E-PDCCH DMRS Mapping for Wireless Control Channel Efficiency
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Solution Overview
Problem
The existing wireless communication systems face challenges in efficiently transmitting control channels due to resource shortages and interference issues, particularly in high mobility scenarios, where the PDCCH resource is insufficient for multiple user MIMO transmissions, leading to reduced reliability and throughput.
Innovation Solution
The method involves implicitly configuring Demodulation Reference Signal (DMRS) information for Enhanced Physical Data Control Channel (E-PDCCH) transmission, optimizing the association between E-PDCCH and DMRS ports, and dynamically adjusting transmit power to enhance resource utilization and interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCCH resources are increased to support multiple user MIMO transmissions, then system throughput improves, but control region resource shortage worsens
Solution Approach 1:
The patent transitions from traditional PDCCH transmission in the control region to E-PDCCH transmission in the data region, utilizing the frequency domain resource allocation flexibility. By mapping E-PDCCH to resource blocks in the data region rather than consuming control region symbols, the system achieves additional transmission capacity without worsening control region resource shortage.
Solution Approach 2:
The patent segments the control channel transmission into two parts: traditional PDCCH for basic control information and E-PDCCH for enhanced control information with MIMO support. This segmentation allows the system to handle multiple users with different transmission requirements simultaneously, improving overall system throughput while maintaining control region efficiency.
2Reliability
If DMRS configuration information is explicitly signaled, then transmission reliability improves, but control channel overhead increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine DMRS configuration information through implicit rules based on E-PDCCH aggregation level and resource block mapping. Instead of requiring explicit signaling from the eNB, the UE uses predefined association rules to infer the correct DMRS ports and configuration, thereby eliminating overhead while maintaining reliable transmission.
Solution Approach 2:
Instead of the eNB signaling DMRS configuration to the UE (top-down approach), the patent inverts the logic by establishing rules where the UE determines the configuration based on observed E-PDCCH characteristics (bottom-up approach). This inversion eliminates the need for explicit configuration signaling while ensuring reliable DMRS-based transmission.
3Reliability
If E-PDCCH aggregation level is increased to improve coverage, then reception reliability improves, but resource utilization efficiency decreases
Solution Approach 1:
The patent dynamically adjusts the E-PDCCH aggregation level based on the specific transmission scenario and UE requirements. Rather than using a fixed aggregation level, the system adapts the aggregation level to match the MIMO transmission configuration, ensuring optimal resource utilization efficiency while maintaining reception reliability for different coverage scenarios.
Data Source
AI summary
A control channel transmission/reception method and apparatus is provided. The base station of the present invention transmits configuration information on a control channel to a terminal, checks an aggregation level for use in transmitting the control channel, maps Demodulation Reference Signal (DMRS) to resource elements in a resource block depending on the aggregation level, determines, when the resource elements of the DMRS correspond to a first resource element set, whether to map the DMRS to resource elements corresponding to a second resource element set in the resource block, and transmits the DMRS and control channel to the terminal according to the determination result.