An electronic device for managing a shared spectrum or an unlicensed spectrum among a plurality of base stations, BSs, the electronic device comprising: memory comprising instructions for managing the shared spectrum or the unlicensed spectrum; and at least one processor operably connected to the memory, the at least one processor configured to execute the instructions to cause the electronic device to: obtain reports related to coexistence measurement from the plurality of BSs; identify interference relationship among the plurality of BSs based on the reports; assign a primary BS and a secondary BS among the plurality of BSs to at least one basic allocation unit based on the interference relationship, wherein the basic allocation unit is at least one of time or frequency unit, wherein the primary BS is assigned to a prioritized transmission period in the at least one basic allocation unit and data related to the primary BS is transmitted in the prioritized transmission period without channel sensing, and wherein the secondary BS is assigned to a secondary transmission opportunity period in the at least one basic allocation unit and data related to the secondary BS is transmitted in the secondary transmission opportunity period after channel sensing; transmit first information for granting a spectrum access to the primary BS, wherein the first information for granting the spectrum access includes an assignment of a basic allocation unit for the primary BS; and transmit second information for granting a spectrum access to the secondary BS, wherein the second information for granting the spectrum access includes an assignment of a basic allocation unit for the secondary BS. memory comprising instructions for managing the shared spectrum or the unlicensed spectrum; and at least one processor operably connected to the memory, the at least one processor configured to execute the instructions to cause the electronic device to: obtain reports related to coexistence measurement from the plurality of BSs; identify interference relationship among the plurality of BSs based on the reports; assign a primary BS and a secondary BS among the plurality of BSs to at least one basic allocation unit based on the interference relationship, wherein the basic allocation unit is at least one of time or frequency unit, wherein the primary BS is assigned to a prioritized transmission period in the at least one basic allocation unit and data related to the primary BS is transmitted in the prioritized transmission period without channel sensing, and wherein the secondary BS is assigned to a secondary transmission opportunity period in the at least one basic allocation unit and data related to the secondary BS is transmitted in the secondary transmission opportunity period after channel sensing; transmit first information for granting a spectrum access to the primary BS, wherein the first information for granting the spectrum access includes an assignment of a basic allocation unit for the primary BS; and transmit second information for granting a spectrum access to the secondary BS, wherein the second information for granting the spectrum access includes an assignment of a basic allocation unit for the secondary BS. obtain reports related to coexistence measurement from the plurality of BSs; identify interference relationship among the plurality of BSs based on the reports; assign a primary BS and a secondary BS among the plurality of BSs to at least one basic allocation unit based on the interference relationship, wherein the basic allocation unit is at least one of time or frequency unit, wherein the primary BS is assigned to a prioritized transmission period in the at least one basic allocation unit and data related to the primary BS is transmitted in the prioritized transmission period without channel sensing, and wherein the secondary BS is assigned to a secondary transmission opportunity period in the at least one basic allocation unit and data related to the secondary BS is transmitted in the secondary transmission opportunity period after channel sensing; transmit first information for granting a spectrum access to the primary BS, wherein the first information for granting the spectrum access includes an assignment of a basic allocation unit for the primary BS; and transmit second information for granting a spectrum access to the secondary BS, wherein the second information for granting the spectrum access includes an assignment of a basic allocation unit for the secondary BS.