PUCCH Resource Allocation in 3GPP Uplink Control
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Solution Overview
Problem
The existing 3GPP communication systems face inefficiencies in resource utilization and increased complexity due to limited PUCCH resources and the need to decode multiple physical channels for uplink control data transmission, particularly in scenarios where PUCCH resources are not actively used.
Innovation Solution
The proposed solution dynamically assigns PUCCH resources based on the type of scheduling used for each UE, allowing unused PUSCH resources to be utilized for uplink control information transmission, and eliminates the need for PUCCH resources during persistent scheduling by transmitting CQI, PMI, and HARQ data on the PUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH resources are allocated for uplink control information transmission, then control data can be transmitted reliably, but PUCCH resource capacity is limited and system overall capacity is constrained
Solution Approach 1:
The patent combines control information transmission with user data transmission by embedding CQI, PMI, and HARQ data within PUSCH transmissions. This merging eliminates the need for separate PUCCH resources when user data is being transmitted, thereby increasing overall system capacity while maintaining reliable control data transmission through the existing PUSCH channel.
Solution Approach 2:
The PUSCH channel is given multi-functionality by enabling it to carry both user data and uplink control information simultaneously. This universal approach allows the same physical channel to serve multiple purposes, reducing the need for dedicated PUCCH resources and improving resource utilization efficiency.
2Adaptability or versatility
If control information is transmitted on different physical uplink channels (PUCCH or PUSCH), then flexibility is provided, but base station complexity increases due to needing to decode both channels
Solution Approach 1:
The patent merges control information and user data into a single PUSCH transmission, eliminating the need for the base station to decode separate PUCCH and PUSCH channels. This reduces base station complexity while maintaining the flexibility to adapt to different transmission scenarios through configurable rules about when to use PUSCH for control information.
Solution Approach 2:
The patent extracts control information from the separate PUCCH channel and integrates it directly into the PUSCH channel. This extraction eliminates the need for dual-channel decoding at the base station, simplifying the receiving end while preserving the adaptability to choose appropriate transmission modes.
3Reliability
If PUCCH resources are allocated for all UEs, then control information transmission is ensured, but resource wastage occurs when PUCCH resources are not actively used
Solution Approach 1:
The patent implements a dynamic resource allocation strategy where the use of PUCCH versus PUSCH for control information is determined based on real-time conditions such as whether the UE has uplink data to transmit. This dynamic approach ensures control information transmission reliability while eliminating resource wastage by allocating PUCCH resources only when necessary.
Solution Approach 2:
The system enables UEs with uplink data transmissions to self-serve their control information needs by transmitting both data and control information on PUSCH. This self-service mechanism eliminates the need for dedicated PUCCH resources in these cases, reducing resource wastage while maintaining transmission reliability through the existing data channel.
Data Source
AI summary
In a 3rd Generation Partnership Project, 3GPP, communication system a base station comprises a scheduler allocating communication resource of at least one of a Physical Uplink Shared CHannel, PUSCH, and a Physical Downlink Shared CHannel, PDSCH to a User Equipment (UE). The scheduling may either be a dynamic scheduling wherein a resource allocation for a single frame is provided to the UE or a persistent scheduling wherein a resource allocation for a plurality of frames is provided to the UE. A resource allocator assigns resource of a Physical Uplink Control CHannel, PUCCH, to the UE dependent on whether dynamic scheduling or persistent scheduling is performed by the scheduler for the UE. The UE transmits uplink control data on a physical uplink channel which is selected as the PUCCH or the PUSCH in response to whether persistent scheduling is used for the UE. The invention allows e.g. reduced PUCCH loading.