Method and apparatus for increasing a probability that a dual-band mobile station will acquire a desired autonomous system
First Claim
1. A method for operating a mobile station, comprising steps of:
- (a) storing information in a memory of the mobile station, the stored information comprising an ordered list of frequency bands, each frequency band comprising at least one channel, the stored information further comprising an identity of a band wherein an acceptable control channel was last located;
(b) in response to a user invoking a search procedure to locate a new non-public system, accessing the memory to determine the identity of the band wherein an acceptable control channel was last located, and marking the band wherein the acceptable control channel was last located as a band to be searched;
(c) collecting signal strength measurements on channels in the band to be searched and executing a channel search procedure to locate a control channel of a desired non-public system within the band to be searched;
(d) if a desired non-public system is not located in the band to be searched, accessing the memory to obtain a next band to be searched from the ordered list of frequency bands and marking the next band as the band to be searched; and
repeating steps (c) and (d) until either the ordered list of frequency bands is exhausted or a desired non-public system is located.
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Abstract
A method for operating a dual-band mobile station (10) includes a first step of (a) storing information in the mobile station. The stored information includes an ordered list of frequency bands (Band Order Table 24A). For example, at least one frequency band is an 800 MHz frequency band and at least one other frequency band is a 1900 MHz frequency band. The stored information further includes an identity (24B) of a band wherein an acceptable control channel was last located. A next step (b) is executed in response to a user invoking a search procedure to locate a new non-public system. This step accesses the memory to determine the identity of the band wherein an acceptable control channel was last located, and marks this band as a band to be searched. A next step (c) collects signal strength measurements on channels in the band to be searched and executes a channel search procedure to locate a control channel of a desired non-public system within the band to be searched. If a desired non-public system is not located in the band to be searched, a next step (d) accesses the memory to obtain a next band to be searched from the Band Order Table. The method repeats steps (c) and (d) until either the ordered list of frequency bands is exhausted or a desired non-public system is located, thereby enabling a non-public system to be located in a band other than the current band of the mobile station.
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Citations
20 Claims
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1. A method for operating a mobile station, comprising steps of:
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(a) storing information in a memory of the mobile station, the stored information comprising an ordered list of frequency bands, each frequency band comprising at least one channel, the stored information further comprising an identity of a band wherein an acceptable control channel was last located;
(b) in response to a user invoking a search procedure to locate a new non-public system, accessing the memory to determine the identity of the band wherein an acceptable control channel was last located, and marking the band wherein the acceptable control channel was last located as a band to be searched;
(c) collecting signal strength measurements on channels in the band to be searched and executing a channel search procedure to locate a control channel of a desired non-public system within the band to be searched;
(d) if a desired non-public system is not located in the band to be searched, accessing the memory to obtain a next band to be searched from the ordered list of frequency bands and marking the next band as the band to be searched; and
repeating steps (c) and (d) until either the ordered list of frequency bands is exhausted or a desired non-public system is located. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile station, comprising:
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a RF transceiver for bidirectionally communicating with base stations of public or autonomous communications systems;
a user interface for displaying information to a user and for receiving an input from a user;
a memory for storing information, the stored information comprising an ordered list of frequency bands, each frequency band comprising at least one channel, the stored information further comprising an identity of a band wherein an acceptable control channel was last located; and
a controller coupled to said transceiver, to said user interface, and to said memory, said controller being responsive to a user invoking a search procedure to locate a new non-public system for accessing said memory to determine the identity of the band wherein an acceptable control channel was last located, and for marking the band wherein the acceptable control channel was last located as a band to be searched, said controller tuning said transceiver for collecting signal strength measurements on channels in the band to be searched and executing a channel search procedure to locate a control channel of a desired non-public system within the band to be searched, said controller being responsive to a condition that a desired non-public system is not located in the band to be searched, for accessing said memory to obtain a next band to be searched from said ordered list of frequency bands and for marking the next band in said ordered list as the band to be searched, said controller continuing to collect signal strength measurements and executing the search procedure until either the ordered list of frequency bands is exhausted or a desired non-public system is located. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for operating a mobile station, comprising steps of:
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(a) storing information in a memory of the mobile station, the stored information comprising a list having one or more entries, each entry corresponding to a frequency band comprising at least one channel, the stored information further comprising an identity of a frequency band wherein an acceptable digital control channel (DCCH) was last located;
(b) in response to a search procedure being invoked to locate a desired one of a Residential system or a Private system, accessing the memory to determine the identity of the frequency band wherein the acceptable DCCH was last located, and marking the band as a band to be searched, else if the identity of the band wherein the acceptable DCCH was last located is not available, then selecting a predetermined entry in the list of frequency bands and marking the corresponding frequency band as the band to be searched;
(c) collecting signal strength measurements on channels in the band to be searched and executing a channel search procedure to locate a control channel of a desired Residential system or Private system within the band to be searched;
(d) if a desired Residential system or Private system is not located in the band to be searched, accessing the memory to obtain a next entry from the list of frequency bands and marking the corresponding band as the band to be searched; and
repeating steps (c) and (d) until either the list of frequency bands is exhausted or the desired Residential system or Private system is located. - View Dependent Claims (18, 19, 20)
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Specification