UL Data and DL Feedback Merging in Wireless MAC PDU
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Solution Overview
Problem
In wireless communication systems, especially in 3GPP LTE and NR, there is a need to efficiently combine uplink (UL) data with feedback of downlink (DL) data to optimize transmission efficiency and power consumption, particularly when the wireless device is unsure if UL data will be transmitted as a response to DL data.
Innovation Solution
A wireless device receives information from the network indicating whether UL data is expected subsequent to DL data, initiates a random access procedure, and transmits UL signaling including both application-level UL data and feedback of DL data based on this information, allowing for simultaneous transmission of UL data and feedback in the same MAC PDU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device transmits feedback of DL data and subsequent UL data in separate transmissions, then the transmission reliability is improved, but the power consumption increases and transmission efficiency decreases
Solution Approach 1:
The patent combines feedback of DL data and UL data into a single MAC PDU for transmission. The MAC PDU includes a first MAC layer PDU containing feedback information and a second MAC layer PDU containing UL data, allowing both to be transmitted together in one uplink transmission rather than separately, thereby reducing power consumption while maintaining transmission reliability
2Reliability
If the wireless device transmits feedback of DL data and subsequent UL data in separate transmissions, then the data integrity is improved, but the radio resource usage increases and transmission efficiency decreases
Solution Approach 1:
The patent merges feedback information and UL data into a single MAC PDU structure. The MAC PDU comprises a first MAC layer PDU for feedback and a second MAC layer PDU for UL data, enabling both to be transmitted in one uplink opportunity, thus improving transmission efficiency by reducing the number of separate transmissions required while preserving data integrity through proper MAC layer handling
3Reliability
If the wireless device performs additional UL transmission for application-level reply, then the communication completeness is improved, but the transmission complexity increases
Solution Approach 1:
The patent combines the application-level UL data with the feedback transmission in a single MAC PDU. The MAC PDU structure includes a first MAC layer PDU containing feedback and a second MAC layer PDU containing the application-level UL data, allowing the device to respond to DL data and send application data simultaneously, thereby improving communication completeness while simplifying the transmission process by eliminating the need for separate transmission procedures
Data Source
AI summary
A method and apparatus for combining UL data with a feedback of DL data in a wireless communication system is provided. A wireless device receives, from a network, information informing whether an application level uplink (UL) data, subsequent to a downlink (DL) data, is expected or not. A wireless device initiates random access procedure. A wireless device receives, from the network, the DL data in the random access procedure. A wireless device transmits a UL signaling including both the application level UL data and a feedback of the DL data based on the information informing that the application level UL data subsequent the DL data is expected.