Access control system for wireless-lan terminals

Claim 2

An access control method of a wireless terminal in a wireless network employing a carrier sense multiple access (CSMA) scheme, said method comprising the steps of: monitoring the termination of a transmission inhibition period; monitoring the occurrence of a transmission request; generating a random-determined time period when said transmission request occurs during said transmission inhibition period, said random-determined time period starting from said termination of said transmission inhibition period; waiting to start data transmission associated with said transmission request until said random-determined time period has elapsed after said termination of said transmission inhibition period; checking whether a predetermined channel for transmission is available at the end of said random-determined time period; and starting said data transmission associated with said transmission request when said random-determined time period has elapsed and said predetermined channel for transmission is available.

Claim 3

The access control method according to claim 1, wherein said transmission inhibition period is a total of a data reception period and a predetermined time period following said data reception period, said predetermined time period is previously determined depending on said wireless network.

Claim 4

The access control method according to claim 2, wherein said predetermined time period is determined by an interframe spacing (IFS) period for spacing between data frames, and said random-determined time period is determined by a predetermined backoff processing procedure.

Claim 5

An access control method of a wireless terminal in a wireless network employing a carrier sense multiple access (CSMA) scheme, said method comprising the steps of: a) monitoring the termination of data reception; b) monitoring the occurrence of a transmission request; c) generating a time period when said data reception is terminated, said time period starting from said termination of said data reception, and said time period being predetermined depending on said wireless network; d) generating a random amount of time when said transmission request occurs during a transmission inhibition period comprising a total of a data reception period and said time period; e) waiting to start data transmission associated with said transmission request until said random amount of time comes to an end; f) checking whether a predetermined channel for transmission is available at the end of said random amount of time; g) starting said data transmission associated with said transmission request when said random amount of time has elapsed and said predetermined channel for transmission is available; h) repeating said steps (d)-(g) while said predetermined channel for transmission is not available until the repetition number reaches a predetermined maximum value; and i) stopping said step (g) when said predetermined channel for transmission is not available with the repetition number exceeding said predetermined maximum value.

Claim 6

An access control method of a wireless terminal in a wireless network employing a carrier sense multiple access (CSMA) scheme, said method comprising the steps of: a) monitoring the termination of data reception; b) monitoring the occurrence of a transmission request; c) generating a time period when said data reception is terminated, said time period starting from said termination of said data reception, and said time period being predetermined depending on said wireless network; d) generating a random amount of time when said transmission request occurs during a transmission inhibition period comprising a total of a data reception period and said time period; e) waiting to start data transmission associated with said transmission request until said random amount of time comes to an end; f) checking whether a predetermined channel for transmission is available at the end of said random amount of time; g) starting said data transmission associated with said transmission request when said random amount of time has elapsed and said predetermined channel for transmission is available; h) repeating said steps (d)-(g) while said predetermined channel for transmission is not available until the repetition number reaches a predetermined maximum value; and i) stopping said step (g) when said predetermined channel for transmission is not available with the repetition number exceeding said predetermined maximum value.

Claim 7

The access control method according to claim 4, wherein said time period is determined by an interframe spacing (IFS) period for spacing between data frames, and said random amount of time is determined by a predetermined backoff processing procedure.

Claim 8

The access control method according to claim 4, wherein said wireless network employs a carrier sense multiple access with collision detection (CSMA/CD) scheme.

Claim 9

An access control system of a wireless terminal in a wireless network employing a carrier sense multiple access (CSMA) scheme, said system comprising: first monitoring means for monitoring the termination of a transmission inhibition period; second monitoring means for monitoring the occurrence of a transmission request; generating means for generating a random-determined time period when said transmission request occurs during said transmission inhibition period, said random-determined time period starting from said termination of said transmission inhibition period; and control means for controlling a transmission process such that data transmission associated with said transmission request waits until said random-determined time period has elapsed after said termination of said transmission inhibition period, it is checked whether a predetermined channel for transmission is available at the end of said random-determined time period, and said data transmission associated with said transmission request is started when said random-determined time period has elapsed and said predetermined channel for transmission is available.

