Dynamic Delay Scheduling for VoLTE PDCCH Overhead Reduction
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Solution Overview
Problem
Current radio resource scheduling methods for VoLTE in LTE networks face challenges in reducing PDCCH resource overhead while maintaining high modulation and coding levels, leading to suboptimal flexibility and capacity utilization in base stations.
Innovation Solution
A dynamic delay scheduling method that binds consecutive voice data packets and schedules them through a single PDCCH, determining the scheduling mode based on semi-persistent and dynamic scheduling capabilities, and utilizing attribute information to reserve buffer space and manage uplink and downlink data queues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic scheduling mode is used to achieve higher modulation and coding level, then the throughput is improved, but PDCCH resource overhead increases
Solution Approach 1:
The patent combines multiple voice data packets into a single transport block for scheduling. By merging several packets that would otherwise require separate PDCCH assignments into one unified transport block, the system reduces the number of PDCCH messages while maintaining efficient resource allocation and higher modulation/coding levels, thus reducing PDCCH overhead without sacrificing throughput.
Solution Approach 2:
The patent introduces dynamic adjustment of transport block sizes and scheduling parameters based on channel conditions and traffic patterns. The system dynamically determines the optimal number of packets to combine and adjusts modulation and coding schemes adaptively, allowing it to achieve high throughput when channel conditions permit while minimizing PDCCH overhead through intelligent resource allocation.
2Quantity of substance
If semi-persistent scheduling mode is used to reduce PDCCH resource overhead, then control channel overhead is reduced, but the maximum MCS level is limited to 15
Solution Approach 1:
The patent merges multiple voice packets into a single transport block scheduled dynamically, but optimizes the combination strategy to reduce PDCCH overhead. This approach achieves overhead reduction similar to semi-persistent scheduling while allowing the use of higher MCS levels (beyond 15) for the combined transport block, thereby improving throughput without being constrained by semi-persistent scheduling MCS limitations.
Solution Approach 2:
The patent changes the scheduling parameters by allowing dynamic adjustment of MCS levels beyond the semi-persistent scheduling limit of 15. By modifying the transport block structure to combine multiple packets and applying dynamic MCS selection based on channel quality, the system achieves both low PDCCH overhead and high MCS levels, effectively resolving the contradiction between overhead reduction and throughput optimization.
3Ease of manufacture
If simple scheduling mode is used to ease implementation, then ease of manufacture is improved, but flexibility is poor and PDCCH resources can't be assigned rationally
Solution Approach 1:
The patent segments the scheduling process into distinct functional modules: packet collection, transport block formation, PDCCH generation, and resource allocation. This modular segmentation maintains implementation simplicity while enabling flexible configuration of packet combining strategies, MCS selection, and resource assignment, thus achieving both ease of implementation and operational flexibility.
Solution Approach 2:
The patent introduces dynamic parameters and configurable settings that allow the scheduling system to adapt to different traffic conditions and channel qualities without requiring complex reimplementation. The dynamic adjustment of transport block sizes, packet combining factors, and MCS levels provides flexibility while maintaining a relatively simple base implementation structure.
Data Source
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Figure 2(b)
Figure 2(c)
AI summary
The present invention relates to a dynamic delay scheduling method and base station for voice data. The dynamic delay scheduling method includes the following steps: judging whether semi-persistent scheduling manner is started, and whether the UE supports semi-persistent scheduling manner; if semi-persistent scheduling manner is started, and the UE supports semi-persistent scheduling manner, implementing scheduling in semi-persistent scheduling manner; else if semi-persistent scheduling manner is not started, or the UE does not support semi-persistent scheduling manner, judging whether dynamic delay scheduling manner is started, if yes, implementing scheduling by binding two consecutive voice data packets in dynamic delay scheduling manner; else if not, implementing scheduling in dynamic scheduling manner. By adopting the dynamic delay scheduling method and base station provided by the present invention, the PDCCH resource overhead is reduced by half, meanwhile, higher level of modulation and encoding is kept, and flexibility of voice service scheduling is improved, which is beneficial to reasonable allocation of channel resources and improving user capacity of the base station.