Wireless Ranging Reports With RPA Hash and CIR Fragment Flags
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Solution Overview
Problem
In wireless communications, existing technologies face challenges in accurately identifying responders during contention-based one-to-many multi-millisecond ranging and in decompressing channel impulse report (CIR) taps due to incomplete or missing fragments, leading to incorrect distance calculations and parsing issues.
Innovation Solution
Implementing a one-to-many initiator report containing a resolvable private address (RPA) hash calculated using the responder's identity resolving key (IRK) and using indication bits to determine complete or partial channel impulse report (CIR) segments, ensuring accurate responder identification and decompression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If responders contend for access by randomly choosing ranging sub-rounds in one-to-many contention-based ranging, then multiple responders can transmit simultaneously, but the initiator cannot identify which responder won the contention
Solution Approach 1:
The patent introduces an intermediary mechanism (polling scheme and response indicator field) that mediates between the contention-based transmission and the initiator's need for identification. The responder that wins contention sets a response indicator bit in its transmitted frame, and the initiator polls responders to identify which one won contention, thus preserving identification information while maintaining simultaneous transmission capability
Solution Approach 2:
The patent implements a feedback mechanism where the initiator polls responders after contention-based transmission, and responders provide feedback through response indicator fields in their frames. This feedback loop enables the initiator to identify which responder won contention without disrupting the efficiency of simultaneous transmissions
2Productivity
If CIR taps are compressed per Tx/Rx antenna pair to enable decompression on per Receive Report basis, then data transmission efficiency improves, but receivers cannot determine whether received fragments are complete or partial
Solution Approach 1:
The patent uses indication bits (acting as signal 'colors') to mark the state of fragments. Specific bit patterns indicate whether a fragment is complete or partial, enabling receivers to quickly determine fragment status without decompressing the data, thus maintaining transmission efficiency while providing completeness information
Solution Approach 2:
The patent embeds fragment completeness indication information in advance within the compressed data structure itself. This preliminary marking allows receivers to determine fragment status before attempting decompression, preventing parsing errors while maintaining the efficiency benefits of compression
3Reliability
If receivers do not receive complete fragments of CIR reports, then decompression cannot be performed correctly, but requesting retransmission increases communication overhead
Solution Approach 1:
The patent enables receivers to self-diagnose fragment completeness using the embedded indication bits. When fragments are complete, decompression proceeds automatically without external intervention. This self-service mechanism reduces the need for retransmission requests and associated communication overhead while maintaining decompression accuracy
Data Source
AI summary
Techniques pertaining to enhancements to ranging and reporting in wireless communications are described. An apparatus (e.g., an initiator) performs a one-to-many contention-based ranging operation by: (a) generating a one-to-many initiator report; and (b) transmitting the one-to-many initiator report to a responder. The one-to-many initiator report contains a resolvable private address (RPA) hash calculated using an identity resolving key (IRK) of one of the responder.