Distributed Base Station with Frequency Domain Interface on Which Signal Subspace Varies According to Frequency Bin
AssigneeNokia Solutions and Networks Oy
InventorsOlli Juhani PIIRAINEN, Shirish NAGARAJ
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Abstract
A method and apparatus are disclosed for determining a signal subspace in a communications system. A remote apparatus obtains signal streams from antenna elements or signal streams from antenna beams. Based on the obtained signal streams, the apparatus selects a signal subspace for a user, the signal subspace having a dimension M. Based on the selected signal subspace, the apparatus transmits, via an interface to a central apparatus, M streams of post-fast-Fourier-transform data, the interface being capable of transmitting a different subspace for different frequency bins.
Claims19
A method, the method comprising
- obtaining, in a remote apparatus, a plurality of N signal streams either from a plurality of antenna elements or from a plurality of antenna beams;
- based on the obtained N signal streams, determining post-fast-Fourier-transform data comprising data that is divided to individual samples, the individual samples comprising information on each of a plurality of users;
- selecting from the post-fast-Fourier transform data a signal sub-space for a selected user of the plurality of users, the signal subspace having a plurality of M streams, where M is different from and less than N;
- and
- based on the selected signal subspace, transmitting, via an interface to a central apparatus, the M streams of post-fast-Fourier-transform data that correspond to the selected user.
An apparatus comprising at least one processor;
- and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to
- obtain, in a remote apparatus, a plurality of N signal streams, the N signal streams either from a plurality of antenna elements or from a plurality of antenna beams;
- based on the obtained N signal streams, determine post-fast-Fourier-transform data comprising data that is divided to individual samples, the individual samples comprising information on each of a plurality of users;
- select from the post-fast-Fourier transform data a signal subspace for a selected user of the plurality of users, the signal subspace having a plurality of M streams, where M is different from and less than N;
- and
- based on the selected signal subspace, transmit, via an interface to a central apparatus, the M streams of the post-fast-Fourier-transform data that correspond to the selected user.
A computer program product comprising a non-transitory computer-readable medium comprising executable code that, when executed, causes execution by an apparatus of operations comprising:
- obtaining, in a remote apparatus, a plurality of N signal streams, the N signal streams either from a plurality of antenna elements or from a plurality of antenna beams;
- based on the obtained N signal streams, determining post-fast-Fourier-transform data comprising data that is divided to individual samples, the individual samples comprising information on each of a plurality of users;
- selecting from the post-fast-Fourier transform data a signal sub-space for a selected user of the plurality of users, the signal subspace having a plurality of M streams, where M is different from and less than N;
- and
- based on the selected signal subspace, transmitting, via an interface to a central apparatus, the M streams of the post-fast-Fourier-transform data that correspond to the selected user.
Dependencies are inferred from the claim text.