TRIZ Case: Packet Duplication for URLLC Interference
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Solution Overview
Problem
In New Radio ultra reliable low latency communication (NR URLLC) systems with multiple transmission points, interference between transmit/receive points reduces the reliability of URLLC transmissions, as packets from one TRP can interfere with those from another TRP, especially when transmitting for different services like URLLC and enhanced mobile broadband (eMBB).
Innovation Solution
The system duplicates packets from two TRPs and indicates to the user equipment (UE) that they are duplicates, allowing the UE to combine them before decoding, which can be done through soft combining or concatenation based on channel quality and redundancy versions, thereby improving decoding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission points transmit packets simultaneously, then system capacity and coverage are improved, but interference between transmissions increases and reliability decreases
Solution Approach 1:
The patent segments the transmission by dividing packets into duplicate copies sent from different transmission points using different redundancy versions. The UE receives these segmented transmissions and combines them, allowing the system to maintain high capacity through parallel transmissions while improving reliability through diversified transmission paths that avoid interference.
Solution Approach 2:
The patent uses packet duplication where the same data is transmitted from multiple TRPs with different redundancy versions. This copying approach allows the UE to receive redundant copies that can be combined to overcome interference, thereby maintaining system capacity while significantly improving URLLC reliability.
2Reliability
If packets are transmitted from multiple TRPs, then coverage and robustness are improved, but interference between packets reduces reliability
Solution Approach 1:
The patent changes the redundancy version parameter for duplicate packets transmitted from different TRPs. By using different RV values (e.g., RV0 for one TRP and RV2 for another), the transmissions become distinguishable and can be properly combined at the UE, transforming the harmful interference into useful diversity while maintaining transmission robustness.
3Reliability
If the UE combines duplicate packets before decoding, then decoding reliability is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network indicate to the UE which packets are duplicates and which redundancy versions to expect. This advance information allows the UE to prepare for combining operations, reducing the actual processing complexity during reception while maintaining high decoding reliability through proactive packet management.
Data Source
AI summary
Described is a technology to reduce the interference between two or more transmit receive (Tx/Rx) points (TRPs) and improve the reliability for New Radio ultra reliable low latency communication (NR URLLC) applications. The technology operates in one aspect at a network node, and in another aspect at a user equipment. If a network device decides to use packet duplication, the network device can indicate duplication to the user equipment. The network device can send duplicate copies, e.g., via two different antenna panels, or can send one copy and coordinate with another network device (e.g., another cell) to send the other copy. When the user equipment receives the copies, the user equipment combines the data, e.g., via soft combining or concatenation into combined data, and decodes the combined data. Weights, such as corresponding to channel quality from each transmit source, can be used as factors in the combining of the data.