Wireless Ranging Reports for Responder ID and CIR Fragment Parsing
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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 parsing fragmented channel impulse report (CIR) taps due to incomplete or missing fragments, leading to incorrect distance calculations and decompression 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 adding an indication in the PSDU to distinguish complete or partial RRs, ensuring correct 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 (contention resolution field and responder identifier) that mediates between the random contention process and the initiator's need to identify the winning responder. This field acts as a bridge carrying identification information from the responder back to the initiator without disrupting the contention-based access method.
Solution Approach 2:
The patent implements feedback by having the winning responder include its identification information in the response frame sent back to the initiator. This feedback loop allows the initiator to learn which responder won the contention while maintaining the random access mechanism, resolving the information loss problem.
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 fragmented RRs cause decompression issues when parts are missing
Solution Approach 1:
The patent applies segmentation by dividing the Channel Impulse Report (CIR) data into multiple fragments that can be transmitted separately in different Receive Reports. Each fragment is independently compressed per antenna pair, allowing flexible transmission while maintaining the ability to reconstruct the complete CIR when all fragments are received.
Solution Approach 2:
The patent uses preliminary action by including compression headers and fragmentation metadata in advance within each fragment. This preliminary structuring allows the receiving end to properly assemble and decompress the complete CIR data once all fragments are collected, preventing decompression errors from incomplete data.
3Duration of action of moving object
If the initiator sends One-to-many Poll Compact frames in subsequent sub-rounds after responders send first, then the transmission order is reversed, but the initiator still does not identify the responder
Solution Approach 1:
The patent introduces an intermediary field in the response frame that carries responder identification information. This intermediary mechanism ensures that regardless of which device transmits first in the sub-round, the initiator can always identify the responder through this dedicated information carrier.
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3(A)~3(C)
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 (512); and -b- transmitting the one-to-many initiator report to a responder (514). 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.