EP0915632A2
Expired / Lapsed
EP
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Adaptive frequency channel assignment based on battery power level in wireless access protocols
Assignee: AT&T Inc
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Filing: 1998-10-16
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Granted: —
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Expires: 2018-10-16
Abstract
Abstract A method and system adapt scheduling priorities in a wireless communications system to conserve battery power in mobile stations operating within the system. A base station, within the system, receives battery power level information and other setup information from mobile stations operating within the service area of the base station during call setup procedures. Based on the battery power level information and other setup information, the base station assigns frequency channels to the mobile stations so that those mobile stations having battery power levels below a threshold value are assigned frequency channels that have lower interference levels than frequency channels assigned to other mobile stations. The frequency channel assignments are transmitted to the mobile stations.
Inventors
- 👤 Prathima Agrawal
- 👤 Shalinee Kishore
- 👤 Krishna M. Sivalingam
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:40
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/50; H04W72/54; H04W72/541; H04W52/00; H04W52/02; H04W52/0209; H04W52/0212; H04W52/0219; H04W52/0225; H04W52/0245; H04W52/0261; H04W72/51; H04W72/56; H04W72/566; H04W72/569; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
79 words
A method of managing mobile stations in a wireless network, comprising the steps
of: receiving, at a base station, a signal from a first mobile station that its battery power
is below a threshold value; assigning, at the base station, a frequency channel to the first mobile station that has
a lower interference level than frequency channels assigned to other mobile stations, in
response to receipt of the signal; and transmitting the assignment to the first and other stations.
Claim 2
Dependent Claim
24 words
The method of claim 1, wherein the interference level of each frequency channel is
based on the measured signal-to-interference ratio of each frequency channel.
Claim 3
Dependent Claim
43 words
The method of claim 1, further comprising the step of: changing at the base station a mobile transmission schedule to cause transmission
of messages from the first mobile station to occur before transmission of messages from
other stations, in response to the signal.
Claim 4
Dependent Claim
79 words
The method of claim 3, wherein the first mobile station has a high priority message
and a low priority message to transmit and the changing step comprises the steps of: causing transmission of the high priority message to occur before transmission of
high priority messages from other stations; and causing transmission of the low priority message to occur before transmission of
low priority messages from other stations, but not before the transmission of high priority
messages from other stations.
Claim 5
Dependent Claim
142 words
The method of claim 3, wherein the first mobile station has a first high priority
message and a first low priority message to transmit and having its battery power below a
first threshold value, the method further comprises the step of: receiving at a base station a signal from a second mobile station that its battery
power is below a second threshold value greater than the first threshold value, the
second mobile station having a second high priority message and a second low priority
message to transmit; and the changing step comprises the step of: causing transmission of the messages to be ordered with the first high priority,
followed by the second high priority, followed by high priority messages from other
stations, followed by the first low priority, followed by the second low priority, followed
by low priority messages from other stations.
Claim 6
Independent Claim
81 words
A method of managing mobile stations in a wireless network, comprising the steps
of: receiving, at a base station, a signal from each of a plurality of mobile stations, each
signal indicating a battery power level of a corresponding mobile station; assigning, at the base station, a frequency channel to each mobile station based on
the indicated battery power level of each mobile station and on the interference level of
each frequency channel; and transmitting the assignment to each mobile station.
Claim 7
Dependent Claim
65 words
The method of claim 6, wherein the assigning step comprises the steps of: assigning, at the base station, a frequency channel to each mobile station that has a
battery power level lower than a threshold value, so that each such mobile station is
assigned a frequency channel having a lower interference level than is assigned to a mobile
station having a higher battery power level.
Claim 8
Dependent Claim
24 words
The method of claim 6, wherein the interference level of each frequency channel is
based on the measured signal-to-interference ratio of each frequency channel.
Claim 9
Dependent Claim
52 words
The method of claim 6, further comprising the step of: changing at the base station a mobile transmission schedule to cause transmission
of messages from each mobile station having a battery power level lower than a threshold
value to occur before transmission of messages from other stations, in response to the
signal.
Claim 10
Dependent Claim
88 words
The method of claim 9, wherein a mobile station having a battery power level
lower than a threshold value has a high priority message and a low priority message to
transmit and the changing step comprises the steps of: causing transmission of the high priority message to occur before transmission of
high priority messages from other stations; and causing transmission of the low priority message to occur before transmission of
low priority messages from other stations, but not before the transmission of high priority
messages from other stations.
