A method for providing assistance data corresponding to a first plurality of access points, APs, comprising: receiving information corresponding to a first plurality of access points, the information comprising a plurality of characteristics about each AP of the first plurality of APs; determining at least one characteristic common to each of the APs of the first plurality of APs based on the plurality of characteristics; generating first group data based on the determined at least one common characteristic of the APs of the first plurality of APs, the first group data comprising the determined at least one common characteristic of the APs of the first plurality of APs, wherein the first group data comprises information corresponding to a common location area for the first plurality of APs or a version, and wherein the first group data further comprises one or more common properties of APs comprising an identification of at least one of an AP manufacturer, an AP model, a chip manufacturer, a chip model and a signaling type; providing the first group data with a first group identifier, ID; storing AP-specific information for a first AP of the plurality of APs, the AP-specific information comprising a characteristic of the first AP and the first group ID; receiving a request for location assistance data from a mobile device, the request comprising information corresponding to the first AP; in response to the request for location assistance data from the mobile device: providing the first group data and the first group ID to the mobile device; and providing the AP-specific information for the first AP to the mobile device. receiving information corresponding to a first plurality of access points, the information comprising a plurality of characteristics about each AP of the first plurality of APs; determining at least one characteristic common to each of the APs of the first plurality of APs based on the plurality of characteristics; generating first group data based on the determined at least one common characteristic of the APs of the first plurality of APs, the first group data comprising the determined at least one common characteristic of the APs of the first plurality of APs, wherein the first group data comprises information corresponding to a common location area for the first plurality of APs or a version, and wherein the first group data further comprises one or more common properties of APs comprising an identification of at least one of an AP manufacturer, an AP model, a chip manufacturer, a chip model and a signaling type; providing the first group data with a first group identifier, ID; storing AP-specific information for a first AP of the plurality of APs, the AP-specific information comprising a characteristic of the first AP and the first group ID; receiving a request for location assistance data from a mobile device, the request comprising information corresponding to the first AP; in response to the request for location assistance data from the mobile device: providing the first group data and the first group ID to the mobile device; and providing the AP-specific information for the first AP to the mobile device. providing the first group data and the first group ID to the mobile device; and providing the AP-specific information for the first AP to the mobile device.