Spatial-reuse based TXOP sharing for random access transmissions
A wireless station ( 11 ) determines a path loss of a wireless signal path between the wireless station ( 11 ) and a first access point ( 10 ). The first access point ( 10 ) cooperates with a second access point ( 10 ) by sharing a transmit opportunity based on coordinated spatial reuse of at least one resource of the shared transmit opportunity. Further, the wireless station ( 11 ) receives, from the second access point ( 10 ), an indication of a level of allowed interference on the at least one resource of the shared transmit opportunity. Based on the determined path loss and the indication of the level of allowed interference, the wireless station ( 11 ) controls a transmit power of at least one wireless random access transmission performed on the at least one resource of the shared transmit opportunity from the wireless station ( 11 ) to the second access point ( 10 ).
1 . A method of controlling wireless communication in a wireless communication system, performed by a wireless station, the method comprising:
determining a path loss of a wireless signal path between the wireless station and a first access point, the first access point cooperating with a second access point by sharing a transmit opportunity (TXOP) based on coordinated spatial reuse of at least one resource of the shared TXOP;
receiving, from the second access point, an indication of a level of allowed interference on the at least one resource of the shared TXOP; and
controlling, based on the determined path loss and the indication of the level of allowed interference, a transmit power of at least one wireless random access transmission performed on the at least one resource of the shared TXOP from the wireless station to the second access point.
2 . The method of claim 1 , further comprising the receiving, from the second access point, an indication of an identity of the first access point.
3 . The method of claim 1 , further comprising:
performing, one or more measurements; and
determining the path loss based on the one or more measurements.
4 . The method of claim 3 , further comprising:
receiving, from the second access point, an indication of a lower bound of the path loss; and
determining the path loss to correspond to the lower bound in response to a failure to determine the path loss based on the one or more measurements.
5 . The method of claim 4 , wherein the lower bound depends on a path loss of a wireless signal path between the first access point and the second access point.
6 . The method of claim 1 , further comprising receiving, from the second access point, an indication of resources of the shared TXOP.
7 . The method of claim 4 , further comprising receiving the indication of the lower bound of the path loss, an indication of resources of the shared TXOP, and/or the indication of an identity of the first access point in a trigger message for triggering one or more wireless transmissions in the shared TXOP.
8 . The method of claim 1 , wherein the level of allowed interference is based on a maximum tolerable level of interference at the first access point.
9 . The method of claim 1 , further comprising selecting randomly the at least one resource from the shared TXOP.
10 . A method of controlling wireless communication in a wireless communication system, performed by an access point, the method comprising:
cooperating with a further access point of the wireless communication system by sharing a transmit opportunity (TXOP) based on coordinated spatial reuse of at least one resource of the shared TXOP;
receiving, from the further access point, an indication of a first level of allowed interference on the at least one resource of the shared TXOP;
sending, to a wireless station, based on the first level of allowed interference, an indication of a second level of allowed interference on the at least one resource of the shared TXOP, to be applied by the wireless station in controlling a wireless random access transmission on the at least one resource of the shared TXOP; and
receiving, from the wireless station, at least one wireless random access transmission performed on the at least one resource of the shared TXOP, a transmit power of the at least one wireless random access transmission depending on the indicated second level of allowed interference.
11 . The method of claim 10 , further comprising sending, to the wireless station, an indication of an identity of the further access point.
12 . The method of claim 11 , sending the indication of the second level of allowed interference, an indication of a lower bound of the path loss, an indication of the at least one resource of the shared TXOP, and/or an indication of the identity of the further access point in a trigger message for triggering one or more wireless transmissions in the shared TXOP.
13 . The method of claim 10 , wherein the transmit power is further based on one or more measurements performed by the wireless station to determine a path loss of a wireless signal path between the wireless station and the further access point.
14 . The method of claim 13 , further comprising sending, to the wireless station, an indication of a lower bound of the path loss, wherein the transmit power is further based on the indicated lower bound.
15 . The method of claim 14 , wherein the lower bound depends on a path loss of a wireless signal path between the further access point and the access point.
16 . The method of claim 15 , further comprising performing one or more measurements to determine the path loss of the wireless signal path between the further access point and the access point.
17 . The method of claim 16 , further comprising determining the path loss of the wireless signal path between the further access point and the access point based on one or more measurement reports from the further access point.
18 . The method of claim 10 , further comprising sending, to the wireless station, an indication of resources of the shared TXOP.
19 . A wireless station for controlling wireless communication in a wireless communication system, the wireless station comprising:
processing circuitry and memory, the memory containing instructions executable by the processing circuitry, whereby the wireless station is operative to:
determine a path loss of a wireless signal path between the wireless station and a first access point, the first access point cooperating with a second access point by sharing a transmit opportunity (TXOP) based on coordinated spatial reuse of at least one resource of the shared TXOP;
receive, from the second access point, an indication of a level of allowed interference on the at least one resource of the shared TXOP; and
control, based on the determined path loss and the indication of the level of allowed interference, a transmit power of at least one wireless random access transmission performed on the at least one resource of the shared TXOP from the wireless station to the second access point.
20 . An access point for controlling wireless communication in a wireless communication system, the access point comprising:
processing circuitry and memory, the memory containing instructions executable by the processing circuitry whereby the access point is operative to:
cooperate with a further access point of the wireless communication system by sharing a transmit opportunity (TXOP) based on coordinated spatial reuse of at least one resource of the shared TXOP;
receive, from the further access point, an indication of a first level of allowed interference on the at least one resource of the shared TXOP;
send, to a wireless station, based on the first level of allowed interference, an indication of a second level of allowed interference on the at least one resource of the shared TXOP, to be applied by the wireless station in controlling a wireless random access transmission on the at least one resource of the shared TXOP; and
receive, from the wireless station, at least one wireless random access transmission performed on the at least one resource of the shared TXOP, a transmit power of the at least one wireless random access transmission depending on the indicated second level of allowed interference.