Downlink Data Transmission via Paging Message for Inactive UEs
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Solution Overview
Problem
In wireless communication systems, data transmission delays occur when User Equipments (UEs) are in an inactive state, as they need to enter a Radio Resource Control (RRC) connected state and acquire a unique air-interface transmission identifier like C-RNTI to receive data, leading to slower data transfer.
Innovation Solution
A downlink data transmission method that involves transmitting a paging message to a UE with an inactive UE ID and a unique air-interface transmission identifier, allowing the UE to receive data without needing to enter an RRC connected state, thereby reducing data transmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE enters RRC connected state to acquire C-RNTI for data transmission, then the data transmission can be performed with unique air-interface identifier, but the data transmission delay increases due to the state transition procedure
Solution Approach 1:
The network allocates and stores a dedicated air-interface transmission identifier (such as C-RNTI) for the UE in advance while the UE is in inactive state. When downlink data needs to be transmitted, the network can directly use the pre-allocated identifier without requiring the UE to first transition to RRC connected state and acquire the identifier, thereby eliminating the state transition delay while ensuring reliable data transmission.
2Use of energy by moving object
If the UE remains in inactive state to save power and network resources, then power consumption is reduced, but the network cannot directly schedule air interface for data transmission
Solution Approach 1:
The patent introduces a paging message as an intermediary mechanism that carries the pre-allocated air-interface transmission identifier and downlink data to the UE in inactive state. This paging message acts as a mediator between the network and the UE, enabling the network to deliver data directly to the UE without requiring the UE to transition to connected state, thus maintaining low power consumption while enabling rapid data transmission.
3Ease of operation
If the network uses inactive UE ID for identification in inactive state, then the UE can maintain connection without air interface connection, but the network cannot directly transmit data without additional state transition
Solution Approach 1:
The patent makes the paging message serve multiple functions: it identifies the UE using the inactive UE ID, transmits the pre-allocated air-interface transmission identifier, and delivers the downlink data simultaneously. This multi-functional approach allows the network to maintain the UE's connection in inactive state while enabling direct data transmission without requiring state transition, thus resolving the contradiction between ease of operation and transmission speed.
Data Source
AI summary
A downlink data transmission method and a downlink data transmission device are provided. The downlink data transmission method includes: transmitting a paging message to a UE which has not been connected to any individual cell when downlink data is to be transmitted to the UE; and notifying the UE to receive the downlink data.