Method and apparatus for spectrum sharing operation in multiple wireless communication systems

1 . A method performed by a first base station (BS) in a wireless communication system, the method comprising:

receiving second network information of a second BS from the second BS in the wireless communication system, wherein the first BS supports a first wireless access scheme that is different from a second wireless access scheme of the second BS, and shares a same frequency band with the second BS;

determining a resource allocation ratio between the first BS and the second BS according to a predefined resource allocation scheme, based on first network information of the first BS and the second network information of the second BS, wherein the first network information comprises information on an amount of data in a buffer of at least one first terminal connected to the first BS, and the second network information comprises information on an amount of data in a buffer of at least one second terminal connected to the second BS; and

transmitting information on the resource allocation ratio to the second BS.

2 . The method of claim 1 , wherein the first network information further comprises at least one of information on a number of terminals connected to the first BS, or information on an amount of resources used for data transmission of the first BS, and

wherein the second network information further comprises at least one of information on a number of terminals connected to the second BS, or information on an amount of resources used for data transmission of the second BS.

3 . The method of claim 2 , wherein the determining the resource allocation ratio comprises determining a state for the wireless communication system based on the information on the amount of data in the buffer of the at least one first terminal connected to the first BS and the information on the amount of data in the buffer of the at least one second terminal connected to the second BS.

4 . The method of claim 3 , wherein the state is one of:

a first state in which a number of heavy Buffer Occupancy (BO) terminals connected to the first BS and a number of heavy BO terminals connected to the second BS are equal to or less than a first value;

a second state in which the number of heavy BO terminals connected to the first BS exceeds the first value and the number of heavy BO terminals connected to the second BS is less than or equal to the first value;

a third state in which the number of heavy BO terminals connected to the first BS is less than or equal to the first value and the number of heavy BO terminals connected to the second BS exceeds the first value; and

a fourth state in which the number of heavy BO terminals connected to the first BS and the number of heavy BO terminals connected to the second BS exceed the first value, and

wherein a heavy BO terminal is determined based on whether the amount of data accumulated in a buffer of a corresponding terminal exceeds a specific threshold.

5 . The method of claim 4 , wherein the determining the resource allocation ratio comprises, in case that the state is changed, the first state is maintained, or the fourth state is maintained:

determining a ratio of terminals between the first BS and the second BS based on the information on the number of terminals connected to the first BS and the information on the number of terminals connected to the second BS; and

determining the resource allocation ratio between the first BS and the second BS based on the determined ratio of terminals.

6 . The method of claim 4 , wherein the determining the resource allocation ratio comprises, in case that the second state is maintained:

determining an amount of remaining resources for the second BS based on the information on the amount of resources used for data transmission of the second BS; and

tuning the resource allocation ratio between the first BS and the second BS based on the amount of remaining resources.

7 . The method of claim 4 , wherein the determining the resource allocation ratio comprises, in case that the third state is maintained:

determining an amount of remaining resources for the first BS based on the information on the amount of resources used for data transmission of the first BS; and

tuning the resource allocation ratio between the first BS and the second BS based on the amount of remaining resources.

8 . The method of claim 1 , wherein the first wireless access scheme is a Long Term Evolution (LTE) wireless access scheme, and

wherein the second wireless access scheme is a New Radio (NR) wireless access scheme.

9 . A first base station (BS) in a wireless communication system, the first BS comprising:

a transceiver;

memory storing instructions, and

at least one processor coupled to the transceiver and the memory, wherein the instructions when executed by the at least one processor, individually or collectively, cause the first BS to:

receive second network information of a second BS from the second BS in the wireless communication system, wherein the first BS is configured to support a first wireless access scheme that is different from a second wireless access scheme of the second BS, and share a same frequency band with the second BS;

determine a resource allocation ratio between the first BS and the second BS according to a predefined resource allocation scheme, based on first network information of the first BS and the second network information of the second BS, wherein the first network information comprises information on an amount of data in a buffer of at least one first terminal connected to the first BS, and the second network information comprises information on an amount of data in a buffer of at least one second terminal connected to the second BS; and

transmit information on the resource allocation ratio to the second BS.

10 . The first BS of claim 9 , wherein the first network information further comprises at least one of information on a number of terminals connected to the first BS, or information on an amount of resources used for data transmission of the first BS, and

wherein the second network information further comprises at least one of information on a number of terminals connected to the second BS, or information on an amount of resources used for data transmission of the second BS.

