Recurrent Data Reception in Idle/Inactive UEs With RF Power Saving
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Solution Overview
Problem
User Equipment (UE) in idle/inactive mode faces challenges with power consumption due to the need to keep its radio frequency receiver chain fully operational for potential PDSCH reception, as the timing between PDCCH and PDSCH is uncertain, leading to unnecessary RF activity even when not paged.
Innovation Solution
The network provides assistance information, such as PDSCH time-domain resource allocation guarantees, allowing UEs to optimize their power and RF states by processing PDCCH first and adjusting their operational mode for PDSCH reception only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE keeps its RF receiver chain fully operational for potential PDSCH reception, then data reception reliability is improved, but power consumption increases
Solution Approach 1:
The network provides assistance information in advance (via SIB1 or dedicated signaling) about the timing relationship between PDCCH and PDSCH, specifically the k0 value indicating the slot offset. This allows the UE to determine beforehand when PDSCH reception is scheduled, so it can activate its RF receiver chain only at those specific times rather than keeping it continuously operational, thus reducing power consumption while maintaining reliable data reception
Solution Approach 2:
The UE dynamically adjusts its RF receiver chain operational state based on the received assistance information. When PDSCH reception is scheduled (indicated by the timing relationship information), the UE activates the RF chain; when no PDSCH is scheduled, the UE can deactivate or put the RF chain in a low-power state. This dynamic adaptation resolves the contradiction between maintaining reliability and reducing power consumption
2Reliability
If the UE activates RF receiver for PDSCH reception, then data reception capability is improved, but unnecessary RF activity occurs when not paged
Solution Approach 1:
The network provides assistance information in advance about PDSCH timing (k0 offset value) so the UE knows exactly when to activate its RF receiver. This preliminary information allows the UE to avoid unnecessary RF activation during idle/inactive modes when no data is scheduled, eliminating wasteful energy consumption while maintaining the capability to receive data when actually needed
Solution Approach 2:
The UE uses the received assistance information to autonomously determine its own RF activation schedule without continuous network control. By processing the timing relationship information independently, the UE can self-manage its RF activity to match actual data reception needs, avoiding unnecessary activation and reducing energy loss
Data Source
AI summary
According to some embodiments, a method performed by a wireless device operating in idle/inactive mode comprises receiving assistance information from a network node, wherein the assistance information comprises a time-domain resource guarantee for a recurrent wakeup activity; and based on the assistance information, determining whether to enter a power saving mode of operation between receiving control information associated with the recurrent wakeup activity and receiving data information associated with the recurrent wakeup activity.