Multi-cell communication apparatus and method using rate-splitting scheme and transmission frame
Provided is a multi-cell communication system using a rate-splitting scheme and a transmission frame for the multi-cell communication system. The multi-cell communication system may determine whether to perform a rate-splitting based on channel information of a macro base station and a femto base station in a multi-cell environment. The multi-cell communication system may allocate a power or a bandwidth to a message to be transmitted based on the channel information. In the multi-cell environment, a terminal may receive MAP information from a base station and may decode the received MAP information, determining a base station that performs the rate-splitting.
1. A target base station in a multi-cell environment, the target base station comprising:
a mode setting unit configured to set a rate-splitting mode based on channel information of the target base station and channel information of a neighbor base station, the rate-splitting mode configured to set a base station to use a rate-splitting scheme from among the target base station and the neighbor base station; and
a power/bandwidth setting unit configured to allocate, based on the rate-splitting mode, a power or a bandwidth to at least one message.
2. The target base station of claim 1 , further comprising an inter-cell information exchanging unit configured to:
transmit channel information of the target base station to the neighbor base station; and
receive channel information of the neighbor base station from the neighbor base station.
3. The target base station of claim 1 , wherein the mode setting unit is further configured to set one of at least one candidate mode as the rate-splitting mode, the at least one candidate mode comprising at least one of four modes comprising:
a first mode configured to indicate that both the target base station and the neighbor base station use the rate-splitting scheme;
a second mode configured to indicate that only the neighbor base station uses the rate-splitting scheme;
a third mode configured to indicate that only the target base station uses the rate-splitting scheme; and
a fourth mode configured to indicate that both the target base station and the neighbor base station do not use the rate-splitting scheme.
4. The target base station of claim 1 , wherein:
the channel information is calculated based on an interference-to-noise ratio (INR) and a signal-to-noise ratio (SNR); and
the mode setting unit is further configured to set the rate-splitting mode to enable both the target base station and the neighbor base station to use the rate-splitting scheme in response to the channel information of the target base station and the channel information of the neighbor base station being greater than a predetermined value.
5. The target base station of claim 1 , wherein:
the channel information is calculated based on an INR and an SNR; and
the mode setting unit is further configured to set the rate-splitting mode to enable only the neighbor base station to use the rate-splitting scheme in response to the channel information of the target base station being greater than or equal to a sum of the channel information of the neighbor base station and a predetermined margin.
6. The target base station of claim 1 , wherein:
the channel information is calculated based on an INR and an SNR; and
the mode setting unit is further configured to set the rate-splitting mode to enable only the target base station to use the rate-splitting scheme in response to the channel information of the neighbor base station being greater than or equal to a sum of the channel information of the target base station and a predetermined margin.
7. The target base station of claim 1 , wherein:
the channel information is calculated based on an INR and an SNR; and
the mode setting unit is further configured to set the rate-splitting mode to enable both the target base station and the neighbor base station to not use the rate-splitting scheme in response to an absolute value of a difference between the channel information of the target base station and the channel information of the neighbor base station being less than or equal to a predetermined margin.
8. The target base station of claim 1 , wherein:
the channel information is calculated based on an INR and an SNR; and
the power/bandwidth setting unit is further configured to allocate, based on the channel information, a power or a bandwidth to the at least one message.
9. The target base station of claim 1 , further comprising a Quality of Service (QoS) setting unit configured to set a QoS of the target base station based on the channel information of the target base station and the channel information of the neighbor base station.
10. The target base station of claim 1 , further comprising a MAP generating unit configured to generate a transmission frame comprising MAP information comprising an indicator indicating the rate-splitting mode.
11. The target base station of claim 10 , wherein the MAP information further comprises information associated with a modulation and coding scheme (MCS) level corresponding to each of the at least one message.
12. A terminal in a multi-cell environment, the terminal comprising:
a receiving unit configured to receive MAP information, the MAP information comprising an indicator configured to indicate a rate-splitting mode, the rate-splitting mode configured to set a base station to use a rate-splitting scheme from among a target base station and a neighbor base station; and
a decoder configured to decode, based on the MAP information, at least one message transmitted from each of the target base station and the neighbor base station.
13. The terminal of claim 12 , wherein:
the MAP information further comprises information associated with an MCS level corresponding to each of the at least one message; and
the decoder is further configured to decode the at least one message based on the information associated with the MSC level corresponding to each of the at least one message.
14. The terminal of claim 12 , further comprising an SNR and INR measuring unit configured to:
calculate an SNR and an INR; and
generate channel information of the target base station.
15. A communication method in a multi-cell environment, the method comprising:
setting a rate-splitting mode based on channel information of a target base station and channel information of a neighbor base station, the rate-splitting mode setting a base station to use a rate-splitting scheme from among the target base station and the neighbor base station; and
allocating, based on the rate-splitting mode, a power or a bandwidth to at least one message.
16. The method of claim 15 , further comprising:
transmitting channel information of the target base station to the neighbor base station; and
receiving channel information of the neighbor base station from the neighbor base station.
17. The method of claim 15 , wherein:
the channel information is calculated based on an INR and an SNR; and
the setting sets the rate-splitting mode to enable both the target base station and the neighbor base station to use the rate-splitting scheme in response to the channel information of the target base station and the channel information of the neighbor base station being greater than a predetermined value.
18. The method of claim 15 , wherein:
the channel information is calculated based on an INR and an SNR; and
the setting sets the rate-splitting mode to enable only the neighbor base station to use the rate-splitting scheme in response to the channel information of the target base station being greater than or equal to a sum of the channel information of the neighbor base station and a predetermined margin.
19. The method of claim 15 , wherein:
the channel information is calculated based on an INR and an SNR; and
the setting sets the rate-splitting mode to enable only the target base station to use the rate-splitting scheme in response to the channel information of the neighbor base station being greater than or equal to a sum of the channel information of the target base station and a predetermined margin.
20. The method of claim 15 , wherein:
the channel information is calculated based on an INR and an SNR; and
the setting sets the rate-splitting mode to enable both the target base station and the neighbor base station to not use the rate-splitting scheme in response to a difference between the channel information of the target base station and the channel information of the neighbor base station being less than or equal to a predetermined margin.
21. The method of claim 15 , wherein:
the channel information is calculated based on an INR and an SNR; and
the allocating allocates, based on the channel information, a power or a bandwidth to the at least one message.
22. The method of claim 15 , further comprising setting a QoS of the target base station based on the channel information of the target base station and the channel information of the neighbor base station.
23. The method of claim 15 , further comprising generating a transmission frame comprising MAP information comprising an indicator indicating the rate-splitting mode.
24. The method of claim 23 , wherein the MAP information further comprises information associated with an MCS level corresponding to each of the at least one message.