Mobile Station Transmission Rate Control via Primary Allowable Rate Notification
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Solution Overview
Problem
Conventional mobile communication systems face difficulties in rapidly changing transmission rates due to processing load and delay, leading to inefficient data transmission during burst traffic, resulting in low-speed and 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 adjust the rate based on the Absolute 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 (per 1-100ms)
Solution Approach 1:
The patent segments the transmission rate control function by dividing it into two parts: the radio network controller determines the primary allowable transmission rate (macro-control), while the radio base station determines the actual transmission rate based on scheduling grants (micro-control). This segmentation allows fast local response at the base station while maintaining overall network coordination at the controller level, resolving the contradiction between control accuracy and response speed.
Solution Approach 2:
The radio network controller performs preliminary action by determining and notifying the primary allowable transmission rate in advance (at call setup timing). This preliminary rate determination enables the mobile station to prepare for transmission without waiting for each scheduling grant, reducing control delay while maintaining network-level resource management.
2Device complexity
If the transmission rate control is performed at a slower order (few hundred ms to few seconds), then processing load is reduced, but data transmission efficiency decreases during burst traffic
Solution Approach 1:
The patent implements dynamic transmission rate control by enabling the mobile station to adjust its transmission rate within the primary allowable range based on real-time buffer status and channel conditions. The mobile station can perform dynamic E-TFC selection and transmit data immediately when buffer becomes full, without waiting for scheduling grants, thereby achieving fast response to burst traffic while keeping the control system relatively simple.
3Speed
If radio resources are reserved for high-speed communications to handle burst data, then data transmission speed improves, but radio bandwidth resources and hardware resources are wasted in unoccupied states
Solution Approach 1:
The patent changes the transmission rate parameter dynamically within the primary allowable range based on actual traffic conditions. The mobile station can transmit at higher rates during burst traffic and lower rates during idle periods, eliminating the need to reserve fixed high-speed resources. This parameter adjustment enables efficient resource utilization while maintaining the capability for high-speed transmission when needed.
4Reliability
If the mobile station waits for scheduling grant before transmitting data, then transmission rate control is maintained, but transmission delay increases
Solution Approach 1:
The patent applies partial action by allowing the mobile station to transmit data partially (within the primary allowable rate) without waiting for scheduling grants. The mobile station performs autonomous transmission up to the notified primary rate, and the base station performs partial control through scheduling grants to adjust the rate within that primary range. This partial autonomous action reduces transmission delay while maintaining sufficient rate control.
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 Absolute Grant Channel transmitted from a radio base station.