Uplink Transmission Rate Control in Mobile Communication Systems
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Solution Overview
Problem
Conventional mobile communication systems face challenges in rapidly controlling uplink user data transmission rates due to increased processing load and delay in radio network controllers, leading to inefficient use of radio resources and increased costs, especially during burst data transmissions.
Innovation Solution
A transmission rate control method where a radio base station determines and notifies a mobile station of a maximum allowable transmission rate based on the data amount in its buffer, using a transmission rate control channel, to avoid excessive power consumption and resource wastage, by calculating a granted value that does not exceed the maximum allowable value or increment, and only notifies changes when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radio network controller integrally controls multiple radio base stations to determine transmission rates, then the transmission rate can be determined considering multiple factors (radio resource, interference, transmission power, processing performance, application requirements), but the processing load and processing delay in the radio network controller increase, making fast control (per 1-100 ms) difficult
Solution Approach 1:
The patent divides the transmission rate control function into two parts: the radio network controller determines the maximum allowable transmission rate based on system-level factors (radio resources, interference, power constraints), while the radio base station performs real-time control based on buffer status. This segmentation allows the radio network controller to focus on strategic rate determination without handling real-time control delays, while the base station handles tactical adjustments locally and immediately.
Solution Approach 2:
The patent introduces the radio base station as an intermediary between the radio network controller and mobile stations for transmission rate control. The radio network controller communicates the maximum allowable rate to the base station, which then enforces this constraint while performing real-time buffer-based adjustments. This intermediary structure distributes the control load and reduces end-to-end delay.
2Reliability
If the radio network controller determines transmission rates considering multiple constraints, then the transmission rate determination becomes accurate and reliable, but the device complexity and operational costs increase substantially
Solution Approach 1:
The patent segments the control apparatus complexity between two entities: the radio network controller handles high-level policy determination (reliability-critical functions), while the radio base station handles real-time enforcement and buffer management (operational functions). This segmentation reduces the complexity burden on any single apparatus while maintaining overall system reliability through coordinated operation.
3Speed
If radio resources are reserved for high-speed communications to handle burst traffic, then fast transmission is enabled, but the radio bandwidth resources and hardware resources in the radio base station are wasted when resources remain unoccupied
Solution Approach 1:
The patent implements dynamic transmission rate adjustment where the granted value is continuously adapted based on the mobile station's buffer status. During burst traffic, the system can quickly increase transmission rates by notifying larger granted values. During low-traffic periods, rates are reduced to minimize resource consumption. This dynamic approach eliminates the need for static resource reservation while maintaining fast response capability.
Solution Approach 2:
The patent establishes a feedback loop where mobile stations report buffer status to radio base stations, which adjust granted values accordingly. This feedback mechanism enables the system to respond to actual traffic demands in real-time, allocating resources during bursts and releasing them during idle periods, thereby avoiding both the delays of slow control and the wastage of reserved resources.
4Productivity
If the transmission rate is increased to handle burst data transmission efficiently, then the transmission efficiency improves, but the transmission power increases drastically causing resource wastage and potential interference
Solution Approach 1:
The patent implements dynamic transmission power control by adjusting the granted value based on buffer status. Instead of maintaining high power levels continuously, the system dynamically scales power consumption to match actual data transmission needs. During bursts, power is increased to maximize efficiency; during idle periods, power is reduced to minimize energy waste and interference.
Data Source
AI summary
A transmission rate control method including: notifying, from the mobile station UE to the radio base station NodeB, a data amount in a transmission buffer of the mobile station UE; determining, at the radio base station NodeB, a maximum allowable value that can be notified to the mobile station UE, in accordance with the data amount in the transmission buffer; calculating, at the radio base station NodeB, as a granted value to be notified to the mobile station UE, a value that does not exceed the maximum allowable value, notifying, from the radio base station Node B to the mobile station UE, the granted value calculated at the radio base station UE, by using a transmission rate control channel; and transmitting, at the mobile station UE, the uplink user data, at a transmission rate corresponding to the granted value notified from the radio base station NodeB.