Cache device, cache control device, and methods for detecting handover
First Claim
Patent Images
1. A cache device comprising:
- a storage unit comprising a hardware memory configured to store at least one content and terminal access information received from at least one other cache device; and
a controller comprising one or more programmed processors configuredto monitor messages transmitted from at least one user terminal for a content retransmission request message, wherein the content retransmission request message is a request for previously cached content,to extract terminal address information of the user terminal from the content retransmission request message when the content retransmission request message is detected, andif the extracted terminal address information is included in the stored terminal access information, to notify a handover of the user terminal to the at least one other cache device which sends the stored terminal access information,wherein the controller is further configuredto extract content requested by the user terminal from the storage unit, andto provide the extracted content to the user terminal, andwherein, after notifying the handover of the user terminal to the at least one other cache device, the controller is further configuredto receive, from the at least one other cache device, content information including content identification information and information about a content interruption point to the user terminal by the at least one other cache device, andto provide, to the user terminal, data for a portion after the content interruption point among the content corresponding to the content identification information.
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Abstract
For a user terminal connected to one of cache devices distributed in a network and receiving contents, terminal access information including terminal address information about the user terminal and identification information of the cache device is stored and managed. If a content retransmission request message of the user terminal is detected at other cache device, this is regarded as a handover of the user terminal. This allows a simple detection of handover that occurs during content transmission.
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Citations
15 Claims
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1. A cache device comprising:
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a storage unit comprising a hardware memory configured to store at least one content and terminal access information received from at least one other cache device; and a controller comprising one or more programmed processors configured to monitor messages transmitted from at least one user terminal for a content retransmission request message, wherein the content retransmission request message is a request for previously cached content, to extract terminal address information of the user terminal from the content retransmission request message when the content retransmission request message is detected, and if the extracted terminal address information is included in the stored terminal access information, to notify a handover of the user terminal to the at least one other cache device which sends the stored terminal access information, wherein the controller is further configured to extract content requested by the user terminal from the storage unit, and to provide the extracted content to the user terminal, and wherein, after notifying the handover of the user terminal to the at least one other cache device, the controller is further configured to receive, from the at least one other cache device, content information including content identification information and information about a content interruption point to the user terminal by the at least one other cache device, and to provide, to the user terminal, data for a portion after the content interruption point among the content corresponding to the content identification information. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cache control device, comprising:
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a memory unit comprising a hardware memory configured to store, for each of a plurality of cache devices, terminal access information including terminal address information about one or more user terminals receiving content in a communication area of a particular cache device and identification information of the particular cache device, wherein the particular cache device is one of the plurality of cache devices, and the communication area is an area within a network in which the particular cache device resides; and a control unit comprising one or more programmed processors configured to receive terminal access information about a user terminal receiving content from one of the plurality of cache devices, to compare the received terminal access information with the terminal access information stored in the memory unit, and to determine, based on the comparison, whether the user terminal is handed-over to the particular cache device, wherein the control unit is further configured, after determining that the user terminal is handed-over to the particular cache device, to refer to the identification information contained in the terminal access information stored in the memory unit, and then to notify the handover of the user terminal to a previous cache device connected to the user terminal before the handover, and to transmit content transmission information to the particular cache device, wherein the content transmission information includes information about a content interruption point from the previous cache device to the user terminal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification