UE Paging Early Indication for Low-Power TRS Monitoring
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Solution Overview
Problem
Existing wireless communication systems face challenges in power saving techniques for UEs, particularly in 5G NR systems, due to high signaling overhead and blind detection complexity for TRS/CSI-RS decoding, leading to unnecessary UE wake-ups and increased power consumption.
Innovation Solution
Implementing a shared Layer 1 (L1) signaling for paging early indication (PEI) that provides information on UE groups/sub-groups and TRS/CSI-RS availability before the next paging occasion, using methods such as sequence-based, P-DCI-based, and P-PDSCH-based PEI to reduce network signaling overhead and blind detection complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If L1 physical layer signaling is used for both TRS/CSI-RS availability indication and UE group/sub-group information for paging, then both functions can be provided, but signaling overhead increases significantly
Solution Approach 1:
The patent combines TRS/CSI-RS availability indication and UE group/sub-group paging information into a single L1 physical layer signaling mechanism. The PEI message structure integrates both functions, where the base station transmits a unified signaling message that simultaneously indicates TRS/CSI-RS availability and identifies which UE groups should wake up for paging, thereby reducing the total number of separate signals required
Solution Approach 2:
The PEI signaling mechanism is designed to perform multiple functions: it serves as both a TRS/CSI-RS availability indicator and a UE group paging identifier. This multi-functional approach allows the same signaling resource to convey different types of information, reducing overall signaling overhead while maintaining adaptability for both purposes
2Reliability
If UE wakes up to monitor PDCCH for paging messages, then paging can be received, but power consumption increases due to complex decoding
Solution Approach 1:
The base station transmits PEI signaling before the actual paging occasion to pre-indicate which UE groups need to wake up and monitor PDCCH. This preliminary indication allows UEs to make informed decisions about whether to activate their receivers and perform complex paging decoding, thereby avoiding unnecessary power consumption for UEs that do not have pending paging messages
Solution Approach 2:
Instead of requiring all UEs to fully decode paging messages at every paging occasion, the system implements partial action by first transmitting PEI information. Only UEs whose group is indicated in the PEI will proceed to full paging message decoding, while other UEs can remain in a lower power state, thus reducing overall power consumption while ensuring reliable paging delivery to the intended recipients
3Measurement precision
If TRS/CSI-RS decoding is performed, then channel state information can be obtained, but detection complexity and blind detection increase
Solution Approach 1:
The PEI signaling is transmitted in advance to indicate TRS/CSI-RS availability before the actual reference signals are sent. This preliminary indication allows UEs to prepare their reception and processing in advance, reducing the need for complex blind detection and enabling more efficient, targeted decoding of TRS/CSI-RS only when actually available and needed
Data Source
AI summary
A wireless communication method performed by a user equipment (UE) in a radio resource control (RRC) idle/inactive state includes being configured, by a base station, with a layer 1 (L1) signaling for paging early indication (PEI) before a paging occasion (PO), wherein the L1 signaling includes a bits' field consisting of two sets, wherein the first set of bits' field indicates information of UE sub-groups for PO and the second set of bits' field indicates an availability indication of a tracking reference signal (TRS).