Method and apparatus for searching a cell
13 claims: 4 independent, 9 dependent
- 1Claims Reivindicações 1 - Downlink Frame Generation Method, characterized by including a first synchronization signal and a second synchronization signal and comprising:1 - Método de Geração de Quadro de Downlink, caracterizado por que inclui um primeiro sinal de sincronização e um segundo sinal de sincronização e por que compreende: generating a first short sequence and a second short sequence that indicate the cell group information;gerar uma primeira sequência curta e uma segunda sequência curta que indicam a informação de grupo de célula;generate a first scrambling sequence determined by the first synchronization signal;gerar uma primeira sequência de scrambling determinada pelo primeiro sinal de sincronização;generate a second scrambling sequence determined by the first short sequence;gerar uma segunda sequência de scrambling determinada pela primeira sequência curta;fazer o scrambling da primeira sequência curta com a primeira sequência de scrambling e fazer o scrambling da segunda sequência curta com pelo menos a segunda sequência de scrambling;e mapear um segundo sinal de sincronização que inclui a primeira sequência curta scrambled e a segunda sequência curta scrambled no domínio da freqüência. scrambling the first short sequence with the first scrambling sequence and scrambling the second short sequence with at least the second scrambling sequence;and mapping a second synchronization signal that includes the first scrambled short sequence and the second scrambled short sequence in the frequency domain.
- 55 - Downlink Frame Generation Device, characterized by including a first synchronization signal and a second synchronization signal and comprising:5 - Dispositivo de Geração de Quadro de Downlink, caracterizado por que inclui um primeiro sinal de sincronização e um segundo sinal de sincronização e por que compreende: a sequence generator for generating a first short sequence and a second short sequence that indicate the cell group information, a first scrambling sequence being determined by the first synchronization signal and a second scrambling sequence being determined by the first short sequence;and a sync signal generator to scramble the first short sequence with the first scrambling sequence, scramble the second short sequence with at least the second scrambling sequence, and generate a second sync signal that includes the first scrambled short sequence and the second scrambled short sequence. um gerador de sequência para gerar uma primeira sequência curta e uma segunda sequência curta que indicam a informação de grupo de célula, sendo uma primeira sequência de scrambling determinada pelo primeiro sinal de sincronização e uma segunda sequência de scrambling determinada pela primeira sequência curta;e um gerador de sinal de sincronização para fazer o scrambling da primeira sequência curta com a primeira sequência de scrambling, fazer o scrambling da segunda sequência curta com pelo menos a segunda sequência de scrambling e gerar um segundo sinal de sincroni3/6 zação que inclui a primeira sequência curta scrambled e a segunda sequência curta scrambled.
- 99 - Recording Media, to record a program for conducting 9 - Mídia de Gravação, para gravar um programa para a realização de 4/6 a method of generating a downlink frame, characterized in that it includes a first synchronization signal and a second synchronization signal, comprising the method:4/6 um método de geração de um quadro de downlink, caracterizado por que inclui um primeiro sinal de sincronização e um segundo sinal de sincronização, compreendendo o método: generating a first short sequence and a second short sequence that indicate the cell group information;gerar uma primeira sequência curta e uma segunda sequência curta que indicam a informação de grupo de célula;generate a first scrambling sequence determined by the first synchronization signal;gerar uma primeira sequência de scrambling determinada pelo primeiro sinal de sincronização;generate a second scrambling sequence determined by the first short sequence;gerar uma segunda sequência de scrambling determinada pela primeira sequência curta;fazer o scrambling da primeira sequência curta com a primeira sequência de scrambling e fazer o scrambling da segunda sequência curta com pelo menos a segunda sequência de scrambling;e mapear um segundo sinal de sincronização que inclui a primeira sequência curta scrambled e a segunda sequência curta scrambled no domínio da frequência. scrambling the first short sequence with the first scrambling sequence and scrambling the second short sequence with at least the second scrambling sequence;and mapping a second synchronization signal that includes the first scrambled short sequence and the second scrambled short sequence in the frequency domain.
