Patent US6374098B1 successfully refreshed from Google Patents.
US6374098B1
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Systems and methods for locating remote units operating in a radiocommunication system using an adjunct system
Assignee: Ericsson Inc
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Filing: 1997-04-22
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Granted: 2002-04-16
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Expires: 2017-04-22
Abstract
Abstract Emergency call handling may, in the near future, require terminal unit location information to be provided to emergency service centers. Independent or quasi-independent systems, sometimes referred to as adjunct systems, can be provided to monitor remote unit transmissions and derive location information for mobile units making emergency access therefrom. Techniques for determining which channels each adjunct receive shall monitor are described herein, as well as specific monitoring techniques. Moreover, the adjunct system can use the received information to provide a second speech path to an emergency service center.
Inventors
- 👤 Alex K. Raith
- 👤 R. David Koilpillai
- 👤 Gregory E. Bottomley
- 👤 Havish Koorapaty
- 👤 Rajaram Ramesh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:00
CPC Classifications
H; H04; H04W; H04W4/00; H04W4/90; H04W76/00; H04W76/50
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
105 words
A method for monitoring system accesses to a radiocommunication system using an adjunct receiver comprising the steps of: listening, by said adjunct receiver, to channel frequencies associated with said system; evaluating, for channel frequencies on which transmissions are received by said adjunct receiver, whether said channel is a control channel or a traffic channel; sending, to a central processing center, an identification of control channels which said adjunct receiver is able to monitor; receiving, from said central processing center, an indication of which of said identified control channels said adjunct receiver is to monitor; and monitoring those control channels indicated by said central processing center.
Claim 2
Independent Claim
105 words
A method for monitoring system accesses to a radiocommunication system using an adjunct receiver comprising the steps of: listening, by said adjunct receiver, to channel frequencies associated with said system; evaluating, for channel frequencies on which transmissions are received by said adjunct receiver, whether said channel is a control channel or a traffic channel; sending, to a central processing center, an identification of control channels which said adjunct receiver is able to monitor; receiving, from said central processing center, an indication of which of said identified control channels said adjunct receiver is to monitor; and monitoring those control channels indicated by said central processing center.
Claim 3
Dependent Claim
14 words
The method of claim 1 , wherein said channel frequencies are downlink channel frequencies.
Claim 4
Dependent Claim
14 words
The method of claim 1 , wherein said channel frequencies are uplink channel frequencies.
Claim 5
Dependent Claim
27 words
The method of claim 1 , wherein said step of monitoring further comprises the step of: monitoring said control channels for emergency access by a remote station.
Claim 6
Dependent Claim
57 words
The method of claim 1 , wherein the step of monitoring further comprises the steps of: synchronizing to a downlink control channel to reduce time arrival uncertainty of uplink bursts; decoding detectable uplink bursts; grouping the decoded bursts into subchannels; collecting bursts from subchannels by user identification; and analyzing information in bursts associated with each user identification.
Claim 7
Dependent Claim
77 words
The method of claim 1 , further comprising the steps of: receiving, at each of a plurality of adjunct receivers, an emergency call transmitted by a remote unit; sending, by each of said plurality of adjunct receivers, a copy of said emergency call received thereby to the central processing center; processing said plural copies of said emergency call in combination to obtain a speech signal associated therewith; and forwarding said speech signal to an emergency service center.
Claim 8
Independent Claim
57 words
A method for monitoring system accesses to a radiocommunication system using a plurality of adjunct receivers comprising the steps of: monitoring, by said plurality of adjunct receivers, a group of control channels used by said radiocommunication system; and broadcasting, over a communication infrastructure linking said plurality of adjunct receivers, information received on said group of control channels.
Claim 9
Independent Claim
57 words
A method for monitoring system accesses to a radiocommunication system using a plurality of adjunct receivers comprising the steps of: monitoring, by said plurality of adjunct receivers, a group of control channels used by said radiocommunication system; and broadcasting, over a communication infrastructure linking said plurality of adjunct receivers, information received on said group of control channels.
Claim 10
Independent Claim
51 words
A method for scanning radiocommunication signals comprising the steps of: synchronizing to a downlink control channel to reduce time arrival uncertainty of uplink bursts; decoding detectable uplink bursts; grouping the decoded bursts into subchannels; collecting bursts from subchannels by user identification; and analyzing information in bursts associated with each user identification.
Claim 11
Independent Claim
51 words
A method for scanning radiocommunication signals comprising the steps of: synchronizing to a downlink control channel to reduce time arrival uncertainty of uplink bursts; decoding detectable uplink bursts; grouping the decoded bursts into subchannels; collecting bursts from subchannels by user identification; and analyzing information in bursts associated with each user identification.
Claim 12
Dependent Claim
28 words
The method of claim 8 , wherein said step of analyzing further comprises the step of: determining if an access associated with said bursts is an emergency access.
