Channelization scheme for wireless local area networks

• US 20030171115A1
• Filed: 07/31/2002
• Published: 09/11/2003
• Est. Priority Date: 03/07/2002
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Batra, Anuj, Shoemake, Matthew B., Anim-Appiah, Kofi
• Granted Patent: US 7,272,358 B2
• Time in Patent Office: Days
• US Class Current: 455/434
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A four channel wireless network channelization scheme is described that is particularly usable in the ISM frequency band between 2400 MHz and 2483.5 MHz. The preferred channelization scheme permits access points to be set at one of four frequencies in the ISM band, not three as taught by the IEEE 802.11b standard. This channelization scheme takes advantage of the fact that only 20 MHz is typically needed between adjacent access point channels, not 25 MHz as is taught by the 802.11b standard. With four channels to choose from, a higher density of access points can be located thereby accommodating a higher density of users. The four channels preferably are 2407, 2427, 2447 and 2467 MHz. With this selection of channel frequencies and given the current FCC regulations, all four channels can be used to transmit an equal amount of power.

Claims

1. A wireless network operating in the ISM frequency band between 2400 MHz and 2483.5 MHz, comprising:

a plurality of access points to which wireless devices communicate;

each access point implementing a channelization scheme in which the access point can be set to a carrier frequency selected from a group of four frequencies consisting of a first frequency, a second frequency, a third frequency and a fourth frequency;

wherein the first frequency is between 2406.938 MHz and 2407.062 MHz, inclusive, the second frequency is between 2426.938 MHz and 2427.062 MHz, inclusive, the third frequency is between 2446.938 MHz and 2447.062 MHz, inclusive, and the fourth frequency is between 2466.938 MHz and 2467.062 MHz, inclusive.

2. The wireless network of claim 1 wherein the first frequency is 2407 MHz.

3. The wireless network of claim 1 wherein the second frequency is 2427 MHz.

4. The wireless network of claim 1 wherein the third frequency is 2447 MHz.

5. The wireless network of claim 1 wherein the fourth frequency is 2467 MHz.

6. The wireless network of claim 1 wherein the first frequency is 2407 MHz, the second frequency is 2427 MHz, the third frequency is 2447 MHz, and the fourth frequency is 2467 MHz.

7. An access point usable in a wireless network operating in the ISM frequency band between 2400 MHz and 2483.5 MHz, comprising:

an antenna to permit communications with a wireless device; and

an interface to a wire-based network;

wherein the access point implements a channelization scheme in which the access point can be set to a carrier frequency selected from a group of four frequencies consisting of a first frequency, a second frequency, a third frequency and a fourth frequency;

wherein the first frequency is between 2406.938 MHz and 2407.062 MHz, inclusive, the second frequency is between 2426.938 MHz and 2427.062 MHz, inclusive, the third frequency is between 2446.938 MHz and 2447.062 MHz, inclusive, and the fourth frequency is between 2466.938 MHz and 2467.062 MHz, inclusive.

8. The access point of claim 7 wherein the first frequency is 2407 MHz.

9. The access point of claim 7 wherein the second frequency is 2427 MHz.

10. The access point of claim 7 wherein the third frequency is 2447 MHz.

11. The access point of claim 7 wherein the fourth frequency is 2467 MHz.

12. The access point of claim 7 wherein the first frequency is 2407 MHz, the second frequency is 2427 MHz, the third frequency is 2447 MHz, and the fourth frequency is 2467 MHz.