 5 is that the information of the auxiliary synchronization channel among the embodiment is sent sketch map.

Fig. 6 is the classification small region search method sketch map among the embodiment.

Fig. 7 is encoder for convolution codes CC (3,1, the 5) sketch map of 1/3 code check among the embodiment.

Embodiment

The present invention relates to 3GPP 3G (Third Generation) Moblie long evolving system (3GPP-LTE comprises time division duplex and frequency division duplex system) small region search method and on S-SCH, send in the cell search process required synchronously and the method for sub-district characteristic information.This search procedure is sent structure based on the definite synchronizing channel that will adopt of LTE-FDD shown in Figure 2, adopts method for sending information of the present invention to send the sub-district particular message.Whole system adopts 3 PSC to obtain sign synchronization and frequency offset compensation, is confirmed the subcarrier mapping pattern of sub-district SSC frequency division multiplexing S-SCH then by the PSC of sub-district.

Specifically describe the present invention below in conjunction with accompanying drawing and embodiment.

The method for sending information of auxiliary synchronization channel S-SCH is as shown in Figure 5 in the cell search process of a kind of LTE system based on orthogonal frequency division multiplexi of present embodiment, may further comprise the steps:

Step 110, LTE system base-station (E-Node B) generates the binary sequence that S-SCH goes up the information that needs transmission;

E-Node B is the information such as the cell group identification the table 1 number (Group CellID) that need detect from S-SCH in the cell search process; Broadcast channel transmit antenna configuration information (AntennaConfiguration for BCH); Radio frames timing (Radio Frame Timing) and downlink reference signal frequency hopping indication (Hopping indicator) are as the general data information processing, and (binary sequence) carries above-mentioned synchronizing information and sub-district characteristic information with common binary sequence.

UE needs to detect at least 1360 kinds of supposition through this SSC in cell search process, comprises 170 kinds of sub-district ID, two kinds of broadcast channel transmitting antenna configurations, and 2 kinds of frequency hoppings with reference signal of radio frames sign are regularly indicated 2 kinds.So, the SSC of the sub-district information of carrying 11 bits (bits) can meet the demands.Then in this step, generate a common binary sequence and carry this 11bits, just 11 sequence.

Step 120 is carried out chnnel coding and is interweaved this binary sequence;

The same with the general data signal; For improve the reliability that sequence is transmitted in wireless channel; Binary sequence is adopted the strong forward error correction coding (FEC) of error correcting capability; Wait like low rate convolutional code (Convolutional coding) and to carry out chnnel coding, and receive the influence of burst error through the further reduction sequence of interweaving.

It is 1/3 that present embodiment adopts code check shown in Figure 7 to the binary sequence of 11bits, and limited length is that 6 convolution code CC (3,1,5) carries out the FEC coding, just can obtain the binary sequence that length is 48bits; Or adopt linear block codes Reed Muller (48,11) to carry out the FEC coding, also obtain the binary sequence that length is 48bits.

Step 130, it is the auxiliary synchronous code SSC of L that the sequence behind the coding is modulated mapping generation symbol lengths;

11 sequences are carried out symbol lengths of combined coding modulation generation be at most 25 SSC sequence.Because according to shown in Figure 4; Is bandwidth that the subcarrier of the S-SCH of 1.25MHz is divided into 3 groups; Whenever at a distance from the mapping of 3 number of sub-carrier once, one group of subcarrier is wherein only used in each sub-district, and other is empty; So each sub-district available subcarrier resource is 25, the SSC symbol lengths L that just carries out the OFDM modulation is at most 25.This mode that is divided into the intersection of 75 number of sub-carrier on 1.25Mhz bandwidth average mark 3 groups of subcarriers; A preferred example when being frequency division multiplexing of the present invention (FDM) SCH; Can guarantee reasonable frequency diversity performance, but adopt other frequency division multiplexing mode also to be fine.

To length is that the binary sequence of 48bits adopts basic phase shift keying modulation systems such as QPSK, can obtain symbol lengths and be 24 SSC sequence.

