Method for generating downlink frame, and method for searching cell
23 claims: 10 independent, 13 dependent
- 11/10 “Métodos e Equipamentos de Geração de Quadro de Downlink e de Busca de Célula Por Meio de Estação Móvel em Sistema de Comunicação Sem Fio e Mídias de Gravação” Re ivindicaçõe s 5 1 - Método de Geração de Quadro de Downlink, que inclui um sinal de sincronização primário e um sinal de sincronização secundário num sistema de comunicação sem fio, caracterizado por que compreende:gerar uma primeira sequência curta e uma segunda sequência curta que indicam as informações de grupo de célula;10 gerar uma primeira sequência de scrambling e uma segunda sequência de scrambling determinada pelo sinal de sincronização primário;gerar uma terceira sequência de scrambling determinada;fazer scrambling da primeira sequência curta com a primei15 ra sequência de scrambling e fazer scrambling da segunda sequência curta com a segunda sequência de scrambling·, e mapear o sinal de sincronização secundário que inclui a primeira sequência curta scrambled e a segunda sequência curta scrambled no domínio da freqüência. 20
- 22 - Método de Geração de Quadro de Downlink, de acordo com a Reivindicação 1, caracterizado por que o mapeamento do sinal de sincronização secundário inclui dispor alternadamente a primeira sequência curta scrambled e a segunda sequência curta scrambled numa pluralidade de subportadoras. 25
- 33 - Método de Geração de Quadro de Downlink, de acordo com a Reivindicação 2, caracterizado por que a primeira sequência de scram2/10 bling e a segunda sequência de scrambling são diferentes uma da outra.
- 44 - Método de Geração de Quadro de Downlintc, que inclui um sinal de sincronização primário e um sinal de sincronização secundário, caracterizado por que compreende:gerar uma primeira sequência curta e uma segunda sequência curta que indicam a informação de grupo de célula;gerar uma primeira sequência de scrambling e uma segunda sequência de scrambling determinadas pelo sinal de sincronização primário;gerar uma terceira sequência de scrambling determinada por um grupo de sequência curta, onde o sistema de comunicação sem fio usa uma pluralidade de sequências curtas e a pluralidade de sequências curtas é agrupada numa pluralidade de grupos de sequência curta aos quais a primeira sequência curta é atribuída e uma quarta sequência de scrambling determinada por um grupo de sequência curta ao qual a segunda sequência curta é atribuída;fazer scrambling da primeira sequência curta com a primeira sequência de scrambling e fazer scrambling da segunda sequência curta com a segunda sequência de scrambling e a terceira sequência de scrambling·, fazer scrambling da segunda sequência curta com a primeira sequência de scrambling e fazer scrambling da primeira sequência curta com a segunda sequência de scrambling e a quarta sequência de scrambling·, e mapear o sinal de sincronização secundário que inclui a primeira sequência curta scrambled com a primeira sequência de scrambling, a segunda sequência curta scrambled com a segunda sequência de scrambling e a terceira sequência de scrambling, a segun3/10 da sequência curta scrambled com a primeira sequência de scrambling e a primeira sequência curta scrambled com a segunda sequência de scrambling e a quarta sequência de scrambling no domínio da freqüência.
- 55 5 - Método de Geração de Quadro de Downlink, de acordo com a Reivindicação 4, caracterizado por que nele o mapeamento do sinal de sincronização secundário inclui:dispor alternadamente a primeira sequência curta scrambled com a primeira sequência de scrambling e a segunda sequência 10 curta scrambled com a segunda sequência de scrambling e a terceira sequência de scrambling numa pluralidade de subportadoras para gerar um sinal de sincronização secundário;e dispor alternadamente a segunda sequência curta scrambled com a primeira sequência de scrambling e a primeira sequência 15 curta scrambled com a segunda sequência de scrambling e a quarta sequência de scrambling numa pluralidade de subportadoras para gerar o outro sinal de sincronização secundário.
- 66 - Equipamento de Geração de Quadro de Downlink, que inclui um sinal de sincronização primário e um sinal de sincronização secundário 20 num sistema de comunicação sem fio, caracterizado por que compreende:uma unidade de geração de sequência que gera uma primeira sequência curta e uma segunda sequência curta que indicam as informações de grupo de célula, sendo a primeira sequência de scram25 bling e a segunda sequência de scrambling determinadas pelo sinal de sincronização primário e uma terceira sequência de scrambling determinada por um grupo de sequência curta, em que o sistema de comunicação sem fio usa uma pluralidade de sequências curtas e a pluralidade de sequências curtas é agrupada numa pluralidade de grupos de 4/10 sequência curta aos quais é atribuída a primeira sequencia curta;e uma unidade de geração de sinal de sincronização que faz scrambling da primeira sequência curta com a primeira sequência de scrambling e faz scrambling da segunda sequência curta com a segunda 5 sequência de scrambling e a terceira sequência de scrambling, e então gera um sinal de sincronização secundário que inclui a primeira sequência curta scrambled e a segunda sequência curta scrambled.
- 77 - Equipamento de Geração de Quadro de Downlink, de acordo com a Reivindicação 6, caracterizado por que compreende, além disso, uma 10 unidade de mapeamento de frequência que dispõe alternadamente a primeira sequência curta scrambled e a segunda sequência curta scrambled numa pluralidade de subportadoras.
- 88 - Equipamento de Geração de Quadro de Downlink, de acordo com a Reivindicação 7, caracterizado por que a primeira sequência de 15 scrambling e a segunda sequência de scrambling são diferentes uma da outra
- 99 - Equipamento de Geração de Quadro de Downlink, de acordo com a Reivindicação 7, caracterizado por que a unidade de geração de sequência gera uma quarta sequência de scrambling determinada por 20 um grupo de sequência curta ao qual é atribuída a segunda sequência curta.
- 1010 - Equipamento de Geração de Quadro de Downlink, de acordo com a Reivindicação 9, caracterizado por que a unidade de geração de sinal de sincronização dispõe alternadamente a segunda sequência 25 curta scrambled com a primeira sequência de scrambling e a primeira sequência curta scrambled com a segunda sequência de scrambling e a quarta sequência de scrambling numa pluralidade de subportadoras para gerar outro sinal de sincronização secundário.
- 1111 - Método de Busca de Célula Por Meio de Estação Móvel em 5/10 Sistema de Comunicação Sem Fio, caracterizado por que compreende:receber um quadro de downlink. incluindo um sinal de sincronização primário e um sinal de sincronização secundário;e 5 estimar as informações de célula usando o sinal de sincronização primário e o sinal de sincronização secundário, onde, no quadro de downlink, uma primeira sequência curta scrambled com uma primeira sequência de scrambling e uma segunda sequência curta scrambled com uma segunda sequência de scrambling 10 e uma terceira sequência de scrambling são alternadamente dispostas numa pluralidade de subportadoras, e a primeira sequência curta e a segunda sequência curta indicam as informações de grupo de célula, a primeira sequência de scrambling e a segunda sequência de scrambling são determinadas pelo 15 sinal de sincronização primário e a terceira sequência de scrambling é determinada por um grupo de sequência curta, onde o sistema de comunicação sem fio usa uma pluralidade de sequências curtas e a pluralidade de sequências curtas é agrupada numa pluralidade de grupos de sequência curta aos quais a primeira sequência curta é 20 atribuída.
