WLAN Terminal Emergency Data Notification via PS-Poll
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Solution Overview
Problem
In WLAN systems using unlicensed bands below 1 GHz, there is a delay in sending emergency burst data due to the AP's inability to identify the priority of burst data, leading to transmission delays and reduced success rates in emergency service data transmission.
Innovation Solution
A method and device for sending notification information to the AP to preferentially allocate wireless transmission resources for designated service types, including determining channel states, sending notification information when channels are idle, and using priority information to manage data transmission, thereby reducing transmission delays and improving burst data success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal in power-saving mode monitors the wireless channel and sends a wireless frame to notify the AP of uplink data, then reliable transmission of uplink data is ensured, but emergency burst data experiences transmission delay due to AP's inability to distinguish data priorities
Solution Approach 1:
The terminal performs preliminary action by setting the Emergency Indication field in the PS-Poll frame before sending it to the AP. This allows the AP to identify emergency data priorities in advance and allocate transmission resources accordingly, resolving the contradiction by enabling priority-based handling without compromising transmission reliability
Solution Approach 2:
The AP uses feedback from the Emergency Indication field in the PS-Poll frame to adjust its resource allocation decisions. When the field indicates emergency data, the AP prioritizes resource allocation for that terminal, thereby reducing transmission delay while maintaining reliable transmission through controlled channel access
2Use of energy by moving object
If the terminal enters sleep state to save power, then power consumption is reduced, but emergency data cannot be sent immediately when detected
Solution Approach 1:
The terminal performs preliminary action by setting the Emergency Indication field in the PS-Poll frame before entering sleep mode. This preliminary signaling ensures that when the terminal wakes up to send emergency data, the AP is already aware of the high priority nature of the data and can immediately allocate transmission resources, thus enabling fast emergency data transmission while maintaining power-saving operation
Solution Approach 2:
The system dynamically adjusts resource allocation based on the Emergency Indication field value. When emergency data is detected, the terminal transitions from passive power-saving mode to active transmission mode with prioritized resource allocation, allowing rapid response to emergency conditions while maintaining low power consumption during normal operation
3Device complexity
If the AP processes burst data in sequence of arrival, then simple processing is maintained, but emergency service data experiences transmission delay
Solution Approach 1:
The terminal performs preliminary action by setting the Emergency Indication field in the PS-Poll frame before data transmission. This allows the AP to identify emergency data priorities in advance and allocate transmission resources accordingly, resolving the contradiction by enabling priority-based handling without increasing processing complexity
Solution Approach 2:
The AP applies local quality differentiation by treating frames with Emergency Indication field set to 1 differently from normal frames. Emergency frames receive prioritized resource allocation while normal frames follow standard processing, thus reducing emergency data transmission delay without significantly increasing overall system complexity
Data Source
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AI summary
Provided are a service data transmission processing method and device applied to a STA of a WLAN, and a service data transmission method and device. The transmission processing method includes that service data of a designated service type required to be sent by the STA is acquired; notification information is sent to an AP of the WLAN, wherein the notification information is used for instructing the AP to preferentially allocate a wireless transmission resource for sending the service data of the designated service type. Technical problems including a delay in sending emergency burst data due to the fact that an AP fails to identify the priority of the burst data during the sending of the emergency service data are solved by means of the technical solution, thereby reducing transmission delay of the emergency service data while improving the success rate of burst transmission of the emergency service data.