NR Uplink Beam-Time Allocation for Unlicensed Spectrum Sharing
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Solution Overview
Problem
The challenge of frequent LBT (Listen Before Talk) in uplink transmission on unlicensed spectrum in NR systems and the need to improve resource utilization and transmission efficiency by multiple UEs sharing unlicensed spectrum resources is addressed.
Innovation Solution
A method for wireless communication that allocates different time domain resources or initial transmitting times to UEs using spatial parameter sets, where beams in a beam set have low correlation or long-distance deviation to reduce inter-user interference, and dynamically adjusts resources based on channel environment changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LBT technology is adopted to avoid interference on unlicensed spectrum, then interference between transmitters is reduced, but transmission delay and resource utilization degradation occur due to frequent LBT operations
Solution Approach 1:
The base station pre-configures multiple time domain resources and spatial parameter sets for UE before actual transmission. This preliminary configuration enables UE to perform autonomous uplink transmission without frequent LBT operations, as the resources are already prepared and allocated in advance, thus reducing transmission delay while maintaining interference avoidance through pre-planned resource distribution
Solution Approach 2:
UE performs autonomous uplink transmission independently using pre-configured resources without requiring continuous base station scheduling or repeated LBT procedures. The UE self-manages transmission by selecting appropriate time domain resources and spatial parameter sets from the pre-configured options, eliminating the need for frequent LBT operations and reducing transmission delay
2Productivity
If multiple UEs share the same unlicensed spectrum resource to improve resource utilization, then spectrum efficiency is improved, but inter-user interference increases
Solution Approach 1:
The unlicensed spectrum resource is segmented into multiple time domain resources and spatial parameter sets. Different UEs are assigned to different segments (time resources or spatial beams), allowing multiple UEs to share the spectrum simultaneously while maintaining isolation between them. This segmentation enables high resource utilization while preventing inter-user interference through spatial and temporal separation
Solution Approach 2:
The patent introduces spatial dimension through beamforming by associating different spatial parameter sets with different time domain resources. UEs can be separated not only in time but also in spatial direction using different beams. This dimensional expansion allows multiple UEs to share the same frequency resource without interference by transmitting in different spatial directions
3Object-generated harmful factors
If different time domain resources are allocated to different UEs to reduce interference, then inter-user interference is reduced, but resource utilization decreases
Solution Approach 1:
The patent merges time domain resource allocation with spatial parameter set association. Multiple time domain resources are combined with multiple spatial parameter sets to create a unified resource pool. Different UEs can be allocated different combinations of time resources and spatial beams, allowing the system to reduce interference through spatial separation while maintaining high resource utilization through temporal sharing of the same frequency resources
Data Source
AI summary
The present disclosure provides a method and device for wireless communication in a user equipment and a base station. The user equipment receives a first information, and transmits a first wireless signal in a first time domain resource of a first sub-band. The first information is used to indicate a first parameter; the first parameter is associated with one of L spatial parameter sets; the L spatial parameter sets are respectively in one-to-one corresponding to L time domain resources; the first time domain resource is one of the L time domain resources. The L time domain resources belong to a first time window; the first information is used to determine the first time domain resource from the L time domain resources; the first parameter is used to determine a transmitting antenna port group of the first wireless signal.