CN-115987361-B - Baseband unit and method thereof and method of radio unit

Abstract

The application provides a baseband unit and a method thereof and a method of a radio unit. A method performed by a baseband unit, the method comprising maintaining a first physical layer, receiving a reference signal from a radio unit, wherein the radio unit is configured to maintain a second physical layer and receive signals via a plurality of antennas, the second physical layer being located at a lower layer in a communication protocol than the first physical layer, performing channel estimation based on the reference signal, and transmitting weight information to the radio unit regarding receive antenna weights multiplied by the radio unit with signals received via the plurality of antennas, wherein the baseband unit and the radio unit are each one of a plurality of devices constituting a base station, and wherein the baseband unit and the radio unit are physically separated and linked by an interface requiring a frequency band.

Inventors

• IWASAKI MOTOYA

Assignees

• 日本电气株式会社

Dates

Publication Date

20260512

Application Date

20180314

Priority Date

20170322

Claims (20)

1. 1.A method performed by a baseband unit, the method comprising: maintaining the first physical layer; Receiving a reference signal from a radio unit, wherein the radio unit is configured to maintain a second physical layer and receive signals via a plurality of antennas, the second physical layer being located at a lower layer in a communication protocol than the first physical layer; Channel estimation based on the reference signal, and Transmitting weight information on a reception antenna weight to the radio unit, the reception antenna weight being multiplied by signals received via the plurality of antennas by the radio unit, Wherein the baseband unit and the radio unit are each one of a plurality of devices constituting a base station, and Wherein the baseband unit and the radio unit are physically separated and the baseband unit and the radio unit are linked by an interface requiring a frequency band.
2. 2. The method of claim 1, wherein the weight information is information indicating the receive antenna weights.
3. 3. The method of claim 2, wherein the weight information includes information indicating respective weights included in the receive antenna weights.
4. 4. The method of claim 2, wherein, The receiving antenna weight is one of a plurality of predetermined receiving antenna weight sets, and The weight information is an index indicating the one set of receive antenna weights.
5. 5. The method of claim 1, wherein the weight information is generated based on a channel estimate calculated by the channel estimation.
6. 6. The method of claim 1, further comprising: The weight information and information relating to the use of the receive antenna weights are transmitted to the radio unit.
7. 7. The method of claim 6, wherein the information related to use of the receive antenna weights comprises frequency information related to frequencies at which the receive antenna weights are used.
8. 8. The method of claim 6, wherein the information related to the use of the receive antenna weights comprises time information related to a time at which the receive antenna weights were used.
9. 9. The method of claim 1, wherein the reference signal is a reference signal transmitted during a particular time period in a time frame.
10. 10. The method of claim 9, wherein, The time frame is a radio frame, and The specific time period is a specific symbol.
11. 11. The method of claim 1, wherein the reference signal is a sounding reference signal, SRS, or a demodulation reference signal, DMRS.
12. 12. The method of claim 1, further comprising: the weight information is generated based on the reference signal.
13. 13. The method of claim 1, further comprising: signals of one or more layers generated by the radio unit by multiplying signals received via the plurality of antennas with the receive antenna weights are demodulated and decoded.
14. 14. The method of claim 1, further comprising: other weight information regarding transmit antenna weights used by the radio unit to generate signals to be transmitted via the plurality of antennas is transmitted to the radio unit, the other weight information being generated based on the reference signals.
15. 15. The method of claim 1, wherein the receive antenna weights are antenna weights that the radio unit also uses to generate signals to be transmitted via the plurality of antennas.
16. 16. The method of claim 14, wherein the radio unit is a device for time division duplex, TDD, mode of communication.
17. 17. The method of claim 1, wherein the receive antenna weights are weights by which the radio unit multiplies signals from a terminal device, the signals received via the plurality of antennas.
18. 18. The method of claim 1, further comprising: Transmitting to the radio unit other weight information related to the transmit antenna weight, and Wherein the other weight information related to the transmission antenna weight is information in the same format as that of the weight information related to the reception antenna weight.
19. 19. A method performed by a radio unit, comprising: Maintaining a second physical layer at a layer lower than the first physical layer in the communication protocol; Receiving signals via a plurality of antennas; transmitting a reference signal to be used by a baseband unit for channel estimation to the baseband unit, wherein the baseband unit is configured to maintain the first physical layer; Receiving weight information related to the weight of the receiving antenna from the baseband unit, and Multiplying signals received via the plurality of antennas with the receive antenna weights, Wherein the baseband unit and the radio unit are each one of a plurality of devices constituting a base station, and Wherein the baseband unit and the radio unit are physically separated and the baseband unit and the radio unit are linked by an interface requiring a frequency band.
20. 20. A baseband unit comprising: a memory storing instructions, and One or more processors configured to execute the instructions to: maintaining the first physical layer; Receiving a reference signal from a radio unit, wherein the radio unit is configured to maintain a second physical layer and receive signals via a plurality of antennas, the second physical layer being located at a lower layer in a communication protocol than the first physical layer; Channel estimation based on the reference signal, and Transmitting weight information on a reception antenna weight multiplied by signals received via the plurality of antennas to the radio unit, wherein the baseband unit and the radio unit are each one of a plurality of devices constituting a base station, and Wherein the baseband unit and the radio unit are physically separated and the baseband unit and the radio unit are linked by an interface requiring a frequency band.

