IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0886640
(2001-06-21)
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발명자
/ 주소 |
- Zaff, David
- Dinc, Abdulkadir
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
19 인용 특허 :
3 |
초록
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A spread spectrum communications system where power control mitigates received signal fluctuations. An implementation is described for forward power control wherein received data is checked for errors. Where an error is detected energy levels of the power control bits and traffic bits are determined
A spread spectrum communications system where power control mitigates received signal fluctuations. An implementation is described for forward power control wherein received data is checked for errors. Where an error is detected energy levels of the power control bits and traffic bits are determined. The energy level of the power control bits is compared against a first predetermined threshold wherein if the energy level of the power control bits is less than the first predetermined threshold an increased in forward power is requested. Otherwise, the energy level of the traffic bits are compared against a second predetermined threshold wherein if the energy level of the traffic bits is less than the second predetermined threshold a decrease in forward power is requested. Otherwise an increase is requested.
대표청구항
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A spread spectrum communications system where power control mitigates received signal fluctuations. An implementation is described for forward power control wherein received data is checked for errors. Where an error is detected energy levels of the power control bits and traffic bits are determined
A spread spectrum communications system where power control mitigates received signal fluctuations. An implementation is described for forward power control wherein received data is checked for errors. Where an error is detected energy levels of the power control bits and traffic bits are determined. The energy level of the power control bits is compared against a first predetermined threshold wherein if the energy level of the power control bits is less than the first predetermined threshold an increased in forward power is requested. Otherwise, the energy level of the traffic bits are compared against a second predetermined threshold wherein if the energy level of the traffic bits is less than the second predetermined threshold a decrease in forward power is requested. Otherwise an increase is requested. determined result in order to carry out said carrying out of said forward transmission; carrying out forward transmission between said mobile station and a particular base station when fading is small; and carrying out forward transmission between said mobile station and at least two base stations including said particular base station when the fading is large. 2. A method as claimed in claim 1, wherein said particular base station has a minimum propagation loss. 3. A method as claimed in claim 1, wherein said method further comprises the step of turning, in other base stations except for said particular base station, the forward transmission off when the fading is small. 4. A method as claimed in claim 1, wherein said method further comprises the step of lowering, in other base stations except for said particular base station, transmission power for the forward transmission when the fading is small. 5. A method as claimed in claim 1, wherein said particular base station has a minimum propagation loss. 6. A method as claimed in claim 1, wherein said method further comprises the step of turning, in other base stations except for said particular base station, the forward transmission off when said particular base station's bit energy-to-interference ratio is the one of said plurality of base stations that has a maximum bit energy-to-interference ratio. 7. A method as claimed in claim 1, wherein said method further comprises the step of lowering, in other base stations except for said particular base station, transmission power for the forward transmission when said particular base station's bit energy-to-interference ratio is the one of said plurality of base stations that has a maximum bit energy-to-interference ratio. 8. A method of controlling communication in a code division multiple access (CDMA) mobile communication system comprising a plurality of base stations and a mobile station for making possible to communicate with said base stations via respective communication channels by a soft handover, said method comprising the steps of: measuring, in said mobile station, propagation losses in said communication channels to determine a particular base station having a minimum propagation loss; measuring, in said mobile station, magnitude of fading in said communication channels to produce a determined result indicative of whether or not the magnitude of the fading has a value which is larger than a predetermined threshold value; transmitting, from said mobile station to said base stations via a reverse link, as a forward transmission power information signal, a combination of a base station information signal indicative of the particular base station, a fading information signal indicative of the determined result, and an error detection information signal for carrying out error detection of the base station information signal and the fading information signal; decoding, in each of said base stations, the forward transmission power information signal to carry out the error detection on the fading information signal and the base station information signal using the error detection information signal; turning, in each of said base stations, a forward transmission off when an error is not detected in the error detection, when the fading information signal indicates that the value of the magnitude of the fading is smaller than the predetermined threshold value, and when its own base station does not correspond to said particular base station indicated by the base station information signal; and otherwise turning, in each of said base stations, the forward transmission on. 9. A method as claimed in claim 8, wherein said step of measuring the propagation losses measures the propagation losses on the basis of differences between transmission power values for perch channels sent from said base stations and actually received power values for the perch channels. 10. A method as claimed in claim 8, wherein said step of mea suring the magnitude of the fading carries out a large or small determination of the fading on the basis of variation in a received level on a transmission power control. 11. A method as claimed in claim 8, wherein said step of measuring the magnitude of the fading carries out a large or small determination of the fading on the basis of a transmission power control error which is an error between a target received power and an actually received power. 12. A method as claimed in claim 8, wherein said step of measuring the magnitude of the fading carries out a large or small determination of the fading on the basis of variation in a fading vector. 13. A method as claimed in claim 8, wherein said turning of the forward transmission on and off is carried out every frame. 14. A method as claimed in claim 8, wherein said turning of the forward transmission on and off is carried out every slot. 15. A method of controlling communication in a code division multiple access (CDMA) mobile communication system comprising a plurality of base stations and a mobile station for making possible to communicate with said base stations via respective communication channels by a soft handover, said method comprising the steps of: measuring, in said mobile station, propagation losses in said communication channels to determine a particular base station having a minimum propagation loss; transmitting, from said mobile station to said base stations via a reverse link, as a forward transmission power information signal, a combination of a base station information signal indicative of the particular base station and an error detection information signal for carrying out error detection of the base station information signal; decoding, in each of said base stations, the forward transmission power information signal to carry out the error detection on the base station information signal using the error detection information signal; determining, in each of said base stations, whether or not magnitude of fading on the reverse link has a value which is larger than a predetermined threshold value; turning, in each of said base stations, a forward transmission off when an error is not detected in the error detection, when the value of the magnitude of the fading is smaller than the predetermined threshold value, and when its own base station does not correspond to said particular base station indicated by the base station information signal; and otherwise turning, in each of said base stations, the forward transmission on. 16. A method as claimed in claim 15, wherein said step of measuring the propagation losses measures the propagation losses on the basis of differences between transmission power values for perch channels sent from said base stations and actually received power values for the perch channels. 17. A method as claimed in claim 15, wherein a large or small determination of the fading is carried out on the basis of variation in a received level on a transmission power control. 18. A method as claimed in claim 15, wherein a large or small determination of the fading is carried out on the basis of a transmission power control error which is an error between a target received power and an actually received power. 19. A method as claimed in claim 15, wherein a large or small determination of the fading is carried out on the basis of variation in a fading vector. 20. A method as claimed in claim 15, wherein said turning of the forward transmission on and off is carried out every frame. 21. A method as claimed in claim 15, wherein said turning of the forward transmission on and off is carried out every slot. 22. A method of controlling communication in a code division multiple access (CDMA) mobile communication system comprising a plurality of base stations, a base station control apparatus connected to said base stations, and a mobile station for making possible to communicate with said base stations via respective communication channels by a
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