US Patent No. 9,210,726

RANDOM ACCESS METHOD AND DEVICE IN COGNITIVE RADIO SYSTEM


Patent No. 9,210,726
Issue Date December 08, 2015
Title Random Access Method And Device In Cognitive Radio System
Inventorship Wenling Bai, Beijing (CN)
Zhuo Gao, Beijing (CN)
Chenggang Jiang, Beijing (CN)
Yuanyuan Li, Beijing (CN)
Yu Yang, Beijing (CN)
Assignee CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)

Claim of US Patent No. 9,210,726

1. A random access method in a cognitive radio system, comprising:
generating, by a base station device, a spectrum handover command, wherein the spectrum handover command comprises random
access backoff time parameter information; and

sending, by the base station device, the spectrum handover command to a user equipment in a cell to instruct the UE to initiate,
during a spectrum handover procedure, a random access procedure using the random access backoff time parameter information;

wherein the random access backoff time information comprises:
a random access delay factor sequence associated with service levels of different UEs in the cell, and
wherein the random access delay factor sequence is presented as T1, T2, Ti?1, Ti . . . TM, wherein M is the total number of
the service levels T is a maximum random access delay factor of the i-th service level, and Ti is a minimum random access
delay factor of the (i+1)-th service level.