Clear channel assessment (CCA) threshold adaptation method
Methods and apparatuses are described herein for determining a transmit power based on clear channel assessment (CCA) thresholds. A station (STA) associated with a first Basic Service Set (BSS) may receive, from an access point (AP) associated with the first BSS, a clear channel assessment (CCA) value for a group of STAs associated with a second BSS. The CCA value may indicate a minimum CCA threshold for a packet received from the second BSS. The STA may then determine, based on the CCA value, a STA specific CCA parameter and a target CCA parameter. The target CCA parameter may be greater than or equal to the STA specific CCA parameter. Based on the STA specific CCA parameter and the target CCA parameter, the STA may determine a target transmit power control (TPC) parameter of the STA, wherein the sum of target TPC parameter and target CCA parameter is constant.
1. A method for use in an access point (AP) associated with a first Basic Service Set (BSS), the method comprising:
transmitting, to an IEEE 802.11 station (STA) associated with the first BSS, a Clear Channel Assessment (CCA) value for a group of STAs associated with a second BSS, the CCA value indicating a minimum CCA threshold for a packet received from the second BSS; and
receiving, from the IEEE 802.11 STA, a signal at a transmit power adjusted based on a target transmit power control (TPC) parameter of the IEEE 802.11 STA,
wherein the target TPC parameter is determined based on the CCA value, a STA specific CCA parameter and a target CCA parameter, the target CCA parameter being greater than the STA specific CCA parameter.
2. The method of claim 1 , wherein a sum of the target TPC parameter and the STA specific CCA parameter is constant.
3. The method of claim 1 , wherein the adjusted transmit power is less than or equal to a maximum transmit power of the IEEE 802.11 STA.
4. The method of claim 1 , wherein the STA specific CCA parameter indicates a CCA threshold for a packet received from the group of STAs associated with the second BSS.
5. The method of claim 1 , wherein the CCA value for the group of STAs associated with the second BSS is a minimum value of a ratio of a CCA threshold.
6. The method of claim 1 , wherein the AP is an IEEE 802.11 cluster head configured to control TPC and CCA for a plurality of STAs associated with the first BSS.
7. The method of claim 1 , wherein the CCA value is determined based on a baseline transmit power and a CCA threshold permitted in the first BSS.
8. The method of claim 1 , wherein the STA specific CCA parameter is less than a maximum CCA threshold.
9. An access point (AP) associated with a first Basic Service Set (BSS), the AP comprising:
a transmitter configured to transmit, to an IEEE 802.11 station (STA) associated with the first BSS, a Clear Channel Assessment (CCA) value for a group of STAs associated with a second BSS, the CCA value indicating a minimum CCA threshold for a packet received from the second BSS; and
a receiver configured to receive, from the IEEE 802.11 STA, a signal at a transmit power adjusted based on a target transmit power control (TPC) parameter of the IEEE 802.11 STA, wherein the target TPC parameter is determined based on the CCA value, a STA specific CCA parameter and a target CCA parameter, the target CCA parameter being greater than the STA specific CCA parameter.
10. The AP of claim 9 , wherein a sum of the target TPC parameter and the STA specific CCA parameter is constant.
11. The AP of claim 9 , wherein the adjusted transmit power is less than or equal to a maximum transmit power of the IEEE 802.11 STA.
12. The AP of claim 9 , wherein the STA specific CCA parameter indicates a CCA threshold for a packet received from the group of STAs associated with the second BSS.
13. The AP of claim 9 , wherein the CCA value for the group of STAs associated with the second BSS is a minimum value of a ratio of a CCA threshold.
14. The AP of claim 9 , wherein the AP is an IEEE 802.11 cluster head configured to control TPC and CCA for a plurality of STAs associated with the first BSS.
15. The AP of claim 9 , wherein the CCA value is determined based on a baseline transmit power and a CCA threshold permitted in the first BSS.
16. The AP of claim 9 , wherein the STA specific CCA parameter is less than a maximum CCA threshold.