System and method for improving channel monitoring in a cellular system
First Claim
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1. A method of channel selection for a mobile station comprising:
- determining a position of said mobile station;
periodically performing channel quality measurements of signals transmitted from one or more base stations, wherein the frequency of performing said channel quality measurements is based on said position of said mobile station independent of the speed of said mobile station; and
wherein said frequency of performing said channel quality measurements is a function of the relative position of said mobile station with respect to a first base station serving said mobile station and at least one additional base station.
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Abstract
The present invention relates to a mobile station capable of determining its current location within a wireless communication system. The mobile station periodically generates an estimate of its current location or mobility and then monitors channels for channel selection based thereon in order to minimize frame stealing while in active mode and save energy during idle mode. The same information is also useful for determining which cells to monitor and controlling how frequently position or changes of position estimates are made. Although the invention requires a determination of the mobile station'"'"'s position or mobility, the manner in which the mobile station determines these characteristics may vary. A separate positioning receiver, terrestrial or satellite based, such as that used with the Global Positioning System, may allow the mobile station to calculate its position. Alternatively, the mobile station may monitor signals provided during communications with the base stations to calculate a relative position. In yet another embodiment, the base stations and associated cellular systems may cooperate to determine a particular mobile station'"'"'s position and then download the position to the mobile station.
102 Citations
21 Claims
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1. A method of channel selection for a mobile station comprising:
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determining a position of said mobile station; periodically performing channel quality measurements of signals transmitted from one or more base stations, wherein the frequency of performing said channel quality measurements is based on said position of said mobile station independent of the speed of said mobile station; and wherein said frequency of performing said channel quality measurements is a function of the relative position of said mobile station with respect to a first base station serving said mobile station and at least one additional base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of channel selection for a mobile station comprising:
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determining a position of said mobile station; periodically performing channel quality measurements of signals transmitted from one or more base stations, wherein the frequency of performing said channel quality measurements is a function of said position of said mobile station; and wherein said frequency of performing said channel quality measurements is a function of the length of time said mobile station remains in said position. - View Dependent Claims (10, 11)
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12. A method of determining the position of a mobile station comprising:
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determining a position of said mobile station at a first time instant; updating said position periodically, wherein a frequency of said updating is a function of said position of said mobile station; wherein said frequency of updating said position is a function of the mobility of said mobile station; and wherein said frequency of updating said position is a function of the rate of change of said position of said mobile station.
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13. A method of determining the position of a mobile station comprising:
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determining a position of said mobile station at a first time instant; updating said position periodically, wherein a frequency of said updating is a function of said position of said mobile station; wherein said frequency of updating said position is a function of the mobility of said mobile station; and wherein said frequency of updating said position is a function of the length of time said mobile station remains in said position.
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14. A mobile station comprising:
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a transceiver to transmit and receive radio frequency signals; a signal processor operatively connected to said transceiver to periodically perform channel quality measurements on selected signals received by said transceiver; control logic to control said signal processor and said transceiver to vary the frequency of performing said channel quality measurements based on the position of said mobile station independent of the speed of said mobile station; and wherein said control logic varies the frequency of performing said channel quality measurements based on the relative position of said mobile station with respect to a first base station serving said mobile station and at least one additional base station. - View Dependent Claims (15)
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16. A mobile station comprising:
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a transceiver to transmit and receive radio frequency signals; a signal processor operatively connected to said transceiver to periodically perform channel quality measurements on selected signals received by said transceiver; control logic to control said signal processor and said transceiver to vary the frequency of performing said channel quality measurements as a function of the position of said mobile station; and wherein said control logic varies the frequency of performing said channel quality measurements based on the length of time said mobile station remains in said position. - View Dependent Claims (17)
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18. A mobile station comprising:
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a transceiver transmitting and receiving radio frequency signals; a positioning receiver periodically determining a position of said mobile station; control logic controlling said transceiver and said positioning receiver, wherein said control logic varies the frequency of determining said position of said mobile station as a function of said position; and wherein said control logic varies the frequency of determining said position of said mobile station based on the length of time said mobile station remains in said position.
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19. A method of controlling a mobile station comprising:
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determining a position of said mobile station; performing a periodic task, wherein the frequency of performing said task is based on said position of said mobile station independent of the speed of said mobile station; and wherein said frequency of performing said periodic task is a function of the relative position of said mobile station with respect to a first base station serving said mobile station and at least one additional base station.
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20. A method of controlling a mobile station comprising:
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determining a position of said mobile station; performing a periodic task, wherein the frequency of performing said task is a function of said position of said mobile station; and wherein said frequency of performing said periodic task is a function of the length of time said mobile station remains in said position. - View Dependent Claims (21)
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Specification
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Current AssigneeOptis Wireless Technology, LLC (Brevet Capital)
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Original AssigneeEricsson, Inc. (Telefonaktiebolaget LM Ericsson)
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InventorsRaith, Alex Krister
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Primary Examiner(s)BEAMER, TEMICA M
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Application NumberUS09/498,772Time in Patent Office2,124 DaysField of Search455/422, 455/450, 455/452, 455/436, 455/438, 455/456, 455/435, 455/406, 455/433, 455/453, 455/509, 455/513, 455/525, 455/67.1, 455/67.3, 455/62, 455/63, 455/574, 455/343, 455/464, 455/434, 370/311US Class Current455/440CPC Class CodesH04L 1/20 using signal quality detectorH04W 24/10 Scheduling measurement repo...H04W 36/00835 Determination of neighbour ...H04W 36/0085 Hand-off measurementsH04W 36/30 by measured or perceived co...H04W 40/248 Connectivity information up...H04W 64/00 Locating users or terminals...H04W 72/02 Selection of wireless resou...H04W 72/54 based on quality criteriaH04W 72/542 using measured or perceived...Y02D 30/70 in wireless communication n...
