Uplink Resource Allocation in Unlicensed Spectrum
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently allocating frequency domain resources for uplink communication in unlicensed spectrum, particularly in ensuring fair coexistence with other users and maintaining performance under Listen-Before-Talk (LBT) procedures.
Innovation Solution
The implementation of bitmap-based and resource indication value (RIV)-based frequency domain resource allocation schemes, which allow wireless devices to determine and utilize allocated frequency domain resources for uplink transmission in unlicensed spectrum, incorporating higher layer signaling and flexible interlace configurations to adapt to varying subcarrier spacings and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bitmap-based or RIV-based frequency domain resource allocation schemes are implemented in unlicensed spectrum, then resource allocation flexibility and coexistence fairness are improved, but system complexity and signaling overhead increase
Solution Approach 1:
The frequency domain resources are segmented into multiple interlaces, where each interlace consists of non-contiguous resource blocks distributed across the bandwidth. This segmentation allows the system to allocate resources in a flexible manner while maintaining manageable complexity through standardized interlace structures.
Solution Approach 2:
The patent implements dynamic resource allocation by allowing the network to switch between bitmap-based and RIV-based allocation schemes depending on channel conditions and traffic requirements. The allocation method is dynamically adapted through higher layer signaling, enabling the system to optimize between flexibility and complexity based on current operational needs.
2Reliability
If Listen-Before-Talk procedures are implemented to ensure fair coexistence, then fairness with other users is improved, but uplink transmission efficiency deteriorates
Solution Approach 1:
The system performs Listen-Before-Talk procedures before uplink transmission to ensure fair access to unlicensed spectrum. By checking channel availability in advance and only proceeding with transmission when the channel is clear, the system maintains fairness with other users while minimizing unnecessary transmission attempts that would waste resources.
Solution Approach 2:
The patent adjusts LBT parameters such as contention window sizes and backoff counters based on channel conditions and priority levels. By dynamically changing these parameters, the system can balance fairness requirements with transmission efficiency, allowing higher priority traffic to access the channel more quickly while still maintaining overall fairness.
3Adaptability or versatility
If multiple frequency domain resource allocation schemes are supported, then adaptability to different scenarios is improved, but determination and configuration complexity increases
Solution Approach 1:
The patent designs a universal resource allocation framework that can operate with either bitmap-based or RIV-based schemes depending on configuration. The same fundamental interlace structure and signaling mechanisms are used regardless of which allocation method is selected, allowing the system to support multiple schemes without proportionally increasing complexity.
Solution Approach 2:
Higher layer signaling acts as an intermediary that configures the appropriate resource allocation scheme based on network conditions and requirements. This intermediary layer abstracts the complexity of scheme selection and configuration from the physical layer operations, allowing flexible adaptation while maintaining manageable implementation complexity.
Data Source
AI summary
Apparatuses, systems, and methods for providing frequency domain resource allocation schemes for use in unlicensed spectrum. A wireless device may determine a frequency domain resource allocation scheme for use for uplink communication in unlicensed spectrum. The wireless device may receive information indicating a frequency domain resource allocation for an uplink communication in unlicensed spectrum in accordance with the frequency domain resource allocation scheme. The wireless device may perform the uplink communication using the indicated frequency domain resource allocation.