Bandwidth management of virtual networks on a shared network

• US 7,633,925 B2
• Filed: 08/22/2005
• Issued: 12/15/2009
• Est. Priority Date: 03/17/2003
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Iwamura, Ryuichi
• Primary Examiner(s): CHO, HONG SOL
• Application Number:
  US11/209,390
• Publication Number:
  US 20060034330A1
• Time in Patent Office: 1,576 Days
• Field of Search: 370/280, 370/337, 370/345, 370/347, 370442-444, 370/468, 370/498
• US Class Current: 370/345
• CPC Class Codes: H04B 2203/5408 using protocols
• CPC Class Codes: H04B 2203/5441 Wireless systems or telephone
• CPC Class Codes: H04B 2203/5445 Local network
• CPC Class Codes: H04B 2203/545 Audio/video application, e.g. interphone
• CPC Class Codes: H04B 3/542 the information being in digital form
• CPC Class Codes: H04J 3/1682 Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
• CPC Class Codes: H04L 47/15 in relation to multipoint traffic arrangements for broadcast or multicast in data networks H04L12/18
• CPC Class Codes: H04L 47/70 Admission control; Resource allocation
• CPC Class Codes: H04L 47/745 Reaction in network
• CPC Class Codes: H04L 47/762 triggered by the network
• CPC Class Codes: H04L 47/805 QOS or priority aware
• CPC Class Codes: H04L 47/822 Collecting or measuring resource availability data

Abstract

An apparatus and method for equitably allocating bandwidth to virtual networks operating on a common physical network, such as a power-line network for homeowners sharing a single power-line distribution transformer. An ad-hoc master is selected from the virtual power-line network-controllers. The master allocates bandwidth to streams based on their priority group categorization. By way of example, four priority groups (A-D) are described into which stream priority is classified, with the highest priority group for communicating isochronous streams, the lowest priority for transferring asynchronous streams and the other priority groups for communicating streams having an intermediate level of transmission priority. Within a given priority group all bandwidth requests are fulfilled for virtual networks requesting up to their fair share of the bandwidth within the priority group, and bandwidth available from virtual networks not utilizing their full share is allocated equally amongst those requesting more bandwidth.

Claims

1. A method of allocating physical bandwidth among a plurality of virtual networks on the same shared network, comprising:

selecting a master server for allocating physical bandwidth on the shared network in response to a first server detecting that no master server devices are active on the shared network, wherein said first server commences operation as an active master server;

dividing the available physical bandwidth of the shared network, by said active master server device, into assignable time slot or frequency slot units;

ordering streams, being transmitted over the shared network, into priority groups by said active master server device;

assigning time slot or frequency slot units of physical bandwidth to said priority groups in response to the bandwidth requirements of said streams and the transmission priority of said priority group;

assigning specific timeslot or frequency slot units of physical bandwidth to specific streams within each of said priority groups in response to an equitable sharing of physical bandwidth between said virtual networks sharing said shared network; and

reallocating said units of bandwidth if sufficient physical bandwidth on said shared network is not available to simultaneously support bandwidth requirements of said virtual networks.

2. A method as recited in claim 1, further comprising:

assigning an ID to each server device operating on said shared network;

assigning a common key to each virtual network, including a first virtual network;

communicating with any of the devices on a virtual network requires encryption of the common key with the ID for a destination device;

transmitting an AV stream, within a time slot or frequency slot, encoded with said common key over said shared network to other devices within the same virtual network; and

wherein devices within other virtual networks, including a second virtual network, are unable to decrypt communications from within the physical time slots or frequency slots of said first virtual network.

3. A method as recited in claim 1, wherein said priority groups comprise four groups.

4. A method as recited in claim 1, wherein the highest priority group is configured for transmitting isochronous data streams.

5. A method as recited in claim 1, wherein the lowest priority group is configured for transmitting asynchronous data streams.

6. A method as recited in claim 1, wherein said priority groups can be subject to a minimum assignable number of time slots.

