IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
UP-0910854
(2004-08-04)
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등록번호 |
US-7693521
(2010-05-20)
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발명자
/ 주소 |
- Ribas, Hector M.
- Apte, Abhijit V.
- Talley, Ryan S.
- Yew, Meng Y.
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
11 인용 특허 :
40 |
초록
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A mobile station is associated with a first wireless coverage area that has a first pilot signal. A second wireless coverage area that has a second pilot signal is in the mobile station's neighbor list. The mobile station measures E1, the energy per chip of the first pilot signal, and I1, the total
A mobile station is associated with a first wireless coverage area that has a first pilot signal. A second wireless coverage area that has a second pilot signal is in the mobile station's neighbor list. The mobile station measures E1, the energy per chip of the first pilot signal, and I1, the total received power at the first pilot's frequency. The mobile station also measures E2, the energy per chip of the second pilot signal, and I2, the total received power at the second pilot's frequency. If E2 exceeds E1 by at least a first predetermined amount and E2/I2 exceeds E1/I1 by at least a second predetermined amount, then a handoff of the mobile station from the first wireless coverage area to the second wireless coverage area is effected.
대표청구항
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What is claimed is: 1. A method for determining whether to effect a handoff of a mobile station from a first wireless coverage area to a second wireless coverage area, said first wireless coverage area having a first downlink band, said first downlink band including a first pilot channel and a plur
What is claimed is: 1. A method for determining whether to effect a handoff of a mobile station from a first wireless coverage area to a second wireless coverage area, said first wireless coverage area having a first downlink band, said first downlink band including a first pilot channel and a plurality of additional channels, said second wireless coverage area having a second downlink band, said second downlink band including a second pilot channel and a plurality of additional channels, said method comprising: said mobile station measuring energy per chip of said first pilot channel as a first absolute signal level (E1) of said first pilot channel; said mobile station measuring energy per chip of said second pilot channel as a second absolute signal level (E2) of said second pilot channel; determining a first relative signal level (R1) of said first pilot channel; determining a second relative signal level (R2) of said second pilot channel; and if E2 exceeds E1 by at least a first predetermined amount and R2 exceeds R1 by at least a second predetermined amount, effecting said handoff of said mobile station from said first wireless coverage area to said second wireless coverage area. 2. The method of claim 1, wherein said first and second downlink bands are both defined by a frequency, f0, modulated by a pseudonoise (PN) sequence, but with distinct PN offsets. 3. The method of claim 2, further comprising: said mobile station measuring a total received power level (I0) at frequency f0, wherein R1 is equal to E1/I0 and R2 is equal to E2/I0. 4. The method of claim 3, wherein determining a first relative signal level (R1) of said first pilot channel comprises said mobile station calculating R1, based on E1 and I0, and determining a second relative signal level (R2) of said second pilot channel comprises said mobile station calculating R2, based on E2 and I0. 5. The method of claim 4, further comprising: said mobile station comparing E2 to E1 and comparing R2 to R1. 6. The method of claim 4, further comprising: said mobile station reporting E1, E2, R1, and R2 to a handoff controller; and said handoff controller comparing E2 to E1 and comparing R2 to R1. 7. The method of claim 3, further comprising: said mobile station reporting E1, E2, and I0 to a handoff controller. 8. The method of claim 7, wherein determining a first relative signal level (R1) of said first pilot channel comprises said handoff controller calculating R1, based on E1 and I0, and determining a second relative signal level (R2) of said second pilot channel comprises said handoff controller calculating R2, based on E2 and I0. 9. The method of claim 8, further comprising: said handoff controller comparing E2 to E1 and comparing R2 to R1. 10. The method of claim 1, wherein said first downlink band is defined by a first frequency (f1) modulated by a PN code and said second downlink band is defined by a second, different frequency (f2) modulated by said PN code. 11. The method of claim 10, further comprising: said mobile station measuring a first total received power level (I1) at said first frequency (f1) and measuring a second total received power level (I2) at said second frequency (f2), wherein R1 is equal to E1/I1 and R2 is equal to E2/I2. 