Adaptive CCE Configuration for Downlink Control Information
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving downlink control information, particularly in dynamic channel environments where the number of resource elements available for downlink transmission is not fixed, leading to ambiguity in configuring control channel resources.
Innovation Solution
A method and apparatus for adaptively configuring control channel elements (CCEs) based on network signaling, allowing for flexible determination of resource element groups (REGs) and resource elements (REs) per REG, enabling blind detection of downlink control information through multiple control channel candidates, and optimizing CCE configuration according to the size of downlink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of resource elements available for downlink transmission is made variable to adapt to dynamic channel environments, then adaptability is improved, but configuration ambiguity increases
Solution Approach 1:
The base station performs preliminary configuration by signaling the UE about the number of REGs per CCE and the mapping relationship between CCEs and REGs before the actual control information transmission. This preliminary setup eliminates configuration ambiguity during the blind detection process.
Solution Approach 2:
The patent introduces configuration information as an intermediary element that mediates between the variable resource element structure and the UE's blind detection process. This configuration information acts as a bridge that resolves the ambiguity caused by variable REG counts.
2Productivity
If flexible configuration of CCEs and REGs is implemented, then resource usage efficiency is improved, but system complexity increases
Solution Approach 1:
The system implements dynamic configuration where the number of REGs per CCE can be flexibly adjusted based on channel conditions and control information size. The UE dynamically determines the correct REG count based on base station signaling, enabling efficient resource usage without requiring complex manual configuration.
Solution Approach 2:
The patent changes the parameter of REG count per CCE from fixed to variable based on actual transmission needs. By allowing the number of REGs to change dynamically while maintaining structured configuration through signaling, the system achieves efficient resource utilization without excessive complexity.
3Reliability
If blind detection through multiple control channel candidates is performed, then reliability is improved, but detection time increases
Solution Approach 1:
The base station performs preliminary configuration signaling to the UE about the expected structure of control channel candidates before the actual detection process. This preliminary information guides the UE's blind detection, reducing the search space and time while maintaining reliability through multiple candidates.
Solution Approach 2:
The system implements partial blind detection by having the UE check multiple control channel candidates based on configured parameters rather than exhaustively checking all possible configurations. This partial action approach maintains sufficient reliability while significantly reducing detection time.
Data Source
AI summary
A method for receiving downlink control information by a terminal in a wireless communication system may include receiving control channel element (CCE) configuration information from a base station; determining multiple control channel candidates, each of which has one or more CCEs, on the basis of the CCE configuration information; and blind-detecting downlink control information through the multiple control channel candidates, wherein: each of the one or more CCEs includes multiple resource element groups (REGs), and the number of data resource elements (REs) for carrying the downlink control information is independently determined for each REG; and the CCE configuration information indicates whether each CCE has a fixed number of REGs or a fixed number of data REs. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.