EP1089456A2
Expired / Lapsed
EP
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Outer loop power control in discontinuous transmission mode
Assignee: Nortel Networks Ltd
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Filing: 2000-09-29
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Granted: —
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Expires: 2020-09-29
Abstract
Abstract A method for controlling unnecessary power increases and call drop during discontinuous transmission (DTX) mode of a frame-based transmission system. The method comprises the steps of (1) detecting, at a receiver end of the transmission system a status of a transmitted frame indicating one of two possible transmission modes including (a) when a gating-off of the traffic channel occurs, and (b) when no gating-off of traffic occurs and normal traffic is being transmitted, and (2) controlling a change in the receiver target bit energy to noise spectrum density ratio Eb/No in response to the detection step so that a receiver target Eb/No is increased only when the detecting step does not indicate a gating-off of traffic has occurred.
Inventors
- 👤 Yiping Wang
- 👤 Paranchych
- 👤 Ashvin Chheda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:35
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/06; H04W52/12; H04W52/18; H04W52/20; H04W52/24; H04W52/28; H04W52/282; H04W52/283; H04W52/288; H04W52/38; H04W52/44
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A method for controlling unnecessary power increases
and call drop during discontinuous transmission (DTX)
mode of a frame-based transmission system, said method
comprising the steps of: detecting at a receiver end of said transmission
system a status of a transmitted frame, said status
indicating one of two possible transmission modes
including (1) when a gating-off of traffic occurs, and
(2) when no gating-off of traffic occurs and normal
traffic is being transmitted; and controlling a change in said target bit energy to
noise spectrum density ratio (Eb/No) in response to said
detection step, wherein a target bit energy to noise
spectrum density ratio is increased only when said
detecting step does not indicate a gating-off of traffic
has occurred.
Claim 2
Dependent Claim
60 words
The method of Claim 1, wherein said detecting step
includes the steps of: calculating a ratio of a traffic signal-to-noise
(SNR) value to a SNR of a power control bit over a frame
period; establishing a threshold value correlated to a point
above which said ratio indicates a normal frame is being
transmitted; and comparing said ratio with said threshold.
Claim 3
Dependent Claim
20 words
The method of Claim 2, further comprising the step
of decreasing a target Eb/No when said frame is correctly
decoded.
Claim 4
Dependent Claim
34 words
The method of Claim 3, further comprising the steps
of: decoding said frame to determine if said comparing
step resulted in an error; and decreasing said target Eb/No when said frame is
decoded correctly.
Claim 5
Dependent Claim
35 words
The method of Claim 4, further including the step of
implementing an outer loop power control mechanism based
on a reception of something other than traffic frames,
when said decoding step indicates a bad frame.
Claim 6
Independent Claim
20 words
The method of any preceding Claim, wherein said
detecting step detects both on a forward and a backward
transmission path.
Claim 7
Dependent Claim
18 words
The method of Claim 6, wherein said detecting step
detects said gating-off on a dedicated control channel
(DCCH).
Claim 8
Dependent Claim
17 words
The method of Claim 6, wherein said detecting step
detects said gating-off on a supplemental channel (SCH).
Claim 9
Independent Claim
120 words
A system for controlling unnecessary power increases
and call drop during discontinuous transmission (DTX)
mode of a frame-based transmission system, said system
comprising: means for detecting at a receiver end of said
transmission system a status of a transmitted frame, said
status indicating one of two possible transmission modes
including (1) when a gating-off of traffic occurs, and
(2) when no gating-off of traffic occurs and normal
traffic is being transmitted; and means for controlling a change in said target bit
energy to noise spectrum density ratio (Eb/No) in
response to said detection step, wherein a target bit
energy to noise spectrum density ratio is increased only
when said detecting step does not indicate a gating-off
of traffic has occurred.
Claim 10
Dependent Claim
63 words
The system of Claim 9, wherein said detecting means
includes: means for calculating a ratio of a traffic signal-to-noise
(SNR) value to a SNR of a power control bit over
a frame period; means for establishing a threshold value correlated
to a point above which said ratio indicates a normal
frame is being transmitted; and means for comparing said ratio with said threshold.
Claim 11
Dependent Claim
18 words
The system of Claim 10, further comprising means for
decreasing target (Eb/No) when said frame is correctly
decoded.
Claim 12
Dependent Claim
42 words
The system of Claim 11, further comprising: means for decoding said frame to determine if said
comparing step resulted in an error; and means for decreasing said target bit energy to noise
spectrum density ratio (Eb/No) when said frame is decoded
correctly.
Claim 13
Dependent Claim
35 words
The system of Claim 12, further comprising the means
for implementing an outer loop power control mechanism
based on a reception of something other than traffic
frames, when said decoding means indicates a bad frame.
Claim 14
Independent Claim
24 words
The system of any one of Claims 9 to 13, wherein
said detecting means detects both on a forward and a
backward transmission path.
Claim 15
Dependent Claim
18 words
The system of claim 14, wherein said detecting means
detects said gating-off on a dedicated control channel
(DCCH).
Claim 16
Dependent Claim
17 words
The system of Claim 14, wherein said detecting means
detects said gating-off on a supplemental channel (SCH).
References Cited (Backward Citations)
No citation records indexed.
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