gNB-CU UE Context Signaling to Prevent Duplicate DU Allocation
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Solution Overview
Problem
In 3GPP LTE systems, when a terminal transitions from RRC_INACTIVE to RRC_CONNECTED state to transmit non-SDT bearer data, the gNB-DU allocates additional resources and UE context even if they are already allocated for SDT, leading to resource waste due to duplicate allocation.
Innovation Solution
Implement a method for the gNB-CU to transmit and receive request and response messages with the gNB-DU regarding UE context, enabling efficient management of resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gNB-DU allocates resources and UE context for a terminal during SDT without additional information, then the allocation process is simple and fast, but duplicate resource and UE context allocation occurs leading to resource waste
Solution Approach 1:
The patent implements a feedback mechanism where the gNB-CU informs the gNB-DU about the terminal's state transition to RRC_CONNECTED during SDT through a request message. This feedback loop ensures the gNB-DU has accurate information before allocating resources, preventing duplicate allocation while maintaining efficient resource management.
Solution Approach 2:
The gNB-CU acts as an intermediary between the terminal and gNB-DU, managing the coordination of resource allocation. By introducing the gNB-CU as a mediator that handles the request message transmission, the system avoids direct duplicate allocation issues between the terminal and gNB-DU while maintaining allocation speed.
2Ease of operation
If the gNB-DU does not know about the terminal's state transition during SDT, then the system operation is simple, but additional resource allocation occurs causing resource waste
Solution Approach 1:
A feedback message mechanism is established where the gNB-CU provides information about the terminal's state transition to the gNB-DU. This feedback ensures the gNB-DU operates with accurate knowledge of terminal states without complicating the overall system operation, preventing unnecessary resource allocation.
Solution Approach 2:
The system divides the base station functionality into gNB-CU and gNB-DU segments, with the gNB-CU handling the information management and message transmission tasks. This segmentation allows the gNB-DU to remain simple in operation while the gNB-CU manages the complexity of coordinating resource allocation information.
3Adaptability or versatility
If the terminal interrupts SDT to transition to RRC_CONNECTED for non-SDT bearer data, then non-SDT data transmission is enabled, but additional resource and UE context allocation occurs causing resource waste
Solution Approach 1:
The feedback mechanism ensures that when a terminal interrupts SDT to transition to RRC_CONNECTED, the gNB-CU informs the gNB-DU about this state change. This feedback prevents the gNB-DU from performing duplicate resource allocation, allowing the terminal to transmit non-SDT bearer data flexibly without resource waste.
Solution Approach 2:
The system performs preliminary action by having the gNB-CU send the request message to the gNB-DU before the terminal actually needs additional resources. This preliminary information sharing ensures the gNB-DU is already aware of the state transition and will not allocate duplicate resources when the terminal needs to transmit non-SDT data.
Data Source
AI summary
One disclosure of the present specification provides a method for establishing connection by gNB-CU. The method may comprise the steps of: transmitting a request message relating to UE context to the gNB-DU; and receiving a response message from the gNB-DU.