EP2606571A2 - Système d'antennes distribué reconfigurable à distance et ses procédés - Google Patents

Système d'antennes distribué reconfigurable à distance et ses procédés

Info

Publication number
EP2606571A2
EP2606571A2 EP11818695.6A EP11818695A EP2606571A2 EP 2606571 A2 EP2606571 A2 EP 2606571A2 EP 11818695 A EP11818695 A EP 11818695A EP 2606571 A2 EP2606571 A2 EP 2606571A2
Authority
EP
European Patent Office
Prior art keywords
network
radio
dau
rru
present
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP11818695.6A
Other languages
German (de)
English (en)
Other versions
EP2606571A4 (fr
Inventor
Paul Lemson
Shawn Patrick Stapleton
Sasa Trajko Trajkovic
Albert S. Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dali Systems Co Ltd
Original Assignee
Dali Systems Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US12/928,931 external-priority patent/US8804870B2/en
Priority claimed from US12/928,943 external-priority patent/US8542768B2/en
Priority claimed from US12/928,934 external-priority patent/US8351877B2/en
Application filed by Dali Systems Co Ltd filed Critical Dali Systems Co Ltd
Priority to EP22154290.5A priority Critical patent/EP4057769A1/fr
Publication of EP2606571A2 publication Critical patent/EP2606571A2/fr
Publication of EP2606571A4 publication Critical patent/EP2606571A4/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/16—Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
    • G06F15/177—Initialisation or configuration control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load

Definitions

  • the present invention generally relates to wireless communication systems employing Distributed Antenna Systems (DAS) as part of a distributed wireless network. More specifically, the present invention relates to a DAS utilizing software defined radio (SDR).
  • DAS Distributed Antenna Systems
  • SDR software defined radio
  • One approach is to deploy many low-power high-capacity base stations throughout the facility.
  • the quantity of base stations is determined based on the coverage of each base station and the total space to be covered.
  • Each of these base stations is provisioned with enough radio resources, i.e., capacity and broadband data throughput to accommodate the maximum subscriber loading which occurs during the course of the workday and work week.
  • radio resources i.e., capacity and broadband data throughput to accommodate the maximum subscriber loading which occurs during the course of the workday and work week.
  • this approach typically yields a high quality of service
  • the notable disadvantage of this approach is that during a major part of the time many of the base stations' capacity is being wasted. Since a typical indoor wireless network deployment involves capital and operational costs which are assessed on a per-subscriber basis for each base station, the typically high total life cycle cost for a given enterprise facility is far from optimal.
  • a second candidate approach involves deployment of a DAS along with a centralized group of base stations dedicated to the DAS.
  • a conventional DAS deployment falls into one of two categories.
  • the first type of DAS is "fixed", where the system configuration doesn't change based on time of day or other information about usage.
  • the remote units associated with the DAS are set up during the design process so that a particular block of base station radio resources is thought to be enough to serve each small group of DAS remote units.
  • a notable disadvantage of this approach is that most enterprises seem to undergo frequent re-arrangements and re-organizations of various groups within the enterprise. Therefore, it's highly likely that the initial setup will need to be changed from time to time, requiring deployment of additional staff and contract resources with appropriate levels of expertise regarding wireless networks.
  • the second type of DAS is equipped with a type of network switch which allows the location and quantity of DAS remote units associated with any particular centralized base station to be changed manually.
  • this approach would seem to allow dynamic reconfiguration based on the needs of the enterprise or based on time of day, it frequently requires deployment of additional staff resources for real-time management of the network.
  • Another issue is that it's not always correct or best to make the same DAS remote unit configuration changes back and forth on each day of the week at the same times of day.
  • the enterprise IT manager has no practical way to determine the loading at a given time of day for each DAS remote unit; they can only guess.
  • a major limitation of prior art DAS equipment employing digital transmission links such as optical fiber or wired Ethernet is the fact that the prior- art RF-to-digital conversion techniques utilize an approach whereby the system converts a single broad RF bandwidth of e.g., 10 to 25 MHz to digital. Therefore all the signals, whether weak or strong, desired or undesired, contained within that broad bandwidth are converted to digital, whether those signals are desired or not.
  • This approach frequently leads to inefficiencies within the DAS which limit the DAS network capacity. It would be preferable to employ an alternative approach yielding greater efficiencies and improved flexibility, particularly for neutral host applications.
  • Phase 2 accuracy for mobile wireless networks.
  • the information required in Phase 2 is the mobile phone number and the physical location, within a few dozen yards, from which the call was made.
  • the Canadian government is reportedly considering enacting similar requirements.
