Interference Removal via Segmented RSRP Measurement Sets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 3GPP LTE systems, the inability of user equipment (UE) to accurately measure reference signal received power (RSRP) from Remote Radio Heads (RRHs) in neighbor cells due to their non-transmission of Cell-specific Reference Signals (CRS) in Cooperative Multi-point (CoMP) environments leads to interference issues, as the UE cannot differentiate between macro eNodeB and RRH interference, affecting signal quality and interference coordination.
Innovation Solution
The method involves configuring multiple RSRP measurement sets to allow UE to perform measurements on different subframes, receiving information from a serving cell, and reporting results to identify and mitigate interference from both macro eNodeB and RRH, using bitmap formats for signaling and processor-controlled RF units to manage interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If RRH does not transmit CRS in CoMP environment, then interference from RRH is reduced, but UE cannot accurately measure RSRP for interference identification
Solution Approach 1:
The patent segments the measurement process into two distinct measurement sets: one for measuring CRS from macro eNodeB and another for measuring CRS from RRH. This segmentation allows the UE to separately identify and measure interference sources, resolving the contradiction by enabling accurate RSRP measurement while maintaining the CoMP interference reduction strategy.
Solution Approach 2:
The patent introduces measurement set configuration information as an intermediary mechanism. The serving cell provides the UE with configuration information indicating different measurement sets, which act as intermediaries to guide the UE in performing differentiated measurements on CRS from different sources (macro eNodeB vs. RRH), thereby enabling accurate interference identification without requiring RRH to transmit CRS continuously.
2Measurement precision
If multiple measurement sets are configured, then interference identification accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent changes the parameter of measurement configuration by introducing measurement set indicators (such as bitmap patterns) that efficiently represent multiple measurement configurations. Instead of separate detailed configurations for each measurement type, the system uses compact parameter representations that reduce signaling overhead while maintaining the ability to perform multiple differentiated measurements for accurate interference identification.
Data Source
AI summary
An aspect of the present disclosure provides a method of removing interference at a terminal. The method may include the steps of: receiving information on a plurality of measurement sets for an interfering cell from a serving cell; performing a first measurement on a subframe indicated by a first measurement set from a plurality of measurement sets based on a cell-specific reference signal (CRS) received from a remote radio head (RRH) and a macro base station in the interfering cell; and performing a second measurement on a subframe indicated by a second set of measurements based on a CRS received from the macro base station in the interfering cell; and reporting a result of the first measurement and a result of the second measurement to the serving cell.