- 1313 - Cell Identification Method in Communication System Terminal, in which a plurality of cells is divided into a plurality of groups of cells and each group of cells includes at least two cells, characterized in that it comprises:13 - Método de Identificação de Célula em Terminal de Sistema de Comunicação, em que uma pluralidade de células é dividida numa pluralidade de grupos de células e cada um dos grupos de células inclui pelo menos duas células, caracterizado por que compreende: receber um primeiro sinal de sincronização, sendo o primeiro sinal de sincronização determinado por um número de sequência de identificação de células para identificar uma célula dentro de um grupo de células;e receber um segundo sinal de sincronização, que inclui uma primeira sequência curta scrambled com uma primeira sequência de scrambling e uma segunda sequência curta scrambled com pelo menos uma segunda sequência de scrambling, em que a primeira sequência curta e segunda sequência curta são determinadas por um número de grupo de células para identificação de um grupo de células, a primeira sequência de scrambling depende do primeiro receiving a first synchronization signal, the first synchronization signal being determined by a cell identification sequence number to identify a cell within a group of cells;and receiving a second sync signal, which includes a first scrambled short sequence with a first scrambling sequence and a second scrambled short sequence with at least a second scrambling sequence, where the first short sequence and second short sequence are determined by a cell group number to identify a group of cells, the first scrambling sequence depends on the first 6/6 sinal de sincronização a segunda sequência de scrambling depende da primeira sequência curta e o terminal identifica uma célula com base no número de 5 grupo de células e o número de sequência de identificação de células. 6/6 synchronization signal the second scrambling sequence depends on the first short sequence and the terminal identifies a cell based on the number of cell groups and the cell identification sequence number. 1/7 1/7 110 110
Independent claims4
143 paragraphs, as filed
(54) Title: DOWNLINK TABLE GENERATION DEVICE AND METHOD,
RECORDING MEDIA AND CELL IDENTIFICATION METHOD IN COMMUNICATION SYSTEM TERMINAL (51) Int. Cl .: H04B 7/26 (30) Unionist Priority: 12/07/2007 KR 102007-0070086, 7/12/2007 KR 10-2007007008617 / 08/2007 KR 10-2007-0082678, 12/07/2007 KR 10 -2007-007008617 / 08/2007 KR 10-2007-008267821 / 08/2007 KR 10-20070083916, 12/07/2007 KR 10-2007007008617 / 08/2007 KR 10-2007008267821 / 08/2007 KR 10-2007008391627 / 06 / 2008 KR 10-2008-0061429 (73) Holder (s): ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (72) Inventor (s): KAP SEOK CHANG; IL GYU KIM; HYEONG GEUN PARK; YOUNG JO KO; HYO SEOK Yl; MOON SIK LEE; YOUNG HOON KIM; SEUNG CHAN BANG (74) Attorney (s): HUGO SILVA, ROSA & MALDONADO-PROP INT (86) International Application: PCT KR2008004093 of 11/07/2008 (87) International Publication: WO
2009/008678 of 1/15/2009
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1/23 “Downlink Frame Generation Device and Method,
Recording Media and Cell Identification Method in Communication System Terminal ”
Descriptive Report
Technical Field
The present invention relates to a method of generating downlink frames. and a method for searching cells and, in particular, concerns a method of generating a downlink frame and a method of searching a cell using the downlink frame in a cell system based on orthogonal frequency division multiplexing (OFDM) .
Background Technique
In a direct sequence code division multiple access system (DS-CDMA), the code jump method is applied to a pilot channel in order to obtain cell synchronization and adequate cell identification information. The code skip method introduces a code skip technique on the pilot channel so that a terminal can easily search for the cell without an additional synchronization channel. However, since the number of channels that are distinguishable by the frequency domain in the symbol range is much greater than the number of channels that are distinguishable by spreading CDMA over a time domain symbol range in the OFDM system, use of the time domain can waste resources in relation to capacity and, therefore, it is difficult to apply the code jump method to the time domain of the pilot channel of the OFDM-based system. Therefore, it is desirable, in the case of OFDM, to search for cells using efficiently the signals received in the time domain and in the frequency domain.
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The conventional technique for searching for cells in the OFDM system includes dividing a frame into four blocks of time and allocating synchronization information and cell information. The technique proposes two framework structures. The first frame structure allocates synchronization recognition information, cell group recognition information, appropriate cell recognition information and synchronization recognition information for four blocks of time. The second frame structure allocates synchronization recognition information and appropriate cell recognition information for the first time block and the third time block, and synchronization recognition information and cell group recognition information for the second block of time and for the fourth block of time.
In the case of following the first scheme, since symbol synchronization is achieved in the first block of time, it is impossible to obtain rapid synchronization within the 5 msec standard when a terminal is activated or in the case of a handover (transfer) between networks heterogeneous. In addition, it is difficult to gain diversity by accumulating synchronization recognition information for rapid synchronization.
In the case of following the second scheme, the cell search process is complicated and it is difficult to search for the cells quickly, since it is required to obtain synchronization and simultaneously correlate the appropriate cell recognition information or cell group recognition information , in order to achieve frame synchronization.
Another method for searching for cells using an additional preamble to obtain synchronization and searching for cells has been proposed, but it is inapplicable to a system that has no preamble. In addition, once the preamble is placed on the front of the frame, the terminal
3/23 must be in stand-by for the next frame when trying to get synchronization in a different time position than the first time position in the frame. Particularly, when the terminal performs a handover between GSM mode, WCDMA mode and 3GPP LTE mode, initial symbol synchronization must be obtained within 5 msec, but initial symbol synchronization cannot be achieved within 5 msec , since synchronization can be achieved for each frame.
Detailed Description
Technical problem
The present invention was made in an effort to provide a method for generating downlink frames for medium interference between sectors, as well as an efficient method for searching for cells by receiving downlink frames.
Technical Solution
An exemplary embodiment of the present invention provides a method for generating a downlink frame including a first sync signal and a second sync signal, which includes: generating a first short sequence and a second short sequence to indicate cell group information ; generate a first scrambling sequence (scrambling) determined by the first synchronization signal; generate a second scrambling sequence determined by the first short sequence; scrambling the first short sequence with the first scrambling sequence and scrambling the second short sequence with at least the second scrambling sequence ·, and map a second sync signal that includes the first scrambled short sequence and the second short sequence scrambled in the frequency domain.
Another embodiment of the present invention provides a device for generating a downlink frame including a
4/23 first sync signal and a second sync signal, which includes: a sequence generator to generate a first short sequence and a second short sequence that indicate cell group information, a first scrambling sequence determined by the first signal synchronization and a second scrambling sequence determined by the first short sequence; and a sync signal generator for scrambling the first short sequence with the first scrambling sequence, scrambling the second short sequence with at least the second scrambling sequence and generating a second sync signal that includes the first scrambled short sequence and the second scrambled short sequence.
