1) Txoj hauj lwm tuaj yeem hloov kho raws li qhov loj ntawm tus sow, scalability, yooj yim thiab yoog raws2) Zoo tiv thaiv cov phev ntws rov qab, txhim kho kev yug me nyuam zoo.3) Peb-lub puab tsaig tsim tau kho lub raj mis thiab lub hnab, siv yooj yim dua thiab ruaj khov.2. Cov yam ntxwv ua haujlwm1) Peb qhov chaw positioningcan yuav tsum tau hloov khoraws li tosows'bodysize2) Lub installation ruaj khov thiab tsis yooj yim poob tawm3) Tuav tus sowb tom qab pab ua kom chiv tauthiab tiv thaiv kev rov qab los