Packet Transmission Resequencing to Cancel Unnecessary PDCP Duplicates
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Solution Overview
Problem
Existing PDCP duplication methods in wireless networks suffer from reduced radio efficiency due to unnecessary duplicated transmissions, particularly in scenarios where channel conditions are good or latency over the Xn interface is high, leading to wasted resources and increased signaling overhead.
Innovation Solution
Implementing a dynamic control mechanism with re-sequence blocks to alter the order of packet transmission over different radio links, allowing for early identification and cancellation of unnecessary duplicates, thereby improving radio resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP duplication is implemented to improve reliability and reduce latency, then reliability and latency performance are improved, but radio efficiency deteriorates due to unnecessary duplicated transmissions
Solution Approach 1:
The system implements feedback mechanisms where the receiving end sends status information about successfully received packets back to the transmitting end. This feedback enables the transmitting end to identify and cancel unnecessary duplicated transmissions, thereby improving radio efficiency while maintaining the reliability benefits of PDCP duplication.
Solution Approach 2:
The patent applies the discarding principle by enabling the transmitting end to discard (cancel) duplicated packets that are determined to be unnecessary based on feedback information. This prevents waste of radio resources on transmissions that would not contribute to reliability improvement, thus resolving the contradiction between reliability and radio efficiency.
2Reliability
If PDCP duplication is used to ensure reliable transmission, then reliability is improved, but signaling overhead increases
Solution Approach 1:
The system implements partial action by selectively applying duplication cancellation only to packets that are determined to be unnecessary, rather than canceling all duplicated transmissions. This partial approach maintains the necessary signaling for reliability while reducing excessive signaling overhead from unnecessary duplicates.
3Reliability
If duplicated transmissions are maintained to improve reliability, then reliability is improved, but radio resource utilization deteriorates
Solution Approach 1:
Feedback information from the receiving end about successfully received packets enables the transmitting end to identify which duplicated transmissions are unnecessary. This feedback mechanism allows for optimization of radio resource utilization by canceling only the redundant transmissions while maintaining necessary duplicates for reliability.
Solution Approach 2:
By discarding (canceling) unnecessary duplicated transmissions identified through feedback, the system recovers radio resources that would have been wasted. This resolves the contradiction by maintaining reliability through necessary duplicates while improving radio resource utilization by eliminating redundant transmissions.
Data Source
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AI summary
A method implemented by a device includes submitting a stream of packets to lower layers associated with a first communication link between the device and a peer device for transmissions in a first order over the first communication link; submitting the stream of packets to lower layers associated with a second communication link between the device and the peer device for transmissions in a second order over the second communication link, the second order being different from the first order, and the second communication link being different from the first communication link; and determining receipt of an indication indicating a packet of the stream of packets being successfully transmitted over the second communication link while submitting the stream of packets for the transmissions over the first and second communication links, and based thereon, causing the packet to be discarded from a first transmission buffer associated with the first communication link.