R-PDCCH Resource Mapping Through CCE Interleaving and VRBs
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving the Relay-Physical Downlink Control Channel (R-PDCCH) due to limitations in resource allocation and interleaving methods, which affect communication performance between Base Stations (BS) and Relay Nodes (RN).
Innovation Solution
The method involves interleaving Control Channel Elements (CCEs) and mapping them to Virtual Resource Blocks (VRBs), which are then mapped to Physical Resource Blocks (PRBs) for efficient transmission of R-PDCCH to RNs, using techniques like column permutation and frequency/time-first mapping, optimizing resource allocation and communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional resource allocation methods are used for R-PDCCH transmission, then the system maintains simplicity in resource management, but communication performance between BS and RN deteriorates due to inefficient resource utilization
Solution Approach 1:
The resource allocation process is segmented into distinct stages: CCE interleaving, VRB mapping, and PRB mapping. Each stage handles a specific aspect of resource allocation, allowing complex R-PDCCH resource management to be broken down into manageable, optimized segments that improve communication performance without overwhelming system complexity
Solution Approach 2:
Virtual Resource Blocks (VRBs) are introduced as an intermediary layer between Control Channel Elements (CCEs) and Physical Resource Blocks (PRBs). This intermediary structure enables flexible resource allocation and mapping, improving communication performance while maintaining manageable complexity through the abstraction layer
2Productivity
If direct mapping from CCE to PRB is used, then the mapping process is simple, but resource allocation efficiency deteriorates due to inability to optimize resource distribution
Solution Approach 1:
The mapping process is divided into multiple sequential steps: CCE interleaving to redistribute control channel elements, VRB assignment to allocate virtual resource blocks, and PRB mapping to assign physical resources. This segmentation enables optimized resource distribution while keeping each individual mapping step manageable in complexity
Solution Approach 2:
CCE interleaving is performed as a preliminary action before VRB and PRB mapping. This preliminary redistribution of CCEs optimizes the input for subsequent mapping stages, improving overall resource allocation efficiency while maintaining a structured, step-by-step process that controls complexity
Data Source
AI summary
A method and apparatus for transmitting and receiving a Relay Physical Downlink Control Channel (R-PDCCH) being a control channel for a relay node (RN) in a wireless communication system are disclosed. To transmit an R-PDCCH to a RN, a BS includes a processor for interleaving a predetermined number of Control Channel Elements (CCEs), mapping the interleaved CCEs to at least one Virtual Resource Block (VRB) configured for R-PDCCH transmission, mapping the at least one VRB to at least one Physical Resource Block (PRB), and a transmitter for transmitting the R-PDCCH to the RN through the at least one PRB.