PDCP Duplication Buffer Management for 5G Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in next-generation 5G networks, face challenges in effectively implementing Packet Data Convergence Protocol (PDCP) duplication operations, which are crucial for enhancing data transmission reliability and reducing latency, due to a lack of detailed methodologies for performing these operations.
Innovation Solution
A method and device for PDCP duplication operations involve receiving duplication assistance information, duplicating a first PDCP Protocol Data Unit (PDU) to create a second PDCP PDU, submitting both PDUs to different Radio Link Control (RLC) entities, and discarding the second PDU based on the assistance information to optimize transmission reliability and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP duplication is implemented to increase transmission reliability, then data transmission reliability is improved, but device complexity and buffer management overhead increase
Solution Approach 1:
The patent implements PDCP duplication by creating a copy of the first PDCP PDU to generate a second PDCP PDU. This copying mechanism enables transmission through multiple independent paths (first and second RLC entities), thereby improving reliability without requiring fundamentally new transmission mechanisms, only systematic duplication and management of existing PDCP PDUs.
Solution Approach 2:
The patent introduces a buffer management mechanism where the second PDCP PDU is discarded based on duplication assistance information received from the network. This selective discarding prevents buffer overflow and manages complexity by systematically removing duplicate data when it is no longer needed for reliability purposes, balancing the reliability benefit against the complexity cost.
2Loss of time
If PDCP duplication is implemented to reduce latency, then data transmission latency is reduced, but buffer management overhead increases
Solution Approach 1:
The patent performs duplication of the first PDCP PDU before transmission, creating the second PDCP PDU in advance. This preliminary action allows both duplicated PDUs to be submitted to different RLC entities simultaneously, reducing latency by avoiding sequential transmission while the buffer management mechanism handles the overhead systematically.
Solution Approach 2:
The buffer management mechanism discards the second PDCP PDU based on duplication assistance information, preventing unnecessary buffer retention and reducing buffer management overhead. This systematic discarding approach balances the need for rapid data transmission (low latency) with the need to manage buffer resources efficiently.
3Adaptability or versatility
If detailed methodologies for PDCP duplication are not established, then implementation flexibility is maintained, but transmission reliability and latency performance deteriorate
Solution Approach 1:
The patent introduces duplication assistance information as a configurable parameter that controls the PDCP duplication process. This parameter allows the system to adapt the duplication behavior (when to duplicate, when to discard) based on network conditions and requirements, maintaining implementation flexibility while achieving reliable transmission through systematic parameter-driven control of the duplication and discarding processes.
Data Source
AI summary
A method for wireless communications is provided. The method includes receiving, by a communication device, duplication assistance information from a network, wherein the communication device is configured with a first Radio Link Control (RLC) entity and a second RLC entity; duplicating, by the communication device, a first PDCP Protocol Data Unit (PDU) to create a second PDCP PDU that is a copy of the first PDCP PDU; submitting, by the communication device, the first PDCP PDU and the second PDCP PDU to the first RLC entity and the second RLC entity, respectively; and discarding, by the communication device, the second PDCP PDU in a buffer of the second RLC entity based on the duplication assistance information.