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 receive a frame configured for multi-user (MU) operation in a wireless local area network (WLAN), the method comprising:
receiving a single resource allocation bitmap of the frame from an access point (AP),
wherein the single resource allocation bitmap is common for multiple STAs for the MU operation including the first STA;
based on the single resource allocation bitmap, determining (a) sizes of each of the plural resource units, (b) locations of each of the plural resource units and (c) and a number of each of the plural resource units,
wherein each of the plural resource units is a unit to be allocated to a specific user or a unit to be allocated as a null subband;
receiving a user identification field of the frame from the AP,
wherein the user identification field is specific for each of the multiple STAs,
wherein the user identification field includes one or more first user identification values for identification of the multi-users one or more second user identification values for identification of the null subband, and
wherein a total number of the first user identification values and the second user identification values is based on the number of each of the plural resource units;
determining which one of the plural resource units is allocated to the first STA based on one of the first user identification values corresponding to the first STA,
wherein the allocated resource unit has a corresponding size and location determined based on the single resource allocation bitmap; and
receiving data of the frame based on the determined resource unit.
2. The method of claim 1 , wherein the null subband has corresponding size determined based on the single resource allocation bitmap.
3. The method of claim 1 , wherein the frame is received based on OFDMA (Orthogonal Frequency Divisional Multiple Access) scheme or MU-MIMO (Multi-User Multiple Input Multiple Output) scheme.
4. A first station (STA) configured to receive a frame for multi-user (MU) operation in a wireless local area network (WLAN), the STA comprising:
a transceiver configured to receive the frame including a single resource allocation bitmap, a user identification field and data from an access point (AP),
wherein the single resource allocation bitmap is common for multiple STAs for the MU operation including the first STA, and
wherein the user identification field is specific for each of the multiple STAs,
wherein the user identification field includes one or more first user identification values for identification of the multi-users one or more second user identification values for identification of the null subband, and
wherein a total number of the first user identification values and the second user identification values is based on the number of each of plural resource units;
a processor connected to the transceiver and configured to:
based on the single resource allocation bitmap, determine (a) sizes of each of the plural resource units, (b) locations of each of the plural resource units and (c) a number of each of the plural resource units,
wherein each of the plural resource units is a unit to be allocated to a specific user or a unit to be allocated as a null subband;
determine which one of the plural resource units is allocated to the first STA based on one of the first user identification values corresponding to the first STA,
wherein the allocated resource unit has a corresponding size and location determined based on the single resource allocation bitmap; and
control the transceiver to receive the data of the frame based on the determined resource unit.
5. The first STA of claim 4 , wherein the null subband has corresponding size determined based on the single resource allocation bitmap.
6. The first STA of claim 4 , wherein the frame is received based on OFDMA (Orthogonal Frequency Divisional Multiple Access) scheme or MU-MIMO (Multi-User Multiple Input Multiple Output) scheme.