ISO/IEC 5021-1:2023

Overview

ISO/IEC 5021-1:2023 - Telecommunications and information exchange between systems - Wireless LAN access control - Part 1: Networking architecture specifies a cloud AC (access controller) based WLAN networking architecture for public WLAN scenarios. The standard defines the cloud access controller dispatch platform (CADP) operating mechanism, the interactions between network elements (CADPs, APs, cloud ACs and the WLAN NMS), and the main functional requirements for each element. It also references CAPWAP and IEEE 802.11 for radio/MAC specifications.

Keywords: ISO/IEC 5021-1:2023, Wireless LAN access control, cloud AC, CADP, WLAN NMS, CAPWAP, public WLAN, networking architecture

Key topics and technical requirements

• Architecture model: Centralized cloud AC pool coordinated by a CADP, with APs deployed at the edge and CADP/WLAN NMS/authentication platforms in the core.
• AP onboarding / first association: APs are pre-configured with a CADP domain/IP; APs resolve CADP, obtain cloud AC IPs and register via CAPWAP.
• Cloud AC selection & load balancing: WLAN NMS selects cloud ACs using weighted load parameters (number of users, number of APs, traffic throughput, CPU usage, network latency); associations are pushed to CADP and cloud ACs.
• Switchover procedures: Defined flows for planned optimization/replacement and for active/standby failover where CADP updates AP-cloud AC mappings and APs re-associate.
• Redundancy and backup modes: CADP supports 1+1, N+1, N+M backups and hot backup with active/standby CADP synchronization; active‑active AC backup is supported to move APs to other active cloud ACs.
• Functional requirements: Roles and minimal functions for CADP, cloud AC, AP and WLAN NMS are specified (e.g., association management, synchronization, and command distribution).
• Normative references: ISO/IEC/IEEE 8802-11 (802.11) and IETF RFC 5415 (CAPWAP).

Note: Specific weighting policies and operator-defined load-balancing algorithms are outside the scope and determined by implementers.

Applications and who should use it

• Network architects and system designers planning scalable public WLAN (hotspots, transport hubs, campuses, malls).
• WLAN vendors and cloud service providers implementing cloud AC solutions and CAPWAP-based AP management.
• Operators and integrators deploying resilient, load-balanced WLAN services who need documented procedures for AP onboarding, AC assignment and failover.
• Developers of WLAN NMS solutions that perform dynamic AC selection and monitor AC load metrics.

Practical benefits include simplified AP provisioning, centralized capacity management, improved roaming/load distribution, and defined redundancy strategies for high availability.

Related standards

• ISO/IEC/IEEE 8802-11 (IEEE 802.11) - Wireless LAN MAC/PHY
• IETF RFC 5415 - CAPWAP protocol specification

This standard is a technical foundation for operators and vendors building cloud‑centric, resilient public WLAN services.