Step 140 is a S-SCH subcarrier mapping pattern according to the mapping relations of sub-district Primary Synchronisation Code sequence number and frequency division multiplexing S-SCH subcarrier, with said SSC sign map on corresponding sub carrier group;

In order to reduce the interference of neighbor cell SSC; Neighbor cell adopts frequency division multiplexing (FDM) S-SCH; All subcarriers to S-SCH divide into groups, and confirm subcarrier mapping pattern through the network planning, make adjacent sub-district not use identical sub carrier group; Just the SSC sign map of neighbor cell is on the different sub carrier group of S-SCH; Thereby reduced the interference between the sub-district greatly, to guarantee the right demodulation of the sub-district particular message on each sub-district SSC, the example of S-SCH frequency division multiplexing can be with reference to figure 4.SSC preset S-SCH subcarrier mapping pattern during according to the network planning is mapped on the band resource separately.So-called subcarrier mapping pattern has determined which subcarrier the sub-district uses, and adopts each 3 mapping once in the embodiment, and which pattern just equals and divide into groups, and this corresponding relation is predetermined during by the network planning, and E-NodeB and terminal all will be appreciated that this agreement.

According to the mapping relations of sub-district PSC shown in Figure 4 and frequency division multiplexing S-SCH subcarrier, be this symbol lengths that 24 SSC sequence is mapped to sub carrier group and gets on, for example PSC (1) is used in the sub-district, and the sub carrier group that just is mapped to the oblique line mark to SSC gets on.Whenever once, all the other are empty at a distance from the mapping of 3 number of sub-carrier.

Step 150 obtains auxiliary synchronous signal through the OFDM modulation, on S-SCH, sends.

Just add that through FFT (IFFT) (Cyclic Prefix CP) obtains auxiliary synchronous signal to Cyclic Prefix, just can on S-SCH, send through the emitter of E-NodeB through processing such as transmitting filter back.

Wherein the mapping relations of sub-district Primary Synchronisation Code sequence number in the step 140 and frequency division multiplexing S-SCH subcarrier are provided with through system in advance, may further comprise the steps:

1) 3 good Primary Synchronisation Code PSC of design;

The benchmark of design mainly is need have extraordinary correlation properties to do and regularly obtain; Need have waveform that time domain repeats and come the estimated frequency biasing and need smooth frequency domain characteristic that the channel estimating of S-SCH correlation demodulation is provided, for example the Zadoff-Chu sequence of time domain waveform with twice repeat property can satisfy these characteristics.UE does correlation detection to the signal that on P-SCH, receives and obtains these information, comprises the Autocorrelation Detection method, cross-correlation test method and both mixing.

2) choose 3 PSC after, for each cell setting PSC and make that the PSC of neighbor cell is different;

Can adopt method shown in Figure 3 to plan PSC, make that the PSC of neighbor cell is different, help avoiding the equivalent multipath stack of neighbor cell PSC like this, thereby symbol location and channel estimating more accurately are provided.As shown in Figure 3, PSC (1) is used in the oblique line sub-district, and PSC (2) is used in the grid sub-district, and PSC (3) is used in the vertical line sub-district.

3) each PSC is shone upon pattern corresponding to the subcarrier of frequency division multiplexing S-SCH one by one, and this corresponding relation is kept at terminal and E-NodeB.

As shown in Figure 4, the subcarrier on the 1.25MHz bandwidth of S-SCH is divided into 3 groups, adopts the distributed mapping method, SSC symbol of per 3 number of sub-carrier mapping.Set up the corresponding relation of sub carrier group and sub-district PSC, i.e. where sub-district use organizes subcarrier is confirmed that by the PSC of sub-district use is unique the sequence number of available PSC is set up corresponding relation.What used the oblique line sub-district is PSC (1), to should sub-district SSC using the sub carrier group of the oblique line mark of S-SCH; What used the grid sub-district is PSC (2), to should sub-district SSC using the sub carrier group of the grid mark of S-SCH; What used the vertical line sub-district is PSC (3), to should sub-district SSC using the sub carrier group of the vertical line mark of S-SCH.Like this, the SSC of neighbor cell uses different subcarriers group frequency division multiplexing S-SCH, apart from one another by opening, reduces the interference between the sub-district.

The cell search process of end side may further comprise the steps please with reference to Fig. 6:

Step 1, starting up of terminal, search network is at first gone up 3 PSC that send to the P-SCH of LTE-FDD system and is done correlation detection, information such as the PSC of acquisition Target cell and symbol timing, frequency offset estimation;

This step is the timing acquisition methods that GSM adopts usually.

