Method for notifying bandwidth information, method for processing service, network node and communication system

The invention relates to the technical field of communication, and discloses a method for notifying bandwidth information, a method for processing service, a network node and a communication system. The method for notifying bandwidth information comprises the following steps: detecting the current modulation mode of a microwave link; obtaining bandwidth information of the microwave link at the current modulation mode; and transmitting the bandwidth information to an end point connected with the service by the service connection of the microwave link located so that the end point connected with the service carries out service policy adjustment according to the bandwidth information. The technical scheme of the invention enables the end point of the service connection, at which the microwave link is located, to obtain the bandwidth information after the self-adapting modulation of the microwave link.