Channel allocation in broadband orthogonal frequency-division multiple-access/space-division multiple-access networks
DC CAFC
First Claim
Patent Images
1. A network comprising:
- a base station; and
a plurality of subscriber units to communicate with the base station using an orthogonal frequency-division multiple-access (OFDMA) protocol;
the base station including a memory to store broadband spatial signature vectors associated with each subscriber, the vectors being a function of frequency; and
traffic channel allocation logic to allocate OFDMA channels using the broadband spatial signature vectors of the subscribers.
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Abstract
A network is described. In one embodiment, the network comprises multiple subscriber units to communicate with the base station using an orthogonal frequency-division multiple-access (OFDMA) protocol, and a base station. The base-station includes a memory unit to store broadband spatial signature vectors associated with each subscriber and traffic channel allocation logic. The vectors are a function of frequency. The traffic channel allocation logic allocates OFDMA channels using the broadband spatial signature vectors of the subscribers.
317 Citations
42 Claims
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1. A network comprising:
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a base station; and
a plurality of subscriber units to communicate with the base station using an orthogonal frequency-division multiple-access (OFDMA) protocol;
the base station including a memory to store broadband spatial signature vectors associated with each subscriber, the vectors being a function of frequency; and
traffic channel allocation logic to allocate OFDMA channels using the broadband spatial signature vectors of the subscribers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 34)
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14. A method comprising:
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determining frequency and spatial characteristics of a plurality of orthogonal frequency division multiple access (OFDMA) channels for a new subscriber and one or more subscribers with on-going traffic;
allocating a subscriber one or more OFDMA channels based on 2-D spatial signature vectors of the new subscriber and other subscribers with on-going traffic and data rates of on-going traffic. - View Dependent Claims (15)
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16. A method comprising:
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estimating spatial and frequency characteristics of propagation channels using an FFT-based or parametric channel estimation algorithm between a base station and a new subscriber;
accommodating a rate request of the new subscriber by assigning OFDMA traffic channels that use a first amount of transmission power and cause a second amount of interference to co-channel subscribers. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of assigning orthogonal frequency-division multiple-access (OFDMA) traffic channels in conjunction with a space-division multiple access (SDMA) protocol comprising:
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estimating broadband spatial and frequency channel characteristics of a requesting subscriber;
determining, for each of the OFDMA traffic channel, an achievable rate of the requesting subscriber over each of the OFDMA traffic channels;
calculating, for each of the OFDMA traffic channel, a new achievable rate of at least one other subscriber with on-going traffic on one or more of the OFDMA traffic channels if the at least one other subscriber is to share the one or more OFDMA traffic channels with the requesting subscriber;
determining candidate traffic channels; and
allocating candidate traffic channels to the requesting subscriber unit to satisfy the requested data rate. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A base station comprising:
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a plurality of receiving antennas;
a plurality of down converters coupled to the plurality of receiving antennas;
a new accessing subscriber spatial signature register;
an on-going traffic spatial signature register; and
an OFDMA traffic channel allocator coupled to the new accessing subscriber spatial signature register and the on-going traffic spatial signature register. - View Dependent Claims (32, 33)
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35. A base station comprising:
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a plurality of receiving antennas;
a plurality of down converters coupled to the plurality of receiving antennas;
a new accessing subscriber spatial signature register;
an on-going traffic spatial signature register; and
an OFDMA traffic channel allocator coupled to the new accessing subscriber spatial signature register and the on-going traffic spatial signature register, wherein the channel allocator comprises a first input for a two-dimensional (2-D) spatial signature of an accessing subscriber;
a second input for a requested data rate of the accessing subscriber;
a third input for data rates of on-going traffic in each of the plurality of OFDMA channels;
a fourth input for 2-D spatial signatures of on-going subscribers;
achievable rate calculation logic coupled to the first, second, third, and fourth inputs to calculate an achievable rate for the accessing subscriber over each of the OFDMA channels and calculates updated achievable rates of subscribers at each of the OFDMA channels with on-going traffic as if the accessing subscriber is added to said each of the OFDMA channels; and
channel selection logic coupled to the achievable rate calculation logic to select OFDMA channels, based on achievable rates, for use by the accessing subscriber to achieve the requested data rate. - View Dependent Claims (36, 38)
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37. A base station comprising:
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a plurality of receiving antennas;
a plurality of down converters coupled to the plurality of receiving antennas;
a new accessing subscriber spatial signature register;
an on-going traffic spatial signature register; and
an OFDMA traffic channel allocator coupled to the new accessing subscriber spatial signature resister and the on-going traffic spatial signature register, wherein the channel allocator comprises a first input for a two-dimensional (2-D) spatial signature of an accessing subscriber;
a second input for a requested data rate of the accessing subscriber;
a third input for data rates of on-going traffic in each of the plurality of OFDMA channels;
a fourth input for 2-D spatial signatures of on-going subscribers;
calculation logic coupled to the first, second, third, and fourth inputs to calculate signal-plus-interference to noise ratio (SINRs) for the accessing subscriber over each of the OFDMA channels and calculates updated SINRs of subscribers at each of the OFDMA channels with on-going traffic as if the accessing subscriber is added to said each of the OFDMA channels; and
channel selection logic coupled to the calculation logic to select OFDMA channels, based on SINRs, for use by the accessing subscriber.
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39. A method comprising:
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determining frequency and spatial characteristics of a plurality of orthogonal frequency division multiple access (OFDMA) channels for a new subscriber and one or more subscribers with on-going traffic;
allocating a subscriber one or more OFDMA channels based on on-going traffic among the OFDMA channels, including selecting OFDMA channels, in response to 2-D spatial signatures of the new subscriber and one or more subscribers with on-going traffic and data rates of on-going traffic, based on calculated achievable rates for the new subscriber to achieve a requested data rate and for the one or more subscribers at each of the OFDMA channels. - View Dependent Claims (40)
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41. A method comprising:
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determining frequency and spatial characteristics of a plurality of orthogonal frequency division multiple access (OFDMA) channels for a new subscriber and one or more subscribers with on-going traffic;
allocating a subscriber one or more OFDMA channels based on on-going traffic among the OFDMA channels, including selecting OFDMA channels, in response to 2-D spatial signatures of the new subscriber and one or more subscribers with on-going traffic and data rates of on-going traffic, based on SINRs, for use by the new subscriber. - View Dependent Claims (42)
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Specification
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Litigation Data
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Current AssigneeAdaptix, Inc. (Acacia Research Corporation)
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Original AssigneeAdaptix, Inc. (Acacia Research Corporation)
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InventorsLiu, Hui, Yin, Hujun, Li, Xiaodong, Mu, Fuqi
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Primary Examiner(s)HSU, ALPUS
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Application NumberUS09/692,681Time in Patent Office1,616 DaysField of Search370/203, 370/206, 370/208, 370/210, 370/252, 370/319, 370/328, 370/329, 370/343, 370/344, 370/480, 370/485, 370/330, 375/260, 375/261, 375/267, 375/299, 375/347, 455/450, 455/507, 455/509, 455/517US Class Current370/203CPC Class CodesH04L 5/023 Multiplexing of multicarrie...H04W 52/50 at the moment of starting c...H04W 72/0453 Resources in frequency doma...
