PUCCH Resource Identification for Deferred ACK/NACK Transmission
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Solution Overview
Problem
In wireless communication systems, resources allocated for the transmission of acknowledgment/negative acknowledgment (ACK/NACK) feedback often collide with downlink resources, preventing the successful transmission of feedback.
Innovation Solution
The method involves monitoring for semi-persistently scheduled (SPS) physical downlink shared channels (PDSCH) and identifying a second resource for transmitting the physical uplink control channel (PUCCH) with acknowledgment feedback, based on parameters associated with the initial resource identifier (PRI) or an alternative PRI, to avoid collisions with downlink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the initially allocated PUCCH resource is used for transmitting ACK/NACK feedback, then the feedback transmission follows the original resource allocation plan, but the transmission fails when the resource collides with downlink resources
Solution Approach 1:
The patent performs preliminary collision detection between the initially allocated PUCCH resource and downlink resources before feedback transmission. By identifying potential collisions in advance, the system can proactively select alternative resources, thereby ensuring reliable feedback transmission while managing complexity through structured resource identification procedures
Solution Approach 2:
The patent introduces an intermediary mechanism (alternative PUCCH resource selection based on PRI parameters) that mediates between the conflicting requirements of following the original resource allocation plan and avoiding downlink resource collisions. This intermediary approach allows the system to maintain reliability by providing a fallback path when collisions are detected
2Reliability
If an alternative PUCCH resource is selected to avoid collision with downlink resources, then feedback transmission reliability is improved, but transmission latency increases due to resource reidentification
Solution Approach 1:
The patent performs preliminary identification of alternative PUCCH resources based on PRI parameters before actual feedback transmission is needed. By pre-establishing alternative resource options and their associated parameters, the system minimizes the time required for resource reidentification when collisions are detected, thus reducing overall latency while maintaining reliability
Solution Approach 2:
The patent utilizes parameter changes in the PRI (PUCCH Resource Identifier) to systematically identify alternative resources. By modifying PRI parameters according to defined rules, the system can quickly determine alternative resources without extensive search procedures, thereby reducing the time loss associated with resource reidentification
3Ease of operation
If the original PUCCH resource allocation is strictly followed, then resource allocation simplicity is maintained, but resource collisions with downlink resources prevent successful feedback transmission
Solution Approach 1:
The patent introduces an intermediary collision detection and resolution mechanism that operates between the simple original resource allocation plan and the actual feedback transmission. This intermediary layer checks for collisions and activates alternative resource selection only when necessary, thereby maintaining ease of operation for normal cases while ensuring reliability when collisions occur
Solution Approach 2:
The patent applies local quality by maintaining the simple original resource allocation for the majority of cases where no collision occurs, and only activating the more complex alternative resource selection process locally when collisions are detected. This approach preserves ease of operation for typical scenarios while ensuring reliability for exceptional collision cases
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for determining resources to use for deferred transmission of acknowledgment feedback. An example method generally includes monitoring for a semi-persistently scheduled (SPS) physical downlink shared channel (PDSCH); determining that a first resource, identified by a first physical uplink control channel (PUCCH) resource identifier (PRI), for transmitting a physical uplink control channel (PUCCH) with acknowledgment feedback for the SPS PDSCH collides with a downlink resource; identifying a second resource for transmitting the PUCCH based on parameters associated with the first PRI or a second PRI; and transmitting the PUCCH on the second resource.