Contention-Based PUSCH Resource Allocation for Low Latency
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Solution Overview
Problem
There is a need to define the Information Elements (IEs) for a DCI format supporting contention-based PUSCH transmissions for various operating bandwidths, as well as methods for assigning Resource Blocks (RBs) to these transmissions while minimizing signaling overhead and UE power consumption.
Innovation Solution
The proposed solution involves modifying the DCI format to include specific IEs for contention-based PUSCH transmissions, such as Resource Allocation (RA) and CRC scrambled with a CB-RNTI, allowing UEs to randomly select RBs or RB Groups (RBGs) for transmission, and using frequency hopping to ensure availability of resources, thereby reducing the size and complexity of the DCI format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional scheduled PUSCH transmission is used, then resource allocation is controlled and efficient, but user plane latency is high due to scheduling request and processing delays
Solution Approach 1:
The patent segments the resource allocation process by dividing the bandwidth into multiple Resource Block Groups (RBGs) that are independently allocable. This allows UEs to autonomously select specific RBGs for transmission without requiring full scheduling procedures, thereby reducing latency while maintaining controlled resource distribution through the RBG structure
Solution Approach 2:
The patent enables UEs to perform self-service by autonomously selecting RBGs for PUSCH transmission based on pre-configured parameters and DCI indications. This self-selection mechanism eliminates the need for interactive scheduling requests and grants, significantly reducing user plane latency while the DCI format maintains network control through resource availability indication
2Measurement precision
If DCI format includes detailed resource allocation information, then resource assignment precision is high, but signaling overhead increases
Solution Approach 1:
The patent applies segmentation by dividing the bandwidth into RBGs and using bitmap fields in DCI to indicate available RBGs. This segmented representation achieves precise resource allocation through compact bitmap encoding, reducing signaling overhead compared to traditional detailed resource allocation while maintaining the ability to precisely assign specific frequency resources
Solution Approach 2:
The patent implements local quality by providing different levels of allocation detail for different purposes: bitmap fields provide precise local RBG availability indication for autonomous UE selection, while maintaining overall network control. This localized precision approach reduces total signaling overhead by only providing detailed information where needed rather than comprehensive resource allocation details
Data Source
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AI summary
Methods and apparatus are provided for a User Equipment (UE) to transmit signals in response to the reception of a Downlink Control Information (DCI) format transmitted from a base station of a communication system. The DCI format may provide only the frequency resources for the transmission of signals by the UE, while other parameters associated with the transmission of signals by the UE may be either predetermined or known to the UE through other signaling from the base station. The frequency resources used for the transmission of signals by the UE may be a sub-set of the frequency resources indicated by the DCI format and the determination of this sub-set by the UE may be either deterministic or pseudo-random.