US6590874B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for implementing outer loop power control in discontinuous transmission mode using explicit signalling
Assignee: Ericsson AB
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Filing: 1999-09-30
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Granted: 2003-07-08
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Expires: 2019-09-30
Abstract
Abstract A signalling method for controlling unnecessary power increases and call drop during discontinuous transmission (DTX) mode of a frame-based transmission system. The signalling 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
- 👤 David Paranchych
- 👤 Ashvin Chheda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:09
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/06; H04W52/12; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2628; H04B7/2637; H04W52/18; H04W52/28; H04W52/282; H04W52/283; H04W52/288; H04W52/38; H04W52/44
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
213 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: identifying one or more of a plurality of power control bits per frame as a DTX indicator recognized by a transmission protocol and logic within said system; determining when traffic is to be gated-off in a transmission; setting said DTX indicator to a first value, which indicates to a receiving unit when traffic in said frame is gated off, wherein the DTX indicator indicates normal traffic transmission when said DTX indicator is set to a second, different value; and transmitting said transmission with said DTX indicator to said receiving unit; receiving said DTX indicator at said receiving unit of said transmission system, said DTX indicator being included within a received frame and indicating whether the received frame was transmitted with normal traffic or without traffic due to a gating-off of traffic at a source unit prior to transmission of said frame; and controlling a change in the target bit energy to noise spectrum density ratio (Eb/No) of subsequent transmissions over said transmission system based on information obtained from the reading of said DTX indicator, wherein Eb/No is not increased when said DTX indicator indicates a gating-off of traffic has occurred.
Claim 2
Independent Claim
213 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: identifying one or more of a plurality of power control bits per frame as a DTX indicator recognized by a transmission protocol and logic within said system; determining when traffic is to be gated-off in a transmission; setting said DTX indicator to a first value, which indicates to a receiving unit when traffic in said frame is gated off, wherein the DTX indicator indicates normal traffic transmission when said DTX indicator is set to a second, different value; and transmitting said transmission with said DTX indicator to said receiving unit; receiving said DTX indicator at said receiving unit of said transmission system, said DTX indicator being included within a received frame and indicating whether the received frame was transmitted with normal traffic or without traffic due to a gating-off of traffic at a source unit prior to transmission of said frame; and controlling a change in the target bit energy to noise spectrum density ratio (Eb/No) of subsequent transmissions over said transmission system based on information obtained from the reading of said DTX indicator, wherein Eb/No is not increased when said DTX indicator indicates a gating-off of traffic has occurred.
Claim 3
Dependent Claim
47 words
The method of claim 1 , further comprising the steps of: analyzing said one or more bits at said receiver; and modifying a target Eb/No according to power control operation for normal traffic transmission when said one or more bit indicates a normal frame is being transmitted.
Claim 4
Dependent Claim
82 words
The method of claim 2 , further comprising the steps of: when said indicates that a gating-off of traffic has occurred, decoding said frame to determine whether or not there is normal traffic within the frame to reduce a possibility of error in said analyzing step; modifying a target (Eb/No) according to power control operation for normal traffic transmission when said frame is decoded correctly; maintaining a current target Eb/No when gating-off of normal traffic has been verified by said decoding step.
Claim 5
Dependent Claim
89 words
The method of claim 3 , further including the step of: initiating an operation to decode said frame as a normal traffic frame; when the frame is decoded as a normal traffic frame, asserting normal power control for a subsequent transmission to a target; and when the frame is not detected as a normal traffic frame, performing one of several power control operations from among maintaining a current target SNR and implementing an outer loop power control mechanism for receipt of a frame in which traffic has been gated-off.
Claim 6
Dependent Claim
20 words
The method of claim 1 , wherein said reading step detects both on a forward and a backward transmission path.
Claim 7
Dependent Claim
27 words
The method of claim 5 , wherein said reading step detects said indicator from within one of a dedicated control channel (DCCH) and a suppemenal channel (SCH).
Claim 8
Dependent Claim
63 words
The method of claim 1 , wherein said identifying step includes the step of implementing a time diversity transmission to enhance reliability of said signal, wherein said time diversity transmission utilizes a first and a second bit at different time locations within said frame, and wherein the first and second bits are coherently combined to determine if the traffic has been gated off.
Claim 9
Dependent Claim
120 words
The method for claim 1 , said method comprising: reading said DTX indicator from within a frame of a received transmission, wherein said indicator includes a bit that has one of two possible values including a first value indicating that the transmission includes normal traffic and a second value indicating that normal traffic has been gated off within the transmission; when said bit is set to said first value, modifying a power level of the target signal-to-noise ratio (SNR) according to normal traffic transmission power control mode; and when said bit is set to said second value, modifying a power level of the target SNR according to an operating mode where normal traffic is not being transmitted within a transmission.
Claim 10
Independent Claim
212 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 identifying one or more of a plurality of power control bits per frame as a DTX indicator recognized by a transmission protocol and logic within said system; means for determining when traffic is to be gated off in a transmission; and means for setting said DTX indicator to a first value, which indicates to a receiving unit when traffic in said frame is gated off, wherein the DTX indicator indicates normal traffic transmission when said DTX indicator is set to a second, different value; means for receiving said DTX indicator at said receiving unit of said transmission system, said DTX indicator being included within a received frame and indicating whether the received frame was transmitted with normal traffic or without traffic due to a gating-off of traffic at a source unit prior to transmission of said frame; and means for controlling a change in the target bit energy to noise spectrum density ratio (Eb/No) of subsequent transmissions over said transmission system based on information obtained from the reading of said indicator, wherein Eb/No is not increased when said DTX indicator indicates a gating-off of traffic has occurred.
Claim 11
Independent Claim
212 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 identifying one or more of a plurality of power control bits per frame as a DTX indicator recognized by a transmission protocol and logic within said system; means for determining when traffic is to be gated off in a transmission; and means for setting said DTX indicator to a first value, which indicates to a receiving unit when traffic in said frame is gated off, wherein the DTX indicator indicates normal traffic transmission when said DTX indicator is set to a second, different value; means for receiving said DTX indicator at said receiving unit of said transmission system, said DTX indicator being included within a received frame and indicating whether the received frame was transmitted with normal traffic or without traffic due to a gating-off of traffic at a source unit prior to transmission of said frame; and means for controlling a change in the target bit energy to noise spectrum density ratio (Eb/No) of subsequent transmissions over said transmission system based on information obtained from the reading of said indicator, wherein Eb/No is not increased when said DTX indicator indicates a gating-off of traffic has occurred.
Claim 12
Dependent Claim
49 words
The system of claim 9 , further comprising: means for analyzing said one or more bit at said receiving unit; and means for modifying a target Eb/No according to power control operation for normal traffic transmission when said one or more bit indicates a normal frame is being transmitted.
Claim 13
Dependent Claim
82 words
The system of claim 10 , further comprising: means, when said indicates that a gating-off of traffic has occurred, for initiating a decoding process to determine whether or not there is normal traffic within the frame to reduce a possibility of error in said analyzing step; modifying a target (Eb/No) according to power control operation for normal traffic transmission when said frame is decoded correctly; maintaining a current target Eb/No when gating-off of normal traffic has been verified by said decoding process.
Claim 14
Dependent Claim
94 words
The system of claim 11 , further comprising means for: means for initiating an operation to decode said frame as a normal traffic frame; when the frame is decoded as a normal traffic frame, means for asserting normal power control for a subsequent transmission to a target; and when the frame is not detected as a normal traffic frame, means for performing one of several power control operations from among maintaining a current target SNR and implementing an outer loop power control mechanism for receipt of a frame in which traffic has been gated-off.
Claim 15
Dependent Claim
20 words
The system of claim 9 , wherein said detecting means detects both on a forward and a backward transmission path.
Claim 16
Dependent Claim
33 words
The system of claim 13 , wherein said detecting means detects said signal indicating gating-off of traffic or normal traffic on one of a dedicated control channel (DCCH) and a supplemental channel (SCH).
