本发明描述用于发送及接收广播信息之技术。在一态样中，可产生对于广播信息之广播元数据且广播元数据可包括由终端机使用以过滤该广播信息之位置及时间准则。每一位置及时间准则可包括(i)一由一目标位置及一存在或不存在需求所给定的位置准则及(ii)一由该位置准则应用的一时间周期所给定的时间准则。一终端机可在该广播信息之前或与该广播信息一起接收该广播元数据，自该广播元数据获得位置及时间准则，且基于该位置及时间准则过滤该广播信息。该终端机可借由判定其在一规定时间周期内之位置及判定其位置是在一规定目标位置内还是在该规定目标位置外部(如由该存在或不存在需求所指示)来评估每一位置及时间准则。

Techniques for sending and receiving broadcast information are described. In an aspect, broadcast metadata may be generated for broadcast information and may include location and time criteria used by terminals to filter the broadcast information. Each location and time criterion may include (i) a location criterion given by a target location and a presence or absence requirement and (ii) a time criterion given by a time period in which the location criterion applies. A terminal may receive the broadcast metadata prior to or with the broadcast information, obtain location and time criteria from the broadcast metadata, and filter the broadcast information based on the location and time criteria. The terminal may evaluate each location and time criterion by determining its location within a specified time period and determining whether its location is within or outside a specified target location, as indicated by the presence or absence requirement.