RLC Polling for IoT Data Transfer Overhead Reduction
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Solution Overview
Problem
The existing LTE protocols, particularly in Control Plane CIoT EPS Optimization, incur time-consuming and overhead-intensive polling procedures for data transmission, which are suboptimal for IoT applications involving small and infrequent data transfers.
Innovation Solution
An enhanced polling scheme is introduced where the UE RLC performs concurrent polling for multiple NAS PDUs instead of individual PDUs, reducing the need for repeated Status PDU exchanges and allowing data transmission to proceed without waiting for acknowledgement of previous PDUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE RLC performs polling for each NAS PDU individually, then the transmission reliability is ensured, but the transmission time and overhead increase significantly
Solution Approach 1:
The patent merges multiple individual polling operations into a single consolidated polling mechanism. Instead of setting the poll bit for each NAS PDU separately and receiving multiple Status PDUs, the enhanced polling procedure combines the status inquiry for multiple PDUs into one single Status PDU exchange, thereby reducing time loss while maintaining reliability
Solution Approach 2:
The single Status PDU is designed to serve multiple functions simultaneously - it provides status information for multiple NAS PDUs that would traditionally require multiple separate status requests. This multi-functional approach allows the network to confirm delivery of multiple packets in one response, reducing the overall polling time
2Reliability
If the UE RLC waits for individual acknowledgments for each NAS PDU, then the data integrity is ensured, but the productivity decreases due to sequential transmission
Solution Approach 1:
The patent implements preliminary action by allowing the UE to prepare and transmit multiple NAS PDUs in advance without waiting for individual acknowledgments. The enhanced polling mechanism at the network side confirms receipt of multiple PDUs in a single Status PDU, enabling the UE to pipeline transmissions and improve productivity while maintaining integrity through comprehensive status reporting
Solution Approach 2:
The enhanced polling procedure enables continuous data transmission by eliminating the sequential waiting period between individual acknowledgments. Multiple NAS PDUs can be transmitted and acknowledged in a continuous flow within a single polling cycle, maintaining useful transmission action without interruption and significantly improving productivity
3Loss of information
If the polling procedure uses individual Status PDUs for each PDU, then the status information completeness is ensured, but the overhead increases
Solution Approach 1:
The patent merges multiple individual Status PDUs into a single consolidated Status PDU that contains status information for multiple NAS PDUs. This combining approach maintains complete status information by including delivery status for all polled PDUs in one message, thereby reducing overhead while preserving information completeness
Solution Approach 2:
The single Status PDU is designed with multi-functionality to serve as a universal response that can acknowledge multiple NAS PDUs simultaneously. It provides comprehensive status information for all polled packets in one structure, eliminating the need for multiple separate status messages and reducing overall overhead while maintaining complete information
Data Source
AI summary
A device for wireless communications includes one or more protocol processors for executing a protocol stack, the one or more protocol processors configured to generate a first RLC (Radio Link Control) PDU (Protocol Data Unit) with data from a first upper-layer PDU and transmit the first RLC PDU to a counterpart base station RLC, generate a second RLC PDU, with its poll bit set, with data from a second upper-layer PDU and transmit the second RLC PDU to the counterpart base station RLC, and receive a status PDU from the counterpart base station RLC that indicates a status of the first and second RLC PDUs.