Out-of-Order SDU Reception and Reordering for Low-Latency Delivery
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Solution Overview
Problem
The increasing number of user equipments and data transmission requirements in wireless communication systems necessitate a method to efficiently utilize limited radio resources for uplink and downlink data transmission, while reducing latency and supporting new radio access technologies.
Innovation Solution
The method involves delivering service data units out-of-order from a first layer to a second layer, deciphering them in reception order, reassembling and reordering them based on sequence numbers, and delivering them to an upper layer in sequence, which can be implemented in user equipment or network nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data units are transmitted in sequence order to ensure reliable delivery, then delivery reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by pre-encrypting data units before transmission and preparing decryption keys in advance at the receiver side. This allows the receiver to immediately decrypt data units as they arrive without sequential processing delays, thus reducing transmission latency while maintaining reliable delivery through the established encryption/decryption mechanism
Solution Approach 2:
The patent segments the data transmission process into independent parallel operations: multiple data units are encrypted separately, transmitted independently, and decrypted separately at the receiver. This segmentation allows simultaneous processing of multiple data units rather than sequential handling, reducing overall transmission latency while ensuring each unit is reliably delivered
2Productivity
If multiple data streams are transmitted simultaneously to increase communication capacity, then productivity is improved, but resource management complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of standardized encryption/decryption protocols and key management systems. This intermediary layer simplifies the management of multiple data streams by providing uniform processing rules, making it easier to handle resource allocation and coordination across multiple simultaneous transmissions without linearly increasing system complexity
3Reliability
If data units are decrypted in sequence order to maintain data integrity, then data integrity is improved, but processing speed decreases
Solution Approach 1:
The patent applies preliminary action by pre-preparing decryption keys and configuring the decryption mechanism before data units arrive. This allows the receiver to immediately decrypt data units as they are received without sequential processing delays, thus improving processing speed while maintaining data integrity through the established decryption protocol that ensures proper data reconstruction
Data Source
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AI summary
In the present invention, service data units (SDUs) are delivered from a first layer to a second layer out-of-order irrespective of sequence numbers (SNs) of the SDUs. The second layer deciphers the SDUs in the order of reception from the first layer irrespective of the SNs. The second layer may reorders the deciphered SDUs in the order of the SNs, and delivers them to an upper layer in sequence.