HARQ Feedback Resource Reuse for Undefined DCI Scheduling
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Solution Overview
Problem
In wireless communication systems, particularly in the unlicensed band of 5G networks, there is a challenge in ensuring that feedback information, such as hybrid automatic repeat request (HARQ) responses, can be reliably transmitted from terminals to base stations without additional signaling procedures when the transmission resources are undefined.
Innovation Solution
The method involves using downlink control information (DCI) to schedule physical downlink shared channels (PDSCH) and HARQ responses, allowing terminals to transmit HARQ responses using resource information from a subsequent DCI when the initial resource is undefined, and employing HARQ codebooks organized by PDSCH groups to manage these transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transmission resource information of HARQ response is configured as undefined in DCI, then the device complexity is reduced by avoiding separate signaling procedures, but the reliability of HARQ response transmission cannot be guaranteed without additional signaling
Solution Approach 1:
The base station pre-configures multiple candidate transmission resources for HARQ responses through higher layer signaling (RRC signaling) before actual data transmission. When DCI indicates undefined transmission resource information, the terminal can select from these pre-configured candidate resources, eliminating the need for dynamic signaling while ensuring reliable transmission.
Solution Approach 2:
A set of candidate transmission resources acts as an intermediary between the DCI scheduling information and the actual HARQ response transmission. This intermediary layer allows the system to avoid direct signaling for each HARQ response while maintaining transmission reliability through pre-established resource pools.
2Adaptability or versatility
If multiple PDSCHs are scheduled with different HARQ response resources, then the adaptability of the system is improved, but the device complexity increases due to resource management overhead
Solution Approach 1:
Multiple candidate transmission resources are configured to serve multiple PDSCH groups, allowing a single resource configuration to handle diverse scheduling scenarios. The same set of candidate resources can be reused across different PDSCH groups and transmission occasions, reducing overall system complexity while maintaining flexibility.
Solution Approach 2:
The system divides PDSCHs into different groups (PDSCH group 0, PDSCH group 1, etc.) with each group associated with specific candidate transmission resources. This segmentation allows independent management of resources for different PDSCH groups while maintaining overall system adaptability.
Data Source
AI summary
Disclosed are a method and an apparatus for transmitting or receiving feedback information in a communication system. An operation method of a terminal comprises the steps of: receiving, from a base station, DCI #1 including scheduling information of PDSCH #1 and transmission resource information of HARQ response #1 with respect to PDSCH #1; receiving, from the base station, DCI #2 including scheduling information of PDSCH #2 and transmission resource information of HARQ response #2 with respect to PDSCH #2; and when the transmission resource information of HARQ response #1 is configured as undefined, transmitting, to the base station, 10 HARQ response #1 and HARQ response #2 by using a resource indicated by the transmission resource information of HARQ response #2. Therefore, the performance of the communication system can be improved.