Abstract: Wireless communication systems wherein services involving two or more stations in the system may be activated automatically. Data is communicated between airborne stations according to a TDMA protocol, where the data is transmitted in time slots organized in frames of a repeating frame structure. A link address is associated with at least one time slot. The stations select link addresses for transmission of data according to a self-organizing transmission algorithm. Each station broadcasts data messages of a first type at a first repetition rate and receives such corresponding messages from the other stations. At least based on the received data messages of the first type, each station determines whether a service activation criterion is fulfilled with respect to at least one other station. If the service activation criterion is fulfilled, the station starts to transmit data messages of a second type, which pertain to a service that involves the station itself and the at least one other station.

Abstract: Participants of a conference call dial in to or are invited to participate in a conference by a central conference calling center. Participant identification information is transmitted from the conference calling center to each of the participants. The participant identification information includes an unique identifier and an address associated with each of the participants of the conference call. Audio signals received at an electronic device are interrogated to identify the participant that originated the audio signals (the active participant). The audio signals and/or a graphical representation of the active participant is output in a predetermined manner based on the identification of the active participant that originated the audio signals.

Abstract: A method of transmitting voice data in a communication network and a device for transmitting such voice data, as well as a method of receiving voice data in a communication network and a device for receiving such data are provided. The voice data is comprised in a data packet transmitted by the transmitting device to the receiving device.

Abstract: The invention relates to wireless communication systems wherein services involving two or more stations in the system may be activated automatically. Data is communicated between airborne stations (A, B) according to a TDMA protocol, where the data is transmitted in time slots organized in frames of a repeating frame structure. A link address is associated with at least one time slot, and the stations select link addresses for transmission of data according to a self-organizing transmission algorithm. Each station (A, B) broadcasts data messages of a first type (D1) at a first repetition rate and receives such corresponding messages from the other stations (A, B). At least based on the received data messages of the first type (D1), each station determines whether a service activation criterion is fulfilled with respect to at least one other station (A, B), for example by the other station being located within a limit distance (rA).