Method and system for managing bandwidth

1. A method of managing bandwidth in a content delivery system, the method comprising:

identifying two or more content items which are associated with at least some common content and which are temporally related;

determining a relative priority of at least some of the identified content items; and

allowing a receiver requesting the content associated with a lower priority content item to access a multicast associated with a higher priority content item,

wherein allowing a receiver requesting the content associated with a lower priority content item to access a multicast associated with a higher priority content item comprises mapping a virtual channel associated with the higher priority content item and a virtual channel associated with the lower priority content item to a common transmission channel during a time when the two or more content items are associated with at least some common content.

2. The method of claim 1 , wherein identifying two or more content items which are associated with at least some common content and which are temporally related comprises:

identifying two or more broadcast streams in which at least some common content is scheduled for broadcast at a common start time.

3. The method of claim 2 , wherein the content items comprise programming data for a plurality of broadcast streams and identifying two or more broadcast streams in which at least some common content is scheduled for broadcast at a common time comprises parsing the programming data.

4. The method of claim 2 , wherein determining a relative priority of at least some of the identified content items comprises:

determining the relative priority of at least some of the identified content items with reference to prioritization data, the prioritization data specifying relative priorities of two or more broadcast streams.

5. The method of claim 4 , wherein the prioritization data is signal substitution data which specifies that content items associated with one or more domestic broadcast streams are to be prioritized higher than content items associated with one or more foreign broadcast streams.

6. The method of claim 2 , wherein allowing a receiver requesting the content associated with a lower priority content item to access a multicast associated with a higher priority content item comprises:

receiving, from a receiver during the time when the two or more broadcast streams associated with common content are being broadcast, a request to provide content associated with the lower priority content item to the receiver and, in response, providing the content associated with the higher priority content item to the receiver.

7. The method of claim 6 , wherein providing the content associated with the higher priority content item to the receiver comprises:

instructing the receiver to tune into a frequency associated with a transmission channel used for transmitting the content associated with the higher priority content item.

8. The method of claim 2 , wherein determining a relative priority of at least some of the content items comprises:

determining a signal quality of the content associated with the identified content items; and

determining a relative priority of at least some of the content items based on the signal quality of the content associated with the content items.

9. A bandwidth management system comprising:

at least one processor;

a memory coupled to the at least one processor, the memory having stored thereon processor executable instructions which, when executed by the processor cause the processor to:

identify two or more content items which are associated with at least some common content and which are temporally related;

determine a relative priority of at least some of the identified content items; and

allow a receiver requesting the content associated with a lower priority content item to access a multicast associated with a higher priority content item,

wherein allowing a receiver requesting the content associated with a lower priority content item to access a multicast associated with a higher priority content item comprises mapping a virtual channel associated with the higher priority content item and a virtual channel associated with the lower priority content item to a common transmission channel during a time when the two or more content items are associated with at least some common content.

10. The bandwidth management system of claim 9 , wherein identifying two or more content items which are associated with at least some common content and which are temporally related comprises:

identifying two or more broadcast streams in which at least some common content is scheduled for broadcast at a common start time.

11. The bandwidth management system of claim 9 , wherein the content items comprise programming data for a plurality of broadcast streams and identifying two or more broadcast streams in which at least some common content is scheduled for broadcast at a common time comprises parsing the programming data.

12. The bandwidth management system of claim 9 , wherein determining a relative priority of at least some of the identified content items comprises:

determining the relative priority of at least some of the identified content items with reference to prioritization data, the prioritization data specifying relative priorities of two or more broadcast streams.

13. The bandwidth management system of claim 12 , wherein the prioritization data is signal substitution data which specifies that content items associated with one or more domestic broadcast streams are to be prioritized higher than content items associated with one or more foreign broadcast streams.

14. The bandwidth management system of claim 9 , wherein allowing a receiver requesting the content associated with a lower priority content item to access a multicast associated with a higher priority content item comprises:

receiving, from a receiver during the time when the two or more broadcast streams associated with common content are being broadcast, a request to provide content associated with the lower priority content item to the receiver and, in response, providing the content associated with the higher priority content item to the receiver.

15. The bandwidth management system of claim 14 , wherein providing the content associated with the higher priority content item to the receiver comprises:

instructing the receiver to tune into a frequency associated with a transmission channel used for transmitting the content associated with the higher priority content item.

16. The bandwidth management system of claim 9 , wherein determining a relative priority of at least some of the content items comprises:

determining a signal quality of the content associated with the identified content items; and

determining a relative priority of at least some of the content items based on the signal quality of the content associated with the content items.