Claim 17
Dependent Claim
62 words
The system of claim 9 , wherein said identifying means includes means for implementing a time diversity transmission to enhance reliability of said signal, wherein said time diversity transmission utilizes a first and a second bit at different time locations within said frame, and wherein the first and second bits are coherently combined to determine if the traffic has been gated off.
Claim 18
Dependent Claim
19 words
The method of claim 8 , wherein a default value of said indicator bit indicates transmission of normal traffic.
Claim 19
Dependent Claim
100 words
The method of claim 8 , wherein said bit is a first indicator bit and said method further comprises: providing a second indicator bit as a back-up bit to said indicator bit, wherein a time diversity transmission is established; and combining said first and second indicator bit at a receiving unit of said transmission; determining whether traffic has been gated off based on a resulting combination from said combining step, wherein an occurrence of an error due to reliance on said first bit is substantially reduce and a reliability of the power control method utilizing explicit signaling is substantially improved.
Claim 20
Dependent Claim
130 words
A communication unit for use within a CDMA communications system, said unit comprising: means for providing an explicit signal within a frame of a received transmission, wherein said explicit signal includes a bit that has one of two possible values including a first value indicating that the transmission includes normal traffic and a second value indicating that normal traffic has been gated off within the transmission; when said bit is set to said first value, means for modifying a power level of the target signal-to-noise ratio (SNR) according to normal traffic transmission power control mode; and when said bit is set to said second value, means for modifying the power level of the target SNR according to an operating mode where normal traffic is not being transmitted within a transmission.
Claim 21
Dependent Claim
130 words
A communication unit for use within a CDMA communications system, said unit comprising: means for providing an explicit signal within a frame of a received transmission, wherein said explicit signal includes a bit that has one of two possible values including a first value indicating that the transmission includes normal traffic and a second value indicating that normal traffic has been gated off within the transmission; when said bit is set to said first value, means for modifying a power level of the target signal-to-noise ratio (SNR) according to normal traffic transmission power control mode; and when said bit is set to said second value, means for modifying the power level of the target SNR according to an operating mode where normal traffic is not being transmitted within a transmission.
Claim 22
Dependent Claim
109 words
The communication unit of claim 18 , wherein said bit is a first bit among a plurality of bits, said communication unit further comprising: means for providing a second bit as a back-up bit to said first bit, wherein a time diversity transmission is established; means for combining said first and second bits at a receiving unit of said transmission; and means for determining whether traffic has been gated off based on a resulting combination from said combining means, wherein an occurrence of an error due to reliance on said first bit is substantially reduce and a reliability of the power control method utilizing explicit signaling is substantially improved.
Claim 23
Dependent Claim
100 words
The communication unit of claim 18 , further comprising: means for identifying one or more of a plurality of power control bits per frame as a DTX indicator recognized by a transmission protocol and logic within said system; means for determining when traffic is to be gated off in a transmission; means for setting said DTX indicator to a first value, which indicates to a receiving unit when traffic in said frame is gated off, wherein the DTX indicator indicates normal traffic transmission when set to a second, different value; and means for transmitting said transmission to another communication unit.
Claim 24
Dependent Claim
81 words
The communication unit of claim 20 , further comprising: when said indicates that a gating-off of traffic has occurred, verifying that said gating off has occurred by one of a plurality of methods from among: decoding said frame to determine whether or not there is normal traffic within the frame; and calculating a decision variable as a ratio of said SNR of said traffic and said SNR of a power control bit(PCB) and comparing the decision variable against a pre-established threshold.
Claim 25
Dependent Claim
15 words
The communication unit of claim 22 , wherein said communication unit is a mobile station.
Claim 26
Dependent Claim
15 words
The communication unit of claim 22 , wherein said communication unit is a base station.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-07-07 | 2007-01-06 | 2007-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-07-07 | 2011-01-06 | 2011-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-07-07 | 2015-01-06 | 2015-07-08 | $7700.00 | Window Closed / Lapsed |