Method and device for acquiring and transmitting data by an sta in a wireless local area network

A data acquisition device, configured to acquire data from an access point (AP) in a wireless local area network, comprising:

• a first transceiving unit, configured to, transmit a PS-Poll, and receive downlink data returned by the AP upon receipt of the PS-Poll in a reserved time period within a current beacon interval according to a traffic indication map (TIM) contained in a beacon, after learning that the AP has the downlink data of the data acquisition device according to the received beacon from the AP, wherein the reserved time period is a period of time interval within the beacon interval;
• and
• a second transceiving unit, configured to, retransmit the PS-Poll after the reserved time period to acquire the downlink data, when the first transceiving unit can not successfully receive the downlink data within the reserved time period.

A method for transmitting data by a station (STA) in a wireless local area network, for transmitting uplink data by the STA to an access point (AP) which it accesses, comprising:

• receiving, by the STA, a beacon transmitted by the AP, and transmitting an uplink data packet in a corresponding time slot within a reserved time period indicated by the beacon, wherein the reserved time period is a period of time interval within the beacon interval;
• and
• retransmitting, by the STA, the uplink data packet after the reserved time period if the number of retransmissions of the uplink data packet does not reach the maximum number of retransmissions, when the STA can not successfully transmit the uplink data packet within the reserved time period.

A data transmitting device configured to transmit uplink data to an access point (AP) which it accesses, comprising:

• a receiving unit, configured to receive a beacon transmitted by the AP, and transmit an uplink data packet in a corresponding time slot within a reserved time period indicated by the beacon, wherein the reserved time period is a period of time interval within the beacon interval;
• and
• a retransmitting unit, configured to retransmit the uplink data packet after the reserved time period if the number of retransmissions of the uplink data packet does not reach the maximum number of retransmissions, when the STA can not successfully transmit the uplink data packet within the reserved time period.

A method for acquiring data by a station (STA) in a wireless local area network, for acquiring data by the STA from an access point (AP) which it accesses, comprising:

• transmitting, by the STA, an indicating frame and receiving downlink data returned by the AP upon receipt of the indicating frame, in a reserved time period within a current beacon interval according to a traffic indication map (TIM) contained in a beacon, after learning that the AP has the downlink data of the STA according to the received beacon, wherein the reserved time period is a period of time interval within the beacon interval, and the indicating frame is a PS-Poll, a trigger frame Trigger or uplink data transmitted by the STA;
• and
• retransmitting, by the STA, the indicating frame after the reserved time period to acquire the downlink data, if the STA can not successfully receive the downlink data within the reserved time period.

A data acquisition device, configured to acquire data from an access point (AP) in a wireless local area network, comprising:

• a first transceiving unit, configured to, after learning that the AP has the downlink data of the data acquisition device according to a received beacon from the AP, transmit an indicating frame, and receive downlink data returned by the AP upon receipt of the indicating frame in a reserved time period within a current beacon interval according to a traffic indication map (TIM) contained in a beacon, after learning that the AP has the downlink data of the data acquisition device according to the received beacon from the AP, wherein the reserved time period is a period of time interval within the beacon interval, and the indicating frame is a PS-Poll, a trigger frame (Trigger) or uplink data transmitted by the STA;
• and
• a second transceiving unit, configured to, retransmit the indicating frame after the reserved time period to acquire the downlink data, when the first transceiving unit can not successfully receive the downlink data within the reserved time period.