IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0356177
(2006-02-17)
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등록번호 |
US-7751445
(2010-07-26)
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우선권정보 |
JP-9-345820(1997-12-01) |
발명자
/ 주소 |
- Hayashi, Masaki
- Miya, Kazuyuki
- Kato, Osamu
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출원인 / 주소 |
|
대리인 / 주소 |
Greenblum & Bernstein, P.L.C.
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인용정보 |
피인용 횟수 :
0 인용 특허 :
15 |
초록
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A base station apparatus in a CDMA/TDD mobile communication system is provided. A signal is formed employing a frame configuration with a plurality of time slots and spreading processing utilizes a long spreading code for identifying a cell and a short spreading code for acquiring frame synchronizat
A base station apparatus in a CDMA/TDD mobile communication system is provided. A signal is formed employing a frame configuration with a plurality of time slots and spreading processing utilizes a long spreading code for identifying a cell and a short spreading code for acquiring frame synchronization. The base station apparatus includes a first control channel former that forms a first control channel including a symbol that is spread by a first short spreading code. A second control channel former forms a second control channel including a symbol spread by a second short spreading code and positioned at a same timing as the symbol spread by the first short spreading code.
대표청구항
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What is claimed: 1. A base station apparatus in a CDMA/TDD mobile communication system in which a signal is formed employing a frame configuration with a plurality of time slots, the base station apparatus comprising: a first control channel former that forms a first control channel including a fir
What is claimed: 1. A base station apparatus in a CDMA/TDD mobile communication system in which a signal is formed employing a frame configuration with a plurality of time slots, the base station apparatus comprising: a first control channel former that forms a first control channel including a first symbol that is spread with a first short spreading code used to acquire synchronization at a mobile station; a selector that selects a second short spreading code, out of a plurality of short spreading codes, and a phase difference between the first short spreading code and the second short spreading code, based on a size of an offset and an order of time slots in the plurality of time slots, the size being determined for a cell; a second control channel former that forms a second control channel including a second symbol spread with a second short spreading; a traffic channel former that forms a traffic channel including a symbol spread with a long spreading code used to identify the cell; and a transmitter that transmits the first symbol in the first control channel and the second symbol in the second control channel, at a same timing as the offset after a division of a time slot, the selected phase difference being provided between the first symbol and the second symbol, and transmits the symbol spread with the long spreading code in the traffic channel. 2. The apparatus of claim 1, wherein the short spreading code is selected based on a candidate long spreading code. 3. The apparatus of claim 1, wherein the second short spreading code is selected according to a number that represents one of the plurality of short spreading codes, the number being determined based on the size of the offset and the order of time slots in the plurality of time slots. 4. The apparatus of claim 1, wherein the second short spreading code is selected according to a periodic sequential ordering of codes over the plurality of time slots, the periodic ordering being determined based on the size of the offset and the order of time slots in the plurality of time slots. 5. The apparatus of claim 1, wherein the phase difference is selected according to a periodic sequential ordering of the phase difference between the first short spreading code and the second short spreading code over the plurality of time slots, the periodic ordering being determined based on the size of the offset and the order of time slots in the plurality of time slots. 6. The apparatus of claim 1, wherein the second short spreading code and the phase difference are selected according to a periodic sequential ordering of a combination of a number that represents a short spreading code and a phase difference between the first short spreading code and the second short spreading code over the plurality of time slots, the periodic ordering being determined based on the size of the offset and the order of time slots in the plurality of time slots. 7. A mobile station apparatus in a CDMA/TDD mobile communication system in which a signal is received employing a frame configuration with a plurality of time slots, the mobile station apparatus comprising: a first code generating section operable to generate a first short spreading code; a second code generating section operable to generate a second short spreading code; a dispreading section operable to: (i) despread a received signal with a first short spreading code, obtain a first correlation value and a first correlation phase, and acquire a first periodic timing, and (ii) despread the received signal with a plurality of second short spreading codes at the periodic timing, and obtain a second correlation value and a second correlation phase; and an initial synchronization section operable to detect a size of an offset determined for a cell, the offset covering from a division of a time slot to the first periodic timing, and an order of time slots in a plurality of time slots, based on the second correlation and a phase difference between the first correlation and the second correlation, and acquires a second periodic timing which precedes the first periodic timing by the detected offset, wherein the dispreading section is also operable to despread the received signal with a long spreading code for identifying the cell, based on the second periodic timing and the order of time slots in the plurality of time slots. 