| 摘要 |
A method of checking status of a mobile station in sleep mode is provided. The method includes receiving a SLP-REQ message from the mobile station; transmitting a SLP-RSP message in response to the SLP-REQ message, the SLP-RSP message including a first periodic ranging time frame offset indicating when the mobile station transmits a ranging request message; receiving the ranging request message which the mobile station transmits during a time period indicated by the first periodic ranging frame offset; and transmitting a ranging response message in response to the ranging request message, the ranging response message including information required for performing a ranging process, wherein the ranging response message further includes a second periodic ranging time frame offset if the mobile station transmits the ranging request message additionally.
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