Dynamic MAC PDU Generation for Overlapping Uplink Grants
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Solution Overview
Problem
In wireless communication systems, the challenge is to efficiently process data units in conflicted resources, particularly addressing the issue of MAC Control Element (CE) loss due to overlapping transmission times and priority conflicts between data units.
Innovation Solution
A method where a user equipment (UE) generates a first MAC Protocol Data Unit (PDU) including at least one MAC Control Element (CE) and data, and upon receiving an uplink grant for transmitting a second data with higher priority, the UE generates a second MAC PDU including the MAC CE and the second data, ensuring the MAC CE is transmitted even if the first PDU is deprioritized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits the first MAC PDU containing MAC CE at the scheduled transmission time, then the MAC CE transmission is performed according to initial scheduling, but the MAC CE may be lost when transmission time overlaps with higher priority data
Solution Approach 1:
The patent implements dynamic MAC PDU generation by detecting overlapping transmission times between first MAC PDU (containing MAC CE) and second MAC PDU (containing higher priority data). When overlap is detected, the system dynamically adjusts the transmission strategy by generating an alternative second MAC PDU that includes both the MAC CE and higher priority data, ensuring reliable MAC CE transmission while maintaining data transmission efficiency.
Solution Approach 2:
The patent changes the composition parameter of the MAC PDU based on priority and timing conditions. When transmission time overlap is detected, the system transforms the MAC PDU structure by incorporating MAC CE into the second MAC PDU alongside higher priority data, rather than transmitting them as separate entities. This parameter change ensures both reliability of MAC CE transmission and efficiency of data transmission.
2Productivity
If the UE prioritizes transmission of higher priority data in overlapping resources, then data transmission efficiency is improved, but MAC CE may be lost
Solution Approach 1:
The patent merges the MAC CE and higher priority data into a single second MAC PDU when transmission time overlap is detected. By combining these elements that would otherwise conflict in resource allocation, the system achieves both goals: higher priority data is transmitted efficiently without delay, and the MAC CE is simultaneously included in the same transmission, ensuring its reliability. This merging eliminates the need to choose between the two competing requirements.
3Ease of operation
If the UE generates separate MAC PDUs for MAC CE and data, then clear separation of control and data is achieved, but resource conflict occurs when transmission times overlap
Solution Approach 1:
The patent implements a dynamic MAC PDU generation approach that adapts the PDU structure based on transmission conditions. When no overlap is detected, separate MAC PDUs maintain clear structure. When overlap is detected, the system dynamically creates a unified second MAC PDU containing both MAC CE and higher priority data, resolving the resource conflict while maintaining operational clarity through condition-based structure selection.
Data Source
AI summary
The present invention relates to a method of transmitting a Medium Access Control (MAC) Protocol Data Unit (PDU) by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of generating a first MAC PDU including at least one MAC Control Element (CE) and a first data; receiving an uplink grant for transmitting a second data, wherein a transmission time of the first data overlaps with a transmission time of the second data, and wherein a priority of the second data is higher than a priority of the first data; generating a second MAC PDU including the at least one MAC CE and the second data; and transmitting the second MAC PDU.