Yet another embodiment of the present invention provides a recording medium for recording a program for carrying out a method for generating a downlink frame including a first synchronization signal and a second synchronization signal, wherein the method includes: generating a first short sequence and a second short sequence that indicate cell group information; generate a first scrambling sequence determined by the first synchronization signal; generate a second scrambling sequence determined by the first short sequence; scrambling the first short sequence with the first scrambling sequence and scrambling the second short sequence with at least the second scrambling sequence; and mapping a second synchronization signal including the first scrambled short sequence and the second scrambled short sequence in the frequency domain.
Advantageous Effects
In accordance with the present invention, cell search performance is improved by scrambling a short sequence with a scrambling sequence and by reducing interference between sectors.
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Brief Description of Drawings
Figure 1 shows a downlink chart of an OFDM system according to an exemplary embodiment of the present invention.
Figure 2 presents a synchronization channel configuration diagram that indicates a secondary synchronization channel when two sequences are mapped in the frequency domain in a centralized way.
Figure 3 presents a configuration diagram of the synchronization channel which indicates a secondary synchronization channel when two sequences are mapped in the frequency domain in a distributive way.
Figure 4 shows a block diagram of a downlink frame that generates a device according to an exemplary embodiment of the present invention.
Figure 5 presents a flow chart of a downlink frame that generates the method according to an exemplary embodiment of the present invention.
Figure 6 shows a first method for generating a secondary synchronization signal according to an exemplary embodiment of the present invention.
Figure 7 shows a second method for generating a secondary synchronization signal according to an exemplary embodiment of the present invention.
Figure 8 shows a block diagram of a cell search device according to an exemplary embodiment of the present invention.
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Figure 9 shows a flowchart of a method for searching for a cell according to a first exemplary embodiment of the present invention.
Figure 10 shows a flowchart of a method for searching for a cell according to a second exemplary embodiment of the present invention.
Best Mode
In the following detailed description, only a few exemplary embodiments of the present invention have been presented and described, simply by way of illustration. As those skilled in the art would realize, the modalities described can be modified in a number of different ways, all without departing from the spirit or scope of the present invention. In order to clarify the drawings in the present invention, the parts that are not related to the description will be omitted and the same part will have the same reference numeral throughout the specification.
Throughout the specification, unless expressly described to the contrary, the word understand and variations as it understands or understands, will be understood to imply the inclusion of declared elements, but not the exclusion of any other elements. In addition, the expressions a unit, a device and a module in the present specification represent a unit for processing a predetermined function or operation, which can be performed by hardware, software or a combination of hardware and software.
A downlink frame and a synchronization channel of an OFDM system, according to an exemplary embodiment of the present invention, will now be described with reference to Figures 1 to 3.
7/23
Figure 1 shows a downlink chart of an OFDM system according to an exemplary embodiment of the present invention. In Figure 1, the horizontal axis represents the time axis and the vertical axis represents the frequency axis or the axis of a subcarrier.
As shown in Figure 1, a downlink frame 110, according to an exemplary embodiment of the present invention, has a time interval of 10 msec and includes ten subframes 120. A subframe 120 has a time interval of 1 msec and includes two slots (tracks) 130 and a slot 130 includes six or seven OFDM symbols. When a slot includes six symbols, it has a cyclic prefix duration that is longer than the case where a slot includes seven symbols.
As shown in Figure 1, a downlink frame 110, according to an exemplary embodiment of the present invention, includes a synchronization interval 140 in slot 0 and slot 10, respectively, to thus include two synchronization intervals 140. In However, the embodiment of the present invention is not restricted to this. That is, a downlink frame 110 can include a sync interval in a random slot and can include one or at least three sync intervals. In addition, since the duration of the cyclic prefix may be different for each slot, it is desirable to provide the synchronization interval for the last position of the slot.
Each slot includes a pilot range.
A synchronization interval according to an exemplary embodiment of the present invention includes a primary synchronization channel and a secondary synchronization channel, and the primary synchronization channel and the secondary synchronization channel are positioned adjacent with respect to time. As shown in Figure 1, a primary sync channel is provided for the last position of the slot and a secondary sync channel is pro8 / 23 portioned before the primary sync channel.
The primary synchronization channel includes information for the identification of symbol synchronization and frequency synchronization and some cell ID (identification) information and the secondary synchronization channel5 includes information for the identification of other cell ID and synchronization information. of frame. The mobile station identifies the cell ID by combining cell ID information from the primary and secondary synchronization channels.
For example, when there are 510 cell IDs, three primary sync signals are allocated to the primary sync channel to divide all 510 cell IDs into three groups, and when 170 secondary sync signals are allocated to the secondary sync channel , all information from the 510 cell IDs (3x170 = 510) can be expressed.
In addition, it is also possible to divide the 510 cell IDs into 170 groups using the 170 secondary sync signals allocated to the secondary sync channel and express the cell ID information in the cell groups by using the three allocated primary sync signals for the primary sync channel.
Since the secondary synchronization channel includes information to identify frame synchronization, as well as cell ID information, two secondary synchronization channels included in a frame are different.
