Method and apparatus for performing signaling for reserved sub-band in wireless communication system
The present document relates to a wireless communication system and, more particularly, to a method for performing efficient signaling for a reserved sub-band in a wireless LAN system, and a method and an apparatus for signal transmission using the same. To this end, an STA provides resource allocation information for transmitting data to a plurality of STAs using an orthogonal frequency divisional multiple access (OFDMA) or multiple user MIMO (MU-MIMO) method; transmits the resource allocation information to the plurality of STAs; and transmits data to the plurality of STAs according to the resource allocation information. The entire frequency band may include a sub-band which is not used for the data transmission, and it is preferable that the resource allocation information includes a resource allocation bitmap having a form common to the plurality of STAs and indication information which informs a sub-band, from among the entire frequency band, which is not used for the data transmission.
1. A method for a first station (STA) to communicate signals with a plurality of STAs in a wireless local area network (WLAN), the method comprising:
preparing, at the first STA, resource allocation information for data to be transmitted to or received from the plurality of STAs; and
transmitting, by the first STA, the resource allocation information to the plurality of STAs,
wherein the data is transmitted to or received from the plurality of STAs through a frequency band based on the resource allocation information,
wherein the frequency band includes a null subband which is not used to transmit or receive the data by the plurality of STAs,
wherein the resource allocation information includes a common resource allocation bitmap having a same value for the plurality of STAs,
wherein the common resource allocation bitmap informs the plurality of STAs of various sizes of each of subbands,
wherein each of the subbands is a unit to be allocated to the plurality of STAs or to be allocated as the null subband, and
wherein the resource allocation information further includes ID fields, separate from the common resource allocation bitmap, the ID fields including:
a first ID field informing identification information of a STA among the plurality of STAs, and
a second ID field informing the null subband by using a specific value of the ID field.
2. The method according to claim 1 , wherein the resource allocation information further includes information related to order of allocating the subbands within the frequency band to the plurality of STAs.
3. The method according to claim 1 , wherein the specific value is a value other than values representing identifiers of the plurality of STAs.
4. The method according to claim 3 , wherein the specific value of the ID field on a first subband, among a plurality of subbands within the frequency band, indicates that the first subband is the null subband.
5. The method according to claim 4 , wherein the ID field on a second subband, different from the first subband, having a value corresponding to an identifier of a first STA among the plurality of STAs indicates that the second subband is not the null subband and the other subband is allocated to the first STA.
6. The method according to claim 1 , wherein the first station is an AP (Access Point).
7. The method according to claim 6 , wherein the AP transmits the resource allocation information to the plurality of STAs to solicit transmission of the data from the plurality of STAs.
8. The method according to claim 6 , wherein the AP transmits the resource allocation information to the plurality of STAs to transmit the data to the plurality of STAs.
9. A station (STA) for communicating signals with a plurality of STAs in a wireless local area network (WLAN), the STA comprising:
a processor configured to prepare resource allocation information for data to be transmitted to or received from the plurality of STAs; and
a transceiver connected to the processor and configured to transmit the resource allocation information to the plurality of STAs,
wherein the data is transmitted to or received from the plurality of STAs through a frequency band based on the resource allocation information,
wherein the frequency band includes a null subband which is not used to transmit or receive the data by the plurality of STAs,
wherein the processor configures the resource allocation information such that the resource allocation information includes a common resource allocation bitmap having a same value for the plurality of STAs, and ID fields,
wherein the common resource allocation bitmap informs the plurality of STAs of various sizes of each of subbands,
wherein each of the subbands is a unit to be allocated to the plurality of STAs or to be allocated as the null subband, and
wherein the resource allocation information further includes ID fields, separate from the common resource allocation bitmap, the ID fields including:
a first ID field informing identification information of a STA among the plurality of STAs, and
a second ID field informing the null subband by using a specific value of the ID field.
10. The STA according to claim 9 , wherein the specific value of the ID field on a first subband, among a plurality of subbands within the frequency band, indicates that the first subband is the null subband.