Mobile Uplink Rate Control for Burst Traffic Without Grant Delay
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Solution Overview
Problem
Conventional mobile communication systems face challenges in rapidly changing transmission rates due to processing load and delay, leading to inefficient data transmission during burst traffic, resulting in low-speed, high-delay data transmission or wastage of radio resources.
Innovation Solution
A transmission rate control method where the radio network controller notifies a primary allowable transmission rate during call setup, allowing the mobile station to start data transmission below this rate without waiting for a scheduling grant, and subsequently adjusts the rate based on the Relative Grant Channel from the radio base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radio network controller integrally controls multiple radio base stations to determine transmission rates, then transmission rate control can be performed considering overall network conditions, but processing load and processing delay increase, preventing fast control (1-100ms)
Solution Approach 1:
The patent segments the transmission rate control function by separating the determination of the primary allowable transmission rate (performed by the radio network controller) from the control of transmission rate changes (performed by the radio base station). This segmentation allows the radio base station to respond quickly to burst traffic without waiting for the radio network controller, reducing processing delay while maintaining control accuracy through the hierarchical structure.
Solution Approach 2:
The patent implements preliminary action by having the radio network controller determine and notify the primary allowable transmission rate in advance during call setup. This pre-determined rate serves as a baseline that enables the mobile station to immediately transmit data when burst traffic occurs, without waiting for scheduling grants, thus reducing latency while maintaining overall network control.
2Productivity
If the transmission rate control is performed slowly (hundreds of ms to seconds), then processing load is reduced, but data transmission efficiency deteriorates during burst traffic with low-speed and high-delay
Solution Approach 1:
The radio network controller determines the primary allowable transmission rate in advance during call setup, enabling the mobile station to immediately transmit data at this rate when burst traffic occurs without waiting for scheduling grants. This preliminary determination eliminates the delay associated with real-time rate control decisions, significantly improving data transmission efficiency during burst traffic while maintaining manageable processing loads.
3Speed
If radio resources are reserved for high-speed communications to handle burst traffic, then data transmission speed improves, but radio bandwidth resources and hardware resources are wasted during unoccupied states
Solution Approach 1:
The patent implements dynamic resource allocation by allowing the mobile station to transmit data immediately at the primary allowable transmission rate when burst traffic occurs, and by enabling the radio base station to quickly adjust the transmission rate in response to scheduling requests. This dynamic approach eliminates the need for static resource reservation, allowing resources to be utilized efficiently during burst traffic while remaining available for other uses during unoccupied states, thus avoiding resource wastage.
4Reliability
If the mobile station waits for scheduling grant before transmitting data, then transmission rate control can be maintained, but transmission delay increases and instantaneous data transmission cannot be achieved
Solution Approach 1:
The radio network controller determines and notifies the primary allowable transmission rate in advance during call setup, enabling the mobile station to immediately transmit data at this rate when burst traffic occurs without waiting for scheduling grants. This preliminary determination allows instantaneous data transmission while maintaining rate control through the pre-established primary allowable transmission rate.
Solution Approach 2:
The patent implements feedback mechanisms where the mobile station transmits scheduling requests when data needs to be sent, and the radio base station responds with scheduling grants or rate adjustment commands. This feedback loop maintains transmission rate control while allowing immediate data transmission at the primary allowable rate, eliminating the delay of waiting for initial scheduling grants.
Data Source
AI summary
A transmission rate control method for controlling a transmission rate of a channel to which the transmission rate control method is applied, include: notifying, at a radio network controller, at a timing of a call setup or the like, a primary allowable transmission rate of the channel to which the transmission rate control method is applied; starting, at a mobile station, after the call setup, transmission at a transmission rate below the primary allowable transmission rate, when data to be transmitted is generated; and controlling, at the mobile station, the transmission rate of the channel to which the transmission rate control method is applied, based on an Relative Grant Channel transmitted from a radio base station.