7. A method of allocating physical bandwidth among a plurality of virtual networks on the same shared network, comprising:

selecting a master server for allocating physical bandwidth on the shared network in response to a first server detecting that no master server devices are active on the shared network, wherein said first server commences operation as an active master server;

dividing the available physical bandwidth of the shared network, by said active master server device, into assignable time slot or frequency slot units;

categorizing streams for transmission over said shared network into priority groups;

assigning sections of physical bandwidth, as multiple time slots or frequency slots, to said priority groups by said active master server device in response to the bandwidth requirements of said streams and the transmission priority of said priority group;

wherein a larger number of time slots or frequency slots are assigned to higher priority groups;

assigning timeslot or frequency slot units of physical bandwidth to specific streams by said active master server device within each of said priority groups; and

reallocating said units of physical bandwidth if sufficient bandwidth on said shared network is not available to simultaneously support bandwidth requirements of said virtual networks.

8. A method as recited in claim 7, further comprising:

connecting a server device to a virtual network on a shared network;

said server device configured to communicate with any other server device connected to said shared network.

9. A method as recited in claim 8, further comprising:

detecting the presence of an active master server when a server device is newly connected to a corresponding virtual network on said shared network, and if no active master server is detected, designating said newly connected server device to function as said active master server; and

upon disconnection of said active master server, designating another said server device to function as said active master server.

10. A method as recited in claim 9, wherein said bandwidth within a given priority group is assigned on an as-needed basis to virtual networks utilizing up to their equal share of bandwidth within said given priority group, with additional available bandwidth being equally divided between virtual networks with unfulfilled bandwidth requests.

11. A method as recited in claim 9, further comprising:

reserving one or more slots to carry slot management communications, wherein said reserved slot, or slots, of physical bandwidth are not available for carrying streams.

12. A method as recited in claim 11, further comprising:

dynamically reassigning time slots in response to changes in available bandwidth, the number of streams being transmitted, and the priorities of the transmitted streams.

13. A method as recited in claim 7, further comprising:

assigning an ID to each server device operating on said shared network;

assigning a common key to each virtual network, including a first virtual network;

communicating with any of the devices on a virtual network requires encryption of the common key with the ID for the destination device;

transmitting an AV stream encoded with said common key over said shared network to other devices within the same virtual network; and

wherein devices within other virtual networks, including a second virtual network, are unable to decrypt communications from within the physical time slots or frequency slots of said first virtual network.

14. A method of allocating physical bandwidth among a plurality of virtual networks on the same shared physical power-line communication (PLC) network, comprising:

connecting a server device to a virtual network on a shared physical power-line communication (PLC) network;

said server device configured to communicate with at least one other said server device;

designating one of said server devices to function as an active master server on the shared network in response to said server device detecting that no master server devices are currently active on the shared network, wherein said server device commences operation as an active master server;

dynamically allocating physical bandwidth, by said active master server device which assigns one or more time slots or frequency slots, to each virtual network on said shared (PLC) network to which said server devices are connected;

reallocating said physical bandwidth by the active master server if sufficient physical bandwidth on said shared (PLC) network is not available to simultaneously support bandwidth requirements of said virtual networks;

detecting the presence of an active master server when a server device is newly connected to a corresponding virtual network on said shared network, and if no active master server is detected, designating said newly connected server device to function as said active master server; and

upon disconnection of said active master server, designating another said server device to function as said active master server.

wherein said server device is configured to detect the presence of an active master server when newly connected to a virtual network on said shared network and, if no active master server is detected, to become said active master server; and

wherein, upon disconnection of said active master server, another said server device becomes said active master server.

15. A method of allocating physical bandwidth among a plurality of virtual networks on the same shared physical power-line communication (PLC) network, comprising:

connecting a server device to a virtual network on a shared physical power-line communication (PLC) network;

said server device configured to communicate with at least one other said server device;

designating one of said server devices to function as an active master server on the shared network in response to said server device detecting that no master server devices are currently active on the shared network, wherein said server device commences operation as an active master server;

dynamically allocating physical bandwidth, by said active master server device which assigns one or more time slots or frequency slots, to each virtual network on said shared (PLC) network to which said server devices are connected;

reallocating said physical bandwidth by the active master server if sufficient physical bandwidth on said shared (PLC) network is not available to simultaneously support bandwidth requirements of said virtual networks;

assigning an ID to each server device operating on said shared network;

assigning a common key to each virtual network, including a first virtual network;

communicating with any of the devices on a virtual network requires encryption of the common key with the ID for the destination device; and

transmitting an AV stream encoded with said common key over said shared network to other devices within the same virtual network;

wherein devices within other virtual networks, including a second virtual network, are unable to decrypt communications from within the physical time slots or frequency slots of said first virtual network.