Claim 10

An access control system of a wireless terminal in a wireless network employing a carrier sense multiple access (CSMA) scheme, said system comprising: first monitoring means for monitoring the termination of a transmission inhibition period; second monitoring means for monitoring the occurrence of a transmission request; generating means for generating a random-determined time period when said transmission request occurs during said transmission inhibition period, said random-determined time period starting from said termination of said transmission inhibition period; and control means for controlling a transmission process such that data transmission associated with said transmission request waits until said random-determined time period has elapsed after said termination of said transmission inhibition period, it is checked whether a predetermined channel for transmission is available at the end of said random-determined time period, and said data transmission associated with said transmission request is started when said random-determined time period has elapsed and said predetermined channel for transmission is available.

Claim 11

The system according to claim 7, wherein said transmission inhibition period is a total of a data reception period and a predetermined time period following said data reception period, said predetermined time period is previously determined depending on said wireless network.

Claim 12

The system according to claim 8, wherein said predetermined time period is determined by an interframe spacing (IFS) period for spacing between data frames, and said random-determined time period is determined by a predetermined backoff processing procedure.

Claim 13

An access control system of a wireless terminal in a wireless network employing a carrier sense multiple access (CSMA) scheme, said system comprising: first monitoring means for monitoring the termination of data reception; second monitoring means for monitoring the occurrence of a transmission request; first generating means for generating a time period when said data reception is terminated, said time period starting from said termination of said data reception, and said time period being predetermined depending on said wireless network; second generating means for generating a random amount of time when said transmission request occurs during a transmission inhibition period including a total of a data reception period and said time period; and control means for performing a first transmission process control such that data transmission associated with said transmission request waits until said random amount of time comes to an end, it is checked whether a predetermined channel for transmission is available at the end of said random amount of time, and said data transmission associated with said transmission request starts when said random amount of time has elapsed and said predetermined channel for transmission is available.

Claim 14

An access control system of a wireless terminal in a wireless network employing a carrier sense multiple access (CSMA) scheme, said system comprising: first monitoring means for monitoring the termination of data reception; second monitoring means for monitoring the occurrence of a transmission request; first generating means for generating a time period when said data reception is terminated, said time period starting from said termination of said data reception, and said time period being predetermined depending on said wireless network; second generating means for generating a random amount of time when said transmission request occurs during a transmission inhibition period including a total of a data reception period and said time period; and control means for performing a first transmission process control such that data transmission associated with said transmission request waits until said random amount of time comes to an end, it is checked whether a predetermined channel for transmission is available at the end of said random amount of time, and said data transmission associated with said transmission request starts when said random amount of time has elapsed and said predetermined channel for transmission is available.

Claim 15

The system according to claim 10, wherein said time period is determined by an interframe spacing (IFS) period for spacing between data frames, and said random amount of time is determined by a predetermined backoff processing procedure.

Claim 16

The system according to claim 11, wherein said wireless network employs a carrier sense multiple access with collision detection (CSMA/CD) scheme.

Claim 17

The system according to claim 10, wherein said control means further performs a second transmission process control such that said first transmission process control is repeated while said predetermined channel for transmission is not available until the repetition number reaches a predetermined maximum value, and said data transmission is stopped when said predetermined channel for transmission is not available with the repetition number exceeding said predetermined maximum value.

Claim 18

A terminal in a wireless local-area network (LAN), said terminal comprising: a wireless transmitting-receiving system having a channel monitoring function; a wired-LAN controller incorporating a carrier sense multiple access with collision detection (CSMA/CD) scheme; and an access controller intervening between said wireless transmitting-receiving system and said wired-LAN controller, said access controller comprising: first monitoring means for monitoring the termination of data reception; second monitoring means for monitoring the occurrence of a transmission request; first generating means for generating a time period when said data reception is terminated, said time period starting from said termination of said data reception, and said time period being predetermined depending on said wireless network; second generating means for generating a random amount of time when said transmission request occurs during a transmission inhibition period including a total of a data reception period and said time period; and control means for performing a first transmission process control such that data transmission associated with said transmission request waits until said random amount of time comes to an end, it checks whether a predetermined channel for transmission is available at the end of said random amount of time, and said data transmission associated with said transmission request starts when said random amount of time has elapsed and said predetermined channel for transmission is available.

