RAN Node Identifier Segmentation for Efficient RRC Resume
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Solution Overview
Problem
Existing solutions fail to uniquely identify the source NG-RAN node from the Inactive Radio Network Temporary Identifier (I-RNTI) during the RRC Resume procedure in 5G networks, leading to difficulties in establishing a connection with the node hosting the UE's AS context.
Innovation Solution
A method involving network nodes that map a Public Land Mobile Network (PLMN) RAN Node ID to a Local RAN Node Identifier, using an Inactive Relation Table (IRT), to assist in identifying the source node by including a UE Context ID and Local RAN Node Identifier in the resume request, enabling efficient resumption of UEs from inactive to connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the I-RNTI is used to identify the source NG-RAN node during RRC Resume procedure, then the UE can be resumed from inactive state, but the source node cannot be uniquely identified leading to connection establishment difficulties
Solution Approach 1:
The I-RNTI is segmented into multiple components: a first part identifying the source NG-RAN node and a second part identifying the UE context. This segmentation allows the target node to uniquely identify the source node while maintaining the resume procedure's efficiency, resolving the contradiction between identification accuracy and procedure complexity.
2Speed
If the RRC Resume procedure is simplified for fast UE resumption, then the resumption speed improves, but the ability to uniquely identify the source node deteriorates
Solution Approach 1:
By segmenting the I-RNTI into distinct parts for source node identification and UE context identification, the system enables fast resume procedures while preserving precise source node identification. The segmented structure allows the target node to efficiently extract the source node identifier without complex processing.
Solution Approach 2:
The source NG-RAN node performs preliminary action by embedding its identifier within the I-RNTI before releasing the UE to inactive state. This preliminary inclusion of identification information ensures that when the resume procedure is quickly executed, the target node already has the necessary information to uniquely identify the source node without additional signaling overhead.
Data Source
AI summary
A method performed by a first network node for assisting a second network node in resuming of a User Equipment, UE, in inactive state into connected state in a Radio Access Network, RAN. The first network node obtains (401) a Local RAN Node Identifier associated with a Public Land Mobile Network, PLMN, RAN Node ID, identifying the first network node. The first network node sends (402) the Local RAN node Identifier and associated PLMN RAN Node ID to be obtainable by the second network node. The first network node suspends (403) the UE from connected state into inactive state and sends an identifier to the UE. The identifier comprises a UE Context ID and the associated Local RAN Node Identifier. The UE Context ID identifies the UE context associated with the UE. The UE Context ID, Local RAN Node Identifier and associated PLMN RAN Node ID will assist the second network node to obtain the UE Context for the resuming of the UE into connected state, wherein a connection is to be provided by the second network node.