Patent ID: 8547926

Claim:
A method for receiving system information elements, in a wireless access system, the method comprising: receiving, by a mobile station (MS), a super frame header (SFH) including a fixed-size system information element (IE) and configuration information (CI) related to a variable-size system information element (IE), wherein the CI includes an information type field indicating a type of the variable size system IE; and receiving, by the MS, an advanced-MAP (A-MAP) based on the CI, the A-MAP including the variable-size system information element (IE), wherein the SFH is transmitted at a start of each superframe and the A-MAP is transmitted at a start of a downlink (DL) subframe included in a frame which is one of four frames included in the superframe, the fixed-size system information element (IE) comprises at least one of a primary information element (IE) required for initial network entry of the MS, frame configuration information, frame control information, and downlink to uplink ratio (DL/UL ratio) information indicating a ratio of DL subframes and UL subframes which are included in each of the four frames, the variable-size system information element (IE) has one or more types, and information comprised in the variable-size system information element (IE) is variable according to the type indicated by the information type field, and the variable-size system information element (IE) further comprises changed DL/UL ratio information if the DL/UL ratio information is changed at the frame where the A-MAP is received.