Network-Controlled Repeater RRC State Transitions via CU-DU Coordination
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Solution Overview
Problem
Existing wireless communications systems face challenges in efficiently managing the radio resource control (RRC) state transitions of network-controlled repeaters, particularly in disaggregated architectures where the central unit (CU) and distributed unit (DU) coordination is lacking, leading to inefficiencies in releasing and resuming RRC connections.
Innovation Solution
The proposed solution involves the DU and CU coordinating the release and resumption of RRC connections for network-controlled repeaters (NCRs) by exchanging control signals with identifiers, allowing the DU to retain NCR-MT identifiers and initiate paging, thereby enabling seamless transitions between RRC states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the CU and DU coordinate RRC connection release and resumption for NCR-MT, then the efficiency of RRC state management is improved, but the device complexity increases due to additional coordination signaling between CU and DU
Solution Approach 1:
The patent segments the RRC state management functions by separating the NCR-MT identifier retention function at the DU from the RRC connection control function at the CU. The DU retains the NCR-MT identifier locally to enable rapid detection of paging triggers and initiate local paging procedures, while the CU maintains overall RRC connection control. This segmentation reduces coordination overhead by allowing the DU to act autonomously on identifier-based paging events without requiring full CU-DU signaling round trips for each paging operation.
2Loss of time
If the DU retains the NCR-MT identifier, then the latency for detecting paging triggers and resuming RRC connection is reduced, but the loss of information increases due to the DU needing to store and manage identifier state
Solution Approach 1:
The DU performs preliminary action by retaining the NCR-MT identifier in advance before any paging event occurs. This pre-retention of the identifier enables the DU to immediately detect paging triggers and initiate RRC connection resumption procedures without waiting for CU-DU signaling exchanges. The identifier is stored locally at the DU as a preparatory measure, allowing rapid response to paging events while minimizing the time the NCR-MT spends in inactive state.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein support transitioning the radio resource control (RRC) state of a network controlled repeater (NCR). A distributed unit (DU) and a central unit (CU) may coordinate the release and resumption of the RRC connection of the NCR. The CU may transmit a control signal to the DU indicating to release the RRC connection of the NCR. The control signal may include a flag, such as an identifier of the NCR, and the DU may retain the identifier of the NCR. The DU may transmit a message indicating a release of the RRC connection to the NCR. The DU may coordinate the resumption of the RRC connection of the NCR by transmitting a second message to the CU. The second message may include a request to initiate a paging of the NCR and may include the identifier of the NCR.