Time-based coexistence method for wireless communication

• US 7,948,934 B2
• Filed: 07/27/2006
• Issued: 05/24/2011
• Est. Priority Date: 08/04/2005
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Espina, Javier, Boleko, Salvador E., Dalmases, Francesc, Falck, Thomas
• Primary Examiner(s): Lin; Kenny S
• Application Number:
  US11/997,664
• Publication Number:
  US 20080232345A1
• Time in Patent Office: 1,762 Days
• Field of Search: 370/324, 370/328
• US Class Current: 370/328
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 74/02 Hybrid access

Abstract

A method for facilitating coexistence of wireless technologies competing for the same bandwidth includes, with a first component (14) residing in a first wireless network (20), initializing the first wireless network (20) with a superframe period (38) based on a superframe period (28) of a second wireless network (10) and communicating information over the first wireless network (20) within the Contention Free Period period (46) of the superframe period (38) of the first wireless network (20), and, with a second component (4) residing in the second wireless network (10), communicating information over the second wireless network (10) within the Contention Access Period (44) of the superframe period (38), the Contention Free Period (46) and the Contention Access Period (44) being distinct regions of the superframe period (38) of the first wireless network (20).

Claims

1. A method for facilitating coexistence of wireless technologies competing for the same bandwidth in which (a) a first wireless network is based on a time-slotted medium access mechanism and includes a configurable frame with at least a beacon, a Contention Access Period, a Contention Free Period, and, optionally, an inactive period, and (b) a second wireless network is based on a time-slotted medium access mechanism, uses slot pair channels with each slot of the pair being about half the slot pair length, periodically scans time slots for interference, and uses free time slots, the method comprising:

with a first component residing in the first wireless network, initializing the first wireless network with a superframe period based on a superframe period of the second wireless network and communicating information over the first wireless network within the Contention Free Period of the superframe period of the first wireless network; and

with a second component residing in the second wireless network, communicating information over the second wireless network within the Contention Access Period of the superframe period, the Contention Free Period and the Contention Access Period being distinct regions of the superframe period of the first wireless network.

2. The method as set forth in claim 1, further including:

a detection component, obtaining the superframe period of the second wireless network and computes the superframe period of the first wireless network as a function of the superframe period of the second wireless network.

3. The method as set forth in claim 1, further including:

a detection component that resides in the first wireless network, computing the superframe period of the first wireless network based on the following;

T_B=T_A/(2*N),

wherein T_B represents the superframe period of the first wireless network, T_A is the superframe period of the second wireless network, and N is an integer equal to or greater than one.

4. The method as set forth in claim 1, further including:

with the first component, defining a Contention Access Period period and a Contention Free Period period for the superframe period of the first wireless network.

5. The method as set forth in claim 1, further including:

reserving the Contention Free Period for communication by components residing on the first wireless network.

6. The method as set forth in claim 1, further including:

with the first component, transmitting dummy information in unused time slots in the Contention Free Period to notify other components scanning for available time slots that the unused time slots are reserved for communication only by components residing on the first wireless network.

7. The method as set forth in claim 1, further including:

defining a minimum number of time slots in the Contention Access Period which ensures that time slots are available for the second wireless network.

8. The method as set forth in claim 1, further including determining at least one of a beginning of the Contention Free Period and a duration of the superframe period of the first wireless network, using componentry of the second component that senses activity of the first wireless network.

9. The method as set forth in claim 1, further including:

with the second component residing in the second wireless network, scanning a frequency band shared with the first component and locating available time slots in the Contention Access Period.

10. The method as set forth in claim 1, wherein the first component is an IEEE 802.15.4 based component and the second component is a DECT based component.

11. An apparatus, comprising:

a first component that resides in a first wireless network, which is based on a time-slotted medium access mechanism, including a configurable superframe with at least a beacon, a Contention Access Period, and a Contention Free Period, the Contention Access Period and the Contention Free Period being distinct;

a second component that resides in a second wireless network, which is based on a time-slotted medium access mechanism, including a superframe period having a plurality of slot channels pairs;

a means for initializings the superframe of the first wireless network based on the superframe period of the second wireless network;

a means for communicating within the Contention Free Period of the superframe of the first wireless network by the first component; and

a means for communicating in free slots in the second wireless network within the Contention Access Period of the superframe of the first network by the second component.

12. A system for facilitating coexistence of wireless technologies competing for the same bandwidth, comprising:

a first component which communicates over an associated first network, the first component including;

a first transmitter which transmits information;

a first receiver which receives information;

a first wireless protocol used by the first transmitter and the first receiver to transmit and receive information, respectively; and

a configuration component that reserves a region within a superframes for its communication and defines another region within the superframes for communication by components employing a different network protocol that competes with the first wireless protocol for bandwidth.

13. The system as set forth in claim 12, wherein the region is a Contention Free region with time slots dedicated for communication by the first component and the another region is a Contention Access region that is shared by one or more competing networks.

14. The system as set forth in claim 12, wherein the configuration component computes the superframe of the first wireless network based on a superframe period of a second wireless network.

15. The system as set forth in claim 14, wherein the superframe of the first wireless network is computed based on the following algorithm:

T_B=T_A/(2*N),

wherein T_B represents a superframe period of the superframe of the first wireless network, T_A is the superframe period of the second wireless network, and N is an integer equal to or greater than one.

16. The system as set forth in claim 12, wherein the transmitter periodically transmits dummy packets for unused time slots within the region to ensure unused, but reserved time slots are not mistakenly considered available time slots for components residing on a second wireless network.

17. The system as set forth in claim 12, further including a second component which communicates over an associated second network, the second component including:

a second transmitter which transmits information;

a second receiver which receives information;

a second wireless protocol used by the second transmitter and the second receiver to transmit and receive information, respectively;

wherein the second component scans for and uses available time slots within the another region for communication over the second wireless network.

18. The system as set forth in claim 17, wherein the second component further includes:

a detection component that interprets frames associated with first wireless network to determine at least one a beginning of the region and a duration of the superframe.

19. The system as set forth in claim 17, wherein the first component is an IEEE 802.15.4 based component and the second component is a DECT based component.

20. A method for facilitating coexistence of an IEEE 802.15.4 based network and a DECT based network, comprising:

determining, by a component, a superframe of the DECT based network;

computing a superframe of the IEEE 802.15.4 based network as a function of the superframe of the DECT based network;

defining a Contention Free Period within the superframe of the IEEE 802.15.4 based network for communication by one or more devices residing within the IEEE 802.15.4 based network;

defining a Contention Access Period within the superframe of the IEEE 802.15.4 based network for communication by one or more devices residing within the DECT based network;

using the Contention Free Period for communication by the one or more devices residing within the IEEE 802.15.4 based network; and

using the Contention Access Period for communication by the one or more devices residing within the DECT based network.

21. The method as set forth in claim 20, wherein the superframe of the IEEE 802.15.4 based network is computed based on the following algorithm:

T_IEEE802.15.4=T_DECT/(2*N),

wherein T_TIEEE represents a superframe period of the IEEE 802.15.4 based network, T_DECT represents a superframe period of the DECT based network, and N is an integer equal to or greater than one.

22. An apparatus for performing the method of claim 20.