METHOD FOR SWITCHING AND MANAGING FREQUENCY ACCESS IN COGNITIVE RADIO SYSTEM, BASE STATION AND SUBSCRIBER STATION USING THE SAME
First Claim
1. A channel switching method performed by a base station in a cognitive radio system, the method comprising:
- detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE);
transmitting a channel switching request message requesting switching from the first frequency channel to a second frequency channel; and
performing channel switching from the first frequency channel to the second frequency channel when receiving from the CPE a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message.
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Accused Products
Abstract
Provided are a channel switching method for effectively performing channel switching in a cognitive radio system while protecting an incumbent user, a method of managing a frequency channel, and a base station and customer premises equipment (CPE) using the methods. In the channel switching method performed by the base station, a currently unavailable first frequency channel is detected from among at least one uplink/downlink frequency channel which is set as a communication channel with the CPE; a channel switching request message requesting switching from the first frequency channel to a second frequency channel is transmitted to the CPE; and the first frequency channel is switched to the second frequency channel when a channel switching report message reporting that channel switching is to be performed in response to the channel switching request message is received from the CPE.
63 Citations
78 Claims
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1. A channel switching method performed by a base station in a cognitive radio system, the method comprising:
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detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE); transmitting a channel switching request message requesting switching from the first frequency channel to a second frequency channel; and performing channel switching from the first frequency channel to the second frequency channel when receiving from the CPE a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message. - View Dependent Claims (2, 3)
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4. A channel switching method performed by customer premises equipment (CPE) in a cognitive radio system, the method comprising:
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performing channel switching from a currently unavailable first frequency to a second frequency channel, from among at least one uplink/downlink frequency channel which is set as a communication channel with a base station, when receiving a channel switching request message requesting switching from the first frequency channel to the second frequency channel; and transmitting to the base station a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message. - View Dependent Claims (5)
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6. A channel switching method performed by a base station in a cognitive radio system, the method comprising:
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detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE); and performing channel switching from the first frequency channel as a communication channel to a second frequency channel which is predefined with the CPE. - View Dependent Claims (7, 8, 9, 10)
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11. A channel switching method performed by customer premises equipment (CPE) in a cognitive radio system, the method comprising:
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detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with a base station; and performing channel switching from the first frequency to a second frequency channel which is predefined with the base station. - View Dependent Claims (12, 13, 14, 17)
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15. A channel switching method performed by a base station in a cognitive radio system, the method comprising:
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detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE); transmitting a channel switching request message requesting switching from the first frequency channel to a second frequency channel, to the CPE via an outband channel; and upon receiving from the CPE a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message, switching from the first frequency channel to the second frequency channel. - View Dependent Claims (16)
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18. A channel switching method performed by customer premises equipment (CPE) in a cognitive radio system, the method comprising:
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receiving a channel switching request message requesting switching from a first frequency channel, which is a currently set communication channel, to a second frequency channel from a base station via an outband channel; switching from the first frequency channel to the second frequency channel based on the channel switching request message; and transmitting to the base station a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message. - View Dependent Claims (19)
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20. A channel switching method performed by a base station in a cognitive radio system, the method comprising:
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detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE); performing explicit signaling in which a channel switching request message requesting switching from the first frequency channel to a second frequency channel is transmitted to the CPE, and waiting for a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message to be received from the CPE; upon receiving the channel switching report message from the CPE, performing channel switching from the first frequency channel to the second frequency channel, using explicit signaling; and when the channel switching report message is not received from the CPE, performing channel switching from the first frequency channel to a third frequency channel which is predefined with the CPE, using implicit signaling. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A channel switching method performed by customer premises equipment (CPE) in a cognitive radio system, the method comprising:
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performing channel switching using explicit signaling, in which, when receiving a channel switching request message requesting switching from a currently unavailable first frequency channel to a second frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with a base station, a channel switching report message reporting which channel switching is to be performed in response to the channel switching request message is transmitted to the base station and the first frequency channel is switched to the second frequency channel; and performing channel switching using implicit signaling, in which the currently unavailable first frequency channel is detected based on whether messages that are to be received, including the channel switching request message, are received and the result of a channel search performed by the CPE; and
the detected first frequency channel is switched to a third frequency channel which is predefined with the base station. - View Dependent Claims (31, 32, 33, 34, 35)
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36. A method of allowing a base station to determine whether a frequency channel for communication with customer premises equipment (CPE) is available in a cognitive radio system, the method comprising:
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determining whether a channel search report message, which is transmitted from the CPE in response to a channel search request from the base station, and an automatic report message, which is periodically transmitted from the CPE to the base station, are received from the CPE; and determining whether an uplink/downlink frequency channel is available for the CPE, based on whether the channel search report message is received and whether the automatic report message is received. - View Dependent Claims (37, 38, 39, 40, 41)
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42. A channel switching apparatus included in a base station of a cognitive radio system, the apparatus comprising:
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a detecting unit detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE); a channel switching request message transmitting unit transmitting a channel switching request message requesting switching from the first frequency channel to a second frequency channel, to the CPE; and a channel switching unit switching from the first frequency channel to the second frequency channel when receiving from the CPE a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message. - View Dependent Claims (43, 44)
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45. A channel switching apparatus included in customer premises equipment (CPE) of a cognitive radio system, the apparatus comprising:
