Base Station Scheduling for CSG User Priority in LTE
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Solution Overview
Problem
Existing LTE scheduling mechanisms fail to differentiate and prioritize Closed Subscriber Group (CSG) users over Non-Closed Subscriber Group (N-CSG) users within GBR/N-GBR bearer groups, leading to suboptimal resource allocation and QoS issues, especially in real-time scenarios and multi-UE environments.
Innovation Solution
A method and base station for CSG aware scheduling that determines a priority metric for CSG and N-CSG users based on parameters like MCS, QCI, aggregate data rate, packet delay, buffer occupancy, and priority, modifying this metric with a configured weight index to control user selection and RB allocation, prioritizing CSG users and restricting N-CSG users' data rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing scheduling mechanism allocates resources based on QoS requirements without differentiating CSG and N-CSG users, then resource allocation is simple and fair among all users, but CSG users cannot receive prioritized service and QoS is suboptimal
Solution Approach 1:
The patent applies local quality by differentiating scheduling treatment for different user groups. CSG users receive prioritized scheduling with modified priority metrics, while N-CSG users follow standard scheduling. This localized differentiation ensures CSG users get enhanced QoS without unnecessarily complicating the entire scheduling system for all users.
Solution Approach 2:
The patent changes the priority metric parameter for CSG users by introducing a weight factor that modifies their priority calculation. This parameter change allows the existing scheduling mechanism to naturally prioritize CSG users without requiring a complete system redesign, thus improving QoS while maintaining reasonable complexity.
2Reliability
If CSG users are prioritized over N-CSG users in resource allocation, then QoS for CSG users is improved, but resource allocation complexity increases and fairness among all users may be compromised
Solution Approach 1:
The patent implements dynamic priority metric modification where the weight factor for CSG users can be adjusted based on network conditions, traffic load, and QoS requirements. This dynamic approach allows the system to prioritize CSG users when needed while maintaining flexibility to adapt to changing conditions, balancing QoS improvement with operational simplicity.
Solution Approach 2:
The scheduling mechanism incorporates feedback from QoS requirements, channel conditions, and traffic patterns to dynamically adjust priority metrics. This feedback loop ensures that CSG user prioritization is applied appropriately without excessive complexity, as the system automatically adapts to maintain fairness while prioritizing where necessary.
3Productivity
If priority metric is modified using weight index to control user selection, then CSG user throughput is optimized, but computational overhead on eNB increases
Solution Approach 1:
The patent applies partial action by modifying priority metrics only for CSG users rather than reprocessing all user scheduling decisions. The weight factor is selectively applied to CSG user priority calculations, optimizing CSG throughput while minimizing additional computational overhead compared to a complete rescheduling approach.
Solution Approach 2:
The patent changes the priority metric parameter by introducing a multiplicative weight factor for CSG users. This simple parameter modification allows throughput optimization through straightforward arithmetic operations rather than complex recomputations, thereby limiting the increase in processing overhead on the eNB.
4Productivity
If multiple UEs are scheduled per TTI with CSG awareness, then resource utilization is improved, but scheduling complexity and measurement requirements increase
Solution Approach 1:
The patent extends the existing priority metric calculation framework to handle both CSG and N-CSG users within a unified scheduling mechanism. The same priority metric structure and TTI-based scheduling process are used for all users, with the added capability of differentiating CSG users through weight factors. This universal approach improves resource utilization across all users while avoiding the need for separate scheduling systems.
Solution Approach 2:
The patent segments users into CSG and N-CSG groups and applies different weight factors to each segment's priority calculation. This segmentation allows the system to handle multiple UEs per TTI with CSG awareness by treating each user group appropriately within the same scheduling framework, improving resource utilization without requiring entirely separate measurement and scheduling systems.
Data Source
Figure 1~2A
Figure 2B~3A
Figure 3B
AI summary
This disclosure provides a method for CSG aware scheduling in a wireless network. The method includes determining, by a base station, a priority for each of CSG users and N-CSG users in a time domain based on a plurality of parameters. Further, the method includes changing, by the base station, the priority for each of the CSG users and the N-CSG users using a weight value. Further, the method includes allocating, by the base station, RBs to the CSG users and the N-CSG users based on the changed priority for each of the CSG users and the N-CSG users.