Logical Channel Group Mapping for 5G Backhaul Buffer Reporting
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Solution Overview
Problem
In wireless relay networking architectures, especially in 5G, the current buffer status report (BSR) mechanism at a granularity of logical channel groups leads to incorrect counting of data volumes on secondary logical channel groups, resulting in transmission delays.
Innovation Solution
A method for determining an association between logical channel groups, where a first backhaul node receives a buffer status report from a child node, determines associated logical channel groups based on a mapping relationship, and sends a second buffer status report to a parent node to accurately report uplink buffer statuses, thereby reducing transmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If buffer status report is performed at a granularity of logical channel group, then the reporting complexity is reduced, but the data volume counting accuracy on secondary logical channel groups becomes incorrect
Solution Approach 1:
The patent segments the logical channel groups into first logical channel groups (between IAB node and child node) and second logical channel groups (between IAB node and parent node), and establishes corresponding mapping relationships between them. This segmentation allows the IAB node to accurately track and report buffer statuses for different logical channel groups separately, resolving the accuracy issue while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent introduces a mapping relationship as an intermediary mechanism between first logical channel groups and second logical channel groups. This mapping relationship serves as a mediator that enables the IAB node to correctly associate and count data volumes across different logical channel groups, ensuring accurate buffer status reporting without increasing the fundamental reporting granularity.
2Adaptability or versatility
If different LCHs belonging to same first LCG are separately mapped to different second LCGs, then the bearer mapping flexibility is improved, but the data volume counting on second LCGs becomes incorrect
Solution Approach 1:
The patent segments the mapping process by establishing separate mapping relationships for different first logical channel groups to second logical channel groups. This segmentation allows flexible bearer mapping while maintaining accurate data volume counting through structured association between mapped groups, preventing the confusion that would arise from unmapped relationships.
Solution Approach 2:
The patent implements feedback mechanisms where the IAB node uses the mapping relationships to correctly identify and count data volumes on second logical channel groups when generating buffer status reports. This feedback loop ensures that flexible mapping decisions are accompanied by accurate counting, as the IAB node references the established mapping relationships when reporting buffer statuses to parent nodes.
3Measurement precision
If the IAB node cannot correctly count data volumes on second LCGs, then the buffer status report accuracy is reduced, but the transmission delay increases
Solution Approach 1:
The patent applies preliminary action by establishing mapping relationships between first and second logical channel groups in advance, before data transmission occurs. This pre-establishment of mapping relationships enables the IAB node to accurately count data volumes on second LCGs when buffer status reports are generated, eliminating the need for complex real-time calculations and reducing transmission delays.
Solution Approach 2:
The patent implements feedback mechanisms where the IAB node uses the mapping relationships to correctly identify and count data volumes on second logical channel groups when generating buffer status reports. This feedback loop ensures that accurate counting is achieved without increasing processing time, as the IAB node simply references pre-established mapping relationships rather than performing complex real-time analysis.
Data Source
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Figure 3
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AI summary
Embodiments of this application provide a method for determining an association between logical channel groups, an apparatus, and a system, and relate to the field of communication technologies, so that a first backhaul node can accurately determine an association relationship between an LCG between the first backhaul node and a parent node and an LCG between the first backhaul node and a child node. The solution includes: The first backhaul node receives a first buffer status report from a first device, where the first buffer status report is used to determine uplink buffer statuses of one or more first logical channel groups of a MAC entity corresponding to the first backhaul node and the first device. The first backhaul node determines, based on the one or more first logical channel groups and a first mapping relationship, second logical channel groups associated with the one or more first logical channel groups, where a second device is a parent node of the first backhaul node, and the first mapping relationship includes a mapping relationship between the one or more first logical channel groups and one or more second logical channel groups of a MAC entity corresponding to the first backhaul node and the second device.