EPDCCH Antenna Port Configuration for Interference Management
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Solution Overview
Problem
Current LTE technology faces challenges in efficiently managing relay station activity states and optimizing antenna port configurations for enhanced physical downlink control channels, which affects communication efficiency and interference coordination across multiple user equipment.
Innovation Solution
The method involves mapping reference signals on shared resource elements between different user equipment, using the same antenna ports for EPDCCH, and employing cell identification for descrambling and demodulation, allowing for orthogonal operation and improved interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference signals are mapped to the same antenna ports for multiple EPDCCH transmissions to different UEs, then resource utilization is improved, but interference management becomes more difficult
Solution Approach 1:
The patent segments the reference signal resources by assigning different resource element sets to different UEs monitoring the same antenna ports. This segmentation allows multiple UEs to share antenna ports while maintaining orthogonal resource allocation, thus improving resource utilization without causing interference between UEs.
2Adaptability or versatility
If cell ID is used for descrambling reference signals, then UE-specific signal processing is enabled, but system complexity increases
Solution Approach 1:
The patent enables UEs to self-configure their descrambling parameters by using their own cell ID or UE-specific parameters. Each UE independently generates the appropriate scrambling sequence for its reference signals, eliminating the need for centralized configuration and reducing system complexity while maintaining UE-specific processing capabilities.
3Productivity
If multiple UEs share the same resource elements for EPDCCH, then spectral efficiency is improved, but orthogonality maintenance becomes challenging
Solution Approach 1:
The patent resolves orthogonality conflicts by introducing additional dimensions for resource differentiation beyond simple resource element allocation. By using combinations of resource element sets, antenna port indices, and scrambling sequences, the system maintains orthogonality in multiple dimensions simultaneously, allowing multiple UEs to share the same time-frequency resources without interference.
Data Source
AI summary
A method of wireless communication is provided which includes receiving, at a first user equipment (UE), a first reference signal on a first set of resource elements of a first enhanced physical downlink control channel (EPDCCH). The first reference signal is mapped to a same set of antenna ports that are mapped to a second reference signal transmitted on a second set of resource elements of a second EPDCCH to at least a second UE. Furthermore, the first set of resource elements and the second set of resource elements have been selected from shared resource elements. The first set of resource elements differ from the second set of resource elements. The method also includes descrambling the received first reference signal based at least in part on a cell identification (ID) and demodulating a signal based at least in part on the descrambled first reference signal.