Techniques for operating a wireless device configured for operation in a wireless communication network and device-to-device (D2D) communication with one or more other wireless devices distributing and using application codes and discovery filters in D2D wireless devices are disclosed. Distribution and use of an application code is allowed until the associated validity interval expires, requiring a new application code to be obtained. This is solved by the disclosed techniques by simultaneously delivering a plurality of application codes having distinct validity intervals. An example method for an announcing device includes receiving, from a coordinating node, first and second application codes and associated timing information. The associated timing information defines respective first and second validity intervals for the first and second application codes, such that the first and second validity intervals are at least partly non-overlapping. The method further comprises subsequently transmitting, during the first validity interval, one or more discovery messages that include or are based on the first application code, and transmitting, during the second validity interval, one or more discovery messages that include or are based on the second application code. Corresponding techniques for monitoring devices are also disclosed as well as apparatus for use in such techniques. Embodiments facilitate operation of wireless devices in a wireless communication network and D2D communication, enabling discovery of devices to be used for D2D communication and communication therewith.
展开▼
