CSI-RS Resource Location Determination in Wireless Frames
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Solution Overview
Problem
User equipment in wireless communication systems face challenges in accurately receiving Channel State Information-Reference Signals (CSI-RS) transmitted from different resource locations, especially when subframes are of varying types within a wireless frame, leading to ambiguity in CSI-RS resource location determination.
Innovation Solution
A method and apparatus for receiving CSI-RS resource information, which includes an index value indicating the location of CSI-RS resource elements, period, and offset information of subframes, allowing CSI-RS transmission alternately through normal and special subframes, with the location determined considering the subframe type, and CSI-RS being transmitted only in special subframes of a predetermined length or greater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSI-RS is transmitted alternately through normal and special subframes, then resource utilization is improved, but ambiguity in CSI-RS resource location determination occurs
Solution Approach 1:
The patent applies local quality by configuring different CSI-RS resource locations based on subframe type. Specifically, when the subframe type indicates a normal subframe, the CSI-RS resource location is set to a first location, and when it indicates a special subframe, the location is set to a second location. This allows the system to optimize resource utilization across different subframe types while maintaining unambiguous location determination through type-specific configuration.
2Device complexity
If CSI-RS resource location is determined using a single index value, then signaling complexity is reduced, but ambiguity arises when subframe types vary
Solution Approach 1:
The patent implements dynamics by making the CSI-RS resource location adaptive to subframe type while maintaining a single index value for signaling. The system dynamically selects between a first CSI-RS resource location for normal subframes and a second location for special subframes based on the subframe type indication. This dynamic adaptation ensures reliable CSI-RS reception across varying subframe types without increasing signaling complexity, as the single index value suffices to identify the appropriate location given the known subframe type.
3Adaptability or versatility
If CSI-RS is transmitted in special subframes of varying lengths, then transmission flexibility is improved, but measurement accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring specific CSI-RS resource locations for special subframes with sufficient length. The system determines in advance that special subframes must have a length greater than or equal to a threshold value to accommodate CSI-RS transmission. By pre-establishing these location configurations and filtering out insufficient subframes, the system maintains measurement accuracy while preserving transmission flexibility for appropriately sized special subframes.
Data Source
AI summary
Disclosed herein is a method of receiving a channel state information-reference signal (CSI-RS) of a user equipment (UE) in a wireless communication system, including receiving CSI-RS resource information about a CSI-RS resource location having the CSI-RS mapped thereto, from a base station and receiving the CSI-RS through a CSI-RS resource at a location determined based on the CSI-RS resource information, wherein the CSI-RS resource information includes an index value indicating a location of a CSI-RS resource element where the CSI-RS is transmitted, a period and offset information of a subframe where the CSI-RS is transmitted, and information on a number of antenna ports where the CSI-RS is transmitted, wherein when the index value indicates locations of different CSI-RS resource elements by types of the subframe where the CSI-RS is transmitted and the CSI-RS is set to be transmitted alternately through a normal subframe and a special subframe within one wireless frame, the location of the CSI-RS resource is determined in additional consideration of a type of the subframe in addition to the CSI-RS resource information.