Cell Selection in Energy Saving Mode via Triggered SSB
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Solution Overview
Problem
In wireless communication systems, energy saving mode cells pose challenges during cell selection and reselection due to reduced transmission of synchronization signal blocks (SSBs), leading to inefficient cell access procedures and potential degradation in communication efficiency and reliability.
Innovation Solution
The implementation of methods and systems that allow user equipment (UE) to receive discovery signals with less information than SSBs from network entities operating in energy saving mode, enabling the transmission of trigger signals to initiate SSB transmissions for cell access procedures, based on specific conditions such as signal strength and priority thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network entities transmit full SSB for cell access procedures, then cell access reliability is improved, but network power consumption increases
Solution Approach 1:
The patent segments the cell access procedure into two phases: initial cell identification using reduced discovery signals (KAS) and subsequent cell access using full SSB. This segmentation allows the network to transmit minimal information during energy-saving mode while still enabling complete cell access when needed, resolving the contradiction between power consumption and access reliability
Solution Approach 2:
The patent implements periodic transmission of full SSB at predefined time instances even when network entities are in energy-saving mode. This periodic action ensures that cell access reliability is maintained at specific intervals while allowing the network to operate in low-power mode between these instances, balancing reliability requirements with power consumption
2Use of energy by stationary object
If network entities operate in energy saving mode with reduced transmissions, then network power consumption is reduced, but cell access efficiency deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism where the UE triggers full SSB transmission by detecting reduced discovery signals (KAS) from the network. This intermediary trigger system allows the network to operate in energy-saving mode with minimal transmissions while still enabling efficient cell access when the UE initiates the process, thus improving cell access efficiency without sacrificing power savings
3Use of energy by stationary object
If network entities transmit reduced discovery signals instead of full SSB, then network power consumption is reduced, but information completeness deteriorates
Solution Approach 1:
The patent applies preliminary action by having the network transmit reduced discovery signals (KAS) in advance during energy-saving mode. These preliminary signals contain sufficient information for the UE to identify potential cells and trigger full SSB transmission, enabling the network to prepare for cell access procedures while consuming minimal power before the actual access occurs
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide for cell access procedures based on multiple types of discovery signals that may be transmitted by network entities operating in an energy saving (ES) mode. A user equipment (UE) may establish wireless connectivity via a first network entity and receive a discovery signal from a second network entity that contains less information than a synchronization signal block (SSB) for use in a cell access procedure. The UE may transmit, based at least in part on one or more conditions associated with the discovery signal being satisfied, a trigger signal to the ES-mode second network entity to transmit a SSB for use in the cell access procedure. The UE may monitor for the SSB based at least in part on the trigger signal, and perform the cell access procedure based at least in part on the SSB.