| 摘要 |
The present invention discloses a method for providing presence information, including: setting a validity period of the presence information; publishing, by a presentity client, the received presence information and the validity period to a presence server; and distributing the received presence information and the validity period to a watcher client by the presence server. Thus, the watcher client knows the validity period of the presence information, such as an end time of a current presence time, and thereby selects timely an appropriate time for communication with the presentity client. Furthermore, the present invention also provides a start time of the current presence information, and thus the watcher client knows a duration of the current presence information of the presentity client. The present invention further discloses a system for providing presence information.
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