Multi-Link CQI Feedback Using Interference Offset Frames
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Solution Overview
Problem
Existing CQI sounding protocols in IEEE 802.11be for multi-link devices (MLDs) do not account for interference between link pairs, leading to sub-optimal estimation of link quality and vulnerability to attacks in block acknowledgment (BA) mechanisms.
Innovation Solution
Enhanced CQI measurement methods and apparatuses that consider interference between link pairs, including the use of CQI offset frames to provide additional interference information and dynamic switching between STR and NSTR modes, and protected BA mechanisms to prevent false indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CQI sounding protocols are used for multi-link devices, then channel quality information can be obtained, but interference between link pairs is not accounted for leading to sub-optimal estimation
Solution Approach 1:
The patent segments the CQI feedback into two parts: initial CQI value and CQI offset value. The initial CQI is measured without interference consideration, while the CQI offset separately captures the interference impact from simultaneous transmissions on other links. This segmentation allows both components to be reported independently and combined for accurate channel quality estimation.
Solution Approach 2:
The CQI offset acts as an intermediary parameter that mediates between the initial CQI measurement and the final accurate channel quality assessment. It carries the interference information from other links as a separate component, which is then combined with the initial CQI to produce the corrected channel quality value, thereby preserving interference information that would otherwise be lost.
2Productivity
If block acknowledgment mechanism is used, then aggregation of multiple MPDUs is enabled, but vulnerability to attacks increases due to false indications
Solution Approach 1:
The patent implements preliminary verification actions before accepting block acknowledgments. The receiving device verifies the authenticity of BA frames by checking sequence numbers and other validation parameters before processing the aggregated acknowledgment, thereby preventing false indications from compromising the system while maintaining aggregation efficiency.
3Adaptability or versatility
If dynamic switching between STR and NSTR modes is implemented, then adaptability to different scenarios is improved, but complexity of link management increases
Solution Approach 1:
The patent implements dynamic mode switching between STR (simultaneous transmit and receive) and NSTR (non-simultaneous transmit and receive) modes based on real-time channel conditions and interference levels. The system can adaptively select the appropriate mode for each link pair, improving versatility while managing complexity through standardized switching criteria and procedures defined in the protocol.
Data Source
AI summary
Methods and apparatuses for facilitating enhanced channel quality measurements on links of a multi-link device (MLD) in a wireless local area network. A non-access point (AP) MLD comprises stations (STAs), each comprising a transceiver configured to form a link with a corresponding AP affiliated with an AP MLD and receive, over the link, a channel sounding signal. The non-AP MLD further comprises a processor configured to determine, based on the channel sounding signal received at a first time over a first one of the links, an initial channel quality indicator (CQI) value for the first link, and determine, based on interference caused on the first link by a second one of the links at a second time, a CQI offset value for the first link relative to the initial CQI value. The transceivers are configured to transmit, to the AP MLD, the initial CQI value and the CQI offset value.