11 . The first BS of claim 10 , wherein the instructions when executed by the at least one processor, individually or collectively, cause the first BS further to determine a state for the wireless communication system based on the information on the amount of data in the buffer of the at least one first terminal connected to the first BS and the information on the amount of data in the buffer of the at least one second terminal connected to the second BS.

12 . The first BS of claim 11 , wherein the state is one of:

a first state in which a number of heavy Buffer Occupancy (BO) terminals connected to the first BS and a number of heavy BO terminals connected to the second BS are equal to or less than a first value;

a second state in which the number of heavy BO terminals connected to the first BS exceeds the first value and the number of heavy BO terminals connected to the second BS is less than or equal to the first value;

a third state in which the number of heavy BO terminals connected to the first BS is less than or equal to the first value and the number of heavy BO terminals connected to the second BS exceeds the first value; and

a fourth state in which the number of heavy BO terminals connected to the first BS and the number of heavy BO terminals connected to the second BS exceed the first value, and

wherein a heavy BO terminal is determined based on whether the amount of data accumulated in a buffer of a corresponding terminal exceeds a specific threshold.

13 . The first BS of claim 12 , wherein the instructions when executed by the at least one processor, individually or collectively, cause the first BS further to, in case that the state is changed, the first state is maintained, or the fourth state is maintained:

determine a ratio of terminals between the first BS and the second BS based on the information on the number of terminals connected to the first BS and the information on the number of terminals connected to the second BS; and

determine the resource allocation ratio between the first BS and the second BS based on the determined ratio of terminals.

14 . The first BS of claim 12 , wherein the instructions when executed by the at least one processor, individually or collectively, cause the first BS further to, in case that the second state is maintained:

determine an amount of remaining resources for the second BS based on the information on the amount of resources used for data transmission of the second BS; and

tune the resource allocation ratio between the first BS and the second BS based on the amount of remaining resources.

15 . The first BS of claim 12 , wherein the instructions when executed by the at least one processor, individually or collectively, cause the first BS further to, in case that the third state is maintained:

determine an amount of remaining resources for the first BS based on the information on the amount of resources used for data transmission of the first BS; and

tune the resource allocation ratio between the first BS and the second BS based on the amount of remaining resources.

16 . The first BS of claim 9 , wherein the first wireless access scheme is a Long Term Evolution (LTE) wireless access scheme, and

wherein the second wireless access scheme is a New Radio (NR) wireless access scheme.

17 . A non-transitory computer-readable storage medium storing instructions which, when executed by at least one processor of a first base station (BS) in a wireless communication system, individually or collectively, cause the first base station to perform operations comprising:

receiving second network information of a second BS from the second BS in the wireless communication system, wherein the first BS supports a first wireless access scheme that is different from a second wireless access scheme of the second BS, and shares a same frequency band with the second BS;

determining a resource allocation ratio between the first BS and the second BS according to a predefined resource allocation scheme, based on first network information of the first BS and the second network information of the second BS, wherein the first network information comprises information on an amount of data in a buffer of at least one first terminal connected to the first BS, and the second network information comprises information on an amount of data in a buffer of at least one second terminal connected to the second BS; and

transmitting information on the resource allocation ratio to the second BS.

18 . The non-transitory computer-readable storage medium of claim 17 , wherein the first network information further comprises at least one of information on a number of terminals connected to the first BS, or information on an amount of resources used for data transmission of the first BS, and

wherein the second network information further comprises at least one of information on a number of terminals connected to the second BS, or information on an amount of resources used for data transmission of the second BS.

19 . The non-transitory computer-readable storage medium of claim 18 , wherein the determining the resource allocation ratio comprises determining a state for the wireless communication system based on the information on the amount of data in the buffer of the at least one first terminal connected to the first BS and the information on the amount of data accumulated in the buffer of the at least one second terminal connected to the second BS.

20 . The non-transitory computer-readable storage medium of claim 19 , wherein the state is one of:

a first state in which a number of heavy Buffer Occupancy (BO) terminals connected to the first BS and a number of heavy BO terminals connected to the second BS are equal to or less than a first value;

a second state in which the number of heavy BO terminals connected to the first BS exceeds the first value and the number of heavy BO terminals connected to the second BS is less than or equal to the first value;

a third state in which the number of heavy BO terminals connected to the first BS is less than or equal to the first value and the number of heavy BO terminals connected to the second BS exceeds the first value; and

a fourth state in which the number of heavy BO terminals connected to the first BS and the number of heavy BO terminals connected to the second BS exceed the first value, and

wherein a heavy BO terminal is determined based on whether the amount of data accumulated in a buffer of a corresponding terminal exceeds a specific threshold.