1-Port CSI-RS Resource Mapping for Wireless Communication Overhead Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The conventional LTE-A standard's CSI-RS resource configuration, particularly in 1-port CSI-RS transmission, results in excessive overhead and decreased transmission efficiency due to higher resource density, and the ZP CSI-RS scheme's inefficiency in designating resources, which affects PDSCH transmission efficiency.
Innovation Solution
Dynamic transmission of Zero-Power (ZP) Reference Signal (RS) or Interference Measurement Resource (IMR) information from the base station to user equipment, with resources being frequency-multiplexed, and utilizing 1-antenna port CSI-RS with one resource element per antenna port to reduce overhead and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 1-port CSI-RS transmission is used with conventional LTE standard resource configuration, then beam selection-based precoding can be supported, but resource density doubles to 2 REs per AP per RB causing excessive overhead and decreased transmission efficiency
Solution Approach 1:
The patent changes the resource element mapping parameters for 1-port CSI-RS transmission. Specifically, it maps the single antenna port to only one resource element per resource block instead of two, effectively halving the resource density from 2 REs/AP/RB to 1 RE/AP/RB. This parameter change maintains support for beam selection-based precoding while eliminating the excessive overhead that reduced transmission efficiency.
2Measurement precision
If ZP CSI-RS resources are designated using conventional 4-port CSI-RS configuration, then high accurate CSI estimation can be achieved, but excessive ZP CSI-RS resources are designated causing PDSCH transmission efficiency to decrease
Solution Approach 1:
The patent changes the resource configuration parameters for ZP CSI-RS by utilizing the optimized 1-port CSI-RS resource element mapping. This allows ZP CSI-RS resources to be designated more precisely with fewer resource elements, achieving the required CSI estimation accuracy while minimizing the number of muted resources. Consequently, more resource elements remain available for PDSCH transmission, improving PDSCH transmission efficiency.
Data Source
AI summary
A wireless communication method includes transmitting, from a base station (BS) to a user equipment (UE), a configuration information indicating a resource used in transmission of a Channel State Information-Reference Signal (CSI-RS) by higher layer signaling; and receiving, with the UE, the CSI-RS from the BS based on the configuration information. The configuration information indicates a mapping for CSI-RS transmission using a single antenna port (AP) to a single resource element per a resource block. In other aspects, a UE, a BS, and a system are also disclosed.