HARQ-ACK Codebook Timing for Variable-Duration Carrier Aggregation
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Solution Overview
Problem
Existing wireless communication systems struggle to support transmissions with variable durations on different cells, particularly in 5G networks, leading to inefficiencies in multiplexing, carrier aggregation, and power allocation for UEs with varying bandwidth reception capabilities.
Innovation Solution
Implementing a solution that enables multiplexing for physical downlink control channel (PDCCH) transmissions with variable durations on different cells, utilizing carrier aggregation (PDSCH) transmissions, implementing a hybrid automatic repeat request acknowledgement (HARQ) codebook for carrier aggregation (PDSCH) transmissions, implementing a transmission power control process for simultaneous traffic services, supporting simultaneous transmissions from a first duration to a second duration on different durations on different durations, defining prioritization mechanisms for power allocation from a user equipment (UE) to a base station (gNB), and implementing a power allocation method for overlapping transmissions on first one or more cells using a first duration and on second one or more cells using a second duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation is implemented with variable transmission durations on different cells, then system adaptability and support for multiple traffic services are improved, but device complexity and power control mechanisms become more complex
Solution Approach 1:
The patent implements dynamic transmission durations for PDSCH on different cells, where the duration can vary based on traffic service requirements. The system dynamically adjusts the number of slots for transmission on each cell, allowing flexible adaptation to different service types (e.g., eMBB, URLLC) while maintaining manageable complexity through standardized control mechanisms.
Solution Approach 2:
The patent changes the parameter of transmission duration (number of slots) for PDSCH on different cells. By allowing this parameter to vary independently on each cell while maintaining other parameters standardized, the system achieves adaptability for multiple traffic services without proportionally increasing overall system complexity.
2Productivity
If simultaneous transmissions with different durations are supported on different cells, then productivity and resource utilization are improved, but transmission coordination and timing synchronization become more difficult
Solution Approach 1:
The patent segments the transmission resources by cell, allowing each cell to have independent transmission duration configurations. This segmentation enables simultaneous transmissions with different durations on different cells while simplifying coordination by treating each cell's timing independently through standardized control mechanisms.
Solution Approach 2:
The patent introduces cell-specific duration dimensions while maintaining system-wide synchronization on a higher timescale. Each cell can operate with different transmission durations (adding a dimension of flexibility) while the system maintains overall timing coordination through standardized slot structures and synchronization mechanisms.
3Use of energy by moving object
If power allocation is optimized for UEs with varying bandwidth reception capabilities, then energy efficiency is improved, but power control process complexity increases
Solution Approach 1:
The patent applies local quality by configuring different transmission durations and power levels for different cells based on their specific traffic service requirements and UE capabilities. Each cell's power allocation is optimized locally for its specific function (e.g., longer duration for eMBB, shorter for URLLC) while the overall power control process remains manageable through standardized procedures.
Data Source
AI summary
A method of a user equipment (UE) for constructing a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook. The method comprises receiving physical downlink control channels (PDCCHs) that convey respective downlink control information (DCI) formats, wherein each DCI format includes a counter field and a slot offset field, receiving physical downlink data channels (PDSCHs) that convey data transport blocks, detecting the DCI formats configuring the received PDSCHs, determining locations for HARQ-ACK bits in a HARQ-ACK codebook based on a value of the slot offset field and a value of the counter field in each detected DCI format, determining a time unit for transmission of the HARQ-ACK codebook based on a value of the slot offset field in each detected DCI format, and transmitting the HARQ-ACK codebook.