Channel Access Reporting for Unlicensed Spectrum Coexistence
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Solution Overview
Problem
Current wireless communication systems operating in unlicensed spectrum face challenges with inter-network and inter-system interference, particularly in high-frequency ranges above 52.6 GHz, where long-term channel sensing is necessary for fair coexistence with other systems like Wi-Fi/WiGig, but existing technologies only support short-term omni-directional Listen-Before Talk (LBT) mechanisms.
Innovation Solution
The implementation of procedures for measuring and reporting inter-system interference and channel availability in specific beam directions, using new RRC signaling to configure resources and periods for long-term sensing, and employing receiver assistance from User Equipment (UE) to aid the gNB with direction LBT or no-LBT modes, including the use of Layer-1 RSSI measurements based on Zero-Power CSI-RS for channel state information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If short-term omni-directional LBT mechanisms are used, then channel access is simple to implement, but long-term channel sensing capability is insufficient for fair coexistence in unlicensed spectrum
Solution Approach 1:
The patent segments channel sensing into multiple measurement resources distributed over time, where each resource provides a snapshot of channel conditions. The UE collects measurements from multiple such segmented resources to build long-term channel access statistics, transforming a continuous long-term sensing requirement into discrete manageable measurement instances.
Solution Approach 2:
The network pre-configures multiple measurement resources and spatial beams for the UE before the UE needs to perform channel access. This preliminary configuration allows the UE to have measurement capabilities ready in advance, enabling long-term sensing without requiring complex real-time decision-making during channel access attempts.
2Measurement precision
If long-term sensing with multiple measurement resources is implemented, then channel access statistics become more accurate, but device complexity increases
Solution Approach 1:
The patent uses universal measurement resources that can serve multiple purposes: they are used for both channel sensing and for other wireless communication functions. The same measurement infrastructure supports both LBT and no-LBT channel access modes, reducing the need for separate dedicated sensing hardware and simplifying device complexity while maintaining measurement precision.
Solution Approach 2:
The UE autonomously performs measurements on configured resources and automatically generates channel access reports based on collected data. The network provides the measurement configuration and receives the generated reports, with the UE's processing functions handling the intermediate complexity of aggregating multiple measurements into meaningful statistics without requiring extensive network intervention.
3Object-affected harmful factors
If receiver assistance from UE is provided for directional LBT, then interference management improves, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential channel access statistics information from the UE's measurements and sends only this condensed information to the network. Rather than transmitting raw measurement data from multiple resources, the UE processes measurements locally and extracts key statistics, significantly reducing signaling overhead while preserving the interference management benefits of directional sensing.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for measuring and reporting channel access statistics. One apparatus includes a processor and a transceiver that receives a configuration message from a network, said configuration message indicating a measurement resource for channel sensing and a spatial beam for the measurement resource. Here, the apparatus does not transmit on the measurement resource and the network also does not transmit on the measurement resource. The processor performs channel-sensing measurement using the indicated measurement resource and spatial beam and generates a channel access report using a plurality of channel-sensing measurements. The transceiver sends the channel access report to the network.