Soft handoff with interference cancellation in a wireless...

H - Electricity – 04 – W

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H04W 88/08 (2009.01) H04W 88/02 (2009.01) H04J 11/00 (2006.01) H04W 36/18 (2009.01)

Patent

CA 2526910

Techniques are provided to support soft handoff in a frequency hopping OFDMA system. Each sector concurrently supports "non-handoff" users and "soft- handoff" users. A non-handoff user communicates with only one sector, and a soft-handoff user communicates with multiple sectors simultaneously. Non- handoff users are assigned traffic channels by their sole sectors, and soft- handoff users are assigned traffic channels by their "serving" sectors. For each sector, the traffic channels assigned to the non-handoff users are orthogonal to one another and may or may not be orthogonal to the traffic channels assigned to the soft-handoff users. Each sector processes its received signal and recovers the data transmissions from the non-handoff users of that sector. Each sector then estimates the interference due to the non- handoff users and cancels the interference from the received signal. Each sector further processes its interference-canceled signal to recover the data transmissions from the soft-handoff users.

L'invention concerne des techniques de mise en oeuvre de transfert souple dans un système à accès multiple par répartition en fréquence orthogonal (OFDMA). Chaque secteur assure conjointement les opérations <= sans transfert >= et les opérations à <= transfert souple >=. Un usager sans transfert communique avec un seul secteur, et un usager à transfert souple communique simultanément avec plusieurs secteurs. Les usagers sans transfert reçoivent des canaux de trafic de la part de leurs seuls secteurs, et les autres reçoivent les leurs par des secteurs de <= desserte >=. Pour chaque secteur, les canaux attribués aux usagers sans transfert sont mutuellement orthogonaux, pouvant être orthogonaux et pouvant ne pas l'être par rapport aux canaux attribués aux usagers à transfert souple. Chaque secteur traite son signal reçu et récupère les transmissions de données depuis les usagers sans transfert de ce secteur : Ensuite, chaque secteur estime le brouillage imputable aux usagers sans transfert et annule le brouillage provenant du signal reçu. Enfin, chaque secteur traite son signal à brouillage annulé pour récupérer les transmissions de données depuis les usagers à transfert souple.

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