Grant-Free Uplink Spatial Parameter Grouping for Interference Reduction
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Solution Overview
Problem
The existing grant-free uplink transmission schemes in wireless communication systems, particularly in massive MIMO environments, face inefficiencies in utilizing pre-configured air interface resources, leading to suboptimal spectral efficiency and increased interference among user equipment.
Innovation Solution
The method involves user equipment determining spatial parameter groups and multiple access signatures to transmit wireless signals on pre-configured time-frequency resource sets, orthogonal to initial resource sets, thereby reducing interference and enhancing resource utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-free uplink transmission is used to reduce signaling overhead, then spectral efficiency is improved, but interference among user equipment increases
Solution Approach 1:
The patent segments the time-frequency resources into multiple orthogonal resource sets, and further segments each resource set into multiple spatial parameter groups. This segmentation allows multiple users to be assigned to different segments, reducing interference while maintaining grant-free transmission efficiency.
Solution Approach 2:
The patent introduces spatial parameters (beam directions, antenna ports) as an additional dimension for resource differentiation. By combining time-frequency resources with spatial parameters, the system creates orthogonal resource sets that are distinguishable in multiple dimensions, thereby reducing interference among users.
2Device complexity
If pre-configured air interface resources are used for grant-free transmission, then signaling overhead is reduced, but resource utilization efficiency becomes suboptimal
Solution Approach 1:
The patent dynamically determines which spatial parameter group and multiple access signature to use based on the specific time-frequency resource set and user requirements. This dynamic selection allows the system to optimize resource utilization for each transmission instance while maintaining the simplicity of grant-free operation.
Solution Approach 2:
The patent changes parameters such as spatial parameter groups and multiple access signatures to optimize resource utilization. By varying these parameters across different resource sets and transmission instances, the system achieves efficient resource usage without requiring complex signaling.
3Power
If multiple access signatures are used to enhance transmission rate, then system capacity is improved, but complexity in determining optimal resources increases
Solution Approach 1:
The patent pre-configures multiple access signatures and spatial parameter groups associated with different time-frequency resource sets before transmission occurs. This preliminary configuration eliminates the need for real-time determination of optimal resources, as users can directly use the pre-assigned combinations based on their transmission needs.
Data Source
AI summary
A method and device for wireless communication in a UE and a base station is disclosed. The user equipment receives a first bit block, transmits or receives a first wireless signal on a first time-frequency resource set, and transmits a second wireless signal on a second time-frequency resource set. The user equipment determines to transmit the second wireless signal on the second time-frequency resource set. A second bit field in the first bit block is used to indicate the first time-frequency resource set. A first bit field in the first bit block is used to simultaneously indicate a first spatial parameter group for transmitting the first wireless signal and a second spatial parameter group for transmitting the second wireless signal or a first multiple access signature for generating the second wireless signal. The spatial parameter group information used for scheduling PDSCH or PUSCH is applied to the uplink grant-free transmission.