US5455967A
Expired / Lapsed
US
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Mobile communication system and transmission power control method for a base station therein
Assignee: Canon Inc
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Filing: 1994-03-03
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Granted: 1995-10-03
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Expires: 2014-03-03
Abstract
Abstract A received power preset value is varied in such a manner that SIR measured at the base station comes to coincide with the target value SIRt. By varying the received power preset value, a cell zone of the base station varies so that the number of mobile stations connected with the base station increases or decreases thereby SIR at each base station approximating with each other. As a result, deviation of communication quality is restricted so that efficiency of the system can be improved.
Inventors
- 👤 Yasuharu Amezawa
- 👤 Shinichi Sato
- 👤 Kohji Takeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:13
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/02; H04W16/06; H04W52/00; H04W52/04; H04W52/18; H04W52/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
224 words
A base station in a mobile communication system, which is connected and communicated with mobile stations supervised by the base station in a cell zone, the base station comprising: (a) a communication quality processing unit for calculating a signal to interference power ratio (SIRr) of the base station at each of predetermined intervals of time in accordance with a received power preset value S(i) of the base station and a total received power of the base station derived at each of said predetermined intervals of time; (b) a renewal amount processing unit for calculating a renewal amount (ΔP) in relation to a formula ΔP=f (SIRt-SIRr) in accordance with a preset target value (SIRt) and the signal to interference power ratio (SIRr), where f(x) is an increasing function passing through a predetermined origin of coordinates; (c) a received power preset value renewal processing unit for calculating a renewed received power preset value S(i+1) in relation to a formula S(i+1)=S(i)+ΔP in accordance with the received power preset value S(i) of the base station at a just preceding time and the renewal amount (ΔP); and (d) a transmission power control unit for transmitting a transmission power control command to the mobile stations supervised by the base station so that a received power of the base station comes to coincide with the renewed received power preset value S(i+1).
Claim 2
Dependent Claim
224 words
A base station in a mobile communication system, which is connected and communicated with mobile stations supervised by the base station in a cell zone, the base station comprising: (a) a communication quality processing unit for calculating a signal to interference power ratio (SIRr) of the base station at each of predetermined intervals of time in accordance with a received power preset value S(i) of the base station and a total received power of the base station derived at each of said predetermined intervals of time; (b) a renewal amount processing unit for calculating a renewal amount (ΔP) in relation to a formula ΔP=f (SIRt-SIRr) in accordance with a preset target value (SIRt) and the signal to interference power ratio (SIRr), where f(x) is an increasing function passing through a predetermined origin of coordinates; (c) a received power preset value renewal processing unit for calculating a renewed received power preset value S(i+1) in relation to a formula S(i+1)=S(i)+ΔP in accordance with the received power preset value S(i) of the base station at a just preceding time and the renewal amount (ΔP); and (d) a transmission power control unit for transmitting a transmission power control command to the mobile stations supervised by the base station so that a received power of the base station comes to coincide with the renewed received power preset value S(i+1).
Claim 3
Dependent Claim
29 words
A base station set forth in claim 1, wherein the base station performs communications with the mobile stations in accordance with a code division multiple access (CDMA) communication scheme.
Claim 4
Dependent Claim
25 words
A base station set forth in claim 1, wherein the target value (SIRt) is a predetermined value determined at a designing stage of the system.
Claim 5
Dependent Claim
63 words
A base station set forth in claim 1, wherein the received power preset value renewal processing unit sets the renewal received power preset value S(i+1) to an upper limit value P max or a lower limit value P min when the value S(i+1) exceeds the upper limit value P max or the lower limit value P min of the received power preset value.
Claim 6
Dependent Claim
26 words
A base station set forth in claim 1, wherein the function f(x) is a linear function with a slope 1 passing through the origin of coordinates.
Claim 7
Dependent Claim
34 words
A base station set forth in claim 1, wherein the target value (SIRt) is an average value of a signal to interference power ratio between a focused base station and its adjacent base stations.
Claim 8
Dependent Claim
181 words
A transmission power control method for a mobile communication system comprising the steps of: (a) calculating a signal to interference power ratio (SIRr) of a base station at each of predetermined intervals of time in accordance with a received power preset value S(i) of the base station and a total received power of the base station derived at each of said predetermined intervals of time; (b) calculating a renewal amount (ΔP) in relation to a formula ΔP=f (SIRt-SIRr) in accordance with a preset target value (SIRt) and the signal to interference power ratio (SIRr), where f(x) is an increasing function passing through a predetermined origin of coordinates; (c) calculating a renewed received power preset value S(i+1) in relation to a formula S(i+1)=S(i)+ΔP in accordance with the received power preset value S(i) of the base station at a just preceding time and the renewal amount (ΔP); and (d) transmitting a transmission power control command to mobile stations supervised by the base station so that a received power of the base station comes to coincide with the renewed received power preset value S(i+1).
Claim 9
Dependent Claim
181 words
A transmission power control method for a mobile communication system comprising the steps of: (a) calculating a signal to interference power ratio (SIRr) of a base station at each of predetermined intervals of time in accordance with a received power preset value S(i) of the base station and a total received power of the base station derived at each of said predetermined intervals of time; (b) calculating a renewal amount (ΔP) in relation to a formula ΔP=f (SIRt-SIRr) in accordance with a preset target value (SIRt) and the signal to interference power ratio (SIRr), where f(x) is an increasing function passing through a predetermined origin of coordinates; (c) calculating a renewed received power preset value S(i+1) in relation to a formula S(i+1)=S(i)+ΔP in accordance with the received power preset value S(i) of the base station at a just preceding time and the renewal amount (ΔP); and (d) transmitting a transmission power control command to mobile stations supervised by the base station so that a received power of the base station comes to coincide with the renewed received power preset value S(i+1).
Claim 10
Dependent Claim
29 words
A transmission power control method set forth in claim 7, wherein the method is applied to the mobile communication system in a code division multiple access (CDMA) communication scheme.
Claim 11
Dependent Claim
34 words
A transmission power control method set forth in claim 7, wherein the system performs communications between the base station and the mobile stations in accordance with a code division multiple access (CDMA) communication scheme.
Claim 12
Dependent Claim
58 words
A transmission power control method set forth in claim 7, wherein the renewal received power preset value S(i+1) is set to an upper limit value P max or a lower limit value P min when the value S(i+1) exceeds the upper limit value P max or the lower limit value P min of the received power preset value.
Claim 13
Dependent Claim
28 words
A transmission power control method set forth in claim 7, wherein the function f(x) is a linear function with a slope 1 passing through the origin of coordinates.
Claim 14
Dependent Claim
36 words
A transmission power control method set forth in claim 7, wherein the target value (SIRt) is an average value of a signal to interference power ratio between a focused base station and its adjacent base stations.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-02 | 1999-04-03 | 1999-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-02 | 2003-04-03 | 2003-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-02 | 2007-04-03 | 2007-10-03 | $7700.00 | Window Closed / Lapsed |