Step 2; E-NodeB adopts frequency division multiplexing SCH to send the SSC that combined coding modulation binary sequence (this sequence is carried the required supplementary of Cell searching) generates; The UE lateral root obtains the mapping pattern of Target cell SSC subcarrier according to PSC sequence number and the PSC of preservation and the corresponding relation of S-SCH subcarrier mapping pattern of this sub-district, utilizes PSC to do the channel estimating that S-SCH detects; Adopt coherent demodulation and FEC decoding, obtain the sub-district characteristic information and the synchronizing information of binary sequence form;

The UE side detects the PSC sign indicating number that uses the sub-district number earlier when detecting S-SCH, just can know the sub carrier group of the S-SCH that use this sub-district, for example detects PSC (1), and this sub-district subcarrier that just obtains the oblique line mark shines upon pattern.

If synchronizing channel place subframe does not have the length of fixation of C P, before carrying out the S-SCH demodulation, the blind Detecting that also need carry out CP length obtains the accurate locating information of S-SCH, shown in Fig. 6 frame of broken lines so.

If what E-Node B adopted when generating SSC is differential modulation, DQPSK for example, UE can also decipher with FEC through non-coherent demodulation obtain sub-district characteristic information and synchronizing information.

Step 3 according to the reference signal of synchronizing channel place subframe, and the cell group identification in the characteristic information of sub-district number, is confirmed Target Cell Identifier CellID, reads broadcast channel according to the sub-district characteristic information that obtains at last, accomplishes cell search process.

Also can combine Primary Synchronisation Code and reference signal to detect CellID together, detect performance to improve Cell ID.Because after knowing the group Cell Identity CI, corresponding 3 CellID of each group Cell Identity CI utilize the reference signal of 3 quadratures can help to detect these 3 cell ID (the work supposition of current 3GPP).Notice that Primary Synchronisation Code PSC also is 3, can identify 3 CellID equally, can improve performance so combine Primary Synchronisation Code and reference signal just to detect together.

In sum; The present invention provides in a kind of LTE cell search process; Combined coding modulation binary sequence (sequence is carried the supplementary that Cell searching needs) generates SSC, and adopts frequency division multiplexing (FDM) auxiliary synchronization channel to send, to reduce the method that neighbor cell SSC disturbs.Be easy to find out that it is similar that the complexity of S-SCH method for sending information of the present invention and small region search method and general data information are sent.

More than introduced LTE-FDD system cell search procedure of the present invention.Those skilled in the art that should be understood that the above is merely preferred embodiment of the present invention, are not to be used for limiting practical range of the present invention; Everyly do equivalence according to the present invention and change and revise, all contained by claim of the present invention.

For example, the SSC that the mapping that PSC that designs among the embodiment and subcarrier divide into groups is sent neighbor cell is a kind of preferable example on the different subcarriers group, is in order to realize that whole S-SCH goes up the transmission of information.Also can adopt other frequency division multiplexing mode.

In addition; With regard to the effect that reaches required for the present invention; The required supplementary of Cell searching of in combined coding modulation binary sequence, carrying might not be 4 kinds of the above-mentioned cell group identification of mentioning etc., also can carry out of Memory, also can reach technique effect of the present invention.

Claims (10)

