Common Upper Layer Parameter for DCI Field Size in 5G MBS
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multicast/broadcast services for 5G NR, UEs cannot properly decode downlink control information (DCI) transmitted by the group common PDCCH due to unknown field sizes, as the size of fields within the DCI is not known to multiple UEs receiving MBS data.
Innovation Solution
A terminal and radio communication method where the size of at least one field in the common downlink control information is determined using a common upper layer parameter, distinct from dedicated upper layer parameters, allowing UEs to decode DCI effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a group common PDCCH is used to schedule data to multiple UEs, then data transmission efficiency is improved, but the field size in DCI becomes unknown to UEs making decoding impossible
Solution Approach 1:
The patent introduces a new parameter 'common upper layer parameter' that is specifically designed to define the field size in DCI for group common PDCCH. This parameter is configured by the network and known to all UEs in the group, allowing them to correctly decode the DCI. The parameter changes the way field size is determined from a UE-specific basis to a common group basis, resolving the decoding problem while maintaining efficient group scheduling.
2Measurement precision
If dedicated upper layer parameters are used for each UE, then individual UE configuration precision is improved, but common DCI decoding fails because field sizes differ across UEs
Solution Approach 1:
The patent segments the upper layer parameters into two distinct categories: 'common upper layer parameters' for group common PDCCH and 'dedicated upper layer parameters' for UE-specific PDCCH. This segmentation allows each type of PDCCH to use the appropriate parameter set, with common parameters ensuring uniform field sizes for group decoding while dedicated parameters maintaining individual UE configuration precision. The segmentation resolves the conflict between common decoding requirements and individual configuration needs.
Data Source
AI summary
A terminal comprises: a reception unit that receives data via a downlink channel scheduled by common downlink control information common to a plurality of terminals in data delivering to the plurality of terminals; and a control unit that determines a size of at least one of a first field among fields included in the common downlink control information based on a common upper layer parameter used in the common downlink information; wherein the common upper layer parameter is defined separately from a dedicated upper layer parameter used in a dedicated downlink information dedicated to each of the plurality of terminals.