Method and apparatus for performing signaling for reserved sub-band in wireless communication system
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 with a second STA in a wireless local area network (WLAN), the method comprising:
receiving, by the first STA from the second STA, resource allocation information for a plurality of STAs, including the first STA, wherein the first STA communicates with the second STA using orthogonal frequency divisional multiple access (OFDMA) or multi-user multiple input multiple output (MU-MIMO); and
receiving, by the first STA from the second STA, data through a frequency band based on the resource allocation information,
wherein the frequency band includes a plurality of resource units, the plurality of resource units including a normal resource unit allocated to one STA, and a multi-user resource unit which is a single resource unit allocated to more than one STA among the plurality of STAs,
wherein the resource allocation information includes:
a common resource allocation information having a same value for the plurality of STAs, and informing a number of the plurality of resource units and each size of the plurality of resource units,
a multi-user indication for a number of STAs, among the plurality of STAs, to which the multi-user resource unit is allocated, and
multiple ID fields for corresponding identification information of STA to which the normal resource unit or the multi-user resource unit is allocated.
2. The method of claim 1 , wherein the ID fields include:
one or more first ID fields informing corresponding identification information of one or more STAs respectively allocated to the normal resource units, and
one or more second ID fields informing corresponding identification information of one or more STAs allocated to the multi-user resource unit.
3. The method of claim 1 , wherein the plurality of resource units further includes a null subband which is not used to receive the data.
4. The method of claim 3 , wherein the ID fields further include one or more third ID fields informing the null subband by using a specific value of the ID field.
5. The method of claim 4 , wherein the specific value is a value other than values representing identifiers of the plurality of STAs.
6. A first station (STA) for communicating with a second STA in a wireless local area network (WLAN), the first STA comprising:
transceiver configured to receive resource allocation information for a plurality of STAs, including the first STA, wherein the first STA communicates with the second STA using orthogonal frequency divisional multiple access (OFDMA) or multi-user multiple input multiple output (MU-MIMO), and to receive data through a frequency band based on the resource allocation information from the second STA; and
a processor connected to the transceiver and configured to process the resource allocation information and the data,
wherein the frequency band includes a plurality of resource units, the plurality of resource units including a normal resource unit allocated to one STA, and a multi-user resource unit which is a single resource unit allocated to more than one STA among the plurality of STAs,
wherein the resource allocation information includes:
a common resource allocation information having a same value for the plurality of STAs, and informing a number of the plurality of resource units and each size of the plurality of resource units based on,
a multi-user indication for a number of STAs, among the plurality of STAs, to which the multi-user resource unit is allocated, and
multiple ID fields for corresponding identification information of STA to which the normal resource unit or the multi-user resource unit is allocated.
7. The first STA of claim 6 , wherein the ID fields include:
one or more first ID fields informing corresponding identification information of one or more STAs respectively allocated to the normal resource units, and
one or more second ID fields informing corresponding identification information of one or more STAs allocated to the multi-user resource unit.
8. The first STA of claim 6 , wherein the plurality of resource units further includes a null subband which is not used to receive the data.
9. The first STA of claim 8 , wherein the ID fields further include one or more third ID fields informing the null subband by using a specific value of the ID field.
10. The first STA of claim 9 , wherein the specific value is a value other than values representing identifiers of the plurality of STAs.