WO1995012257B1 - Apparatus and method for adapting a digital radiotelephone system to increased subscriber traffic - Google Patents
Apparatus and method for adapting a digital radiotelephone system to increased subscriber trafficInfo
- Publication number
- WO1995012257B1 WO1995012257B1 PCT/US1994/010997 US9410997W WO9512257B1 WO 1995012257 B1 WO1995012257 B1 WO 1995012257B1 US 9410997 W US9410997 W US 9410997W WO 9512257 B1 WO9512257 B1 WO 9512257B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data rate
- predetermined data
- signal
- subscriber
- vocoder
- Prior art date
Links
- 230000004301 light adaptation Effects 0.000 claims 2
- 238000001228 spectrum Methods 0.000 claims 1
- 230000001702 transmitter Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract 1
Abstract
A digital radiotelephone system employs vocoders (401, 403) to convert between analog speech and a digital format suitable for transmission via radio. Under most circumstances, the highest data rate is selected for optimum audio quality. When the system occupancy exceeds a particular threshold, as detected at the fixed site of the system, some or all of the vocoders (401, 403) are instructed to switch to a lower data rate to provide for an increase in the number of communication channels. Further, a portable subscriber unit (103, 111, 113) may autonomously change its vocoder data rate depending upon the charge state of its battery.
Claims
AMENDED CLAIMS
[received by the International Bureau on 19 April 1995 (19.04.95); original claims 1, 2, 7 and 9 amended; remaining claims unchanged (5 pages)]
1. A digital radiotelephone system including a fixed station, having a radio transceiver and a first vocoder to convert a first analog signal to a digital signal at a first predetermined data rate, for transmitting to and receiving from a radio coverage area to provide service to a plurality of subscriber units within the radio coverage area, a first subscriber unit of said plurality of subscriber units employing a second vocoder to convert a second analog signal to a digital signal at the first predetermined data rate, comprising: a system occupancy detector, coupled to the radio transceiver, which provides an output signal related to a number of the plurality of subscriber units actively receiving service from the fixed station in the radio coverage area; and a threshold detector which monitors said output signal and generates an instruction to at least one of the first and second vocoders to change from the first predetermined data rate to a second predetermined data rate.
2. A digital radiotelephone system in accordance with claim 1 further comprising a transmitter which conveys a signal from said threshold detector to the second vocoder via the fixed station.
3. A digital radiotelephone system in accordance with claim 1 wherein said threshold detector further comprises a first threshold which, when exceeded by said output signal, generates said instruction to said at least one of said first and second vocoders to reduce said first predetermined data rate to said second predetermined data rate.
4. A subscriber unit for a digital radiotelephone system having a fixed station with at least one radio transceiver and a first vocoder to convert a first analog signal to a digital signal at a first predetermined data rate to provide service to a plurality of subscriber units within a radio coverage area of the fixed station, each of the plurality of subscriber units employing a second vocoder to convert a second analog signal to a digital signal at the first predetermined data rate, the subscriber unit comprising: an operating parameter detector, whereby an operating characteristic of the subscriber unit is monitored and a signal generated when a predetermined threshold is crossed; and a resource controller which receives said signal from said operating parameter detector and which generates an instruction to at least one of the first and second vocoders to change from the first predetermined data rate to a second predetermined data rate.
5. A subscriber unit in accordance with claim 4 wherein said operating parameter detector further comprises a battery state of charge detector.
1 7
6. A digital radiotelephone system including a fixed station, having a radio transceiver and a first vocoder to convert a first analog signal to a digital signal at a first predetermined data rate, for transmitting to and receiving from a radio coverage area to provide service to a plurality of subscriber units within the radio coverage area, each subscriber unit employing a second vocoder to convert a second analog signal to a digital signal at the first predetermined data rate, comprising: a first group of subscriber units predeterminedly assigned a priority level; a system occupancy detector, coupled to the radio transceiver, which provides an output signal related to a number of the plurality of subscriber units actively receiving service from the digital radiotelephone system in the radio coverage area; a subscriber priority list and list scanner which selects said first group of subscriber units; and a threshold detector which monitors said output signal and generates an instruction to at least one of the first and second vocoders of a selected first priority subscriber unit to change from the first predetermined data rate to a second predetermined data rate.
1 8
7. A method of adaptation of a digital radiotelephone system to increased subscriber traffic, the digital radiotelephone system including a fixed station having a radio transceiver and a first vocoder to convert a first analog signal to a digital signal at a first predetermined data rate, for transmitting to and receiving from a radio coverage area to provide service to a plurality of subscriber units within the radio coverage area, a first subscriber unit, of said plurality of subscriber units, employing a second vocoder to convert a second analog signal to a digital signal at the first predetermined data rate, the method comprising the steps of: detecting spectrum occupancy at the radio transceiver and providing an output signal related to the number of the plurality of subscriber units actively receiving service from the fixed station in the radio coverage area; and generating an instruction, in response to said provided output signal, to at least one of the first and second vocoders to change from the first predetermined data rate to a second predetermined data rate.
8. A method in accordance with the method of claim 7 further comprising the step of generating said instruction to said at least one of said first and second vocoders to reduce said first predetermined data rate to said second predetermined data rate when said output signal exceeds a first threshold.
9. A method in accordance with the method of claim 8 further comprising the step of generating an instruction to said at least one of said first and second vocoders to increase the data rate from said second predetermined data rate to said first predetermined data rate when said output signal crosses a second threshold.
