SDAP Entity Segmentation for Sidelink QoS in 5G D2D
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Solution Overview
Problem
Current 5G communication systems face challenges in providing seamless services, particularly in device-to-device (D2D) communication systems, where ensuring quality of service (QoS) and in-order packet delivery without a D2D unicast link configuration is essential for effective sidelink communication.
Innovation Solution
The implementation of a service data adaptation protocol (SDAP) layer function in wireless communication systems, which includes determining the type of core network connection, activating or deactivating the SDAP layer, and configuring or releasing SDAP entities based on sidelink communication requirements, supports in-order packet delivery and QoS in D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SDAP layer function is activated to support QoS and in-order packet delivery in D2D communication, then service quality and reliability are improved, but device complexity and protocol overhead increase
Solution Approach 1:
The patent segments the SDAP layer functionality into separate entities (SDAP entities) that can be independently activated or deactivated based on communication requirements. Each SDAP entity handles specific QoS flows, allowing selective activation of in-order delivery functionality only where needed, rather than applying it system-wide.
Solution Approach 2:
The patent implements dynamic activation and deactivation of SDAP entities based on communication conditions. The SDAP layer can be activated when QoS requirements demand in-order delivery and deactivated when such requirements are not present, allowing the system to adapt its complexity to actual needs.
2Reliability
If SDAP layer function is activated for all D2D communications, then QoS support is improved, but system overhead and processing burden increase
Solution Approach 1:
The patent applies partial action by activating SDAP entities only for specific QoS flows that require in-order delivery, rather than applying the SDAP layer to all D2D communications. This selective approach ensures QoS support where needed while avoiding unnecessary processing overhead for traffic that does not require such guarantees.
Solution Approach 2:
The patent changes the operational parameters of the SDAP layer by allowing dynamic activation and deactivation of SDAP entities. This enables the system to adjust the level of QoS processing based on traffic requirements, reducing energy consumption when high-reliability delivery is not needed.
3Reliability
If SDAP entities are configured for each QoS flow to ensure in-order delivery, then packet delivery reliability is improved, but configuration complexity and signaling overhead increase
Solution Approach 1:
The patent segments QoS flow handling into separate SDAP entities, where each entity is responsible for specific QoS flows requiring in-order delivery. This segmentation allows independent configuration and management of each entity, reducing the complexity of managing all QoS flows within a single monolithic structure.
Solution Approach 2:
The SDAP entity acts as an intermediary layer between the upper layers and the radio bearer, managing QoS flow to radio bearer mapping and ensuring in-order delivery. This intermediary structure simplifies configuration by providing a standardized interface for QoS management without requiring complex direct configurations between upper layers and physical transmission.
Data Source
AI summary
Provided are a method and apparatus for performing communication between terminals in a wireless communication system, and an operation method of a first terminal in a wireless communication system, includes: determining to establish or release a service data adaptation protocol (SDAP) entity related to sidelink communication, based on SDAP configuration information related to the sidelink communication, wherein the SDAP entity is configured for each of a destination identifier and a cast type; and establishing or releasing the SDAP entity, based on a result of the determining.