- 1212 - Método de Busca de Célula Por Meio de Estação Móvel em Sistema de Comunicação Sem Fio, de acordo com a Reivindicação 11, caracterizado por que a primeira sequência de scrambling e a segunda sequência de scrambling são diferentes uma da outra. 25
- 1313 - Método de Busca de Célula Por Meio de Estação Móvel em Sistema de Comunicação Sem Fio, de acordo com a Reivindicação 11, caracterizado por que o quadro de downlink inclui outro sinal de sincronização secundário em que a segunda sequência curta scrambled com a primeira sequência de scrambling e a primeira sequência curta 5/10 scrambled com a segunda sequência de scrambling e uma quarta sequência de scrambling são alternadamente dispostas numa pluralidade de subportadoras.
- 1414 - Método de Busca de Célula Por Meio de Estação Móvel em 5 Sistema de Comunicação Sem Fio, de acordo com a Reivindicação 13, caracterizado por que a quarta sequência de scrambling é determinada por um grupo de sequência curta ao qual a segunda sequência curta é atribuída.
- 1515 - Equipamento de Busca de Célula Por Meio de Estação Móvel 10 em Sistema de Comunicação Sem Fio, caracterizado por que compreende:uma unidade de recepção que recebe um quadro de downlink incluindo um sinal de sincronização primário e um sinal de sincronização secundário;15 uma unidade de estimativa de grupo de célula que identifica uma célula usando o sinal de sincronização secundário;e uma unidade de estimativa de célula que identifica uma célula no grupo de célula usando o sinal de sincronização primário, onde, no quadro de downlink, uma primeira sequência curta s20 crambled com uma primeira sequência de scrambling e uma segunda sequência curta scrambled com uma segunda sequência de scrambling e uma terceira sequência de scrambling são alternadamente dispostas numa pluralidade de subportadoras, e a primeira sequência curta e a segunda sequência curta in25 dicam as informações de grupo de célula, a primeira sequência de scrambling e a segunda sequência de scrambling são determinadas pelo sinal de sincronização primário e a terceira sequência de scrambling é determinada por um grupo de sequência curta, onde o sistema de 7/10 comunicação sem fio usa uma pluralidade de sequências curtas e a pluralidade de sequências curtas é agrupada numa pluralidade de grupos de sequência curta à qual a primeira sequência curta é atribuída. 5
- 1616 - Equipamento de Busca de Célula Por Meio de Estação Móvel em Sistema de Comunicação Sem Fio, de acordo com a Reivindicação 15, caracterizado por que a primeira sequência de scrambling e a segunda sequência de scrambling são diferentes uma da outra.
- 1717 - Equipamento de Busca de Célula Por Meio de Estação Móvel 10 em Sistema de Comunicação Sem Fio, de acordo com a Reivindicação 15, caracterizado por que o quadro de downlink inclui outro sinal de sincronização secundário em que a segunda sequência curta scrambled com a primeira sequência de scrambling e a primeira sequência curta scrambled com a segunda sequência de scrambling e uma quarta 15 sequência de scrambling são alternadamente dispostas numa pluralidade de subportadoras.
- 1818 - Equipamento de Busca de Célula Por Meio de Estação Móvel em Sistema de Comunicação Sem Fio, de acordo com a Reivindicação 17, caracterizado por que a quarta sequência de scrambling é determi20 nada por um grupo de sequência curta ao qual a segunda sequência curta é atribuída.
- 1919 - Mídia de Gravação, que grava um programa para a realização de um método de geração de um quadro de downlink incluindo um sinal de sincronização primário e um sinal de sincronização secundário, 25 caracterizada por que compreende:gerar uma primeira sequência curta e uma segunda sequência curta que indicam as informações de grupo de célula;gerar uma primeira sequência de scrambling e uma segunda sequência de scrambling determinadas pelo sinal de sincronização 8/10 primário;gerar uma terceira sequência de scrambling determinada por um grupo de sequência curta, onde o sistema de comunicação sem fio usa uma pluralidade de sequências curtas e a pluralidade de se5 quências curtas é agrupada numa pluralidade de grupos de sequência curta aos quais a primeira sequência curta é atribuída;fazer scrambling da primeira sequência curta com a primeira sequência de scrambling e fazer scrambling da segunda sequência curta com a segunda sequência de scrambling e a terceira sequência de 10 scrambling;e , mapear o sinal de sincronização secundário que inclui a primeira sequência curta scrambled e a segunda sequência curta scrambled no domínio da freqüência.
- 2020 - Mídia de Gravação, de acordo com a Reivindicação 19, caracteri15 zada por que o mapeamento do sinal de sincronização secundário inclui dispor alternadamente a primeira sequência curta scrambled e a segunda sequência curta scrambled numa pluralidade de subportadoras.
- 2121 - Mídia de Gravação, de acordo com a Reivindicação 20, caracteri20 zada por que a primeira sequência de scrambling e a segunda sequência de scrambling são diferentes uma da outra.
- 2222 - Mídia de Gravação, que grava um programa para a realização de um método de geração de um quadro de dozunlink. incluindo um sinal de sincronização primário e um sinal de sincronização secundário, 25 caracterizada por que compreende:gerar uma primeira sequência curta e uma segunda sequência curta que indicam as informações de grupo de célula;gerar uma primeira sequência de scrambling e uma segun9/10 da sequência de scrambling determinadas pelo sinal de sincronização primário;gerar uma terceira sequência de scrambling determinada por um grupo de sequência curta, onde o sistema de comunicação sem fio usa uma pluralidade de sequências curtas e a pluralidade de sequências curtas é agrupada numa pluralidade de grupos de sequência curta aos quais a primeira sequência curta é atribuída e uma quarta sequência de scrambling determinada por um grupo de sequência curta ao qual a segunda sequência curta é atribuída;fazer scrambling da primeira sequência curta com a primeira sequência de scrambling e fazer scrambling da segunda sequência curta com a segunda sequência de scrambling e a terceira sequência de scrambling·, fazer scrambling da segunda sequência curta com a primeira sequência de scrambling e fazer scrambling da primeira sequência curta com a segunda sequência de scrambling e a quarta sequência de scrambling·, e mapear o sinal de sincronização secundário que inclui a primeira sequência curta scrambled com a primeira sequência de scrambling, a segunda sequência curta scrambled com a segunda sequência de scrambling e a terceira sequência de scrambling, a segunda sequência curta scrambled com a primeira sequência de scrambling e a primeira sequência curta scrambled com a segunda sequência de scrambling e a quarta sequência de scrambling no domínio da freqüência.
- 2323 - Mídia de Gravação, de acordo com a Reivindicação 22, caracterizada por que o mapeamento do sinal de sincronização secundário inclui:dispor alternadamente a primeira sequência curta scram10/10 bled com a primeira sequência de scrambling e a segunda sequência curta scrambled com a segunda sequência de scrambling e a terceira sequência de scrambling numa pluralidade de subportadoras para gerar um sinal de sincronização secundário;e 5 dispor alternadamente a segunda sequência curta scrambled com a primeira sequência de scrambling e a primeira sequência curta scrambled com a segunda sequência de scrambling e a quarta sequência de scrambling numa pluralidade de subportadoras para gerar o outro sinal de sincronização secundário.
