Cache device, cache control device, and methods for detecting handover

摘要

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.

主权项

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 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, 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 configured
to extract content requested by the user terminal from the storage unit, andto 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, andto provide, to the user terminal, data for a portion after the content interruption point among the content corresponding to the content identification information.