Wireless access system and transmission method
AssigneeAlcatel Lucent
InventorJoerg Schaepperle
Life of this patent
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Abstract
The present invention relates to the field of wireless access systems and more particularly to a broadband wireless access system and a transmission method for such system. At least two data streams (2, 3, 4) are simultaneously transmitted in a multi-user channel (1) having a location dependent capacity. The data streams (2, 3, 4) are transmitted on the same radio resources. Preferably, the data streams are combined in a transmitter and separated in a receiver using different modulation and/or coding for the data streams.
Claims18
A method for transmission in a wireless access system, comprising:
- transmitting a first data stream from a base station to a first user terminal in a frequency band and a time slot of a multi-user channel at a power level using a modulation and a coding;
- and
- transmitting a second data stream from the base station to a plurality of user terminals in the multi-user channel, wherein the second data stream is transmitted in the same frequency band and time slot as the first data stream, wherein the second data stream is transmitted with at least one of the power level, modulation, and coding being different from the power level, modulation, and coding for the first data stream;
- wherein the different power level, modulation, and/or coding facilitate separation of said first data stream from the combined first and second data streams by the first user terminal;
- wherein the first data stream includes unicast information for the first user terminal and the second data stream includes broadcast or multi-cast information for the plurality of user terminals, the broadcast or multi-cast information and the unicast information forming a complete information.
A method for assigning a radio resource to multiple user terminals, comprising:
- assigning radio resources in a multi-user channel and signal parameters for transmission of a first data stream from a base station to a first user terminal;
- assigning radio resources in the multi-user channel and signal parameters for transmission of a second data stream from the base station to plurality of user terminals, wherein the radio resources include a frequency band and a time slot, wherein the frequency band and time slot assigned for transmission of the second data stream are the same as the frequency band and time slot assigned for transmission of the first data stream, wherein the signal parameters include a power level, a modulation, and a coding, wherein at least one of the power level, modulation, and coding assigned for transmission of the second data stream are different from the power level, modulation, and coding assigned for transmission of the first data stream;
- wherein the different power level, modulation, and/or coding facilitate separation of said first data stream from the combined first and second data streams;
- by the first user terminal;
- wherein the first data stream includes first unicast information for the first user terminal and the second data stream includes broadcast or multi-cast information for the plurality of user terminals, the broadcast or multi-cast information and the unicast information forming a complete information.
Dependencies are inferred from the claim text.