PDCP Duplication for Wireless Data Transmission Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving ultra-reliable and low-latency data transmission, particularly in IoT environments, where traditional methods struggle to ensure high success rates and minimize latency while optimizing resource usage.
Innovation Solution
The method involves duplicating packet data convergence protocol (PDCP) packet data units and transmitting them through multiple radio link control (RLC) and medium access control (MAC) entities, using different physical layers or antennas, and configuring uplink resource allocation during random access in cells that only allow sounding reference signals (SRS) for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted through multiple RLC and MAC entities using different physical layers, then reception success rate is improved, but device complexity increases
Solution Approach 1:
The patent segments the data transmission path by duplicating PDCP PDUs and transmitting them through multiple independent RLC entities and MAC entities. Each entity handles a portion of the duplicated data packets, allowing parallel transmission through different physical layers (e.g., different carriers or antennas). This segmentation increases reception success rate by providing multiple independent transmission paths while managing complexity through structured duplication and independent handling at each layer.
Solution Approach 2:
The patent changes transmission parameters by configuring multiple RLC and MAC entities with different operational parameters. Each entity can be configured with different physical layer settings, carriers, or antenna configurations. This parameter diversification allows the system to adapt to different channel conditions through multiple entities, improving reliability without requiring complete redesign of the transmission architecture.
2Productivity
If uplink resource allocation is configured during random access, then resource utilization is improved, but latency increases
Solution Approach 1:
The patent implements preliminary action by configuring uplink resource allocation during the random access phase, specifically in the random access response message. This preliminary configuration establishes resource allocation before actual data transmission begins, allowing the terminal to immediately use pre-allocated resources without additional signaling delays. The resource allocation is prepared in advance during random access, improving resource utilization while minimizing latency by avoiding post-connection configuration delays.
3Reliability
If multiple physical layers are used for transmission, then data transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial action by selectively activating multiple physical layers only when needed for critical data transmissions. Instead of continuously using all available physical layers, the system can dynamically activate specific RLC and MAC entities based on traffic requirements, channel conditions, and reliability needs. This partial utilization of multiple physical layers improves data transmission reliability for important packets while avoiding the energy consumption of continuously operating all transmission paths at full capacity.
Data Source
AI summary
The present disclosure relates to a communication system and technique that may be applied to intelligent services based on a 5G communication technology and an IoT-related technology. The present disclosure provides a method for data transmission of a terminal in a wireless communication system that includes inputting a packet data convergence protocol packet data unit (PDCP PDU) output from a PDCP entity to a first radio link control (RLC) entity and a second RLC entity. The method also includes inputting a first radio link control packet data unit (RLC PDU) output from the first RLC entity and a second RLC PDU output from the second RLC entity to a medium access control (MAC) entity and transmitting a medium access control packet data unit (MAC PDU) output from the MAC entity through a first physical layer (PHY) entity and a second physical layer entity.