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Publicado: 5 de septiembre de 2011
IEEE P802.11
Wireless LANs
Coexistence between Bluetooth and IEEE 802.11 CCK
Solutions to avoid mutual interference
Date: July 4, 2000
Author: Ad Kamerman
Lucent Technologies- WCND
Zadelstede 1-10
Phone: (+31) 30 6097479
Fax: (+31) 30 6097556
e-Mail: kamerman@lucent.com
Abstract
This document describes coexistence issues between Bluetoothand 802.11b and gives a number of approaches to minimize mutual interference.
1. Introduction
Bluetooth and IEEE 802.11 devices use the same 2.4 GHz band and without furtherprovisions they will interfere each other. This paper looks to the nature of the interference and to modifications in the medium access scheme for both type of devices to minimize theinterference risk. These modifications have impact on the link / medium access controller and baseband signal processing. They will not influence the product cost.
The analysis madein this paper is based on the characteristics as described in the Bluetooth WebPages, and IEEE 802.11 specifications for CCK/DS [2] and FH [1]. The 802.11 FH information is appliedto estimate some characteristics of Bluetooth. Bluetooth has a bit rate of 1 Mbit/s and for 802.11 CCK/DS we consider the bit rate of 11 Mbit/s. The fallback rates which give morerobustness, are not considered in this paper. Lower 802.11 bit rates (5.5 Mbit/s, 2 Mbit/s and 1 Mbit/s) will have more robustness.
There is looked to receive and interference levelsaround active devices and what signal-to-interference level can be tolerated for both system. Next, three solutions to provide coexistence between the two type of systems have beenworked out. These are based on respectively another hopping and power level, medium access control enhancement based on in-channel signal and hop-stretching and packet fragmentation.
Wireless LANs
Coexistence between Bluetooth and IEEE 802.11 CCK
Solutions to avoid mutual interference
Date: July 4, 2000
Author: Ad Kamerman
Lucent Technologies- WCND
Zadelstede 1-10
Phone: (+31) 30 6097479
Fax: (+31) 30 6097556
e-Mail: kamerman@lucent.com
Abstract
This document describes coexistence issues between Bluetoothand 802.11b and gives a number of approaches to minimize mutual interference.
1. Introduction
Bluetooth and IEEE 802.11 devices use the same 2.4 GHz band and without furtherprovisions they will interfere each other. This paper looks to the nature of the interference and to modifications in the medium access scheme for both type of devices to minimize theinterference risk. These modifications have impact on the link / medium access controller and baseband signal processing. They will not influence the product cost.
The analysis madein this paper is based on the characteristics as described in the Bluetooth WebPages, and IEEE 802.11 specifications for CCK/DS [2] and FH [1]. The 802.11 FH information is appliedto estimate some characteristics of Bluetooth. Bluetooth has a bit rate of 1 Mbit/s and for 802.11 CCK/DS we consider the bit rate of 11 Mbit/s. The fallback rates which give morerobustness, are not considered in this paper. Lower 802.11 bit rates (5.5 Mbit/s, 2 Mbit/s and 1 Mbit/s) will have more robustness.
There is looked to receive and interference levelsaround active devices and what signal-to-interference level can be tolerated for both system. Next, three solutions to provide coexistence between the two type of systems have beenworked out. These are based on respectively another hopping and power level, medium access control enhancement based on in-channel signal and hop-stretching and packet fragmentation.
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