USRE47466E1 - Systems and methods for IP communication over a distributed antenna system transport - Google Patents
Systems and methods for IP communication over a distributed antenna system transport Download PDFInfo
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- USRE47466E1 USRE47466E1 US15/436,534 US201715436534A USRE47466E US RE47466 E1 USRE47466 E1 US RE47466E1 US 201715436534 A US201715436534 A US 201715436534A US RE47466 E USRE47466 E US RE47466E
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
Definitions
- a Distributed Antenna System is a network of spatially separated antenna nodes connected to a common node via a transport medium that provides wireless service within a geographic area or structure.
- Common wireless communication system configurations employ a host unit as the common node, which is located at a centralized location (for example, at a facility that is controlled by a wireless service provider).
- the antenna nodes and related broadcasting and receiving equipment located at a location that is remote from the host unit (for example, at a facility or site that is not controlled by the wireless service provider), are also referred to as “remote units.”
- Radio frequency (RF) signals are communicated between the host unit and one or more remote units.
- the host unit is typically communicatively coupled to one or more base stations (for example, via wired connection or via wireless connection) which allow bidirectional communications between wireless subscriber units within the DAS service area and communication networks such as, but not limited to, cellular phone networks, the public switch telephone network (PSTN) and the Internet.
- base stations for example, via wired connection or via wireless connection
- PSTN public switch telephone network
- a DAS can thus provide, by its nature, an infrastructure within a community that can scatter remote units across a geographic area thus providing wireless services across that area.
- FIG. 1 is a block diagram of a distributed antenna system (DAS) of one embodiment of the present invention
- FIG. 2 is a block diagram of a remote unit of one embodiment of the present invention.
- FIG. 3 is a block diagram of a host unit of one embodiment of the present invention.
- FIG. 4 illustrates a superframe structure of one embodiment of the present invention.
- FIG. 5 illustrates a method of one embodiment of the present invention.
- Embodiments of the present invention provide point-to-point Ethernet connections (100 Base-T, for example) between elements of a distributed antenna system by adapting the digital radio frequency (RF) transport medium to further carry internet protocol data traffic simultaneously with the RF traffic.
- Embodiments of the present invention enable installation of internet protocol devices at remote locations (for example, to extend a Local Area Network (LAN)/IP network into remote areas, or establish various services at remote locations that benefit from having IP network connectivity).
- Internet protocol devices may thus include networking devices such as switches, routers, and wireless access points (for WiFi, WiMAX, LTE, for example) or cameras, sensors, audio and/or video devices for security, distributing announcements, warnings or advertising.
- the Internet Protocol device is a mobile phone locator such as described in the '1075 Application herein incorporated by reference.
- a mobile phone locator such as described in the '1075 Application herein incorporated by reference.
- FIG. 1 is a block diagram of a distributed antenna system (DAS) 100 of one embodiment of the present invention.
- DAS 100 includes a host unit 102 and a plurality of remote units 106 .
- host units 102 and remote units 106 are interconnected via fiber optic cable as indicated in FIG. 1 to form a bidirectional communication link network comprising a plurality of point-to-point communication links shown at 130 .
- host units 102 and remote units 106 may be interconnected via coaxial cable, or a combination of both coaxial cable and fiber optic cable.
- host units 102 and remote units 106 may be interconnected via wireless technology such as, but not limited to, microwave and e-band communication.
- Remote units 106 each house electronic devices and systems used for wirelessly transmitting and receiving modulated radio frequency (RF) communications via antenna 107 with one or more mobile subscriber units 108 .
- Host unit 102 is coupled to at least one base transceiver station (BTS) 110 often referred to as a base station.
- BTS 110 communicates voice and other data signals between the respective host unit 102 and a larger communication network via a gateway 124 coupled to a telephone system network 122 (for example, the public switched telephone network and/or wireless service provider networks) and an internet protocol (IP) network 124 , such as the Internet.
- IP internet protocol
- DAS 100 comprises part of a cellular telephone network and subscriber units 108 are cellular telephones.
