Access method and apparatus
Embodiments of the present invention provide an access method, including: sending, to an access point, a first frame that carries uplink transmission requirement information; and if a second frame that carries information about an uplink transmission resource is received from the access point within agreed time period, sending uplink multi-user transmission data to the access point, where the uplink multi-user transmission data is transmitted on the uplink transmission resource; or if the second frame is not received within an agreed time period, accessing, by a station, a channel in a contention access manner that is based on carrier sense CSMA/CA. According to the method provided in the embodiments of the present invention, a channel access manner can be managed, a congestion degree of a system can be decreased, and channel utilization can be increased.
1. A communication method, comprising:
receiving, by a station from an access point, a beacon frame or a response frame, wherein the beacon frame or the response frame comprise a first value of a timer;
starting to decrease the timer from the first value, wherein the decreasing the timer comprises:
progressively decreasing the timer with time when a channel for uplink transmission is idle and suspending the progressive decreasing of the timer when the channel is busy;
when the station receives, from the access point, a trigger frame that carries information about an uplink transmission resource before the timer reaches 0, wherein
refraining from using a contention access manner that is based on carrier sense multiple access with collision avoidance (CSMA/CA);
sending, by the station to the access point, uplink transmission data according to the trigger frame; and
when receiving the trigger frame, resetting, by the station, the timer based on a second value that is specified by the access point, wherein the second value is specified in a message frame, and the timer is reset by multiplying a current value of the timer by the second value; and
when the station has not received a trigger frame from the access point before the timer reaches 0, accessing, by the station, a channel in a contention access manner that is based on CSMA/CA.
2. The communication method according to claim 1 , further comprising:
receiving a radio frame sent by the access point, wherein the radio frame indicates sending time of the trigger frame, and the radio frame is an association response frame, a beacon frame, or a response frame of the access point to a received data frame.
3. The communication method according to claim 1 , wherein
the information about the uplink transmission resource comprises at least one of the following: a packet arrival interval, packet size information, or traffic rate information.
4. A communication apparatus, comprising:
a receiver;
a transmitter;
at least one processor; and
one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to cause the apparatus to:
receive, through the receiver, from an access point, a beacon frame or a response frame, wherein the beacon frame or the response frame comprises a first value of a timer;
start to decrease the timer from the first value, wherein the decreasing the timer comprises:
progressively decreasing the timer with time when a channel for uplink transmission is idle and suspending the progressive decreasing of the timer when the channel is busy;
if the apparatus receives, from the access point, a trigger frame that carries information about an uplink transmission resource before the timer reaches 0,
refrain from using a contention access manner that is based on carrier sense multiple access with collision avoidance (CSMA/CA);
send, through the transmitter, to the access point, uplink transmission data according to the trigger frame; and
when receiving the trigger frame, reset the timer based on a second value that is specified by the access point, wherein the second value is specified in a message frame, and the timer is reset by multiplying a current value of the timer by the second value; and
if the apparatus has not received, from the access point, a trigger frame from the access point before the timer reaches 0, access a channel in a contention access manner that is based on CSMA/CA.
5. The communication apparatus according to claim 4 , wherein the one or more memories store programming instructions for execution by the at least one processor to cause the apparatus to:
receive, through the receiver a radio frame sent by the access point, wherein the radio frame indicates sending time of the trigger frame, and the radio frame is an association response frame, a beacon frame, or a response frame of the access point to a received data frame.
6. The communication apparatus according to claim 4 , wherein
the information about the uplink transmission resource comprises at least one of the following: a packet arrival interval, packet size information, or traffic rate information.
7. One or more non-transitory computer-readable media storing computer instructions, that when executed by one or more processors, cause a computing device to perform operations comprising:
receiving, by a station from an access point, a beacon frame or a response frame, wherein the beacon frame or the response frame comprise a first value of a timer;
starting to decrease the timer from the first value, wherein the decreasing the timer comprises:
progressively decreasing the timer with time when a channel for uplink transmission is idle and suspending the progressive decreasing of the timer when the channel is busy;
when the station receives, from the access point, a trigger frame that carries information about an uplink transmission resource before the timer reaches 0, wherein
refraining from using a contention access manner that is based on carrier sense multiple access with collision avoidance (CSMA/CA);
sending, by the station to the access point, uplink transmission data according to the trigger frame; and
when receiving the trigger frame, resetting, by the station, the timer based on a second value that is specified by the access point, wherein the second value is specified in a message frame, and the timer is reset by multiplying a current value of the timer by the second value; and
when the station has not received a trigger frame from the access point before the timer reaches 0, accessing, by the station, a channel in a contention access manner that is based on CSMA/CA.
8. The one or more non-transitory computer-readable media according to claim 7 , wherein the operations further comprise:
receiving a radio frame sent by the access point, wherein the radio frame indicates sending time of the trigger frame, and the radio frame is an association response frame, a beacon frame, or a response frame of the access point to a received data frame.
9. The one or more non-transitory computer-readable media according to claim 7 , wherein the information about the uplink transmission resource comprises at least one of the following: a packet arrival interval, packet size information, or traffic rate information.