Virtual mimo communication system
First Claim
1. A method for facilitating cooperative uplink transmission comprising:
- a) identifying a group of mobile terminals to provide cooperative uplink transmissions;
b) assigning a common resource via downlink transmissions to each mobile terminal in the group of mobile terminals, such that the common resource for each mobile terminal is the same and used for uplink transmission; and
c) assigning a different unique resource via downlink transmissions to each mobile terminal, such that the unique resource for each of the mobile terminals is different and used for the uplink transmission, wherein each of the mobile terminals in the group of mobile terminals concurrently uses the common resource and a corresponding unique resource during the uplink transmissions to provide a virtual multiple input multiple output uplink transmission.
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Accused Products
Abstract
The present invention provides an effective way to create a virtual MIMO transmission system using mobile terminals that have only one transmit path and antenna. This is accomplished by assigning mobile terminals to a group and assigning certain shared resources and user-specific resources to those mobile terminals in the group. In a synchronized fashion, the mobile terminals will provide uplink transmission in concert, as if they were a single entity having multiple transmission paths and antennas. Preferably, the shared resources bear on how the data is transmitted, and the user-specific resources relate to pilot signals. The data transmitted may be encoded in any number of ways, and in one embodiment, the mobile terminals may relay their information to each other, such that uplink transmissions can incorporate STTD decoding or other space-time codes. The invention is applicable to virtually any multiple access technology, including OFDM, TDMA, and CDMA, preferably synchronous CDMA.
114 Citations
58 Claims
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1. A method for facilitating cooperative uplink transmission comprising:
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a) identifying a group of mobile terminals to provide cooperative uplink transmissions; b) assigning a common resource via downlink transmissions to each mobile terminal in the group of mobile terminals, such that the common resource for each mobile terminal is the same and used for uplink transmission; and c) assigning a different unique resource via downlink transmissions to each mobile terminal, such that the unique resource for each of the mobile terminals is different and used for the uplink transmission, wherein each of the mobile terminals in the group of mobile terminals concurrently uses the common resource and a corresponding unique resource during the uplink transmissions to provide a virtual multiple input multiple output uplink transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for facilitating cooperative uplink transmission comprising:
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a) receiving from a servicing base station a common resource to use for uplink transmission, the common resource also assigned to others of a group of mobile terminals; b) receiving from the servicing base station a unique resource to use for the uplink transmission, a different unique resource being assigned to the other mobile terminals in the group of mobile terminals; and c) transmitting information to the servicing base station using the common and unique resource wherein each of the mobile terminals in the group of mobile terminals concurrently uses the common resource and the different unique resource during the uplink transmission to provide a virtual multiple input multiple output uplink transmission. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A base station for facilitating cooperative uplink transmission comprising transmit, receive, and control logic cooperatively adapted to:
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a) identify a group of mobile terminals to provide cooperative uplink transmission; b) assign a common resource via downlink transmissions to each of the mobile terminals in the group of mobile terminals, such that the common resource for each mobile terminal is the same and used for uplink transmission; and c) assign a different unique resource via downlink transmissions to each mobile terminal, such that the unique resource for each of the mobile terminals is different and used for the uplink transmission, wherein each of the mobile terminals in the group of mobile terminals concurrently uses the common resource and a corresponding unique resource during the uplink transmission to provide a virtual multiple input multiple output uplink transmission. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A mobile terminal for facilitating cooperative uplink transmission comprising receive, transmit, and control logic adapted to:
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a) receive from a servicing base station a common resource to use for uplink transmission, the common resource also assigned to others mobile terminals in a group of mobile terminals; b) receive from the servicing base station a unique resource to use for the uplink transmission, a different unique resource being assigned to the each mobile terminal; and c) transmit information to the servicing base station using the common and unique resources wherein each of the mobile terminals in the group of mobile terminals concurrently uses the common resource and the different unique resource during the uplink transmission to provide a virtual multiple input multiple output uplink transmission. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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Specification