- Downlink RF signals are received from the BTS 110 at the host unit 102 , which the host unit 102 uses to generate one or more downlink transport signals for transmitting to one or more of the remote units 106 .
- Each such remote unit 106 receives at least one downlink transport signal and reconstructs the downlink RF signals from the downlink transport signal and causes the reconstructed downlink RF signals to be radiated from a remote antenna 107 coupled to or included in that remote unit 106 .
- a similar process is performed in the uplink direction.
- Uplink RF signals received at one or more remote units 106 from subscriber 108 are used to generate respective uplink transport signals that are transmitted from the respective remote units 106 to the host unit 102 .
- the host unit 102 receives and combines the uplink transport signals transmitted from the multiple remote units 106 .
- the host unit 102 communicates the combined uplink RF signals to the BTS 110 over a broadband medium.
- DAS 100 comprises a digital DAS transport meaning that the downlink and uplink transport signals transmitted between host unit 102 and remote units 106 over communication links 130 are generated by digitizing the downlink and uplink RF signals, respectively.
- the downlink and uplink transport signals are not analog RF signals but instead are digital data signals representing digital RF samples of a modulated RF signal.
- host unit 102 will generate baseband digital samples of the modulated 900 MHz RF signal from BTS 110 , which are then distributed by host unit 102 to the remote units 106 .
- an all-digital BTS may generate baseband digital samples directly.
- the digital samples of the modulated RF signal are converted from digital into an analog RF signal to be wirelessly radiated from the antennas 107 .
- the uplink analog RF signals received at remote unit 106 are sampled to generate RF data samples for the uplink transport signals.
- BTS 110 , host unit 102 and remote units 106 each accommodate processing communication signals for multiple bands and multiple modulate schemes simultaneously.
- the digital transport between host unit 102 and each remote units 106 includes sufficient bandwidth (that is, in excess of what is necessary to transport the digitized RF data samples) to implement an Ethernet pipe (100 Base-T) between each remote unit 106 and the host unit 102 for facilitating supplemental Internet Protocol formatted data communications.
- the Ethernet pipe provides a bandwidth of at least 100M bits/sec.
- RF signals are often transported at intermediate frequencies (IF) or baseband. Therefore, within the context of this application, the terms “digital RF”, “digitized RF data”, “digital RF signal”, “digital RF samples”, “digitized RF samples” and “digitized RF signals” are understood to include signals converted to IF and baseband frequencies.
- FIG. 2 is a block diagram of a remote unit 200 of one embodiment of the present invention such as the remote units 106 discussed with respect to FIG. 1 .
- Remote unit 200 includes a serial radio frequency (SeRF) module 220 , a digital to analog radio frequency transceiver (DART) module 208 , a remote DART interface board (RDI) 224 , a linear power amplifier 210 , antenna 212 , a duplexer 211 , a low noise amplifier 214 and an Internet Protocol device (IPD) 216 .
- SeRF modules and DART modules and Internet Protocol (IP) devices described herein are realized using discrete RF components, FPGAs, ASICs, digital signal processing (DSP) boards, or similar devices.
- DART module 208 provides bi-directional conversion between analog RF signals and digital sampled RF for the downlink and uplink transport signals transmitted between host unit 102 and remote units 106 .
- DART module 208 receives an incoming analog RF signal from subscriber unit 108 and samples the analog RF signal to generate a digital data signal for use by SeRF module 220 .
- Antenna 212 receives the wireless RF signal from subscriber 108 which passes the RF signal to DART module 208 via low noise amplifier 214 .
- DART module 208 receives digital sampled RF data from SeRF module 220 , up converts the sampled RF data to a broadcast frequency, and converts the digital RF samples to analog RF for wireless transmission.
- DART module 208 After a signal is converted to an analog RF signal by DART module 208 , the analog RF signal is sent to linear power amplifier 210 for broadcast via antenna 212 .
- Linear power amplifier 210 amplifies the RF signal received from DART module 208 for output through duplexer 211 to antenna 212 .
