Method and communication system for providing a context-based communication service

A method for providing a context-based service to a mobile terminal of a user of a communication network, comprising:

• a) at a context server cooperating with said communication network, receiving a query generated from a service application cooperating with said context server for implementing said context-based service, said query indicating that said service application needs to receive from said context server a set of context information when an event associated with a query condition occurs;
• b) at said context server, generating an update rule in response to receiving said query from said service application, said update rule indicating that said mobile terminal, for allowing said context server to serve said query, has to transmit said context information to said context server when an update condition is fulfilled, said update condition being temporally dependent on said query condition, wherein b) further comprises checking whether a further update rule comprising a further update condition and relating to said context information is active and, in the negative, inserting in said update rule, an update condition of an update condition type corresponding to a query condition type;
• c) transmitting said update rule from said context server to said mobile terminal;
• d) receiving said context information from said mobile terminal when said update condition is fulfilled;
• and
• e) at said context server, forwarding said context information to said service application, thereby allowing said service application to implement said context-based service.