COMMUNICATION SYSTEM OF PERFORMING UPLINK COMMUNICATION AND DOWNLINK COMMUNICATION USING OVERLAPPING RADIO RESOURCE

• US 20110195704A1
• Filed: 12/07/2010
• Published: 08/11/2011
• Est. Priority Date: 02/09/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jang, Kyung Hun, Shin, Chang Yong, Choi, Hyun Ho, Noh, Won Jong, Shin, Won Jae
• Granted Patent: US 9,020,515 B2
• Time in Patent Office: Days
• US Class Current: 455/423
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/1263 Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A communication system performs an uplink communication and a downlink communication using respective radio resources that at least partially overlap each other in both time and frequency, which may cause interference to occur in at least one downlink terminal due to at least one uplink terminal. The at least one uplink terminal and the at least one downlink terminal may process the interference according to a rate split scheme, an interference control scheme, and the like. Interference occurring between at least one transmit antenna and at least one receive antenna of a base station may be processed according to an echo cancellation scheme and the like.

Claims

1. A communication method of a base station, the communication method comprising:

selecting at least one uplink terminal to perform an uplink communication and at least one downlink terminal to perform a downlink communication;

allocating a radio resource for the at least one uplink terminal and a radio resource for the at least one downlink terminal; and

performing the uplink communication with the at least uplink terminal and the downlink communication with the at least downlink terminal using the respective allocated radio resources;

wherein the radio resource for the at least one uplink terminal at least partially overlaps the radio resource for the at least one downlink terminal in both time and frequency.

2. The communication method of claim 1, wherein the selecting comprises selecting the at least one uplink terminal and the at least one downlink terminal based on interference between a plurality of terminals comprising the at least one uplink terminal and the at least one downlink terminal.

4. The communication method of claim 1, wherein the selecting comprises selecting the at least one uplink terminal and the at least one downlink terminal based on information regarding a channel formed between each of the terminals and the base station, or a characteristic of traffic corresponding to each of the terminals, or a location of each of the terminals, or a mobility of each of the terminals, or interference occurring in at least one receive antenna installed in the base station due to at least one transmit antenna installed in the base station, or information regarding interference channels formed between the terminals, and any combination thereof.

5. The communication method of claim 1, wherein a number of terminals selected as the at least one uplink terminal is different from a number of terminals selected as the at least one downlink terminal.

6. The communication method of claim 1, further comprising determining a transmission power or a modulation and coding scheme (MCS) level of the at least one uplink terminal.

7. The communication method of claim 6, wherein the determining comprises determining the transmission power or the MCS level of the at least one uplink terminal based on interference between the at least one uplink terminal and the at least one downlink terminal.

8. The communication method of claim 6, further comprising determining whether the at least one uplink terminal is to use a rate split scheme;

wherein the determining of the transmission power or the MCS level comprises determining an MCS level of each of a plurality of messages divided by the at least one uplink terminal if the at least one uplink terminal is to use a rate split scheme.

9. The communication method of claim 8, wherein the determining whether the at least one uplink terminal is to use a rate split scheme comprises adaptively determining whether the at least one uplink terminal is to use a rate split scheme based on interference between the at least one uplink terminal and the at least one downlink terminal.

10. The communication method of claim 1, further comprising transmitting control information to the at least one uplink terminal and the at least one downlink terminal;

wherein the control information comprises information regarding the respective allocated radio resources.

11. The communication method of claim 10, wherein the control information further comprises information regarding whether the at least one uplink terminal is to use a rate split scheme, and information regarding a modulation and coding scheme (MCS) level of each of a plurality of messages divided by the at least one uplink terminal if the at least one uplink terminal is to use a rate split scheme.

12. The communication method of claim 10, wherein the control information further comprises information regarding a transmission power or a modulation and coding scheme (MCS) level of the at least one uplink terminal.

13. The communication method of claim 1, wherein the performing comprises performing the uplink communication with the at least one uplink terminal using at least one receive antenna installed in the base station, and performing the downlink communication with at least one the downlink terminal using at least one transmit antenna installed in the base station that is different from the at least one receive antenna installed in the base station.

14. The communication method of claim 13, further comprising performing echo cancellation to substantially cancel interference occurring in the at least one receive antenna due to the at least one transmit antenna.

3. The communication method of 1, wherein the selecting comprises selecting the at least one uplink terminal and the at least one downlink terminal based on a balance between a volume of uplink communication traffic and a volume of downlink communication, and/or an achievable capacity of each of the uplink communication and the downlink communication.

15. A communication method of a downlink terminal to perform a downlink communication with a base station, the communication method comprising:

receiving a reference signal from at least one uplink terminal;

measuring an interference channel formed between the at least one uplink terminal and the downlink terminal based on the reference signal;

transmitting, to the base station, information regarding the measured interference channel so that the base station selects, from a plurality of terminals, at least one uplink terminal to perform an uplink communication and the downlink terminal to perform the downlink communication;

receiving, from the base station, control information comprising information regarding a radio resource for the downlink terminal; and

performing the downlink communication with the base station using the radio resource for the downlink terminal;

wherein a radio resource for the at least one uplink terminal at least partially overlaps the radio resource for the downlink terminal in both time and frequency.

16. The communication method of claim 15, wherein the performing comprises processing interference occurring in the at least one uplink terminal according to a particular interference control scheme.

