BS ISO IEC 17821-2015 pdf free download – Information technology — Specification of low power wireless mesh network over channel-hopped TDMA links.
5 General description5.1General
The LPWMN is a low cost communication network that allows reliable, deterministic-latency, and scalablewirelessmeshconnectivity with low-power and low-rate WPANdevices.The main objectives of an LPWMNare optimal utilization of the channel-hopped TDMA links, cluster-tree based mesh network formation,and multiple grade of path selection, while maintaining a simple procedure and a lightweight protocol.Some of the capabilities provided by this standard are as follows:
– resource management of the DSME MAC links beacon
-enabled multi-hop network formation
– unbalanced cluster-tree based address assignment
-directional multiple grades mesh connection
– address based mesh routing
-unicast data forwarding with deterministic-latency- load balanced path maintaining
This standard defines the link network specification for devices that are operated on IEEE Std.802.15.4-2011 PHY capable to support the channel-hopped TDMA links of the DSMEMAC of IEEE Std.802.15.4e-2012.
5.2Components of the LPWMN
The LPWMN consists of a gateway router, routers, and devices,which follow the IEEE Std.802.15.4-2011 and have the DSME MAC sublayer of the IEEE Std.802.15.4e-2012.The gateway router starts anetwork by configuring the attributes of the link network and forming the link network topology, andinterconnects the LPwMN to an external network.The routers join a link network and forward framesthrough the DSME MAC links. The devices are reduced-function device (RFD) or full-function device(FFD) of the IEEE Std.802.15.4-2011 and perform applications.
The LPWMN operates in the star topology and the peer-to-peer topology, as shown in Figure 5.1.A devicetypically establishes a star topology to routers and is either the initiation point or the termination pointfor link network communications. The gateway router is the primary controller of the LPWMN.Thegateway router and routers are capable to establish a peer-to-peer topology.All devices operating ona link network have unique 64bit MAC addresses and i6bit link network addresses.The link networkaddress is allocated by the cluster group.
5.3 Architecture of the LPWMN The reference architecture of the LPWMN is defined in terms of layers, as illustrated in Figure 5.2. The LPWMN provides link control layer interfaces to the next higher layer and link network layer interfaces to the next higher or to the application layer. The LPWMN operates over the IEEE Std 802.15.4e-2012 DSME MAC Sublayer and the IEEE Std 802.15.4-2011 PHY. The LPWMN offers services to the next higher layer. The LPWMN consists of two sublayers: DSME MAC Link Control sublayer (DLC) and DSME MAC Link Network sublayer (DLN). The LPWMN DLC sublayer entity (DLCE) provides services to the next higher layer via the DSME MAC Link Control sublayer Service Access Point (DLC-SAP). The LPWMN DLN sublayer entity (DLNE) provides services to the next higher layer via the DSME MAC Link Network sublayer Service Access Point (DLN-SAP). The DLC sublayer provides link connection control, link management services, data transmission on a link, and relaying frames with supporting of the DSME MAC sublayer via the MCPS-SAP and the MLME-SAP. The DLN sublayer consists of link network formation block, addressing block, routing block, and link network management block, and data processing block which provides receiving function and forwarding function for the frames received from the MAC layer or for the data received from the next higher layer.BS ISO IEC 17821 pdf download.