Claim 11
Dependent Claim
151 words
The method of claim 9, wherein a mobile station having a battery power level
lower than a threshold value has a first high priority message and a first low priority
message to transmit and having its battery power below a first threshold value, the method
further comprises the step of: receiving at a base station a signal from a second mobile station that its battery
power is below a second threshold value greater than the first threshold value, the
second mobile station having a second high priority message and a second low priority
message to transmit; and the changing step comprises the step of: causing transmission of the messages to be ordered with the first high priority,
followed by the second high priority, followed by high priority messages from other
stations, followed by the first low priority, followed by the second low priority, followed
by low priority messages from other stations.
Claim 12
Independent Claim
75 words
A system for managing mobile stations in a wireless network, comprising: means for receiving at a signal from a first mobile station that its battery power is
below a threshold value; means for assigning a frequency channel to the first mobile station that has a lower
interference level than frequency channels assigned to other mobile stations, in response to
receipt of the signal; and means for transmitting the assignment to the first and other stations.
Claim 13
Dependent Claim
24 words
The system of claim 12, wherein the interference level of each frequency channel is
based on the measured signal-to-interference ratio of each frequency channel.
Claim 14
Dependent Claim
38 words
The system of claim 12, further comprising: means for changing a mobile transmission schedule to cause transmission of
messages from the first mobile station to occur before transmission of messages from other
stations, in response to the signal.
Claim 15
Dependent Claim
81 words
The system of claim 14, wherein the first mobile station has a high priority message
and a low priority message to transmit and the changing means further comprises: means for causing transmission of the high priority message to occur before
transmission of high priority messages from other stations; and means for causing transmission of the low priority message to occur before
transmission of low priority messages from other stations, but not before the transmission
of high priority messages from other stations.
Claim 16
Dependent Claim
135 words
The system of claim 14, wherein the first mobile station having its battery power
below a first threshold value has a first high priority message and a first low priority
message to transmit, the system further comprises: means for receiving a signal from a second mobile station that its battery power is
below a second threshold value greater than the first threshold value, the second mobile
station having a second high priority message and a second low priority message to
transmit; and the changing means comprises: means for causing transmission of the messages to be ordered with the first high
priority, followed by the second high priority, followed by high priority messages from
other stations, followed by the first low priority, followed by the second low priority,
followed by low priority messages from other stations.
Claim 17
Independent Claim
76 words
A system for managing mobile stations in a wireless network, comprising: means for receiving a signal from each of a plurality of mobile stations, each signal
indicating a battery power level of a corresponding mobile station; means for assigning a frequency channel to each mobile station based on the
indicated battery power level of each mobile station and on the interference level of each
frequency channel; and means for transmitting the assignment to each mobile station.
Claim 18
Dependent Claim
60 words
The system of claim 17, wherein the assigning means comprises: means for assigning a frequency channel to each mobile station that has a battery
power level lower than a threshold value, so that each such mobile station is assigned a
frequency channel having a lower interference level than is assigned to a mobile station
having a higher battery power level.
Claim 19
Dependent Claim
24 words
The system of claim 17, wherein the interference level of each frequency channel is
based on the measured signal-to-interference ratio of each frequency channel.
Claim 20
Dependent Claim
47 words
The system of claim 17, further comprising: means for changing a mobile transmission schedule to cause transmission of
messages from each mobile station having a battery power level lower than a threshold
value to occur before transmission of messages from other stations, in response to the
signal.
Claim 21
Dependent Claim
88 words
The system of claim 20, wherein a mobile station having a battery power level
lower than a threshold value has a high priority message and a low priority message to
transmit and the changing means comprises: means for causing transmission of the high priority message to occur before
transmission of high priority messages from other stations; means for causing transmission of the low priority message to occur before
transmission of low priority messages from other stations, but not before the transmission
of high priority messages from other stations.
Claim 22
Dependent Claim
145 words
The system of claim 20, wherein a mobile station having a battery power level
lower than a threshold value has a first high priority message and a first low priority
message to transmit and having its battery power below a first threshold value, the system
further comprises: means for receiving a signal from a second mobile station that its battery power is
below a second threshold value greater than the first threshold value, the second mobile
station having a second high priority message and a second low priority message to
transmit; and the changing means comprises means for causing transmission of the messages to be ordered with the first high
priority, followed by the second high priority, followed by high priority messages from
other stations, followed by the first low priority, followed by the second low priority,
followed by low priority messages from other stations.
References Cited (Backward Citations)
No citation records indexed.
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