Skipping Uplink Transmissions via HARQ Buffer Flushing
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a need to efficiently manage uplink transmissions to reduce costs, improve service availability, and optimize power consumption, as existing methods often result in unnecessary data transmission when no data is available, leading to increased interference and battery inefficiency.
Innovation Solution
A method where User Equipment (UE) flushes the hybrid automatic repeat and request (HARQ) buffer and does not fill it with padding-only medium access control protocol data units (MAC PDU) if no data is available for transmission, allowing the UE to skip uplink grants, thereby reducing unnecessary transmissions and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits uplink data using allocated resources, then the data transmission is performed, but unnecessary transmissions occur when no data is available, increasing interference and power consumption
Solution Approach 1:
The patent applies the skipping principle by enabling the UE to skip uplink transmissions when no data is available for transmission. The UE determines whether to skip transmission based on buffer status and transmission configuration, avoiding unnecessary transmissions that would cause interference. This is implemented through the transmission manager that controls skipping of PUSCH transmissions when the buffer is empty or contains only padding data.
2Reliability
If the UE transmits padding-only MAC PDU to maintain protocol compliance, then the transmission protocol is followed, but battery efficiency decreases due to unnecessary transmissions
Solution Approach 1:
The patent enables the UE to skip transmissions of padding-only MAC PDUs by implementing intelligent buffer status checking before transmission. The UE determines whether to transmit based on whether the buffer contains actual data or only padding, allowing protocol compliance to be maintained while avoiding unnecessary energy consumption from transmitting empty or padding-only packets.
Solution Approach 2:
The patent changes the transmission parameter from always transmitting to conditionally transmitting based on buffer status. The transmission decision is dynamically adjusted by monitoring buffer contents and determining whether to transmit actual data, padding-only data, or skip transmission entirely, thereby optimizing battery efficiency while maintaining necessary protocol operations.
3Object-generated harmful factors
If the UE flushes the HARQ buffer when no data is available, then unnecessary transmissions are avoided, but the HARQ buffer management complexity increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously manage its HARQ buffer based on its own buffer status information. The UE independently determines when to flush the HARQ buffer by monitoring its own data availability, eliminating the need for complex network-controlled buffer management while avoiding unnecessary transmissions. The transmission manager uses self-reported buffer status to make transmission decisions.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for skipping an UL transmission in a wireless system, the method comprising: receiving a RRC signaling configuring that the UE skips an UL transmission if there is no data available for transmission, receiving an UL grant for new transmission for a HARQ process, and discarding an old MAC PDU in a HARQ buffer of the HARQ process without storing any new MAC PDU in the HARQ buffer, if there is no data available for transmission.