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US 8,798,653 B2Granted
Probabilistic interference mitigation for wireless cellular networks
AssigneeIntel Corporation
InventorsGuowang Miao, Nageen Himayat, Shilpa Talwar
Life of this patent
Estimating the term…
Abstract
An interference mitigation system randomizes transmissions to cell-edge users by carefully controlling the probability of transmission to these users, thereby creating a virtual fractional frequency system that does not require extensive frequency management and coordination across the network. In some embodiments, the interference mitigation system identifies severely interfered links and reduces the probability of transmission on these links, with the result being a reduced probability of interference.
Claims10
A system, comprising:
- a serving base station comprising a co-channel interference avoidance medium access controller (CIA MAC), the CIA MAC comprising transmission randomization capability;
- a feedback link between the serving base station and a subscriber station, wherein an interference report is received by the serving base station on the feedback link when an interference-to-carrier ratio exceeds a predetermined threshold;
- and
- an interference reporting link between the serving base station and a second base station, the serving base station and the second base station further comprising physical layer optimization, wherein the base stations determine power allocation and rate parameters for a link between the base station and the subscriber station and the serving base station sends the interference report over the interference link to the second base station;
- wherein transmissions to the subscriber station are randomized based on a channel threshold for the subscriber station, and the power allocation is calculated in the CIA MAC of the serving base station, wherein the power allocation calculation is given by:
- if
- P
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- for
-
-
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- H
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- ,
- otherwise,
- P
- (
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-
- (
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- =
- {
- P
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- (
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-
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- 0
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-
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- otherwise
- ,
- where h≧ H*(i,j)k• R′−1( ) is an inverse function of R′( ), and υ*≧0 is uniquely given by
- ∫
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174 more elements
A method, comprising:
- receiving, by a serving base station, an indication of interference between a subscriber and a base station in a wireless neighborhood from the subscriber, wherein the subscriber, the base station, and the serving base station occupy a wireless neighborhood comprising a plurality of subscribers and a plurality of base stations;
- and
- randomizing, by the serving base station, transmissions to a link between the subscriber and the base station based on a channel threshold if an interference-to-carrier ratio of the link exceeds a predetermined threshold value
- wherein the channel threshold is obtained by executing the CIA MAC operating in the serving base station, wherein the CIA MAC utilizes the following optimization equation to obtain the channel threshold:
- H
- _
- *
- =
- arg
-
-
- max
- H
- _
-
- ∑
- ∀
- (
- i
- ,
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-
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- p
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-
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- ,
- wherein (i,j)k is the link between the ith base station and the jth subscriber on the kth channel, and p(i,j)k is the probability of transmission on link (i,j)k, and pl is the probability of transmission by the lth interfering base station.
47 more elements
A system, comprising:
- a serving base station comprising a co-channel interference avoidance medium access controller (CIA MAC), the CIA MAC comprising transmission randomization capability;
- a feedback link between the serving base station and a subscriber station, wherein an interference report is received by the serving base station on the feedback link when an interference-to-carrier ratio exceeds a predetermined threshold;
- and
- an interference reporting link between the serving base station and a second base station, wherein the serving base station sends the interference report over the interference link to the second base station;
- wherein transmissions to the subscriber station are randomized based on a channel threshold for the subscriber station;
- wherein the channel threshold is calculated in the CIA MAC of the serving base station, and is determined using an optimization equation:
- H
- _
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- H
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-
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- ,
- where (i,j)k is the link between the ith base station and the jth subscriber on the kth channel, and p(i,j)k is the probability of transmission on link (i,j)k, and pl is the probability of transmission by the lth interfering base station.
49 more elements
Dependencies are inferred from the claim text.