The invention relates to a method of communication in respect of transmitting/receiving stations (1, 2) in a wireless communication network, in which method first multi-receiver frames are exchanged between a station and a plurality of other stations and second mono-receiver frames are exchanged between a transmitting station and a receiving station, the first frames being transmitted in an omnidirectional manner.
The invention is intended more particularly for a company or domestic wireless communication network using, for example, the IEEE802.11a/g American standard or the Hiperlan/2 European standard of the ETSI (European Telecommunications Standards Institute).
The performance of wireless communication is limited, chiefly in an enclosed space, by the attenuation of the power of the signal with distance, noise, interference with other electrical equipment, and also by the multipath effect due to the reflection of the waves off obstacles such as walls. These performance problems are set forth in the article “System Applications for Wireless Indoor Communications” by A. S. Acampora published in August 1987 in “IEEE communications magazine—volume 25; No. 8”
In the IEEE802.11a/g standard, the communications between the fixed or mobile stations of the network, more particularly computers and access points (or nodes of the network), are effected by transfer of:
The mechanism of basic access between the stations, called “DCF” (“Distributed Coordination Function”) follows the “CSMA/CA” protocol (“Carrier Sense Multiple Access with Collision Avoidance”) described hereinbelow, so as to avoid collisions between frames:
The RTS and CTS frames are multi-receiver frames that have to be received by all the stations of the network that are liable to communicate with the two stations, while the DATA and ACK frames are mono-receiver frames that have only to be received by the two stations that are communicating.
Currently, in a wireless communication network, each station of the network makes use of omnidirectional antennas for dispatching all the types of frames indicated above. The extent of the coverage, the robustness of the network and the throughput of data transfer depends on the mode of transmission utilized by the physical layer of the antenna. These physical modes are defined by their modulation type and their FEC (stands for “Forward Error Correction”) rate. For the IEEE802.11a/g standards and the Hiperlan/2 standard, these modes are defined by tables 1 and 2 with their throughput. In each table, the modes are classified from the more robust mode (lower throughput) to the less robust mode (higher throughput). At a given modulation type (e.g BPSK), the modes are classified from the lower FEC rate (e.g. BPSK 1/2) to the higher FEC rate (e.g. BPSK 3/4).
These standards use a OFDM modulation, thus the modes given above correspond to the modulation of the sub-carriers.
The more extensive the coverage, the greater the number of robust communications that are set up, and the lower the throughput. When a communication is made in robust mode, for example BPSK1/2, the coverage is extensive, but the throughput is low, while when a communication is made in higher mode, for example 64QAM3/4, the throughput is greater but the coverage is restricted (see IEEE 802.11a/g standard for other modes of transmission). Consequently a wireless communication network with stations equipped with omnidirectional antennas exhibits limited coverage and a relatively low communication throughput. Furthermore the communications are subject to multipath effects which degrade the operation of the network. Moreover, certain systems are known which use antenna diversity in reception to improve performance.
The aim of the invention is to improve the communications in a wireless communication network, such as indicated hereinabove, by increasing the throughput of the network in a general manner.
More particularly, the invention is a method of communication in respect of transmitting/receiving stations in a wireless communication network, in which method first multi-receiver frames are exchanged between a station and a plurality of other stations and second mono-receiver frames are exchanged between a transmitting station and a receiving station. The first frames are transmitted in an omnidirectional manner. The second frames are transmitted in a directional manner. With the method of communication according to the invention, the omnidirectional transmission (both when sending and receiving) is effected in a more robust fashion than the directional transmission.
According to a further feature of the method according to the invention, the most robust transmission is effected at a lower throughput than the least robust transmission. With the method of communication according to the invention, each station of the network is equipped with an omnidirectional antenna for the transmission of the RTS and CTS frames in particular and with one or more directional antennas for the transmission of the DATA and ACK frames. This arrangement affords an increase in the throughput and in the quality of the communication between the stations and in particular by boosting the throughput of the mono-receiver messages.
With the method of communication according to the invention, the mono-receiver frames are modulated by a modulation with a first number of phases, the multi-receiver frames are modulated by a modulation with a second number of phases, and the first number of phases is higher than the second number of phases.
Preferably, the mono-receiver frames are modulated by a modulation with more than two phases and the multi-receiver frames are modulated by a two phases modulation.
According to a further feature of the method according to the invention, the mono-receiver frames are coded with a first forward error correction rate, the multi-receiver frames are coded with a second forward error correction, and the first rate is higher than the second rate.
According to a particular embodiment of the invention, the mono-receiver frames and the multi-receiver frames are modulated by the same modulation.
In accordance with another aspect of the invention, the transmission is in compliance with one of the standard belonging to the set comprising:
The transmission can be further in compliance with IEEE 802.11g .
The invention extends to a transmitting and/or receiving station for a wireless communication network. The station is devised to transmit and/or receive multi-receiver frames in an omnidirectional manner and to transmit and/or receive mono-receiver frames in a directional manner. More precisely, the station comprises means to transmit and/or receive multi-receiver frames in an omnidirectional manner and means to transmit and/or receive mono-receiver frames in a directional manner, the transmission in a omnidirectional manner being effected in a more robust fashion than the transmission in a directional manner.