12. The method of claim 11, wherein determining a first relative signal level (R1) of said first pilot channel comprises said mobile station calculating R1, based on E1 and I1, and determining a second relative signal level (R2) of said second pilot channel comprises said mobile station calculating R2, based on E2 and I2. 13. The method of claim 12, further comprising: said mobile station comparing E2 to E1 and comparing R2 to R1. 14. The method of claim 11, further comprising: said mobile station reporting E1, E2, R1, and R2 to a handoff controller; and said handoff controller comparing E2 to E1 and comparing R2 to R1. 15. The method of claim 11, further comprising: said mobile station reporting E1, E2, I1, and I2 to a handoff controller. 16. The method of claim 15, further comprising: said handoff controller comparing E2 to E1 and comparing R2 to R1. 17. The method of claim 1, wherein said handoff is an idle-state handoff. 18. The method of claim 1, wherein said handoff is an active-state handoff. 19. A method for determining whether to effect an idle-state handoff of a mobile station, said mobile station monitoring an active set that includes a primary pilot channel in a primary downlink band and a neighbor set that includes a plurality of neighbor pilot channels in neighbor downlink bands, said primary downlink band including a plurality of traffic channels in addition to said primary pilot channel, said neighbor downlink bands including a plurality of traffic channels in addition to said neighbor pilot channels, said method comprising: said mobile station measuring energy per chip of said primary pilot channel as an absolute signal level (EP) of said primary pilot channel; said mobile station measuring a relative signal level (RP) of said primary pilot channel; said mobile station measuring energy per chip of said neighbor pilot channels as absolute signal levels of said neighbor pilot channels; said mobile station measuring relative signal levels of said neighbor pilot channels; if at least one of said neighbor pilot channels has an absolute signal level (EC) that exceeds EP by at least a first predetermined amount and a relative signal level (RC) that exceeds RP by at least a second predetermined amount, designating a candidate pilot channel from among said at least one of said neighbor pilot channels; and effecting said idle-state handoff to a wireless coverage area associated with said candidate pilot channel. 20. The method of claim 19, wherein effecting said idle-state handoff comprises said mobile station adding said candidate pilot channel to said active set. 21. The method of claim 19, further comprising: said mobile station measuring a total received power level, I0, wherein RC is equal to EC/I0. 22. A method for determining whether to effect an active-state handoff of a mobile station from a source wireless coverage area to a target wireless coverage area, said source wireless coverage area having a source pilot channel and a plurality of additional channels in a source downlink band, said source downlink band having a source frequency, said target wireless coverage area having a target pilot channel and a plurality of additional channels in a target downlink band, said target downlink band having a target frequency, said method comprising: said mobile station measuring energy per chip of said source pilot channel as an absolute signal level (ES) of said source pilot channel; said mobile station measuring a relative signal level (RS) of said source pilot channel; said mobile station measuring energy per chip of said target pilot channel as an absolute signal level (ET) of said target pilot channel; said mobile station measuring a relative signal level (RT) of said target pilot channel; said mobile station transmitting a measurement message to a handoff controller, said measurement message including ES, RS, ET, and RT; said handoff controller comparing ET to ES and comparing RT to RS; and if ET exceeds ES by at least a first predetermined amount and RT exceeds RS by at least a second predetermined amount, effecting said active-state handoff of said mobile station from said source wireless coverage area to said target wireless coverage area. 23. The method of claim 22, wherein effecting said active-state handoff comprises said handoff controller transmitting a handoff direction message to said mobile station. 24. The method of claim 22, wherein said mobile station measuring a relative signal level (RS) of said source pilot channel comprises: said mobile station measuring a total received power level (IS) at said source frequency; and said mobile station calculating RS as the ratio of ES to IS. 25. The method of claim 22, said mobile station measuring a relative target level (RT) of said target pilot channel comprises: said mobile station measuring a total received power level (IT) at said target frequency; and said mobile station calculating RT as the ratio of ET to IT. 26. The method of claim 22, wherein said source frequency and said target frequency are the same. 27. The method of claim 22, wherein said source frequency and said target frequency are different.
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