Independent claims23
171 paragraphs, as filed
1/31 “Downlink Board Generation Methods and Equipment. and Cell Search Using a Mobile Station in an Information System
Communication Without Peep and Recording Media ”
Descriptive Report
Technical Field
The present invention relates to a method of generating downlink frames and a method of searching for cells. More particularly, the present invention relates to a method of generating a downlink frame and a method of searching for cells 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), a sequence jump method is applied to a pilot channel in order to obtain cell synchronization and adequate cell identification information. According to the sequence hopping method, a mobile station easily performs a cell search without a separator synchronization channel by introducing sequence hopping technology in the pilot channel. However, in the OFDM system, a number of channels that are capable of being distinguishable by frequency domain over a symbol duration is much greater than that number of channels that are capable of being distinguishable by spreading CDMA over a symbol's duration. time domain. Consequently, when only the time domain is used, resources in terms of capacity can be wasted. For this reason, it is inefficient to directly apply the frequency hopping method to the pilot channel's time domain in the OFDM-based system. So, it is preferable to search for the cell using the received signals efficiently both in the time domain and in the frequency domain.
An example of an existing technology for searching for a cell in the OFDM system includes a method that allocates synchronization information and cell information by dividing a frame into four blocks of time. For the method described above, two framework structures have been proposed. In a first frame structure, synchronization identification information, cell group identification information and unique cell identification information are allocated to four blocks of time, respectively. In a second frame structure, synchronization identification information and unique cell identification information are allocated to a first time block and a third time block and synchronization identification information and cell group identification information are allocated to a second block of time and a fourth block of time.
According to the first frame structure, since symbol synchronization is acquired only in the first block of time, it is impossible for the mobile station to conduct the acquisition of rapid synchronization within the prescribed 5 msec during operation or handover (transfer) between heterogeneous networks. In addition, it is difficult to acquire diversity gain by accumulating synchronization identification information, in order to drive the acquisition of rapid synchronization.
According to the second frame structure, the unique cell identification information or the cell group identification information is correlated along with the synchronization acquisition. Therefore, a cell search process is complex and a quick cell search is difficult.
As an example of another technology for cell search, it was
3/31 proposed a method of acquiring synchronization and searching the cell using a separate preamble. However, this method cannot be applied to a system where the preamble does not exist. In addition, the preamble is placed in front of the board. Consequently, in a case where the mobile station would like to acquire synchronization at a time position that is not the beginning of the frame, there is a problem since one must wait for the next frame. In particular, the mobile station must acquire the initial symbol synchronization within 5 msec during the handover between a GSM mode, a WCDMA mode and a 3GPP LTE mode, but it can acquire the synchronization by a frame unit. For this reason, in some cases, the mobile station cannot acquire the initial symbol synchronization within 5 msec.
As an example of another technology for fetching a cell, there is a method of fetching the cell by allocating two short strings to a secondary sync channel and by mapping the cell ID information to a combination of two short strings. According to this method, since interference occurs between cells when the same short sequence is allocated to sectors adjacent to each other, there is a problem as the performance in searching for cells is reduced.
Detailed Description
Technical problem
The present invention was made in an effort to provide a method of generating a downlink frame that is capable of medium interference between sectors, as well as a method of efficiently searching for cells by receiving the downlink frame.
Technical Solution
An exemplary embodiment of the present invention provides a method of generating a downlink frame including:
Generating a first short sequence and a second short sequence that indicate the cell group information; generate a first scrambling sequence (scrambling) and a second scrambling sequence determined by the primary synchronization signal; generate a third scrambling sequence determined by a short sequence group, where the wireless communication system uses a plurality of short sequences and the plurality of short sequences is grouped into a plurality of short sequence groups to which the first short sequence is assigned ; scrambling the first short sequence with the first scrambling sequence and scrambling the second short sequence with the second scrambling sequence and the third scrambling sequence; and mapping the secondary sync signal that includes the first scrambled short sequence and the second scrambled short sequence in the frequency domain.
Another exemplary embodiment of the present invention provides a method of generating a doivnlink frame, including: generating a first short sequence and a second short sequence that indicate the cell group information; generating a first scrambling sequence and a second scrambling sequence determined by the primary synchronization signal; generate a third scrambling sequence determined by a short sequence group, where the wireless communication system uses a plurality of short sequences and the plurality of short sequences is grouped into a plurality of short sequence groups to which the first short sequence is assigned and a fourth scrambling sequence determined by a short sequence group to which the second short sequence is assigned; scrambling the first short sequence with the first scrambling sequence and scrambling the second short sequence with the second scrambling sequence and the third scrambling sequence; scrambling the second short sequence with the first / 31 r scrambling sequence and scrambling the first short sequence with the second scrambling sequence and the fourth scrambling sequence; and map the secondary sync signal which includes the first short scrambled sequence with the first scrambling sequence, the second short scrambled sequence with the second scrambling sequence and the third scrambling sequence, the second short sequence scrambled with the first scrambling sequence and the first short scrambled sequence with the second scrambling sequence and the fourth scrambling sequence in the frequency domain.
Yet another embodiment of the present invention provides equipment for generating a downlink frame including: a sequence generation unit that generates a first short sequence and a second short sequence that indicate the cell group information, the first scrambling sequence and the second scrambling sequence determined by the primary sync signal and a third determined scrambling sequence by a short sequence group, where the wireless communication system uses a plurality of short strings and the plurality of short strings is grouped into a plurality of short sequence groups to which the first short sequence is assigned; and a sync signal generation unit that scrambles the first short sequence with the first scrambling sequence and scrambles the second short sequence with the second scrambling sequence and the third scrambling sequence and then generates a synchronization signal secondary which includes the first scrambled short sequence and the second scrambled short sequence, respectively.
Yet another embodiment of the present invention provides a method of searching for a cell, including: receiving a downlink frame including a primary sync signal and a secondary sync signal; and estimate the cell information using the
6/31 primary sync signal and secondary sync signal. In this case, in the downlink frame, a first short scrambled sequence with a first scrambling sequence and a second short scrambled sequence with a second scrambling sequence and a third scrambling sequence are alternately arranged in a plurality of subcarriers, and the first short sequence and the second short string indicates the cell group information, the first scrambling sequence and the second scrambling sequence are determined by the primary sync signal and the third scrambling sequence is determined by a short sequence group, where the wireless communication system uses a plurality of short sequences and the plurality of short sequences are grouped into a plurality of short sequence groups to which the first short sequence is assigned.
Yet another embodiment of the present invention provides equipment for searching for a cell, including: a receiving unit that receives a downlink frame including a primary synchronization signal and a secondary synchronization signal; a cell group estimation unit that identifies cell group information using the secondary sync signal; and a cell estimation unit that identifies a cell in the cell group using the primary sync signal. In this case, in the downlink frame, a first short scrambled sequence with a first scrambling sequence and a second short scrambled sequence with a second scrambling sequence and a third scrambling sequence are alternately arranged in a plurality of subcarriers, and the first short sequence and the second short string indicates the cell group information, the first scrambling sequence and the second scrambling sequence are determined by the primary synchronization signal and the third scrambling sequence is determined by a short sequence group, where the
Wireless communication uses a plurality of short strings and the plurality of short strings is grouped into a plurality of short sequence groups to which the first short sequence is assigned.
Yet another embodiment of the present invention provides a recording medium that records a program for carrying out the doivnlink frame generation method. The recording medium that records a program including: generating a first short sequence and a second short sequence that indicate the cell group information; generating a first scrambling sequence and a second scrambling sequence determined by the primary synchronization signal; generate a third scrambling sequence determined by a short sequence group, where the wireless communication system uses a plurality of short sequences and the plurality of short sequences is grouped into a plurality of short sequence groups to which the first short sequence is assigned ; scrambling the first short sequence with the first scrambling sequence and scrambling the second short sequence with the second scrambling sequence and the third scrambling sequence; and mapping the secondary sync signal that includes the first scrambled short sequence and the second scrambled short sequence in the frequency domain.
