PPDU Bandwidth Determination with Scrambling-Sequence Error Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bandwidth negotiation methods in wireless local area networks are inefficient and lead to unnecessary retransmissions and channel contention due to errors in indicating bandwidth using unprotected bits in scrambling sequences and service fields.
Innovation Solution
A method to determine bandwidth for communication by utilizing bits in the scrambling sequence and service field of a PPDU, allowing for continued negotiation and error handling to avoid discarding frames, thereby reducing retransmissions and conserving air interface resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bandwidth indication bits in service field are used without protection, then bandwidth negotiation can be performed, but check errors occur leading to unnecessary frame discarding and retransmission
Solution Approach 1:
The patent applies preliminary action by performing CRC check on bandwidth indication bits before discarding the frame. The receiving device checks the validity of bandwidth indication information in advance using CRC verification, and only discards the frame when the check fails. This prevents premature discarding due to undetected errors and allows recovery through alternative bandwidth determination methods.
Solution Approach 2:
The patent implements beforehand cushioning by providing backup mechanisms for bandwidth determination. When CRC check fails on bandwidth indication bits, the system has pre-prepared alternative methods including using bandwidth information from other fields, default bandwidth values, or negotiation protocols to ensure continuous operation without immediate retransmission.
2Measurement precision
If frames are discarded upon check error in bandwidth bits, then reliable error detection is achieved, but unnecessary retransmissions and channel contention increase
Solution Approach 1:
The patent performs CRC verification as a preliminary check before frame discarding. This allows the system to confidently identify genuine errors while avoiding premature discarding of valid frames, thereby reducing unnecessary retransmissions and associated delays.
Solution Approach 2:
The patent implements feedback mechanisms where the receiving device can send acknowledgment or request retransmission only when necessary. By using CRC check results to guide the decision-making process, the system provides accurate feedback to the transmitting device, avoiding unnecessary retransmissions while ensuring reliable error correction when needed.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A bandwidth determining method, a device, a storage medium, and a program product are provided. In the bandwidth determining method, a first device receives a physical layer protocol data unit PPDU from a second device, where the PPDU is used to determine a scrambling sequence and a service field, and a first group of bits in the scrambling sequence and a second group of bits in the service field indicate a bandwidth. Then, if a check error occurs in the second group of bits, the first device determines a bandwidth for communication between the first device and the second device based on the first group of bits. When the check error occurs in the second group of bits, determining of the bandwidth for communication is not abandoned. This avoids unnecessary retransmission or channel contention.