| 摘要 |
Methods, systems, User Equipment (UE), and computer readable medium for reducing the occurrence of UE registration expiry are provided. A method of reducing the occurrence of UE registration expiry during calls includes registering a UE with a network for a registration period, determining a re-registration threshold time period, comparing a duration of a remaining portion of the registration period at a particular time with the re-registration threshold time period, and attempting to re-register the UE with the network for a further registration period if the remaining portion is less than or equal to the re-registration threshold time period, wherein the determining of the re-registration threshold time period includes at least one of setting the threshold time period to a value greater than 600 seconds, determining the threshold time period according to a remaining talk time of the UE at the particular time, determining the threshold time period according to a state of the UE at the particular time, determining the threshold time period according to a duration of at least one previous call made by the UE, determining the threshold time period according to a statistical parameter of a plurality of calls made by the UE, determining the threshold time period according to a statistical parameter of a plurality of calls made by at least one UE, determining the threshold time period according to a predefined maximum call duration, and determining the threshold time period independently of a length of the registration period.
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