RRC Inactive Downlink Data Reception Feedback Mechanism
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Solution Overview
Problem
In 5G networks, terminals in the INACTIVE state cannot reliably receive downlink data without state switching, as existing technologies do not support this state, leading to uncertainty for the base station about successful data receipt, which affects user experience.
Innovation Solution
A method and device for a terminal to detect successful receipt of downlink data and generate a target signaling to the base station, allowing for retransmission when data is not received, and a corresponding method and device for the base station to resend data based on this signaling, ensuring data delivery in the INACTIVE state without state switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal remains in INACTIVE state without state switching, then energy consumption is reduced and service continuity is improved, but the base station cannot reliably determine whether downlink data is successfully received
Solution Approach 1:
The patent introduces a feedback mechanism where the terminal sends a first indication information to the base station to indicate whether downlink data is successfully received. This feedback loop allows the base station to obtain receipt confirmation without requiring the terminal to switch to CONNECTED state, thus resolving the contradiction between maintaining INACTIVE state and ensuring reliable data delivery confirmation.
Solution Approach 2:
The patent uses indication information as an intermediary carrier to transmit receipt confirmation from the terminal to the base station. This intermediary mechanism enables the base station to obtain feedback about data receipt status while the terminal remains in INACTIVE state, avoiding the need for state switching and maintaining both reliability and energy efficiency.
2Reliability
If the terminal switches from idle state to connected state before receiving downlink data, then data reception reliability is improved, but service continuity is disrupted and user experience deteriorates
Solution Approach 1:
The patent establishes a feedback mechanism where the terminal sends indication information to the base station to confirm data receipt. This allows the terminal to remain in INACTIVE state while still achieving reliable data reception through the feedback-based retransmission mechanism, eliminating the need for state switching and maintaining service continuity.
Solution Approach 2:
The patent changes the parameter of RRC state from requiring CONNECTED state to allowing INACTIVE state for data reception. By modifying the state parameter and introducing indication information for feedback, the system achieves reliable data reception without the need to switch states, thus improving service continuity and user experience.
3Reliability
If the base station resends downlink data when receipt is not confirmed, then data delivery reliability is improved, but transmission time is increased
Solution Approach 1:
The patent introduces a feedback mechanism where the terminal sends indication information to the base station to confirm data receipt. This feedback allows the base station to make informed retransmission decisions, sending data only when necessary and avoiding unnecessary retransmissions, thus improving reliability while minimizing time loss.
Solution Approach 2:
The patent implements preliminary action by having the terminal send indication information immediately after receiving downlink data. This preliminary feedback allows the base station to prepare for potential retransmission needs in advance, improving reliability while minimizing the time required for retransmission operations.
Data Source
AI summary
Provided are a method and device for receiving downlink data. The method includes: when a terminal is in a target status and receives downlink data sent by a base station, detecting whether the downlink data is successfully received or not and obtaining the detection result; generating target signaling for indicating the detection result; and sending the target signaling to the base station so that the base station resends the downlink data to the terminal when it is determined, according to the target signaling, that the terminal does not successfully receive the downlink data.