Patent EP0977371A2 successfully refreshed from Google Patents.
EP0977371A2
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EP
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Power control technique utilizing forward pilot channel
Assignee: Nokia Oyj
•
Filing: 1999-07-30
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Granted: —
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Expires: 2019-07-30
Abstract
Abstract A method and system for providing efficient transmission power control commands to a base station. In a third generation IS-95 CDMA network, for example, cdma2000, the forward pilot channel is used to estimate the received signal power level. In the presently preferred embodiment, a mobile station measures the received pilot channel power, on a forward link pilot channel. The loss experienced on the pilot channel is estimated as the difference between the pilot channel power transmitted at the base station and the pilot channel power received at the mobile station. The pilot power transmission power is typically fixed based upon the operating environment of the base station. The fixed pilot channel transmission power can be transmitted via a message from the base station. Based on the estimated channel loss, the received traffic power is calculated as the difference between the initial traffic channel transmission power, that is, the power when the mobile station is assigned a traffic channel, and the estimated loss added to any power control gain corrections that have occurred. The initial traffic channel transmission power can be a default value or can be assigned by the base station using signaling messages, e.g., a forward common control channel (or F-CCCH) message. Power control decisions are made based on the ratio of received traffic channel energy with an estimate of interference and noise on the channel. A "power control decision" is made by comparing the ratio with a predetermined threshold to determine if the power level should be raised or lowered.
Inventors
- 👤 Lin Ma
- 👤 Zhigang Rong
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:00
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/06; H04W52/14; H04W52/143; H04W52/08; H04W52/18; H04W52/24; H04W52/243; H04W24/00; H04W24/10; H04W48/00; H04W48/08; H04W52/12; H04W52/38; H04W52/50
Claims Analysis
Total Claims: 63
Claim 1
Independent Claim
48 words
A method of forward link power control utilizing a pilot channel, comprising
the steps of: gaining knowledge of pilot channel power; estimating the received power of a traffic channel using said
knowledge; estimating the signal to noise ratio on said traffic channel; and generating a power control decision.
Claim 2
Dependent Claim
16 words
The method of Claim 1, wherein said power control decision is for a CDMA
2000 system.
Claim 3
Dependent Claim
22 words
The method of Claim 1 or 2 further comprising the step of correcting any
estimation errors using an outer-loop power control mechanism.
Claim 4
Dependent Claim
19 words
The method of Claim 1, 2 or 3 wherein said knowledge includes the
received power of said pilot channel.
Claim 5
Independent Claim
16 words
The method of any preceding Claim, wherein said pilot channel is received
by a mobile station.
Claim 6
Independent Claim
16 words
The method of any preceding Claim, wherein said pilot channel is
transmitted by a base station.
Claim 7
Independent Claim
22 words
The method of any preceding Claim, further comprising the step of
receiving a signal indicating the transmission power of said pilot channel.
Claim 8
Independent Claim
30 words
The method of any preceding Claim, wherein said estimating the
received power of a traffic channel step further comprises the step of
summing any forward link power control gain corrections.
Claim 9
Independent Claim
50 words
The method of any preceding Claim, wherein said estimating the
received power of a traffic channel step further comprises the step of
calculating the difference of the initial power of said traffic channel and said
loss on said pilot channel added to any power control gain corrections that
have occurred.
Claim 10
Independent Claim
23 words
The method of any preceding Claim, wherein said generating step
further comprises the step of calculating a signal to interference and noise
ratio.
Claim 11
Independent Claim
27 words
The method of any preceding Claim, wherein said generating step
further comprises the step of comparing a predetermined threshold to a signal
to interference and noise ratio.
Claim 12
Independent Claim
18 words
The method of any preceding Claim, wherein said power control
decision is a forward link power control decision.
Claim 13
Independent Claim
40 words
The method of any preceding Claim, wherein said power control
decision is to decrease the forward link gain if the ratio of the energy of said
traffic channel to an interference and noise value is greater than a
predetermined threshold.
Claim 14
Independent Claim
40 words
The method of any preceding Claim, wherein said power control
decision is to increase the forward link gain if the ratio of the energy of said
traffic channel to an interference and noise value is less than a predetermined
threshold.
Claim 15
Independent Claim
37 words
A method of forward link power control utilizing a pilot channel,
comprising the steps of: estimating the loss on a received pilot channel; estimating the received power of a traffic channel; and generating a power control decision.
