Enhanced Control Channel Antenna Port Mapping for LTE
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Solution Overview
Problem
Current LTE systems face challenges in improving channel estimation performance, particularly in new carrier types without common reference signals, leading to degraded performance and interference issues.
Innovation Solution
The implementation of an enhanced control channel (eCCH) distributed over multiple resource block pairs, where each resource is associated with a respective antenna port, allowing the user equipment to determine and use the same antenna port across different resource block pairs for improved channel estimation, and combining channel estimates from different time instances for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If common reference signals are used for channel estimation in LTE systems, then channel estimation performance is improved, but new carrier types without common reference signals experience degraded performance and interference issues
Solution Approach 1:
The patent creates virtual reference signals by copying and reconstructing channel information from multiple antenna ports. The network node transmits reference signals from multiple antenna ports and the user equipment combines these to form virtual common reference signals, effectively copying the functionality of traditional CRS without requiring actual CRS transmission in new carrier types.
Solution Approach 2:
The patent enables a universal channel estimation mechanism that works across both legacy LTE systems with CRS and new carrier types without CRS. By using multiple antenna ports to generate virtual reference signals, the system achieves multi-functionality that adapts to different carrier types while maintaining consistent channel estimation performance.
2Productivity
If eCCH is distributed over multiple resource block pairs with different antenna ports, then resource utilization is improved, but channel estimation complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the network node receives channel state information from the user equipment and adjusts the antenna port assignments and resource block pair allocations accordingly. This feedback loop enables the system to optimize the distribution of eCCH across resource blocks while managing the complexity of channel estimation through adaptive configuration.
Solution Approach 2:
The patent employs dynamic antenna port selection and resource block pair assignment for eCCH distribution. The network node can dynamically adjust which antenna ports are used in which resource block pairs based on channel conditions, user equipment capabilities, and interference levels, thereby optimizing resource utilization while adapting the complexity of channel estimation to current system conditions.
3Object-affected harmful factors
If multiple antenna ports are used for eCCH transmission, then interference resistance is improved, but signal processing complexity increases
Solution Approach 1:
The patent merges channel estimation results from multiple antenna ports to create a combined channel estimate. The user equipment receives reference signals from multiple antenna ports and combines these measurements to form a unified channel state representation, which improves interference resistance through diversity while consolidating the processing into a unified algorithm that manages complexity.
Data Source
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AI summary
A method in a user equipment for estimating a channel upon receiving an enhanced control channel, eCCH, from a network node in a telecommunications system. The eCCH is distributed over multiple resource block pairs, wherein each of the multiple resource block pairs comprises a number of resources. Each resource is associated with a respective antenna port. The user equipment identifies an antenna port being associated with more than one resource. The more than one resource is present in different resource block pairs of the multiple resource block pairs over which the eCCH is distributed. The identifying is based on how the eCCH is mapped to the multiple resource block pairs. Also, the user equipment estimates the downlink channel for the eCCH based on the identified antenna port in the more than one resource in the multiple resource block pairs. A user equipment, a method in network node and a network node are also provided.