Figure 2 shows a synchronization channel configuration diagram that indicates a secondary synchronization channel when two sequences are mapped in the frequency domain in a centralized way and Figure 3 shows a synchronization channel configuration diagram that indicates a synchronization channel. synchronization
Secondary 9/23 when two sequences are mapped in the frequency domain in a distributive way.
Referring to Figure 2 and Figure 3, a secondary synchronization signal inserted in a secondary synchronization channel, according to an exemplary embodiment of the present invention, is configured by a combination of two sequences. The cell group information and the frame synchronization information are mapped over the two sequences.
As shown in Figure 2, it is possible to allocate the first sequence to the subcarrier and sequentially allocate the second sequence to the other subcarrier and, as shown in Figure 3, it is possible to allocate the first sequence to each even carrier (n = 0, 2, 4 and ··· 60) and the second sequence for each odd carrier (n = 1, 3, 5 and ·· 61).
The length of the sequence is half the number of subcarriers allocated to the secondary synchronization channel. That is, the number of elements in the sequence that can be generated is as much as half the number of subcarriers allocated to the secondary synchronization channel. For example, when the number of subcarriers allocated to the secondary synchronization channel is 62, the sequence length is 31 and up to 31 elements of the sequence can be generated.
Then, since two streams are allocated to a secondary sync channel, 961 (= 31x31) secondary sync signals are generated. However, since the information to be included by the secondary synchronization channel includes cell group information and frame limit information, 170 or 340 (= 170x2) secondary synchronization signals are required. That is, 961 is sufficiently greater than 170 or 340.
10/23
A downlink frame generation device according to an exemplary embodiment of the present invention will now be described with reference to Figure 4. Figure 4 shows a block diagram of a downlink frame generation device according to an exemplary embodiment of present invention.
As shown in Figure 4, the downlink frame generating device includes a sequence generator 410, a sync signal generator 420, a frequency mapper 430 and an OFDM 440 transmitter.
Sequence generator 410 generates a sequence for obtaining time and frequency synchronization, a cell identification sequence, a plurality of short sequences and an adjacent cell interference reduction scrambling sequence, and transmits them to the synchronization signal 420.
The sync signal generator 420 generates a primary sync signal, a secondary sync signal and a pilot model using the sequences transmitted by the sequence generator 410.
The sync signal generator 420 generates a primary sync signal using a time and frequency sync sequence and a cell identification sequence. The sync signal generator 420 generates a secondary sync signal using a plurality of short streams and an adjacent cell interference reduction scrambling sequence.
The synchronization signal generator 420 generates a pilot model of a downlink signal by allocating an appropriate scrambling sequence that is allocated for each cell to the pilot channel, in order to encode a common pilot symbol and a data symbol of the
11/23 cellular system.
The frequency mapper 430 maps the primary sync signal, the secondary sync signal and the pilot model generated by the sync signal generator 420, and frame control information and broadcast traffic data provided from outside the domains. time and frequency to generate a downlink frame.
The OFDM 440 transmitter receives the downlink frame from the frequency mapper 430 and transmits it through a transmitting antenna.
A method for generating a downlink frame, according to an exemplary embodiment of the present invention, will now be described with reference to Figures 5 and 7. Figure 5 presents a flowchart of a method for generating a downlink frame, according to a exemplary embodiment of the present invention.
As shown in Figure 5, sequence generator 410 generates a plurality of short sequences and a plurality of adjacent cell interference reduction scrambling sequences and transmits them to the sync signal generator 420 (S510).
The sync signal generator 420 generates a secondary sync signal using the short sequences and the adjacent cell interference reduction scrambling sequences transmitted by the sequence generator 410 (S520). The exemplary embodiment of the present invention will exemplify the framework that includes two secondary synchronization channels, but is not limited to it.
Two secondary methods for generating the synchronization signal, according to an exemplary embodiment of the present invention, will now be described with reference to Figure 6 and Figure 7. Figure 6 shows a first method for generating a synchronization signal.
12/23 secondary synchronization, according to an exemplary embodiment of the present invention, and Figure 7 shows a second method for generating a secondary synchronization signal according to an exemplary embodiment of the present invention.
A short string (wn) is a binary string (binary code) that indicates the cell group information. That is, the short sequence (wn) is a binary sequence allocated to the cell group number and to the frame synchronization and its length is half the number of subcarriers allocated to the secondary synchronization channel. The exemplary embodiment of the present invention describes the case where the number of subcarriers allocated for the secondary synchronization channel symbol is 62, but is not limited to it. Thus, the length of the short sequence according to the exemplary embodiment of the present invention is 31.
The first short sequence (wO) is a sequence allocated to the even subcarrier of the first (slot 0) secondary synchronization channel and is expressed in Equation 1.
Equation 1 w0 = [w0 (0), w0 (l), ···, w0 (k), ··, w0 (30)]
Here, k represents an index of the even subcarrier used for the synchronization channel.
The second short sequence (wl) is a sequence allocated to the odd subcarrier of the first (slot 0) secondary synchronization channel and is expressed in Equation 2.
Equation 2 wl = [wl (0), wl (l), ···, wl (m), · wl (30)]
Here, m represents an index of the odd subcarrier used for the synchronization channel.
The third short sequence (w2) is a sequence allocated to the even subcarrier of the second (slot 10) secondary synchronization channel and is expressed in Equation 3.
Equation 3 w2 = [w2 (0), w2 (l), ·, w2 (k), -, w2 (30)]
The fourth short sequence (w3) is a sequence allocated to the odd subcarrier of the second (slot 10) secondary synchronization channel and is expressed in Equation 4.
