Method to gain access to a base station in a discrete...

Details Method to gain access to a base station in a discrete... Method to gain access to a base station in a discrete...

H - Electricity

04

B

H04B 1/66 (2006.01) H04B 7/26 (2006.01) H04L 1/00 (2006.01) H04L 1/16 (2006.01) H04L 1/18 (2006.01) H04B 1/69 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2281818

In a discrete multitone spread spectrum system, a base station distinguishes between normal collisions and noise bursts when receiving access request signals for remote units on a common access channel. The base station is then able to reply to the remote units with information about the quality of the common access channel and why their transmissions where not successful. The remote units then use this information to adapt their retry processes to the channel's quality, depending on whether there was a noise burst, a normal collision, or a successful transmission on the channel.

L'invention concerne un système à étalement du spectre et à tonalités multiples discrètes, dans lequel une station de base fait la distinction entre des collisions normales et des rafales de bruit lorsqu'elle reçoit des signaux de demande d'accès provenant d'unités à distance dans un canal à accès commun. La station de base est alors capable de répondre aux unités à distance, et de leur fournir des informations sur la qualité du canal à accès commun et sur les raisons de l'échec de leurs transmissions. Les unités à distance peuvent alors utiliser ces informations pour adapter leurs tentatives de relance à la qualité du canal, selon qu'il y avait une rafale de bruit, une collision normale ou une transmission normale sur le canal.

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