A system for wireless communication, wherein the system is a host device, the system comprising: a processor ; and a computer-readable memory storage device storing executable instructions that, based at least on an execution by the processor, cause the processor to: send a data frame to a first client device in response to a successful contention; receive a data-acknowledgment frame from the first client device in response to the data frame within a first predetermined time; transmit a series of data-acknowledgment frames to the first client device and a second client device within a second predetermined time in response to the successful contention, wherein a limit to a number of the series of data-acknowledgment frames sent in response to the successful contention is preset based on a total number of client devices within the network, wherein the series of data-acknowledgement frames comprises an aggregated frame, which is form by aggregating a response data-acknowledgment frame for the first client device with at least one data frame for the second client device; and which is sent to the first client device and the second client device within the first predetermined time after receiving the data-acknowledgement frame. a processor ; and a computer-readable memory storage device storing executable instructions that, based at least on an execution by the processor, cause the processor to: send a data frame to a first client device in response to a successful contention; receive a data-acknowledgment frame from the first client device in response to the data frame within a first predetermined time; transmit a series of data-acknowledgment frames to the first client device and a second client device within a second predetermined time in response to the successful contention, wherein a limit to a number of the series of data-acknowledgment frames sent in response to the successful contention is preset based on a total number of client devices within the network, wherein the series of data-acknowledgement frames comprises an aggregated frame, which is form by aggregating a response data-acknowledgment frame for the first client device with at least one data frame for the second client device; and which is sent to the first client device and the second client device within the first predetermined time after receiving the data-acknowledgement frame. send a data frame to a first client device in response to a successful contention; receive a data-acknowledgment frame from the first client device in response to the data frame within a first predetermined time; transmit a series of data-acknowledgment frames to the first client device and a second client device within a second predetermined time in response to the successful contention, wherein a limit to a number of the series of data-acknowledgment frames sent in response to the successful contention is preset based on a total number of client devices within the network, wherein the series of data-acknowledgement frames comprises an aggregated frame, which is form by aggregating a response data-acknowledgment frame for the first client device with at least one data frame for the second client device; and which is sent to the first client device and the second client device within the first predetermined time after receiving the data-acknowledgement frame. <EOS>