Equation 4 w3 = [w3 (0), w3 (l),, w3 (m), - w3 (30)] wO, wl, w2 and w3 can be different sequences from each other and it may be that wO = w3 and wl = w2, or it could be that wO = w2 and wl = w3. When given that wO = w3 and wl = w2, the short sequences of the second secondary synchronization channel can be allocated using the short sequences allocated to the first synchronization channel and a terminal only needs to memorize the 170 short sequences allocated to the first secondary sync channel and therefore reduces complexity.
The first method for generating the secondary sync signal is to allocate the first short sequence for each even subcarrier of the first secondary synchronization channel and the second short sequence for each odd subcarrier of the first secondary synchronization channel, as shown in Figure 6. The first method is then to allocate the third short sequence for each even subcarrier of the second secondary synchronization channel and the fourth short sequence for each odd subcarrier of the second secondary synchronization channel.
14/23
According to the first method for generating the secondary sync signal, since the secondary sync signal is generated by combining two short strings with length 31, the number of secondary sync signals becomes 961, which is sufficiently larger than the required number of 170 or 340.
The second method for generating the secondary synchronization signal is to allocate the first sequence determined by Equation 5 for each even subcarrier of the first (slot 0) secondary synchronization channel and the second sequence determined by Equation 6 for each odd subcarrier of the first (slot 0 ) secondary synchronization channel, as shown in Figure 7. The second method also includes the allocation of the third sequence determined by Equation 7 for each even subcarrier of the second (slot 10) secondary synchronization channel and the fourth sequence determined by Equation 8 for each odd subcarrier of the second (slot 10) secondary synchronization channel .
A scrambling sequence Pj, i to scramble the first short sequence wO is given as Pj, i = [Pj, i (O), Pj, i (l), -Pj, i (k) ··· Pj, i (30)], ej (j = O, 1, 2) is a number of a cell identification sequence allocated to the primary synchronization channel. Therefore, Pj, i is determined by the primary synchronization signal. Pj, i is a known value when the mobile station unmap the sequence in order to know the cell ID group and the frame limit.
As expressed in Equation 5, the respective elements of the first sequence co, according to the second method for generating the secondary synchronization signal, are products of the respective elements of the first short sequence wO and the corresponding elements of Pj, i.
Equation 5
15/23 c<sub>The</sub>= [wO (O) Pj, i (O), wO (l) Pj, i (l), -, wO (k) Pj, i (k),, wO (3O) Pj, i (3O)]
Here, k is an index of the even subcarrier used for the synchronization channel.
A Swo scrambling sequence to scramble 5 of the second short sequence wl is given as Swo = [Swo (O), Swo (l), ···, Swo (m), ···, Swo (30)], and Swo is determined by the first short sequence (wO).
In this case, it is possible to determine Swo according to the short sequence group to which the first short sequence belongs, by combining the short sequences in a group.
For example, since the length of the short sequence is 31 in the exemplary embodiment of the present invention, there are 31 short sequences. Therefore, short strings 0 to 7 are defined to belong to group 0, short strings 8 to 15 are defined to belong to group 1, short sequences 16 to 23 are defined to belong to group 2 and sequences shorts 24 to 30 are defined to belong to group 3, a scrambling code is mapped in each group and the scrambling code mapped in the group to which the first short sequence belongs is determined to be Swo.
It is possible to divide the short sequence number by 8, combine the short sequences that have the same residuals and, thus, classify the 31 short sequences into 8 groups. That is, the short sequence number is divided by 8, the short sequence that has residual 0 is defined to belong to group 0, the short sequence that has residual 1 is defined to belong to group 1, the short sequence that has residual 2 is defined to belong to group 2, the short sequence that has residual 3 is defined to belong to group 3, the short sequence that has residual 4 is defined to belong to group 4, a
16/23 short sequence that has residual 5 is defined to belong to group 5, the short sequence that has residual 6 is defined to belong to group 6, the short sequence that has residual 7 is defined to belong to group 7, a scrambling code is mapped in each group and the scrambling code mapped in the group to which the first short sequence belongs is determined to be Swo.
As expressed in Equation 6, the respective elements of the second sequence ci, according to the second method for generating the secondary synchronization signal, are products of the respective elements of the second short sequence wl and the corresponding corresponding elements of Swo.
Equation 6 ci = [wl (O) Swo, wl (l) Swo (l), ···, wl (m) Swo (m), -, wl (3O) Swo (3O)]
Here, m is an index of the odd subcarrier used for the synchronization channel.
The scrambling sequence Pj, 2 to scramble the third short sequence w2 is given as Pj, 2 = [Pj, 2 (0), Pj, 2 (l), Pj, 2 (k) ··· Pj, 2 (30)], ej (j = O, 1, 2) is a number from a cell identification sequence allocated to the primary synchronization channel. Therefore, Pj, 2 is determined by the primary synchronization signal. Pj, 2 is a known value when the terminal unmap the code in order to know the cell ID group and the frame limit.
As expressed in Equation 7, the respective elements of the third sequence C2, according to the second method for generating the secondary synchronization signal, are products of the respective elements of the third short sequence w2 and the corresponding corresponding elements of Pj, 2.