Yet another embodiment of the present invention provides a recording medium that records a program for carrying out the method of generating a downlink frame. The recording medium that records a program including: generating a first short sequence and a second short sequence that indicate the cell group information; generating a first scrambling sequence and a second scrambling sequence determined by the primary synchronization signal; generate a third scrambling sequence determined by a short sequence group, where the wireless communication system uses a plurality of short sequences and the plurality of short sequences is grouped into a plurality of short sequence groups to which the first sequence short is assigned and a fourth scrambling sequence determined by a short sequence group to which the second short sequence is assigned; scrambling the first short sequence with the first scrambling sequence and scrambling the second short sequence with the second scrambling sequence and the third scrambling sequence; scrambling the second short sequence with the first scrambling sequence and scrambling the first short sequence with the second scrambling sequence and the fourth scrambling sequence; and map the secondary sync signal which includes the first short scrambled sequence with the first scrambling sequence, the second short scrambled sequence with the second scrambling sequence and the third scrambling sequence, the second short sequence scrambled with the first scrambling sequence and the first short scrambled sequence with the second scrambling sequence and the fourth scrambling sequence in the frequency domain.
Advantageous Effects
According to the aforementioned invention, interference between sectors can be reduced by scrambling short sequences due to scrambling sequences, thereby increasing the performance for cell searching.
Brief Description of Drawings
Figure 1 is a diagram illustrating a dotun25 link frame in an OFDM system according to an exemplary embodiment of the present invention.
Figure 2 is a diagram illustrating a configuration of a secondary synchronization channel when two sequences are mapped in the frequency domain in a localizing manner.
9/31
Figure 3 is a diagram illustrating a configuration of a secondary synchronization channel, when two sequences are mapped in the frequency domain in a distributive way.
Figure 4 is a block diagram of an equipment for generating a dotunlink frame according to an exemplary embodiment of the present invention.
Figure 5 is a flow chart illustrating a method of generating a dotunlink frame according to an exemplary embodiment of the present invention.
Figure 6 is a diagram illustrating a first method of generating a secondary synchronization signal according to an exemplary embodiment of the present invention.
Figure 7 is a diagram illustrating a second method of generating a secondary synchronization signal according to an exemplary embodiment of the present invention.
Figure 8 is a diagram illustrating a third method of generating a secondary synchronization signal according to an exemplary embodiment of the present invention.
Figure 9 is a block diagram of a cell search equipment according to an exemplary embodiment of the present invention.
Figure 10 is a flow chart illustrating a cell search method according to a first exemplary embodiment of the present invention.
Figure 11 is a flow chart illustrating a cell search method according to a second exemplary embodiment of the present invention.
10/31
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 addition, parts that are irrelevant to the description are omitted from the drawings to clarify the present invention. Similar reference numerals designate similar elements throughout the specification.
In any Descriptive Report, unless explicitly described to the contrary, the word "understand" and variations such as "understands" or "that understands" will be understood to imply the inclusion of declared elements, but not the exclusion of any15 or other elements. In addition, the term “unit” described in this Descriptive Report means a unit for processing at least one function and operation and can be implemented by hardware components or software components and a combination thereof.
First, referring to Figures 1 to 3, a downlink frame of an OFDM system and a synchronization channel configuration according to an exemplary embodiment of the present invention will be described.
Figure 1 is a diagram illustrating a down25 link frame of an OFDM system according to an exemplary embodiment of the present invention. In Figure 1, the horizontal axis represents the time axis and a vertical axis represents a frequency axis or subcarrier axis.
As shown in Figure 1, a downlink frame
11/31
110, according to an exemplary embodiment of the present invention, has a duration of 10 msec and includes ten subframes (subframes) 120. Each subframe 120 has a duration of 1 msec and includes two slots (slots) 130. Each slot 130 includes six or seven OFDM symbols. The duration of a cyclic prefix in a case where a slot includes six symbols is longer than that of a cyclic prefix in a case where a slot includes seven symbols.
As shown in Figure 1, the doiunlink frame 110, according to an exemplary embodiment of the present invention, includes two synchronization durations 140 in total including synchronization durations 140 in slot No. 0 and slot No. 10, respectively . However, it is not necessarily limited to that. Doiunlink frame 110 can include a sync duration in any slot and can include a sync duration or three or more sync durations. Since the length of the cyclic prefix can be different in each slot, it is preferable that the synchronization duration is located at one end of the slot.
Each slot includes a pilot duration.
The synchronization duration according to the 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 to be adjacent to each other in relation to the time. As shown in Figure 1, the primary sync channel is positioned at the end of the slot and the secondary sync channel is positioned just ahead of the primary sync channel.
The primary synchronization channel includes a primary synchronization signal that has information to identify symbol synchronization and frequency synchronization and some information for cell identification (ID). The secondary sync channel
12/31 includes a secondary sync signal that has information remaining for the cell ID and information to identify frame sync. The mobile station identifies the cell ID by combining cell ID information from the primary sync channel and cell ID information from the secondary sync channel.
For example, assuming the total number of cell IDs is 510, if three identification strings are allocated to the primary sync channel to divide all 510 cell IDs into three groups and if 170 strings are allocated to the sync channel secondary (3x170 = 510), the information of the 510 cell IDs can be represented.
Another method is that the 510 cell IDs are divided into 170 groups by using 170 secondary sync signals that are allocated to the secondary sync channel and the cell ID information in each cell group can be represented by three primary synchronization channels that are allocated to the primary synchronization channel.
Since the secondary synchronization channel includes information to identify frame synchronization, as well as information for the cell ID, two secondary synchronization channels included in a frame are different from each other.
Figure 2 is a diagram illustrating a configuration of a secondary synchronization channel when two short sequences are mapped in a frequency domain in a localizing way and Figure 3 is a diagram illustrating a configuration of a secondary synchronization channel when two sequences short are mapped in a frequency domain in a distributive way.
Referring to Figures 2 and 3, a secondary se13 / 31 synchronization signal, which is inserted in a secondary synchronization channel, according to an exemplary embodiment of the present invention, is formed by the combination of two short sequences. The cell group information and the frame synchronization information are mapped to the two short strings.
As shown in Figure 2, a first sequence can be allocated locally to the subcarriers and then the second short sequence can be allocated locally to the remaining subcarriers. In addition, as shown in Figure 3, the first short sequence can be allocated to each even subcarrier (n = 0, 2, 4, 60) and the second short sequence can be allocated to each odd subcarrier (n = 1, 3, 5, 61).
The length of the short string corresponds to half the number of subcarriers allocated to the secondary synchronization channel. That is, the number of elements in the short sequence that can be generated is up to 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 length of the short sequence corresponds to 31 and the number of elements of the short sequence that can be generated is up to 31.
Since two short streams are allocated to each secondary sync channel, the number of secondary sync streams generated by combining two short streams is 961 (= 31x31) at the most. However, since the information that should be included in the secondary sync channel is cell group information and frame limit information, 170 or 340 (= 170x2) secondary sync sequences are required. Consequently, the number 961 is a sufficiently large value compared to the number 170 or 340.
14/31
Next, an equipment will be described for the generation of a downlink frame according to an exemplary embodiment of the present invention with reference to Figure 4. Figure 4 is a block diagram of the equipment for generating the down5 link frame according to with an exemplary embodiment of the present invention.
As shown in Figure 4, the equipment for generating the downlink frame according to the exemplary embodiment of the present invention includes a sequence generation unit
410, a sync signal generating unit 420, a frequency mapping unit 430, and an OFDM 440 transmitting unit.
