Uplink Precoder Control for Eight-Port Wireless Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication standards inhibit efficient UL transmission with more than four antenna ports due to unified designs that may increase bit size of downlink control information, suppressing communication throughput.
Innovation Solution
A terminal and base station design that includes a receiving section for downlink control information and a control section to judge precoders for up to eight layers, allowing a unified configuration for up to four and up to eight layers, enabling appropriate control of UL transmission with more than four antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified design is used for precoding matrix table and downlink control information notification, then design simplicity is improved, but bit size of downlink control information increases, suppressing communication throughput
Solution Approach 1:
The patent segments the precoding matrix table into different tables based on the number of antenna ports (four-antenna-port table and eight-antenna-port table). This segmentation allows the downlink control information to only include necessary bits for indicating the precoder, without requiring a unified design that would increase bit size. By dividing the codebook into separate tables, the system maintains design simplicity while avoiding the overhead penalty of a unified approach.
Solution Approach 2:
The patent applies local quality by configuring different codebook subsets with different qualities (four-antenna-port and eight-antenna-port) according to the specific transmission requirements. This allows the system to use appropriate precoding matrices tailored to each antenna port configuration, optimizing performance for each local scenario rather than using a single unified codebook for all cases.
2Ease of manufacture
If a unified design is used for precoding matrix table, then implementation simplicity is improved, but individual preferable configurations for precoding matrix are inhibited
Solution Approach 1:
The patent segments the codebook into multiple tables (four-antenna-port table and eight-antenna-port table) with different precoding configurations. This segmentation enables the system to implement individual preferable configurations for different antenna port scenarios while maintaining implementation simplicity through standardized table structures. Each table can be implemented independently using existing processing circuits.
Solution Approach 2:
The patent introduces dynamic configuration where the base station can switch between different codebook tables (four-antenna-port and eight-antenna-port) based on transmission requirements. This dynamic approach allows the system to adapt to different transmission scenarios while maintaining a relatively simple implementation structure, as the switching mechanism builds upon existing codebook indication frameworks.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives downlink control information including information related to a codebook subset indicating a precoder for up to four layers and a precoder for up to eight layers; and a control section that judges, based on the precoder indicated by the information, a precoder for eight ports for an uplink transmission, wherein a configuration is indicated in common for a configuration for the up to four layers and a configuration for the up to eight layers. An aspect of the present disclosure enables UL transmission using more than four antenna ports to be appropriately controlled.