Control Channel Resource Allocation for Wireless Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communication systems, the increased complexity of channel estimation for terminal-specific reference signals leads to longer channel reception times and decreased data channel demodulation efficiency, degrading terminal performance.
Innovation Solution
A resource allocation method that supports both diversity and localized transmission modes for control channel transmission using Distributed enhanced Resource Element Groups (DeREGs) and Localized enhanced Control Channel Elements (LeCCEs), allowing channel estimation with dedicated reference signals regardless of transmission mode, and multiplexing different transmission modes into one resource region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminal-specific reference signals are used for control channel transmission in various transmission schemes, then the control channel can be transmitted through terminal-specific reference signals, but the terminal must support various transmission modes for performing channel estimation and control channel multiplexing, which increases reception complexity and channel reception time
Solution Approach 1:
The patent applies universality by designing a single channel estimator that can handle multiple transmission modes (distributed and localized) through a unified resource allocation scheme. The DeREG and LeCCE structures allow the same estimation mechanism to work across different transmission schemes, making the terminal support various modes without proportionally increasing complexity.
Solution Approach 2:
The patent changes the resource allocation parameters by defining DeREGs with specific resource element patterns and LeCCE aggregation levels. By parameterizing the resource structure rather than creating separate processing paths for each transmission mode, the system achieves multi-mode support while controlling terminal complexity through configurable parameters rather than fixed complex hardware.
2Adaptability or versatility
If multiple transmission modes are supported for channel estimation, then the control channel reception flexibility is improved, but the channel reception time increases and data channel demodulation time decreases
Solution Approach 1:
The patent segments the control channel resources into DeREGs (Distributed enhanced Resource Element Groups) and LeCCEs (Localized enhanced Control Channel Elements) with defined structures. This segmentation allows the channel estimator to process different transmission modes through standardized unit structures, reducing the overall processing time compared to handling each mode separately without segmentation.
Solution Approach 2:
The patent performs preliminary resource allocation and mapping by pre-defining DeREG resource patterns and LeCCE aggregation structures. This preliminary configuration enables the terminal to quickly switch between transmission modes without performing complex setup procedures at runtime, thereby reducing channel reception time while maintaining multi-mode flexibility.
3Ease of operation
If different transmission modes are multiplexed in separate resource regions, then each mode can be processed independently, but the resource efficiency decreases
Solution Approach 1:
The patent merges distributed and localized transmission modes into the same resource region by defining DeREGs and LeCCEs that can coexist in overlapping or adjacent resource blocks. The unified resource allocation scheme allows both transmission modes to share the same time-frequency resources, improving resource efficiency while maintaining independent processing capabilities through distinct resource element patterns and mapping rules.
Data Source
AI summary
A method and an apparatus for configuring a control channel in a communication system, according to the present invention, allocate resources of different sizes according to a distributed transmission mode and a localized transmission mode and apply different antenna transmission techniques, to a control channel on the basis of frequency division. In addition, the present invention relates to a method by which a terminal estimates a channel irrespective of the transmission mode. According to the present invention, a control channel transmitted to different terminals from a base station can be efficiently multiplexed and the control channel be received faster by reducing the complexity of the terminal.