WLAN Data Frame Control Information Segmentation
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Solution Overview
Problem
The existing WLAN systems face inefficiencies in data exchange due to unnecessary overhead from legacy control information when supporting Machine to Machine (M2M) applications, particularly in new frequency bands, which limits throughput and power management in M2M supportive WLAN systems.
Innovation Solution
A method and apparatus for transmitting data frames in a WLAN system that excludes unnecessary legacy control information, using a format with a signal field including common and dedicated control information for MU-MIMO transmission, enhancing power management and throughput by supporting MU-MIMO transmission without backward compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy control information is included in PPDU for backward compatibility, then compatibility with existing WLAN systems is maintained, but unnecessary overhead occurs reducing throughput efficiency
Solution Approach 1:
The patent segments control information into two distinct parts: legacy control information (for backward compatibility) and new control information (for M2M applications). This segmentation allows the system to include only necessary control fields for M2M operations while maintaining compatibility with legacy stations, thereby reducing unnecessary overhead and improving throughput efficiency.
Solution Approach 2:
The patent extracts and removes unnecessary legacy control information fields from the PPDU structure that are not needed for M2M applications. By taking out only the essential control elements required for M2M operations while eliminating redundant legacy fields, the system achieves both backward compatibility and improved throughput efficiency.
2Productivity
If M2M supportive WLAN system uses new frequency band (900 MHz) without considering backward compatibility, then overhead is reduced, but compatibility with existing WLAN systems is lost
Solution Approach 1:
The patent applies local quality by making the PPDU structure adaptive to different operational contexts. For M2M applications in new frequency bands, the system uses a simplified control information structure with reduced overhead. For legacy WLAN operations, the system maintains the traditional control information structure. This localized optimization allows the system to achieve overhead reduction for M2M while preserving backward compatibility for legacy operations.
3Adaptability or versatility
If conventional PPDU transmission scheme is used including control information for legacy STAs, then legacy STA compatibility is maintained, but power management efficiency deteriorates due to unnecessary overhead
Solution Approach 1:
The patent implements a dynamic control information structure that adapts to the operational mode. When operating in M2M mode with M2M-capable stations, the system uses a simplified control information format that excludes legacy-specific fields, thereby improving power management efficiency. When legacy stations are present, the system dynamically includes the necessary legacy control fields. This dynamic adaptation allows the system to optimize power consumption for M2M applications while maintaining compatibility with legacy stations when needed.
Data Source
AI summary
A method of transmitting a data frame by a transmitter in a WLAN system is provided. The method includes generating a data block including at least one data units respectively transmitted through at least one or more spatial streams to at least one receiver, transmitting first control information to the at least one receiver, transmitting second control information to each receiver, and transmitting the data block to the at least one receiver. The first control information includes a length indicator for the data block, a MIMO indicator indicating whether the data block is for SU-MIMO or MU-MIMO, and a spatial stream indication field including information about the number of the spatial streams. The second control information includes a FEC coding field indicating an encoding scheme applied to the data unit and an MCS field indicating an MCS applied to the data unit.