Equation 7
17/23 c2 = [w2 (0) P<sub>jl2</sub>(0), w2 (l) Pj<sub>(2</sub>(l), ···, w2 (k) P<sub>j> 2</sub>(k), -, w2 (30) P<sub>jl2</sub>(30)]
Here, k is an index of the even subcarrier used for the synchronization channel.
The scrambling sequence Sw2 to scramble the fourth short sequence is given as Sw2 = [Sw2 (0), Sw ^ l), Sw2 (m), Sw2 (30)], and Sw2 is determined by the third short sequence w2.
In this case, it is possible to combine the short strings into a group and determine Sw2 according to the short sequence group to which the third short sequence belongs.
For example, since the length of the short sequence, according to the exemplary embodiment of the present invention, is 31, there are 31 short sequences. Therefore, short strings from 0 to 7 are defined to belong to group 0, short strings 8 to 15 are defined to belong to group 1, short sequences 16 to 23 are defined to belong to group 2 , the short strings 24 to 30 are defined to belong to group 3, a scrambling code is mapped in each group and the scrambling code mapped in the group to which the third short sequence belongs is determined to be Sw2.
It is also possible to divide the short sequence number by 8, combine the short sequences with the same residuals and classify the 31 short sequences into 8 groups. That is, the short sequence number is divided by 8, the short sequence with residual 0 is defined to belong to group 0, the short sequence with residual 1 is defined to belong to group 1, the short sequence with residual 2 is defined to belong to group 2, the short sequence with residual 3 is defined to belong to group 3, the short sequence with residual 4 is defined to belong to group 4, the short sequence with residual 5 is defined to belong to group group 5, the short sequence with the
18/23 residual 6 is defined to belong to group 6, the short sequence with residual 7 is defined to belong to group 7, a scrambling code is mapped in each group and the scrambling code mapped in the group to which the third sequence short belongs to is determined to be Sw2.
As expressed in Equation 8, the respective elements of the fourth C3 sequence, according to the second method for generating the secondary synchronization signal, are the products of the respective elements of the fourth short sequence and the corresponding elements of Sw2.
Equation 8
C3 = [w3 (0) Sw2 (0), w3 (1) Sw2 (1), ···, w3 (m) Sw2 (m), -w3 (30) Sw2 (30)]
Here, m is an index of the odd subcarrier used for the synchronization channel.
Here, is it given that Pj, i = Pj, 2 and w0?<sup>í</sup>wl / w2 ^ w3 or w0 = w3, wl = w2. In this case, the cell group and frame identification information are mapped in the combination of the first to the fourth short strings and the number of terminal descrambling chances for the secondary synchronization channel scrambling defined by the cell identification sequence number. the primary synchronization channel is reduced.
It is defined that Pj, i # Pj, 2 and w0 = w2, wl = w3. In this case, the cell group information is mapped in the combination of the first short sequence and the second short sequence and the frame synchronization information is mapped in the scrambling sequences Pj, ie Pj, 2 of the secondary synchronization channel defined by the number of cell identification string of the primary sync channel. The number of terminal descrambling chances for secondary synchronization channel scrambling defined by the cell number of the primary synchronization channel cell identification sequence is increased, but the complexity is reduced since the combination of identification sequences cell group is halved.
The frequency mapper 430 maps the secondary sync signal and transmission traffic data generated by the sync signal generator 420 in the time and frequency domains to generate a frame of the downlink signal (S530).
The OFDM 440 transmitter receives the frame from the downlink signal and transmits it through the transmitting antenna (S540).
A method for a terminal to search the cell using a downlink signal according to an exemplary embodiment of the present invention will now be described with reference to Figures 8 to 10.
Figure 8 shows a block diagram of a cell search device 15 according to an exemplary embodiment of the present invention, Figure 9 shows a flowchart of a method for cell search according to a first exemplary embodiment of the present invention and Figure 10 shows a flow chart of a cell search method according to a second exemplary embodiment of the present invention.
As shown in Figure 8, the cell finder includes a receiver 810, a symbol offset and frequency offset estimator 820, a Fourier transformer 830, and a cell ID estimator 840.
A method of searching for a cell according to a first exemplary embodiment of the present invention will now be described with reference to Figure 9.
As shown in Figure 9, receiver 810 receives the base station square / 23 and the symbol offset estimate and frequency offset compensator 820 filters the received signal by the bandwidth allocated to the synchronization channel, correlates the filtered received signal and a plurality of predetermined primary synchronization signals to obtain symbol synchronization and estimates frequency synchronization to compensate for a frequency offset (S910). The symbol synchronization estimate and frequency offset compensator 820 correlates the filtered received signal and a plurality of predetermined primary synchronization signals, estimates the time that has the highest correlation value to be symbol synchronization and transmits the signal number primary synchronization value that has the highest correlation value for the cell ID estimator 840. In this case, the frequency offset is compensated in the frequency domain after the Fourier transformation.
The Fourier transformer 830 performs a Fourier transformation process on the received signal with reference to the symbol synchronization estimated by the symbol synchronization estimate compensator and frequency offset 820 (S920).
The cell ID estimator 840 correlates the received signal transformed by Fourier and a plurality of predetermined secondary sync signals to estimate a cell ID group and frame sync (S930). The cell ID estimator 840 correlates the received signal transformed by Fourier and a plurality of secondary sync signals that are generated by the application of Pj, ie Pj, 2 which are determined by the primary sync signal corresponding to the number of the primary sync signal transmitted by the symbol synchronization estimate offset and frequency offset 820 for Equations 5 to 8, and estimates the frame synchronization and the cell ID group using the secondary synchronization signal that has the highest correlation value. In this case, when the sync channel symbol in a frame is
21/23 provided within a slot or an OFDM symbol, there is no need to additionally obtain frame synchronization, since symbol synchronization becomes frame synchronization.
