Scalable Beam Selection Tables for MIMO Latency Reduction
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Solution Overview
Problem
In wireless communication systems, especially those supporting MIMO transmissions, the existing methods for indicating beam selection are inefficient, leading to increased latency and a heavy burden on memory storage due to the need for exhaustive lookup processes and large lookup tables.
Innovation Solution
A scalable process for indicating beam selection is implemented, where user equipment (UE) and base stations use a set of scalable tables to determine and transmit a combination index value, allowing for efficient storage and processing of beam indices, reducing latency and memory burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an exhaustive lookup process is used to indicate selected beams, then beam selection accuracy is improved, but latency increases
Solution Approach 1:
The patent segments the beam indication process into two parts: a type indicator that specifies the beam selection method, and a beam index that identifies the selected beam. This segmentation eliminates the need for exhaustive lookup by allowing the UE to directly indicate beams using the structured format (type indicator + beam index), thereby reducing latency while maintaining accuracy.
Solution Approach 2:
The patent performs preliminary action by pre-defining multiple beam sets with different configurations (e.g., different numbers of beams, different dimensionalities). The type indicator预先 indicates which beam set configuration is selected, so the base station can directly interpret the beam index without performing exhaustive search, thus reducing latency while preserving selection accuracy.
2Adaptability or versatility
If separate lookup tables are stored for different beam configurations, then beam selection flexibility is improved, but memory storage burden increases
Solution Approach 1:
The patent creates a universal beam indication framework that works across multiple configurations using a single structured format. The type indicator field allows the same indication mechanism to support different beam set configurations (different numbers of beams, different dimensionalities), eliminating the need for separate lookup tables for each configuration while maintaining flexibility.
Solution Approach 2:
The patent uses parameter changes in the type indicator to adapt to different beam configurations. By changing the type indicator value, the system can indicate different beam set configurations without changing the underlying indication mechanism or requiring separate storage structures, thus reducing memory burden while preserving adaptability.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. In wireless systems supporting multiple-input, multiple-output (MIMO) transmissions, devices may implement beam-forming to improve reliability of communications. A user equipment (UE) may select a set of beams, and corresponding beam indices, for communication based on reference signals received from a base station. The UE may determine values corresponding to each of the beam indices using a scalable set of tables. For example, the UE may select a subset of the tables based on the number of selected beams, and may determine the values based on these tables. In this way, the UE may efficiently store sets of tables for multiple different configurations. The UE may sum the corresponding values to obtain a combination index value, and may transmit the combination index value to the base station. The base station may determine the selected beams based on this combination index value.