UE BSR Retention for Uplink Data Transmission Delay Reduction
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Solution Overview
Problem
The existing BSR mechanism in data transmission systems introduces a significant delay due to the timeout of the BSR retransmission timer when uplink data transmission fails, leading to prolonged data transmission delays.
Innovation Solution
The user equipment (UE) retains the BSR or SR until feedback information is received from the network side device, allowing it to continue requesting uplink resources for unsuccessful data transmission, thereby avoiding delays associated with the BSR retransmission timer timeout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current BSR mechanism is used where BSR is canceled after uplink data transmission, then the system follows the established protocol flow, but when transmission fails the UE must wait for BSR retransmission timer timeout (320ms-1024ms) causing long data transmission delay
Solution Approach 1:
The patent makes the BSR cancellation dynamic by linking it to transmission success feedback. Instead of always canceling BSR after uplink data transmission, the UE now conditionally cancels BSR only when it receives ACK feedback indicating successful transmission. When NACK is received indicating failure, the BSR is retained and can be retriggered without waiting for the BSR retransmission timer timeout, thus adapting the protocol behavior to actual transmission outcomes.
Solution Approach 2:
The patent introduces feedback-driven BSR management where the UE's BSR cancellation decision is based on receiving ACK/NACK feedback from the base station. The feedback information about transmission success or failure directly controls whether the BSR is canceled or retained, enabling the system to respond to actual transmission outcomes rather than following a fixed timeout-based procedure.
2Stability of the object's composition
If the BSR retransmission timer timeout mechanism is used for failed transmissions, then the system maintains a controlled retransmission process, but it introduces a prescribed delay of 320ms-1024ms before the UE can trigger another BSR and obtain scheduling opportunity
Solution Approach 1:
The patent enables preliminary BSR retriggering by retaining the BSR when transmission fails. Instead of waiting for the BSR retransmission timer to timeout before attempting retransmission, the UE can immediately retrigger the BSR using the retained buffer status information, thus performing the retransmission request action earlier than the timeout mechanism would allow.
3Device complexity
If the UE immediately cancels BSR after sending uplink data, then the protocol flow is simplified, but when transmission fails due to false alarm or insufficient base station demodulation capability, the UE cannot quickly request retransmission resources
Solution Approach 1:
The patent uses feedback from the base station about transmission success or failure to control BSR cancellation. The UE receives feedback information indicating whether the base station correctly received the uplink data, and this feedback directly determines whether the BSR is canceled or retained. This feedback mechanism ensures reliable retransmission by preventing premature BSR cancellation when transmission actually failed.
Data Source
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AI summary
The present invention discloses a data transmission method and user equipment, where the method includes: sending, by user equipment UE, uplink data to a network side device; and processing, by the UE according to feedback information for the uplink data and received from the network side device, a buffer status report BSR corresponding to the uplink data or a scheduling request SR corresponding to the uplink data. By using the method, an uplink data transmission delay due to a wait for timeout of a BSR retransmission timer can be avoided.