US5933782A
Expired / Lapsed
US
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Downlink transmission power control scheme for mobile communication system using site diversity
Assignee: NTT Docomo Inc
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Filing: 1997-07-29
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Granted: 1999-08-03
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Expires: 2017-07-29
Abstract
Abstract A downlink transmission power control scheme for a mobile communication system using the site diversity, which carries out a primary downlink transmission power control using a primary control signal which is transmitted from the mobile station and terminated at each base station, and an additional downlink transmission power control using additional control signals which are transmitted from the base station control station to the base stations. The additional downlink transmission power control may also use a secondary control signal which is transmitted from the mobile station and terminated at the base station control station. The primary downlink transmission power control can be carried out during a non-site diversity period while the additional downlink transmission power control is carried out during the site diversity period, or the primary downlink transmission power control and the additional downlink transmission power control can be both carried out during the site diversity period.
Inventors
- 👤 Etsuhiro Nakano
- 👤 Takehiro Nakamura
- 👤 Koji Ohno
- 👤 Takaaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:09
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/38; H04W52/40; H04W52/30; H04W52/36; H04W52/367
Claims Analysis
Total Claims: 52
Claim 1
Independent Claim
148 words
A method of downlink transmission power control in a mobile communication system formed by a plurality of base stations, a mobile station to be connected with the base stations via radio channels, and a base station control station for controlling the base stations, wherein the mobile communication system uses a site diversity in which the mobile station is simultaneously connected with more than one base stations and a diversity combining among said more than one base stations is carried out, the method comprising the steps of: carrying out a primary downlink transmission power control using a primary control signal which is transmitted from the mobile station and terminated at each base station and not to be combined during a site diversity period; and carrying out an additional downlink transmission power control using additional control signals which are transmitted from the base station control station to the base stations.
Claim 2
Independent Claim
148 words
A method of downlink transmission power control in a mobile communication system formed by a plurality of base stations, a mobile station to be connected with the base stations via radio channels, and a base station control station for controlling the base stations, wherein the mobile communication system uses a site diversity in which the mobile station is simultaneously connected with more than one base stations and a diversity combining among said more than one base stations is carried out, the method comprising the steps of: carrying out a primary downlink transmission power control using a primary control signal which is transmitted from the mobile station and terminated at each base station and not to be combined during a site diversity period; and carrying out an additional downlink transmission power control using additional control signals which are transmitted from the base station control station to the base stations.
Claim 3
Dependent Claim
26 words
The method of claim 1, wherein the primary downlink transmission power control is carried out at shorter time intervals than the additional downlink transmission power control.
Claim 4
Dependent Claim
15 words
The method of claim 1, wherein the primary control signal is a layer-1 control signal.
Claim 5
Dependent Claim
42 words
The method of claim 1, wherein the additional downlink transmission power control also uses a secondary control signal which is transmitted from the mobile station and terminated at the base station control station and to be combined during the site diversity period.
Claim 6
Dependent Claim
15 words
The method of claim 4, wherein the secondary control signal is a layer-3 control signal.
Claim 7
Dependent Claim
35 words
The method of claim 4, wherein the primary downlink transmission power control is carried out during a non-site diversity period, while the additional downlink transmission power control is carried out during the site diversity period.
Claim 8
Dependent Claim
53 words
The method of claim 6, wherein the primary downlink transmission power control is based on a receiving SIR of a communication channel at the mobile station, while the additional downlink transmission power control is based on a bit error rate or a frame error rate of the communication channel at the mobile station.
Claim 9
Dependent Claim
47 words
The method of claim 6, wherein the primary downlink transmission power control is based on a receiving SIR of a communication channel at the mobile station, while the additional downlink transmission power control is based on a receiving SIR of a perch channel at the mobile station.
Claim 10
Dependent Claim
40 words
The method of claim 6, wherein the primary downlink transmission power control and the additional downlink transmission power control are both based on a bit error rate or a frame error rate of a communication channel at the mobile station.
