Fixed length filtering to filter clusters of discrete segments of data

• US 7,487,254 B2
• Filed: 12/20/2001
• Issued: 02/03/2009
• Est. Priority Date: 12/20/2001
• Status: Expired due to Fees

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Luoma, Juha-Pekka, Walsh, Rod, Hakkarainen, Tomi
• Primary Examiner(s): Zeender; F.
• Assistant Examiner(s): Refai; Ramsey
• Application Number:
  US10/027,048
• Publication Number:
  US 20030135636A1
• Time in Patent Office: 2,602 Days
• Field of Search: 709/245, 709/235, 709/232, 370/389
• US Class Current: 709/238
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• CPC Class Codes: H04N 21/6371 directed to network
• CPC Class Codes: H04N 21/6433 Digital Storage Media - Command and Control Protocol [DSM-CC]
• CPC Class Codes: H04N 21/64784 Data processing by the network data processing in packet switching systems H04L12/56; flow control in packet networks H04L47/10; intermediate storage or scheduling H04L49/90; provisioning of proxy services in data packet switching networks H04L67/56

Abstract

Methods and systems are provided for filtering digital data formatted in packets. A filter module contains a plurality of filters and is coupled to a filter mapping module. The filter mapping module receives the identification of clusters of discrete segments of a packet and selects a group of fixed length filters to filter the clusters.

Claims

1. An apparatus comprising:

a processor configured to execute control logic to perform operations that include

receiving, from a client system processing clusters of data found in digital packets, an identification of at least two clusters of discrete segments of data within at least one of said digital packets, wherein a first one of the at least two clusters of data is formatted in accordance with a first protocol and a second one of the at least two clusters of data is formatted in accordance with a second protocol different than the first protocol, and wherein receiving an identification of at least two clusters includes receiving an identification of a protocol of the data and a value; and

processing the identification to select at least two fixed length filters from a plurality of fixed length filters to filter the at least two clusters, wherein each of the selected at least two fixed length filters has an offset value corresponding to a beginning of one of the at least two clusters.

2. The apparatus of claim 1, wherein the plurality of fixed length filters have a common length.

3. The apparatus of claim 2, wherein each of the plurality of fixed length filters is 2 bytes.

4. The apparatus of claim 1, wherein the plurality of fixed length filters is configured so that each of the plurality of fixed length filters has an offset value corresponding to one of the discrete segments of the at least one digital packet.

5. The apparatus of claim 4, wherein at least one of the plurality of fixed length filters has the offset value of 0.

6. The apparatus of claim 1, further including a filter processor comprising the plurality of fixed length filters.

7. The apparatus of claim 6, wherein the filter processor is configured to execute control logic to perform:

receiving the at least two clusters of the discrete segments of data; and

filtering the at least two clusters of the discrete segments of data with the selected at least two of a plurality of fixed length filters.

8. The apparatus of claim 1, wherein the protocol comprises DVB-T and the value comprises an IP address.

9. The apparatus of claim 1, wherein the processor is configured to execute further control logic to perform:

mapping the identification of the protocol of the data and the value to the at least two clusters of the discrete segments of data.

10. The apparatus of claim 1, wherein the client system is a DVB receiver.

11. The apparatus of claim 1, wherein the client system is a mobile terminal.

12. A method comprising:

receiving, from a client system processing clusters of data found in digital packets, an identification of at least two clusters of discrete segments of data within at least one of said digital packets, wherein a first one of the at least two clusters of data is formatted in accordance with a first protocol and a second one of the at least two clusters of data is formatted in accordance with a second protocol different than the first protocol, and wherein receiving an identification of at least two clusters includes receiving an identification of a protocol of the data and a value; and

processing the identification to select at least two of a plurality of fixed length filters to filter the at least two clusters.

13. The method of claim 12, further comprising:

generating a filter mask that identifies segments of the selected at least two of a plurality of fixed length filters.

14. The method of claim 13, further comprising:

providing filter values.

15. The method of claim 13, further comprising:

generating at least one rule for combining data filtered by the at least two of a plurality of fixed length filters.

16. The method of claim 12, further comprising:

selecting offset values for the at least two of the plurality of fixed length filters.

17. The method of claim 12, wherein the client system is a DVB receiver.

18. The method of claim 12, wherein the client system is a mobile terminal.

19. A computer-readable medium containing computer-executable instructions, that when executed by a processor, cause the processor to perform a method comprising:

receiving, from a client system processing clusters of data found in digital packets, an identification of at least two clusters of discrete segments of data within at least one of said digital packets, wherein a first one of the at least two clusters of data is formatted in accordance with a first protocol and a second one of the at least two clusters of data is formatted in accordance with a second protocol different than the first protocol, and wherein receiving an identification of at least two clusters includes receiving an identification of a protocol of the data and a value; and

processing the identification to select at least two of a plurality of fixed length filters to filter the at least two clusters.

20. The computer-readable medium of claim 19, further including computer-executable instructions, that when executed by a processor, cause the processor to perform:

generating a filter mask that identifies segments of the selected at least two of a plurality of fixed length filters.

21. The computer-readable medium of claim 20, further including computer-executable instructions, that when executed by a processor, cause the processor to perform:

providing filter values.

22. The computer-readable of claim 20, further including computer-executable instructions, that when executed by a processor, cause the processor to perform:

generating at least one rule for combining data filtered by the at least two of a plurality of fixed length filters.

23. The computer-readable of claim 19, further including computer-executable instructions, that when executed by a processor, cause the processor to perform:

selecting offset values for the selected at least two of the plurality of fixed length filters.

24. The computer-readable medium of claim 19, wherein the client system is a DVB receiver.

25. The computer-readable medium of claim 19, wherein the client system is a mobile terminal.

26. A method comprising:

receiving, from a client system processing clusters of data found in digital packets, identification of a first cluster of discrete data in a first segment of a digital packet and a second cluster of discrete data in a second segment of the digital packet, wherein the first cluster of discrete data is formatted in accordance with a first protocol and the second cluster of discrete data is formatted in accordance with a second protocol different than the first protocol, and wherein receiving an identification of the first and second clusters includes receiving an identification of a protocol of the data and a value;

processing the identification of the first cluster of discrete data to select a first fixed length filter having an offset value corresponding to the first cluster from a plurality of fixed length filters to filter the first cluster of discrete data;

processing the identification of the second cluster of discrete data to select a second fixed length filter having an offset value corresponding to the second cluster from the plurality of fixed length filters to filter the second cluster of discrete data; and

providing a cluster map including the first and second fixed length filters.

27. The method of claim 26, wherein the cluster map includes the offset value of the first and second fixed length filters.

28. The method of claim 26, wherein none of the plurality of fixed length filters overlap.

29. The method of claim 26, wherein all the plurality of fixed length filters overlap.