  • the FCC is eager to see US mobile network operators provide positioning services with enhanced accuracy for E-91 1 for indoor subscribers. There is a reported effort within the FCC to try to mandate Phase 2 accuracy indoors, within the next 2 years.
  • Many wireless networks employ mobile and fixed broadband wireless terminals which employ GPS-based E-91 1 location services. It has been demonstrated that GPS signals from satellites outdoors don't propagate well into the indoor space. Therefore an alternative, more robust E-91 1 location determination approach is required for indoors, particularly if the FCC
  • CDMA Pilot Beacon a separate unit known as a CDMA Pilot Beacon.
  • a notable disadvantage of this approach for an indoor DAS application is that since the CDMA Pilot Beacon unit is a separate and dedicated device and not integrated within the DAS, it would likely be costly to deploy.
  • the Pilot Beacon approach for CDMA networks employs a Pilot Beacon with a unique PN code (in that area) which effectively divides a particular CDMA network coverage area (e.g., indoors) into multiple small zones (which each correspond to the coverage area of a low-power Pilot Beacon). Each Pilot Beacon's location, PN code and RF Power level are known by the network.
  • Each Pilot Beacon must be synchronized to the CDMA network, via GPS or local base station connection.
  • a variable delay setting permits each Pilot Beacon to have the appropriate system timing to permit triangulation and/or Cell ID position determination.
  • One optional but potentially costly enhancement to this approach would employ a Wireless Modem for each Pilot Beacon to provide remote
  • LMU Location Measurement Unit
  • the present invention substantially overcomes the limitations of the prior art discussed above.
  • the advanced system architecture of the present invention provides a high degree of flexibility to manage, control, enhance and facilitate radio resource efficiency, usage and overall performance of the distributed wireless network.
  • This advanced system architecture enables specialized applications and enhancements including flexible simulcast, automatic traffic load-balancing, network and radio resource optimization, network calibration, autonomous/assisted commissioning, carrier pooling, automatic frequency selection, radio frequency carrier placement, traffic monitoring, traffic tagging, and indoor location determination using pilot beacons.
  • the present invention can also serve multiple operators, multi-mode radios (modulation-independent) and multi-frequency bands per operator to increase the efficiency and traffic capacity of the operators' wireless networks.
  • the amount of radio resources (such as RF carriers, CDMA codes or TDMA time slots) assigned to a particular RRU or group of RRUs by each RRU Access Module can be set via software control as described hereinafter to meet desired capacity and
  • an aspect of the present invention employs software-programmable frequency selective Digital Up-Converters (DUCs) and Digital Down-Converters (DDCs).
  • DUCs Digital Up-Converters
  • DDCs Digital Down-Converters
  • a software-defined Remote Radio Head architecture is used for cost- effective optimization of the radio performance. Frequency selective DDCs and DUCs at the Remote Radio Head enable a high signal to noise ratio (SNR) which maximize the throughput data rate.
  • SNR signal to noise ratio
  • An embodiment shown in Figure 1 depicts a basic structure and provides an example of a Flexible Simulcast downlink transport scenario.
  • Figure 2 depicts an embodiment of a basic structure of a Flexible Simulcast uplink transport scenario.
  • an embodiment converts only that plurality of specific, relatively narrow bandwidths that carry useful information.
  • this aspect of the present invention allows more efficient use of the available optical fiber transport bandwidth for neutral host applications, and facilitates transport of more operators' band segments over the optical fiber.
  • the present invention utilizes frequency-selective filtering at the Remote Radio Head which enhances the system performance.
  • noise reduction via frequency- selective filtering at the Remote Radio Head is utilized for maximizing the SNR and consequently maximizing the data throughput.
  • It is a further object of the present invention to provide CDMA and WCDMA indoor location accuracy enhancement.
  • an embodiment provides enhanced location accuracy performance by employing pilot beacons.
  • Figure 3 depicts a typical indoor system employing multiple Remote Radio Head Units (RRUs) and a central Digital Access Unit (DAU).
  • the Remote Radio Heads have a unique beacon that is distinct and identifies that particular indoor cell. The mobile user will use the beacon information to assist in the localization to a particular cell. .
  • an embodiment of the present invention provides localization of a user based on the radio signature of the mobile device.
  • Figure 4 depicts a typical indoor system employing multiple Remote Radio Head Units (RRUs) and a central Digital Access Unit (DAU).
  • RRUs Remote Radio Head Units
  • DAU Digital Access Unit
  • each Remote Radio Head provides unique header information on data received by that Remote Radio Head.
  • the system of the invention uses this header information in conjunction with the mobile user's radio signature to localize the user to a particular cell.
  • an embodiment determines the radio signatures of the individual users within a DAU or Island of DAUs and uses this infornnation to identify if the users are located within the coverage area associated with a specific DAU or Island of DAUs.
