Method, apparatus and system of packet transmission

• US 7,489,650 B2
• Filed: 03/29/2004
• Issued: 02/10/2009
• Est. Priority Date: 03/29/2004
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Kondratiev, Vladimir, Ross, Rony, Ginzburg, Boris
• Primary Examiner(s): GELIN, JEAN ALLAND
• Application Number:
  US10/810,687
• Publication Number:
  US 20050213554A1
• Time in Patent Office: 1,779 Days
• Field of Search: 370/229, 370/235, 370/351, 370/389, 370/412, 370/310, 370/328, 370/338, 370/395.1, 370/396, 370/397, 370/392, 370/234, 370/231, 370/241, 370/252, 370/230, 370/232, 370/233, 370/253, 370/329, 370/314, 370/346, 370/349, 370/445, 370/449, 714/100, 714/1, 714/48, 714/55, 714/755, 714/721, 709/224, 709/229, 713/156
• US Class Current: 370/314
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Embodiments of the present invention provide a method, apparatus and system which may include selecting, based on a predetermined criterion, a modulation type and/or a protection mechanism to be used for transmission of a data packet, e.g., in wireless LAN communication system. Other embodiments are described and claimed.

Claims

1. A method for protecting packet transmissions by a multi-mode wireless communication station operating in a wireless network, the multi-mode wireless communication station configurable to transmit using either orthogonal frequency division multiplexed (OFDM) modulation or direct sequence spread spectrum/complementary code keying (DSSS/CCK) modulation, the method comprising:

collecting information to identify a legacy communication station currently operating in the network;

estimating a first time period (T_CTS) to successfully transmit a data packet using the OFDM modulation with request-to-send/clear-to-send (RTS/CTS) protection, estimating a second time period (T_RTS) to successfully transmit the data packet using the OFDM modulation with CTS-to-self protection, and estimating a third time period (T_CCK) to successfully transmit the packet using the DSSS/CCK modulation without protection; and

selecting the modulation and protection having the shortest of the time period for transmitting the data packet when a legacy communication station has been identified.

2. The method of claim 1, wherein collecting information comprises the multi-mode communication station being informed in a beacon transmission that one or more legacy communication stations are operating in the wireless network;

wherein the first, second and third time periods are estimated when at least one legacy communication station is operating,

wherein when no legacy communication stations are operating, the first, second and third time periods are not estimated and the method comprises selecting OFDM modulation with RTS/CTS for transmission of the data packet, and

wherein legacy communication stations communicate using DSSS/CCK modulation.

3. The method of claim 2,

wherein collecting information frirther comprises collecting information to identify any hidden nodes currently operating in the network, and

wherein the method further comprises selecting OFDM modulation with RTS/CTS protection for transmission of the data packet when a hidden node is detected.

4. The method of claim 2, wherein estimating further comprises estimating a power consumption for successful transmission of said data packet associated with each of the time periods.

5. The method of claim 3, wherein estimating comprises estimating each of the time periods based on one or more of a length of said data packet, a collision probability, and a rate of the associated modulation.

6. A multi-mode wireless communication station operating in a wireless network, the multi-mode wireless communication station configurable to transmit using either orthogonal frequency division multiplexed (OFDM) modulation or direct sequence spread spectrumlcomplementary code keying (DSSS/CCK) modulation, the station comprising;

a controller configured to;

collecting information to identify a legacy communication station currently operating in the network;

the controller further configured to estimate first time period (T_CTS) to successfull transmit a data packet using the OFDM modulation with request-to-send/clear-to-send (RTS/CTS) protection, estimating a second time period (T_RTS) to successfully transmit the data packet using the OFDM modulation with CTS-to-self protection, and estimating a third time period (T_CCK) to successfully transmit the packet using the DSSS/CCK modulation without protection; and

the controller further configured to select the modulation and protection having the shortest of the time period for transmitting the data packet when a legacy communication station has been identified.

7. The multi-mode wireless communication station of claim 6, wherein the controller collects information from a beacon transmission indicating that one or more legacy communication stations are operating in the wireless network;

wherein the first, second and third time periods are estimated by the controller when at least one legacy communication station is operating,

wherein when no legacy communication stations are operating, the first, second and third time periods are not estimated by the controller and the controller selects OFDM modulation with RTS/CTS for transmission of the data packet, and

wherein legacy communication stations communicate using DSSS/CCK modulation.

8. The multi-mode wireless communication station of claim 7, wherein the controller is further configured to collect information to identify any hidden nodes currently operating in the network, and

wherein the controller is configured to select OFDM modulation with RTS/CTS protection for transmission of the data packet when a hidden node is detected.

9. The multi-mode wireless communication station of claim 7, wherein said controller is configured to estimate each of the time periods based on one or more of a length of said data packet, a collision probability, and a rate of the associated modulation type.

10. The multi-mode wireless communication station of claim 7, wherein the controller is further configured to estimate a power consumption for successful transmission of said data packet associated with each of the time periods.