Self-Reportable RLC Status PDU Segmentation Under Grant Limits
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Solution Overview
Problem
In power-limited or grant-limited conditions, wireless communication networks face challenges in transmitting complete Radio Link Control (RLC) status PDUs due to insufficient bandwidth, leading to failed error recovery procedures in RLC acknowledged mode.
Innovation Solution
Implementing mechanisms for reporting the complete status of an RLC receiving window using multiple self-reportable RLC status reports, allowing segmentation of status information across multiple PDUs to ensure accurate delivery and synchronization between transmitting and receiving devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete RLC status PDU is transmitted in a single PDU, then error recovery accuracy is improved, but transmission reliability deteriorates under power-limited or grant-limited conditions
Solution Approach 1:
The patent segments the complete RLC status PDU into multiple partial status PDUs, each containing status information for a specific portion of the receiver buffer window. This segmentation allows the status information to be transmitted in smaller, more reliable units that can be successfully delivered even under power-limited or grant-limited conditions, while still providing complete error recovery capability when all segments are reassembled at the transmitter.
2Reliability
If status information is segmented across multiple PDUs, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the transmitter sends an indication to the receiver about which portion of the receiver buffer window the status report covers. This feedback loop enables the receiver to segment status information appropriately and the transmitter to reassemble the complete status by combining multiple partial status PDUs, managing the increased complexity through structured information exchange.
Solution Approach 2:
Each partial status PDU is designed to be self-contained with explicit indication of its coverage range within the buffer window. This self-service approach allows the receiver to independently determine which portion of the window each status report addresses, and enables the transmitter to autonomously reassemble the complete status without requiring complex coordination protocols.
3Measurement precision
If multiple partial status PDUs are transmitted, then complete status delivery is ensured, but loss of time increases due to multiple transmissions
Solution Approach 1:
The patent employs partial action by transmitting only the necessary portions of status information in separate PDUs rather than attempting to transmit the complete status in a single PDU. This approach accepts multiple transmissions as a trade-off to ensure that status information is successfully delivered even when channel conditions are poor, with each partial transmission having a higher probability of successful delivery.
Data Source
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AI summary
Wireless communication systems and methods related to radio link control (RLC) transmissions are provided. A first wireless communication device transmits a sequence of protocol data units (PDUs). The first wireless communication device receives a first reception status report for a first portion of a receiver buffer window used for receiving the sequence of PDUs from a second wireless communication device. The first wireless communication device receives a second reception status report for a second portion of the receiver buffer window, the second portion being different from the first portion, from the second wireless communication device.