Relay Node Synchronization via Fixed PDSCH Start Points
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Solution Overview
Problem
In current wireless communication systems, relay nodes struggle to synchronize with access nodes due to limitations in receiving control information, leading to potential data loss or inefficient resource utilization, as they cannot transmit and receive data simultaneously and often miss portions of data during transitions between transmission and reception modes.
Innovation Solution
The access node informs the relay node of a fixed or variable point in a subframe where PDSCH data begins, allowing the relay node to synchronize its reception accurately, either by pre-configuring the PDCCH size or using high-layer signaling to ensure timely initiation of PDSCH data reception, thereby compensating for switching delays and ensuring complete data retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relay nodes transmit and receive data simultaneously, then data throughput is improved, but hardware complexity and power consumption increase
Solution Approach 1:
The relay node dynamically switches between transmission and reception modes based on timing information received from the access node. The node transitions from a static, simultaneous transmit-receive architecture to a dynamic time-division approach, adjusting its operational state according to the indicated fixed or variable point in the subframe structure.
Solution Approach 2:
The system implements periodic transmission and reception cycles within the subframe structure. The access node indicates specific periodic points (fixed or variable) where PDSCH data begins, creating a rhythmic pattern of transmit-receive operations that allows the relay node to efficiently alternate between modes without requiring complex simultaneous processing hardware.
2Device complexity
If relay nodes switch between transmission and reception modes, then hardware complexity is reduced, but data loss occurs during transition periods
Solution Approach 1:
The access node provides advance timing information indicating the fixed or variable point where PDSCH data begins. This preliminary notification allows the relay node to prepare for mode switching in advance, transitioning from transmission to reception mode before the actual data arrival, thereby preventing data loss during the transition period.
Solution Approach 2:
The system establishes a feedback loop where the access node monitors and communicates the actual PDSCH start timing to the relay node. This feedback mechanism allows the relay node to adjust its switching timing accurately, ensuring complete data reception while maintaining simple hardware architecture.
3Ease of operation
If relay nodes use fixed PDCCH size configuration, then synchronization is simplified, but adaptability to varying data loads is reduced
Solution Approach 1:
The system transitions from a static fixed PDCCH size configuration to a dynamic approach where the PDSCH start point can vary within the subframe. The access node indicates either a fixed point or a variable point based on actual data load conditions, allowing the relay node to adapt its synchronization timing dynamically while maintaining operational simplicity.
Solution Approach 2:
The system changes the timing parameter (PDSCH start point) based on data load conditions. When data load is predictable, a fixed timing parameter is used for simplicity. When data load varies, the timing parameter becomes variable, indicated by the access node through high-layer signaling, allowing adaptability without significantly increasing synchronization complexity.
4Measurement precision
If relay nodes wait for PDSCH data start point, then data reception accuracy is improved, but transmission efficiency decreases due to idle waiting time
Solution Approach 1:
The access node provides preliminary timing information indicating when PDSCH data will begin. The relay node uses this advance notice to prepare for reception without prolonged idle waiting. By knowing the fixed or variable start point in advance, the relay node can maintain a ready state more efficiently, improving transmission efficiency while preserving reception accuracy.
Solution Approach 2:
The system minimizes idle waiting time by continuously utilizing the relay node's capabilities. Instead of long idle periods, the relay node engages in useful preparation activities based on the indicated timing information, maintaining a state of readiness that transitions smoothly into data reception, thereby preserving both accuracy and efficiency.
Data Source
AI summary
A method for informing a relay node when to receive data. The method includes the relay node being informed of a fixed point in a subframe of data when an access node will begin transmitting relevant data over a physical downlink shared channel. The method further includes the relay node beginning to receive data at approximately the fixed point.