Truncated UE Identifiers for Paging Energy Reduction
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Solution Overview
Problem
Current paging mechanisms in wireless communication systems, particularly in high frequency bands, result in significant energy consumption and increased processing overhead due to the need for UEs to monitor and decode paging messages, even when they are not targeted, leading to inefficiencies in RRC_IDLE and RRC_INACTIVE states.
Innovation Solution
Incorporating shortened UE identifiers in the downlink control information (DCI) on the physical downlink control channel (PDCCH), allowing UEs to determine if they are not targeted by a page and immediately enter discontinuous reception (DRX) sleep mode without decoding the RRC paging message on the PDSCH, thereby reducing unnecessary processing and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs monitor and decode paging messages in high frequency bands using beam sweeping, then paging coverage is achieved, but energy consumption and processing overhead increase significantly
Solution Approach 1:
The paging identifier is segmented into two parts: a shortened identifier (first identifier) included in the DCI on PDCCH, and a full identifier (second identifier) included in the RRC paging message on PDSCH. This segmentation allows UEs to first check the shortened identifier to quickly determine if they are being paged, avoiding full message decoding when not targeted.
Solution Approach 2:
The essential paging identification function is extracted from the full RRC paging message and placed in the DCI on PDCCH as a shortened identifier. This extraction enables UEs to perform paging detection without decoding the entire paging message, significantly reducing processing overhead and energy consumption for non-paged UEs.
2Measurement precision
If UEs decode the RRC paging message on PDSCH to determine if they are targeted, then accurate paging detection is achieved, but processing overhead and energy consumption increase
Solution Approach 1:
The paging identification is divided into a shortened version in DCI for quick screening and a full version in the RRC message for final confirmation. This two-stage identification approach maintains detection accuracy while reducing processing complexity for the majority of non-paged UEs.
Solution Approach 2:
The shortened identifier is provided in advance in the DCI on PDCCH, allowing UEs to perform preliminary checking before decoding the full RRC paging message. This preliminary action enables most UEs to determine they are not targeted without completing the full decoding process.
3Speed
If UEs remain in active state to monitor paging occasions, then paging responsiveness is improved, but energy consumption increases
Solution Approach 1:
The shortened identifier is prepared in advance in the DCI, enabling UEs in DRX sleep mode to quickly determine paging relevance upon waking. This preliminary identification allows UEs to maintain DRX operation and only stay active for full decoding when the shortened identifier indicates they are being paged.
Solution Approach 2:
The two-stage identifier system enables UEs to perform a quick check first, then only proceed to full message processing when necessary. This segmentation supports energy-efficient DRX operation while maintaining fast paging response capability when needed.
Data Source
AI summary
According to some embodiments, a method performed by a wireless device comprises receiving first paging information in a downlink control information (DCI) of a physical downlink control channel (PDCCH). The wireless device is uniquely identified by a full identifier of length L bits and the first paging information in the DCI comprises one or more short identifiers of length K bits, where K is less than L. The method further comprises determining whether one of the one or more short identifiers matches a portion of the full identifier of the wireless device. Upon determining one of the one or more short identifiers matches a portion of the full identifier of the wireless device, the method further comprises decoding second paging information in a physical downlink shared channel (PDSCH) associated with the DCI and determining the second paging information includes paging information targeted for the wireless device.