LC-MTC Uplink Control Collision Handling via Timing Adjustment
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Solution Overview
Problem
Machine type communication (MTC) devices operating in coverage enhancement mode experience frequent collisions between Physical Uplink Control Channel (PUCCH) and Physical Uplink Shared Channel (PUSCH) transmissions due to high repetition rates, which affects spectrum efficiency and requires innovative collision handling mechanisms.
Innovation Solution
The MTC UE employs collision handling techniques such as adjusting transmission timing, piggybacking PUCCH onto PUSCH, pausing PUSCH transmission to allow PUCCH, and joint encoding to manage collisions effectively, ensuring reliable data and control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high repetition rates are used for coverage enhancement, then coverage is improved, but collision between PUCCH and PUSCH transmissions increases
Solution Approach 1:
The patent implements dynamic collision handling by adjusting transmission parameters based on detected collisions. When PUCCH and PUSCH repetitions are detected to collide, the system dynamically modifies the transmission scheme by pausing PUSCH repetitions or adjusting timing, thereby adapting the transmission behavior to avoid harmful interference while maintaining coverage enhancement benefits
Solution Approach 2:
The system performs preliminary collision detection by comparing repetition patterns and timing of PUCCH and PUSCH before transmissions occur. By detecting potential collisions in advance and determining collision patterns, the system can proactively adjust transmission parameters to prevent harmful interference rather than reacting after damage occurs
2Reliability
If PUCCH and PUSCH are repeated for coverage enhancement, then reliability is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The patent applies partial repetition by transmitting only the necessary number of PUSCH repetitions before pausing to transmit PUCCH repetitions. Instead of continuously repeating both channels independently, the system performs partial PUSCH repetitions, then pauses to complete PUCCH transmissions, thereby reducing total repetition overhead while maintaining required reliability
Solution Approach 2:
The system merges PUCCH and PUSCH transmissions by coordinating their repetition patterns and timing. When collisions are detected, the system combines the transmission schedules to ensure both control and data information are transmitted reliably without excessive redundancy, thereby improving spectrum efficiency while maintaining coverage enhancement
3Object-generated harmful factors
If PUSCH transmission is paused to allow PUCCH, then collision is reduced, but transmission time increases
Solution Approach 1:
The patent implements periodic transmission patterns where PUSCH repetitions are paused at predetermined intervals to allow PUCCH repetitions to transmit. This periodic structure creates regular transmission cycles that balance collision avoidance with time efficiency, preventing excessive delays while ensuring control information is transmitted reliably
Data Source
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AI summary
In one example embodiment, the machine type communication device includes a processor configured to determine whether a first uplink control channel and a second uplink control channel will collide during a transmission from the machine type communication device to the communication network, and adjust the transmission of the second uplink control channel relative to the first uplink control channel if the processor determines that the first and second control channels will collide.