Interference management for distributed antenna systems
First Claim
1. A central base station for interference management in a distributed antenna system which includes a plurality of users and a plurality of remote radio heads, the central base station comprising:
- a processor;
a memory;
a frequency partition module configured to divide the remote radio heads into clusters and allocate a frequency band to each cluster so that remote radio heads in each cluster have the same frequency band,wherein multiple clusters use the same frequency band and groups of clusters are formed, each group of clusters using the same frequency band;
a joint scheduler configured, for each group, to activate at most two clusters at any given time and deactivate remaining clusters in the group, one of the at most two activated clusters being a serving cluster of the group, and to associate one or more users with the serving cluster in the group; and
an interference alignment module configured to apply downlink interference alignment between the at most two activated clusters in each group to align transmit directions of all interferences between the at most two activated clusters.
1 Assignment
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Accused Products
Abstract
A central base station for interference management in a distributed antenna system comprises a processor; a memory; and a frequency partition module configured to divide the remote radio heads into clusters and allocate a frequency band to each cluster. Multiple clusters use the same frequency band and groups of clusters are formed. A joint scheduler is configured, for each group, to activate at most two clusters at any given time and deactivate remaining clusters in the group, one of the at most two activated clusters being a serving cluster of the group, and to associate one or more users with the serving cluster in the group. An interference alignment module is configured to apply downlink interference alignment between the at most two activated clusters in each group to align transmit directions of all interferences between the at most two activated clusters.
40 Citations
20 Claims
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1. A central base station for interference management in a distributed antenna system which includes a plurality of users and a plurality of remote radio heads, the central base station comprising:
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a processor; a memory; a frequency partition module configured to divide the remote radio heads into clusters and allocate a frequency band to each cluster so that remote radio heads in each cluster have the same frequency band, wherein multiple clusters use the same frequency band and groups of clusters are formed, each group of clusters using the same frequency band; a joint scheduler configured, for each group, to activate at most two clusters at any given time and deactivate remaining clusters in the group, one of the at most two activated clusters being a serving cluster of the group, and to associate one or more users with the serving cluster in the group; and an interference alignment module configured to apply downlink interference alignment between the at most two activated clusters in each group to align transmit directions of all interferences between the at most two activated clusters. - View Dependent Claims (2, 3, 4, 5)
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6. A method for interference management in a distributed antenna system which includes a central base station, a plurality of users, and a plurality of remote radio heads, the method comprising:
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dividing the remote radio heads into clusters; allocating a frequency band to each cluster so that remote radio heads in each cluster have the same frequency band, wherein multiple clusters use the same frequency band and groups of clusters are formed, each group of clusters using the same frequency band; activating at most two clusters at any given time and deactivating remaining clusters in each group, one of the at most two activated clusters being a serving cluster of the group; associating one or more users with the serving cluster in the group; and applying downlink interference alignment between the at most two activated clusters in each group to align transmit directions of all interferences between the at most two activated clusters. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A distributed antenna system comprising a central base station, a plurality of users, and a plurality of remote radio heads, wherein the central base station includes:
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a processor; a memory; a frequency partition module configured to divide the remote radio heads into clusters and allocate a frequency band to each cluster so that remote radio heads in each cluster have the same frequency band, wherein multiple clusters use the same frequency band and groups of clusters are formed, each group of clusters using the same frequency band; a joint scheduler configured, for each group, to activate at most two clusters at any given time and deactivate remaining clusters in the group, one of the at most two activated clusters being a serving cluster of the group, and to associate one or more users with the serving cluster in the group; and an interference alignment module configured to apply downlink interference alignment between the at most two activated clusters in each group to align transmit directions of all interferences between the at most two activated clusters. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification