Finally, we assume that the functional view is de ned rst, and the logical view is implemented based on the functional view. An example of this kind distribution given below. It defines how the functions will operate together to perform the system mission(s). Functional and Logical Structures: A Systems Engineering Approach 2011-01-0517 Mechatronics development continues to be a challenge for automotive OEM's and suppliers. Process, Functional Architecture, Logical Architecture, Technical Architecture, Model-Driven Architecture, Adaptive Cruise Control 1 Introduction Motivation. In the UL, FFT, and CP removal reside in the DU and for the two sub-variants, 7-1 and 7-2 are described below. Option 2-1 Split U-plane only (3C like split): In this split option, RRC, PDCP are in the central unit. RLC, MAC, physical layer and RF are in the distributed unit. Some of the benefits of an architecture with the deployment flexibility to split and move New Radio (NR) functions between central and distributed units are below: The choice of how to split New Radio (NR) functions in the architecture depends on some factors related to radio network deployment scenarios, constraints and intended supported services. Distributed Unit (DU): This logical node includes a subset of the gNB functions, depending on the functional split option. As a noun functional This allows efficient support of functions such as CoMP, MIMO, load balancing, mobility. This option requires some kind of compression technique to reduce transport bandwidth requirements between the DU and CU. Low RLC may be composed of segmentation functions; High RLC may be composed of ARQ and other RLC functions; Low RLC may be composed of transmitting TM RLC entity, transmitting UM RLC entity, a transmitting side of AM and the routing function of a receiving side of AM, which are related to downlink transmission. CU controls the operation of DUs over front-haul (Fs) interface. MAC, physical layer, and RF are in the distributed unit. Really, the only limitations are the performance and capabilities of the physical device. Unlike these, however, logical architecture is quite broad in scope. Thus the entire user plane is in the distributed unit. Option 7-1 In this option the UL, FFT, CP removal and possibly PRACH filtering functions reside in the DU, the rest of PHY functions reside in the CU. and measurements. In the DL, iFFT and CP addition functions reside in the DU, the rest of PHY functions reside in the CU. 5G NR gNB Logical Architecture and It’s Functional Split Options October 12, 2017 July 10, 2020 Author 5G , Cloud Computing , Future Network Optimization , LTE , NR , Tech Fundas The logical architecture of gNB is shown in figure below with Central Unit (CU) and Distributed Unit (DU). 3GPP TR 38.801 Radio Access Architecture and Interfaces Release 14. Network-2020 : Discussing Role of LTE-U/LAA,Indoor Small Cells and IOT with Mr. Oscar Bexell, 5G NR Radio Protocol Stack (Layer 2 and Layer 3), 5G Absolute Radio Frequency Channel Number (NR-ARFCN), Virtual Network’s Most Common Definitions. Option 2 (PDCP/RLC split): Option 2 may be a base for an X2-like design due to similarity on U-plane but some functionality may be different e.g. The logical architecture of gNB is shown in figure below with Central Unit (CU) and Distributed Unit (DU). In this architecture, Central Unit (CU) and Distribution Unit (DU) can be defined as follows. Flexible HW implementations allows scalable cost-effective solutions, A split architecture (between central and distributed units) allows for coordination for performance features, load management, real-time performance optimization, and enables NFV/SDN, Configurable functional splits enables adaptation to various use cases, such as variable latency on transport, Support of specific QoS per offered services (e.g. It includes a functional architecture, a behavioral architecture, and a temporal architecture [2]. • SysML activity diagrams can be used to fulfill this role and have the added advantage of being easily allocated to logical architectural variants. What is Inter Symbol Interference (ISI) in LTE, How Cyclic Prefix (CP) helps eliminating this problem ? is that functional is (computing) an object encapsulating a function pointer (or equivalent) while logical is (computing) non-physical or conceptual yet underpinned by something physical or actual. It includes a functional architecture, a behavioral architecture, and a temporal architecture. This means that these different … Generally, more than one architecture can satisfy the requirements, Berton Manning for the Department of Defense (DoD). Physical architecture gives enough detail to implement the architecture on a technology. This description of separate workflows triggered by events is a logical view, not a physical one. Option 7 (Intra PHY split): Multiple realizations of this option are possible, including asymmetrical options which allow obtaining benefits of different sub-options for UL and DL independently. Fs-C and Fs-U provide control plane and user plane connectivity over Fs interface. The idea of decomposing a system’s speci cation along several ‘levels of abstrac-tion’ constitutes good practice in the eld of software engineering. A central unit (CU) may also be known as BBU/REC/RCC/C-RAN/V-RAN. model of a engineered system of interest (SoI) system of interest (SoI) is composed of a set of related technical concepts and principles that support the logical operation of the system. It defines how the functions will operate together to perform the system mission(s). Real-time or Non- Real Time. Radio specific functions in the Low-MAC sublayer can for perform scheduling-related information processing and be reporting. view, a behavioral architecture. Option 1 (RRC/PDCP, 1A-like split): In this split option, RRC is in the central unit while PDCP, RLC, MAC, physical layer and RF are kept in the distributed unit. Logical architecture describes how a solution works in terms of function and logical information. In fact it allows architects to model things both at a high and low levels, depending on the requirements, which makes it very important for the architecture process. Functional Decomposition • Functional decomposition is a cornerstone of systems engineering processes. ISO 5 defines logical architecture as: The logical architecture of a system is composed of a set of related technical concepts and principles that support the logical operation of the system. Option 7-2 In this option the UL, FFT, CP removal, resource de-mapping and possibly pre-filtering functions reside in the DU, the rest of PHY functions reside in the CU. In the downlink, iFFT and CP addition reside in the DU and the rest of the PHY resides in the CU. Considering above there are three sub-variant available for this option described as below. Option 3-2 Split based on TX RLC and RX RLC. This technique turned out Remaining functions reside in the CU. The primary difference between logical and physical architecture documentation is that, while logical architecture's concerns end with identifying functional elements of the system, physical architecture takes an additional step, specifying actual devices that those functional elements execute on. High-MAC and Low-MAC), the services and functions provided by the MAC layer will be located in the Central Unit (CU), in the Distributed Unit (DU), or in both. logical architecture. As a part of study item for New Radio (NR), 3GPP started studying different functional splits between central and distributed units. These functions can be used as a reference by different domain experts to develop IT-systems as part of a co-operative information-driven enterprise. In addition, this option can be achieved by separating the RRC and PDCP for the CP stack and the PDCP for the UP stack into different central entities. Functional architecture is described as “an architectural model that identifies system function and their interactions. Its operation is controlled by the CU. A Functional Architecture is an architectural model that identifies system function and their interactions. Fs-C and Fs-U provide control plane and user plane connectivity over Fs interface.

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