- Duplexer 211 provides duplexing of the signal which is necessary to connect transmit and receive signals to a common antenna 212 .
- low noise amplifier 214 is integrated into duplexer 211 .
- DART modules may function to optionally convert the digital RF samples into intermediate frequency (IF) samples instead of, or in addition to, baseband digital samples.
- IF intermediate frequency
- DART modules in a remote unit are specific for a particular frequency band.
- a single DART module operates over a defined band regardless of the modulation technology being used.
- frequency band adjustments in a remote unit can be made by replacing a DART module covering one frequency band with a DART module covering a different frequency band.
- DART module 208 is designed to transmit 850 MHz cellular transmissions.
- DART module 208 transmits 1900 MHz PCS signals.
- DART module 208 Some of the other options for a DART module 208 include, but are not limited to, Nextel 800 band, Nextel 900 band, PCS full band, PCS half band, BRS, WiMax, Long Term Evolution (LTE), and the European GSM 900, GSM 1800, and UMTS 2100.
- remote unit 200 is configurable to any of the above frequency bands and technologies as well as any new technologies or frequency bands that are developed.
- a single remote unit may be configured to operate over multiple bands by possessing multiple DART modules. The present discussion applies to such multiple band remote units, even though the present examples focuses on a the operation of a single DART module for simplicity.
- SeRF module 220 is coupled to RDI 224 .
- RDI 224 has a plurality of connectors each of which is configured to receive a pluggable DART module 208 and connect DART module 208 to SeRF module 220 .
- RDI 224 is a common interface that is configured to allow communication between SeRF module 220 and different varieties of DART modules 208 .
- RDI 204 is a passive host backplane to which SeRF module 220 also connects.
- RDI 224 is integrated with SeRF module 220 .
- RDI 224 provides separate connection interfaces allowing each DART module to communicate RF data samples with SeRF module 220 .
- FIG. 2 illustrates a single SeRF module connected to a single RDI, embodiments of the present invention are not limited to such.
- a SeRF module may connect to multiple RDIs, each of which can connect to multiple DARTS.
- a SeRF module can connect to up to 3 RDIs, each of which can connect to up to 2 DARTs.
- SeRF module 220 provides bi-directional conversion between a serial stream of RF, IF or baseband data samples (a SeRF stream) and a high speed optical serial data stream.
- SeRF module 220 receives an incoming SeRF stream from DART modules 208 and sends a serial optical data stream over communication links 130 to host unit 102 .
- SeRF module 220 receives an optical serial data stream from host unit 102 and provides a SeRF stream to DART modules 208 .
- Remote unit 200 further includes an internet protocol device (IPD) 216 .
- IPD 216 is coupled to SeRF module 220 via an interface 222 that provides bidirectional access to a point-to-point Ethernet pipe established between remote unit 200 and the host unit 102 over the serial optical data stream.
- interface 222 is a receptacle for a standard 8 Position 8 Contact (8P8C) modular plug and category 5/5e cable.
- IPD 216 may include any device designed to network using an Ethernet connection.
- IPD 216 may comprise a networking devices such a switch, router, and/or wireless access point (for WiFi or WiMAX, for example).
- IPD 216 is a data collection device such as a weather station collecting weather related data such as, but not limited to, temperature, relative humidity, wind speed and direction, precipitation, and the like.
- IPD 216 may include any number of other data collection devices such as a surveillance camera, a motion, heat or vibration sensor or a subscriber unit locator.
- IPD 216 formats data it collects for transmission over an internet protocol (IP) connection and then outputs the data to the SeRF module 220 via interface 222 which in turn routes data over the Ethernet pipe to the host unit 102 .
- IP internet protocol
- IPD 216 is a data distribution device for distributing announcements, warnings or advertising.
- IPD 216 may comprise a public announcement load speaker, sirens, or liquid crystal diode (LCD) display. Further IPD may support two way interactive messaging, chat, tele/video conferencing applications, and the like.
