PDCP Out-of-Order Delivery in D2D Sidelink
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently processing out-of-order delivery in the packet data convergence protocol (PDCP) layer, particularly in device-to-device (D2D) communication systems.
Innovation Solution
The proposed solution involves an apparatus and method for processing out-of-order delivery in the PDCP layer of a wireless D2D communication system. This is achieved by transmitting sidelink capability information, including out-of-order delivery capability, from a first terminal to a second terminal, and then receiving and processing sidelink data based on the configured out-of-order delivery settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If out-of-order delivery is implemented in the PDCP layer for D2D communication, then data transmission efficiency is improved, but system complexity increases due to additional capability information exchange and configuration processing
Solution Approach 1:
The patent applies preliminary action by having terminals exchange out-of-order delivery capability information and receive configuration information before actual data transmission begins. This advance preparation allows the system to establish the necessary parameters and settings upfront, enabling efficient out-of-order delivery processing without adding complexity to the actual data transmission phase.
2Adaptability or versatility
If capability information and configuration information are exchanged between terminals, then out-of-order delivery processing is enabled, but signaling overhead increases
Solution Approach 1:
The patent merges the exchange of out-of-order delivery capability information with existing terminal capability information exchange procedures. By combining these signaling processes, the system enables out-of-order delivery functionality without requiring separate dedicated signaling messages, thereby reducing overall signaling overhead while maintaining full adaptability for out-of-order delivery processing.
Data Source
AI summary
According to an embodiment of the disclosure, provided are an operation method of a first user equipment (UE), and the first UE, in a wireless communication system. The operation method of the first UE includes: transmitting, to a second UE, UE sidelink capability information including out-of-order delivery capability information of a packet data convergence protocol (PDCP) layer of the first UE; and receiving, from the second UE, out-of-order delivery configuration information configured for a sidelink radio bearer, based on the out-of-order delivery capability information of the PDCP layer of the first UE. Also, the operation method of the first UE further includes processing sidelink data received from the second UE, based on the out-of-order delivery configuration information.