CONTENT DISTRIBUTION SYSTEM AND ITS CONTROL METHOD
First Claim
1. A content distribution system comprising a content distribution server which performs distribution of content data and a movable client terminal which receives the content data distributed from the content distribution server after establishing a communication connection with the content distribution server,the client terminal including:
- a first transmission unit which repeatedly transmits a keep-alive signal, indicating that the communication connection is effective during distribution of the content data, to the content distribution server;
a detection unit which detects presence of an incommunicable area in a moving direction of the client terminal; and
a second transmission unit which transmits a change request signal, requesting an increase of a confirmation interval of the keep-alive signal, to the content distribution server before the client terminal enters the incommunicable area,the content distribution server including;
a reception unit which receives a signal transmitted from the client terminal, the signal including the keep-alive signal and the change request signal, during distribution of the content data;
a distribution control unit which terminates a session of the content data distribution when a next keep-alive signal is not received within the confirmation interval from a time at which a previous keep-alive signal is received; and
a setting unit which increases the confirmation interval when the change request signal is received, thereby allowing the session to be maintained while the client terminal is in motion within the incommunicable area.
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Accused Products
Abstract
A content distribution system in which, when it is detected that an incommunicable area is present in a moving direction of a client terminal, the client terminal transmits a change request signal, requesting an increase of the confirmation interval of a keep-alive signal, to the content distribution server before the client terminal enters the incommunicable area. When the change request signal is received during distribution of content data, the content distribution server increases the confirmation interval of the keep-alive signal, thereby allowing the session of content distribution to be maintained while the client terminal is in motion within the incommunicable area.
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Citations
7 Claims
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1. A content distribution system comprising a content distribution server which performs distribution of content data and a movable client terminal which receives the content data distributed from the content distribution server after establishing a communication connection with the content distribution server,
the client terminal including: -
a first transmission unit which repeatedly transmits a keep-alive signal, indicating that the communication connection is effective during distribution of the content data, to the content distribution server; a detection unit which detects presence of an incommunicable area in a moving direction of the client terminal; and a second transmission unit which transmits a change request signal, requesting an increase of a confirmation interval of the keep-alive signal, to the content distribution server before the client terminal enters the incommunicable area, the content distribution server including; a reception unit which receives a signal transmitted from the client terminal, the signal including the keep-alive signal and the change request signal, during distribution of the content data; a distribution control unit which terminates a session of the content data distribution when a next keep-alive signal is not received within the confirmation interval from a time at which a previous keep-alive signal is received; and a setting unit which increases the confirmation interval when the change request signal is received, thereby allowing the session to be maintained while the client terminal is in motion within the incommunicable area. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a content distribution system including a content distribution server which performs distribution of content data and a movable client terminal which receives content data distributed from the content distribution server after establishing a communication connection with the content distribution server, comprising the steps of:
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in the movable client terminal, repeatedly transmitting a keep-alive signal, indicating that the communication connection is effective during distribution of the content data, to the content distribution server; detecting presence of an incommunicable area in a moving direction of the client terminal; and transmitting a change request signal, requesting an increase of a confirmation interval of the keep-alive signal, to the content distribution server before the client terminal enters the incommunicable area, and further comprising the steps of; in the content distribution server, receiving a signal transmitted from the client terminal, the signal including the keep-alive signal and the change request signal, during distribution of the content data; terminating a session of distribution of the content data when a next keep-alive signal is not received within the confirmation interval from a time at which a previous keep-alive signal is received; and increasing the confirmation interval when the change request signal is received, thereby allowing the session to be maintained while the client terminal is in motion within the incommunicable area.
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Specification