PDCP Status Report Segmentation for 32 Component Carriers
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Solution Overview
Problem
The extension of sequence number length in PDCP PDU in LTE systems leads to increased size of PDCP status reports, causing processing delays and potential overload in UE devices, especially during handovers or reconnections, as existing systems struggle to handle large status reports efficiently without requiring significant improvements in processing capacity.
Innovation Solution
A radio communication device and method that generates and transmits status reports by deleting or splitting excess data when the size exceeds a predetermined threshold, allowing for efficient retransmission control in the PDCP layer without increasing UE processing capacity, by including indicators to manage report size and content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sequence number length in PDCP PDU is extended to support up to 32 component carriers, then the peak throughput is improved, but the size of PDCP status report increases causing processing delays and potential overload in UE devices
Solution Approach 1:
The PDCP status report is divided into multiple segments, each fitting within the maximum PDCP PDU size limit. The status report includes a segmentation indicator to help the receiving end reconstruct the complete status information from multiple transmitted segments, thereby preventing processing delays while supporting extended sequence numbers for 32 component carriers
Solution Approach 2:
The patent changes the parameter of sequence number length in PDCP PDU from the traditional format to an extended format that supports up to 32 component carriers. This parameter change enables higher peak throughput through carrier aggregation while the status report segmentation mechanism ensures that the increased size does not cause processing overload in UE devices
2Productivity
If the sequence number length in PDCP PDU is extended to support up to 32 component carriers, then the peak throughput is improved, but the processing capacity of UE devices is overloaded
Solution Approach 1:
The large PDCP status report resulting from extended sequence numbers is segmented into multiple smaller PDCP PDUs that can be processed individually by UE devices. This segmentation reduces the processing burden on UE devices while still transmitting the complete status information needed for retransmission control across 32 component carriers
Solution Approach 2:
The patent uses lightweight segmentation indicators and control mechanisms that add minimal processing overhead. These control elements are designed to be efficiently processed and discarded after serving their purpose in retransmission control, avoiding long-term storage or complex processing in UE devices
Data Source
AI summary
A radio communication device is disclosed that transmits and receives protocol data units in a packet data convergence protocol layer located above a radio link control layer. The radio communication device includes a processor that generates a status report indicating reception status of the protocol data units in the packet data convergence protocol layer and a transmitter that transmits the status report in the packet data convergence protocol layer to a destination radio communication device. If a size of a protocol data unit that includes the status report exceeds a predetermined threshold, the processor sets the size of the protocol data unit to the predetermined threshold and the transmitter transmits the protocol data unit having the set size to the destination radio communication device.