Wireless communication system and packet communication therefor

Patent metadata

Field	Value
Publication number	US-9706574-B2
Application number	US-201414524439-A
Country	US
Kind code	B2
Filing date	Oct 27, 2014
Priority date	Nov 14, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

Disclosed is a wireless communication system including: an access point; and at least two wireless devices capable of transmitting packets to the access point at the same time, wherein the access point receives a packet from at least one of the at least two wireless devices within multi-packet reception (MPR) capability after determining whether packet reception is beyond the multi-packet reception (MPR) capability, when receiving a request to send (RTS) from one of the at least two wireless devices. Thus, it is possible to obtain maximum throughput by optimally using the MPR capability and stably perform packet communication even though the number of wireless devices changes or the wireless device is moved.

First claim

What is claimed is:

1. A wireless communication system comprising:
an access point; and
at least two wireless devices capable of transmitting packets to the access point at the same time,
wherein the access point, in response to receiving a request to send (RTS) from one of the at least two wireless devices, receives a packet from at least one of the at least two wireless devices within multi-packet reception (MPR) capability after determining whether packet reception of the access point is beyond the multi-packet reception (MPR) capability,
wherein the access point determines whether to wait for an additional request to send (RTS) based on a function f=(M, Pr M ), the function f=(M, Pr M ) satisfies

Pr
M

≥

N
⁢

⁢
γ

1
-

(

M
-
1

)

⁢
γ

,

where M is an index of a node having minimum reception power, Pr M is reception power of a signal received from the M th node, N is background noise power, and γ is a capture threshold.

2. The wireless communication system according to claim 1 , wherein the access point determines whether packet reception is currently beyond the multi-packet reception (MPR) capability each time the request to send is received.

3. The wireless communication system according to claim 1 , wherein the access point receives a packet from a wireless device corresponding to a previously received request to send (RTS) excluding a current wireless device targeted for determination, when the access point determined that packet reception is beyond the multi-packet reception (MPR) capability.

4. The wireless communication system according to claim 1 , wherein the wireless devices comprise a tablet personal computer (PC), an Internet telephone, and an Internet television (TV).

5. The wireless communication system according to claim 1 , wherein determination as to whether packet reception is beyond the multi-packet reception (MPR) capability is performed using the index M and the reception power Pr M as variables.

6. The wireless communication system according to claim 3 , wherein, when there are at least two wireless devices corresponding to the previously received request to send (RTS), the access point receives packets from the at least two wireless devices at the same time.

7. A packet communication method of a wireless communication system, the method comprising:
by an access point, receiving a request to send (RTS);
by the access point, determining whether to wait for an additional request to send (RTS) after receiving the RTS; and
by the access point, waiting for the additional request to send (RTS), when the access point is determined to wait for the additional request to send (RTS), and transmitting a clear to send (CTS) to a wireless device, which can transmit packets simultaneously with another wireless device, corresponding to the request to send (RTS) received up to a current point of time, and receiving the packet from the wireless device, when the access point is determined not to wait for the additional request to send (RTS),
wherein determination as to whether to wait for the additional request to send is performed using a function f=(M, Pr M ), the function f=(M, Pr M ) satisfies

P

r
M

≥

N
⁢

⁢
γ

1
-

(

M
-
1

)

⁢
γ

,

where M is an index of a node having minimum reception power, Pr M is reception power of a signal received from the M th node, N is background noise power, and γ is a capture threshold.

8. The packet communication method according to claim 7 , wherein determination as to whether to wait for the additional request to send is performed each time there is a request to send.

9. The packet communication method according to claim 7 , wherein the wireless device corresponding to the request to send (RTS) used in determining whether to wait for the additional request to send (RTS) is excluded from target wireless devices that transmit the packets at the same time.

Assignees

• Gwangju Inst Science & Tech

Inventors

• Lim Hyuk
• Choi Wooyeol

Classifications

• H04W74/0816 Primary

  with collision avoidance · CPC title

• H04L12/2861

  Point-to-multipoint connection from the data network to the subscribers · CPC title

• H04L65/1069 Primary

  Session establishment or de-establishment · CPC title