Claim 19

A terminal in a wireless local-area network (LAN), said terminal comprising: a wireless transmitting-receiving system having a channel monitoring function; a wired-LAN controller incorporating a carrier sense multiple access with collision detection (CSMA/CD) scheme; and an access controller intervening between said wireless transmitting-receiving system and said wired-LAN controller, said access controller comprising: first monitoring means for monitoring the termination of data reception; second monitoring means for monitoring the occurrence of a transmission request; first generating means for generating a time period when said data reception is terminated, said time period starting from said termination of said data reception, and said time period being predetermined depending on said wireless network; second generating means for generating a random amount of time when said transmission request occurs during a transmission inhibition period including a total of a data reception period and said time period; and control means for performing a first transmission process control such that data transmission associated with said transmission request waits until said random amount of time comes to an end, it checks whether a predetermined channel for transmission is available at the end of said random amount of time, and said data transmission associated with said transmission request starts when said random amount of time has elapsed and said predetermined channel for transmission is available.

Claim 20

The terminal according to claim 14, wherein said time period is determined by an interframe spacing (IFS) period for spacing between data frames, and said random amount of time is determined by a predetermined backoff processing procedure.

Claim 21

The terminal according to claim 14, wherein said control means further performs a second transmission process control such that said first transmission control is repeated while said predetermined channel for transmission is not available until the repetition number reaches a predetermined maximum value, and said data transmission is stopped when said predetermined channel for transmission is not available with the repetition number exceeding said predetermined maximum value.

Claim 22

A terminal in a wireless local-area network (LAN), said terminal comprising: a wireless transmitting-receiving system having a channel monitoring function; a wired-LAN controller incorporating a carrier sense multiple access with collision detection (CSMA/CD) scheme; and an access controller intervening between said wireless transmitting-receiving system and said wired-LAN controller, said access controller comprising: a delay timer generating a time period when data reception is terminated, said time period starting from said termination of said data reception, and said time period being predetermined depending on said wireless LAN network; a backoff processor generating a random amount of time when a transmission request is received from said wired-LAN controller during a transmission inhibition period including a total of a data reception period and said time period; and a transmission process controller performing a first transmission process control such that data transmission associated with said transmission request waits until said random amount of time comes to an end, it is checked whether a predetermined channel for transmission is available at the end of said random amount of time, and said data transmission associated with said transmission request starts when said random amount of time has elapsed and said predetermined channel for transmission is available.

Claim 23

A terminal in a wireless local-area network (LAN), said terminal comprising: a wireless transmitting-receiving system having a channel monitoring function; a wired-LAN controller incorporating a carrier sense multiple access with collision detection (CSMA/CD) scheme; and an access controller intervening between said wireless transmitting-receiving system and said wired-LAN controller, said access controller comprising: a delay timer generating a time period when data reception is terminated, said time period starting from said termination of said data reception, and said time period being predetermined depending on said wireless LAN network; a backoff processor generating a random amount of time when a transmission request is received from said wired-LAN controller during a transmission inhibition period including a total of a data reception period and said time period; and a transmission process controller performing a first transmission process control such that data transmission associated with said transmission request waits until said random amount of time comes to an end, it is checked whether a predetermined channel for transmission is available at the end of said random amount of time, and said data transmission associated with said transmission request starts when said random amount of time has elapsed and said predetermined channel for transmission is available.

Claim 24

The terminal according to claim 17, wherein said time period is determined by an interframe spacing (IFS) period for spacing between data frames.

Claim 25

The terminal according to claim 17, wherein said transmission process controller further performs a second transmission process control such that said first transmission control is repeated while said predetermined channel for transmission is not available until the repetition number reaches a predetermined maximum value, and said data transmission is stopped when said predetermined channel for transmission is not available with the repetition number exceeding said predetermined maximum value.