Relay Control Channel Layout for Variable LTE Control Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE wireless communication systems, relay nodes face challenges in efficiently receiving and transmitting control channel information due to discrepancies in control region sizes between relay MBSFN and access node subframes, leading to potential data loss and complexity in control channel design.
Innovation Solution
The solution involves configuring the access node to transmit a fixed or flexible control region size, allowing the relay node to receive data only after transmitting a specific number of PDCCH symbols, and designing a new relay control channel structure that optimizes resource allocation and modulation order for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the access node transmits control information in relay MBSFN subframes with variable control region sizes, then the control channel can adapt to different traffic conditions, but the relay node experiences data loss and reception reliability deteriorates due to size discrepancies
Solution Approach 1:
The patent implements dynamic control region size adjustment in relay MBSFN subframes. The access node determines the control region size based on the number of relay control channel elements needed, allowing the control channel to adapt to varying traffic conditions while maintaining reliable data reception through synchronized timing between control region transmission and relay node reception switching.
Solution Approach 2:
The access node transmits control information in the control region before the relay node switches to reception mode. By preliminarily transmitting the control region with the determined size, the system ensures that control information is delivered before data transmission begins, preventing data loss and maintaining reception reliability.
2Reliability
If the access node uses a fixed control region size in relay MBSFN subframes, then data transmission reliability improves, but scheduling flexibility and resource utilization deteriorate
Solution Approach 1:
The system dynamically adjusts the control region size based on the actual number of relay control channel elements required. This dynamic approach maintains reliability by ensuring synchronized timing while improving productivity by allowing the control region size to adapt to different scheduling scenarios, thereby optimizing resource utilization.
3Reliability
If the relay control channel uses a wide resource block range, then coverage and signal robustness improve, but interference with other channels increases and system complexity rises
Solution Approach 1:
The patent confines the relay control channel to a specific resource block range, creating a localized control region. This local quality approach improves signal robustness within the designated resources while reducing interference with other channels and simplifying the overall control channel design by clearly defining the channel's spatial boundaries in the frequency domain.
4Loss of information
If the relay node switches to reception mode earlier to capture more control information, then control channel reception improves, but data transmission timing is disrupted and productivity decreases
Solution Approach 1:
The access node preliminarily transmits the control region with a determined size before the relay node switches to reception mode. This preliminary action ensures that the relay node receives all necessary control information during the control region period, then switches to data reception at the correct timing, preventing both information loss and timing disruption, thereby maintaining data transmission efficiency.
Data Source
AI summary
A method for wireless communication is provided. The method comprises transmitting a relay downlink control information (R-DCI) block in a plurality of resource blocks.