5G Terminal Paging Type Detection for Correct State Transition
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Solution Overview
Problem
In a 5G system, terminal devices face challenges in determining the type of paging message received, which affects their subsequent behavior, as RAN and CN paging require different responses.
Innovation Solution
The terminal device determines the paging type based on information within the received message, such as identification information or resource usage, configured by the network or agreed upon by a protocol, to differentiate between access network and core network paging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device receives a paging message without determining the paging type, then the terminal device can maintain connection with the core network, but the terminal device cannot determine the correct state transition or response behavior
Solution Approach 1:
The paging message is segmented into different types (RAN paging and CN paging) with distinct identification mechanisms. The terminal device determines the paging type by checking specific fields: RAN paging uses a specific RNTI (Radio Network Temporary Identifier) for scrambling, while CN paging uses a different RNTI or includes explicit paging cause indicators. This segmentation allows the terminal to correctly identify the paging type and execute appropriate state transitions.
Solution Approach 2:
The patent introduces an intermediary identification mechanism (RNTI or paging cause indicator) that mediates between the paging message and the terminal device's response behavior. This intermediary element carries the paging type information, enabling the terminal to distinguish between RAN paging (requiring state transition to active) and CN paging (requiring response message transmission).
2Reliability
If the terminal device always transitions to active state for paging, then the terminal can receive downlink data, but energy is wasted when core network paging is received
Solution Approach 1:
The terminal device dynamically adjusts its state transition behavior based on the paging type identification. When RAN paging is detected (through RNTI checking or paging cause indication), the terminal transitions from inactive to active state to receive downlink data. When CN paging is detected, the terminal remains in the current state and only transmits a response message, avoiding unnecessary state transitions and energy consumption.
Solution Approach 2:
The patent changes the operational parameters of the terminal device based on the paging type. For RAN paging, the terminal changes its connection state parameter from inactive to active. For CN paging, the terminal maintains its state parameter and only changes the messaging behavior (sending response). This parameter-based differentiation optimizes energy usage while ensuring proper data reception.
3Reliability
If the terminal device sends response message for all paging, then the core network can track terminal location, but unnecessary signaling overhead is generated
Solution Approach 1:
The patent applies partial action by having the terminal device send response messages only when necessary (for CN paging) rather than for all paging messages. The terminal identifies CN paging through specific indicators and sends response messages only in those cases, while for RAN paging, the terminal executes state transitions without sending response messages, reducing overall signaling overhead while maintaining location tracking capability where needed.
Data Source
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AI summary
Embodiments of the present application provide a communication method, a terminal device, and an access network device, which may determine a paging type of a received message. The method includes: the terminal device receives a first message sent by an access network device; and the terminal device determines a paging type according to the first message.