Method and node entity for enhancing content delivery network
First Claim
1. A method for ensuring at least a predetermined number of copies of a content object to be kept stored in a network comprising a plurality of cache nodes for storing copies of content objects, the method comprising:
- assigning each of a plurality of copies of content objects a value of a ranking state, wherein the value of the ranking state indicates whether the copy is deletable or non-deletable, and wherein at least one copy of each content object is assigned with the value non-deletable;
changing the ranking state value for at least one copy of at least one content object from non-deletable to deletable in a cache node, said at least one copy being eligible for the value deletable only if a deletable copy of said at least one content object in another cache node is eligible for the value non-deletable.
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Abstract
The present invention prdvides a method and a caching node entity for ensuring at least a predetermined number of a content object to be kept stored in a network, comprising a plurality of cache nodes for storing copies of content objects. The present invention makes use of ranking states values, deletable or non-deletable, which when assigned to copies of content objects are indicating whether a copy is either deletable or non-deletable. At least one copy of each content object is assigned the value non-deletable The value for a copy of a content object changing from deletable to non-deletable in one cache node of the network, said copy being a candidate for the value non-deletable, if a certain condition is fulfilled.
91 Citations
12 Claims
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1. A method for ensuring at least a predetermined number of copies of a content object to be kept stored in a network comprising a plurality of cache nodes for storing copies of content objects, the method comprising:
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assigning each of a plurality of copies of content objects a value of a ranking state, wherein the value of the ranking state indicates whether the copy is deletable or non-deletable, and wherein at least one copy of each content object is assigned with the value non-deletable; changing the ranking state value for at least one copy of at least one content object from non-deletable to deletable in a cache node, said at least one copy being eligible for the value deletable only if a deletable copy of said at least one content object in another cache node is eligible for the value non-deletable. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A caching node entity for ensuring at least a predetermined number of copies of a content object to be kept stored in a network comprising a plurality of cache nodes for storing copies of content objects, the entity comprising:
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assigning means adapted to assign each of a plurality of copies of content objects a value of a ranking state, wherein the value of the ranking state indicates whether the copy is deletable or non-deletable, and wherein at least one copy of each content object is assigned with the value non-deletable; and changing means configured to change the ranking state value for at least one copy of at least one content object from non-deletable to deletable in a cache node, said at least one copy being eligible for the value deletable only if a deletable copy of said at least one content object in another cache node is eligible for the value non-deletable. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification