在數位家庭的概念進入生活之後，有越來越多數位化家用裝置，數位化的服務也越來越多。透過網路，使用者可以隨時向服務供應商下載安裝或更新服務。OSGi閘道器提供一個裝置數位化服務的公開平台，然而OSGi家用閘道器上的硬體資源有限，服務卻可能不斷的增加，因此將會有資源不足的情形發生，而產生例外錯誤。這種狀況，對於一般使用者帶來困擾且不好解決，而且有違人們把數位家庭帶進生活中，是為了改善生活，讓生活更為便利的原意。

本研究設計了一個在OSGi家用閘道器上的服務部署管理程式，在部署服務前針對可以事先預防的狀況，對記憶體、硬碟、CPU、家用裝置、服務的相依性做部署管理。若資源不足時，則會針對各個不同的資源不足情況，啟動不同的管理機制，例如記憶體不足時會將最小相依性的服務反安裝，以釋放出更多的記憶體來讓新的服務安裝；CPU負載達臨界值，會出現警示資訊，以避免因為CPU負載達到臨界值，讓整體處理量會同時減少；當安裝服務時缺少引用的物件，會回傳訊息到服務供應商，並搜尋是否有提供相關物件的服務下載，避免因為缺少引用的物件而發生例外。本研究中，在部署前必須檢查資源是否足夠讓服務安裝並啟動對系統有較大的負荷，在1.66GHz的PC，作業系統為Linux，VM-ware的環境，在Knopflerfish平台上執行，約需花費1秒；而若偵測到硬碟不足，到解決空間不足的問題並下載安裝服務，約需5秒；在偵測到安裝的服務缺少引用的物件，到安裝提供需要物件的服務並將原本服務安裝並啟動，則需要花費10秒左右。

As the smart home concept gets into our life, there are more and more home appliances and the number of services based on the appliances will increase accordingly. OSGi is an open platform for installing smart home services. Users can download or update services from service providers at any time, but the hardware resources are limited in OSGi home gateways. Hence, resources may be insufficient in an OSGi home gateway. This would introduce exceptions, which would bring inconveniences to users.
This paper proposes a service deployment mechanism for the OSGi home gateway. The mechanism is to solve the insufficient-resource problem by monitoring memory usage, disk usage, CPU loading, available home appliances, and service dependency. For instance, if free memory and free disk space are not enough to install a new Bundle, the home gateway will find the service of least dependency and uninstall it to release the resources. To avoid CPU usage exceeding the threshold, the home gateway will return a warning. If the home appliance invoke a service which does not exist, the home gateway will return the information to the service provider and search the database about information of the home appliance. If the installed bundle can not find the imported packages, the home gateway will return the information to the service provider and download the bundle which supports these packages.
Performance measures show that the checking process takes about 1 second, if everything is fine. For the resource insufficient cases, it takes from 5 seconds to 10 seconds, under a 1.66GHz PC running knopflerfish OSGi on Linux under VM-ware.

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