Variable Fixed CCE Allocation for SCCH Detection
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Solution Overview
Problem
In Orthogonal Frequency Division Multiple Access (OFDMA) systems, receivers face challenges in accurately detecting Shared Control Channels (SCCH) due to variable CCE allocation, leading to increased blind detection complexity and time, especially for Discontinuous Reception (DRx) UEs and UEs receiving System Information (SI), which affects efficient resource utilization and packet data transmission.
Innovation Solution
The method involves distinguishing between variable and fixed Control Channel Elements (CCEs) based on UE type, with DRx UEs receiving SCCH through fixed CCEs and normal UEs through variable CCEs, and providing subset information for SCCH establishment to reduce blind detection and improve reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable CCE allocation is used for SCCH transmission, then resource utilization efficiency is improved, but blind detection complexity and time increase for receivers
Solution Approach 1:
The patent divides CCEs into two distinct groups: fixed CCEs (first group) and variable CCEs (second group). Fixed CCEs are always used for SCCH transmission to ensure reliable reception, while variable CCEs are used for data channel transmission to improve resource utilization. This segmentation allows receivers to separately handle fixed and variable CCEs, reducing blind detection complexity while maintaining efficient resource usage.
2Productivity
If variable CCE allocation is used for SCCH transmission, then resource utilization efficiency is improved, but detection time increases for DRx UEs and SI receiving UEs
Solution Approach 1:
The patent pre-allocates fixed CCEs that are exclusively designated for SCCH transmission. Receivers, particularly DRx UEs and SI receiving UEs, can directly monitor these predetermined fixed CCEs without needing to perform blind detection across variable CCEs. This preliminary allocation of fixed resources significantly reduces detection time while the variable CCEs continue to be used for data transmission to maintain resource utilization efficiency.
3Reliability
If fixed CCEs are allocated for SCCH transmission, then detection reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments CCEs into fixed and variable groups. Fixed CCEs are reserved for SCCH transmission to ensure detection reliability, while variable CCEs are dynamically allocated for data channel transmission to improve resource utilization efficiency. This segmentation allows the system to achieve both reliability and efficiency simultaneously by assigning different CCE groups to different functions.
4Reliability
If blind detection is performed across all CCEs, then SCCH reception reliability is improved, but processing complexity and time increase
Solution Approach 1:
The patent extracts fixed CCEs from the total CCE pool and designates them exclusively for SCCH transmission. Receivers only need to perform blind detection on these fixed CCEs rather than searching through all variable CCEs. This extraction of a dedicated subset for control channel transmission maintains SCCH reception reliability while significantly reducing processing complexity and time.
Data Source
AI summary
A method and apparatus for receiving control information in a mobile communication system. A controller acquires information indicating variable Control Channel Elements (CCEs) allocated for first User Equipments (UEs) among CCEs constituting control channels, acquires information indicating fixed CCEs allocated for second UEs, selects the variable CCEs when a UE receiving the control information is included in the first UEs, and selects the fixed CCEs when the UE is included in the second UEs. A control information receiver receives the control information through the selected CCEs.