Claim 11
Dependent Claim
26 words
The method of claim 6, wherein the mobile station stops a transmission of a bit corresponding to the primary control signal during the site diversity period.
Claim 12
Dependent Claim
28 words
The method of claim 4, wherein the primary downlink transmission power control and the additional downlink transmission power control are both carried out during the site diversity period.
Claim 13
Dependent Claim
58 words
The method of claim 11, wherein the primary downlink transmission power control controls a transmission power of each base station, while the additional downlink transmission power control sets upper and lower limits for the transmission power of each base station according to a receiving SIR at the mobile station of a perch channel transmitted from each base station.
Claim 14
Dependent Claim
65 words
The method of claim 12, wherein the upper and lower limits for the transmission power of each base station are determined from a perch channel receiving SIR at the mobile station of a perch channel transmitted from said each base station, a perch channel transmission power at said each base station, and a target receiving SIR for a downlink communication channel at the mobile station.
Claim 15
Dependent Claim
81 words
The method of claim 13, wherein the secondary control signal notifies the perch channel receiving SIRs from the mobile station to the base station control station, the base station control station determines the upper and lower limits for the transmission power of each base station according to the secondary control signal, and the additional control signals notify the upper and lower limits for the transmission power of each base station from the base station control station to said each base station.
Claim 16
Dependent Claim
71 words
The method of claim 13, wherein the secondary control signal notifies the perch channel receiving SIRs from the mobile station to the base station control station, the additional control signals notify the perch channel receiving SIRs from the base station control station to each base station, and each base station determines the upper and lower limits for the transmission power of said each base station according to the additional control signals.
Claim 17
Dependent Claim
74 words
The method of claim 12, wherein the upper and lower limits for the transmission power of each base station are determined from a receiving SIR at the mobile station of a perch channel transmitted from one base station which has a smallest propagation loss with respect to the mobile station, a perch channel transmission power at said one base station, and a target receiving SIR for a downlink communication channel at the mobile station.
Claim 18
Dependent Claim
61 words
The method of claim 11, wherein the primary downlink transmission power control controls a transmission power of each base station, while the additional downlink transmission power control specifies a correction to the transmission power of at least one base station according to receiving SIRs at the mobile station of a perch channel and a communication channel transmitted from each base station.
Claim 19
Dependent Claim
58 words
The method of claim 17, wherein the secondary control signal notifies the correction for said at least one base station from the mobile station to the base station control station, and the additional control signals notify the correction for said at least one base station from the base station control station to said at least one base station.
Claim 20
Dependent Claim
33 words
The method of claim 17, wherein the correction corrects the transmission power of said at least one base station so as to make transmission powers of the base stations equal to each other.
Claim 21
Dependent Claim
52 words
The method of claim 17, wherein the correction corrects the transmission power of said at least one base station so as to make a desired transmission power ratio among the base stations according to a ratio of the receiving SIRs at the mobile station of perch channels transmitted from the base stations.
Claim 22
Dependent Claim
44 words
The method of claim 1, wherein the primary downlink transmission power control controls a transmission power of each base station independently, while the additional downlink transmission power control controls the transmission powers of the base stations to be identical during the site diversity period.
Claim 23
Dependent Claim
120 words
The method of claim 21, wherein each base station periodically reports to the base station control station a transmission power control amount due to the primary downlink transmission power control and a receiving reliability at said each base station during a prescribed period of time, the base station control station notifies one transmission power control amount reported from one base station which has a highest receiving reliability among the base stations to other base stations, and each other base station controls a transmission power at said each other base station by using said one transmission power control amount notified from the base station control station, so that the transmission powers of the base stations are controlled to be identical periodically.
Claim 24
Dependent Claim
73 words
The method of claim 21, wherein each base station periodically reports a transmission power value at said each base station to the base station control station, the base station control station notifies one transmission power value reported from one base station to other base stations, and each other base station controls a transmission power at said each other base station to said one transmission power value notified from the base station control station.
