Data Duplication in Wireless Communication Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring reliable and low-latency data transmission, particularly in scenarios requiring Ultra-Reliable and Low Latency Communications (URLLC), where traditional methods may not meet the reliability and latency requirements due to limited bandwidth and poor channel conditions.
Innovation Solution
The implementation of data duplication techniques in wireless communication systems, where a user equipment (UE) duplicates data units and constructs additional Radio Link Control (RLC) Protocol Data Units (PDUs) for transmission, allowing for packet duplication across multiple links to enhance reliability and diversity gain, particularly in scenarios where single transmission fails to meet URLLC requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication is implemented across multiple links, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the data transmission process by dividing data units into multiple copies that are transmitted through different RLC entities and logical channels. Each segmented copy travels independently through the network, allowing the system to achieve high reliability without requiring complex end-to-end retransmission mechanisms. The segmentation principle is applied at the PDCP layer where data is split into multiple parallel transmission paths.
Solution Approach 2:
The patent implements copying by creating duplicate copies of data units at the PDCP layer and transmitting them through multiple RLC entities. Instead of using complex error correction codes or retransmission protocols, the system simply transmits multiple identical copies of the same data, and the receiver selects the first successfully received copy. This copying approach significantly improves reliability while keeping the added complexity relatively simple.
2Reliability
If multiple RLC PDUs are constructed for data duplication, then diversity gain is improved, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple RLC entities and their associated logical channels before data transmission begins. The duplication factor and transmission parameters are predetermined, allowing the system to quickly generate multiple RLC PDUs without extensive real-time processing. This preliminary setup reduces the time penalty associated with creating multiple copies during active transmission.
Data Source
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AI summary
Methods and apparatuses for transmitting data duplication in a wireless communication system are disclosed herein. In one method for a user equipment, UE, configured with data duplication. The UE duplicates a data unit into a first data unit and a second data unit (2905). The UE constructs a second Radio Link Control, RLC, Packet Data Unit, PDU, used for transmitting the second data unit (2910). The second data unit is a second RLC Service Data Unit, SDU. The UE receives a control command from a network node (2915). The control command is used to deactivate the data duplication. The UE discards the second RLC PDU if the second RLC PDU includes the second RLC SDU (2920).