HARQ-ACK Transmission in TDD-FDD Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LTE-A systems face challenges in transmitting HARQ-ACK information using PUCCH format 1b with channel selection in TDD-FDD Carrier Aggregation scenarios, as existing methods are not suitable for configurations where the primary serving cell adopts TDD UL-DL configurations #2, #3, and #4, limiting the applicability of PUCCH format 1b.
Innovation Solution
A method and device for determining HARQ-ACK information transmission on an UL subframe by selecting specific DL subframes from multiple serving cells, employing predefined rules to bundle and determine ACK/NACK information, allowing transmission via PUCCH or PUSCH, thereby enabling HARQ-ACK information transmission in TDD-FDD CA scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUCCH format 1b with channel selection is used to transmit HARQ-ACK information in TDD-FDD CA, then transmission efficiency is improved, but it is not compatible with TDD UL-DL configurations #2, #3, and #4
Solution Approach 1:
The patent segments the DL subframes into two groups: those that require HARQ-ACK feedback and those that do not. By identifying and excluding specific DL subframes (those with UL subframes in the corresponding feedback window) from the feedback requirement, the system can apply PUCCH format 1b to the remaining subframes, thus enabling configuration compatibility while maintaining transmission efficiency.
Solution Approach 2:
The patent introduces dynamic determination of the feedback window based on the UL-DL configuration. The set of DL subframes requiring feedback is dynamically adjusted according to the specific TDD configuration, allowing the system to adapt PUCCH format 1b to different UL-DL configurations while maintaining efficient HARQ-ACK transmission.
2Reliability
If all DL subframes are required to provide HARQ-ACK feedback, then reliability is improved, but device complexity increases due to multiple transmission modes
Solution Approach 1:
The patent extracts and identifies specific DL subframes that should be excluded from HARQ-ACK feedback requirements. By taking out the subframes that would create conflicts with UL subframes in the feedback window, the system maintains reliability for the remaining subframes while reducing the complexity of managing multiple transmission modes.
Solution Approach 2:
Instead of requiring HARQ-ACK feedback for all DL subframes, the patent applies partial action by selectively requiring feedback only for DL subframes that do not conflict with UL subframes in the feedback window. This partial feedback approach maintains sufficient reliability while reducing the complexity associated with handling all subframes uniformly.
Data Source
AI summary
Disclosed are a method and device for response information transmission, a terminal, a base station and a storage medium. The method for response information transmission includes: when a time division duplex serving cell and a frequency division duplex serving cell are performing carrier aggregation and are configured to employ a physical uplink control channel (PUCCH) format 1b with channel selection mode for transmission of hybrid automatic repeat request-acknowledgement (HARQ-ACK) response information, determining HARQ-ACK response information transmitted on an uplink subframe by a first serving cell and a second serving cell, and transmitting the determined HARQ-ACK response information via a PUCCH or a physical uplink shared channel (PUSCH).