L1 Buffer Subframe Storage for LBT Failure Handling
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Solution Overview
Problem
Existing methods for handling data transmissions during Listen Before Talk (LBT) failures in unlicensed frequency spectra are inefficient, leading to scheduling delays and inadequate quality of service (QoS) support, as they require rescheduling at higher protocol layers and result in unnecessary resource allocation and load on processing resources.
Innovation Solution
A method and network device that store data of a subframe in an L1 buffer upon LBT failure, allowing for efficient handling and prioritization of data transmission when LBT succeeds, thereby reducing scheduling delays and improving resource utilization by enabling data transmission without involving higher protocol layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is handled at higher protocol layers during LBT failure, then reliability of data transmission is improved, but scheduling delays increase and productivity decreases
Solution Approach 1:
The patent segments the handling of LBT failure into two parts: L1 layer stores the data locally without triggering higher layer rescheduling, while L2 layer continues normal scheduling operations. This segmentation allows immediate local response at L1 while maintaining overall system scheduling efficiency, resolving the contradiction between reliable data handling and scheduling productivity.
Solution Approach 2:
The patent implements preliminary action by having the L1 layer store data in advance during LBT failure before higher protocol layers can intervene. This preliminary storage action prevents data loss while avoiding the scheduling delays that would occur if higher layers were involved, thus maintaining both reliability and productivity.
2Reliability
If rescheduling at higher protocol layers is performed during LBT failure, then data loss is prevented, but latency increases and time consumption increases
Solution Approach 1:
The L1 layer performs preliminary storage of data during LBT failure, acting before higher protocol layers can process rescheduling requests. This preliminary action prevents data loss immediately without waiting for higher layer intervention, thereby preventing the time loss that would otherwise occur through multi-layer rescheduling procedures.
Solution Approach 2:
The patent extracts the data storage function from the higher protocol layer rescheduling process and places it at the L1 layer. This extraction allows data to be secured locally without involving the time-consuming higher layer rescheduling mechanisms, thus preventing data loss while minimizing time consumption.
3Reliability
If higher protocol layers are involved in handling LBT failure, then data integrity is maintained, but processing resource utilization deteriorates
Solution Approach 1:
The patent segments the data integrity assurance function from the higher protocol layers and assigns it to the L1 layer through simple local storage. This segmentation maintains data integrity at the source without requiring complex processing at higher layers, thus preserving reliability while reducing processing resource utilization and device complexity.
Solution Approach 2:
The L1 layer provides self-service by storing data locally during LBT failure without requiring assistance from higher protocol layers. This self-service approach maintains data integrity through simple local action, avoiding the need for complex inter-layer coordination and thereby reducing processing resource load and device complexity.
Data Source
AI summary
There is provided mechanisms for scheduling subframes at protocol layer L1. The method is performed by a network device. A method comprises obtaining, at the protocol layer L1, an indication of an occurrence of Listen Before Talk (LBT) failure for transmission of a subframe in an unlicensed frequency spectrum. The method comprises storing, in an L1 buffer, data of the subframe to be transmitted in the unlicensed frequency spectrum as a result thereof.