Subslot Bundling for ACK/NACK Feedback in Mixed Traffic
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and 5G networks, face challenges in managing interference and optimizing data transmission to ensure reliable communication between base stations and user equipment, especially when dealing with mixed traffic types like eMBB and URLLC, which require different latency and error rate constraints.
Innovation Solution
The solution involves configuring subframes with subslots to puncture and bundle different types of data or control information, allowing for efficient ACK/NACK feedback and power management to mitigate interference, where ACK/NACK information is carried on specific channels like the UCB channel, enabling rescheduling of data transmission to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted at high power level to ensure reliable reception, then reliability is improved, but interference to other transmissions increases
Solution Approach 1:
The system uses periodic transmissions with alternating power levels - high power for initial transmission, low power for retransmissions. This periodic variation in power level allows reliable data delivery while reducing interference during retransmission phases, resolving the contradiction between reliability and interference generation.
Solution Approach 2:
The transmission power parameter is dynamically changed based on transmission status. The system transitions from high power level for initial transmission to low power level for retransmissions, and adjusts power based on feedback received. This parameter adaptation enables reliable communication while minimizing interference to other transmissions.
2Object-generated harmful factors
If retransmission power is reduced to minimize interference, then interference is reduced, but data transmission reliability deteriorates
Solution Approach 1:
The system implements feedback mechanisms where receivers send acknowledgment signals (ACK/NACK) to transmitters. This feedback enables the transmitter to adapt retransmission power levels - using low power when interference reduction is prioritized while maintaining reliability through intelligent power adjustment based on reception status information.
Solution Approach 2:
The transmission power is made dynamic rather than static. The system adjusts power levels based on transmission round, feedback received, and channel conditions. This dynamic adaptation allows the system to use low power for retransmissions while maintaining reliability through intelligent power management and adaptive adjustments.
3Object-generated harmful factors
If different power levels are used for different data groups to reduce interference, then interference is reduced, but system complexity increases
Solution Approach 1:
The system segments data transmissions into distinct groups (initial transmission and retransmissions) with assigned power levels. Each data group is handled with specific power level rules - high power for initial, low power for retransmissions. This segmentation simplifies power management complexity by establishing clear, rule-based power level assignments for different transmission phases.
Data Source
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Figure 2A~2D
Figure 3
AI summary
A first apparatus may puncture, in at least two subslots, a first type of data or control information with a second type of data or control information. The first apparatus may bundle the least two subslots within a subframe, and the subframe may include a portion for carrying acknowledgment (ACK) / negative acknowledgment (NACK) information associated with the second type of data or control information. The first apparatus may communicate with a user equipment (UE) during the at least two subslots within the subframe. A second apparatus may receive ACK/NACK information associated with a second type of data or control information. The second apparatus may reduce a transmission power for a first type of data or control information during a subsequent subframe when the ACK/NACK information indicates a negative acknowledgement.