1. the method for sending information of an auxiliary synchronization channel is applied to the 3G (Third Generation) Moblie long evolving system based on orthogonal frequency division multiplexi, i.e. LTE system, and this method may further comprise the steps:
(a) the LTE system base-station generates the binary sequence that sub-district auxiliary synchronization channel S-SCH goes up the required supplementary of Cell searching that needs transmission;
(b) said binary sequence is carried out chnnel coding and modulation, generate auxiliary synchronous code SSC;
(c) confirm the S-SCH subcarrier mapping pattern of sub-district through the corresponding relation that sub-district Primary Synchronisation Code and sub carrier group are set, according to said mapping pattern, with the SSC sign map that generates to corresponding subcarrier;
(d) obtain auxiliary synchronous signal through modulating in OFDM, and on frequency division multiplexing S-SCH, send.
2. the method for claim 1 is characterized in that:
The required supplementary of said Cell searching in the step (a) comprises synchronizing information and sub-district characteristic information.
3. method as claimed in claim 2 is characterized in that:
The binary sequence that has generated a 11bits in the step (a) carries said synchronizing information and sub-district characteristic information.
4. method as claimed in claim 3 is characterized in that:
In the step (b) be to the binary sequence of 11bits adopt that code check is 1/3, limited length is 6 convolution code CC (3; 1; 5) carry out the FEC coding, perhaps adopt linear block codes Reed Muller (48,11) to carry out the FEC coding; Obtain the binary sequence that length is 48bits, symbol lengths of modulation generation is 24 SSC sequence again.
5. the method for claim 1 is characterized in that:
The SSC sign map that each neighbor cell generates in the step (c) is on different subcarriers.
6. method as claimed in claim 5 is characterized in that:
System is provided with the frequency division multiplexing S-SCH subcarrier mapping pattern of sub-district through following method: design at least 3 Primary Synchronisation Code PSC earlier; Be each cell setting PSC then, and guarantee that the PSC of neighbor cell is different; Adopt the distributed mapping method that the sub-carrier intercrossed average mark on the S-SCH bandwidth is divided into 3 groups of subcarriers, set up the sub carrier group of each sub-district use and the corresponding relation of this sub-district PSC then, be kept among terminal and the E-NodeB;
In the step (c), be corresponding relation, confirm the frequency division multiplexing S-SCH subcarrier mapping pattern of sub-district according to sub-district PSC and sub carrier group.
7. a small region search method is applied to the 3G (Third Generation) Moblie long evolving system based on orthogonal frequency division multiplexi, i.e. LTE system, and this method may further comprise the steps:
(A) starting up of terminal, search network is gone up 3 Primary Synchronisation Code PSC that send to the primary synchronization channel P-SCH of system and is done correlation detection, the PSC of acquisition Target cell and symbol timing, frequency offset estimated information;
(B) the LTE system base-station adopts frequency division multiplexing auxiliary synchronization channel S-SCH to send the SSC that combined coding modulation binary sequence generates, and this sequence is carried the required supplementary of Cell searching; The terminal is according to PSC and the PSC of preservation and the corresponding relation of S-SCH subcarrier mapping pattern of Target cell; Obtain the mapping pattern of Target cell auxiliary synchronous code SSC subcarrier; Utilize PSC to do the channel estimating that S-SCH detects, separate again to be in harmonious proportion and decipher the required supplementary of Cell searching that obtains the binary sequence form;
(C) confirm Target Cell Identifier number according to the reference signal of synchronizing channel place subframe and said supplementary, and read broadcast channel, accomplish cell search process.
The SSC that the LTE system base-station adopts frequency division multiplexing auxiliary synchronization channel S-SCH to send the generation of combined coding modulation binary sequence in the said step (B) accomplishes through following steps:
(B1) the LTE system base-station generates the binary sequence that sub-district auxiliary synchronization channel S-SCH goes up the required supplementary of Cell searching that needs transmission;
(B2) said binary sequence is carried out chnnel coding and modulation, generate auxiliary synchronous code SSC;
(B3) confirm the S-SCH subcarrier mapping pattern of sub-district through the corresponding relation that sub-district Primary Synchronisation Code and sub carrier group are set, according to said mapping pattern, with the SSC sign map that generates to corresponding subcarrier;
(B4) obtain auxiliary synchronous signal through modulating in OFDM, and on frequency division multiplexing S-SCH, send.
8. method as claimed in claim 7 is characterized in that:
In the step (B), if synchronizing channel place subframe does not have the length of fixed cycles prefix CP, before carrying out the S-SCH demodulation, the blind Detecting that CP length also need be carried out in the terminal obtains the accurate locating information of S-SCH.
9. method as claimed in claim 7 is characterized in that:
The corresponding relation of PSC that preserve at the terminal and S-SCH subcarrier mapping pattern is provided with according to following mode: design at least 3 PSC earlier; Be each cell setting PSC then, and guarantee that the PSC of neighbor cell is different; Adopt the distributed mapping method that the sub-carrier intercrossed average mark on the S-SCH bandwidth is divided into 3 groups of subcarriers, set up the sub carrier group of each sub-district use and the corresponding relation of this sub-district PSC then, be kept among terminal and the E-NodeB.
10. method as claimed in claim 7 is characterized in that:
The required supplementary of said Cell searching comprises: cell group identification number, broadcast channel transmit antenna configuration information, radio frames regularly and the indication of downlink reference signal frequency hopping, the binary sequence that has generated a 11bits in the step (B1) carries above-mentioned information.
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