VHT-SIG Segmentation for 802.11ac Packet Decoding
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Solution Overview
Problem
The IEEE 802.11ac standard lacks a defined frame architecture and padding scheme, leading to inefficiencies in packet processing and incompatibility with the IEEE 802.11n standard, particularly in decoding and power consumption.
Innovation Solution
A method for arranging packets in a wireless communication system that includes generating two VHT-SIG fields and arranging legacy training, signal, and long training fields in a predetermined sequence to facilitate efficient decoding and compatibility with the IEEE 802.11n standard, using a preamble portion with a specific sequence of fields to enhance decoding efficiency and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single VHT-SIG field is used to indicate maximum duration for all users, then the frame structure is simplified, but the decoder cannot obtain individual MPDU length information and must continue processing until detecting an EOF flag, increasing power consumption
Solution Approach 1:
The VHT-SIG field is segmented into two separate fields: VHT-SIG A indicating maximum duration for all users, and VHT-SIG B indicating individual MPDU length information. This segmentation allows the decoder to obtain precise length information for each user's data portion, enabling early termination of decoding and reducing power consumption while maintaining structured organization
2Reliability
If padding fields and tail fields are appended sequentially after the EOF flag, then the packet structure is completed, but the circuit processing complexity increases and compatibility with IEEE 802.11n is lost
Solution Approach 1:
The patent inverts the conventional padding approach by placing the tail field before the padding fields in the packet structure. This inversion simplifies circuit processing by enabling more efficient field identification and processing sequences, while maintaining complete packet structure and compatibility considerations with IEEE 802.11n
3Productivity
If the IEEE 802.11ac packet structure is defined independently without reference to IEEE 802.11n, then specific optimizations can be achieved, but compatibility with the legacy standard is lost
Solution Approach 1:
The patent implements multi-functionality by designing the IEEE 802.11ac packet structure to serve both new and legacy standards. The dual VHT-SIG field design and reordered field sequences enable optimized decoding efficiency for 802.11ac while maintaining structural compatibility with 802.11n, allowing the same packet framework to fulfill multiple standard requirements
Data Source
AI summary
A method of arranging a packet in a wireless communication system includes a preamble sequence and a data sequence. The preamble sequence includes a legacy training field (L-TF), a legacy signal field (L-SIG), a very high throughput signal field (VHT-SIG), a very high throughput short training field (VHT-STF) and at least one very high throughput long training field (VHT-LTF). The method includes generating a first VHT-SIG field and a second VHT-SIG field according to the VHT-SIG field; and arranging the L-TF field, the L-SIG field, the first VHT-SIG field, the VHT-STF field, one of the at least one VHT-LTF fields, the second VHT-SIG field and the rest of the at least one VHT-LTF fields in a predetermined sequence.