EP0946070A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of controlling transmission power in cellular system and base station apparatus
Assignee: NEC Corp
•
Filing: 1999-03-25
•
Granted: —
•
Expires: 2019-03-25
Abstract
Abstract A signal is prevented from being transmitted from a mobile station to a base station with excessive transmission power for thereby increasing an uplink capacity. The base station compares the reception quality of the signal transmitted from the mobile station with the target reception quality, and determines an increment for the transmission power of the base station based on a compared result. The base station adds the increment to the transmission power of the base station based on a second control command transmitted from the mobile station, and transmits a first control command for controlling the transmission power of the mobile station with the transmission power to which the increment has been added. If the reception quality of the signal transmitted from the mobile station becomes greater than the target reception quality, then the increment for the transmission power is increased. If the reception quality of the signal transmitted from the mobile station becomes smaller than the target reception quality, then the increment for the transmission power is reduced.
Inventors
- 👤 Kojiro Hamabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 23:24
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/30; H04W52/36; H04W52/362; H04W52/02; H04W52/0209; H04W52/0212; H04W52/0225; H04W52/0245; H04W52/38; H04W52/40; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
179 words
A method of controlling transmission power in
a cellular system having a plurality of cells, a
plurality of base stations disposed respectively in the
cells, and a mobile station disposed in one of the
cells and having a link established with one or more of
said base stations for communicating therewith with a
transmission power based on a first control command
transmitted from the base station, comprising the steps
of: determining transmission power of the base
stations based on a second control command transmitted
from the mobile station; measuring the reception quality in the base stations
of a signal transmitted from the mobile station; comparing the measured reception quality with the
target reception quality; determining an increment for the transmission
power of the base stations which has been determined
based on said second control command, based on a
compared result; incrementing the transmission power of the base
stations by the determined increment; and transmitting the first control command for
controlling transmission power of the mobile station
from the base stations to the mobile station, with the
incremented transmission power.
Claim 2
Dependent Claim
55 words
A method according to claim 1, wherein when
first command signals are received from the base
stations, the transmission power is controlled in the
mobile station based on one of said first command
signals which has at least a predetermined level of
reception quality and/or serves to minimize the
transmission power of the mobile station.
Claim 3
Dependent Claim
54 words
A method according to claim 1 or 2, wherein said
reception quality is represented by a power ratio
between reception power in the base stations of a
signal transmitted from said mobile station and the
interference power, and said increment is increased by
a ratio between said power ratio and a target power
ratio.
Claim 4
Independent Claim
45 words
A method according to any one of claims 1 to 3, wherein if
said ratio between said power ratio and said target
power ratio is greater than 1, then said increment is
set to said ratio between said power ratio and said
target power ratio.
Claim 5
Independent Claim
50 words
A method according to any one of claims 1 to 4, wherein said
reception quality is represented by the reception power
in the base stations of a signal transmitted from said
mobile station, and said increment is increased by a
ratio between said reception power and said target
reception power.
Claim 6
Independent Claim
37 words
A method according to any one of claims 1 to 5, wherein if
said transmission power incremented by said increment
is greater than predetermined maximum power, then said
transmission power is set to said predetermined maximum
power.
Claim 7
Independent Claim
95 words
A method according to any one of claims 1 to 6, wherein said
reception quality is represented by a power ratio
between reception power in the base stations of a
signal transmitted from said mobile station and the
interference power, and wherein if said power ratio is
greater than a level which is greater than a target
power ratio by a predetermined value, then said
increment is increased, and if said power ratio is
smaller than a level which is greater than a target
power ratio by a predetermined value, then said
increment is reduced.
Claim 8
Independent Claim
86 words
A method according to any one of claims 1 to 6, wherein said
reception quality is represented by the reception power
in the base stations of a signal transmitted from said
mobile station, and wherein if said reception power is
greater than a level which is greater than target
reception power by a predetermined value, then said
increment is increased, and if said reception power is
smaller than a level which is greater than target
reception power by a predetermined value, then said
increment is reduced.
Claim 9
Independent Claim
145 words
A method according to any one of claims 1 to 6, wherein said
reception quality is represented by a power ratio
between the reception power in the base stations of a
signal transmitted from said mobile station and the
interference power, and wherein if a propagation loss
with said mobile station is not a minimum among the base
stations having respective links established with the
mobile station and also if said power ratio is greater
than a level which is greater than a target power ratio
by a predetermined value, then said increment is
increased, and if a propagation loss with said mobile
station is minimum among the base stations having
respective links established with the mobile station
and if said power ratio is smaller than a level which
is greater than a target power ratio by a predetermined
value, then said increment is reduced.
Claim 10
Independent Claim
134 words
A method according to any one of claims 1 to 6, wherein said
reception quality is represented by the reception power
in the base stations of a signal transmitted from said
mobile station, and wherein if a propagation loss with
said mobile station is not minimum among the base
stations having respective links established with the
mobile station and also if said reception power is
greater than a level which is greater than target
reception power by a predetermined value, then said
increment is increased, and if a propagation loss with
said mobile station is minimum among the base stations
having respective links established with the mobile
station and if said reception power is smaller than a
level which is greater than target reception power by a
predetermined value, then said increment is reduced.
Claim 11
Independent Claim
56 words
A method according to any one of claims 1 to 10, wherein if
said increment is greater than a predetermined maximum
value, then said increment is set to said predetermined
maximum value, and if said increment is of a value for
not increasing said transmission power, then said
transmission power is not incremented by said
increment.
