Efficient time-division multiplexed addressing protocol

• US 7,616,621 B2
• Filed: 05/08/2006
• Issued: 11/10/2009
• Est. Priority Date: 03/13/2000
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Morris, Martin
• Primary Examiner(s): Ton; Dang T
• Assistant Examiner(s): Mansoury; Nourali
• Application Number:
  US11/429,802
• Publication Number:
  US 20060203796A1
• Time in Patent Office: 1,282 Days
• Field of Search: 370/336, 370/337, 370/345, 370/346, 370/348, 370/338, 370/503, 370/352, 370/443, 370/350
• US Class Current: 370/346
• CPC Class Codes: H04L 61/5038 for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

A method for operating in a network that includes one or more of the following: assigning a respective active member address to each of a plurality of first slave nodes participating in a piconet; receiving a request to join the piconet; determining that no more different active member address are available in the piconet; determining that a second slave node supports extended addressing; and performing calculations as a function of the bandwidth requirements of the second slave node to determine whether to share an assigned active member address with the second slave node.

Claims

1. A method for operating in a Bluetooth network, comprising:

assigning a respective active member address to each of a plurality of first slave nodes participating in a piconet such that each of the plurality of first slave nodes has a different active member address and such that no more different active member addresses are available in the piconet;

receiving a request to join the piconet from a second slave node, the request comprising information relating to bandwidth requirements of the second slave node;

determining that no more of the different active member addresses are available in the piconet;

determining that the second slave node supports extended addressing, the extended addressing allowing the second slave node and at least one of the plurality of first slave nodes to be concurrently assigned the same active member address; and

performing calculations as a function of the bandwidth requirements of the second slave node to determine whether to share an assigned active member address with the second slave node.

2. The method according to claim 1, wherein the respective active member address is a respective Bluetooth address AM_ADDR.

3. The method according to claim 1, wherein the plurality of first slave nodes is seven slave nodes.

4. The method according to claim 1, wherein the piconet comprises a master node that performs the calculations as a function of the bandwidth requirements of the second slave node to determine whether to share the assigned active member address with the second slave node.

5. The method according to claim 1, wherein performing the calculations comprises dividing a Bluetooth data rate by the bandwidth requirements of the second slave node.

6. The method according to claim 5, wherein performing the calculations comprises mathematically truncating a numerical result of dividing the Bluetooth data rate by the bandwidth requirements of the second slave node.

7. The method according to claim 1, wherein performing the calculations comprises calculating a maximum number of slave nodes of a particular bandwidth that can be assigned to a particular active member address.

8. The method according to claim 6, wherein performing the calculations comprises determining a largest mathematical power of two which is less than or equal to the maximum number.

9. The method according to claim 1, comprising:

maintaining a look up table of active member address assignments.

10. The method according to claim 9, wherein the look up table comprises information related to each slave node in the piconet.

11. The method according claim 9, wherein performing the calculations comprises performing the calculations using the information in the look up table.

12. The method according to claim 9, wherein, for each slave node in the piconet, the look up table comprises information related to a respective bandwidth requirement and information related the respective active member address.

13. The method according to claim 9, wherein, for each slave node in the piconet, the look table comprises information as to whether a particular slave node supports the extended addressing and, if the particular slave node supports the extended addressing, information related to a respective address extension.

14. The method according to claim 1, wherein the calculations are performed with respect to each active member address.

15. The method according to claim 1, comprising:

evaluating bandwidth characteristics of ones of the plurality of first slave nodes assigned to a first active member address and a second active member address to determine which of the first active member address and the second active member address is a better candidate for sharing bandwidth with the second slave node.

16. The method according to claim 1, comprising:

polling each active member address in the piconet in a first polling cycle;

during the first polling cycle, transmitting by a particular slave node after the respective active member address assigned to the particular slave node is polled;

polling each active member address in the piconet in a second polling cycle, the second polling cycle following the first polling cycle;

during the second polling cycle, transmitting by another particular slave node after the respective active member address assigned to the another particular slave node is polled, the respective active member address assigned to the another particular slave node is also assigned to the particular slave node; and

during the second polling cycle, the particular slave node not transmitting.

17. The method according to claim 16, comprising:

during the first polling cycle and the second polling cycle, one of the plurality of first slave nodes that is not sharing its respective active member address, transmitting after its respective active member address is polled.

18. The method according to claim 1, comprising:

polling each active member address in the piconet in a first polling cycle;

during the first polling cycle, transmitting by a particular slave node after the respective active member address assigned to the particular slave node is polled;

polling each active member address in the piconet in a second polling cycle, the second polling cycle following the first polling cycle; and

during the second polling cycle, the particular slave node not transmitting even though its respective active member address is polled because of its assigned extension address.