17. The communication method of claim 16, wherein the particular interference control scheme corresponds to an interference treated as noise (ITN) scheme of treating the interference as noise, or a complete interference cancellation scheme of removing messages received from the at least one uplink terminal prior to decoding of a desired signal, or a partial interference cancellation scheme of partially removing messages received from the at least one uplink terminal prior to decoding of the desired signal, or any combination thereof.

18. The communication method of claim 15, wherein the control information further comprises information regarding whether the at least one uplink terminal is to use a rate split scheme, and information regarding a modulation and coding scheme (MCS) level of each of a plurality of messages divided by the at least one uplink terminal if the at least one uplink terminal is to use a rate split scheme.

19. The communication method of claim 15, wherein the control information further comprises information regarding a transmission power or a modulation and coding scheme (MCS) level of the at least one uplink terminal.

20. The communication method of claim 15, further comprising transmitting, to the base station, information regarding a channel formed between the base station and the downlink terminal.

21. A communication method of an uplink terminal to perform an uplink communication with a base station, the communication method comprising:

transmitting a reference signal to a downlink terminal so that the downlink terminal measures an interference channel formed between the uplink terminal and the downlink terminal;

receiving, from the base station, control information regarding a radio resource for the uplink terminal if the base station selects, from a plurality of terminals based on the measured interference channel, the uplink terminal and the downlink terminal; and

performing the uplink communication with the base station using the radio resource for the uplink terminal;

wherein the radio resource for the uplink terminal at least partially overlaps a radio resource for the downlink terminal in both time and frequency.

22. The communication method of claim 21, wherein the performing comprises performing the uplink communication by selectively using a rate split scheme depending on the interference channel.

23. The communication method of claim 21, wherein the control information further comprises information regarding whether the uplink terminal is to use a rate split scheme, and information regarding a modulation and coding scheme (MCS) level of each of a plurality of messages divided by the uplink terminal if the uplink terminal is to use a rate split scheme.

24. A non-transitory computer-readable medium comprising a program for instructing a computer to perform a communication method of a base station, the communication method comprising:

selecting at least one uplink terminal to perform an uplink communication and at least one downlink terminal to perform a downlink communication;

allocating a radio resource for the at least one uplink terminal and a radio resource for the at least one downlink terminal; and

performing the uplink communication with the at least uplink terminal and the downlink communication with the at least downlink terminal using the respective allocated radio resources;

wherein the radio resource for the at least one uplink terminal at least partially overlaps the radio resource for the at least one downlink terminal in both time and frequency.

25. A base station comprising:

a selector to select at least one uplink terminal to perform an uplink communication and at least one downlink terminal to perform a downlink communication;

an allocator to allocate a radio resource for the at least one uplink terminal and a radio resource for the at least one downlink terminal; and

a processor to perform the uplink communication with the at least one uplink terminal and the downlink communication with the at least one downlink terminal using the respective allocated radio resources,

wherein the radio resource for the at least one uplink terminal at least partially overlaps the radio resource for the at least one downlink terminal in both time and frequency.

26. The base station of claim 25, wherein the selector selects the at least one uplink terminal and the at least one downlink terminal based on interference between a plurality of terminals comprising the at least one uplink terminal and the at least one downlink terminal, or a balance between a volume of uplink communication traffic and a volume of downlink communication traffic, or an achievable capacity of each of the uplink communication and the downlink communication, or any combination thereof.

27. The base station of claim 25, wherein the selector selects the at least one uplink terminal and the at least one downlink terminal based on information regarding a channel formed between each of the terminals and the base station, or a characteristic of traffic corresponding to each of the terminals, or a location of each of the terminals, or a mobility of each of the terminals, or interference occurring in at least one receive antenna installed in the base station due to at least one transmit antenna installed in the base station, or information regarding interference channels formed between the terminals, or any combination thereof.

28. The base station of claim 25, further comprising a decision unit to determine a transmission power or a modulation and coding scheme (MCS) level of the at least one uplink terminal.

29. The base station of claim 25, further comprising a generator to generate control information comprising information regarding the respective allocated radio resources.

30. The base station of claim 25, further comprising an echo cancellation unit to perform an echo cancellation to substantially cancel interference occurring in at least one receive antenna installed in the base station due to at least one transmit antenna installed in the base station.

31. A downlink terminal to perform a downlink communication with a base station, the downlink terminal comprising:

a receiver to receive a reference signal from at least one uplink terminal;

a measurement unit to measure an interference channel formed between the at least one uplink terminal and the downlink terminal based on the reference signal;

a transmitter to transmit, to the base station, information regarding the measured interference channel so that the base station selects, from a plurality of terminals, at least one uplink terminal to perform an uplink communication and the downlink terminal to perform the downlink communication; and

a processor to recognize a radio resource for the downlink terminal based on control information comprising information regarding the radio resource for the downlink terminal received from the base station, and to perform the downlink communication with the base station using the radio resource for the downlink terminal;

wherein a radio resource for the at least one uplink terminal at least partially overlaps the radio resource for the downlink terminal in both time and frequency.

32. An uplink terminal to perform an uplink communication with a base station, the uplink terminal comprising:

a transmitter to transmit a reference signal to a downlink terminal so that the downlink terminal measures an interference channel formed between the uplink terminal and the downlink terminal;

a receiver to receive, from the base station, control information regarding a radio resource for the uplink terminal if the base station selects, from a plurality of terminals based on the measured interference channel, the uplink terminal and the downlink terminal; and

a processor to perform the uplink communication with the base station using the radio resource for the uplink terminal;

wherein the radio resource for the uplink terminal at least partially overlaps a radio resource for the downlink terminal in both time and frequency.