RLC Entity Prioritization for Latency Reduction in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, the increasing number of user equipment (UEs) and data transmission demands pose challenges in efficiently utilizing limited radio resources, particularly in reducing latency and prioritizing Radio Link Control (RLC) entities to ensure timely and reliable data transmission.
Innovation Solution
The method involves configuring multiple RLC entities with different priorities, where special Service Data Units (SDUs) are transmitted through higher-priority RLC entities, and normal SDUs through lower-priority entities, with the option of duplicating special SDUs for multiple prioritized RLC entities to ensure timely and prioritized delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple RLC entities with different priorities are configured to transmit special SDUs through higher-priority entities, then latency is reduced and critical data delivery is improved, but device complexity increases
Solution Approach 1:
The patent segments the RLC entity functionality into multiple priority levels (first RLC entities for special SDUs, second RLC entities for normal SDUs). This segmentation allows critical data to be transmitted through dedicated high-priority paths while maintaining standard transmission for non-critical data, thereby reducing latency for time-sensitive applications without completely redesigning the entire RLC layer.
Solution Approach 2:
The patent applies local quality by assigning different priority characteristics to different RLC entities based on their intended data type. Special SDUs (such as TCP ACK packets, SDAP control PDUs, and ROHC context update packets) are routed to first RLC entities with higher priority, while normal data uses second RLC entities. This localized optimization reduces latency for critical data without affecting the overall system uniformly.
2Reliability
If special SDUs are duplicated and transmitted to multiple first RLC entities, then reliability is improved, but loss of substance increases
Solution Approach 1:
The patent implements copying by duplicating special SDUs and transmitting them to multiple first RLC entities simultaneously. This ensures that critical data packets are received through at least one successful transmission path, improving reliability for time-sensitive applications. The copying is selectively applied only to special SDUs that require high reliability, rather than all data traffic.
Solution Approach 2:
The patent applies partial action by selectively duplicating only special SDUs (such as TCP ACK packets, SDAP control PDUs, and ROHC context update packets) rather than all data packets. This targeted approach improves reliability for critical data while minimizing the additional resource consumption that would result from duplicating every packet.
3Loss of time
If PDCP entity delivers special SDU without re-ordering procedure, then latency is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent extracts the re-ordering procedure requirement specifically for special SDUs transmitted through first RLC entities. By removing the re-ordering step for these high-priority packets, the patent significantly reduces latency for critical data delivery. Normal SDUs continue to undergo re-ordering to maintain delivery accuracy, while special SDUs are delivered immediately upon receipt.
Solution Approach 2:
The patent introduces dynamic behavior by applying different delivery procedures based on SDU type and priority. Special SDUs are delivered immediately without re-ordering to minimize latency, while the system dynamically adjusts to maintain overall data integrity through selective application of delivery procedures based on the criticality of the data being transmitted.
Data Source
AI summary
The present invention relates to a method for transmitting signals by a transmission end in a wireless communication system. In particular, the method includes the steps of: configuring one Packet Data Convergence Protocol (PDCP) entity, at least one first RLC entity related to the one PDCP entity and at least one second RLC entity related to the one PDCP entity; determining whether a service data unit (SDU) to be transmitted is a special SDU or not; if the SDU is the special SDU, transmitting the SDU to the at least one first RLC entity; and if the SDU is not the special SDU, transmitting the SDU to the at least one second RLC entity.