Uplink Scheduling for Interference Management in Mobile Systems
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Solution Overview
Problem
In mobile telecommunication systems, the increased number of uplink signals from user equipment (UEs) leads to interference, reducing reception performance at Node B, as the signals do not maintain orthogonality, necessitating power adjustments that further exacerbate interference and limit the number of receivable signals.
Innovation Solution
Implementing a method and apparatus for scheduling uplink packet transmission that reports buffer status and scheduling information using priority queues to efficiently assign radio resources based on quality of service, allowing Node B to manage data rates and transmission powers dynamically, ensuring optimal resource allocation and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of uplink signals from user equipment increases, then the system capacity and data throughput improve, but the reception performance at Node B deteriorates due to interference
Solution Approach 1:
The patent implements dynamic scheduling at Node B that continuously adjusts the data rates and transmission parameters of uplink signals based on current channel conditions and interference levels. This allows the system to adaptively manage the number of simultaneous uplink transmissions, optimizing system capacity while maintaining reception performance through real-time parameter adjustments.
Solution Approach 2:
The patent changes key transmission parameters including data rate, transmission power, and resource allocation dynamically. By adjusting these parameters based on channel quality and interference conditions, the system can accommodate more uplink signals when conditions permit while maintaining reception performance when interference becomes problematic.
2Reliability
If uplink transmission power is increased to overcome interference, then the reception performance of specific UE improves, but interference to other signals increases
Solution Approach 1:
The patent applies local quality by assigning different transmission powers and data rates to different user equipments based on their specific channel conditions and distances from Node B. Instead of uniformly increasing power for all UEs, each UE receives customized power allocation, improving its own reception performance without unnecessarily increasing interference to others.
Solution Approach 2:
The patent implements dynamic power control where transmission power is continuously adjusted based on real-time channel conditions, interference levels, and quality of service requirements. This allows the system to increase power only when and where necessary, minimizing overall interference while maintaining reception performance.
3Reliability
If Node B limits the number of receivable uplink signals to ensure reception performance, then interference is reduced, but the system capacity and productivity decrease
Solution Approach 1:
The patent implements dynamic scheduling that continuously monitors channel conditions and adjusts the number of simultaneous uplink transmissions accordingly. When channel conditions are favorable and interference is low, the system allows more uplink signals to increase capacity. When interference becomes problematic, the system dynamically reduces the number of active uplink signals to maintain reception performance.
Solution Approach 2:
The patent performs preliminary scheduling and resource allocation at Node B before uplink transmissions begin. By pre-planning resource allocation and predicting interference levels, the system can optimize the number of simultaneous transmissions to maximize capacity while staying within acceptable interference thresholds, avoiding the need for overly conservative limits.
4Device complexity
If scheduling is not performed for EUDCH packet traffic, then device complexity is reduced, but the total radio resource overhead increases and reception performance deteriorates
Solution Approach 1:
The patent segments the uplink scheduling into different components: semi-persistent scheduling for regular traffic patterns and dynamic scheduling for variable traffic. This segmentation reduces overall scheduling complexity by handling predictable traffic with simpler mechanisms while applying more complex scheduling only when necessary, maintaining reception performance without excessive complexity.
Data Source
AI summary
A method and an apparatus for reporting a buffer status of a buffer storing packet data to be transmitted by a user equipment for a scheduling assignment of an uplink packet data service in a mobile communication system supporting the uplink packet data service are disclosed. A user equipment stores packet data having a priority corresponding to a plurality of priority queues having inherent priorities and relating to at least one service, and transmits buffer status information containing queue identifiers of the priority queues and buffer payload information representing an amount of the packet data stored in the priority queues. Herein, the user equipment inserts the buffer status information into a header part of a protocol data unit for the uplink packet data service, inserts the packet data into a payload part of the protocol data unit, and then transmits the protocol data unit.