The cell ID estimator 840 estimates the cell ID using the number of the primary sync signal transmitted by the symbol sync estimation and frequency offset compensator 820 and the estimated cell ID group (S940). In this case, the cell ID estimator 840 estimates the cell ID by referring to the mapping ratio of the predetermined primary sync signal number, to the cell ID group and to the cell ID.
The estimated cell ID information can be verified using the scrambling sequence information included in the pilot symbol range.
A method of searching for a cell according to a second exemplary embodiment of the present invention will now be described with reference to Figure 10.
Receiver 810 receives the frame from the base station and the symbol synchronization estimate offset and frequency offset 820 filters the received signal by the bandwidth allocated to the synchronization channel, correlates the filtered received signal and a plurality of signal signals. predetermined primary synchronization to obtain symbol synchronization and estimates frequency synchronization to compensate for frequency offset (S710). The symbol sync estimate and frequency offset compensator 820 correlates the filtered received signal and a plurality of predetermined primary sync signals to estimate the time that has the highest correlation value to be symbol sync and transmits a plurality of correlation values that are generated by correlating the primary sync signals and the filtered received signal to the cell ID estimator 840. In this case, the
22/23 frequency can be compensated in the frequency domain after the Fourier transformation.
The Fourier transformer 830 performs a Fourier transformation process on the received signal with reference to the symbol synchronization estimated by the symbol synchronization estimate compensator and frequency offset 820 (S720).
The cell ID estimator 840 estimates the cell ID using a plurality of correlation values transmitted by the symbol synchronization and frequency offset estimation compensator 820, the received signal transformed by Fourier and the correlation values of a plurality of predetermined secondary sync signals (S730). The cell ID estimator 840 correlates the received signal transformed by Fourier and a plurality of secondary synchronization signals that are generated by the application of Pj, ie Pj, 2 which are determined according to the primary synchronization signals corresponding to Equations 5 to 8 and finds the secondary sync signal that has the highest correlation value, with respect to a plurality of respective primary sync signals.
The cell ID estimator 840 combines the correlation value of the corresponding primary sync signal transmitted by the symbol sync estimation and frequency offset compensator 820 and the correlation value of the secondary sync signal, which has the highest value of correlation with the received signal transformed by Fourier, among a plurality of secondary synchronization signals, which are generated by the application of Pj, ie Pj, 2, which are determined by the primary synchronization signal corresponding to Equations 5 to 8, with respect to a plurality of respective primary synchronization signals.
The cell ID estimator 840 estimates the synchronization of
23/23 frame and the cell ID group using the secondary sync signal that has the highest value generated by combining the correlation value of the primary sync signal and the correlation value of the secondary sync signal. The cell ID estimator 840 estimates the cell ID using the estimated cell ID group and the primary sync signal that has the highest value generated by combining the correlation value of the primary sync signal and the correlation value of the signal secondary synchronization. In this case, the cell ID estimator 840 estimates the cell ID by referring to the mapping ratio of the predetermined primary sync signal number, to the cell ID group and to the cell ID.
The modalities described above can be performed using a program to perform the functions corresponding to the configuration of the modalities or a recording medium for recording the program in addition to the device and / or method described above, which is easily performed by a person skilled in the art.
Although this invention has been described in relation to what are currently considered to be practical exemplary modalities, it should be understood that the invention is not limited to the revealed modalities, but, on the contrary, it is intended to cover various equivalent modifications and arrangements included in the spirit and the scope of the attached Claims.
