Method and apparatus for transmitting management information in wireless local area network system
A method of transmitting management information in wireless local area network system is provided, The method includes transmitting, to a station, a frame including a BSS load in-formation element, the BSS load element including a multi user(MU) multiple input multiple output(MIMO) capable STA count field and a spatial stream utility field, wherein the MUMIMO capable STA count field indicates the total number of STAs with MU reception capability currently associated with the candidate BSS and the Spatial Stream Utility field indicates under utilized spatial streams for busy time of wireless medium.
1. A method of an access point (AP) selection, performed by a station (STA), in wireless local area network system, the method comprising:
receiving, from an AP, a frame including basic service set (BSS) load information, the BSS load including a multi user-multiple input multiple output (MU-MIMO) capable STA count field and a spatial stream utility field; and
determining whether the STA tries to access the AP based on the BSS load information,
wherein the MU-MIMO capable STA count field indicates a total number of MU-capable STAs that are currently associated with a BSS of the AP and have capabilities of MU-MIMO reception,
wherein the spatial stream utility field indicates a spatial stream underutilization that is defined as a percentage of time that the AP has one or more underutilized spatial domain resources for a given busy time of a wireless medium, and
wherein the spatial stream underutilization is calculated based on a maximum number of supported spatial streams supported by the AP and a number of one or more utilized spatial streams transmitted by the AP to one or more MU-capable STAs.
2. The method of claim 1 , further comprising:
transmitting a probe request frame for scanning candidate BSSs,
wherein the frame is a probe response frame received in response to the probe request frame.
3. The method of claim 1 , wherein the percentage is linearly scaled with 255.
4. The method of claim 1 , wherein the frame includes a beacon frame.
5. A method of transmitting management information, performed by an access point (AP), in wireless local area network system, the method comprising:
transmitting, to a station (STA), a frame including basic service set (BSS) load information, the BSS load information including a multi user-multiple input multiple output (MU-MIMO) capable STA count field and a spatial stream utility field,
wherein the MU-MIMO capable STA count field indicates a total number of MU-capable STAs that are currently associated with a BSS of the AP and have capabilities of MU-MIMO reception,
wherein the spatial stream utility field indicates a spatial stream underutilization that is defined as a percentage of time that the AP has one or more underutilized spatial domain resources for a given busy time of a wireless medium, and
wherein the spatial stream underutilization is calculated based on a maximum number of supported spatial streams supported by the AP and a number of one or more utilized spatial streams transmitted by the AP to one or more MU-capable STAs.
6. The method of claim 5 , the method further comprising:
receiving, from the station, a probe request frame for scanning candidate BSSs, wherein the frame is a probe response frame transmitted in response to the probe request frame.
7. The method of claim 5 , wherein the percentage is linearly scaled with 255.
8. The method of claim 6 , further comprising:
performing a carrier sense mechanism for determining a state of the wireless medium used to configure the spatial stream utility field.
9. The method of claim 5 , wherein the frame includes a beacon frame.
10. An access point (AP) in wireless local area network system, the AP comprising:
a transceiver configured to transmit radio signals; and
a processor operatively coupled with the transceiver and configured to instruct the transceiver to transmit, to a station (STA), a frame including basic service set (BSS) load information, the BSS load information including a multi user-multiple input multiple output (MU-MIMO) capable STA count field and a spatial stream utility field,
wherein the MU-MIMO capable STA count field indicates a total number of MU-capable STAs that are currently associated with a BSS of the AP and have capabilities of MU-MIMO reception,
wherein the spatial stream utility field indicates a spatial stream underutilization that is defined as a percentage of time that the AP has one or more underutilized spatial domain resources for a given busy time of a wireless medium, and
wherein the spatial stream underutilization is calculated based on a maximum number of supported spatial streams supported by the AP and a number of one or more utilized spatial streams transmitted by the AP to one or more MU-capable STAs.