Uplink Transmission Rate Control via MAC Entity Segmentation
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Solution Overview
Problem
Conventional mobile communication systems face challenges in rapidly controlling uplink transmission rates due to processing load and delay, leading to inefficient data transmission and wasted radio bandwidth and hardware resources during burst data transmission.
Innovation Solution
A method for controlling uplink user data transmission rates by notifying an optimal effective period for the Absolute Grant Channel per Radio Network Temporary Identity (RNTI) to both radio base stations and mobile stations, allowing for individualized and cell-common transmission rate control, thereby enhancing uplink efficiency and radio capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the radio network controller integrally controls multiple radio base stations, then centralized control is achieved, but fast transmission rate control (within 1-100ms) becomes difficult due to processing load and delay
Solution Approach 1:
The patent segments the control function by introducing a MAC entity at the base station level that handles fast transmission rate control independently from the central RNC. This segmentation allows the RNC to maintain centralized control for resource allocation while the base station MAC entity performs rapid local adjustments without waiting for RNC instructions, thus resolving the contradiction between centralized control and fast response speed.
Solution Approach 2:
The patent adds a new control dimension by introducing transmission rate control at the MAC sub-layer (layer 2) in addition to the existing layer 3 RNC control. This dimensional expansion creates a dual-control architecture where fast MAC-level control operates parallel to slower RNC-level control, enabling both centralized management and rapid local response simultaneously.
2Productivity
If fast control for changing transmission rate is implemented, then transmission efficiency improves, but apparatus costs and operating network costs substantially increase
Solution Approach 1:
The base station MAC entity performs self-service by autonomously determining transmission rates based on local channel conditions and queue status without requiring continuous RNC intervention. This self-service capability enables fast transmission rate adjustments while avoiding the need for expensive additional RNC hardware, thus improving transmission efficiency without substantially increasing apparatus costs.
Solution Approach 2:
The patent changes the control parameter from RNC-generated layer 3 commands to base station-generated layer 2 MAC commands. This parameter change allows fast transmission rate control to be achieved through software-based MAC entity adjustments rather than hardware modifications at the RNC, thereby improving productivity while keeping device complexity and costs manageable.
3Productivity
If transmission rate is changed fast for burst data, then transmission efficiency improves, but radio bandwidth resources and hardware resources in unoccupied states are wasted
Solution Approach 1:
The base station MAC entity continuously monitors actual channel conditions, queue depth, and transmission status, using this feedback to dynamically adjust transmission rates. This feedback mechanism prevents both over-provisioning (which wastes resources) and under-provisioning (which reduces efficiency), allowing the system to optimize resource utilization in real-time for burst data transmission.
Solution Approach 2:
The patent implements dynamic transmission rate adjustment where the MAC entity can rapidly change transmission parameters based on real-time conditions. This dynamic control allows the system to adapt transmission rates to match actual data arrival patterns, preventing resource wastage during low-activity periods while maintaining high efficiency during burst transmission periods.
Data Source
AI summary
A transmission rate control method for controlling a transmission rate of uplink user data, includes: notifying, at a radio network controller, to a radio base station and a mobile station, an effective period to an Absolute Grant Channel which includes an absolute value for the transmission rate of the uplink user data, transmitting, at the radio network controller, the Absolute Grant Channel per Radio Network Temporary Identity based on the notified effective period; and determining, at the mobile station, the transmission rate of the uplink user data based on the notified effective period, when receiving the Absolute Grant Channel per Radio Network Temporary Identity from the radio base station.