Sequence generation unit 410 generates a sequence to obtain time and frequency synchronization, a cell identification sequence, a plurality of short sequences and a scrambling sequence to reduce adjacent cell interference, respectively, and transmitted. them to the sync signal generation unit 420.
The sync signal generation unit 420 generates a primary sync signal, a secondary sync signal and a pilot model using the sequences received from the sequence generation unit 410.
The sync signal generating unit 420 generates the primary sync signal using the sequence to obtain the time and frequency synchronization and the cell identification sequence. In addition, the sync signal generating unit 420 generates the secondary sync signal using the plurality of short streams and scrambling strings to reduce adjacent cell interference.
15/31
The synchronization signal generation unit 420 generates the pilot model of downlink signals by allocating a unique scrambling sequence allocated to each cell to encode a common pilot symbol and data symbol of a cellular system for the pilot channel.
The frequency mapping unit 430 generates the downlink frame by mapping the primary sync signal, the secondary sync signal and the pilot model that are generated from the sync signal generation unit 420 and control information. frame and transmission traffic data that are transmitted from external resources to the time and frequency domains.
The transmitting unit of OFDM 440 receives the downlink frame from the frequency mapping unit 430 and transmits the downlink frame through a given transmitting antenna.
Referring to Figures 5 to 8, a method of generating a downlink frame will be described, according to an exemplary embodiment of the present invention. Figure 5 is a flow chart illustrating the method of generating the downlink frame according to an exemplary embodiment of the present invention.
As shown in Figure 5, the sequence generation unit 410 generates a plurality of short sequences and a plurality of scrambling sequences to reduce interference from a plurality of adjacent cells and transmit them to the synchronization signal generation unit 420 (S510).
The sync signal generating unit 420 generates a secondary sync signal using the short streams and scrambling strings to reduce interference from the plurality of adjacent cells received from the sequence generating unit 410
16/31 (S520). In the exemplary embodiment of the present invention, a table is described that includes two secondary synchronization channels. However, it is not limited to that.
Referring to Figures 6 to 8, three different methods of generating a secondary synchronization signal will be described, according to an exemplary embodiment of the present invention. Figure 6 is a diagram illustrating the first method of generating a secondary synchronization signal according to the exemplary embodiment of the present invention, Figure 7 is a diagram illustrating the second method of generating a secondary synchronization signal according to the exemplary embodiment of the present invention and Figure 8 is a diagram illustrating the third method of generating a secondary synchronization signal according to with the exemplary embodiment of the present invention.
A short string (wn) is a binary string (or binary code) that represents the cell group information. That is, the short sequence (wn) is the binary sequence allocated for a cell group number and for frame synchronization. Furthermore, the length of the short sequence corresponds to half the number of subcarriers allocated to the secondary synchronization channel. In the exemplary embodiment of the present invention, it is described that the number of subcarriers allocated to the secondary synchronization channel is 62. However, it is not limited to this. Thus, the length of the short sequence according to the exemplary embodiment of the present invention is 31.
The first short sequence wO is allocated to the even subcarriers of the first secondary synchronization channel and is defined as given in Equation 1.
Equation 1
17/31 w0 = [w0 (0), wO (l),, w0 (k), ··, w0 (30)]
Here, k represents an index of the even subcarriers used for a secondary synchronization channel.
The second short sequence wl is allocated to the odd subcarriers of the first secondary synchronization channel and is defined as given in Equation 2.
Equation 2 wl = [wl (0), wl (l), ·, wl (m), · wl (30)]
Here, m represents an index of the odd subcarriers used for the secondary synchronization channel.
The third short sequence w2 is allocated to the even subcarriers of the second secondary synchronization channel and is defined as given in Equation 3.
Equation 3 w2 = [w2 (0), w2 (l), ··, w2 (k), ··, w2 (30)]
The fourth short sequence w3 is allocated to the odd subcarriers of the second secondary synchronization channel and is defined as given in Equation 4.
Equation 4 w3 = [w3 (0), w3 (l), ·, w3 (m), w3 (30)]
Here, the short strings wO, wl, w2 and w3 can be different strings. In addition, the relationship between the short strings wO, wl, w2 and w3 can be represented as wO = w3 and wl = w2 (or wO = w2 and wl = w3). Given that wO = w3 and wl = w2, then, the pattern of the short strings allocated to the second secondary sync channel can be determined only by the pattern of the strings
18/31 shorts allocated to the first secondary sync channel. Consequently, by memorizing only the 170 secondary sync sequences generated by a combination of two short sequences allocated to the first secondary sync channel, a mobile station can reduce the complexity required to obtain group cell information and boundary information. of frame.
According to the first method of generating a secondary sync signal as shown in Figure 6, the first short sequence is allocated to each even subcarrier of the first secondary synchronization channel and the second short sequence is allocated to each odd subcarrier of the first channel secondary synchronization. In addition, the third short sequence is allocated to each even subcarrier of the second secondary synchronization channel and the fourth short sequence is allocated to each odd subcarrier of the second secondary synchronization channel.
According to the first method of generating the secondary sync signal, the secondary sync signal is formed by the combination of two short strings that have a length of 31. Consequently, the number of secondary sync signals is 961, which is a value large enough compared to 170 or 340.
According to the second method of generating the secondary synchronization signal shown in Figure 7, a first sequence determined by Equation 5 is allocated to each even subcarrier of the first secondary synchronization channel (slot 0) and the second sequence determined by Equation 6 is allocated to each odd subcarrier of the first secondary synchronization channel (sZoí 0). In addition, a third sequence determined by Equation 7 is allocated to each even subcarrier of the second secon19 / 31 synchronization channel [slot 10) and the fourth sequence determined by Equation 8 is allocated to each odd subcarrier of the second secondary synchronization channel ( only 10).
A scrambling sequence Pj.oi to scramble the first short sequence wO is defined by Pj, o, i = [Pj, o, i (O), Pj, o, i (l), Pj, o, i ( k) Pj, o, i (3O)], where j (j = O, 1, 2) is the number of the cell identification sequence allocated to the primary synchronization channel. Consequently, the scrambling sequence Pj.oi is determined by the primary synchronization signal. The Pj.oi scrambling sequence is a known value when a sequence is de-mapped to find a group of cell ID and frame boundary at the mobile station.
As indicated in Equation 5, each element of the first co. according to the second method of generating the secondary synchronization signal it is a product of each element of the first short sequence wO and each element of the scrambling sequence Pj.oi corresponding thereto.
Equation 5 c<sub>The</sub>= [wO (O) Pj,<sub>The</sub>, i (O), wO (l) Pj,<sub>The</sub>, i (l), -, wO (k) P<sub>jlO</sub>, i (k), •, wO (3O) P<sub>j> 0</sub>, i (3O)]
Here, k represents an index of the even subcarriers used for the secondary synchronization channel.
The Swo scrambling sequence to scramble the second short sequence wl is Pj.0.1 and Swo.
The scrambling sequence Pj, i, i is defined by Pj, i, i = [Pj, i, i (O), Pj, i, i (l), ·· Pj, i, i (m) Pj, m (30)], where j (j = O, 1, 2) is the number of the cell identification sequence allocated to the primary synchronization channel. Consequently, the scrambling sequence Pj, i, i is determined by the primary synchronization signal. In addition, the sequence of
20/31 scrambling Pj, i, i can be the same as the scrambling sequence Pj.oi or it can be different from the scrambling sequence Pj, o, i. When the scrambling sequence Pj, i, i is different from the scrambling sequence Pj, o, i, it may be possible to reduce the interference.