Claim 25
Dependent Claim
22 words
The method of claim 23, wherein said one transmission power value is largest among transmission power values reported from the base stations.
Claim 26
Dependent Claim
22 words
The method of claim 23, wherein said one transmission power value is smallest among transmission power values reported from the base stations.
Claim 27
Dependent Claim
147 words
A mobile communication system, comprising: a plurality of base stations; a mobile station to be connected with the base stations via radio channels, which transmits a primary control signal which is to be terminated at each base station and not to be combined during a site diversity period so as to carry out a primary downlink transmission power control at each base station according to the primary control signal; and a base station control station for controlling the base stations, which transmits additional control signals to the base stations so as to carry out an additional downlink transmission power control at the base stations according to the additional control signals; wherein the mobile communication system uses a site diversity in which the mobile station is simultaneously connected with more than one base stations and a diversity combining among said more than one base stations is carried out.
Claim 28
Dependent Claim
147 words
A mobile communication system, comprising: a plurality of base stations; a mobile station to be connected with the base stations via radio channels, which transmits a primary control signal which is to be terminated at each base station and not to be combined during a site diversity period so as to carry out a primary downlink transmission power control at each base station according to the primary control signal; and a base station control station for controlling the base stations, which transmits additional control signals to the base stations so as to carry out an additional downlink transmission power control at the base stations according to the additional control signals; wherein the mobile communication system uses a site diversity in which the mobile station is simultaneously connected with more than one base stations and a diversity combining among said more than one base stations is carried out.
Claim 29
Dependent Claim
28 words
The mobile communication system of claim 26, wherein the primary downlink transmission power control is carried out at shorter time intervals than the additional downlink transmission power control.
Claim 30
Dependent Claim
17 words
The mobile communication system of claim 26, wherein the primary control signal is a layer-1 control signal.
Claim 31
Dependent Claim
48 words
The mobile communication system of claim 26, wherein the mobile station also transmits a secondary control signal which is to be terminated at the base station control station and to be combined during the site diversity period, in order to carry out the additional downlink transmission power control.
Claim 32
Dependent Claim
17 words
The mobile communication system of claim 29, wherein the secondary control signal is a layer-3 control signal.
Claim 33
Dependent Claim
37 words
The mobile communication system of claim 29, wherein the primary downlink transmission power control is carried out during a non-site diversity period, while the additional downlink transmission power control is carried out during the site diversity period.
Claim 34
Dependent Claim
53 words
The mobile communication system of claim 31, wherein the mobile station transmits the primary control signal based on a receiving SIR of a communication channel at the mobile station, and the secondary control signal based on a bit error rate or a frame error rate of the communication channel at the mobile station.
Claim 35
Dependent Claim
47 words
The mobile communication system of claim 31, wherein the mobile station transmits the primary control signal based on a receiving SIR of a communication channel at the mobile station, and the secondary control signal based on a receiving SIR of a perch channel at the mobile station.
Claim 36
Dependent Claim
43 words
The mobile communication system of claim 31, wherein the mobile station transmits the primary control signal and the secondary control signal which are both based on a bit error rate or a frame error rate of a communication channel at the mobile station.
Claim 37
Dependent Claim
28 words
The mobile communication system of claim 31, wherein the mobile station stops a transmission of a bit corresponding to the primary control signal during the site diversity period.
Claim 38
Dependent Claim
30 words
The mobile communication system of claim 29, wherein the primary downlink transmission power control and the additional downlink transmission power control are both carried out during the site diversity period.
Claim 39
Dependent Claim
60 words
The mobile communication system of claim 36, wherein the primary downlink transmission power control controls a transmission power of each base station, while the additional downlink transmission power control sets upper and lower limits for the transmission power of each base station according to a receiving SIR at the mobile station of a perch channel transmitted from each base station.
