its智慧型運輸系統(tǒng)(參考版)
2025-01-03 00:47本頁面
【正文】 t change their own point of attachment – Current address recorded at the HA (dedicated server) – Handled by NEMO WG ? NEMO Basic Support: RFC 3963 () Benefit of work mobility support over host mobility support ? The vehicle changes its point of attachment to the Inter – Host Mobility: each node maintains Inter access ? Each host must perform Mobile IPv6 ? Network Mobility: only the mobile router (MR) maintains Inter access – Standards IPv6 nodes can be located behind the MR: no mobility support CALM Architecture and SAPs of Network Service Access Points ? SAPs – Service Access Points – Between the air interface and the working protocols – Between the air interface and the CALM management protocols ? SAPs provide a mon basis for transaction … – between the air interface and the work layer. – between the work layer and the upper application layers. Data SAPs ? The different CALM media all use the same CALM work layer. ? All media also use the same type of SAP to municate between the CALM work layer and the munications adaptation layer. ? Two service primitives – request and indication Management SAPs ? These SAPs handle the overall management of the transaction: start, reset, join, authenticate, reauthenticate, deauthenticate, scan (for media), associate, deassociate, reassociate, etc. ? CALMaware applications use MSAPs to municate with other management entity. CALM Management Entity ? CALM/Application Management Entity (CME) – Select the best munication media for application ? Network Management Entity (NME) – Signal the Network status to CME – Achieve interwork (intermedia) handover – Use IP(v6) layer to control mobility ? Interface Management Entity (IME) – Signal the media status to NME – Avoid interferences among munication media – Achieve intrawork (intramedia) handover CALM policies ? Media – interface protocol提供 給 interface status list ? Requirement – application protocol提供 給 application requirement list ? Policy – Media selection policy CALM/Application Manager ? Its principal role is to manage the overall functioning of CALM, but it also has to provide the session management with the application. ? To manage the session it has to direct messages/data/requests to/from the application to the appropriate destination in the vehicle. ? CME needs Policies to decide munication links and they can be – Userdefined、 Manufacturerdefined、 Local authoritiesdefined CALM/Application manager entity Network Manager ? It provides the link between one or more media and one or more service an
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