  • the DAUs track the radio signatures of all the active users within its network and record a running data base containing infornnation pertaining to them.
  • One embodiment of the present invention is for the Network Operations Center (NOC) to inform the DAU that, e.g., two specific users are collocated within the same DAU or Island of DAUs, as depicted in Figure 6.
  • NOC Network Operations Center
  • the DAUs then reroute the users to Internet VOIP, Wi-Fi or WiMAX as appropriate.
  • Another embodiment of the present invention is to determine the Internet Protocol (IP) addresses of the individual users' Wi-Fi connections. If the individual users' IP addresses are within the same DAU or Island of DAUs, the data call for these users is rerouted over the internal network.
  • IP Internet Protocol
  • Applications of the present invention are suitable to be employed with distributed base stations, distributed antenna systems, distributed repeaters, mobile equipment and wireless terminals, portable wireless devices, and other wireless communication systems such as microwave and satellite
  • the present invention is also field upgradable through a link such as an Ethernet connection to a remote computing center.
  • Appendix I is a glossary of terms used herein, including acronyms.
  • Figure 1 is a block diagram according to one embodiment of the invention showing the basic structure and an example of a Flexible Simulcast downlink transport scenario based on having 2 DAU and 4 DRU.
  • Figure 2 is a block diagram in accordance with an embodiment of the invention showing the basic structure and an example of a Flexible Simulcast uplink transport scenario based on having 2 DAU and 4 DRU.
  • FIG 3 shows an embodiment of an indoor system employing multiple Remote Radio Head Units (RRUs) and a central Digital Access Unit (DAU).
  • Figure 4 shows an embodiment of an indoor system in accordance with the invention which employs multiple Remote Radio Head Units (RRUs) and a central Digital Access Unit (DAU).
  • Figure 5 illustrates an embodiment of a cellular network system employing multiple Remote Radio Heads according to the present invention.
  • Figure 6 is a depiction of local connectivity according to one
  • FIG. 7 illustrates an embodiment of the basic structure of the embedded software control modules which manage key functions of the DAU and RRU, in accordance with the present invention.
  • the present invention is a novel Reconfigurable Distributed Antenna System that provides a high degree of flexibility to manage, control, re-configure, enhance and facilitate the radio resource efficiency, usage and overall performance of the distributed wireless network.
  • the Flexible Simulcast System 100 can be used to explain the operation of Flexible Simulcast with regard to downlink signals.
  • the system employs a Digital Access Unit functionality (hereinafter "DAU").
  • the DAU serves as an interface to the base station (BTS).
  • BTS base station
  • the DAU is (at one end) connected to the BTS, and on the other side connected to multiple RRUs.
  • DL downlink
  • RF signals received from the BTS are separately down-converted, digitized, and converted to baseband (using a Digital Down- Converter). Data streams are then l/Q mapped and framed.
  • Specific parallel data streams are then independently serialized and translated to optical signals using pluggable SFP modules, and delivered to different RRUs over optical fiber cable.
  • For the uplink (UL) path optical signals received from RRUs are de- serialized, deframed, and up-converted digitally using a Digital Up-Converter.
  • Data streams are then independently converted to the analog domain and up- converted to the appropriate RF frequency band.
  • the RF signal is then delivered to the BTS.
  • An embodiment of the system is mainly comprised of DAU1 indicated at 101 , RRU1 indicated at 103, RRU2 indicated at 104, DAU 2 indicated at 102, RRU3 indicated at 105, and RRU4 indicated at 106.
  • Composite signal 107 is comprised of Carriers 1 -4.
  • Composite signal 108 is comprised of
  • Carriers 5-8 The functionality of DAU 1 , DAU2, RRU1 , RRU2, RRU3 and RRU4 are explained in detail by U.S. Provisional Application S.N. 61 /374593, entitled "Neutral Host Architecture for a Distributed Antenna System," filed August 17, 2010 and attached hereto as an appendix.
  • One optical output of DAU1 is fed to RRU1 .
  • a second optical output of DAU1 is fed via bidirectional optical cable 1 13 to DAU2.
  • This connection facilitates networking of DAU1 and DAU2, which means that all of Carriers 1 -8 are available within DAU1 and DAU2 to transport to RRU1 , RRU2, RRU3 and RRU4 depending on software settings within the networked DAU system comprised of DAU1 and DAU2.
  • the software settings within RRU1 are configured either manually or automatically such that Carriers 1 -8 are present in the downlink output signal 109 at the antenna port of RRU1 .
  • the presence of all 8 carriers means that RRU1 is potentially able to access the full capacity of both base stations feeding DAU1 and DAU2.