8. The apparatus of claim 7, wherein the initial synchronization section is operable to detect a candidate long spreading code based on the second correlation and the phase difference between the first correlation and the second correlation. 9. The apparatus of claim 7, wherein the initial synchronization section is operable to detect the size of the offset based on a number that represents a code detected in the second correlation detector. 10. The apparatus of claim 7, wherein the initial synchronization section detects the size of the offset using a periodic sequential ordering of the second correlation detection value over the plurality of time slots. 11. The apparatus of claim 7, wherein the initial synchronization section detects the size of the offset using a periodic sequential ordering of a phase difference between the first correlation phase and the second correlation phase over the plurality of time slots. 12. The apparatus of claim 7, wherein the initial synchronization section detects the size of the offset using a periodic sequential ordering of a combination of a number that represents a code detected in the second correlation detector and a phase difference between the first correlation phase and the second correlation phase. 13. A transmission method in a CDMA/TDD mobile communication system in which a signal is formed employing a frame configuration with a plurality of time slots, the method comprising: forming, in a first control channel former, a first control channel including a first symbol that is spread with a first short spreading code used to acquire synchronization at a mobile station; selecting, in a selector, a second short spreading code among a plurality of short spreading codes and a phase difference between the first short spreading code and the second short spreading code, based on a size of an offset and an order of time slots in a plurality of time slots, the size being determined for a cell; forming, in a second control channel former, a second control channel including a second symbol spread with the second short spreading code; forming, in a traffic channel former, a traffic channel including a symbol spread with a long spreading code used to identify the cell; and transmitting, in a transmitting section, the first symbol in the first control channel and the second symbol in the second control channel at a same timing as the offset after a division of a time slot, the selected phase difference being provided between the first symbol and the second symbol, and transmitting the symbol spread with the long spreading code in the traffic channel. 14. The method of claim 13, wherein the second short spreading code is selected based on a candidate long spreading code. 15. The method of claim 13, wherein the a second short spreading code is selected according to a periodic sequential ordering of codes over a plurality of time slots, the periodic ordering being determined based on the size of the offset and the order of time slots in the plurality of time slots. 16. The method of claim 13, wherein the phase difference is selected according to a periodic sequential ordering of a phase difference between the first short spreading code and the second short spreading code over a plurality of time slots, the periodic ordering being determined based on the size of the offset and the order of time slots in the plurality of time slots. 17. The method of claim 13, wherein the second short spreading code and the phase difference between the first short spreading code and the second short spreading code are selected according to a periodic sequential ordering of a combination of a number that represents a short spreading code and the phase difference between the first short spreading code and the second short spreading code over the plurality of time slots, the periodic ordering being determined based on the size of the offset and the order of time slots in the plurality of time slots. 18. A receiving method in a CDMA/TDD mobile communication system that receives a signal employing a frame configuration with a plurality of time slots, the received signal being spread by a long spreading code, the method comprising: despreading, in a despreading section, a received signal using a first short spreading code, obtaining a first correlation value and a first correlation phase, and acquiring a first periodic timing; despreading, in the dispreading section, the received signal using a plurality of kinds of second short spreading codes at the first periodic timing, and obtaining a second correlation value and a second correlation phase; obtaining, in an initial synchronization section, a size of an offset determined for a cell, the offset covering from a division of a time slot to the first periodic timing, and an order of time slots in a plurality of time slots, based on the second correlation value and a phase difference between the first correlation phase and the second correlation phase, and acquires a second periodic timing which precedes the first periodic timing by the detected offset; and despreading, in the dispreading section, the received signal using a long spreading code for identifying the cell, based on the second periodic timing and the order of time slots in the plurality of time slots. 19. The method of claim 18, wherein a candidate long spreading code is obtained using the second correlation value and the phase difference between the first correlation phase and the second correlation phase. 20. The method of claim 18, wherein the size of the offset is obtained using a periodic sequential ordering of correlation value over the plurality of time slots. 21. The method of claim 18, wherein the size of the offset is obtained using a periodic sequential ordering of the phase difference between the first correlation phase and the second correlation phase over the plurality of time slots. 22. The method of claim 18, wherein the size of the offset is obtained using periodic sequential ordering of a combination of a number that represents a code of the plurality of kinds of second short spreading codes and the phase difference between the first correlation phase and the second correlation phase.
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