UE Idle/Inactive Modes: Sidelink Reference Signal Sharing
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Solution Overview
Problem
User Equipment (UE) operating in idle or inactive modes experiences increased power consumption and reduced efficiency due to frequent wake-ups to receive reference signals with low periodicity and limited bandwidth, which are not optimally configured for these modes.
Innovation Solution
UEs in idle/inactive modes receive reference signal configurations via sidelink transmissions from connected mode UEs, utilizing active downlink beams and adjacent beams to reduce wake-up times and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If reference signals are transmitted with low periodicity and limited bandwidth to save network resources, then network resource consumption is reduced, but UE power consumption increases due to frequent wake-ups
Solution Approach 1:
The network pre-configures the UE with multiple reference signal occasions and multiple wake-up configurations before the UE enters idle mode. This preliminary configuration allows the UE to select appropriate reference signal occasions based on its specific needs, reducing the number of frequent wake-ups required while maintaining network resource efficiency.
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the UE to selectively configure reference signal monitoring based on service requirements, mobility states, and channel conditions. The UE can dynamically adjust its wake-up behavior and reference signal reception strategy, transforming the static low-periodicity transmission into a flexible system that balances network resource usage and UE power consumption.
2Quantity of substance
If reference signals are transmitted with low periodicity to reduce transmission overhead, then transmission overhead is reduced, but the duration needed to obtain channel parameters increases
Solution Approach 1:
The network pre-configures multiple reference signal occasions with different periodicities and characteristics before the UE enters idle mode. This preliminary setup enables the UE to access multiple reference signal opportunities without requiring frequent wake-ups, thus reducing both transmission overhead and the time needed to acquire channel parameters.
Solution Approach 2:
The patent changes the parameters of reference signal transmission by introducing multiple configurations with varying periodicities, bandwidths, and resource allocations. The UE can select the most appropriate configuration based on its current state, optimizing the balance between transmission overhead and parameter acquisition time.
3Reliability
If UEs wake up repeatedly to receive reference signals during reference signal occasions, then synchronization and channel tracking are maintained, but power consumption increases and efficiency decreases
Solution Approach 1:
The network provides preliminary configuration of multiple reference signal occasions and wake-up parameters before the UE enters idle mode. This advance configuration enables the UE to maintain synchronization and channel tracking reliability while minimizing the frequency and duration of wake-ups, thereby improving overall UE efficiency.
Solution Approach 2:
The patent introduces dynamic selection mechanisms that allow the UE to adaptively choose from multiple pre-configured reference signal occasions based on current channel conditions, mobility state, and service requirements. This dynamic approach maintains reliable synchronization and tracking while optimizing power consumption and efficiency.
4Quantity of substance
If reference signals are transmitted with limited bandwidth to conserve resources, then resource consumption is reduced, but the quality of channel estimation deteriorates
Solution Approach 1:
The network pre-configures multiple reference signal occasions with different bandwidth allocations before the UE enters idle mode. This preliminary configuration allows the UE to access reference signals with appropriate bandwidth for channel estimation quality while conserving network resources through selective reception based on current needs.
Solution Approach 2:
The patent changes the bandwidth parameter of reference signal transmission by providing multiple configurations with varying bandwidth allocations. The UE can select the most appropriate bandwidth configuration based on channel conditions and service requirements, optimizing the balance between resource consumption and channel estimation quality.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A connected mode UE may share reference signal configurations with an idle/inactive mode UE via a sidelink transmission. The connected mode UE may transmit a sidelink transmission including one or more reference signal configurations over a sidelink channel to an idle/inactive mode UE. The reference signal configuration may include reference signal resources that correspond to one or more beams that are tracked by the connected mode UE, such as an active downlink beam or beams adjacent to an active downlink beam. The idle/inactive mode UE may use the reference signal configuration to monitor for and receive one or more reference signals from the base station. In some examples, the connected mode UE may determine to transmit the sidelink transmission based on satisfaction of a trigger condition, such as a proximity of the idle/inactive mode UE to the connected mode UE.