NES Cell RRC Transition via Single Random Access Signaling
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Solution Overview
Problem
In wireless communication systems with network energy savings (NES) cells, establishing RRC connections and handling paging messages can lead to increased power consumption and connection delays due to delayed system information transmission and lack of appropriate signaling mechanisms for RAN transitions or paging after SIB1 acquisition.
Innovation Solution
Implementing signaling and configuration-based mechanisms for UEs and NES cells to efficiently communicate system information and establish RRC state transitions via a single random access procedure, using a time span for msg2, msg4, or msgB communication after SIB1 transmission, and providing additional information for NES cells to determine paging operations based on communication metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the network entity transmits system information periodically or on-demand, then the UE can acquire necessary communication parameters, but the connection establishment time is delayed and power consumption increases
Solution Approach 1:
The network entity transmits SIB1 in advance before the UE needs to establish a connection. By having system information pre-available, the UE can immediately proceed with random access and connection setup without waiting for periodic broadcasts or triggering on-demand transmissions, thus reducing connection establishment time while maintaining information availability.
2Reliability
If the UE frequently monitors paging messages and system information, then it can maintain network connectivity, but power consumption increases
Solution Approach 1:
The UE monitors paging messages and system information at predetermined periodic intervals rather than continuously. The network configures specific monitoring occasions and DRX cycles, allowing the UE to enter low-power states between monitoring events while still maintaining network connectivity and receiving important updates.
Solution Approach 2:
The network entity uses paging messages to provide feedback to the UE about available system information and connection opportunities. This feedback mechanism allows the UE to remain in idle/inactive states longer by only activating when notified by the network, reducing unnecessary monitoring and power consumption while maintaining connectivity reliability.
3Loss of information
If the network entity transmits multiple types of system information (MSI and OSI), then the UE can access comprehensive network parameters, but signaling overhead and processing complexity increase
Solution Approach 1:
System information is divided into two segments: SIB1 (minimum system information) containing essential parameters for initial access and basic operation, and other SIBs (optional system information) containing additional network parameters. The UE first acquires SIB1 to establish basic connectivity, then selectively acquires other SIBs only when needed for specific functions, reducing overall processing complexity while maintaining comprehensive parameter availability.
Solution Approach 2:
The critical system information parameters are extracted and placed in SIB1 for mandatory transmission and immediate access. Less critical or optional parameters are separated into other SIBs that can be transmitted on-demand or periodically based on network configuration, allowing the UE to process only essential information during connection establishment while having access to comprehensive parameters when required.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. Various aspects generally relate to radio resource control (RRC) state transitions based on system information acquisition from a network energy savings (NES) cell. Some aspects more specifically relate to mechanisms according to which a user equipment (UE) and an NES cell may communicate system information and establish an RRC connection via a single random access procedure. In such aspects, the UE and the NES cell may use a time span for communication of a random access response that is based on the NES cell transmitting system information prior to transmitting the random access response. Some further aspects more specifically relate to mechanisms according to which the UE may provide an NES cell with information to use for determining whether to perform paging. In such aspects, the information may include one or more communication metrics.