Radio access network device, user equipment, and method for reporting status of buffer

A user equipment, comprising:

• a receiver, configured to receive configuration information transmitted by a radio access network device, wherein the configuration information is used for indicating manner information of reporting left amount of data cached in a buffer or time length for playing left amount of data cached in a buffer to the radio access network device by the user equipment;
• and
• a transmitter, configured to transmit response information to the radio access network device according to the received configuration information, wherein the response information is used for indicating the left amount of the data cached in the buffer or the time length for playing the left amount of the data cached in the buffer, which is reported by the user equipment.

A method for reporting status of a buffer, comprising:

• determining, by a radio access network device, whether a rate at which a user equipment receives service data is lower than a rate at which the user equipment plays service data;
• and
• increasing, by the radio access network device, resource for receiving downlink service data for the user equipment if it is determined that the rate at which the user equipment receives service data is lower than the rate at which the user equipment plays service data.