The scrambling sequence Pj, i, i is a previously known value when a sequence is de-mapped to find a cell ID group and a frame boundary at the mobile station.
In addition, the S scrambling sequence<sub>w</sub>o is Swo = [Swo (O), Swo (l),, Swo (m),, Swo (3O)] and the Swo scrambling sequence is determined by the short wO sequence.
At this time, a plurality of short strings is grouped into a plurality of short sequence group and the Swo can be determined by a short sequence group to which the first short sequence is assigned by grouping short sequences.
For example, according to the exemplary embodiment of the present invention, since the length of the first short sequence is 31, there are 31 short sequences. Consequently, assigning the short strings No. 0 to 7 to group 0, the short strands No. 8 to 15 to group 1, the short strands No. 16 to 23 to group 2 and the short strands No. 24 to 30 to group 3. Consequently, Swo is determined by mapping the scrambling code of length 31 to the group to which the first short sequence number is assigned.
In addition, the 31 short strings can be classified into 8 groups by grouping the numbers of the first short strings that have identical residuals when we divide each number of the short strings by 8. That is, assigning the short sequence number that has the residual 0 when dividing the short sequence numbers by 8 to group 0, the short sequence that has the residual
21/31 when the short sequence numbers are divided by 8 to group 1, the short sequence that has the residual 2 when the short sequence numbers are divided by 8 to the group 2, the short sequence that has the residual 3 when the short sequence numbers are divided by 8 to group 3, the short sequence that has the residual 4 when the short sequence numbers are divided by 8 to group 4, the short sequence that has the residual 5 when the short sequence numbers 8 through group 5, the short sequence that has the residual 6 when the short sequence numbers are divided by 8 to group 6 and the short sequence that has the residual 10 to 7 when the short sequence numbers are divided by 8 to group 7. Consequently, S<sub>w</sub>o is determined by mapping a scrambling code of length 31 to the group to which the first sequence number is assigned.
As indicated in Equation 6, each element of a βει 5 second sequence ci, according to the second method of generating the secondary synchronization signal, is a product of each element of the second short sequence wl and each element of the scrambling sequences Pj , i, i and Swo corresponding to them.
Equation 6 ci = [wl (O) Swo (O) Pj, i, i (O), wl (l) S<sub>w0</sub>(l) Pj, i, i (l), wl (m) S<sub>w</sub>o (m) Pj, i, i (m), ·, wl (30) S<sub>w</sub>o (30) Pj, i, i (30)]
Here, m represents the index of the odd subcarriers used for the secondary synchronization channel.
The scrambling sequence Pj, o, 2 to scramble the 25th short sequence w2 is given as Pj, o, 2 = [Pj, o, 2 (O), Pj, o, 2 (l), Pj, o , 2 (k) · Pj, o, 2 (3O)], where j (j = 0, 1, 2) is the number of the cell identification sequence allocated to the primary synchronization channel. Therefore, the scrambling sequence Pj, o, 2 is determined by the primary synchronization signal. In addition, the scrambling sequence Pj, o, 2 is
22/31 a previously known value when the sequence is de-mapped to find the cell ID group and the frame limit at the mobile station.
As indicated in Equation 7, each element of a third sequence C2, according to the second method of generating the secondary synchronization signal, is a product of each element of the third short sequence w2 and each element of the scrambling sequence Pj , o, 2 corresponding to it.
Equation 7 c2 = [w2 (0) Pj, 0,<sub>2</sub>(0), w2 (l) Pj, 0.2 (1), · -, w2 (k) P<sub>j> 0</sub>, 2 (k), w2 (30) Pj, 0.2 (30)]
Here, k represents the index of the even subcarriers used for the secondary synchronization channel.
The scrambling sequences to make the scrambling 15 a fourth short sequence are Pj, i, 2 and Sw2.
The scrambling sequence Pj, i, 2 is Pj, i, 2 = [Pj, i, 2 (0), Pj, 1,2 (1), • Pj, i, 2 (m) Pj, 1,2 ( 30)] ej (j = 0, 1, 2) is the number of the cell identification sequence allocated to the primary synchronization channel. Therefore, the scrambling sequence Pj, i, 2 is determined by the primary synchronization signal. The scrambling sequence Pj, i, 2 is a previously known value when a sequence is de-mapped to find the cell ID group and the frame boundary at the mobile station.
In addition, the scrambling sequence Sw2 is Sw2 = [Sw2 (0), Sw2 {l),, S<sub>W</sub>2 (m),, Sw2 (30)] and the scrambling sequence Sw2 is determined by the third short sequence w2.
At this moment, S<sub>W</sub>two it can be determined by a short sequence group to which the third short sequence is assigned by grouping short sequences.
23/31
For example, according to the exemplary embodiment of the present invention, since the length of the third short sequence is also 31, there are 31 short sequences. Consequently, assigning the short strings No. 0 to 7 to group 0, the short strands No. 8 to 15 to group 1, the short strands No. 16 to 23 to group 2 and the short strands No. 24 to 30 to group 3. Thus, Sw2 is determined by mapping a scrambling code of length 31 to the group to which the third short sequence is assigned.
In addition, the 31 short strings can be classified into 8 groups by grouping the numbers of the third short strings that have the identical residual when we divide each number of short strings by 8. That is, assigning the short sequence number that has the residual 0 when dividing the short sequence numbers by 8 to group 0, the short sequence that has the residual 1 when dividing the short sequence numbers by 8 to group 1, the short sequence that has the residual 2 when dividing the short sequence numbers by 8 to group 2, the short sequence that has the residual 3 when dividing the short sequence numbers by 8 to group 3, the short sequence that has the residual 4 when the short sequence numbers are divided by 8 to group 4, the short sequence that has the residual 5 when the short sequence numbers are divided by 8 to group 5, the short sequence that has the residual 6 when the short sequence numbers are divided by 8 to group 6 and the short sequence that has the residual 7 when the short sequence numbers are divided by 8 to group 7. Consequently, S<sub>W</sub>two is determined by mapping a scrambling code of length 31 to the group to which the third sequence number is assigned.
As indicated in Equation 8, each element of a fourth C3 sequence, according to the second method of generating the secondary synchronization signal, is a product of each element of
24/31 a fourth short sequence w3 and each element of the scrambling sequences Pj, i, 2e S<sub>W</sub>two corresponding to it.
Equation 8
C3 = [w3 (0) S<sub>W</sub>2 (0) Pj, l, 2 (0), w3 (l) Sw2 (l) Pj, 1,2 (1), w3 (m) Sw2 (m) Pj, i, 2 (m),, w3 ( 30) Sw<sub>2</sub>(30) Pj, i,<sub>2</sub>(30)]
Here, m represents the index of the odd subcarriers used for the secondary synchronization channel.
Here, the relationship between the scrambling sequences and the short sequences can be defined as Pj, o, i = Pj, o, 2, Pj, i, i = Pj, i, 2, Pj.oi ^ Pj.ii, Pj , 0.25 ^, 1.2 and w0 # wl # w2?<sup>í</sup>w3 (or w0 = w3 and wl = w2). In this case, the cell group and frame identification information are mapped to the combination of the first to the fourth short strings and the number of chances of descrambling on the mobile station with respect to the scrambling of the secondary synchronization channel determined by the sequence number of Cell ID of the primary sync channel is reduced to 3.
