Reduced-Capability UE Uplink Timing via RRC-Configured PUSCH Parameters
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Solution Overview
Problem
Existing wireless communication systems face limitations in communication flexibility and efficiency, particularly in managing uplink processing times for reduced capability user equipment (UEs) in 5G networks, which affect the performance of devices with compact form factors and lower complexity requirements.
Innovation Solution
Implementing a user equipment (UE) and base station apparatus that utilize RRC messages to indicate reduced UE processing capabilities, numerology, scaling factors, and offsets for Physical Uplink Shared Channel (PUSCH) preparation times, ensuring that uplink symbol transmissions for Demodulation Reference Signals (DM-RS) occur no earlier than a defined symbol or slot after the reception of the Physical Downlink Control Channel (PDCCH), thereby optimizing processing timelines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reduced UE processing capability is implemented for compact devices, then device complexity is reduced, but uplink processing time increases
Solution Approach 1:
The patent introduces multiple parameters including reduced UE processing capability indicators, numerology configurations, scaling factors, and offsets that can be dynamically adjusted through RRC messaging. These parameters enable flexible modification of processing timelines without requiring hardware changes, allowing compact devices to operate with reduced complexity while maintaining acceptable processing times through network-configured adjustments.
Solution Approach 2:
The system dynamically adapts processing timelines based on device capabilities and network conditions. The base station can configure different processing capability levels, numerology settings, and timing offsets depending on the specific UE type (e.g., industrial sensors, wearables), enabling the system to optimize performance for each device category rather than using fixed processing requirements.
2Reliability
If processing timelines are extended for reduced capability UEs, then communication reliability is improved, but communication efficiency decreases
Solution Approach 1:
The patent applies different processing capability configurations to different UE types and service requirements. Instead of a one-size-fits-all approach, the system can assign specific processing capability levels, numerology settings, and timing offsets to particular devices or services, ensuring that each gets the appropriate processing time for its reliability requirements without unnecessarily impacting overall system efficiency.
Solution Approach 2:
Through configurable parameters including processing capability indicators, scaling factors, and offsets, the system can adjust processing timelines to match specific service requirements. This enables reliable communication for critical applications while maintaining faster processing for less time-sensitive traffic, balancing reliability and efficiency through parameter optimization.
3Adaptability or versatility
If multiple RRC messages with configuration parameters are transmitted, then communication flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent uses universal RRC messaging structures that can convey multiple configuration parameters (processing capability, numerology, scaling factors, offsets) in a standardized format. This multi-functional approach allows the same signaling mechanism to handle various configuration needs across different UE types and service scenarios, providing flexibility without requiring separate specialized signaling protocols for each parameter type.
Data Source
AI summary
A user equipment (UE) is described. The UE receives an RRC message comprising first information used for indicating a reduced UE processing capability from a set of multiple reduced UE processing capabilities. The UE receives an RRC message comprising second information used for indicating a numerology for a Physical Uplink Shared Channel (PUSCH) transmission. The UE receives an RRC message comprising third information used for indicating a scaling factor for reduced UE PUSCH preparation time. The UE receives an RRC message comprising fourth information used for indicating an offset for reduced UE PUSCH preparation time. The UE transmits, to the base station apparatus, a transport block if the first uplink symbol in the PUSCH allocation for a transport block including a Demodulation Reference Signal (DM-RS) is no earlier than at symbol X.