ANNOUNCING INFORMATION SERVICE THROUGH BROADCASTING OR MULTICASTING
First Claim
1. A method of operating broadcast or multicast apparatus, the method comprising:
- controlling the apparatus to broadcast or multicast, in respect of one or more announcements on a lower level and relating to a category of an information service, data indicating a category to which the announcements relate, and data indicating the quantity of announcement information transmitted in respect of the lower level.
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Accused Products
Abstract
A receiver (FIG. 2) receives IP session announcement signals from a terrestrial digital video broadcasting system. Each IP session announcement (RM) includes information concerning announcements on an immediately lower level as well as information identifying the quantity of announcement data, such as the number of announcement messages, and a timeout value. The quantity data tells the receiver how many messages XI to X3 it needs to receive (C) before it has received all the relevant announcement messages. The timeout value informs the receiver how long it can wait before again receiving the messages X1 to X3 (which may have changed in content by then). After initially receiving the messages X1 to X3, the receiver may sleep (E), or it may receive announcement messages from another channel Y (D).
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Citations
1 Claim
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1. A method of operating broadcast or multicast apparatus, the method comprising:
controlling the apparatus to broadcast or multicast, in respect of one or more announcements on a lower level and relating to a category of an information service, data indicating a category to which the announcements relate, and data indicating the quantity of announcement information transmitted in respect of the lower level.
Specification