Control Channel Resource Unit Segmentation for Low Overhead Signaling
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Solution Overview
Problem
In LTE and LTE-Advanced wireless communication systems, efficiently indicating and detecting advanced control channels like EPDCCH is challenging due to the need for low overhead signaling while ensuring correct detection by user equipment (UE).
Innovation Solution
The method involves determining a size indicator and combinatorial index for resource units assigned to the control channel, allowing the network to indicate and the UE to detect the control channel using these indices, thereby reducing overhead and ensuring accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If advanced control channels (EPDCCH) are transmitted in more symbols to achieve flexibility and robustness, then the control channel performance is improved, but the signaling overhead increases
Solution Approach 1:
The control channel resources are segmented into multiple resource units (RUs), where each RU consists of one or more resource blocks. The eNB divides the total control channel resources into N RUs and indicates to the UE which specific RUs are allocated for EPDCCH transmission. This segmentation allows efficient resource utilization while reducing the overall signaling overhead by only indicating the necessary RUs rather than describing each resource block individually.
Solution Approach 2:
The patent introduces a two-dimensional indication mechanism: (1) a size indicator specifying the number of resource units N, and (2) a combinatorial index indicating which specific RUs are allocated. This dimensional approach transforms the resource indication from a flat list of resource blocks into a structured hierarchy of resource units, enabling more compact signaling while maintaining the ability to indicate any combination of resources.
2Measurement precision
If the eNB indicates the EPDCCH to the UE by using a larger amount of signaling, then the UE can detect and recover the EPDCCH correctly, but the signaling overhead increases
Solution Approach 1:
The eNB performs preliminary configuration by dividing the total control channel resources into a predetermined number of resource units (RUs) before transmission. This preliminary structuring allows the eNB to indicate EPDCCH allocation using compact indices rather than explicit resource descriptions. The UE, knowing the RU structure in advance, can efficiently decode the indication and accurately locate the EPDCCH resources without requiring excessive signaling details.
3Adaptability or versatility
If resource units are assigned for the control channel, then the control channel can be flexibly allocated, but the complexity of resource management increases
Solution Approach 1:
The resource unit (RU) structure serves multiple functions simultaneously: it acts as a basic allocation unit for EPDCCH resources, a grouping mechanism for resource blocks, and an indexable entity for compact signaling. Each RU can contain one or more resource blocks, allowing the system to adapt to different allocation scenarios. The combinatorial index mechanism provides a universal way to indicate any combination of RUs, simplifying the resource management complexity while maintaining high allocation flexibility.
Data Source
AI summary
A method of detecting a control channel is disclosed. The method comprises determining a number of a plurality of resource units assigned for the control channel according to a size indicator; determining the plurality of resource units according to a combinatorial index, wherein the combinatorial index is determined according to the number of the plurality of resource units and a number of total resource units; and detecting the control channel according to the plurality of resource units.