A voice quality assessment method performed by a network node in a wireless communication system, to assess the end-to-end voice quality between a first user equipment accessing a first access node and a second user equipment accessing a second access node, comprising: obtaining a first transmission error code parameter and a second transmission error code parameter, wherein the first transmission error code parameter is a transmission error code parameter of an uplink channel of the first user equipment, and the second transmission error code parameter is a transmission error code parameter of a downlink channel of the second user equipment; characterized by generating an end-to-end voice quality index between the first user equipment and the second user equipment according to the first transmission error code parameter and the second transmission error code parameter, wherein the end-to-end voice quality index is a sum of the first transmission error code parameter and the second transmission error code parameter or is a sum of a product of the first transmission error code parameter and a first weight value and a product of the second transmission error code parameter and a second weight value, wherein the obtaining a first transmission error code parameter of an uplink channel of the first user equipment and a second transmission error code parameter of a downlink channel of the second user equipment comprises: determining the first access node accessed by the first user equipment and the second access node accessed by the second user equipment; obtaining the first transmission error code parameter from the first access node; and obtaining the second transmission error code parameter from the second access node. obtaining a first transmission error code parameter and a second transmission error code parameter, wherein the first transmission error code parameter is a transmission error code parameter of an uplink channel of the first user equipment, and the second transmission error code parameter is a transmission error code parameter of a downlink channel of the second user equipment; characterized by generating an end-to-end voice quality index between the first user equipment and the second user equipment according to the first transmission error code parameter and the second transmission error code parameter, wherein the end-to-end voice quality index is a sum of the first transmission error code parameter and the second transmission error code parameter or is a sum of a product of the first transmission error code parameter and a first weight value and a product of the second transmission error code parameter and a second weight value, wherein the obtaining a first transmission error code parameter of an uplink channel of the first user equipment and a second transmission error code parameter of a downlink channel of the second user equipment comprises: determining the first access node accessed by the first user equipment and the second access node accessed by the second user equipment; obtaining the first transmission error code parameter from the first access node; and obtaining the second transmission error code parameter from the second access node. determining the first access node accessed by the first user equipment and the second access node accessed by the second user equipment; obtaining the first transmission error code parameter from the first access node; and obtaining the second transmission error code parameter from the second access node.