Relay Node Downlink Control Information Detection via R-PDCCH Segmentation
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Solution Overview
Problem
Relay nodes in LTE-A systems face challenges in detecting downlink control information due to the lack of effective solutions for R-PDCCH detection, which affects their ability to receive and process control signals efficiently.
Innovation Solution
A method and device for relay nodes to detect downlink control information by receiving and processing control resources based on R-CCE or PRB indices, utilizing FFT and de-interleaving to acquire specific search spaces and perform blind detection, thereby identifying own control information within reserved physical resource blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If relay nodes perform blind detection on PDCCH in the same manner as UEs, then the detection process becomes complex and inefficient, but the relay nodes can receive control information
Solution Approach 1:
The patent segments the control channel detection process by creating a dedicated R-PDCCH search space separate from the common PDCCH search space. Relay nodes perform blind detection only on the R-PDCCH search space configured by higher layers, while UEs monitor the common PDCCH search space. This segmentation simplifies the detection process for relay nodes by reducing the search space they need to monitor, while ensuring reliable control information reception through dedicated resource allocation.
2Productivity
If relay nodes use the same search space as UEs for PDCCH detection, then resource allocation becomes inefficient, but system compatibility is maintained
Solution Approach 1:
The patent divides the control channel resources into two separate search spaces: a common PDCCH search space for UEs and an R-PDCCH search space for relay nodes. This segmentation allows efficient resource allocation by dedicating specific resources to relay nodes, improving productivity. At the same time, system compatibility is maintained because UEs continue to use the common search space as before, and the R-PDCCH search space is configured through higher layer signaling without affecting existing UE operations.
3Measurement precision
If relay nodes monitor all candidate control channels like UEs, then detection accuracy improves, but energy consumption increases
Solution Approach 1:
The patent segments the blind detection process by configuring a dedicated R-PDCCH search space with specific candidate control channels for relay nodes. Instead of monitoring all candidate channels in the common search space, relay nodes only perform blind detection on the R-PDCCH candidates configured by higher layers. This reduces the number of detection attempts and associated energy consumption while maintaining detection accuracy through targeted monitoring of relevant control channels.
4Reliability
If relay nodes perform blind detection on interleaved R-CCEs, then control information reception is reliable, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by configuring the R-PDCCH search space and associated R-CCE resources through higher layer signaling before actual control information transmission. The relay node receives configuration parameters including the number of R-PDCCH candidates, aggregation levels, and resource block assignments in advance. This preliminary configuration enables the relay node to perform blind detection efficiently on pre-defined resources without needing to process all possible interleaved R-CCE combinations, reducing processing complexity while ensuring reliable control information reception.
Data Source
AI summary
A method and a device for detecting downlink control information. The method includes: a Relay Node (RN) receiving control information born in a Relay Physical Downlink Control Channel (R-PDCCH) sent by an evolved Node B (eNB) to acquire a control resource; the RN performing detection on the control resource according to an index of the control resource to acquire own control information; wherein the control resource is a Relay Control Channel Element (R-CCE) or a Physical Resource Block (PRB). System overhead can be saved and system transmission efficiency can be improved.