- FIG. 2 illustrates a single DART module coupled to a SeRF module
- a single remote unit housing may operate over multiple bands and thus include multiple DART modules.
- the systems illustrated in FIG. 2 would simply be replicated once for each band.
- a SeRF module also allows multiple DART modules to operate in parallel to communicate high speed optical serial data streams over a communication link with the host unit.
- a SeRF module actively multiplexes the signals from multiple DART modules (each DART module processing a different RF band) such that they are sent simultaneously over a single transport communication link.
- a SeRF module presents a clock signal to each DART module to which it is coupled to ensure synchronization.
- FIG. 3 is a block diagram illustrating a host unit (shown generally at 300 ) of one embodiment of the present invention such as the host unit 102 discussed with respect to FIG. 1 .
- Multiple remote units 306 are coupled to host unit 300 , as described with respect to FIG. 1 , to form a digital DAS.
- Host unit 300 includes a host unit digital to analog radio frequency transceiver (DART) module 308 and a host unit serial radio frequency (SeRF) module 320 .
- SeRF module 320 provides bi-directional conversion between a serial stream of RF data samples (a SeRF stream) and the multiple high speed optical serial data streams to and from the remote units 306 .
- Each serial optical data stream includes a digital transport for communicating downlink and uplink transport RF signals as well as an Ethernet pipe between each remote unit 306 and host unit 300 .
- SeRF module 320 receives incoming serial optical data streams from a plurality of remote units and converts each into a serial stream of digitized baseband RF data samples, which are summed into a broadband stream of RF data samples.
- DART module 308 provides a bi-directional interface between SeRF module 320 and one or more base stations, such as BTS 110 . As with the remote units, when host unit 320 operates over multiple bands with multiple base stations, a separate DART module 308 is provided for each frequency band.
- host unit 300 also maintains an Ethernet pipe with at least one base station (such as BTS 110 ) which provides access to at least one Internet gateway.
- Host unit 300 further includes an Ethernet port interface 324 for coupling an Internet Protocol Device (IPD) 330 to SeRF module 320 via an Ethernet link 325 .
- Ethernet link 325 may include a local area network (LAN), wide area network (WAN) having at least one network switch for routing data between interface 324 and IPD 330 .
- IPD 330 may be an internet switch, router, or any of the IP devices discussed above with respect to IPD 216 .
- Ethernet port interface 324 provides access to the Ethernet Pipes established between host unit 300 and one or more of the multiple remote units 306 .
- a single 8 Position 8 Contact (8P8C) modular plug Ethernet port interface 324 provides access for communication via a virtual Ethernet connection with each multiple remote unit's Ethernet port interface (such as interface 222 ).
- Ethernet port interface 324 provides multiple 8 Position 8 Contact (8P8C) modular plug connection points which each form a point-to-point virtual Ethernet connection with a specific one of the multiple remote units 306 .
- IP data received via interface 222 and digitized RF data from DART module 208 are both pushed into SeRF 220 which produces the uplink transport signal that is communicated to the host unit 120 via communication links 130 .
- SeRF 220 performs multiplexing in the time domain to route both the IP data and the RF data into time slots within frames communicated to host unit 120 .
- SeRF 220 de-multiplexes IP data and RF data from within frames received from host unit 120 .
- RF data is routed to the DART module 208 while IP data is routed to Ethernet interface 222 .
- the host unit SeRF 320 similarly multiplexes and de-multiplexes IP data and RF data (via communication links 130 ) to route IP data to and from interface 324 and RF data to and from the host unit DART 308 .
- FIG. 4 illustrates one embodiment of a superframe 400 , which may be used for either upstream or downstream communications between remote units 106 and host unit 102 via communication links 130 .
- the particular superframe 400 shown comprises 12 frames (shown at 420 - 1 to 420 - 12 ) with each frame divided into 16 timeslots (shown generally at 410 ).
- 12 frames shown at 420 - 1 to 420 - 12
- 16 timeslots shown generally at 410 .
