Puncturing UE Specific Reference Signals in New Carrier Type
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Solution Overview
Problem
In wireless access systems supporting a new carrier type (NCT), there is a challenge in efficiently transmitting data and puncturing UE specific reference signals when they overlap with synchronization signals, which affects downlink channel estimation performance.
Innovation Solution
The method involves allocating specific resource elements for synchronization signals and UE specific reference signals, puncturing overlapping resource elements, and managing second cells to provide synchronization for the first cell, with the synchronization signal allocated using odd-numbered resource blocks, allowing for efficient data transmission and improved channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE specific reference signals are transmitted in overlapping frequency resources with synchronization signals, then resource utilization is improved, but downlink channel estimation performance deteriorates
Solution Approach 1:
The patent extracts and removes the conflicting UE specific reference signal from the overlapping frequency resource where the synchronization signal is transmitted. This is achieved by puncturing the UE-RS in the specific resource elements that overlap with the synchronization signal, thereby eliminating the interference while maintaining efficient resource utilization in non-overlapping regions
Solution Approach 2:
The patent introduces a puncturing mechanism as an intermediary process that selectively removes conflicting reference signal elements. This mediator allows the system to maintain both synchronization signal transmission and UE-RS transmission in the same subframe, but prevents their harmful interaction by removing only the overlapping portions
2Measurement precision
If synchronization signal is transmitted frequently, then synchronization accuracy is improved, but resource consumption increases
Solution Approach 1:
The patent implements periodic transmission of synchronization signals at specific intervals (e.g., every 5ms or 10ms) rather than continuous transmission. This periodic action maintains synchronization accuracy by providing regular updates while significantly reducing resource consumption compared to continuous transmission
Solution Approach 2:
The patent performs preliminary allocation of specific resource elements for synchronization signals before allocating resources for data and reference signals. This preliminary action ensures that synchronization resources are reserved in advance, preventing conflicts and enabling efficient resource utilization without over-provisioning
3Measurement precision
If UE specific reference signals are punctured in overlapping regions, then channel estimation performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the frequency resources into distinct regions: synchronization signal regions, UE-RS regions, and data regions. By segmenting the resource allocation and applying puncturing only to specific overlapping segments, the system maintains channel estimation performance while managing device complexity through structured resource organization
Solution Approach 2:
The patent applies puncturing selectively only to the local region where UE-RS and synchronization signals overlap, rather than uniformly across the entire bandwidth. This local application of the puncturing operation maintains channel estimation performance in critical overlapping regions while minimizing the impact on overall system complexity and resource utilization
Data Source
AI summary
The present invention relates to methods for performing a radio resource measurement in a synchronized cell when a similar co-location is applied and apparatuses for supporting the same. As an embodiment of the present invention, a method in which a user equipment (UE) performs a radio resource measurement (RRM) in a radio access system may comprise the steps of: receiving a higher layer signal including similar co-location (QCL) information of a channel state information reference signal (CSI-RS) of a first cell and a cell specific reference signal (CRS) and/or a CSI-RS of a second cell; receiving the CRS and/or the CSI-RS of the second cell on the basis of the QCL information; and measuring a first RRM of the first cell by using the CRS and/or the CSI-RS of the second cell.