ADU Signaling for Missing SDU Detection in Wireless Links
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Solution Overview
Problem
Existing packet-based communication techniques in wireless multiple-access systems are deficient in handling application data units (ADUs), leading to inefficiencies in quality of service (QoS) determination and reliability.
Innovation Solution
Devices in the wireless communications system communicate based on shared ADU awareness, enabling proactive handling of absent service data units (SDUs) through retransmission requests or status indications, and signaling ADU awareness between distributed and centralized units via user plane interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing packet-based communication techniques are used, then communication can be established, but reliability in handling application data units is deficient
Solution Approach 1:
The patent implements feedback mechanisms where receiving devices monitor SDU reception status and send status reports or retransmission requests back to transmitting devices. This feedback loop enables proactive handling of missing ADUs by identifying absent SDUs and triggering appropriate retransmission actions, thereby improving reliability without requiring complete redesign of the communication protocol stack
Solution Approach 2:
The patent applies preliminary action by having devices proactively identify and report missing SDUs before the receiving device requests retransmission. The transmitting device anticipates potential data loss by monitoring expected SDU sequences and initiates retransmission procedures in advance, improving ADU handling reliability before communication failures occur
2Reliability
If proactive retransmission of absent SDUs is implemented, then ADU delivery reliability improves, but communication overhead increases
Solution Approach 1:
The patent implements partial action by selectively retransmitting only the specific absent SDUs that are identified through status reports, rather than retransmitting entire ADUs or all SDUs. This targeted approach ensures reliable delivery of missing data while minimizing unnecessary retransmission overhead and associated energy consumption
Solution Approach 2:
The patent changes the parameter of retransmission granularity from packet-level to SDU-level within ADUs. By identifying and retransmitting only the specific missing SDUs rather than entire packets or ADUs, the system optimizes the balance between delivery reliability and communication overhead, reducing energy waste on redundant transmissions
3Measurement precision
If ADU awareness signaling is implemented between DU and CU, then QoS determination accuracy improves, but interface complexity increases
Solution Approach 1:
The patent introduces an intermediary signaling mechanism at the user plane interface between DU and CU that carries ADU awareness information. This intermediary layer enables accurate QoS determination by providing the necessary ADU context without requiring complex direct coordination between DU and CU, as the signaling protocol handles the complexity of ADU tracking and status reporting
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A device (e.g., a user equipment (UE) or a base station) may communicate (e.g., receive or transmit) a set of service data units (SDUs) of an application data unit (ADU). The device may be aware of the set of SDUs corresponding to the ADU based on an identifier in a header of the set of SDUs. The device may determine that an SDU of the ADU is absent and proactively transmit a signal based on identifying the absent SDU. Signaling ADU awareness between distributed units (DUs) and a centralized unit (CU) of a base station is described. The CU may indicate that a set of SDUs correspond to an ADU via a user plane interface. For example, a header associated with the interface may include one or more bits identifying the ADU in a payload corresponding to the header.