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a channel switching unit switching from a currently unavailable first frequency channel to a second frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with a base station, when receiving a channel switching request message requesting switching from the first frequency channel to the second frequency channel; and a channel switching report message transmitting unit transmitting to the base station a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message. - View Dependent Claims (46)
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47. A channel switching apparatus included in a base station of a cognitive radio system, the apparatus comprising:
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a detecting unit detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE); and a channel switching unit switching from the first frequency channel as a communication channel to a second frequency channel which is predefined with the CPE. - View Dependent Claims (48, 49, 50, 51)
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52. A channel switching apparatus included in customer premises equipment (CPE) of a cognitive radio system, the apparatus comprising:
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a detecting unit detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with a base station; and a channel switching unit switching from the first frequency channel as a communication channel to a second frequency channel which is predefined with the base station. - View Dependent Claims (53, 54, 55)
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56. A channel switching apparatus included in a base station of a cognitive radio system, the apparatus comprising:
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a detecting unit detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE); a channel switching request message transmitting unit transmitting a channel switching request message requesting switching from the first frequency channel to a second frequency channel, to the CPE via an outband channel; and a channel switching unit switching from the first frequency channel to the second frequency channel, when receiving from the CPE a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message. - View Dependent Claims (57, 58)
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59. A channel switching apparatus included in customer premises equipment (CPE) of a cognitive radio system, the apparatus comprising:
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a channel switching request message receiving unit receiving a channel switching request message requesting switching from a first frequency channel, which is a currently set communication channel, to a second frequency channel, from the base station via an outband channel; a channel switching unit switching the first frequency channel as a communication channel to the second frequency channel based on the channel switching request message; and a channel switching report message transmitting unit transmitting to the base station a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message. - View Dependent Claims (60)
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61. A channel switching apparatus included in a base station of a cognitive radio system, the apparatus comprising:
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a detecting unit detecting a currently unavailable first frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with customer premises equipment (CPE); an explicit signaling unit transmitting a channel switching request message requesting switching from the first frequency channel to a second frequency channel to the CPE, and waiting to receive from the CPE a channel switching report message that reports that channel switching is to be performed in response to the channel switching request message; a channel switching unit switching from first frequency channel to the second frequency channel by using explicit signaling, when receiving the channel switching report message from the CPE; and a channel switching unit switching from the first frequency channel to a third frequency channel, which is predefined with the CPE, by using implicit signaling, when the channel switching unit does not receive the channel switching report message from the CPE. - View Dependent Claims (62)
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63. A channel switching apparatus included in customer premises equipment (CPE) of a cognitive radio system, the apparatus comprising:
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a channel switching unit transmitting to a base station a channel switching report message that reports that channel switching is to be performed in response to a channel switching request message, and switching from a first frequency channel to a second frequency channel by using explicit signaling, when receiving the channel switching request message requesting switching the first frequency channel, which is currently unavailable, to the second frequency channel from among at least one uplink/downlink frequency channel which is set as a communication channel with the base station; and a channel switching unit detecting the currently unavailable frequency channel, based on whether messages that are to be received, including the channel switching request message, are received and the result of a channel search performed by the CPE, and switching the detected first frequency channel to a third frequency channel which is predefined with the base station. - View Dependent Claims (64)
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65. An apparatus which is included in a base station of a cognitive radio system and determines whether a frequency channel is available for communication with customer premises equipment (CPE), the apparatus comprising:
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a message reception determination unit determining whether a channel search report message, which is transmitted from the CPE in response to a channel search request from the base station, and an automatic report message, which is periodically transmitted from the CPE to the base station, are received from the CPE; and an availability determination unit determining whether an uplink/downlink frequency channel is available between the base station and the CPE, based on whether the channel search report message is received and whether the automatic report message is received. - View Dependent Claims (66, 67, 68, 69)
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70. A method of allowing a base station to manage an uplink/downlink frequency channel for use in communication with each customer premises equipment (CPE) in a cognitive radio system, the method comprising:
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generating and managing channel matching information regarding a pair of a uplink frequency channel and a downlink frequency channel which are used by the same CPE; and transmitting the generated channel matching information to the CPEs. - View Dependent Claims (71, 72)
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73. A method of allowing customer premises equipment (CPE) to manage an uplink/downlink frequency channel for use in communication in a cognitive radio system, the method comprising:
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receiving channel matching information regarding a pair of a uplink frequency channel and a downlink frequency channel, which are used by the same CPE, from a base station; and performing processing by obtaining information regarding a channel to the CPE or by performing channel switching. - View Dependent Claims (74)
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75. An apparatus which is included in a base station of a cognitive radio system and manages a uplink/downlink frequency channel, the apparatus comprising:
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a management unit generating and managing channel matching information regarding a pair of a uplink frequency channel and a downlink frequency channel which are used by the same customer premises equipment (CPE); and a transmitting unit transmitting the generated channel matching information to the CPEs. - View Dependent Claims (76)
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77. An apparatus which is included in customer premises equipment (CPE) of a cognitive radio system and manages a uplink/downlink frequency channel, the apparatus comprising:
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a receiving unit receiving channel matching information regarding a pair of uplink frequency channel and a downlink frequency channel, which are used by the same CPE, from a base station; and a processor obtaining information regarding a channel allocated to the CPE or performing channel switching, based on the received channel matching information. - View Dependent Claims (78)
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Specification