MULTI-SITE MIMO COOPERATION IN CELLULAR NETWORKS
First Claim
1. In a cellular communications network comprising a plurality of transmitting sites wherein each transmitting site comprises at least one antenna, a method of serving a given data stream to a target mobile terminal, comprising:
- designating at least two of said plurality of transmitting sites as cooperating sites;
assigning tones to each transmitting site from a sub-band associated with the cooperating sites;
dividing said data stream into at least two sub-data streams, each of said sub-data streams for transmission over selected tones; and
interlacing tones of said cooperating sites in accordance with a selected one of a time switching and a frequency switching transmit diversity technique.
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Accused Products
Abstract
A method of serving a given data stream to a target mobile terminal, in a cellular communications network that includes a plurality of transmitting sites wherein each transmitting site including at least one antenna, is provided. The method includes designating at least two of the plurality of transmitting sites as cooperating sites; assigning tones to each transmitting site from a sub-band associated with the cooperating sites; dividing the data stream into at least two sub-data streams, each of the sub-data streams for transmission over selected tones; and interlacing tones of the cooperating sites in accordance with a selected one of a time switching and a frequency switching transmit diversity technique. Other techniques for multi-site MIMO cooperation are also provided.
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Citations
28 Claims
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1. In a cellular communications network comprising a plurality of transmitting sites wherein each transmitting site comprises at least one antenna, a method of serving a given data stream to a target mobile terminal, comprising:
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designating at least two of said plurality of transmitting sites as cooperating sites; assigning tones to each transmitting site from a sub-band associated with the cooperating sites; dividing said data stream into at least two sub-data streams, each of said sub-data streams for transmission over selected tones; and interlacing tones of said cooperating sites in accordance with a selected one of a time switching and a frequency switching transmit diversity technique. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a cellular communications network comprising a plurality of transmitting sites, a method of serving a data stream to a target mobile terminal, comprising:
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designating a first transmitting site and a second transmitting site as cooperating sites; at said first transmitting site, transmitting said data stream to said mobile terminal in accordance with a beamforming technique; and at said second transmitting site, transmitting said data stream to said mobile terminal in accordance with a beamforming technique wherein said beam transmitted by said second transmitting site is adjusted to result in constructive addition of beams arriving at said target mobile terminal from said first and said second transmitting sites. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. In a cellular communications network comprising a plurality of transmitting sites, a method of serving a target mobile terminal, comprising:
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designating at least two of said plurality of transmitting sites as a cooperating site; designating one transmitting site of said cooperating site as a serving site; designating a non-serving transmitting site as a phase reference site; assigning a fixed precoder to said phase reference site; only at said serving site, receiving an indicator of a precoder for phase correction; and encoding transmissions to said target mobile device using said indicated precoder. - View Dependent Claims (20, 21, 22, 23)
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24. In a cellular communications network comprising a plurality of transmitting sites, a method of serving a target mobile terminal, comprising:
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designating two unique subsets of transmitting sites as a first and second cooperating site; employing closed loop techniques within each cooperating site; and employing open loop cooperation techniques between cooperating sites. - View Dependent Claims (25, 26, 27, 28)
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Specification