PUSCH Scheme Switching Between Multi-TRP and Single-TRP
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Solution Overview
Problem
Existing wireless communication systems lack the ability to dynamically switch between multi-transmission reception point (multi-TRP) and single-transmission reception point (single-TRP) PUSCH schemes, particularly for critical services like ultra-reliable low-latency communications (URLLC), and there is no solution for determining the appropriate scheme or interpreting DCI fields differently based on the applied scheme.
Innovation Solution
The user equipment (UE) determines the appropriate PUSCH scheme (multi-TRP or single-TRP) based on indicators in downlink control information (DCI) or medium access control (MAC) elements, using methods such as TDRA entries, SRI fields, dedicated fields in DCI, MAC CE, or RNTIs, to enable dynamic switching and correct interpretation of DCI fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed single-TRP or multi-TRP scheme is used, then the system is simple to implement, but the reliability and adaptability for different service requirements cannot be improved
Solution Approach 1:
The patent implements dynamic switching between single-TRP and multi-TRP schemes based on service requirements. The network can dynamically select and indicate the appropriate scheme through DCI or MAC CE, allowing the system to adapt to different reliability needs without being fixed, thus resolving the contradiction between reliability improvement and system complexity
Solution Approach 2:
The patent changes the transmission scheme parameter (single-TRP or multi-TRP) based on service type and channel conditions. By allowing parameter changes rather than fixing them, the system can improve reliability for critical services like URLLC while maintaining simplicity for regular services, resolving the technical contradiction
2Measurement precision
If DCI fields are interpreted the same way regardless of scheme, then the interpretation is simple, but the precision and correctness for different schemes cannot be improved
Solution Approach 1:
The patent applies different interpretation rules to DCI fields based on the active transmission scheme. When single-TRP scheme is active, certain fields are interpreted one way; when multi-TRP scheme is active, the same fields are interpreted differently. This local differentiation improves interpretation precision while keeping the logic manageable through clear conditional rules
Solution Approach 2:
The patent uses the scheme indication (from DCI or MAC CE) as an intermediary that determines how subsequent DCI fields should be interpreted. This intermediary mechanism allows precise interpretation for each scheme type without requiring complex direct mapping, resolving the contradiction between precision and complexity
3Reliability
If multi-TRP scheme is always used, then the beam diversity and reliability are improved, but the overhead and complexity increase
Solution Approach 1:
The patent applies multi-TRP scheme partially - only when and where it is needed for specific services or channel conditions. For services that don't require high reliability, the simpler single-TRP scheme is used. This partial application reduces control information overhead while still providing beam diversity reliability where necessary, resolving the technical contradiction
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for enabling dynamic switching between multi-transmission reception point (multi-TRP) and single-transmission reception point (single-TRP). A method may include receiving a first indication in a downlink control information or a medium access control control element. The method may further include determining, at a user equipment, whether to apply a multi-transmission reception point physical uplink shared channel scheme or a single-transmission reception point physical uplink shared channel scheme for transmitting a transport block based on the first indication. In addition, the method may include interpreting at least one downlink control information field differently depending on whether it is determined that the single-transmission reception point physical uplink shared channel scheme or the multi-transmission reception point physical uplink shared channel scheme is applicable.