US 8,411,612 B2Granted

Methods of performing cooperative communication in wireless LANs

AssigneeSungkyunkwan University Foundation for Corporation Collaboration

InventorsTae-Jin Lee, Chang-Yeong Oh

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Abstract

Method of performing cooperative communication in wireless LAN includes determining, by receiver, whether cooperative communication is necessary based on transmission request signal provided from transmitter, when it is determined that the cooperative communication is necessary, transmitting, by the receiver, transmission response signal instructing the cooperative communication, overhearing, by a plurality of devices, the transmission response signal instructing the cooperative communication, transmitting, by at least one of the devices, response signal for supporting relaying to the transmitter, selecting, by the transmitter, a relay based on the response signal, transmitting, by the transmitter, data to the relay, and attaching, by the relay, data of the relay to the data transmitted by the transmitter and transmitting result data to the receiver. Thus, average transmission rate of wireless LAN can be improved with minimized overhead, and additional transmission opportunity can be provided to relaying device, thereby properly rewarding relaying device.

Claims16

Dependent claims

A method of performing cooperative communication in a wireless local area network (LAN), the method comprising:

receiving, by a receiver, a transmission request signal;
determining, by the receiver, whether cooperative communication is necessary based on the received transmission request signal;
when it is determined that the cooperative communication is necessary, transmitting, by the receiver, a transmission response signal instructing the cooperative communication;
monitoring, by at least one device, the transmission response signal instructing the cooperative communication;
transmitting, by the at least one device, a response signal for supporting relaying to a transmitter;
selecting, by the transmitter, a relay from the at least one device based on the response signal for supporting relaying received from the at least one device;
and transmitting, by the transmitter, data to the selected relay, wherein the determining, by the receiver, whether cooperative communication is necessary includes, reading a newest transmission rate information of the transmitter transmitting the transmission request signal, determining whether the transmitter performs transmission at a maximum transmission rate based on the read newest transmission rate information, and when it is determined that the transmitter does not perform transmission at the maximum transmission rate, determining whether the cooperative communication is necessary, and wherein the response signal for supporting relaying includes first transmission rate information that is transmission rate information between the transmitter and the at least one device, and second transmission rate information that is transmission rate information between the at least one device and a receiver transmitting the transmission response signal instructing cooperative communication.

4 more elements

A method of performing cooperative communication in a wireless LAN, the method comprising:

monitoring, by a first device, a transmission response signal instructing cooperative communication;
selecting, by the first device, a backoff value for transmitting a response signal for supporting relaying;
and transmitting only once, by the first device, the response signal for supporting relaying based on the selected backoff value;
receiving, by the first device, first data from the transmitter;
attaching, by the first device, second data of the first device to the first data;
and transmitting, by the first device, the first data and the second data to a receiver, wherein the response signal, transmitted by the first device, for supporting relaying includes, first transmission rate information that is transmission rate information between a transmitter and the first device;
and second transmission rate information that is transmission rate information between the first device and a receiver.

4 more elements

A method of performing cooperative communication in a wireless LAN, the method comprising:

determining, by a receiver, whether cooperative communication is necessary based on a transmission request signal provided from a transmitter;
when it is determined that the cooperative communication is necessary, transmitting, by the receiver, a transmission response signal instructing the cooperative communication;
monitoring, by a plurality of devices, the transmission response signal instructing the cooperative communication;
transmitting, by at least one of the plurality of devices, a response signal for supporting relaying to the transmitter;
selecting, by a transmitter, a relay based on the response signal;
transmitting, by the transmitter, data to the relay;
and attaching, by the relay, data of the relay to the data transmitted by the transmitter and transmitting result data to the receiver, wherein the response signal for supporting relaying transmitted by the at least one device includes first transmission rate information and second transmission rate information, the first transmission rate information being transmission rate information between the transmitter and the at least one device, and the second transmission rate information being transmission rate information between the at least one device and the receiver, wherein the transmitting a response signal for supporting relaying includes transmitting a resultant signal to the transmitter, and wherein the selecting a relay based on the response signal for supporting relaying includes, selecting, as the relay, a device with a highest second transmission rate information among the second transmission rate information included in the response signal for supporting relaying;
and when there are two or more devices with the highest second transmission rate information, selecting, as the relay, a device with a highest first transmission rate information among the two or more devices.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/642,046Filed 18 Dec 2009
Priority: KR 10-2009-007314710 Aug 2009
Published: US 2011/0032864 A110 Feb 2011
Granted: 2 Apr 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04W 72/535
Allocation or scheduling criteria for wireless resources: based on resource usage policies
H04B 7/026
Site diversity; Macro-diversity: co-operative diversity, e.g. using fixed or mobile stations as relays
H04B 7/15592
Ground-based stations: adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same…
H04W 88/04
Terminal devices: adapted for relaying to or from another terminal or user