Dynamic channel assignment for TCP/IP data transmitted via cable television channels by managing the channels as a single sub network

• US 5,675,732 A
• Filed: 05/08/1995
• Issued: 10/07/1997
• Est. Priority Date: 05/08/1995
• Status: Expired due to Term

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Majeti, Venkata Chalapathi, Rochkind, Mark Meir
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): Chen, Duo
• Application Number:
  US08/435,048
• Time in Patent Office: 883 Days
• Field of Search: 370/60.1, 370/94.1, 370/85.13, 370/18, 370/95.3, 370/85.7, 370/118, 370/53, 340/825.03, 358/133, 358/136, 375/38, 348/12, 348/384, 395/200.01
• US Class Current: 709/235
• CPC Class Codes: H04N 21/2385 Channel allocation H04N21/266 takes precedence; Bandwidth allocation H04N21/24 takes precedence ; allocation of channels according to the instantaneous demands of the users in time-division multiplex systems H04J3/1682; admission control, resource allocation in open networks H04L12/5692; arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896; negotiating bandwidth in wireless networks H04W28/16
• CPC Class Codes: H04N 21/2393 involving handling client requests scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/42684 Client identification by a unique number or address, e.g. serial number, MAC address, socket ID network arrangements, protocols or services for addressing or naming H04L61/00
• CPC Class Codes: H04N 21/6405 Multicasting data broadcast and multicast in packet switching networks H04L12/18
• CPC Class Codes: H04N 21/64322 IP
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58
• CPC Class Codes: H04N 7/17336 Handling of requests in head-ends

Abstract

A system which avoids the bandwidth inefficiencies of simply providing multiple separate and independent channels for distributing data services over television compatible networks by considering the multiple channels as one unit and managing them as one unit with an upstream bandwidth management unit. This bandwidth management unit dynamically assigns active users to unused bandwidth among multiple channels. To accomplish this, the bandwidth management unit records each request for channel bandwidth that is made, each request that is being actively fulfilled, and each request that has been completed. Thus, data service providers, such as multimedia services, can efficiently use multiple 6 megahertz television network compatible channels to distribute their data to many requesters/users at high rates of speed over a relatively inexpensive existing network.

Claims

1. An apparatus for delivering data services from a plurality of data service providers to a plurality of single user data units, comprising:

a network for communicating data packets according to TCP/IP protocol;

a local network unit connected to said network by a plurality of NTSC compatible channels and having a plurality of channels for multiplexing data packets from said network upon said plurality of NTSC compatible channels;

said local network unit manages said plurality of channels as a single sub network instead of managing each channel individually;

a plurality of single user data units connected to said local network unit via one of said plurality of channels for receiving data packets, each of said single user data units having a unique internet address assigned thereto;

a plurality of data service provider units, each of said data service provider units is connected to said network for transmitting data packets according to TCP/IP protocol to said single user data units via said local network unit and said plurality of NTSC compatible channels;

each of said data service provider units is respectively connected by an individual channel to each single user data unit to which the respective data service provider transmits said data packets, each of said individual channels for controlling said transmission of data packets to a respective single user data unit; and

a bandwidth manager connected to said plurality of data service provider units and said local network unit via said network, said bandwidth manager keeps a dynamic record of an amount of bandwidth used of each of said plurality of channels and assigns any new bandwidth allocation for data services to the NTSC compatible channel which has a largest amount of bandwidth available to fulfill the new bandwidth allocation for data services.

2. The apparatus of claim 1, wherein said dynamic record is incremented for each amount of bandwidth that is allocated from a channel at the time of a request to deliver data, and decremented for each amount of bandwidth of a channel that is freed up after all data packets related to the request have been delivered to the respective single user data unit.

3. The apparatus of claim 2, wherein said local network unit maintains a routing table that specifies the single user data unit address and a channel modulator of the allocated channel to provide data packet routing.

4. The apparatus of claim 1, wherein said local network unit maintains a routing table that specifies the single user data unit address and a channel modulator of the allocated channel to provide data packet routing.

5. The apparatus of claim 4, wherein each of said channel modulators and the single user data units connected thereto are managed by said local network unit.

6. The apparatus of claim 1, wherein said NTSC compatible channels are six megahertz wide, which is the bandwidth of standard broadcast television channel and hence the standard cable television channel.

7. The apparatus of claim 1, wherein said TCP/IP data packets are modulated onto said NTSC channels using a type of modulation that is compatible with a network of cable television cables and cable television distribution amplifiers.

8. The apparatus of claim 1, wherein said NTSC compatible channels are contiguous frequency channels of a CATV network.

9. The apparatus of claim 1, wherein said local network unit receives and converts the data packets addressed to its plurality of single user units from the NTSC compatible signals into IEEE 802.2 protocol data packets and routes each stream of data packets to its respective single user unit over a respective connection therebetween.

10. The apparatus of claim 9, wherein said connection is a local area network, LAN, that communicates according to IEEE 802.2 protocol.

11. The apparatus of claim 1, wherein one of said data service provider units transmits data in said data packets which are encrypted.

12. The apparatus of claim 11, wherein key sequences for encryption are delivered to each of the data service providers transmitting encrypted data via a respective individual channel of said individual channels.

13. The apparatus of claim 12, wherein each said data service provider unit providing encrypted data uses a user provided key to encrypt the data within the data packets before that data leaves the data service provider unit and is propagated over said TCP/IP network.