LTE Base Station Resource Allocation for Delay Reduction
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Solution Overview
Problem
The persistent scheduling scheme in LTE networks experiences increased transmission delays due to varying numbers of reserved resource blocks per frame, making it difficult to secure resources for retransmissions, especially in frames with high reservation rates.
Innovation Solution
A method that calculates a relational value based on the number of reserved resources on a time frame basis, allowing for the periodic reservation of resources with a small relational value, thereby equalizing the number of reserved resource blocks across frames and reducing transmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are reserved for retransmission in persistent scheduling, then transmission reliability is improved, but resource utilization efficiency deteriorates due to useless reservation
Solution Approach 1:
The patent makes the retransmission resource reservation dynamic by checking whether retransmission is actually needed before allocating resources. The base station determines whether to reserve retransmission resources based on current transmission status, transforming the static reservation approach into a dynamic one that adapts to actual needs.
Solution Approach 2:
The patent allows reserved retransmission resources to be released and reallocated when retransmission is not needed. By discarding unnecessary reservations and recovering these resources for other uses, the system improves overall resource utilization while maintaining reliability when retransmission is actually required.
2Loss of time
If VRBs are reserved to minimize transmission delay in persistent scheduling, then transmission delay is reduced, but resource allocation flexibility deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation by allowing the same time-frequency resources to serve different purposes at different times. Resources are reserved for persistent scheduling when needed for delay-sensitive traffic, and released for dynamic scheduling when flexibility is required, creating a time-varying allocation strategy.
Solution Approach 2:
The patent uses periodic resource reservation aligned with traffic generation cycles for persistent scheduling, while allowing non-periodic flexible allocation for dynamic scheduling. This periodic vs. aperiodic approach enables the system to minimize delay for periodic traffic while maintaining flexibility for irregular traffic patterns.
3Adaptability or versatility
If resources are allocated by dynamic scheduling, then resource allocation flexibility is improved, but transmission delay increases due to signaling overhead
Solution Approach 1:
The patent extracts the signaling overhead burden from each individual resource allocation by establishing persistent scheduling reservations in advance. The periodic allocation pattern is extracted and predetermined, eliminating the need for repeated signaling for each transmission and reducing overall delay.
Solution Approach 2:
The patent performs preliminary resource reservation through persistent scheduling before actual data transmissions occur. By pre-allocating resources for periodic traffic and pre-configuring the allocation pattern, the system avoids delay-causing signaling operations at the time of each transmission.
Data Source
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AI summary
A base station (100) includes means (103) for obtaining a relational value related to a number of reserved resources on a time frame basis, and means (102) for reserving a resource of a time frame with the relational value being small as a resource that can be used periodically.