Mobile Station Downstream Transmission Rate Control via CQI Feedback
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Solution Overview
Problem
Existing mobile station technologies do not effectively restrict the upper limit of the transmission rate according to processing capacity when receiving packet data from a base station, leading to potential data overflow and increased processing demands.
Innovation Solution
Incorporating a CQI restriction unit that computes and sets an upper limit for the downstream transmission rate based on the packet buffer's reject ratio and CPU load conditions, allowing the mobile station to notify the base station of its processing capacity constraints, thereby preventing data overflow and optimizing processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mobile station receives packet data at high transmission rates from the base station, then the downstream communication speed is improved, but the processing capacity of the packet buffer and CPU becomes insufficient leading to data overflow
Solution Approach 1:
The mobile station measures the reject ratio of packet data in the packet buffer and feeds back this information to the base station via the CQI field. The base station uses this feedback to adjust the transmission rate, creating a closed-loop control system that matches transmission capacity with processing capacity, thereby preventing data overflow while maintaining high-speed communication.
Solution Approach 2:
The invention dynamically adjusts the transmission rate based on real-time processing conditions. The mobile station continuously monitors the reject ratio and modulates the CQI value accordingly, enabling the transmission rate to adapt to changing processing capacities of the packet buffer and CPU, thus resolving the contradiction between speed and processing capacity.
2Productivity
If the mobile station increases processing capacity to handle higher transmission rates, then the downstream communication speed is improved, but the device size and power consumption increase
Solution Approach 1:
The mobile station uses its existing CQI reporting mechanism to convey processing capacity information to the base station. By repurposing the CQI field to include reject ratio information, the system enables self-regulation of transmission rates without requiring additional hardware or power-consuming components, thus maintaining productivity while avoiding increased power consumption.
3Productivity
If the mobile station uses full processing capacity to maximize throughput, then the data processing efficiency is improved, but application processing delays increase
Solution Approach 1:
The invention accepts partial packet data rejection as a controlled mechanism to regulate transmission rates. By allowing the packet buffer to reject excess packets and using this reject ratio as feedback, the system prevents CPU overload and application delays while maintaining adequate processing efficiency for critical data, thus balancing productivity and time loss.
Data Source
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AI summary
An aspect of the invention provides a mobile station which can restrict an upper limit of a transmission rate according to a processing capacity in processing packet data received from a base station. The mobile station includes packet data retaining means 16 for tentatively retaining packet data received from a base station 100; reject ratio computation means 16 for computing a ratio of rejected packet data in the packet data retained by the packet data retaining means 16; transmission rate setting means 30 for setting an upper limit of a downstream transmission rate based on the ratio computed by the reject ratio computation means 16; and transmission rate notification means 25 for notifying the base station 100 of the upper limit of the transmission rate set by the transmission rate setting means 30.