Dynamic E-CCE Allocation for TDD Downlink Control Channels
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Solution Overview
Problem
Current wireless communication systems, such as 3GPP LTE, face challenges in efficiently allocating resources for downlink control channels, particularly in managing the number of E-CCEs and E-REGs within a PRB pair, which affects channel estimation and interference coordination.
Innovation Solution
A method to dynamically determine the number of E-CCEs and E-REGs per PRB pair based on subframe configuration and available REs, using a threshold-based approach to ensure efficient resource allocation and channel quality, allowing for flexible configuration of E-PDCCH in both normal and special subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of E-CCEs and E-REGs per PRB pair is fixed, then the structure is simple, but the allocation efficiency and adaptability to different subframe configurations deteriorate
Solution Approach 1:
The patent applies dynamics by making the number of E-CCEs and E-REGs per PRB pair variable rather than fixed. The configuration dynamically adapts based on subframe type (normal or special) and available resource elements, allowing the system to optimize resource allocation for different operational conditions while maintaining manageable complexity through standardized determination rules.
Solution Approach 2:
The patent changes the parameter of E-CCE/E-REG configuration based on subframe characteristics. By determining the number of E-CCEs and E-REGs according to whether the subframe is normal or special and based on available REs, the system optimizes allocation efficiency for different scenarios without requiring complex manual configuration.
2Reliability
If resources are allocated statically, then the structure is simple, but the channel estimation performance and interference coordination deteriorate
Solution Approach 1:
The patent implements dynamic resource allocation where the number of E-CCEs and E-REGs is determined based on real-time subframe configuration and available resource elements. This dynamic approach optimizes channel estimation performance and interference coordination by adapting to current system conditions rather than using static allocation.
Solution Approach 2:
The patent incorporates feedback mechanisms where the eNB determines the number of E-CCEs and E-REGs based on actual available REs in each subframe. This feedback-driven allocation ensures optimal resource utilization for channel estimation and interference management, improving reliability without excessive complexity.
3Productivity
If a fixed configuration of E-CCEs is used, then the implementation is simple, but the resource allocation efficiency deteriorates
Solution Approach 1:
The patent changes the configuration parameters of E-CCEs and E-REGs based on subframe type and available resource elements. This parameter adaptation maximizes resource allocation efficiency by matching the configuration to actual system conditions, while the determination rules remain standardized to avoid excessive implementation complexity.
Solution Approach 2:
The patent makes the E-CCE/E-REG configuration dynamic, allowing the number of elements to vary based on subframe characteristics. This dynamic configuration optimizes productivity by ensuring efficient resource utilization in both normal and special subframes, with complexity managed through systematic determination procedures.
Data Source
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AI summary
Disclosed is a method for a base station to transmit a downlink control channel to a terminal in a time division duplex (TDD)-based wireless communication system. Specifically, the method comprises the steps of: determining the number of basic resource allocation units for each resource block pair for a downlink control channel on the basis of the type of a sub-frame during which the downlink control channel is transmitted; mapping, by basic resource allocation unit, control information for the terminal to a transmission resource; and transmitting, to the terminal, the downlink control channel comprising the control information, wherein, if the type of the sub-frame, during which the downlink control channel is transmitted, is the type in which a downlink transmission interval and a uplink transmission interval coexist, then the number of basic resource allocation unit for each resource block pair is determined on the basis of the length of the downlink transmission interval.