METHOD, APPARATUS FOR DYNAMIC RESOURCE ALLOCATION METHOD IN OFDMA-BASED COGNITIVE RADIO SYSTEM AND FORWARD LINK FRAME STRUCTURE THEREOF
First Claim
1. A dynamic resource allocation method used by a base station (BS) to allocate a subchannel to a terminal in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cognitive radio system, the method comprising:
- the BS selecting one of an Adaptive Modulation and Coding (AMC) subchannel allocation scheme, in which a subchannel comprising at least one bin comprising a first plurality of continuous subcarriers in a frequency domain is allocated, and a diversity subchannel allocation scheme, in which a subchannel comprising a second plurality of scattered subcarriers in the frequency domain is allocated, according to a level of frequency selectivity of an unused idle frequency band; and
the BS allocating at least one subchannel to the terminal according to the selected subchannel allocation scheme.
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Accused Products
Abstract
Provided are a dynamic resource allocation method and apparatus in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cognitive radio system and a downlink frame structure of the method and apparatus. The method includes a base station (BS) selecting one of an Adaptive Modulation and Coding (AMC) subchannel allocation scheme, in which a subchannel comprising at least one bin comprising a first plurality of continuous subcarriers in a frequency domain, is allocated, and a diversity subchannel allocation scheme, in which a subchannel comprising a second plurality of scattered subcarriers in the frequency domain is allocated, according to a level of frequency selectivity of an unused idle frequency band; and the BS allocating at least one subchannel to a terminal according to the selected subchannel allocation scheme. Accordingly, downlink throughput in the cognitive radio system can be increased.
82 Citations
54 Claims
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1. A dynamic resource allocation method used by a base station (BS) to allocate a subchannel to a terminal in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cognitive radio system, the method comprising:
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the BS selecting one of an Adaptive Modulation and Coding (AMC) subchannel allocation scheme, in which a subchannel comprising at least one bin comprising a first plurality of continuous subcarriers in a frequency domain is allocated, and a diversity subchannel allocation scheme, in which a subchannel comprising a second plurality of scattered subcarriers in the frequency domain is allocated, according to a level of frequency selectivity of an unused idle frequency band; and the BS allocating at least one subchannel to the terminal according to the selected subchannel allocation scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 46)
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24. A downlink frame structure for dynamic resource allocation in an OFDMA-based cognitive radio system, the downlink frame structure comprising:
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a slot comprising a first plurality of OFDM symbols; a frame, which has a first length of time according to a period of time for performing channel state measurement of a terminal and dynamic resource allocation of a BS and comprises a second plurality of slots; and a super frame having a second length of time and comprising a third plurality of frames. - View Dependent Claims (25, 26, 27, 47)
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28. A dynamic resource allocation method used by a terminal to receive a subchannel allocated by a base station (BS) in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cognitive radio system, the method comprising:
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an allocation information receiving process, wherein a terminal receives, from a base station (BS), information on a subchannel allocated according to a subchannel allocation scheme selected by the BS based on a level of frequency selectivity of an unused idle frequency band from among an Adaptive Modulation and Coding (AMC) subchannel allocation scheme, in which a subchannel comprising at least one bin comprising a first plurality of continuous subcarriers in a frequency domain is allocated, and a diversity subchannel allocation scheme, in which a subchannel comprising a second plurality of scattered subcarriers in the frequency domain is allocated; and a communication process, wherein the terminal communicates with the BS using the allocated subchannel based on the received information on the allocated subchannel. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 48)
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49. A dynamic resource allocation apparatus of a base station (BS) for allocating a subchannel to a terminal in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cognitive radio system, the apparatus comprising:
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a selector selecting one of an Adaptive Modulation and Coding (AMC) subchannel allocation scheme, in which a subchannel comprising at least one bin comprising a first plurality of continuous subcarriers in a frequency domain is allocated, and a diversity subchannel allocation scheme, in which a subchannel comprising a second plurality of scattered subcarriers in the frequency domain is allocated, according to a level of frequency selectivity of an unused idle frequency band; and an allocation unit allocating at least one subchannel to the terminal according to the selected subchannel allocation scheme. - View Dependent Claims (50, 51)
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52. A dynamic resource allocation apparatus of a terminal to which a base station (BS) allocates a subchannel, in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cognitive radio system, the apparatus comprising:
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an allocation information receiver receiving, from the BS, information on a subchannel allocated according to a subchannel allocation scheme selected by the BS based on a level of frequency selectivity of an unused idle frequency band from among an Adaptive Modulation and Coding (AMC) subchannel allocation scheme, in which a subchannel comprising at least one bin comprising a first plurality of continuous subcarriers in a frequency domain is allocated, and a diversity subchannel allocation scheme, in which a subchannel comprising a second plurality of scattered subcarriers in the frequency domain is allocated; and a communication unit communicating with the BS using the allocated subchannel based on the received information on the allocated subchannel. - View Dependent Claims (53, 54)
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Specification