# US 2019/0173531 A1 · Multi-cell coordination system and method

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- Number: US 2019/0173531 A1
- Document ID: US20190173531A1
- Status: Published application
- Kind: A1
- Application number: 15/853,676
- Filed: 2017-12-22
- Published: 2019-06-06
- Earliest claimed: 2017-12-01
- Assignees: Industrial Technology Research Institute
- Applicants: Industrial Technology Research Institute
- Inventors: Sheng-Bang CHANG; Chun-Nan LIU; Jen-Yuan HSU
- Web page: https://patentgrep.com/patent/US20190173531A1

## CPC

- H04B 7/022: Site diversity; Macro-diversity (using two or more spaced independent antennas H04B7/04)
- H04J 11/003: {at the transmitter (transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615)}
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04W 88/085: {Access point devices with remote components}
- H04J 2011/0009: {with FDM/FDMA}
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A multi-cell coordination system and method are provided in the disclosure. The multi-cell coordination system includes a plurality of Radio Frequency Nodes (RFNs) and a Baseband Processing Node (BPN). Each of the RFNs includes a baseband circuit, a radio frequency (RF) circuit, and a plurality of transmission ports. The RF circuit is electrically connected to the baseband circuit and to one or more antennas. The transmission ports of each RFN are configured to transmit data to the other RFNs and to receive data provided by the other RFNs. The BPN centralizes and performs layer 2 and layer 3 functions of each cell.

## Claims

### Claim 1

A multi-cell coordination system, comprising:
a plurality of radio frequency nodes (RFNs), wherein each of the RFNs comprises:
a baseband circuit;
a radio frequency (RF) circuit, electrically connected to the baseband circuit; and
a plurality of transmission ports, configured in the RF circuit and configured to transmit data to other RFNs of the plurality of RFNs and receive data provided by the other RFNs of the plurality of RFNs; and
a baseband processing node (BPN), centralizing and performing layer 2 and layer 3 functions of each cell.

### Claim 2 (depends on 1)

The multi-cell coordination system of claim 1, further comprising:
a coordination server, electrically connected to the BPN to assign data of a plurality of users to the plurality of RFNs.

### Claim 3 (depends on 1)

The multi-cell coordination system of claim 1, wherein each of the plurality of RFNs is operated in a time-division duplexing mode.

### Claim 4 (depends on 2)

The multi-cell coordination system of claim 2, wherein the baseband circuit further comprises:
a precoder;
an OFDM symbol constructor;
a combiner; and
an IFFT circuit,
wherein the plurality of transmission ports of each of the plurality of RFNs are configured in an output-end of the precoder, an output-end of the OFDM symbol constructor, or an output-end of the IFFT circuit.

### Claim 5 (depends on 4)

The multi-cell coordination system of claim 4, wherein the plurality of transmission ports comprise a first transmission port and a second transmission port, wherein the first transmission port transmits a first data to the other RFNs and the second transmission port receives a second data provided by the other RFNs.

### Claim 6 (depends on 5)

The multi-cell coordination system of claim 5, further comprising:
a switch, wherein each of the plurality of RFNs transmits the first data from the first transmission port to the switch to provide the first data to the other RFNs, and each of the plurality of RFNs receives the second data provided by the other RFNs through the second transmission port, wherein the second data provided by the other RFNs is transmitted from the switch to the second transmission port.

### Claim 7 (depends on 6)

The multi-cell coordination system of claim 6, wherein the switch is independently configured outside of the plurality of RFNs and the BPN or configured in one of the plurality of RFNs or the BPN.

### Claim 8 (depends on 5)

The multi-cell coordination system of claim 5, wherein each of the plurality of RFNs directly transmits the first data to the other RFNs through the first transmission port, and each of the plurality of RFNs directly receives the second data provided by the other RFNs through the second transmission port.

### Claim 9 (depends on 5)

The multi-cell coordination system of claim 5, wherein the combiner combines a third data output by the precoder or the OFDM symbol constructor with the second data provided by other RFNs in a frequency domain.

### Claim 10 (depends on 5)

The multi-cell coordination system of claim 5, wherein the combiner combines a third data output by the IFFT circuit with the second data provided by other RFNs in a time domain.

### Claim 11 (depends on 1)

The multi-cell coordination system of claim 1, wherein the plurality of RFNs is integrated in a circuit board.

### Claim 12 (depends on 2)

The multi-cell coordination system of claim 2, wherein the coordination server respectively assigns the data of the users to each of the plurality of RFNs.

### Claim 13 (depends on 2)

The multi-cell coordination system of claim 2, wherein the coordination server assigns the data of one of the users to more than one RFN of the plurality of RFNs.

### Claim 14 (depends on 2)

The multi-cell coordination system of claim 2, wherein the coordination server assigns the data of more than one of the users to one of the plurality of RFNs.

### Claim 15

A multi-cell coordination method, comprising:
assigning data of a plurality of users to a plurality of radio frequency nodes (RFNs);
processing, by each of the plurality of RFNs, the assigned data to generate a first data and a third data corresponding to each of the plurality of RFNs; and
transmitting the first data to other RFNs of the plurality of RFNs and receiving a second data provided by the other RFNs through a plurality of transmission ports of each of the plurality of RFNs.

### Claim 16 (depends on 15)

The multi-cell coordination method of claim 15, wherein the plurality of transmission ports comprise a first transmission port and a second transmission port, wherein the first transmission port transmits the first data to the other RFNs and the second transmission port receives the second data provided by the other RFNs.

### Claim 17 (depends on 16)

The multi-cell coordination method of claim 16, further comprising:
transmitting, by each of the plurality of RFNs, the first data from the first transmission port to a switch to provide the first data to the other RFNs; and
receiving, by each of the plurality of RFNs, the second data provided by the other RFNs through the second transmission port, wherein the second data provided by the other RFNs is transmitted from the switch to the second transmission port.

### Claim 18 (depends on 16)

The multi-cell coordination method of claim 16, further comprising:
directly transmitting, by each of the plurality of RFNs, the first data to the other RFNs through the first transmission port; and
directly receiving, by each of the plurality of RFNs, the second data provided by the other RFNs through the second transmission port.

### Claim 19 (depends on 15)

The multi-cell coordination method of claim 15, further comprising:
combining the third data output by a precoder or an OFDM symbol constructor of each of the plurality of RFNs with the second data provided by other RFNs in a frequency domain.

### Claim 20 (depends on 15)

The multi-cell coordination method of claim 15, further comprising:
combining the third data output by a IFFT circuit of each of the plurality of RFNs with the second data provided by other RFNs in a time domain.

### Claim 21 (depends on 15)

The multi-cell coordination method of claim 15, further comprising:
respectively assigning the data of the users to each of the plurality of RFNs.

### Claim 22 (depends on 15)

The multi-cell coordination method of claim 15, further comprising:
assigning the data of one of the users to more than one RFN of the plurality of RFNs.

### Claim 23 (depends on 15)

The multi-cell coordination method of claim 15, further comprising:
assigning the data of more than one of the users to one of the plurality of RFNs.