Uplink PDU Truncation for 5G Channel Adaptation
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Solution Overview
Problem
In wireless communication networks, especially in 5G wireless technology, the degradation of channel conditions between user equipment (UE) and base stations poses a challenge for efficient uplink transmission, as large packet data units (PDUs) may exceed allocated uplink resources, leading to transmission failures and increased recovery times when channel conditions improve.
Innovation Solution
The implementation of a mechanism to generate a truncated PDU by selecting a truncation point from a set of indicated truncation points, allowing the Medium Access Control (MAC) layer to remove a portion of the PDU to match the reduced uplink transmission size, thereby ensuring efficient transmission and reducing recovery time when channel conditions improve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the PDU size is maintained at its original large size, then the data transmission capacity is improved, but the transmission reliability deteriorates when channel conditions degrade and uplink resources are reduced
Solution Approach 1:
The patent implements dynamic PDU size adjustment by introducing multiple truncation points within the PDU structure. The MAC layer can dynamically select different truncation points based on current channel conditions and uplink grant sizes, transforming the static PDU size into a dynamic parameter that adapts to varying transmission conditions, thus resolving the contradiction between maintaining large data capacity and ensuring reliable transmission under resource constraints
Solution Approach 2:
The patent segments the PDU by defining multiple truncation points (first truncation point, second truncation point, etc.) at different positions within the PDU. This segmentation allows the MAC layer to selectively truncate the PDU at appropriate points based on available uplink resources, enabling the system to maintain optimal data transmission capacity while ensuring reliability under different channel conditions
2Reliability
If the PDU is truncated to fit reduced uplink transmission size, then the transmission reliability is improved, but the data transmission capacity deteriorates
Solution Approach 1:
The patent employs dynamic truncation point selection where the MAC layer chooses among multiple predefined truncation points based on the actual uplink grant size received. This dynamic approach ensures that the PDU is truncated to the maximum possible size that fits the available resources, thereby maximizing data transmission capacity while maintaining transmission reliability under reduced resource conditions
3Device complexity
If a fixed truncation mechanism is used, then the device complexity is reduced, but the adaptability to varying channel conditions and uplink grants deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple truncation points within the PDU structure before transmission. These truncation points are prepared in advance at different positions within the PDU, allowing the MAC layer to quickly select an appropriate truncation point based on received uplink grants without complex real-time processing, thus maintaining low device complexity while achieving high adaptability to varying channel conditions
Solution Approach 2:
The patent changes the parameter of truncation point position to adapt to different channel conditions and uplink grant sizes. By having multiple predefined truncation points at different positions within the PDU, the system can adjust the effective PDU size by selecting different truncation points, achieving adaptability without requiring complex real-time modifications to the PDU structure
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for a user equipment (UE) to send a portion of a packet data unit (PDU) to a base station. A radio link control (RLC) layer of the UE generates a PDU and a truncation indicator, where the truncation indicator can indicate a set of truncation points of the PDU. A medium access control (MAC) layer determines whether an uplink transmission size based on an uplink grant is smaller than a first number of bytes included in the PDU. In response to a determination that the uplink transmission size is smaller than the first number of bytes, the MAC layer selects a truncation point from the set of truncation points indicated by the truncation indicator, and remove at least a portion of the PDU to generate a truncated PDU having a second number of bytes smaller than the uplink transmission size.