Systems and methods for maintaining time stamping accuracy to meet a non-linear time drift constraint
First Claim
1. A method of operation of a wireless device in a cellular communications network, comprising:
- logging, by the wireless device, data to provide a log; and
maintaining by the wireless device, an accuracy of time stamping for the log to meet a non-linear time drift constraint having a linear time drift constraint and a total maximum time drift over a defined amount of time, where the total maximum time drift over the defined amount of time is less than an amount of time drift in the time stamping that would result from the linear time drift constraint over the defined amount of time, wherein maintaining the accuracy of the time stamping for the log to meet the non-linear time drift constraint comprises;
switching between two or more clocks having different accuracies such that the non-linear time drift constraint is met;
providing the time stamping for the log with a first clock having a first accuracy; and
switching to a second clock having a second accuracy that is greater than the first accuracy when a logging time exceeds a threshold.
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Abstract
Systems and methods for maintaining time stamping accuracy are disclosed. In one embodiment, a wireless device in a cellular communications network logs data to provide a log. The wireless device maintains an accuracy of time stamping for the log to meet, or satisfy, a non-linear time drift constraint. In one embodiment, the log is one or more of a Radio Resource Control (RRC) connection establishment failure log, a radio link failure log, a random access failure log, a paging channel failure log, a broadcast channel failure log, data related to failure of one or more specific channels, and a radio measurement. In another embodiment, the log is a Minimization of Drive Tests (MDT) log.
26 Citations
24 Claims
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1. A method of operation of a wireless device in a cellular communications network, comprising:
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logging, by the wireless device, data to provide a log; and maintaining by the wireless device, an accuracy of time stamping for the log to meet a non-linear time drift constraint having a linear time drift constraint and a total maximum time drift over a defined amount of time, where the total maximum time drift over the defined amount of time is less than an amount of time drift in the time stamping that would result from the linear time drift constraint over the defined amount of time, wherein maintaining the accuracy of the time stamping for the log to meet the non-linear time drift constraint comprises; switching between two or more clocks having different accuracies such that the non-linear time drift constraint is met; providing the time stamping for the log with a first clock having a first accuracy; and switching to a second clock having a second accuracy that is greater than the first accuracy when a logging time exceeds a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A wireless device configured to operate in a cellular communications network, comprising:
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a radio subsystem; and a processing subsystem associated with the radio subsystem and configured to;
log data to provide a log; andmaintain an accuracy of time stamping for the log to meet a non-linear time drift constraint having a linear time drift constraint and a total maximum time drift over a defined amount of time, where the total maximum time drift over the defined amount of time is less than an amount of time drift in the time stamping that would result from the linear time drift constraint over the defined amount of time, wherein in order to maintain the accuracy of the time stamping for the log to meet the non-linear time drift constraint the processing subsystem is further configured to; switch between two or more clocks having different accuracies such that the non-linear time drift constraint is met; provide the time stamping for the log with a first clock having a first accuracy; and switch to a second clock having a second accuracy that is greater than the first accuracy when a logging time exceeds a threshold. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification