Downlink Small Data Reception Without Connected-Mode Transitions
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Solution Overview
Problem
Small and infrequent data transmissions in wireless communications lead to increased power consumption and signaling overhead, particularly affecting battery-limited devices like eMBB mobile devices and IoT devices due to frequent transitions between inactive and connected modes.
Innovation Solution
Methods and apparatus for downlink small data transmission and reception are developed to minimize power consumption by optimizing wireless transmit/receive units (WTRUs) to reduce unnecessary transitions and enhance efficiency in handling small data packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a WTRU transitions from inactive mode to connected mode to receive small downlink data, then the data can be received reliably, but power consumption increases and battery life decreases
Solution Approach 1:
The network pre-configures the WTRU with downlink small data transmission resources and parameters while the WTRU is in inactive mode. The WTRU monitors these pre-configured resources for downlink data without transitioning to connected mode, enabling data reception in advance of the actual data arrival and avoiding mode transition overhead.
Solution Approach 2:
The patent extracts the essential data reception function from the full connected mode operation. By separating small downlink data reception from the complete connected mode state transition, the WTRU can handle small data packets using a simplified monitoring mechanism that consumes less power while maintaining reliability.
2Reliability
If a WTRU transitions to connected mode for small data transmission, then data can be transmitted reliably, but signaling overhead in the network increases
Solution Approach 1:
The network performs preliminary configuration of downlink small data resources, including physical resource blocks, modulation schemes, and coding parameters, before the WTRU needs to receive data. This pre-configuration eliminates the need for extensive signaling during actual data transmission, reducing network overhead while ensuring reliable delivery.
Solution Approach 2:
The patent applies partial action by implementing a simplified monitoring mechanism that only activates for small downlink data transmissions. Instead of full connected mode signaling, the WTRU monitors specific pre-configured resources with reduced signaling requirements, sufficient for small data packets but not excessive for larger transmissions.
3Use of energy by moving object
If a WTRU monitors for downlink small data in inactive mode, then power consumption is reduced, but the complexity of managing monitoring resources increases
Solution Approach 1:
The pre-configured downlink small data monitoring resources serve multiple functions: they enable data reception, provide timing synchronization, and maintain uplink timing alignment. This multi-functionality reduces the need for separate mechanisms for each function, simplifying overall resource management while keeping power consumption low.
Solution Approach 2:
The network configures specific monitoring parameters such as monitoring periodicity, resource offsets, and transmission time intervals that adapt to different traffic patterns. By changing these parameters dynamically through RRC release messaging, the system manages complexity centrally in the network rather than at the WTRU, reducing device-side complexity while maintaining low power operation.
Data Source
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AI summary
Methods and apparatus for downlink small data reception in wireless communications are provided. In an example, a method includes receiving configuration information for small data transmission (SDT), and the configuration information indicates one or more uplink (UL) configured grants (CGs), one or more downlink (DL) CGs, and a Transport Block Size (TBS) threshold for SDT; receiving a DL data transmission using a DL CG of the one or more DL CGs; determining a TBS, a HARQ feedback, and a Data Radio Bearer (DRB) associated with the received DL data transmission; and transmitting, using an UL CG of the one or more UL CGs, the HARQ feedback associated with the received DL data transmission, based on a determination that the TBS associated with the received DL data transmission is less than the TBS threshold and/or the DRB associated with the received DL data transmission supports SDT.