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1. (US20150098447) Method and device for selective decoding of beacon frame in wireless LAN system
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Claims

1. A method of receiving a frame by a station (STA) in a wireless communication system, the method comprising:
receiving, by the STA, a frame including a first data part and a second data part from an access point (AP);
wherein the frame further includes information used for determining, by the STA, whether to perform decoding of at least one of the first data part and the second data part,
determining, by the STA, whether to perform the decoding of at least one of the first data part and the second data part of the frame using the information included in the frame;
performing, by the STA, the decoding of at least one of the first data part and the second data part when it is determined that the decoding is to be performed,
wherein whether to perform the decoding is determined based on a change of at least one of the first data part and the second data part;
transmitting, by the STA, a power save-poll (PS-Poll) frame to the AP based on the decoded frame; and
receiving, by the STA, data from the AP based on the PS-Poll frame.
2. The method of claim 1, wherein whether to perform the decoding is determined using information included in an SIG (signal) field of the frame.
3. The method of claim 2, wherein the SIG field includes change count information.
4. The method of claim 2, wherein the SIG field includes at least one of change count information on the first data part and change count information on the second data part.
5. The method of claim 2, wherein if a value of change count information on the first data part is incremented, it is determined to perform the decoding on the first data part, and
wherein if a value of change count information on the second data part is incremented, it is determined to perform the decoding on the second data part.
6. The method of claim 2, wherein the SIG field includes at least one of:
information indicating a total length of the first data part and the second data part,
information indicating a total length of the first data part, and
information indicating a start offset of the second data part.
7. The method of claim 2, wherein the SIG field includes at least one of:
information indicating whether the frame is a beacon frame, and
information indicating whether a TIM (traffic indication map) information element is included in one of the first data part or the second data part.
8. The method of claim 1, wherein the first data part includes information indicating whether a TIM information element is included in the frame.
9. The method of claim 8, wherein if the information indicating whether the TIM information element is included indicates that the TIM information element is not included in the frame, it is determined not to decode the second data part.
10. The method of claim 1, wherein the first data part includes a MAC (medium access control) header, a first frame body and a first FCS (frame check sequence) field.
11. The method of claim 1, wherein the second data part includes a second frame body and a second FCS field.
12. The method of claim 1, wherein the frame comprises a PPDU (physical layer convergence protocol (PLCP) packet data unit) frame, wherein the frame further includes an STF (short training field) and an LTF (long training field), and
wherein the first data part and the second data part are included in an MPDU (MAC PDU) part of the PPDU frame.
13. A method of transmitting a frame by an access point (AP) in a wireless communication system, the method comprising:
transmitting, by the AP, a frame including a first data part and a second data part to a station (STA),
wherein the first data part and the second data part of the frame are encoded separately,
wherein the frame further includes information used for determining, by the STA, whether to perform decoding of at least one of the first data part and the second data part, and
wherein whether to perform the decoding is determined based on a change of at least one of the first data part and the second data part,
receiving, by the AP, a power save-poll (PS-Poll) frame from the STA based on a decoded frame; and
transmitting, by the AP, data to the STA based on the PS-Poll frame.
14. A station device for receiving a frame in a wireless communication system, the station device comprising:
a transceiver; and
a processor,
wherein the processor:
controls the transceiver to receive a frame including a first data part and a second data part from an access point (AP),
wherein the frame further includes information used for determining, by the STA, whether to perform decoding of at least one of the first data part and the second data part,
determines whether to perform the decoding of at least one of the first data part and the second data part of the frame using the information,
performs the decoding of at least one of the first data part and the second data part when it is determined that the decoding is to be performed,
wherein whether to perform the decoding is determined based on a change of at least one of the first data part and the second data part,
controls the transceiver to transmit a power save-poll (PS-Poll) frame to the AP based on the decoded frame using the transceiver, and
controls the transceiver to receive data from the AP based on the PS-Poll frame.
15. An access point (AP) device for transmitting a frame in a wireless communication system, the AP comprising:
a transceiver; and
a processor,
wherein the processor:
controls the transceiver to transmit a frame including a first data part and a second data part to a station (STA),
wherein the first data part and the second data part of the frame are encoded separately,
wherein the frame further includes information used for determining, by the STA, whether to perform decoding of at least one of the first data part and the second data part, and
wherein whether to perform the decoding is determined based on a change of at least one of the first data part and the second data part,
controls the transceiver to receive a power save-poll (PS-Poll) frame from the STA based on a decoded frame, and
controls the transceiver to transmit data to the STA based on the PS-Poll frame.