AIoT Uplink Resource Mapping with Identity-Based Cyclic Shifts
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Solution Overview
Problem
Existing communication systems face challenges in efficiently allocating orthogonal resources for uplink transmissions from multiple Ambient Internet of Things (AIoT) devices, particularly in scenarios where the number and locations of these devices are a priori unknown, leading to potential collisions and demodulation failures at the reader.
Innovation Solution
AIoT devices determine their uplink resources based on a configuration provided in a downlink transmission, using a resource mapping that incorporates their identity and the activator's identity, ensuring orthogonal resource allocation through a cyclic shift of time-frequency-sequence patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual resource allocation signaling is used for each AIoT device, then resource allocation accuracy is improved, but system complexity and signaling overhead increase
Solution Approach 1:
AIoT devices autonomously determine their own uplink transmission resources by applying cyclic shifts to base sequences according to their device identities, eliminating the need for individual resource allocation signaling from the network side. This self-service mechanism resolves the contradiction by achieving accurate resource allocation without increasing system complexity or signaling overhead.
Solution Approach 2:
The patent transforms the resource allocation approach by changing parameters (device identity, cyclic shift values, base sequence indices) that devices use to autonomously select resources. Instead of network-provided allocation signals, devices modify these parameters based on their identities to determine unique time-frequency resources, resolving the contradiction between allocation accuracy and system complexity.
2Reliability
If orthogonal resources are allocated to multiple AIoT devices, then resource conflict is avoided, but resource allocation complexity increases
Solution Approach 1:
The patent segments the available uplink resources into multiple orthogonal resources by applying different cyclic shifts to base sequences. Each AIoT device is assigned a unique segment (resource) determined by its identity, ensuring orthogonality and avoiding conflicts. This segmentation approach maintains reliability while simplifying allocation complexity through a systematic, identity-based segmentation mechanism.
Solution Approach 2:
The patent employs periodic cyclic shifts of base sequences to generate orthogonal resources. Devices apply cyclic shifts at regular intervals based on their identities, creating a periodic pattern that ensures orthogonal resource allocation. This periodic action resolves the contradiction by providing systematic conflict avoidance through a simple, repeatable mechanism rather than complex allocation procedures.
3Measurement precision
If resource mapping configuration is provided in downlink transmission, then resource determination accuracy is improved, but downlink signaling overhead increases
Solution Approach 1:
The patent extracts the resource determination function from network signaling and transfers it to AIoT devices. Instead of providing detailed resource allocation signals in downlink transmissions, the network only provides base sequence sets and cyclic shift parameters. Devices extract and apply their own identities to these parameters to determine resources, eliminating the need for extensive downlink signaling while maintaining determination accuracy.
Solution Approach 2:
The patent uses copying by having devices replicate base sequences with different cyclic shifts according to their identities. Instead of the network transmitting unique resource allocations to each device, devices copy the base sequence template and modify it using their identity-based cyclic shifts. This copying mechanism achieves accurate resource determination without increasing downlink signaling overhead.
Data Source
AI summary
An ambient internet of things, AIoT, device including means for obtaining an identity of the AIoT device, receiving a downlink transmission from at least one activator apparatus, wherein the downlink transmission includes a configuration of a resource mapping, wherein the configuration of the resource mapping is for uplink transmission from the AIoT device, determining a resource for uplink transmission based, at least in part, on the configuration of the resource mapping and the identity of the AIoT device and performing uplink transmission, in response to the downlink transmission, using the determined resource for the uplink transmission.