Description

Baseband unit and method thereof and method of radio unit The present application is a divisional application of patent application of the application having the application date of 2018, 3-14, and the application number of 201880019108.1, and the title of "first communication device, second communication device, method, program, recording medium, and system". Technical Field The present invention relates to a first communication device, a second communication device, a method, a program, a recording medium, and a system. Background With further development of mobile communication, the data transmission rate is increased at a higher rate than the available band extension. Therefore, as an effective technique, beam forming using a multiple antenna (multi-ELEMENT ANTENNA) that allows to increase the data transmission rate of each frequency is considered. In this beamforming, a beam for reception (and transmission) is formed based on channel estimation values that can be acquired from the reception signals of the respective antenna elements included in the multiple antennas. For example, patent document 1 discloses that a base station determines a transmission beamforming weight and performs transmission beamforming, and a terminal device determines a reception beamforming weight and performs reception beamforming. For example, patent document 2 discloses that a terminal device determines a transmission antenna weight and a reception antenna weight based on a reference signal from a base station, and reports information about these weights to the base station. Patent document 3 discloses an example of the configuration of a base station separated into a Remote Radio Unit (RRU) and a Base Band Unit (BBU). Prior art literature Patent literature WO 2016/152916 in patent document 1 WO 2016/207929 Patent document 3 us 2014/0226736A1 Disclosure of Invention Problems to be solved by the invention For example, as described in patent document 3, a base station may be separated into a device (e.g., RRU) for receiving a signal via an antenna, and other devices (e.g., BBU), and the like. In this case, for example, which device performs processing such as channel estimation, generation of antenna weights, multiplication of antenna weights, and the like, which may affect the circuit scale of the device (e.g., RRU) and the frequency band of the interface between the devices. However, in patent document 3, which device performs these processes is not discussed. Therefore, the technique described in patent document 3 cannot enable reduction of both the circuit scale of the device and the frequency band of the interface between the devices. An exemplary object of the present invention is to provide a first communication device and a second communication device that enable reduction of both a circuit scale of a device for receiving a signal via an antenna and a frequency band of an interface between the devices. Solution for solving the problem The first communication device according to an example aspect of the present invention includes a reception processing unit configured to receive channel-related information on channels of signals received via a plurality of antennas from a second communication device for receiving signals via the plurality of antennas, and a transmission processing unit configured to transmit weight information generated based on the channel-related information to the second communication device, the weight information being related to a reception antenna weight by which the second communication device multiplies signals received via the plurality of antennas. The second communication device according to an example aspect of the present invention includes a radio communication processing unit configured to receive signals via a plurality of antennas, a transmission processing unit configured to transmit channel-related information on channels of signals received via the plurality of antennas to a first communication device, and a reception processing unit configured to receive weight information on reception antenna weights from the first communication device, the weight information being generated based on the channel-related information, wherein the radio communication processing unit is configured to multiply signals received via the plurality of antennas with the reception antenna weights. A first method according to an example aspect of the invention includes receiving, from a communication device for receiving signals via a plurality of antennas, channel-related information relating to channels of the signals received via the plurality of antennas, and transmitting, to the communication device, weight information relating to receive antenna weights, wherein the communication device multiplies the signals received via the plurality of antennas with the receive antenna weights, the weight information being generated based on the channel-related information. A second method according to an example asp