1/6 “Downlink Frame Generation Device and Method,
Recording Media and Cell Identification Method in Communication System Terminal ”
8 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8
70 members in 10 offices
Priority claims24
| Document | Office | Kind | Date |
|---|---|---|---|
| 1020070070086 | Republic of Korea | – | |
| 20070070086 | Republic of Korea | A | |
| 20070070086 | Republic of Korea | A | |
| 1020070082678 | Republic of Korea | – | |
| 20070082678 | Republic of Korea | A | |
| 20070082678 | Republic of Korea | A | |
| 1020070083916 | Republic of Korea | – | |
| 20070083916 | Republic of Korea | A | |
| 20070083916 | Republic of Korea | A | |
| 1020080061429 | Republic of Korea | – | |
| 20080061429 | Republic of Korea | A | |
| 20080061429 | Republic of Korea | A | |
| 2008004093 | Republic of Korea | W | |
| 2008004093 | Republic of Korea | W | |
| 200770086 | – | – | – |
| 200782678 | – | – | – |
| 200783916 | – | – | – |
| 2008004093 | – | – | – |
| 200861429 | – | – | – |
| KR20070070086 | – | – | – |
| KR20070082678 | – | – | – |
| KR20070083916 | – | – | – |
| KR20080061429 | – | – | – |
| WO2008KR04093 | – | – | – |
Members70
| Document | Office | Kind | |
|---|---|---|---|
| AU2008273132A1 | Australia | A1 | |
| AU2008273133A1 | Australia | A1 | |
| AU2008273134A1 | Australia | A1 | |
| KR20090006734A | Republic of Korea | A | |
| KR20090006746A | Republic of Korea | A | |
| KR20090006763A | Republic of Korea | A | |
| WO2009008678A2 | World Intellectual Property Organization (WIPO) | A2 | |
| WO2009008679A2 | World Intellectual Property Organization (WIPO) | A2 | |
| WO2009008680A2 | World Intellectual Property Organization (WIPO) | A2 | |
| WO2009008678A3 | World Intellectual Property Organization (WIPO) | A3 | |
| WO2009008679A3 | World Intellectual Property Organization (WIPO) | A3 | |
| WO2009008680A3 | World Intellectual Property Organization (WIPO) | A3 | |
| US2009252332A1 | United States of America | A1 | |
| US2009252333A1 | United States of America | A1 | |
| KR100921769B1 | Republic of Korea | B1 | |
| KR100921777B1 | Republic of Korea | B1 | |
| KR100921778B1 | Republic of Korea | B1 | |
| US2009257409A1 | United States of America | A1 | |
| CN101578785A | China | A | |
| CN101578786A | China | A | |
| CN101578787A | China | A | |
| EP2122864A2 | European Patent Office (EPO) | A2 | |
| EP2127155A2 | European Patent Office (EPO) | A2 | |
| EP2127156A2 | European Patent Office (EPO) | A2 | |
| EP2122864A4 | European Patent Office (EPO) | A4 | |
| EP2127156A4 | European Patent Office (EPO) | A4 | |
| JP2010533411A | Japan | A | |
| JP2010533412A | Japan | A | |
| JP2010533413A | Japan | A | |
| EP2127155A4 | European Patent Office (EPO) | A4 | |
| AU2008273132B2 | Australia | B2 | |
| AU2008273133B2 | Australia | B2 | |
| AU2008273134B2 | Australia | B2 | |
| EP2122864B1 | European Patent Office (EPO) | B1 | |
| EP2127156B1 | European Patent Office (EPO) | B1 | |
| ATE524887T1 | Austria | T1 | |
| ATE524888T1 | Austria | T1 | |
| EP2127155B1 | European Patent Office (EPO) | B1 | |
| EP2375587A1 | European Patent Office (EPO) | A1 | |
| EP2375588A1 | European Patent Office (EPO) | A1 | |
| EP2375589A1 | European Patent Office (EPO) | A1 | |
| ATE528867T1 | Austria | T1 | |
| ES2373002T3 | Spain | T3 | |
| US8325705B2 | United States of America | B2 | |
| US8331406B2 | United States of America | B2 | |
| US8331569B2 | United States of America | B2 | |
| EP2375588B1 | European Patent Office (EPO) | B1 | |
| US2013064231A1 | United States of America | A1 | |
| JP5171950B2 | Japan | B2 | |
| JP5171951B2 | Japan | B2 | |
| EP2375587B1 | European Patent Office (EPO) | B1 | |
| EP2579478A1 | European Patent Office (EPO) | A1 | |
| ES2402572T3 | Spain | T3 | |
| CN101578786B | China | B | |
| CN101578787B | China | B | |
| CN101578785B | China | B | |
| EP2375589B1 | European Patent Office (EPO) | B1 | |
| ES2417882T3 | Spain | T3 | |
| JP5319671B2 | Japan | B2 | |
| ES2428348T3 | Spain | T3 | |
| EP2579478B1 | European Patent Office (EPO) | B1 | |
| CN103442423A | China | A | |
| BRPI0807393A2 | Brazil | A2 | |
| BRPI0807394A2 | Brazil | A2 | |
| BRPI0807745A2This record | Brazil | A2 | |
| US8982911B2 | United States of America | B2 | |
| CN103442423B | China | B | |
| BRPI0807745B1 | Brazil | B1 | |
| USRE47910E | United States of America | E | |
| USRE49665E | United States of America | E |
5 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]GrantedPRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 03/03/2020, OBSERVADAS AS CONDICOES LEGAIS.B16A | B16A | |
| Decision: intention to grant [chapter 9.1 patent gazette]B09A | B09A | |
| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]B06U | B06U | |
| Others concerning applications: alteration of classificationA CLASSIFICACAO ANTERIOR ERA: H04B 7/26B15K | B15K | |
| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]B06F | B06F |
Numbers
- Publication
- PI0807745
- Publication, DOCDB
- PI0807745
- Publication, EPODOC
- BRPI0807745
- Application
- 7745
- Application, DOCDB
- PI0807745
- Application, EPODOC
- BR2008PI07745
Titles2
- Portuguese
- DISPOSITIVO E MÉTODO DE GERAÇÃO DE QUADRO DE DOWNLINK, MÍDIA DE GRAVAÇÃO E MÉTODO DE IDENTIFICAÇÃO DE CÉLULA EM TERMINAL DE SISTEMA DE COMUNICAÇÃO
- English
- DOWNLINK TABLE GENERATION DEVICE AND METHOD, RECORDING MEDIA AND CELL IDENTIFICATION METHOD IN COMMUNICATION SYSTEM TERMINAL
Classification
- CPC, 11
- H04W56/00
- H04J11/0069
- H04L27/2613
- H04L27/26134
- H04J11/0076
- H04L25/03866
- H04L27/2655
- H04L27/2656
- H04L27/2657
- H04L27/2662
- H04W48/16
- IPC, 1
- H04B7 26
