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1. IN1095/DELNP/2005 - SYSTEM AND WIRELESS INSTANT MESSAGING

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[ EN ]
1. An instant messaging system, comprising:- a plurality of messaging clients (10A, 10B, 10C) capable of transmitting instant messages to one another, wherein each of the plurality of messaging clients (10A, 10B, 10C) is configured to share presence information with one another via a network (90); and means for determining whether each messaging client (10A, 10B, 10C) is in a state in which it is receptive to receiving presence information from the other messaging clients (10A, 10B, 10C), and if so, then for transmitting presence information for each of the other messaging clients (10A, 10B, 10C) via the network (90) optionally through a wireless instant messaging server (200) which receives and stores presence information in a data store for each of the plurality of messaging clients (10A, 10B, 10C);the wireless instant messaging server (200) processes the presence information in the data store to determine whether or not to propagate presence information for the plurality of messaging clients (10A, 10B, 10C) to each of the individual messaging clients (10A, 10B, 10C) represented by the presence information in the data store. 2. The system as claimed in claim 1, wherein a timeout interval (Tca, TCb) for each ofthe messaging clients (10A, 10B, 10C) is set to a predetermined value that, whenexpired, will put the messaging client (10A, 10B, 10C) into an unknown state inwhich it is not receptive to receiving presence information from each of the othermessaging clients. (10A, 10B, 10C) 3. The system as claimed in claim 1, wherein the messaging clients (10A, 10B, 10C)for detecting a trigger signal (225) indicating that the messaging client (10A, 10B,10C) should be put into an unknown state in which it is not receptive to receivingpresence information from each of the other messaging clients (10A, 10B, 10C). 4. The system as claimed in claim 1, wherein the messaging clients (10A, 10B, 10C)for transmitting presence information directly from each of the plurality of messaging clients (10A, 10B, 10C) to the other messaging clients (10A, 10B, 10C) without using an wireless instant messaging server (200). 5. The system as claimed in claim 1, wherein each of the plurality of messagingclients (10A, 10B, 10C) has a buddy list of other messaging clients (10A, 10B, 10C)with which the messaging client (10A, 10B, 10C) is interested in communicatingwith;and wherein when the messaging client (10A, 10B, 10C) is in a state in which it is receptive to receiving presence information, then obtaining presence information for each of the other messaging clients (10A, 10B, 10C) on the buddy list. 6. The system as claimed in claim 1, wherein the network (90) is a wide areawireless network. 7. The system as claimed in claim 1, wherein the presence information iscommunicated between the plurality of messaging clients (10A, 10B, 10C) via awireless instant messaging server (200) coupled to the network (90). 8. The system as claimed in claim 1, wherein the wireless instant messaging server(200) maintains a presence information database storing current presenceinformation for each of the plurality of messaging clients (10A, 10B, 10C). 9. The system as claimed in claim 8, wherein said wireless instant messaging server(200) transmits presence information to each of the plurality of messaging clients(10A, 10B, 10C) unless the presence information database indicates that a particularmessaging client (10A, 10B, 10C) is in a state indicating that it is not receptive toreceiving presence information. 10. The system as claimed in claim 1, wherein the presence information transmitted to the messaging client (10A, 10B, 10C) is associated with other messaging clients (10A, 10B, 10C) whose state is known.