Claim 16
Dependent Claim
16 words
The method of Claim 15, wherein said power control decision is for a
CDMA 2000 system.
Claim 17
Dependent Claim
20 words
The method of Claim 15 or 16, further comprising the step of
measuring the power of said received pilot channel.
Claim 18
Dependent Claim
18 words
The method of Claim 15, 16 or 17, wherein said pilot channel is
received at a mobile station.
Claim 19
Independent Claim
19 words
The method of any of Claims 15 to 18, wherein said pilot channel is
transmitted by a base station.
Claim 20
Independent Claim
39 words
The method of any of Claims 15 to 19, wherein said estimating the loss
step further comprises the step of calculating the difference between the
transmission power of said pilot channel and the received power of said pilot
channel.
Claim 21
Independent Claim
23 words
The method of any of Claims 15-20, further comprising the step of
receiving a signal indicating the transmission power of said pilot channel.
Claim 22
Independent Claim
22 words
The method of any of Claims 15 to 20, further comprising the step of
estimating the transmission power of said pilot channel.
Claim 23
Independent Claim
29 words
The method of any of Claims 15 to 22, further comprising the step of
receiving a signal from a base station indicating the transmission power of
said pilot channel.
Claim 24
Independent Claim
33 words
The method of any of Claims 15 to 23, wherein said estimating the
received power of a traffic channel step further comprises the step of
summing any forward link power control gain corrections.
Claim 25
Independent Claim
53 words
The method of any of Claims 15 to 24, wherein said estimating the
received power of a traffic channel step further comprises the step of
calculating the difference of the initial power of said traffic channel and said
loss on said pilot channel added to any power control gain corrections that
have occurred.
Claim 26
Independent Claim
21 words
The method of any of Claims 15 to 25, wherein said initial power of
said traffic channel is a default value.
Claim 27
Independent Claim
23 words
The method of any of Claims 15 to 26, wherein said initial power of
said traffic channel is assigned by a base station.
Claim 28
Independent Claim
23 words
The method of any of Claims 15 to 27, wherein said initial power of
said traffic channel is acquired through a signal message.
Claim 29
Independent Claim
23 words
The method of any of Claims 15 to 28, wherein said signal message is
a signal message on a forward common control channel.
Claim 30
Independent Claim
25 words
The method of any of Claims 15 to 29, wherein said generating step
further comprises the step of estimating the energy of said traffic channel.
Claim 31
Independent Claim
28 words
The method of any of Claims 15 to 30, wherein said generating step
further comprises the step of calculating an interference and noise value for
said traffic channel.
Claim 32
Dependent Claim
37 words
The method of Claim 31, wherein said generating step further
comprises the step of calculating an interference and noise value for said
traffic channel by despreading said pilot channel and calculating the variance
of the despreading output.
Claim 33
Dependent Claim
43 words
The method of Claim 31 or 32, wherein said generating step further
comprises the step of calculating an interference and noise value for said
traffic channel by compiling information based on the energy of the
despreading output of one unused Walsh code channel.
Claim 34
Independent Claim
34 words
The method of any of Claims 15 to 33, wherein said generating step
further comprises the step of calculating the ratio of the energy of said traffic
channel to an interference and noise value.
Claim 35
Dependent Claim
34 words
The method of Claim 34, wherein said generating step further
comprises the step of comparing a predetermined threshold to the ratio of the
energy of said traffic channel to an interference and noise value.
Claim 36
Independent Claim
21 words
The method of any of Claims 15 to 35, wherein said power control
decision is a forward link power control decision.
Claim 37
Independent Claim
43 words
The method of any of Claims 15 to 36, wherein said power control
decision is to decrease the forward link gain if the ratio of the energy of said
traffic channel to an interference and noise value is greater than a
predetermined threshold.
Claim 38
Independent Claim
43 words
The method of any of Claims 15 to 37, wherein said power control
decision is to increase the forward link gain if the ratio of the energy of said
traffic channel to an interference and noise value is less than a predetermined
threshold.
Claim 39
Independent Claim
76 words
A method of forward link power control utilizing a pilot channel,
comprising the steps of: measuring the received power of a pilot channel; estimating the power loss on said pilot channel; accumulating forward link power control gain adjustments; estimating the received power of a traffic channel; calculating a traffic channel energy value; calculating an interference and noise value; and generating a power control decision using said traffic channel energy
value and said interference and noise value.
