User Equipment Data Rate Control via Down Command Hysteresis
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Solution Overview
Problem
In WCDMA communication systems, the increase in uplink signals received at Node B leads to interference and degradation of reception performance due to unsynchronized signals from different user equipments, limiting the maximum received power level and requiring increased transmission power, which further causes interference.
Innovation Solution
A method for a user equipment (UE) to control its data rate by counting consecutive down commands from non-serving Node B radio link sets and comparing them to executed commands within a hysteresis period, allowing the UE to adjust its data rate accordingly to prevent abrupt decreases and manage uplink radio resources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power of uplink signals is increased to address interference from multiple UEs, then reception performance of individual UE signals is improved, but interference to other uplink signals increases, causing deterioration of reception performance
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the data rate parameter based on the number of active UEs and channel conditions. Instead of increasing transmission power, the system changes the data rate parameter to maintain reliable communication while controlling interference levels. The Node B monitors the number of active UEs and adjusts scheduling parameters accordingly.
Solution Approach 2:
The patent implements feedback mechanisms where the Node B monitors channel conditions and buffer states of multiple UEs, generates scheduling commands based on this feedback, and transmits them to appropriate UEs. The UE counts consecutive down commands and adjusts data rate based on this feedback loop, creating a closed-control system that balances reception performance and interference.
2Productivity
If the number of uplink signals received at Node B increases to support more UEs, then system capacity is improved, but interference to individual uplink signals increases, causing degradation of reception performance
Solution Approach 1:
The patent changes scheduling parameters based on the number of active UEs. When more UEs are active, the system adjusts data rate parameters and scheduling decisions to maintain reception performance while supporting higher system capacity. The Node B monitors active UE count and modifies scheduling commands accordingly.
Solution Approach 2:
The patent introduces dynamic data rate adjustment where the UE's data rate is not fixed but changes dynamically based on the number of consecutive down commands received. This dynamic adaptation allows the system to support varying numbers of UEs while maintaining reliable reception through real-time parameter adjustment.
3Reliability
If data rate is decreased to prevent overload in uplink radio resources, then interference is reduced and reception performance is improved, but transmission efficiency decreases
Solution Approach 1:
The patent implements dynamic data rate control where the UE adjusts its data rate based on the number of consecutive down commands received within a hysteresis period. This dynamic adjustment allows the system to optimize between reception performance and transmission efficiency by adapting the data rate to current channel conditions and system load rather than using a fixed conservative rate.
Solution Approach 2:
The UE autonomously controls its own data rate based on counting down commands received from the Node B. The UE service itself by monitoring the scheduling commands and automatically adjusting its transmission parameters without requiring explicit reconfiguration, thereby balancing reception performance and transmission efficiency.
Data Source
AI summary
An apparatus and method for controlling a data rate by a user equipment (UE) that receives a scheduling command for uplink data transmission from a non-serving Node B in a mobile communication system that transmits packet data over an uplink are provided. A scheduling command receiver receives a down command for decreasing an allowable data rate of the UE from radio link sets (RLSs) of the non-serving Node Bs. A down command reception counter counts the number of down commands received from each of the RLSs for a predetermined hysteresis period. A down command execution counter counts the number of down commands executed for the hysteresis period. A down command execution decision unit compares the number of received down commands with the number of executed down commands, and determines whether to execute the down command according to the comparison result.