US Patent No. 9,762,421

METHOD AND DEVICE FOR DETERMINING AVAILABLE SPECTRUMS


Patent No. 9,762,421
Issue Date September 12, 2017
Title Method And Device For Determining Available Spectrums
Inventorship Yuanyuan Li, Beijing (CN)
Yeming Tang, Beijing (CN)
Wenling Bai, Beijing (CN)
Chenggang Jiang, Beijing (CN)
Yu Yang, Beijing (CN)
Xiaolu Wang, Beijing (CN)
Xin Tong, Beijing (CN)
Assignee CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)

Claim of US Patent No. 9,762,421

6. A base station, comprising:
a processor and a non-transitory storage, wherein the non-transitory storage is to store one or more instructions to be executed
by the processor, and the one or more instructions comprise:

a receiving instruction, to receive a request message for introducing a cognitive system on a first frequency sent by a database
server;

a ranging instruction, to determine a first distance between the base station and a base station of an incumbent system using
the first frequency and a second distance between the base station and a base station of an incumbent system using a second
frequency adjacent to the first frequency after the receiving instruction receives the request message;

a first determination instruction, to determine whether the cognitive system and the incumbent system operating on the first
frequency meet a co-channel coexistence criterion according to the first distance determined by the ranging instruction, wherein
the co-channel coexistence criterion includes that both the cognitive system and the incumbent system operating on the first
frequency operate normally;

a second determination instruction, to determine whether the cognitive system and the incumbent system operating on the second
frequency meet a corresponding frequency coexistence criterion according to the second distance determined by the ranging
instruction after the first determining instruction determines that the co-channel coexistence criterion is met, wherein the
corresponding frequency coexistence criterion includes that both the cognitive system and the incumbent system operating on
the second frequency operate normally; and

a transmission instruction, to determine that the first frequency is available and to report a response message to the database
server indicating that the first frequency is an available frequency when the second determination instruction determines
that the corresponding frequency coexistence criterion is met;

wherein the co-channel coexistence criterion or the corresponding frequency coexistence criterion is specifically:
Dcr(n)>MAX(D1,D2);

wherein, Dcr (n) resents the distance between the base station and the base station of the incumbent system using the frequency
n;

D1 represent the distance isolation required for the normal operation of the cognitive system when the base station of the incumbent
system interferes with the base station of the cognitive system; and

D2 represents the distance isolation required for the normal operation of the incumbent system when the base station of the
cognitive system interferes with the base station of the incumbent system.