# US 2021/0345137 A1 · Radio access networks

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- Number: US 2021/0345137 A1
- Document ID: US20210345137A1
- Status: Published application
- Kind: A1
- Application number: 17/374,666
- Filed: 2021-07-13
- Published: 2021-11-04
- Earliest claimed: 2013-02-07
- Assignees: CommScope Technologies LLC
- Applicants: CommScope Technologies LLC
- Inventors: Vedat Eyuboglu; Arthur J. Barabell
- Web page: https://patentgrep.com/patent/US20210345137A1

## CPC

- H04W 24/02: Arrangements for optimising operational condition
- H04B 7/04: using two or more spaced independent antennas
- H04B 7/15507: {Relay station based processing for cell extension or control of coverage area, (network planning with network coordinated processing with regard to cell extension H04W16/26; network topologies using dedicated repeater stations H04W84/047; terminal devices adapted for relaying to or from an other terminal H04W88/04)}
- H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
- H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence)
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 12/4641: {Virtual LANs, VLANs, e.g. virtual private networks [VPN] (LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272)}
- H04L 27/2602: {Signal structure}
- H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]}
- H04L 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L 69/28: Timers or timing mechanisms used in protocols
- H04W 16/26: Cell enhancers {or enhancement}, e.g. for tunnels, building shadow
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/54: based on quality criteria
- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- H04L 2101/622: Layer-2 addresses, e.g. medium access control [MAC] addresses
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W 88/085: {Access point devices with remote components}
- H04W 88/12: Access point controller devices
- H04W 88/16: Gateway arrangements
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- 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)

## Abstract

Among other things, a communication system comprising at least one remote unit and controller is described. The at least one remote unit wirelessly exchanges radio frequency (RF) signals with mobile devices. Each RF signal comprises information destined for, or originating from, at least one of the mobile devices. The at least two remote units and the controller communicate baseband data corresponding to the information across an intermediate network. The at least two remote units each implement at least some physical layer processing for an air interface used to wirelessly communicate with the subscriber devices. The controller is configured to perform at least some receive signal processing using combined data resulting from combining at least some of the baseband data communicated from more than one of the at least two remote units.

## Claims

### Claim 1

A communication system comprising:
at least two remote units to wirelessly exchange radio frequency (RF) signals with subscriber devices, each RF signal comprising information that is destined for, or originating from, at least one of the subscriber devices; and
a controller communicatively coupled to the at least two remote units;
wherein the at least two remote units and the controller communicate baseband data corresponding to the information across an intermediate network;
wherein the at least two remote units each implement at least some physical layer processing for an air interface used to wirelessly communicate with the subscriber devices; and
wherein the controller is configured to perform at least some receive signal processing using combined data resulting from combining at least some of the baseband data communicated from more than one of the at least two remote units.

### Claim 2 (depends on 1)

The communication system of claim 1, wherein the subscriber devices comprise mobile devices.

### Claim 3 (depends on 1)

The communication system of claim 1, wherein the controller is configured to combine said at least some of the baseband data communicated from said more than one of the at least two remote units.

### Claim 4 (depends on 3)

The communication system of claim 3, wherein the controller combines by performing Maximal Ratio Combining (MRC), Interference Rejection Combining (IRC), or Successive Interference Cancellation (SIC) across the baseband data received at two or more of the remote units.

### Claim 5 (depends on 1)

The communication system of claim 1, wherein each of the at least two remote units implement the at least some physical layer processing by removing cyclic prefix from time-domain IQ samples in received OFDM symbols.

### Claim 6 (depends on 5)

The communication system of claim 5, wherein each of the at least two remote units implement the at least some physical layer processing by further applying Fast Fourier Transform (FFT) to produce frequency-domain IQ symbols.

### Claim 7 (depends on 1)

The communication system of claim 1, wherein each of the at least two remote units implement the at least some physical layer processing by quantizing frequency-domain IQ symbols in Ethernet frames to send to the controller.

### Claim 8 (depends on 7)

The communication system of claim 7, wherein the quantizing is tailored based on whether uplink communications are physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), sounding reference signal (SRS), or physical random access channel (PRACH) communications.

### Claim 9 (depends on 1)

The communication system of claim 1, wherein each of the at least two remote units implement the at least some physical layer processing by converting received time-domain IQ symbols received on a physical random access channel (PRACH) into a lower-rate time-domain sequence using a time-domain frequency shift, decimating the lower-rate time-domain sequence, and converting a resulting sequence into frequency domain by applying Fast Fourier Transform (FFT).

### Claim 10 (depends on 1)

The communication system of claim 1, wherein each of the at least two remote units implement the at least some physical layer processing by applying inverse FFT (IFFT) and inserting cyclic prefixes before sending RF signals to the subscriber devices.

### Claim 11 (depends on 10)

The communication system of claim 10, wherein each of the at least two remote units implement the at least some physical layer processing by further reconstructing quantized frequency-domain IQ symbols from the controller.

### Claim 12 (depends on 1)

The communication system of claim 1, wherein the intermediate network is an Ethernet network.

### Claim 13

A method comprising:
wirelessly exchanging, by at least two remote units, radio frequency (RF) signals with subscriber devices, each RF signal comprising information that is destined for, or received from, at least one of the subscriber devices;
communicating baseband data corresponding to the information between a controller and the at least two remote units across an intermediate network;
performing, at the at least two remote units, at least some physical layer processing for an air interface used to wirelessly communicate with the subscriber devices; and
performing, at the controller, at least some receive signal processing using combined data resulting from combining at least some of the baseband data communicated from more than one of the at least two remote units.

### Claim 14 (depends on 13)

The method of claim 13, wherein the subscriber devices comprise mobile devices.

### Claim 15 (depends on 13)

The method of claim 13, further comprising combining, at the controller, said at least some of the baseband data communicated from said more than one of the at least two remote units.

### Claim 16 (depends on 15)

The method of claim 15, wherein the combining comprises performing Maximal Ratio Combining (MRC), Interference Rejection Combining (IRC), or Successive Interference Cancellation (SIC) across the baseband data received at two or more of the remote units.

### Claim 17 (depends on 13)

The method of claim 13, wherein the at least some physical layer processing comprises removing cyclic prefix from time-domain IQ samples in received OFDM symbols.

### Claim 18 (depends on 17)

The method of claim 17, wherein the at least some physical layer processing further comprises applying Fast Fourier Transform (FFT) to produce frequency-domain IQ symbols.

### Claim 19 (depends on 13)

The method of claim 13, wherein the at least some physical layer processing comprises quantizing frequency-domain IQ symbols in Ethernet frames to send to the controller.

### Claim 20 (depends on 19)

The method of claim 19, wherein the quantizing is tailored based on whether uplink communications are physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), sounding reference signal (SRS), or physical random access channel (PRACH) communications.

### Claim 21 (depends on 13)

The method of claim 13, wherein the at least some physical layer processing comprises converting received time-domain IQ symbols received on a physical random access channel (PRACH) into a lower-rate time-domain sequence using a time-domain frequency shift, decimating the lower-rate time-domain sequence, and converting a resulting sequence into frequency domain by applying Fast Fourier Transform (FFT).

### Claim 22 (depends on 13)

The method of claim 13, wherein the at least some physical layer processing comprises applying inverse FFT (IFFT) and inserting cyclic prefixes before sending RF signals to the subscriber devices.

### Claim 23 (depends on 22)

The method of claim 22, wherein the at least some physical layer processing comprises reconstructing quantized frequency-domain IQ symbols from the controller.

### Claim 24 (depends on 13)

The method of claim 13, wherein the intermediate network is an Ethernet network.