In addition, the relationship between the scrambling sequences and the short sequences can be defined as Pj, o, i ^ Pj, o, 2, Pj, i, i ^ Pj, i, 2, Pj.oi ^ Pj.ii, Pj.o ^^ Pj.i ^ e w0 = w2 and wl = w3. In this case, the cell group information is mapped to the combination of the first short sequence and the second short sequence and the frame synchronization information is mapped to the scrambling sequences (Pj, o, i, Pj, o, 2, Pj, i, i, Pj, i, 2) of the secondary synchronization channel determined by the cell identification sequence number of the primary synchronization channel. Then, the number of chances of descrambling the mobile station with respect to the scrambling of the secondary synchronization channel determined by the cell identification sequence number of the primary synchronization channel is increased to 6. However, the combination of the number of cell group identification strings is reduced by 25/31 by half and the number of chances of descrambling the mobile station with respect to the scrambling determined by the first and third short strings is also reduced by half.
As shown in Figure 8, in the third method of generating a secondary synchronization signal, a first sequence determined by Equation 9 is allocated to each subcarrier pair of a first secondary synchronization channel and a second sequence determined by Equation 10 is allocated to each subcarrier. odd of the first secondary synchronization channel. In addition, a third sequence determined by Equation 11 is allocated to each even subcarrier of a second secondary synchronization channel and a fourth sequence determined by Equation 12 is allocated to each odd subcarrier of the second secondary synchronization channel.
That is, according to the second secondary sync signal generation method, the first short sequence is scrambled with a first scrambling sequence that is 31 in length, which is determined by the cell identification sequence allocated to the channel. primary synchronization and the second short sequence is scrambled with a second scrambling sequence that is 31 in length, which is determined by the cell identification sequence allocated to the primary sync channel. However, according to the third secondary sync signal generation method, the first short sequence and the second short sequence are scrambled with a scrambling sequence that is 62 in length, which is determined by the allocated cell identification sequence. for the primary sync channel.
Pj, i is the scrambling sequence that scrambles the first short sequence and the second short sequence and Pj, 2 is the scrambling sequence that does the scrambling of the third short sequence
26/31 and the fourth short sequence. The scrambling sequences Pj, ie Pj, 2 are represented as Pj, i = [Pj, x (O), Pj, i (l), ·, Pj.i (k), ·, Pj, i (61)] and Pj, 2 = [Pj, 2 (0), Pj, 2 (l), ··, Pj, 2 (k),, Pj, 2 (61)].
Here, j (j = O, 1, 2) is the number of the cell identification sequence 5 allocated to the primary synchronization channel. Consequently, the scrambling sequences Pj, ie Pj, 2 are determined by the number of the cell identification sequence allocated to the primary synchronization channel.
According to the third method of generating the sin10 secondary timing signal, the first sequence co is as indicated in Equation 9, the second sequence ci is as indicated in Equation 10, the third sequence C2 is as indicated in Equation 11 and the fourth sequence C3 is as indicated in Equation 12.
Equation 9
Co = [wO (O) Pj, i (O), wO (l) Pj, i (l), ··, wO (k) Pj, i (k), w0 (30) Pj, i (30)]
IO equation
Ci = [wl (0) S<sub>w0</sub>(0) Pj, i (31), ··, wl (l) Swo (l) Pj, i (32), wl (m) Swo (m) Pj, i (31 + m), ···, wl (30) S<sub>w0</sub>(30) Pj, i (30)]
Equation 11
C2 = [w2 (0) Pj,<sub>2</sub>(0), w2 (l) P<sub>j> 2</sub>(l),, w2 (k) P<sub>j</sub>,<sub>2</sub>(k), w2 (30) Pj, 2 (30) J
Equation 12 c<sub>3</sub>= [w3 (0) Sw2 (0) Pj, 2 (31), w3 (l) Sw2 (l) Pj, 2 (32), w3 (m) Sw2 (m) Pj, 2 (31 + m), · ·, W3 (30) S<sub>W</sub>2 (30) Pj<sub>>2</sub>(61)]
In Equations 9 to 12, k represents the index of the even subcarriers to be used for the secondary synchronization channel and represents the index of the odd subcarriers to be used.
27/31 used for the secondary synchronization channel.
The frequency mapping unit 430 generates the downlink frame. by mapping the secondary sync signal that is generated by the sync signal generating unit 420 and the transmission traffic data for the time and frequency domains S530.
The transmitting unit of OFDM 440 receives the downlink frame from the frequency mapping unit 430 and transmits the downlink frame through the transmitting antenna (S540).
A method of searching for cells by the mobile station using the downlink frame, according to an exemplary embodiment of the present invention will now be described with reference to Figures 9 to 11.
Figure 9 is a block diagram of a cell search equipment according to the exemplary embodiment of the present invention, Figure 10 is a flow chart illustrating a cell search method according to a first exemplary embodiment of the present invention. and Figure 11 is a flow chart illustrating a cell search method according to a second exemplary embodiment of the present invention.
As shown in Figure 9, the cell search equipment, in accordance with the exemplary embodiment of the present invention, includes a 710 receiving unit, a symbol synchronization estimate and frequency offset compensating unit.
720, a Fourier transformer unit 730 and a cell ID estimation unit 740.
A cell search method according to the first exemplary embodiment of the present invention will now be described with reference to Figure 10.
28/31
As shown in Figure 10, the receiving unit 710 receives the transmitted frames from the base station and the symbol offset and frequency offset estimation compensating unit 720 filters the received signal by as much as an allocated bandwidth for the channel. synchronization and obtains symbol synchronization by, respectively, the correlation of the filtered received signal and a plurality of known primary synchronization signals, and compensates for the frequency offset by estimating frequency synchronization (S810). The symbol synchronization estimate and frequency offset compensating unit 720, respectively, correlates the filtered received signal and the plurality of known primary synchronization signals and estimates a time of the highest correlation value as symbol synchronization and transmits a number of a primary sync signal that has the highest belt value for cell ID estimation unit 740. In this case, the frequency offset can be compensated in the frequency domain after carrying out the Fourier transformation process.
The Fourier transforming unit 730 performs the Fourier transformation process of the received signals on the basis of the symbol synchronization estimated by the symbol synchronization estimation compensating unit and frequency offset 720 (S820).
The cell ID estimation unit 740 estimates a group of cell ID and frame synchronization by correlating the received signal transformed by Fourier with a plurality of known secondary synchronization signals S830. The cell ID estimation unit 740 correlates a plurality of secondary sync signals with the received Fourier-transformed signal and estimates the frame sync and the cell ID group using a secondary sync signal that has the highest correlation value. . Here, the plurality of secondary synchronization signals is given by the application of Pj, o, i, Pj.0,2, Pj.1.1 and Pj, i, 2 which are determined
29/31 according to a primary sync signal that corresponds to the number of a primary sync signal transmitted from the symbol sync estimation and frequency offset compensating unit 720 for Equations 5 through 8. At this point, in the case where the synchronization channel symbol exists in a slot or an OFDM symbol with a frame, symbol synchronization becomes frame synchronization.
In addition, cell ID estimation unit 740 estimates cell IDs using the number of a primary sync signal transmitted by the symbol offset and frequency offset estimation unit 720 and the estimated cell ID group S840. At this time, cell ID estimation unit 740 estimates cell ID with reference to the known mapping relationship between the ID, the cell ID group and a primary sync signal number.
The estimated cell ID information can be verified using the scrambling sequence information included in the pilot symbol duration.
A cell search method according to a second exemplary embodiment of the present invention will now be described with reference to Figure 11.