Claim 40
Dependent Claim
16 words
The method of Claim 39, wherein said power control decision is for a
CDMA 2000 system.
Claim 41
Dependent Claim
17 words
The method of Claim 39 or 40, wherein said pilot channel is received at
a mobile station.
Claim 42
Dependent Claim
18 words
The method of Claim 39, 40 or 41, wherein said pilot channel is
transmitted by a base station.
Claim 43
Independent Claim
22 words
The method of any of Claims 39 to 42, further comprising the step of
estimating the transmission power of said pilot channel.
Claim 44
Independent Claim
33 words
The method of any of Claims 39 to 43, wherein said estimating the
received power of a traffic channel step further comprises the step of
summing any forward link power control gain corrections.
Claim 45
Independent Claim
34 words
The method of any of Claims 39 to 44, wherein said generating step
further comprises the step of calculating the ratio of the energy of said traffic
channel to an interference and noise value.
Claim 46
Independent Claim
38 words
The method of any of Claims 39 to 45, wherein said generating step
further comprises the step of comparing a predetermined threshold to the ratio
of the energy of said traffic channel to an interference and noise value.
Claim 47
Independent Claim
21 words
The method of any of Claims 39 to 46, wherein said power control
decision is a forward link power control decision.
Claim 48
Independent Claim
43 words
The method of any of Claims 39 to 47, wherein said power control
decision is to decrease the forward link gain if the ratio of the energy of said
traffic channel to an interference and noise value is greater than a
predetermined threshold.
Claim 49
Independent Claim
43 words
The method of any of Claims 39 to 48, wherein said power control
decision is to increase the forward link gain if the ratio of the energy of said
traffic channel to an interference and noise value is less than a predetermined
threshold.
Claim 50
Dependent Claim
57 words
A mobile station, comprising: at least one transmitter; at least one receiver; and a controller to control said at least one transmitter and said at least one
receiver; wherein said controller is configured to estimate the received power of
a traffic channel using knowledge of the power of a pilot channel and
generate a power control decision.
Claim 51
Dependent Claim
17 words
The mobile station of Claim 50, wherein said controller sums any
forward link power control gain corrections.
Claim 52
Dependent Claim
23 words
The mobile station of Claim 50 or 51, wherein said power control
decision is generated using a signal to interference and noise ratio.
Claim 53
Dependent Claim
30 words
The mobile station of any of Claims 50 to 52, wherein said power
control decision is generated by comparing a predetermined threshold to a
signal to interference and noise ratio.
Claim 54
Dependent Claim
22 words
The mobile station of any of Claims 50 to 53, wherein said power
control decision is a forward link power control decision.
Claim 55
Dependent Claim
44 words
The mobile station of any of Claims 50 to 54, wherein said power
control decision is to decrease the forward link gain if the ratio of the energy of
said traffic channel to an interference and noise value is greater than a
predetermined threshold.
Claim 56
Dependent Claim
42 words
The mobile station of any of Claims 50-55, wherein said power control
decision is to increase the forward link gain if the ratio of the energy of said
traffic channel to an interference and noise value is less than a predetermined
threshold.
Claim 57
Dependent Claim
63 words
A wireless communications system, comprising: at least one mobile station configured to estimate the loss on a
received pilot channel, estimate the received power of a traffic channel,
and generate a power control decision; and a base station configured to transmit information to said mobile station
and receive information from said mobile station for implementing
forward link power control using the pilot channel.
Claim 58
Dependent Claim
26 words
The system of Claim 57, wherein said received power of a traffic
channel is estimated using the sum of any forward link power control gain
corrections.
Claim 59
Dependent Claim
23 words
The system of Claim 57 or 58, wherein a signal to interference and
noise ratio is used to generate said power control decision.
Claim 60
Independent Claim
29 words
The system of any of Claims 57 to 59, wherein said power control
decision is made by comparing a predetermined threshold to a signal to
interference and noise ratio.
Claim 61
Independent Claim
21 words
The system of any of Claims 57 to 60, wherein said power control
decision is a forward link power control decision.
Claim 62
Independent Claim
35 words
The system of any of Claims 57 to 61, wherein said power control
decision is to decrease the forward link gain if a signal to interference and
noise ratio is greater than a predetermined threshold.
Claim 63
Independent Claim
35 words
The system of any of Claims 57 to 62, wherein said power control
decision is to increase the forward link gain if a signal to interference and
noise ratio is less than a predetermined threshold.
References Cited (Backward Citations)
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