Claim 40
Dependent Claim
67 words
The mobile communication system of claim 37, wherein the upper and lower limits for the transmission power of each base station are determined from a perch channel receiving SIR at the mobile station of a perch channel transmitted from said each base station, a perch channel transmission power at said each base station, and a target receiving SIR for a downlink communication channel at the mobile station.
Claim 41
Dependent Claim
83 words
The mobile communication system of claim 38, wherein the secondary control signal notifies the perch channel receiving SIRs from the mobile station to the base station control station, the base station control station determines the upper and lower limits for the transmission power of each base station according to the secondary control signal, and the additional control signals notify the upper and lower limits for the transmission power of each base station from the base station control station to said each base station.
Claim 42
Dependent Claim
73 words
The mobile communication system of claim 38, wherein the secondary control signal notifies the perch channel receiving SIRs from the mobile station to the base station control station, the additional control signals notify the perch channel receiving SIRs from the base station control station to each base station, and each base station determines the upper and lower limits for the transmission power of said each base station according to the additional control signals.
Claim 43
Dependent Claim
76 words
The mobile communication system of claim 37, wherein the upper and lower limits for the transmission power of each base station are determined from a receiving SIR at the mobile station of a perch channel transmitted from one base station which has a smallest propagation loss with respect to the mobile station, a perch channel transmission power at said one base station, and a target receiving SIR for a downlink communication channel at the mobile station.
Claim 44
Dependent Claim
63 words
The mobile communication system of claim 36, wherein the primary downlink transmission power control controls a transmission power of each base station, while the additional downlink transmission power control specifies a correction to the transmission power of at least one base station according to receiving SIRs at the mobile station of a perch channel and a communication channel transmitted from each base station.
Claim 45
Dependent Claim
60 words
The mobile communication system of claim 42, wherein the secondary control signal notifies the correction for said at least one base station from the mobile station to the base station control station, and the additional control signals notify the correction for said at least one base station from the base station control station to said at least one base station.
Claim 46
Dependent Claim
35 words
The mobile communication system of claim 42, wherein the correction corrects the transmission power of said at least one base station so as to make transmission powers of the base stations equal to each other.
Claim 47
Dependent Claim
54 words
The mobile communication system of claim 42, wherein the correction corrects the transmission power of said at least one base station so as to make a desired transmission power ratio among the base stations according to a ratio of the receiving SIRs at the mobile station of perch channels transmitted from the base stations.
Claim 48
Dependent Claim
46 words
The mobile communication system of claim 26, wherein the primary downlink transmission power control controls a transmission power of each base station independently, while the additional downlink transmission power control controls the transmission powers of the base stations to be identical during the site diversity period.
Claim 49
Dependent Claim
122 words
The mobile communication system of claim 46, wherein each base station periodically reports to the base station control station a transmission power control amount due to the primary downlink transmission power control and a receiving reliability at said each base station during a prescribed period of time, the base station control station notifies one transmission power control amount reported from one base station which has a highest receiving reliability among the base stations to other base stations, and each other base station controls a transmission power at said each other base station by using said one transmission power control amount notified from the base station control station, so that the transmission powers of the base stations are controlled to be identical periodically.
Claim 50
Dependent Claim
75 words
The mobile communication system of claim 46, wherein each base station periodically reports a transmission power value at said each base station to the base station control station, the base station control station notifies one transmission power value reported from one base station to other base stations, and each other base station controls a transmission power at said each other base station to said one transmission power value notified from the base station control station.
Claim 51
Dependent Claim
24 words
The mobile communication system of claim 48, wherein said one transmission power value is largest among transmission power values reported from the base stations.
Claim 52
Dependent Claim
24 words
The mobile communication system of claim 48, wherein said one transmission power value is smallest among transmission power values reported from the base stations.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-08-02 | 2003-02-01 | 2003-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-02 | 2007-02-01 | 2007-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-02 | 2011-02-01 | 2011-08-03 | $7700.00 | Window Closed / Lapsed |