Wireless Response Frame BSS Identification via Address Field Nesting
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Solution Overview
Problem
In wireless LAN systems, station devices (STA) cannot determine whether a response frame is a signal of their own basic service set (BSS) due to the absence of a transmitting station address field, leading to issues with setting Network Allocation Vectors (NAV) and ensuring compatibility with lower version devices.
Innovation Solution
A communication device and method that generate and transmit response frames with BSS identification information in the receiving station address field, allowing STAs to determine if the frame is from their own BSS, while maintaining compatibility with lower version devices by omitting parts of the MAC address and adding BSS identification information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If BSS identification information is added to the response frame format, then STAs can determine whether the frame is from their own BSS, but downward compatibility with lower version devices is compromised
Solution Approach 1:
The patent embeds BSS identification information within the existing receiving station address field structure. The information is nested in the lower-order bits of the address field, allowing higher version devices to extract BSS ID while lower version devices simply ignore the additional bits and process the frame as before, thus achieving both improved identification accuracy and downward compatibility.
Solution Approach 2:
The patent applies different processing rules to different parts of the address field based on device version. Higher version devices interpret the lower-order bits as BSS identification information, while lower version devices treat the entire field as traditional MAC addresses. This local differentiation allows the system to maintain backward compatibility while enabling enhanced functionality for newer devices.
2Measurement precision
If the transmitting station address field is added to the response frame, then STAs can determine BSS ownership, but the frame format complexity increases
Solution Approach 1:
The patent makes the receiving station address field serve multiple functions: it continues to store the MAC address of the receiving station for basic identification, and simultaneously embeds BSS identification information in the lower-order bits. This multi-functionality eliminates the need for a separate transmitting station address field while enabling accurate BSS determination.
Solution Approach 2:
The patent merges the BSS identification function with the existing receiving station address field. Instead of adding a separate field, the patent combines BSS ID and station address information into a single field, reducing frame format complexity while maintaining the ability to determine BSS ownership accurately.
3Reliability
If new frame format is implemented, then BSS determination is enabled, but compatibility with legacy devices is reduced
Solution Approach 1:
The patent implements dynamic frame format interpretation based on device capability. Devices automatically detect whether they are operating in a mode that supports BSS identification and process the address field accordingly. This dynamic adaptation allows the system to maintain reliability for BSS determination while ensuring compatibility with legacy devices that operate in modes without BSS ID functionality.
Data Source
AI summary
[Object] To enable the communication device that has received a response frame to determine whether or not the response frame is a signal of the own BSS, while ensuring downward compatibility.[Solution] Provided is a communication device including: a generation unit configured to generate a response frame prescribed in IEEE802.11 by setting a value corresponding to a BSS to which the own device belongs in a receiving station address field of the response frame; and a transmission unit configured to transmit the response frame.