SSO for SMP 3.0sp7 and NWGW

Hi,

We need to configure sso between SMP 3.0 sp7 and NetWeaver gateway server.our architecture is SMP 3.0--NWGW central hub--Backend system Ecc. Ldap configuration has been done between AD and SMP 3.0 (End user will login in to the mobile device using windows AD user account and it will fetch data from backend system via nwgw. I hope sso between NWGW and ECC can be done by StrustSSO, but single signon between SMP 3.0 and NWGW is new to us,Kindly help me by sharing any document for this.