CoMP Uplink Timing Control for Interference Reduction
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Solution Overview
Problem
In wireless communication systems employing coordinated multipoint technology, the distance differences between user equipment and multiple base stations complicate the application of uniform timing for uplink signal transmission, leading to interference and decoding issues.
Innovation Solution
A method where user equipment receives separate timing advances for sounding reference signals and uplink data from each base station, allowing independent timing for each, thereby reducing interference by adjusting the transmission timing of uplink signals to each base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform timing is applied for uplink signal transmission to multiple base stations, then device complexity is reduced, but transmission reliability deteriorates due to distance differences causing interference and decoding issues
Solution Approach 1:
The patent segments the timing management by introducing separate time alignment timers (TAT1 for sounding reference signal, TAT2 for uplink data) and separate timing advance values (TA1, TA2) for different uplink signals. This allows independent timing control for each signal type transmitted to different base stations, resolving the contradiction between simplified device operation and reliable signal decoding under coordinated multipoint transmission.
2Reliability
If separate timing advances are applied for different uplink signals to different base stations, then transmission reliability is improved, but device complexity increases due to multiple timing management parameters
Solution Approach 1:
The patent applies local quality by assigning different timing advance values (TA1 for sounding reference signal, TA2 for uplink data) and separate time alignment timers (TAT1, TAT2) to different uplink signals based on their specific transmission requirements and target base stations. This localized timing optimization ensures each signal type is transmitted with appropriate timing for its destination, improving reliability without requiring global timing reconfiguration.
3Ease of operation
If uniform timing is used for all uplink transmissions, then ease of operation is maintained, but transmission precision deteriorates due to distance differences between user equipment and base stations
Solution Approach 1:
The patent introduces dynamic timing management where the user equipment can independently adjust timing for different uplink signals using separate time alignment timers (TAT1, TAT2) and timing advance values (TA1, TA2). This dynamic approach allows the system to adapt timing precision to specific transmission scenarios (sounding reference signal vs. uplink data) while maintaining operational simplicity through automated timer management.
4Manufacturing precision
If separate time alignment timers are implemented for different uplink signals, then transmission precision is improved, but device complexity increases due to additional timer management mechanisms
Solution Approach 1:
The patent segments the timing control mechanism by implementing separate time alignment timers (TAT1 for sounding reference signal, TAT2 for uplink data) that operate independently. Each timer manages the timing advance for its specific signal type, providing precise timing control without requiring complex inter-dependent timer coordination, thus balancing precision with manageable complexity.
Data Source
AI summary
Defined are timings at which a user equipment transmits uplink signals to a plurality of base stations in a wireless communication system to which a coordinated multipoint (CoMP) technology is applied. Specifically, a method of controlling uplink signal transmission timings to prevent collision between timings in transmission of uplink signals to the base stations is disclosed.