Base Station Uplink Rate Control via Transmission Rate Decrease Data
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Solution Overview
Problem
In radio communication systems, when a large number of radio terminals are present, transmitting absolute or relative grants for uplink user data at each Transmission Time Interval (TTI) increases downlink radio resources and processing load for the base station, leading to inefficient use of uplink radio resources due to unchanged transmission rates over longer cycles.
Innovation Solution
The base station transmits transmission rate decrease data to radio terminals when uplink user data is not being used, allowing for dynamic adjustment of transmission rates based on buffer information and usage rates, thereby optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission rate control data (AG or RG) is transmitted to each radio terminal at each TTI, then transmission rate control precision is improved, but downlink radio resources consumption and base station processing load increase
Solution Approach 1:
The patent extracts and transmits only the necessary control information (transmission rate decrease data) rather than complete control data at every TTI. When uplink user data is not being transmitted, only minimal decrease data is sent, reducing downlink resource consumption while maintaining adequate control precision.
Solution Approach 2:
The patent implements periodic transmission of control data at predetermined cycles longer than one TTI, rather than continuous transmission at each TTI. This periodic approach reduces the frequency of downlink transmissions and base station processing events, lowering resource consumption and processing load while still providing regular control updates.
2Quantity of substance
If transmission of AG or RG is performed at a predetermined cycle longer than one TTI, then downlink radio resources and processing load are reduced, but transmission rate control precision deteriorates
Solution Approach 1:
The patent introduces feedback mechanisms where the base station monitors uplink transmission status and sends transmission rate decrease data when data is not being transmitted. This feedback loop ensures that even with longer control cycles, the transmission rate is properly adjusted based on actual uplink activity, maintaining control precision without requiring frequent transmissions.
Solution Approach 2:
The system uses the uplink transmission status itself as the trigger for downlink control transmissions. When uplink user data is detected as not being transmitted, this condition automatically triggers the sending of decrease data, creating a self-regulating mechanism that adapts control transmission frequency to actual network conditions.
3Device complexity
If transmission rate is maintained at the same value over a predetermined cycle, then control signaling overhead is reduced, but uplink radio resources are wasted due to improper rate assignment
Solution Approach 1:
The patent implements dynamic adjustment of transmission rate by introducing transmission rate decrease data that modifies the scheduled grant based on actual uplink transmission status. This dynamic mechanism allows the system to adapt the transmission rate to current conditions, preventing resource waste while maintaining relatively simple control signaling compared to full re-negotiation at each TTI.
Data Source
AI summary
In a radio communication system in which a radio terminal 10 transmits, to a base station 100, uplink user data via an enhanced dedicated physical data channel, the base station 100 includes a base station side transmitter unit (scheduling unit 120a) configured to transmit, to the radio terminal 10, transmission rate decrease data for instructing a decrease of the transmission rate assigned to the radio terminal 10, when the uplink user data is not transmitted from the radio terminal 10 to the base station 100 by using the transmission rate assigned to the radio terminal 10.