ePDCCH Reference Signal Multiplexing via eCCE Mapping
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and LTE-A systems, the limited number of antenna ports restricts the transmission of reference signal sequences for channel estimation in enhanced physical downlink control channels (ePDCCH), reducing channel estimation capacity.
Innovation Solution
A method and device that determine the position of enhanced control channel elements (eCCE) or enhanced resource element groups (eREG) mapped to ePDCCH in a resource block pair and establish a corresponding relationship with antenna ports, allowing multiple ePDCCHs to share and multiplex reference signal sequences over available antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of antenna ports is limited, then the system complexity is reduced, but the channel estimation capacity for ePDCCH is reduced
Solution Approach 1:
Multiple ePDCCHs are merged to share the same antenna port for reference signal transmission. Specifically, multiple eCCEs (enhanced control channel elements) or eREGs (enhanced resource element groups) are mapped to a single antenna port, allowing multiple ePDCCHs to use the same reference signal sequence for channel estimation, thereby increasing channel estimation capacity without adding more antenna ports
Solution Approach 2:
Each antenna port is designed to serve multiple ePDCCHs simultaneously. The antenna port becomes a universal resource that can be shared by multiple ePDCCHs through the mapping of multiple eCCEs/eREGs to the same antenna port, enabling one antenna port to perform multiple channel estimation functions for different ePDCCHs
2Quantity of substance
If multiple ePDCCHs share the same antenna port, then the channel estimation capacity is improved, but the signal interference may increase
Solution Approach 1:
The resource block pair is segmented into multiple eCCEs or eREGs, which are then selectively mapped to antenna ports. This segmentation allows for organized allocation where different segments (eCCEs/eREGs) can be mapped to the same antenna port in a structured manner, reducing random interference while maintaining multiplexing benefits
Solution Approach 2:
The problem is solved by introducing a new dimension of resource organization through eCCE/eREG granularity. Instead of treating ePDCCHs as individual entities competing for antenna ports, the system divides ePDCCHs into smaller eCCE/eREG units that can be flexibly mapped to antenna ports, creating an additional resource dimension for interference management
Data Source
AI summary
The present application provides a method and device for transmitting a reference signal sequence. The method includes: determining a position of an eCCE or an eREG mapped to an ePDCCH in a resource block pair; determining, according to corresponding relationship between the position of the eCCE or the eREG in the resource block pair and the antenna port of the reference signal; and transmitting a reference sequence over the antenna port of the reference signal, herein, the corresponding relationship between the position of the eCCE or the eREG in the resource block pair and the antenna port of the reference signal includes that the positions of at least two eCCEs or at least two eREGs correspond to one of the antenna ports of the reference signal.