MT-SDT UE DRX After Downlink Data Reception
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Solution Overview
Problem
In NR networks, UEs in RRC inactive state experience significant signaling overhead and power consumption due to frequent transitions to connected state for small data transmissions, especially for infrequent data packets, which is exacerbated by the introduction of MT-SDT procedures where UEs need to monitor PDCCH for DL assignments and UL grants after receiving RRCRelease.
Innovation Solution
Implementing Discontinuous Reception (DRX) at the UE during MT-SDT procedures, configuring DRX schemes based on energy and traffic conditions, and adjusting DRX preferences to reduce unnecessary energy consumption by allowing the UE to enter idle mode after sending HARQ-ACK or applying DRX configurations via RRCRelease messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE monitors PDCCH continuously during MT-SDT procedure, then data transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by implementing DRX (Discontinuous Reception) mechanisms where the UE periodically wakes up to check for PDCCH assignments rather than continuously monitoring. The UE transitions between active and inactive states based on DRX cycles, allowing it to monitor PDCCH only at specific intervals during MT-SDT procedures. This reduces energy consumption while maintaining acceptable data transmission reliability through configured wake-up periods and inactivity timers.
2Productivity
If UE transitions to connected state frequently for small data packets, then data transmission capability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring DRX parameters and RRC release configurations before the actual data transmission occurs. The UE receives DRX configuration in RRC release messages prior to entering inactive state, allowing it to automatically manage its reception cycles without requiring frequent connected state transitions. This preliminary configuration enables the UE to handle small data packets efficiently while reducing signaling overhead.
3Use of energy by moving object
If UE applies DRX during MT-SDT procedure, then energy consumption is reduced, but PDCCH monitoring capability is limited
Solution Approach 1:
The patent applies dynamics by implementing adaptive DRX mechanisms where the UE can dynamically adjust its DRX parameters based on traffic conditions and network indications. The UE monitors network indicators to determine when to wake up from DRX cycles, allowing flexible adaptation between energy saving mode and active monitoring mode. This dynamic adjustment enables the UE to optimize the balance between energy consumption and PDCCH monitoring capability based on actual transmission needs.
Data Source
AI summary
Systems and methods for implementing Discontinuous Reception (DRX) are provided. In some embodiments, a method performed by a User Equipment (UE) for implementing DRX includes: configuring a DRX scheme which is activated in certain conditions; implementing DRX at the UE during one or more of the group consisting of: from the time the UE receives an RRCRelease message; after the UE receives DL data; and until terminating a (MT-SDT) session. This can result in significant energy benefits at the UE end. Some embodiments enable DRX during the MT-SDT procedure. The advantage of the solution is reduced energy consumption by the UE by saving the energy spent by enabling DRX in the MT-SDT procedure.