The invention discloses a method and a device for carrying out hot
backup on services, by which the service hot
backup under the condition of RRU (radio
remote unit) annular connection is realized quickly and effectively, and the problem of service interruption caused by that the time
delay for realizing the service hot
backup is long in the prior art is solved. The method comprises the following steps that: after an RRU accesses to a BBU (building base band unit), the BBU establishes a channel, and calculates and allocates a first
delay measurement value and a second
delay measurement value, wherein the first delay measurement value refers to a
value of time delay that the RRU accesses to the BBU from a first link, and the second delay measurement value refers to a
value of time delay that the RRU accesses to the BBU from a second link; after carrying out parameter configuration and
cell configuration on the RRU, the BBU carries out service interaction on the first link; when determining that the first link is at fault, the BBU enables an IQ (intelligent) configuration corresponding to the first link and enables an IQ configuration corresponding to the second link; and after the RRU switches a
clock from the first link to the second link and configures the time delay value from the first delay measurement value to the second delay measurement value, the BBU continues to perform the service above with the RRU.