Puncture Recovery for Multi-Priority Wireless Scheduling
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Solution Overview
Problem
In wireless communication systems, the efficient use of resources is hindered by puncturing of lower priority transmissions by higher priority transmissions, leading to elevated data error rates and increased latency, particularly in multi-priority scheduling scenarios where different services have varying transmission time intervals (TTIs) and priorities.
Innovation Solution
The implementation of puncture recovery and resource reclaiming techniques, where a base station identifies and transmits a higher priority transmission with a shorter TTI within a lower priority transmission's TTI, allowing the punctured portion to be retransmitted in a subsequent portion of the original TTI, enabling the user equipment (UE) to recover and merge the punctured data without retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a higher priority transmission punctures a lower priority transmission, then the higher priority service latency is reduced, but the lower priority transmission error rate increases
Solution Approach 1:
The lower priority transmission is segmented into multiple parts, with the punctured portion being identified and separated. The UE receives indicators identifying which portions are punctured and reconstructs the complete transmission by combining received segments, thereby maintaining reliability while allowing priority-based puncturing.
Solution Approach 2:
The system discards the punctured portion of the lower priority transmission temporarily, then recovers it by receiving the same data through the higher priority transmission channel. The UE merges the recovered punctured portion with non-punctured portions to reconstruct the complete original transmission.
2Loss of time
If a higher priority transmission punctures a lower priority transmission, then the higher priority service is delivered faster, but the overall network resource efficiency decreases
Solution Approach 1:
The system merges the punctured portion with non-punctured portions at the UE side to reconstruct the complete lower priority transmission. This allows simultaneous delivery of both high-priority (low-latency) and low-priority (resource-efficient) services by combining received segments, thereby improving overall network resource efficiency.
Solution Approach 2:
The network introduces intermediary signaling (indicators identifying punctured portions) that mediates between the conflicting requirements of high-priority low-latency transmission and low-priority resource-efficient transmission. This intermediary information enables the UE to correctly reconstruct data without requiring redundant retransmissions.
3Reliability
If punctured portions are retransmitted in subsequent portions of the original TTI, then data error rates are reduced, but the transmission complexity increases
Solution Approach 1:
The UE performs self-service by autonomously identifying punctured portions through received indicators and reconstructing complete transmissions by merging segments. This self-service approach reduces data error rates without requiring complex network-side retransmission protocols, as the UE handles the recovery process independently.
4Loss of time
If HARQ re-transmissions are avoided through puncture recovery, then latency is reduced, but the system complexity increases
Solution Approach 1:
The system performs preliminary action by pre-identifying and marking punctured portions with indicators before transmission. This preliminary marking enables the UE to reconstruct data in real-time without waiting for HARQ feedback and retransmissions, thereby reducing latency while managing system complexity through advance preparation.
Data Source
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AI summary
Various techniques provide for identifying and transmitting a first transmission to a UE in a first transmission time interval (TTI), and puncturing a portion of the first transmission with a higher priority second transmission that has a shorter TTI than the first TTI. The punctured portion of the first transmission may then be transmitted in a subsequent portion of the first TTI, concurrently with an originally allocated portion of the first transmission for that subsequent portion of the TTI. A UE may identify the punctured portion of the first transmission, and identify that the punctured portion of the first transmission is being transmitted in the subsequent portion of the first TTI. The UE may decode the received transmissions and merge the punctured portion with other, non-punctured, portions of the first transmission.