Demodulation Pilot Sequence Configuration for E-PDCCH
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In CoMP technology, user equipment (UE) faces difficulties in obtaining demodulation reference signals (DMRS) for demodulating the enhanced-physical downlink control channel (E-PDCCH), which is essential for scheduling indication information, due to the existing method's inability to effectively separate and demodulate the E-PDCCH from the physical downlink shared channel (PDSCH).
Innovation Solution
The method involves configuring and transmitting demodulation pilot sequences by partitioning resource sets into first and second resource sets, with specific parameters for each, allowing the UE to generate and obtain initial values of demodulation pilot sequences for demodulating the E-PDCCH, thereby improving demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If E-PDCCH multiplexes PDSCH resource using FDM, then time-frequency resource sharing is achieved, but UE cannot obtain DMRS for demodulating E-PDCCH
Solution Approach 1:
The patent segments the resource set into first resource set and second resource set, with each set having independent DMRS parameters. This segmentation allows separate DMRS configuration for E-PDCCH and PDSCH, resolving the conflict between resource sharing and demodulation capability.
Solution Approach 2:
The patent applies local quality by configuring different DMRS parameters (scrambling code ID, initial ID) for different resource sets. The first resource set uses first DMRS parameters while the second resource set uses second DMRS parameters, enabling localized optimization for each channel type.
2Device complexity
If same DMRS parameters are used for E-PDCCH and PDSCH, then configuration simplicity is maintained, but demodulation performance deteriorates due to resource collision
Solution Approach 1:
The patent divides the resource set into distinct first and second resource sets with separate DMRS parameter configurations. This segmentation prevents parameter collision between E-PDCCH and PDSCH while maintaining manageable configuration complexity through systematic parameter assignment.
Solution Approach 2:
Different DMRS parameters are assigned to different resource sets based on their specific requirements. The first resource set (for E-PDCCH) uses first DMRS parameters while the second resource set (for PDSCH) uses second DMRS parameters, optimizing channel estimation for each channel type locally.
Data Source
AI summary
A method and an apparatus for obtaining a pilot is disclosed. The method includes: generating a first initial value of a first demodulation pilot sequence based on a first parameter set, and generating a second initial value of a second demodulation pilot sequence according to a second parameter set, wherein the first parameter set is determined based on a first resource set corresponding to a first downlink control information (DCI) format set, and the second parameter set is determined based on a second resource set corresponding to a second DCI format set; and obtaining the first demodulation pilot sequence based on the first initial value, and obtaining the second demodulation pilot sequence based on the second initial value. The method can be performed by a UE (user equipment) or a base station.