RBW-RedCap UE Decoding Overlapping PDSCHs
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Solution Overview
Problem
Current 5G NR networks face challenges in supporting reduced-capability user equipment (UEs) with lower cost, complexity, and energy consumption, particularly in industrial wireless sensor network use cases.
Innovation Solution
The implementation of reduced-bandwidth (RBW) reduced-capacity (RedCap) UEs, which prioritize decoding of physical downlink shared channels (PDSCHs) and limit the number of allocated physical resource blocks (PRBs) to reduce processing complexity and enhance energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reduced-bandwidth RedCap UEs are implemented to lower cost and complexity, then device complexity and energy consumption are reduced, but the ability to decode overlapping PDSCHs is limited
Solution Approach 1:
The patent segments the decoding process by introducing a determination step that divides PDSCHs into decodable and non-decodable categories based on overlap criteria. This segmentation allows the RBW-RedCap UE to focus processing resources on manageable subsets of PDSCHs, reducing overall processing complexity while maintaining reliable decoding for selected channels.
Solution Approach 2:
The patent applies partial action by implementing selective decoding rather than attempting to decode all PDSCHs. The UE performs decoding operations on only those PDSCHs that meet the non-overlap criteria, accepting that some PDSCHs will not be decoded. This partial approach reduces processing complexity and energy consumption while maintaining sufficient reliability for the decoded portion.
2Device complexity
If the UE prioritizes decoding of one PDSCH over another when PRB allocation exceeds bandwidth, then processing complexity is reduced, but data reception completeness is compromised
Solution Approach 1:
The patent changes the parameter of decoding priority by introducing a determination mechanism that evaluates PDSCH overlap characteristics. Based on this evaluation, the UE dynamically adjusts which PDSCHs to decode, effectively changing the decoding parameter set to match its bandwidth constraints. This allows the UE to manage processing complexity while minimizing information loss through intelligent selection.
Solution Approach 2:
The patent introduces an intermediary determination step between PDSCH reception and decoding. This intermediary evaluates whether PDSCHs overlap in time and determines decodability based on PRB allocation versus available bandwidth. This intermediary mechanism mediates between the incoming data streams and the UE's processing capabilities, reducing complexity while preserving data reception for compatible channels.
3Use of energy by moving object
If RBW-RedCap UE limits PRB allocation to available bandwidth, then energy consumption is reduced, but the number of decodable PDSCHs is restricted
Solution Approach 1:
The patent implements dynamic adaptivity by making the UE's decoding behavior contingent on real-time evaluation of PDSCH overlap and bandwidth availability. The determination mechanism dynamically identifies which PDSCHs can be decoded within the RBW constraints, allowing the system to adapt its data reception capacity to match available energy resources while maximizing throughput within those constraints.
Solution Approach 2:
The patent accepts partial data reception by selectively decoding only those PDSCHs that fit within bandwidth and energy constraints. Rather than attempting to decode all transmitted PDSCHs, the UE performs partial decoding on a subset, reducing energy consumption while maintaining productivity for the decoded portion. This partial action approach balances energy efficiency with data throughput.
Data Source
AI summary
A UE configured for operating in a 5G NR network may decode signalling that schedules two physical downlink shared channels (PDSCHs) in a same time slot. When the UE is a reduced-bandwidth (RBW) reduced-capacity (RedCap) UE (RBW-RedCap UE), the UE may determine if a total number of allocated PRBs in an OFDM symbol for the two scheduled PDSCHs exceed a predetermined value when the two scheduled PDSCHs either partially or fully overlap in time in non-overlapping PRBs. The UE may also prioritize decoding of one of the two scheduled PDSCHs when the total number of allocated PRBs exceed the predetermined value and when the two scheduled PDSCHs either partially or fully overlap in time in non-overlapping PRBs. If a first of the two scheduled PDSCHs is a unicast PDSCH and a second of the two scheduled PDSCHs is a broadcast PDSCH, the UE may prioritize decoding of the unicast PDSCH.