Uplink Data Compression in NR PDCP Layer for MRDC
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Solution Overview
Problem
Current uplink data compression methods are not supported in new radio (NR) networks, which limits the improvement of uplink capacity and user experience, as the NR protocol stack differs from LTE, requiring distinct methods for effective integration of uplink data compression.
Innovation Solution
Implementing uplink data compression (UDC) at the packet data convergence protocol (PDCP) layer in the NR protocol stack, where data is compressed at the transmitter before routing and decompressed at the receiver, with support for multiple radio access technology dual connectivity and split bearers, enabling efficient data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink data compression is implemented in NR network, then uplink capacity is improved, but device complexity increases due to different NR protocol stack processes
Solution Approach 1:
The patent applies preliminary action by performing UDC compression at the PDCP layer before data routing and switching operations. The transmitter compresses data packets upfront, and the receiver reorders packets before decompression, preparing data in advance to avoid complexity during critical transmission paths.
Solution Approach 2:
The patent segments the UDC implementation by configuring separate UDC protocol stacks for different bearers (MRDC, split bearers, DAPS bearers). Each bearer type can have independent UDC configuration, allowing selective application of compression algorithms to specific data flows without affecting the entire protocol stack.
2Adaptability or versatility
If UDC is integrated with wide range of applications in NR, then user experience is improved, but implementation complexity increases for supporting MRDC and split bearers
Solution Approach 1:
The patent implements a universal UDC framework at the PDCP layer that can serve multiple bearer types (MRDC, split bearers, DAPS bearers) and different radio access technologies simultaneously. The same compression infrastructure handles diverse application requirements through configurable parameters rather than separate implementations.
Solution Approach 2:
The patent applies local quality by allowing different UDC configurations for different bearers and cell groups. Each bearer can have optimized compression settings tailored to its specific requirements, while the overall system maintains a unified UDC mechanism. This enables customized compression strategies for specific applications without redesigning the entire system.
3Productivity
If data is compressed before routing at PDCP layer, then transmission efficiency is improved, but packet reordering complexity increases at receiver
Solution Approach 1:
The receiver performs packet reordering before decompression operations. By reordering compressed packets first based on their sequence information, the system prepares data in the correct sequence before applying decompression, which simplifies the decompression process and maintains transmission efficiency.
Data Source
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AI summary
Apparatus and methods are provided to support uplink data compression, UDC, in NR protocol stack. In one novel aspect, UDC is performed at the transmitter side at the packet data convergence protocol, PDCP, layer before packets routing and uplink switching. At the receiver side, the receiver performs reordering before decompresses the UDC packets. In one embodiment, transmitting UE (103) is configured with multiple radio access technology, RAT, dual connectivity, MRDC, with a master cell group and a secondary cell group, and wherein the PDCP entity of the UE (103) performs UDC data compression for the MRDC before routing. In another embodiment, the transmitter configures two UDC protocol stacks when a DAPS bearer is configured. The transmitting device generates UDC compressed data packets and performs UDC with the target cell configuration when UL data switching is received from lower layer.