As shown in Figure 11, the receiving unit 710 receives a frame transmitted from the base station and the frequency offset and symbol synchronization estimate compensating unit 720 filters the received signal by as much as an allocated bandwidth for the synchronization channel and obtains the symbol synchronization correlating the filtered received signal and a plurality of known primary sync signals and compensating for the frequency offset by estimating the S910 frequency sync. The symbol synchronization estimation and offset offset compensating unit
30/31 frequency 720, respectively, correlates the filtered received signal and a plurality of known primary sync signals and estimates a time of the highest correlation value as symbol sync and transmits a plurality of known primary sync signal correlation values and the received signal filtered to the cell ID estimation unit 840. At this time, frequency offset compensation can be performed in the frequency domain after the Fourier transformation.
The Fourier transformer unit 730 performs a Fourier transformation process of the received signal with reference to the symbol synchronization which is estimated by the symbol synchronization estimate and frequency offset unit 720 S920.
The cell ID estimation unit 740 estimates cell IDs using the plurality of correlation values transmitted from the symbol offset and frequency offset estimation compensating unit 720 and the correlation values of the received signal transformed by Fourier and a plurality of known secondary sync signals S930. The cell ID estimation unit searches for a secondary sync signal that has the highest correlation value by correlating each of the plurality of known secondary sync signals with the received Fourier-transformed signal for each of the plurality of known primary sync signals. . Here, the plurality of secondary synchronization signals is given by the application of Pj, o, i, Pj, o, 2, Pj.ii and Pj, i, 2 which are determined according to the primary synchronization signal corresponding to the Equations of 5 to 8.
In addition, cell ID estimation unit 740 combines the correlation value of each known primary sync signal transmitted from the estimation compensating unit.
Symbol synchronization and frequency offset 720 and the correlation value of the secondary synchronization signal that has the highest correlation value for each of the plurality of known primary synchronization signals.
The cell ID estimation unit 740 estimates the frame synchronization and a group of cell ID using a secondary synchronization signal that has the highest combined value among all the combined values of the correlation values of a primary synchronization signal and a synchronization signal. a secondary sync signal. In addition, cell ID estimation unit 740 estimates a cell ID using the primary sync signal that has the highest combined value and the estimated cell ID group. At this time, cell ID estimation unit 740 estimates cell ID by referring to a known mapping relationship between the cell ID group, the cell ID and the primary sync signal number.
The exemplary modality of the present invention can not only be implemented by the equipment and / or the method described above, but it can be implemented, for example, by a program that performs the function corresponding to the configuration of the exemplary modality of the present invention and by a media of recording on which the program is recorded. This will be easily implemented from the exemplary embodiment of the present invention by those skilled in the related art.
Although this invention has been described in connection with what is currently considered to be practical exemplary modalities, it should be understood that the invention is not limited to the disclosed modalities, but, on the contrary, it is intended to cover various modifications and equivalent provisions included in the spirit and scope of the appended Claims.
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84 members in 11 offices
Priority claims24
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| KR20070072837 | – | – | – |
| KR20070083915 | – | – | – |
| KR20080044413 | – | – | – |
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| CN101578808A | China | A | |
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| EP2127188A1 | European Patent Office (EPO) | A1 | |
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| EP2137872A1 | European Patent Office (EPO) | A1 | |
| EP2137872A4 | European Patent Office (EPO) | A4 | |
| EP2127188A4 | European Patent Office (EPO) | A4 | |
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| EP2137872B1 | European Patent Office (EPO) | B1 | |
| AT488067T | Austria | T | |
| ATE488067T1 | Austria | T1 | |
| EP2127188B1 | European Patent Office (EPO) | B1 | |
| EP2127189B1 | European Patent Office (EPO) | B1 | |
| EP2207300A3 | European Patent Office (EPO) | A3 | |
| AT490616T | Austria | T | |
| AT490617T | Austria | T | |
| ATE490616T1 | Austria | T1 | |
| ATE490617T1 | Austria | T1 | |
| DE602008003424D1 | Germany | D1 | |
| DE602008003767D1 | Germany | D1 | |
| DE602008003768D1 | Germany | D1 | |
| AU2008279971B2 | Australia | B2 | |
| ES2356030T3 | Spain | T3 | |
| ES2357002T3 | Spain | T3 | |
| ES2357181T3 | Spain | T3 | |
| AU2008279972B2 | Australia | B2 | |
| AU2008279973B2 | Australia | B2 | |
| EP2207300B1 | European Patent Office (EPO) | B1 | |
| AT539513T | Austria | T | |
| ATE539513T1 | Austria | T1 | |
| ES2380065T3 | Spain | T3 | |
| US8320565B2 | United States of America | B2 | |
| US8320571B2 | United States of America | B2 | |
| US8331564B2 | United States of America | B2 | |
| JP5140727B2 | Japan | B2 | |
| JP5140728B2 | Japan | B2 | |
| US2013100902A1 | United States of America | A1 | |
| JP2013102510A | Japan | A | |
| CN101578810B | China | B | |
| CN101578808B | China | B | |
| CN101578809B | China | B | |
| JP5232859B2 | Japan | B2 | |
| BRPI0809496A2This record | Brazil | A2 | |
| BRPI0810397A2 | Brazil | A2 | |
| JP5676660B2 | Japan | B2 | |
| US2015230219A1 | United States of America | A1 | |
| US9144064B2 | United States of America | B2 | |
| BRPI0810700A2 | Brazil | A2 | |
| US9204438B2 | United States of America | B2 | |
| US2016066260A1 | United States of America | A1 | |
| US9888435B2 | United States of America | B2 | |
| US2018160366A1 | United States of America | A1 | |
| US10383041B2 | United States of America | B2 | |
| US2019357127A1 | United States of America | A1 | |
| BRPI0810700B1 | Brazil | B1 | |
| US11425633B2 | United States of America | B2 | |
| US2022407594A1 | United States of America | A1 | |
| US11870546B2 | United States of America | B2 | |
| US2024146409A1 | United States of America | A1 | |
| US12316438B2 | United States of America | B2 | |
| US2025286620A1 | United States of America | A1 |
4 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirementsB11B | B11B | |
| 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: H04L 7/02B15K | B15K | |
| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]B06F | B06F |
Numbers
- Publication
- PI0809496
- Publication, DOCDB
- PI0809496
- Publication, EPODOC
- BRPI0809496
- Application
- 9496
- Application, DOCDB
- PI0809496
- Application, EPODOC
- BR2008PI09496
Titles2
- Portuguese
- MÉTODOS E EQUIPAMENTOS DE GERAÇÃO DE QUADRO DE DOWNLINK E DE BUSCA DE CÉLULA POR MEIO DE ESTAÇÃO MÓVEL EM SISTEMA DE COMUNICAÇÃO SEM FIO E MÍDIAS DE GRAVAÇÃO.
- English
- METHODS AND FRAME GENERATION EQUIPMENT DOWNLINK AND CELL SEARCH FOR MOBILE MEDIA STATION IN NO COMMUNICATION SYSTEM WIRE AND RECORDING MEDIA.
Classification
- CPC, 13
- H04J11/0069
- H04B7/2656
- H04L7/02
- H04L27/2613
- H04L27/2655
- H04W48/16
- H04W72/0446
- H04W72/23
- H04B1/70735
- H04W88/08
- H04W56/00
- H04L27/26
- H04L7/043
- IPC, 4
- H04L7 02
- H04B1 707
- H04J13 00
- H04J13 10
