Discontinuous transmission (dtx) frame detection in wireless...

H - Electricity – 04 – W

Patent

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H04W 28/04 (2009.01) H04L 1/20 (2006.01)

Patent

CA 2508869

Techniques to detect for DTX frames in a "primary" transmission that may be sent in a non-continuous manner using a "secondary" transmission that is sent during periods of no transmission for the primary transmission. The primary and secondary transmissions may be the ones sent on the F-DCCH and Forward Power Control Subchannel, respectively, in an IS-2000 system. In one method, a determination is first made whether or not a frame received for the primary transmission in a particular frame interval is a good frame (e.g., based on CRC). If the received frame is not a good frame, then a determination is next made whether the received frame is a DTX frame or an erased frame based on a number of metrics determined for the primary and secondary transmissions. The metrics may include symbol error rate of the received frame, secondary transmission (e.g., PC bit) energy, and received frame energy.

L'invention concerne des techniques de détection de trames de DTX dans une transmission "primaire" qui peut être envoyée de manière discontinue à l'aide d'une transmission "secondaire" qui est envoyée au cours de périodes de non transmission de la transmission primaire. Les transmissions primaire et secondaire peuvent être celles envoyées sur le F-DCCH et sur le sous-canal de commande de puissance aller, respectivement, dans un système IS-2000. Selon un procédé, on détermine tout d'abord si une trame reçue pour la transmission primaire dans un intervalle de trame particulier est une bonne trame (par exemple, en fonction d'un CRC). Si la trame reçue n'est pas une bonne trame, on détermine alors si la trame reçue est une trame de DTX ou une trame effacée en fonction d'un certain nombre de mesures déterminées pour les transmissions primaire et secondaire. Les mesures peuvent comprendre un taux d'erreur de symbole de la trame reçue, une énergie (par exemple, binaire PC) de transmission secondaire et une énergie de trame reçue.

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