Method and apparatus of hybrid burst mapping in ofdma systems

H - Electricity – 04 – L

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H04L 27/26 (2006.01)

Patent

CA 2689496

Provided are a method of adaptively allocating appropriate hybrid bursts according to terminal attributes including terminal position, channel state, and service type in an orthogonal frequency-division multiple access (OFDMA) system, and an upstream-MAP information element (US-MAP IE) structure supporting the method. The method includes dividing an upstream subframe into a plurality of zones depending on the number of OFDMA symbols and allocating bursts of a zone to a terminal according to the terminal attributes. Bursts are formed by allocating slots along a time axis in the upstream subframe, and are formed by allocating slots along a frequency axis in a downstream subframe.

La présente invention concerne un procédé permettant d'établir de façon adaptative les correspondances pour les rafales appropriées en tenant compte des attributs des terminaux, et notamment de la position du terminal, de l'état du canal et le type de service dans un système OFDMA (Orthogonal Frequency-Division Multiple Access). L'invention concerne également une structure US-MAP IE (UpStream-MAP Information Element), c'est-à-dire un élément d'information du protocole d'accès aux supports de flux ascendant, laquelle structure permet l'exploitation du procédé. En l'occurrence, le procédé consiste à diviser une sous-trame de flux ascendant en une pluralité de zones en fonction du nombre de symboles OFDMA et à affecter des rafales d'une zone à un terminal en tenant compte des attributs du terminal. Pour constituer les rafales, on affecte chronologiquement des créneaux de temps dans la sous-trame du flux ascendant, puis on affecte des créneaux dans un axe des fréquences dans uns sous-trame de flux descendant.

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