Claim 12
Independent Claim
37 words
A method according to any one of claims 1 to 11, wherein a
signal to be transmitted from said base stations to
said mobile stations is transmitted with power with
which said first control command is transmitted.
Claim 13
Independent Claim
210 words
A method of controlling the transmission power in
a cellular system having a plurality of cells, a
plurality of base stations disposed respectively in the
cells, and a mobile station disposed in one of the
cells and having a link established with at least one of
said base stations for communicating therewith, by
setting the transmission power from the base stations to a
level which is the sum of the transmission power determined
by a closed loop in the cellular system and an
increment added thereto, and transmitting a signal from
the base stations to the mobile stations with the
transmission power thus set, comprising the steps of: measuring the reception quality of a signal
transmitted from said mobile station; comparing the measured reception quality with a
value which is the sum of the target reception quality and
a predetermined value added thereto; if the measured reception quality is greater than
said value which is the sum of the target reception
quality and the predetermined value added thereto,
adding a predetermined additive value to said
increment; and if the measured reception quality is smaller than
said value which is the sum of the target reception
quality and the predetermined value added thereto,
subtracting a predetermined subtractive value from said
increment.
Claim 14
Dependent Claim
39 words
A method according to claim 13, wherein if
said increment is greater than a predetermined value,
then said increment is set to a maximum, and if said
increment is smaller than 0, then said increment is set
to 0.
Claim 15
Dependent Claim
166 words
A base station apparatus comprising: transmitting means for transmitting a first
control command for controlling the transmission power of a
mobile station disposed in a cell, to the mobile
station; receiving means for receiving a signal transmitted
from said mobile station; reception quality measuring means for measuring the
reception quality of a signal received by said
receiving means, and comparing the measured reception
quality with the target reception quality; and transmission power controlling means for
determining the power with which to transmit said first
control command, based on a second control command
contained in a signal received by said receiving
means, determining an increment for the transmission power
determined based on said second control command, based
on a compared result from said reception quality
measuring means, and incrementing the transmission
power based on said second control command by said
increment; said transmitting means comprising means for
transmitting said first control command to said mobile
station with the transmission power incremented by said
transmission power controlling means.
Claim 16
Dependent Claim
33 words
A base station apparatus according to claim
15, wherein said transmission power controlling means
comprises means for determining said first control
command based on the compared result from said
reception quality measuring means.
Claim 17
Dependent Claim
59 words
A base station apparatus according to claims
15 or 16, wherein said transmission power controlling means
comprises means for representing the reception quality
with a power ratio between the reception power of a signal
transmitted from said mobile station and the interference
power, and increasing said increment by a ratio between
said power ratio and a target power ratio.
Claim 18
Dependent Claim
53 words
A base station apparatus according to any one of claims 15 to
17, wherein said transmission power controlling means
comprises means for representing the reception quality
with reception power of a signal transmitted from said
mobile station, and increasing said increment by a
ratio between said reception power and the target reception
power.
Claim 19
Dependent Claim
95 words
A base station apparatus according to any one of claims 15 to
18, wherein said transmission power controlling means
comprises means for representing the reception quality
with a power ratio between the reception power of a signal
transmitted from said mobile station and the interference
power, increasing said increment if said power ratio is
greater than a level which is greater than the target
power ratio by a predetermined value, and reducing said
increment if said power ratio is smaller than a level
which is greater than a target power ratio by a
predetermined value.
Claim 20
Dependent Claim
87 words
A base station apparatus according to any one of claims 15 to
19, wherein said transmission power controlling means
comprises means for representing the reception quality
with the reception power of a signal transmitted from said
mobile station, increasing said increment if said
reception power is greater than a level which is
greater than the target reception power by a predetermined
value, and reducing said increment if said reception
power is smaller than a level which is greater than the
target reception power by a predetermined value.
Claim 21
Dependent Claim
145 words
A base station apparatus according to any one of claims 15 to
20, wherein said transmission power controlling means
comprises means for representing the reception quality
with a power ratio between the reception power of a signal
transmitted from said mobile station and the interference
power, increasing said increment if the propagation loss
with said mobile station is not a minimum among the base
stations having respective links established with the
mobile station and also if said power ratio is greater
than a level which is greater than a target power ratio
by a predetermined value, and reducing said increment
if a propagation loss with said mobile station is a
minimum among the base stations having respective links
established with the mobile station and if said power
ratio is smaller than a level which is greater than the
target power ratio by a predetermined value.
Claim 22
Dependent Claim
137 words
A base station apparatus according to any one of claims 15 to
21, wherein said transmission power controlling means
comprises means for representing the reception quality
with the reception power of a signal transmitted from said
mobile station, increasing said increment if the
propagation loss with said mobile station is not a
minimum among the base stations having respective links
established with the mobile station and also if said
reception power is greater than a level which is
greater than the target reception power by a predetermined
value, and reducing said increment if the propagation
loss with said mobile station is a minimum among the base
stations having respective links established with the
mobile station and if said reception power is smaller
than a level which is greater than the target reception
power by a predetermined value.
Claim 23
Dependent Claim
41 words
A base station apparatus according to any one of claims 15 to
22, wherein said transmitting means comprises means for
transmitting a signal to be transmitted to said mobile
station with the power with which said first control
command is transmitted.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.