- this particular configuration of 12 frames of 16 timeslots is for illustrative purposes only and that embodiments of the present invention may be practiced with superframes having different numbers of frames and timeslots.
- each RF data sample carried over the digital transport of the DAS utilizes 15 of 16 available bits within a single timeslot (shown generally at 412 , for example).
- the SeRF module 220 mulitplexes IP data into the remaining bits of each time slot. That is, for each timeslot carrying RF data, SeRF fills the 16 th bit with IP data.
- the SeRF module assembling superframe 400 thus utilizes the remaining overhead in each time slot to transport the IP data along with the RF data sample.
- the ratio and/or number of bits used to carry an RF data sample verses the total number of available bits per timeslot may vary.
- an RF data sample may utilize 17 of 18 available bits in a timeslot. The SeRF may then fill the 18 th bit with IP data. In another alternate embodiment, an RF data sample may utilize 15 of 18 available bits in a timeslot. The SeRF may then fill one or all of the 16 th , 17 th , and/or 18 th bits with IP data.
- the SeRF module receiving superframe 400 accordingly separates the IP data from each timeslot to reassemble standard IP data packets. It is not necessary that every timeslot of every frame will carry RF data. In other words, in some implementations, some timeslot of superframe 400 will not be utilized to carry RF data. This may occur where the bandwidth capacity of a particular communication link exceeds the bandwidth demand of a particular remote unit. In those cases, the SeRF module assembling superframe 400 may alternately multiplex IP data onto otherwise unutilized timeslots of superframe 400 .
- FIG. 5 is a flow chart illustrating a method of one embodiment of the present invention.
- the method begins at 510 with receiving data from an internet protocol device, the data formatted for transport via an internet protocol network (IP data) at a remote unit of a distributed antenna system.
- IP data internet protocol network
- the method proceeds to 520 with converting analog RF signals received at the remote unit into digitized RF samples.
- the method proceeds to 530 with multiplexing the IP data with the digitized RF samples into frames for transmission to a host unit of the distributed antenna system.
- multiplexing the IP data with the digitized RF samples into frames is achieved by inserting digitized RF samples into timeslots and then multiplexing the IP data into remaining bits within each time slot.
- each RF data sample is 15 bits and each timeslot has a capacity of 16 bits
- the method utilizes 15 of 16 available bits within a timeslot to carry the RF data sample and mulitplexes IP data into the remaining 16 th bits of each timeslot.
- the method then proceeds to 540 with transmitting a superframe to the host unit, the superframe comprising timeslots carrying the IP data with the digitized RF samples.
- Computer readable media include devices such as any physical form of computer memory, including but not limited to punch cards, magnetic disk or tape, any optical data storage system, flash read only memory (ROM), non-volatile ROM, programmable ROM (PROM), erasable-programmable ROM (E-PROM), random access memory (RAM), or any other form of permanent, semi-permanent, or temporary memory storage system or device.
- Program instructions include, but are not limited to computer-executable instructions executed by computer system processors and hardware description languages such as Very High Speed Integrated Circuit (VHSIC) Hardware Description Language (VHDL).
- VHSIC Very High Speed Integrated Circuit
- VHDL Hardware Description Language
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US15/436,534 USRE47466E1 (en) | 2009-01-13 | 2017-02-17 | Systems and methods for IP communication over a distributed antenna system transport |
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US14425509P | 2009-01-13 | 2009-01-13 | |
US12/555,912 US8213401B2 (en) | 2009-01-13 | 2009-09-09 | Systems and methods for IP communication over a distributed antenna system transport |
US13/529,607 US8958410B2 (en) | 2009-01-13 | 2012-06-21 | Systems and methods for IP communication over a distributed antenna system transport |
US15/436,534 USRE47466E1 (en) | 2009-01-13 | 2017-02-17 | Systems and methods for IP communication over a distributed antenna system transport |
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US11563492B2 (en) * | 2013-12-23 | 2023-01-24 | Dali Wireless, Inc. | Virtual radio access network using software-defined network of remotes and digital multiplexing switches |
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