A digital broadcasting system and a method of processing data are disclosed, which are robust to error when mobile service data are transmitted. To this end, additional encoding is performed for the mobile service data, whereby it is possible to strongly cope with fast channel change while giving robustness to the mobile service data.

Digital broadcasting system and data processing method

A method for exchanging information between providers and users of products and services in which an information management system is established that is computer based and has information processing and storage capabilities. The system also has electronic communication connections that permit buyers and sellers to electronically connect with the information management system for information exchange. Limited electronic access to the information management system is granted to approved sellers of products and services. After approval, each such seller is enabled to access inventory information of that seller for amendment purposes. Similarly, limited electronic access to the information management system is granted to approved buyers of products and services and are provided a searching capability to search a compilation of a plurality of seller's inventory information using criteria specified by that approved buyer. Last, a buyer's listing of products and services is compiled from the compilation of the seller's inventory information for that buyer based on that buyer's search criteria and in which duplicate inventory items are removed therefrom.

Automated and independently accessible inventory information exchange system

A digital broadcasting system and a data processing method are disclosed. The method includes receiving a data processing method includes receiving a broadcast signal in which main service data and mobile service data are multiplexed, acquiring transmission-parameter-channel signaling information including transmission parameter information of the mobile service data, and fast-information-channel signaling information, acquiring binding information describing a relationship between at least one ensemble transferring the mobile service data and a first virtual channel contained in the at least one ensemble by decoding the fast-information-channel, and acquiring status information of the first virtual channel, displaying content data contained in the mobile service data according to the binding information and the status information of the first virtual channel.

Digital broadcasting system and method of processing data in digital broadcasting system

Method and apparatus for secure transmissions. Each user is provided a registration key. A long-time updated broadcast key is encrypted using the registration key and provided periodically to a user. A short-time updated key is encrypted using the broadcast key and provided periodically to a user. Broadcasts are then encrypted using the short-time key, wherein the user decrypts the broadcast message using the short-time key.

Method and apparatus for security in a data processing system

Method and apparatus for data packet transport in a wireless transmission system supporting broadcast transmissions. A multicast tree is built between nodes through neighboring routers. The multicast tree forms a tunnel through which the broadcast content is transmitted. The broadcast message is encapsulated in an Internet Protocol packet for transmission through the multicast tree. At least one multicast tree is formed between the Internet portion of the system and the wireless portion of the system, such as the Access Network. In one embodiment, an external multicast tree is formed between a content source and a packet data service node, and an internal multicast tree is formed between the packet data service node and a packet control function node.

Method and apparatus for data packet transport in a wireless communication system using an internet protocol

In a phase locked loop frequency synthesizer, the frequency of a VCO is switched by changing the division ratio of a variable ratio frequency divider in the feedback path of the loop. At the time of switching, a prepositioning voltage is applied to the VCO to realize fast frequency switching. To correct for nonlinear response of the VCO, the prepositioning voltage is adjusted according to information received from a voltage measuring circuit connected to the VCO control circuit.

Frequency synthesizer having compensation for nonlinearities

An antenna selection diversity receiver system for TDM receive signal switches antennas (1,2) for every assigned time slots so that the best receive signal quality is obtained in said assigned time slot according to the prediction by using the signal quality just before said assigned time slot. The prediction of signal quality is carried out according to the receive level (R₁, R₂), and the slope of the same of each of the antennas just before the assigned time slot. Said signal quality may be average code error rate, receive level at the center of the assigned slot, or the minimum receive level in the assigned slot. The prediction is carried out either through linear prediction or non-linear prediction. Because of prediction of receive signal quality by using the information just before each assigned time slot, and switching of an antenna for every assigned slots according to the prediction, an excellent receive signal quality is obtained by an effect of diversity system even in high rate fading.

An antenna selection diversity reception system

The method of invention provides a multicast service from an information delivery apparatus to wireless terminals through wireless routes. The method includes the step of transmitting, from the information delivery apparatus, a plurality of sets of multicast information, wherein these sets are identical to each other as to contents thereof but differ in transmission conditions. The method further includes the step of receiving, at any given one of the wireless terminals, one of the sets of multicast information being transmitted under one of the differing transmission conditions.

Rendering multicast service with sufficient reception quality to wireless terminals

In the diversity receiver which switches between receiver branches to receive phase modulated signals, this invention can achieve a diversity effect with a circuit of simple construction which by switching between receiver branches based on relative modulation phase error, and can attain diversity effect not only against fading but also against any factor which might affect the transmission lines.

Phase likelihood comparison diversity receiver

A method of allocating radio resources, in a base station, to the base station and a mobile station, comprising the steps of obtaining a ratio between traffic of uplink for transmission from the mobile station to the base station and traffic of downlink for transmission from the base station to the mobile station, and allocating the radio resources to the uplink and the downlink according to the obtained ratio.

Yasushi Yamao

Papers

Frequency synthesizer having compensation for nonlinearities

An antenna selection diversity reception system

Rendering multicast service with sufficient reception quality to wireless terminals

Phase likelihood comparison diversity receiver

Efficient and stable radio resource allocation