5G NR Paging Indication Using Group-Level DCI to Save UE Power
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Solution Overview
Problem
The increased power consumption of user equipment (UE) in idle or inactive states due to unnecessary decoding and parsing of physical downlink shared channels for potential paging messages in the 5G NR system.
Innovation Solution
Implementing a method where downlink control information (DCI) indicates whether groups of terminal devices are paged, allowing devices to skip decoding if not paged, and optionally indicating the presence of channel state information reference signals, reducing unnecessary receptions and parsing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device receives and decodes the PDSCH to check for paging messages, then the paging message can be received accurately, but the power consumption increases due to unnecessary decoding when no paging message is present
Solution Approach 1:
The network device performs a preliminary action by sending downlink control information (DCI) that indicates whether a paging message will be transmitted on the PDSCH. The terminal device uses this advance information to determine whether to decode the PDSCH, avoiding unnecessary power consumption when no paging message is present while ensuring reliable reception when a message is sent.
Solution Approach 2:
The downlink control information (DCI) acts as an intermediary between the network device and the terminal device. It carries indication information that mediates the terminal device's decision to decode or skip the PDSCH, thereby resolving the contradiction between reliable paging reception and power consumption by providing intermediate guidance information.
2Reliability
If the terminal device wakes up at intervals to receive paging messages, then the device can respond to paging calls, but the device cannot remain in low power consumption state continuously
Solution Approach 1:
The network device sends downlink control information in advance to indicate whether a paging message will be transmitted. This preliminary action allows the terminal device to wake up briefly to check the indication, and only fully activate the receiver and decode PDSCH when necessary, thereby extending the duration of low power consumption state while maintaining paging reception capability.
Solution Approach 2:
The terminal device wakes up at periodic intervals to check for paging indications, rather than continuously monitoring. This periodic action pattern, combined with the indication mechanism, allows the device to maintain paging reception capability while spending most time in low power consumption state, thus extending the effective duration of low power operation.
3Loss of information
If the DCI includes detailed paging information, then the paging message can be conveyed completely, but the signaling overhead increases
Solution Approach 1:
The paging information is extracted from the downlink control information (DCI) and placed into a separate paging message transmitted on the PDSCH. The DCI only contains essential indication information (whether paging is present and basic scheduling info), reducing signaling overhead, while the complete paging information is conveyed in the extracted paging message that is only transmitted when needed.
Solution Approach 2:
The paging communication is segmented into two parts: a compact DCI part that provides essential indication and scheduling information with low overhead, and a separate paging message part that contains complete paging information but is only transmitted when necessary. This segmentation reduces overall signaling overhead while maintaining information completeness.
Data Source
AI summary
Embodiments of this application disclose a paging indication method and apparatus. The method includes: A terminal device receives downlink control information DCI from a network device, where the DCI indicates whether M terminal devices in N groups are paged, M is an integer greater than or equal to 1, and N is an integer greater than or equal to 1 and less than or equal to M; and when determining that a terminal device in a group in which the terminal device is located is paged, the terminal device receives a PDSCH scheduled by the DCI from the network device, where the PDSCH is used to carry a paging message.