According to one embodiment of the invention, the station is adapted to transmit and/or receive mono-receiver frames which are modulated by a modulation with a first number of phases and multi-receiver frames which are modulated by a modulation with a second number of phases, the first number of phases being higher than the second number of phases.
According to a particular embodiment of the invention, the station is adapted to transmit and/or receive mono-receiver frames which are modulated by a modulation with more than two phases and multi-receiver frames which are modulated by a two phases modulation.
According to one embodiment of the invention, the station is adapted to transmit and/or receive mono-receiver frames which are coded with a first forward error correction rate and multi-receiver frames which are coded with a second forward error correction, the first rate being higher than the second rate.
According to a particular embodiment of the invention, the station is adapted to transmit and/or receive mono-receiver frames and multi-receiver frames which are modulated by the same modulation.
The transmitting/receiving station according to the invention comprises at least one omnidirectional antenna and one or more directional antennas, for example four directional antennas oriented at 90° with respect to one another.
In accordance with another aspect of the invention, the stations are adapted to transmit in compliance with one of the standard belonging to the set comprising:
The stations are further adapted to transmit in compliance with IEEE 802.11g.
The invention extends further to a wireless communication network comprising one or more such transmitting/receiving stations.
The method and the station according to the invention are described in greater detail hereinbelow and illustrated by the drawings.
Illustrated in
It is therefore understood that with the method according to the invention the multi-receiver frames such as RTS and CTS are dispatched by the stations of the network with the help of omnidirectional antennas whereas the mono-receiver frames such as DATA and ACK are dispatched and received by the stations with the help of directional antennas.
Depicted in
The stations 1 to 4 may be fixed or mobile computers, access points of the network or audio and video apparatuses.
In the communication between the stations 1 and 2, the station 3 receives the RTS frame which contains the information on the duration of the communication between the stations 1 and 2. Moreover, the station 4 receives the CTS frame which also contains the information on the duration of the communication between the stations 1 and 2 by dint of the network topology illustrated in
Of course, the stations 1 and 2 must use known algorithms for determining the best directional antenna both in reception and in transmission.
In particular the choice of the best directional antenna in transmission and reception may be based on the analysis of test frames exchanged between the two stations and of measurement of the power of the signal received with updating of a table in each station where a directional antenna of a station is matched up in correspondence with a directional antenna of the other station, the directional antennas of the two stations being usable both for transmission and for reception.
The use of omnidirectional antennas according to a low throughput mode of transmission for dispatching multi-receiver frames, of small sizes and hence not needing to be sent with a high throughput, allows very good coverage of the network, thus limiting to the maximum the interference and the collisions between the frames and allowing other neighbouring networks to detect activity, these latter thus being able to switch to another channel to make their communications.
Moreover, the use of directional transmitting/receiving antennas according to a high throughput mode for the transfer of the mono-receiver frames, which are frames of large size, makes it possible to increase the communication throughput in the network. Furthermore, by virtue of their directivity, the directional antennas improve the signal-to-noise and signal-to-interference ratios and hence improve the antenna gain on transmission and on reception, resulting in an overall improvement to the communication in the network.
Represented very diagrammatically in
The omnidirectional antenna 11 can be arranged so as to send and/or receive multi-receiver frames in the robust mode of transmission (for example, multi-receiver frames are modulated by a two phases modulation, e.g. BPSK1/2) and each directional antenna 12a to 12d may be arranged so as to send or receive mono-receiver frames in a higher mode (for example, mono-receiver frames are modulated by a modulation with more than two phases, e.g. QPSK, 8PSK, 16 ou 64QAM3/4). It should be understood that the most robust transmission is effected at a lower throughput than the least robust transmission. More generally, the most robust transmission is based on a physical mode of lower throughput. For example, the multi-receiver frames are modulated by a physical mode, e.g. BPSK 1/2 (resp. QPSK 1/2), and mono-receiver frames are modulated by a physical mode of higher throughput, e.g. QPSK 1/2 (resp. QPSK3/4, or 16QAM 3/4, or 64QAM2/3, or 64QAM 3/4).
Thus according to another embodiment of the invention, the multi-receiver frames are modulated by a four phases modulation, e.g. QPSK 1/2 (resp. QPSK 3/4), and mono-receiver frames are modulated by a more than four phases modulation, e.g. 16QAM 1/2 (resp. 16QAM 3/4, or 64QAM2/3, or 64QAM 3/4).
According to another embodiment of the invention, the multi-receiver frames are modulated by a four phases modulation with a lower FEC rate rate, e.g. QPSK 1/2 (resp. 16QAM 1/2), and mono-receiver frames are modulated by a four phases modulation with a higher FEC rate, e.g. QPSK 3/4 (resp. 16QAM 3/4).
Of course a station according to the invention can comprise more or fewer than four directional antennas. A station configured to implement the method of communication according to the invention remains of course compatible in respect of a communication with stations that do not apply the principle of communication according to the invention.
The invention can be applied to standards other than the IEEE802.11a/g or Hiperlan/2 standards provided that the communications are effected by means of multi-receiver frames and of mono-receiver frames.
Number | Date | Country | Kind |
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0312251 | Oct 2003 | FR | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP04/11618 | 10/14/2004 | WO | 4/12/2006 |