PUCCH Format 3 Resource Allocation via Dynamic SRS Detection
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Solution Overview
Problem
In LTE systems, the varying resource needs for PUCCH format 3 due to the use of normal or shortened formats lead to suboptimal resource utilization and increased system capacity and throughput challenges, particularly when SRS are transmitted, resulting in overprovisioning of resources.
Innovation Solution
A method in user equipment to identify resources for PUCCH format 3 transmission within a confined set of PRBs, regardless of whether a normal or shortened format is used, by receiving a resource index from the serving radio base station, ensuring consistent resource allocation across subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overprovisioning of PUCCH format 3 resources is performed to handle varying resource needs, then resource allocation reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation where the PUCCH format 3 resource block assignment changes based on whether SRS transmission occurs in the subframe. When SRS is transmitted, a first resource block assignment is used; when SRS is not transmitted, a second resource block assignment is used. This dynamic adaptation eliminates the need for static overprovisioning while ensuring reliable resource allocation in all scenarios.
Solution Approach 2:
The patent changes the resource block assignment parameter based on SRS transmission conditions. By detecting whether SRS is transmitted in the subframe, the system selects between different resource block assignments, thereby adapting the resource allocation parameters to current system conditions and avoiding both overprovisioning and resource conflicts.
2Reliability
If varying resource blocks are assigned for PUCCH format 3 based on SRS transmission, then resource conflict avoidance is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary detection of SRS transmission status in the subframe before assigning PUCCH format 3 resources. By determining in advance whether SRS will be transmitted, the system can proactively select the appropriate resource block assignment, avoiding resource conflicts between PUCCH format 3 and SRS transmissions without requiring complex real-time arbitration mechanisms.
Solution Approach 2:
The system uses the existing SRS transmission detection capability to automatically determine the appropriate PUCCH resource allocation. The base station leverages its existing knowledge of SRS scheduling and transmission patterns to self-determine the correct resource block assignment, eliminating the need for additional complex coordination protocols or external control mechanisms.
Data Source
AI summary
A user equipment and a method for identifying a resource to use for a transmission of control information on a physical uplink control channel, PUCCH, format 3 involve receiving a resource index from a serving radio base station, and identifying the resource to use for the transmission of the control information in a subframe based on the received resource index, wherein the identified resource is within a same confined set of physical resource blocks regardless of if a normal or a shortened PUCCH format 3 is used in the subframe.