TRS Parameter Paging for Idle UE Tracking Precision
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Solution Overview
Problem
Idle or inactive user equipment (UEs) in wireless communications systems do not receive notifications of dynamic changes in tracking reference signal (TRS) power levels, impacting their ability to perform effective time and frequency tracking.
Innovation Solution
Network entities dynamically indicate TRS parameters to UEs in idle or inactive modes using dynamic paging indicators or downlink control information, extending existing indicators with bitmaps or lists to convey changing TRS parameters and resource sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If idle or inactive UEs do not receive dynamic TRS parameter notifications, then power consumption is reduced and device complexity is minimized, but time and frequency tracking precision deteriorates
Solution Approach 1:
The network entity pre-configures TRS parameters and transmission configurations for idle or inactive UEs before the UEs need to perform tracking. When TRS parameters change, the network entity proactively notifies the UEs through paging messages or downlink control information, allowing UEs to prepare for parameter changes in advance without continuous monitoring, thus maintaining tracking precision while reducing power consumption.
Solution Approach 2:
The system implements a feedback mechanism where the network entity monitors TRS parameter changes and actively notifies idle or inactive UEs when changes occur. This feedback loop ensures that UEs receive timely updates about TRS parameter changes through paging indicators or DCI messages, maintaining accurate time and frequency tracking without requiring continuous active connection to the network.
2Adaptability or versatility
If the network entity extends existing paging indicators with bitmaps or lists to convey dynamic TRS parameters, then TRS parameter update capability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent reuses existing paging indicator structures and downlink control information formats to convey TRS parameter updates. By extending these existing universal signaling mechanisms with additional fields for TRS parameters, the system achieves multi-functionality where the same signaling infrastructure serves both traditional paging purposes and dynamic TRS parameter notification, avoiding the need for separate dedicated signaling channels.
Solution Approach 2:
The system dynamically changes TRS parameters by embedding them in paging messages or DCI formats using bitmaps or lists. These parameter changes are conveyed through efficient encoding schemes where bitmaps indicate which parameters have changed and lists provide the actual updated values, allowing flexible parameter updates without redesigning the entire signaling structure.
3Measurement precision
If idle or inactive UEs continuously monitor for TRS parameter changes, then tracking accuracy is maintained, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system employs periodic action where idle or inactive UEs wake up at predetermined intervals to check for TRS parameter updates through paging messages or DCI. This periodic monitoring approach maintains tracking accuracy by ensuring UEs receive updates at regular intervals while significantly reducing power consumption compared to continuous monitoring, as UEs can enter low-power states between monitoring occasions.
Data Source
AI summary
Methods, systems, and devices for dynamic indication of tracking references signal (TRS) and wireless communications are described. A user equipment (UE) that is operating in a first operating mode may receive one or more TRS parameters from a network entity for the UE to perform channel measurements associated with one or more TRSs. The UE may receive a dynamic paging indicator message that indicates a set of updated TRS parameters. The dynamic paging indicator may include at least one TRS parameter that is different from the one or more TRS parameters. The UE may then receive one or more TRSs, and may perform channel measurement in accordance with the set of updated TRS parameters.