Reference Signal Resource Indication for Idle Mode UEs
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Solution Overview
Problem
In wireless communication systems, particularly in idle or inactive modes, user equipment (UE) faces challenges in efficiently utilizing reference signal resources, leading to increased power consumption and delayed paging occasions due to the scarcity of synchronization signals.
Innovation Solution
A method where a base station determines and transmits a reference signal configuration, including channel state information reference signals or tracking reference signals, to user equipment in idle or inactive modes, allowing them to utilize allocated reference signal resources more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UEs in idle or inactive modes use traditional synchronization signals for channel estimation, then power consumption increases and paging delay occurs, but reference signal resources are scarce in these modes
Solution Approach 1:
The patent makes reference signals originally designed for connected mode UEs universally applicable to idle and inactive mode UEs. The base station transmits reference signals (CSI-RS or TRS) that can be used by UEs in any RRC state for channel estimation, allowing these UEs to benefit from dedicated reference signal resources without requiring separate signal configurations for idle/inactive modes.
Solution Approach 2:
The base station performs preliminary configuration by indicating reference signal resource allocations to idle and inactive mode UEs through system information or paging messages before the UEs actually need to receive paging. This advance indication allows UEs to pre-configure their channel estimation parameters and be ready for efficient paging reception, reducing both power consumption and delay.
2Reliability
If reference signal resources are allocated specifically for connected mode UEs, then connected mode performance improves, but idle and inactive mode UEs face resource scarcity
Solution Approach 1:
The patent creates a universal reference signal resource allocation mechanism where the same reference signal resources (CSI-RS or TRS) serve multiple purposes and multiple UE states. The base station transmits reference signals that can be utilized by UEs in connected, idle, and inactive modes, making the resource allocation system adaptable to different RRC states while maintaining high communication reliability.
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the reference signal configuration to be flexibly indicated to UEs based on their current RRC state. The base station can dynamically adjust the indication of reference signal resources through system information or paging messages, enabling the system to adapt reference signal usage to the specific needs of UEs in different modes while maintaining reliable communication.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station (BS) may determine, for a user equipment (UE) in an idle mode or an inactive mode, a reference signal configuration, wherein the reference signal configuration is for a channel state information reference signal or a tracking reference signal; and transmit, to the UE, a message including information identifying the reference signal configuration. Numerous other aspects are provided.