Claim 13
Independent Claim
80 words
A method for handling emergency calls in a radiocommunication system comprising the steps of: receiving, at each of a plurality of adjunct receivers, an emergency call transmitted by a remote unit; sending, by each of said plurality of adjunct receivers, a copy of said emergency call received thereby to a central processing center; processing said plural copies of said emergency call in combination to obtain a speech signal associated therewith; and forwarding said speech signal to an emergency service center.
Claim 14
Independent Claim
80 words
A method for handling emergency calls in a radiocommunication system comprising the steps of: receiving, at each of a plurality of adjunct receivers, an emergency call transmitted by a remote unit; sending, by each of said plurality of adjunct receivers, a copy of said emergency call received thereby to a central processing center; processing said plural copies of said emergency call in combination to obtain a speech signal associated therewith; and forwarding said speech signal to an emergency service center.
Claim 15
Dependent Claim
28 words
The method of claim 8 , wherein said step of processing further comprises the steps of: selecting a strongest received copy for use in obtaining said speech signal.
Claim 16
Dependent Claim
35 words
The method of claim 10 , wherein said step of processing further comprises the steps of: combining said plural copies using one of maximal ratio combining and equal gain combining to obtain said speech signal.
Claim 17
Independent Claim
76 words
A method for monitoring system accesses to a radiocommunication system comprising the steps of: listening to channel frequencies associated with the radiocommunication system; evaluating the channel frequencies to determine whether each of the channel frequencies is a control channel or a traffic channel; reporting an identification of channel frequencies which are determined to be control channels; receiving an indication of which of the identified control channels are to be monitored; and monitoring the indicated control channels.
Claim 18
Independent Claim
76 words
A method for monitoring system accesses to a radiocommunication system comprising the steps of: listening to channel frequencies associated with the radiocommunication system; evaluating the channel frequencies to determine whether each of the channel frequencies is a control channel or a traffic channel; reporting an identification of channel frequencies which are determined to be control channels; receiving an indication of which of the identified control channels are to be monitored; and monitoring the indicated control channels.
Claim 19
Dependent Claim
14 words
The method of claim 13 , wherein the channel frequencies are downlink channel frequencies.
Claim 20
Dependent Claim
14 words
The method of claim 13 , wherein the channel frequencies are uplink channel frequencies.
Claim 21
Dependent Claim
27 words
The method of claim 13 , wherein the step of monitoring further comprises the step of: monitoring the control channels for emergency access by a remote station.
Claim 22
Dependent Claim
39 words
The method of claim 16 , wherein the step of monitoring the control channels for emergency access by a remote station further comprises the step of: identifying an emergency access based upon a number dialed by the remote unit.
Claim 23
Dependent Claim
38 words
The method of claim 16 , wherein the step of monitoring the control channels for emergency access by a remote station further comprises the step of: identifying an emergency access based upon an indicator in the control channels.
Claim 24
Dependent Claim
22 words
The method of claim 13 , wherein the steps of listening, evaluating, reporting, receiving and monitoring are performed by an adjunct receiver.
Claim 25
Dependent Claim
40 words
The method of claim 13 , where in a processing center receives the identification of the channel frequencies which are determined to be control channels and sends an indication of which of the identified control channels are to be monitored.
Claim 26
Independent Claim
41 words
A method for monitoring system accesses to a radio communication system comprising the steps of: monitoring, at a plurality of locations, a group of control channels used by the radiocommunication system; and broadcasting information received on the group of control channels.
Claim 27
Independent Claim
41 words
A method for monitoring system accesses to a radio communication system comprising the steps of: monitoring, at a plurality of locations, a group of control channels used by the radiocommunication system; and broadcasting information received on the group of control channels.
Claim 28
Independent Claim
75 words
A method for handling emergency calls in a radiocommunication system comprising the steps of: receiving, at a plurality of locations, an emergency call transmitted by a remote unit; sending, from each of the plurality of locations, a copy of the emergency call received thereby to a processing center; processing the plural copies of the emergency call in combination to obtain a speech signal associated therewith; and forwarding the speech signal to an emergency service center.
Claim 29
Independent Claim
75 words
A method for handling emergency calls in a radiocommunication system comprising the steps of: receiving, at a plurality of locations, an emergency call transmitted by a remote unit; sending, from each of the plurality of locations, a copy of the emergency call received thereby to a processing center; processing the plural copies of the emergency call in combination to obtain a speech signal associated therewith; and forwarding the speech signal to an emergency service center.
Claim 30
Dependent Claim
28 words
The method of claim 22 , wherein the step of processing further comprises the step of: selecting a strongest received copy for use in obtaining said speech signal.
Claim 31
Dependent Claim
35 words
The method of claim 22 , wherein the step of processing further comprises the step of: combining the plural copies using one of maximal ratio combining and equal gain combining to obtain said speech signal.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2005-04-15 | 2005-10-15 | 2006-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-15 | 2009-10-15 | 2010-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-15 | 2013-10-15 | 2014-04-16 | $7700.00 | Window Closed / Lapsed |