Method and apparatus for performing idle-mode operation using mobility information

A method for supporting an idle-mode operation of a Mobile Station (MS) to which one or more paging groups are allocated, the method comprising:

• receiving a deregistration request message requesting initiation of idle mode from the MS, wherein the deregistration request message includes mobility information indicating a mobility level of the MS, the mobility level representing a moving speed of the MS;
• and
• transmitting, to the MS, a deregistration command message including paging group information, wherein the paging group information includes a primary paging group Identifier (ID), and a primary paging offset of a primary paging group allocated to the MS, a secondary paging group ID, and a secondary paging offset of a secondary paging group allocated to the MS,
• wherein the primary paging group and the secondary paging group are set based on the mobility information, and
• wherein the mobility information indicates the mobility level as one of fast, medium, or slow.

A Mobile Station (MS) in idle mode, to which one or more paging groups are allocated, the MS comprising:

• a transmitter configured to transmit a message;
• a receiver configured to receive a message;
• and
• a processor configured to control an idle-mode operation of the MS;
• wherein the transmitter is configured to transmit a deregistration request message requesting initiation of idle mode to a first Base Station (BS), wherein the deregistration request message includes mobility information indicating a mobility level of the MS, the mobility level representing a moving speed of the MS,
• wherein the receiver is configured to receive a deregistration command message including paging group information from the first BS, wherein the paging group information includes a primary paging group Identifier (ID), a primary paging offset of a primary paging group allocated to the MS, a secondary paging group ID, and secondary paging offset of a secondary paging group allocated to the MS,
• wherein the processor causes activation of a paging group location update timer after moving from the primary paging group to the secondary paging group,
• wherein the primary paging group and the secondary paging group are set based on the mobility information, and
• wherein the mobility information indicates the mobility level as one of fast, medium, or slow.

A base station (BS) for supporting an idle-mode operation of a Mobile Station (MS) to which one or more paging groups are allocated, the BS comprising:

• a processor configured to control the idle-mode operation of the MS;
• a receiver configured to receive a deregistration request message requesting initiation of idle mode from the MS, wherein the deregistration request message includes mobility information indicating a mobility level of the MS, the mobility level representing a moving speed of the MS;
• and
• a transmitter configured to transmit to the MS a deregistration command message including paging group information, wherein the paging group information includes a primary paging group Identifier (ID), primary paging offset of a primary paging group allocated to the MS, a secondary paging group ID, and a secondary paging offset of a secondary paging group allocated to the MS,
• wherein the primary paging group and the secondary paging group are set based on the mobility information, and
• wherein the mobility information indicates the mobility level of the MS as one of fast, medium, or slow.