Wireless network system selection mechanism within a mobile station
First Claim
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1. A multi-mode mobile station comprising:
- a radio frequency (RF) module capable of accessing a first radio system using a preferred radio protocol and further capable of accessing a second radio system using a less-preferred radio protocol; and
processing circuitry associated with said RF module capable of determining the quality of first control channel signals received from said first radio system and determining the quality of second control channel signals received from said second radio system, wherein said processing circuitry determines the quality of said first control channel signals by determining a number of control messages received during a predetermined time period in a first control channel in which said first control channel signals are transmitted and further determining if said number of received control messages exceeds a minimum threshold value, and said processing circuitry, in response to a determination that the quality of said first control channel signals is sufficient to prevent said multi-mode mobile station from losing access to said first radio system, further determines from the quality of said first control channel signals whether said first radio system is able to provide an optimum signal quality.
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Abstract
A multi-mode mobile station independently determines the radio signal quality of a serving mobile system by evaluating the error rate associated with the received forward-link-channel messages. In response to a determination that the calculated error rate is greater than an acceptable threshold level, the mobile station then attempts to access an alternative service system capable of providing better and more reliable telecommunications service.
84 Citations
18 Claims
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1. A multi-mode mobile station comprising:
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a radio frequency (RF) module capable of accessing a first radio system using a preferred radio protocol and further capable of accessing a second radio system using a less-preferred radio protocol; and
processing circuitry associated with said RF module capable of determining the quality of first control channel signals received from said first radio system and determining the quality of second control channel signals received from said second radio system, wherein said processing circuitry determines the quality of said first control channel signals by determining a number of control messages received during a predetermined time period in a first control channel in which said first control channel signals are transmitted and further determining if said number of received control messages exceeds a minimum threshold value, and said processing circuitry, in response to a determination that the quality of said first control channel signals is sufficient to prevent said multi-mode mobile station from losing access to said first radio system, further determines from the quality of said first control channel signals whether said first radio system is able to provide an optimum signal quality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating a multi-mode mobile station capable of accessing a first radio system using a preferred radio protocol and capable of accessing a second radio system using a less-preferred radio protocol, the method comprising the steps of:
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determining the quality of first control channel signals received from the first radio system by determining a number of control messages received during a predetermined time period in a first control channel in which the first control channel signals are transmitted and determining if the number of received control messages exceeds a minimum threshold value;
determining the quality of second control channel signals received from the second radio system; and
in response to a determination that the quality of the first control channel signals is sufficient to prevent the multi-mode mobile station from losing access to the first radio system, determining from the quality of the first control channel signals whether the first radio system is able to provide an optimum signal quality. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification