PUCCH Resource Determination via CCE Index and DCI Offset
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Solution Overview
Problem
In future radio communication systems, such as LTE Rel. 15 and 5G, user terminals face challenges in appropriately determining PUCCH resources for UCI transmission due to limitations in the number of resources that can be indicated by Downlink Control Information (DCI) fields, leading to potential misallocation of resources.
Innovation Solution
A user terminal is equipped with a transmission section for UCI transmission using an uplink control channel and a control section that determines PUCCH resources based on a resource indicator from the first DCI field and implicit values from the second DCI field, allowing for flexible allocation of PUCCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PUCCH resource sets are configured with a large number of resources (M>4) to provide flexibility in UCI transmission, then the adaptability of resource allocation is improved, but the user terminal cannot appropriately determine the PUCCH resources because the given field of DCI (2 bits) cannot indicate all resources
Solution Approach 1:
The PUCCH resource determination is segmented into two parts: explicit indication via a given field in DCI (first indication information) and implicit determination via a predetermined rule (second indication information). This segmentation allows the explicit field to indicate a subset of resources while the implicit rule provides the remaining resolution, enabling support for M>4 resources without increasing DCI field size.
Solution Approach 2:
The patent introduces an intermediary mechanism where the given field in DCI does not directly indicate the final PUCCH resource but rather provides partial indication information. The terminal uses this partial information combined with implicit rules (mediated through predetermined relationships) to determine the complete resource allocation, thus resolving the limitation of direct indication.
2Device complexity
If the given field of DCI is limited to 2 bits to maintain simple signaling overhead, then the device complexity is reduced, but the number of PUCCH resources that can be indicated is limited (M≤4)
Solution Approach 1:
The resource indication function is segmented between explicit DCI fields (maintaining 2-bit simplicity) and implicit predetermined rules. This allows the system to support larger resource sets without increasing DCI complexity, as the additional resource identification capability comes from the implicit rules rather than expanded explicit signaling.
Solution Approach 2:
The patent adds another dimension to resource indication by combining explicit field values with implicit rule-based determination. Instead of relying solely on the 2-bit field (one dimension), the system uses the field value in combination with predetermined relationships (another dimension) to achieve finer resource granularity and larger resource set support.
Data Source
AI summary
A terminal is disclosed including a receiver that receives a downlink control information; and a processor that determines a first parameter based on a control channel element (CCE) index and a field value in the downlink control information; determines, based on the CCE index, whether a second parameter is the first parameter or a sum of the first parameter and an offset; and determines an initial cyclic shift index for a physical uplink control channel (PUCCH) transmission based on the second parameter. In other aspects, a communication method for a terminal and a base station are disclosed.