Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

1. EP2079192 - DISPOSITIF DE COMMUNICATION DE RÉSEAU LOCAL SANS FIL ET PROCÉDÉ DE TRANSMISSION DE BALISE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
Claims

1. A wireless local area network communication apparatus comprising:

a receiving section that receives a beacon, the beacon including first transmission period information comprising information about a beacon transmission period at another communication apparatus and second transmission period information comprising information about a transmission period of a delivery traffic indication message beacon at the another communication apparatus, the delivery traffic indication message beacon including information indicating that packet data that has been waiting to be transmitted is transmitted;

a beacon detection section that detects the beacon received in the receiving section in a predetermined time immediately before or after a beacon of the wireless local area network communication apparatus is transmitted;

a beacon correction section that corrects a transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus based on the first transmission period information and the second transmission period information included in the detected beacon; and

a transmitting section that transmits the delivery traffic indication message beacon at the corrected transmission period and transmits the packet data immediately after having transmitted the delivery traffic indication message beacon.


  2. The wireless local area network communication apparatus according to claim 1, wherein, when a transmission period of the second transmission period information and the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus match and a transmission period of the first transmission period information and the transmission period of the beacon of the wireless local area network communication apparatus match, the beacon correction section corrects the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus such that the transmission period of the second transmission period information and the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus do not match.
  3. The wireless local area network communication apparatus according to claim 1, wherein:

the transmitting section transmits a beacon at a certain period; and

when a next beacon to be transmitted by the transmitting section is the delivery traffic indication message beacon, the beacon correction section transmits at least one extra beacon other than the delivery traffic indication message beacon before transmitting the delivery traffic indication message beacon to thereby correct the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus.


  4. The wireless local area network communication apparatus according to claim 1, further comprising a measuring section that measures the number of times beacons are detected in the beacon detection section,
wherein the beacon correction section corrects the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus when the number of times measured by the beacon measuring section is equal to or greater than a threshold.
  5. The wireless local area network communication apparatus according to claim 4, wherein:

the beacon detection section detects beacons received in the receiving section both in a pre-transmiss ion monitoring time which is a predetermined time immediately before the beacon of the wireless local area network communication apparatus is transmitted and in a post-transmission monitoring time which is a predetermined time immediately after the beacon of the wireless local area network communication apparatus is transmitted;

the measuring section measures the number of times beacons are detected in the beacon detection section separately between when a beacon received in the receiving section is detected in the pre-transmission monitoring time and when a beacon received in the receiving section is detected in the post-transmission monitoring time; and

when one of the numbers of times beacons are detected in the pre-transmission monitoring time and the number of times beacons are detected in the post-transmission monitoring time is equal to or greater than a threshold, the beacon correction section corrects the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus.


  6. The wireless local area network communication apparatus according to claim 5, wherein:

the beacon correction section sets the threshold to be compared with the measured number of times beacons are detected in the pre-transmission monitoring time and the threshold to be compared with the measured number of times beacons are detected in the post-transmission monitoring time to different values.


  7. A wireless local area network communication apparatus comprising:

a receiving section that receives a delivery traffic indication message beacon, the beacon including information indicating that packet data that has been waiting to be transmitted is transmitted;

a beacon detection section that detects the beacon received in the receiving section in a predetermined time immediately before or after the beacon of the wireless local area network communication apparatus is transmitted;
a beacon correction section that corrects the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus when the detection section detects reception of the beacon; and

a transmitting section that transmits the delivery traffic indication message beacon at the corrected transmission period and transmits the packet data immediatelyafterhavingtransmittedthedeliverytraffic indication message beacon.


  8. The wireless local area network communication apparatus according to claim 7, wherein the beacon correction section corrects the transmission period to a transmission period calculated by dividing the transmission period before the correction by a value obtained by adding "1" to the number of other stations that have transmitted beacons detected by the beacon detection section.
  9. The wireless local area network communication apparatus according to claim 7, wherein the beacon correction section resumes the transmission period before the correction when the next beacon of the wireless local area network communication apparatus is transmitted after one beacon of the wireless local area network communication apparatus is transmitted at the corrected transmission period.
  10. The wireless local area network communication apparatus according to claim 7, wherein the beacon correction section corrects the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus so as to be a predetermined time longer than before the correction.
  11. The wireless local area network communication apparatus according to claim 10, wherein the beacon correction section corrects the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus so as to be longer than before the correction by adding a time half the transmission period at the another communication apparatus of the beacon detected by the detection section to the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus before the correction.
  12. A beacon transmission method comprising the steps of:

receiving a beacon including first transmission period information comprising information about a beacon transmission period at another communication apparatus and second transmission period information comprising information about a transmission period of a delivery traffic indication message beacon at the another communication apparatus, the delivery traffic indication message beacon including information indicating that packet data that has been waiting to be transmitted is transmitted;

detecting a beacon received in a predetermined time immediately before or after the beacon of the wireless local area network communication apparatus is transmitted;

correcting a transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus based on the first transmission period information and the second transmission period information included in the detected beacon; and

transmitting the delivery traffic indication message beacon at the corrected transmission period.


  13. A beacon transmission method comprising the steps of:

receiving a delivery traffic indication message beacon including information indicating that packet data that has been waiting to be transmitted is transmitted;

detecting a beacon received in a predetermined time immediately before or after the beacon of the wireless local area network communication apparatus is transmitted;

correcting the transmission period of the delivery traffic indication message beacon at the wireless local area network communication apparatus when the reception of the beacon is detected; and

transmitting the delivery traffic indication message beacon at the corrected transmission period.