1 9
10. A method of adaptation of a subscriber unit employed in a digital radiotelephone system having a fixed station with at least one radio transceiver and a first vocoder to convert a first analog signal to a digital signal at a first predetermined data rate, the fixed station providing service to a plurality of subscriber units within a radio coverage area of the fixed station, each of the plurality of subscriber units employing a second vocoder to convert a second analog signal to a digital signal at the first predetermined data rate, the method comprising the steps of: detecting an operating parameter of the subscriber unit, whereby an operating characteristic is monitored and a signal generated when a predetermined threshold is crossed; and generating, in response to said signal, an instruction to at least one of the first and second vocoders to change from the first predetermined data rate to a second predetermined data rate.
2 0
STATEMENT UNDER ARTICLE 19
In the search report, claims 1-3 and 7-10 were indicated as lacking inventive step because of Patsiokas et al. (US-A- 5,203,012) and Hluchyj et al. (US-A-5,115,429) . The Patsiokas reference describes a system where a plurality of transceivers measures a received signal when a subscriber originates a call. The transceiver which receives the best signal is then assigned to handle the call. In Hluchyj, a network is described in which a congestion indicator is passed along with the data header in a landline network. The present invention teaches an apparatus and method which provides an output signal related to a number of the plurality of subscriber units. This is then used to determine if the vocoder rates are to be adjusted. This is not shown or taught by the Patsiokas or Hluchyj references.
Therefore, Applicants contend that ζlaims 1-3 and 7-10 are novel over those references.
The search report also indicated that claim 4 and 5 lack an inventive step in view of Bruckert (US-A-5,305,468) . In Bruckert, a signal received at the base site is measured and used for prediction. In the present invention, an operating characteristic of the subscriber unit is measured by an operating parameter detector of the subscriber unit. This is not shown or taught in the references and is believed to provide an inventive step over that which is shown.
21
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950702651A KR0171252B1 (en) | 1993-10-27 | 1994-09-29 | Apparatus and method for adapting a digital radiotelephone system to increased subscriber traffic |
EP94931781A EP0676102A4 (en) | 1993-10-27 | 1994-09-29 | Apparatus and method for adapting a digital radiotelephone system to increased subscriber traffic. |
JP7512638A JPH08505511A (en) | 1993-10-27 | 1994-09-29 | Apparatus and method for adapting a digital wireless telephone system to increasing subscriber traffic |
AU80730/94A AU8073094A (en) | 1993-10-27 | 1994-09-29 | Apparatus and method for adapting a digital radiotelephone system to increased subscriber traffic |
BR9405976A BR9405976A (en) | 1993-10-27 | 1994-09-29 | Subscriber unit digital radiotelephony system for the same adaptation process of digital radiotelephony system and subscriber unit adaptation process |
FI953184A FI953184A0 (en) | 1993-10-27 | 1995-06-27 | Device and method for adapting a digital mobile telephone system to increased subscriber traffic |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/144,166 US5649299A (en) | 1993-10-27 | 1993-10-27 | Apparatus and method for adapting a digital radiotelephone system to increased subscriber traffic |
US08/144,166 | 1993-10-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1995012257A1 WO1995012257A1 (en) | 1995-05-04 |
WO1995012257B1 true WO1995012257B1 (en) | 1995-05-18 |
Family
ID=22507382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/010997 WO1995012257A1 (en) | 1993-10-27 | 1994-09-29 | Apparatus and method for adapting a digital radiotelephone system to increased subscriber traffic |
Country Status (11)
Country | Link |
---|---|
US (1) | US5649299A (en) |
EP (1) | EP0676102A4 (en) |
JP (1) | JPH08505511A (en) |
KR (1) | KR0171252B1 (en) |
CN (1) | CN1116023A (en) |
AU (1) | AU8073094A (en) |
BR (1) | BR9405976A (en) |
FI (1) | FI953184A0 (en) |
FR (1) | FR2711883B1 (en) |
RU (1) | RU2119256C1 (en) |
WO (1) | WO1995012257A1 (en) |
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US9564963B2 (en) | 1995-06-30 | 2017-02-07 | Interdigital Technology Corporation | Automatic power control system for a code division multiple access (CDMA) communications system |
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1993
- 1993-10-27 US US08/144,166 patent/US5649299A/en not_active Expired - Lifetime
-
1994
- 1994-09-29 EP EP94931781A patent/EP0676102A4/en not_active Withdrawn
- 1994-09-29 BR BR9405976A patent/BR9405976A/en not_active Application Discontinuation
- 1994-09-29 WO PCT/US1994/010997 patent/WO1995012257A1/en not_active Application Discontinuation
- 1994-09-29 JP JP7512638A patent/JPH08505511A/en active Pending
- 1994-09-29 AU AU80730/94A patent/AU8073094A/en not_active Abandoned
- 1994-09-29 CN CN94190836A patent/CN1116023A/en active Pending
- 1994-09-29 RU RU95112489A patent/RU2119256C1/en active
- 1994-09-29 KR KR1019950702651A patent/KR0171252B1/en not_active IP Right Cessation
- 1994-10-21 FR FR9412600A patent/FR2711883B1/en not_active Expired - Fee Related
-
1995
- 1995-06-27 FI FI953184A patent/FI953184A0/en unknown
Cited By (1)
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US9564963B2 (en) | 1995-06-30 | 2017-02-07 | Interdigital Technology Corporation | Automatic power control system for a code division multiple access (CDMA) communications system |
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