Bi-Directional Sync on Android Using SyncAdapter

Please advise,

I am trying to build a Remote Jobs Application for Android using ContentProvider and SyncAdapter and also create a Basic .NET based ServerSide application using SQLExpress, Asp.net web 2.0 and EF,MVC with webpage to do all the admin on the Jobs like Add, Edit, Delete etc..

Here is the Scenario: 1. On the webpage the admin adds the jobs and assign them to several users 2. On the client side (android device) jobs have to be downloaded and stored in sqlite based on the user logged in. 3. The client device has intermittent data connection and for that reason data needs to be synced instead of directly uploading and downloading from the server as the new data.

My Question is? What is the best way to create the database model. So that only data updated on the both sides get synced?I have very basic knowledge about databases, so may be there is a simple solution. Please advise.

Many Thanks