Wireless UE Control Circuit for RRC Message Retransmission
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Solution Overview
Problem
In conventional mobile communication systems, wireless user equipment (UE) is not permitted to retransmit Radio Resource Control (RRC) messages until a negative acknowledgement (NACK) is received, leading to delays and potential connection losses or call drops due to poor signal transmission quality.
Innovation Solution
The control circuit in the wireless UE actively retransmits important RRC messages before receiving a NACK, ensuring timely delivery by storing them in specific queues and retransmitting when an acknowledgement (ACK) is received or under poor signal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless UE waits for NACK before retransmitting RRC messages, then the system follows standard procedure and maintains protocol compliance, but the timing of receiving RRC messages at the network side is delayed causing connection lost or call drop
Solution Approach 1:
The wireless UE performs preliminary retransmission of RRC messages before receiving NACK from the network side. When signal quality falls below a threshold, the UE proactively retransmits important RRC messages (such as connection reconfiguration complete messages or measurement report messages) without waiting for the standard NACK feedback, thereby reducing message delivery delay and preventing connection loss.
2Reliability
If the wireless UE actively retransmits RRC messages before receiving NACK, then the message delivery timing is improved and connection stability is enhanced, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The control circuit is designed to apply different retransmission strategies to different RRC messages based on their importance and type. Important RRC messages (such as connection reconfiguration complete messages or measurement report messages) are selected for active retransmission when signal quality deteriorates, while other messages follow standard procedures. This localized differentiation reduces unnecessary complexity while maintaining reliability for critical communications.
Solution Approach 2:
The wireless UE autonomously monitors its own signal quality and independently decides when to retransmit RRC messages based on predefined thresholds and message importance criteria. The UE serves itself by detecting poor signal conditions and initiating retransmission without requiring external control signals, thereby simplifying the overall control mechanism while improving message delivery reliability.
3Reliability
If the wireless UE monitors signal quality and actively retransmits messages, then the likelihood of connection loss is reduced, but the energy consumption increases due to continuous monitoring and additional transmissions
Solution Approach 1:
The wireless UE performs partial active retransmission by selectively retransmitting only important RRC messages when signal quality falls below a threshold, rather than continuously monitoring and retransmitting all messages. This partial action approach reduces energy consumption compared to continuous monitoring while still maintaining connection reliability for critical communications during poor signal conditions.
Data Source
AI summary
A control circuit of a wireless user equipment includes: a message generating circuit configured to operably generate a target RRC (radio resource control) messages to be transmitted to a communication station through a wireless communication circuit of the wireless user equipment, wherein the target RRC message is a predetermined-type RRC message; and a data control circuit coupled with the message generating circuit and configured to operably transmit the target RRC message to the communication station through the wireless communication circuit, and to retransmit the target RRC message to the communication station through the wireless communication circuit at least one more time before a negative acknowledgement (NACK) corresponding to the target RRC message is received by the wireless communication circuit.