Symmetric transmit opportunity (TXOP) truncation

1 . A method for a mobile terminal, the method comprising:

sending, to a network device, a first control message requesting to send uplink data;

receiving, from the network device, a second control message indicating a transmission opportunity for the mobile terminal to send the uplink data to the network device, wherein the transmission opportunity comprises a transmission duration over frequency resources;

in response to receiving the second control message, sending, to the network device, the uplink data during the transmission opportunity after a brief time period;

receiving, from the network device, downlink data;

receiving, from the network device, a third control message comprising an end-of-transmit-opportunity (EOT) indication associated with a final data frame of the downlink data;

in response to receiving the third control message, sending, to the network device, a fourth control message comprising a contention-free end (CF-end) frame, wherein a basic service set identifier (BSSID) field of the CF-end frame includes an identifier of the network device such that the CF-end frame is specific to the network device and avoids collisions between multiple network devices transmitting CF-end response frames; and

receiving, from the network device, a fifth control message comprising an identification associated with a plurality of wireless devices including the mobile terminal, and an indication of a cancellation of the transmission opportunity.

2 . The method of claim 1 , wherein the network device is a base station.

3 . The method of claim 1 , wherein the plurality of wireless devices includes wireless devices that cannot receive a transmission from the wireless device that is permitted to transmit for the transmission opportunity.

4 . The method of claim 1 , wherein:

transmitting, to the network device, in a transmission duration after a cancellation duration.

5 . The method of claim 4 , wherein the cancellation duration is a network allocation vector.

6 . An apparatus comprising:

a processor; and

a memory having instructions stored thereon that, when executed by the processor, cause the apparatus to:

send a first control message to a network device to request to send uplink data;

receive, from the network device, a second control message indicating a transmission opportunity for the apparatus to send the uplink data to the network device, wherein the transmission opportunity comprises a transmission duration over frequency resources

send, to the network device, the uplink data during the transmission opportunity, after a brief time period, in response to receiving the second control message,

receive, from the network device, downlink data;

receive, from the network device, a third control message comprising an end-of-transmit-opportunity (EOT) indication associated with a final data frame of the downlink data;

send, to the network device, a fourth control message comprising a contention-free end (CF-end) frame, wherein a basic service set identifier (BSSID) field of the CF-end frame includes an identifier of the network device such that the CF-end frame is specific to the network device and avoids collisions between multiple network devices transmitting CF-end response frames; and

receive, from the network device, a fifth control message comprising an identification associated with a plurality of wireless devices including the apparatus and an indication of a cancellation of the transmission opportunity.

7 . The apparatus of claim 6 , wherein the apparatus is a mobile station.

8 . The apparatus of claim 6 , wherein the plurality of wireless devices includes wireless devices that cannot receive a transmission from the wireless device that is permitted to transmit for the transmission opportunity.

9 . The apparatus of claim 6 , wherein one of the plurality of wireless devices transmits to the network device in a transmission duration after a cancellation duration.

10 . The apparatus of claim 9 , wherein the cancellation duration is a network allocation vector.

11 . A non-transitory computer readable storage medium storing instruction, the instructions when executed by a processor a mobile terminal cause the processor to execute a method comprising:

sending, to a network device, a first control message requesting to send uplink data;

receiving, from the network device, a second control message indicating a transmission opportunity for the mobile terminal to send the uplink data to the network device, wherein the transmission opportunity comprises a transmission duration over frequency resources;

in response to receiving the second control message, sending, to the network device, the uplink data during the transmission opportunity after a brief time period;

receiving, from the network device, downlink data;

receiving, from the network device, a third control message comprising an end-of-transmit-opportunity (EOT) indication associated with a final data frame of the downlink data;

in response to receiving the third control message, sending to the network device, a fourth control message comprising a contention-free end (CF-end) frame, wherein a basic service set identifier (BSSID) field of the CF-end frame includes an identifier of the network device such that the CF-end frame is specific to the network device and avoids collisions between multiple network devices transmitting CF-end response frames; and

receiving, from the network device, a fifth control message comprising an identification associated with a plurality of wireless devices including the mobile terminal and an indication of a cancellation of the transmission opportunity.

12 . The non-transitory computer readable storage medium of claim 11 , wherein the network device is a base station.

13 . The non-transitory computer readable storage medium of claim 11 , wherein the plurality of wireless devices includes wireless devices that cannot receive a transmission from the wireless device that is permitted to transmit for the transmission opportunity.

14 . The non-transitory computer readable storage medium of claim 11 , wherein the method further comprises:

transmitting, to the network device, in a transmission duration after a cancellation duration.

15 . The non-transitory computer readable storage medium of claim 14 , wherein the cancellation duration is a network allocation vector.