  • a possible application for RRU1 is in a wireless distribution system is e.g., a cafeteria in an enterprise building during the lunch hour where a large number of wireless subscribers are gathered.
  • RRU2 is fed by a second optical port of RRU1 via bidirectional optical cable 1 14 to RRU2.
  • Optical cable 1 14 performs the function of daisy chaining RRU2 with RRU1 .
  • the software settings within RRU2 are configured either manually or automatically such that Carriers 1 , 3, 4 and 6 are present in downlink output signal 1 10 at the antenna port of RRU2.
  • the capacity of RRU2 is set to a much lower value than RRU1 by virtue of its specific Digital Up Converter settings.
  • the individual Remote Radio Units have integrated frequency selective DUCs and DDCs with gain control for each carrier.
  • the DAUs can remotely turn on and off the individual carriers via the gain control parameters.
  • the software settings within RRU3 are configured either manually or automatically such that Carriers 2 and 6 are present in downlink output signal 1 1 1 at the antenna port of RRU3.
  • the capacity of RRU3 which is configured via the software settings of RRU3 is much less than the capacity of RRU2.
  • RRU4 is fed by a second optical port of RRU3 via bidirectional optical cable 1 15 to RRU4.
  • Optical cable 1 15 performs the function of daisy chaining RRU4 with RRU3.
  • the software settings within RRU4 are configured either manually or automatically such that Carriers 1 , 4, 5 and 8 are present in downlink output signal 1 12 at the antenna port of RRU4.
  • RRU4 The capacity of RRU4 is set to a much lower value than RRU1 .
  • the present invention facilitates conversion and transport of several discrete relatively narrow RF bandwidths. This approach allows conversion of only those multiple specific relatively narrow bandwidths which carry useful or specific information. This approach also allows more efficient use of the available optical fiber transport bandwidth for neutral host applications, and allows transport of more individual operators' band segments over the optical fiber. As disclosed in U.S. Provisional Application S.N. 61 /374593, entitled
  • a related capability of the present invention is that not only can the
  • each RRU be configured to transport any specific narrow frequency band from the DAU input to any specific RRU output, but also the Digital Up Converters within each RRU can be configured to transport any specific time slot or time slots of each carrier from the DAU input to any specific RRU output.
  • the DAU detects which carriers and corresponding time slots are active. This information is relayed to the individual RRUs via the management control and monitoring protocol software discussed hereinafter.
  • This information is then used, as appropriate, by the RRUs for turning off and on individual carriers and their corresponding time slots.
  • an alternative embodiment of the present invention may be described as follows.
  • a previous embodiment involved having downlink signals from two separate base stations belonging to the same wireless operator enter DAU1 and DAU2 input ports respectively.
  • a second composite downlink input signal from e.g., a second base station belonging to a different wireless operator enters DAU2 at the DAU2 RF input port.
  • signals belonging to both the first operator and the second operator are converted and transported to RRU1 , RRU2, RRU3 and RRU4 respectively.
  • This embodiment provides an example of a neutral host wireless system, where multiple wireless operators share a common
  • the Digital Up Converters present in the RRU can be programmed to process various signal formats and modulation types including FDMA, CDMA, TDMA, OFDMA and others. Also, the Digital Up Converters present in the respective RRUs can be programmed to operate with signals to be transmitted within various frequency bands subject to the capabilities and limitations of the system architecture disclosed in U .S. Provisional Application S.N. 61/374593, entitled “Neutral Host Architecture for a Distributed Antenna System,” filed August 17, 2010.
  • the transmitted signal at the antenna ports of RRU 1 , RRU2 and RRU4 will be a wideband CDMA signal which is virtually identical to the signal present within the bandwidth corresponding to carrier 1 at the input port to DAU 1 .
  • the Digital Up Converters present in the respective RRUs can be programmed to transmit any desired composite signal format to each of the respective RRU antenna ports.
  • the Digital Up Converters present in RRU 1 and RRU2 can be dynamically software-reconfigured as described previously so that the signal present at the antenna port of RRU1 would correspond to the spectral profile shown in Figure 1 as 1 10, and also that the signal present at the antenna port of RRU2 would correspond to the spectral profile shown in Figure 1 as 109.
  • the Flexible Simulcast System 200 can be used to explain the operation of Flexible Simulcast with regard to uplink signals.
  • the uplink system shown in Figure 2 is mainly comprised of DAU1 indicated at 201 , RRU1 indicated at 203, RRU2 indicated at 204, DAU2 indicated at 202, RRU3 indicated at 205, and RRU4 indicated at 206.
  • the operation of the uplink system shown in Figure 2 can be understood as follows.
  • the Digital Down Converters present in each of RRU1 , RRU2, RRU3 and RRU4 are dynamically software-configured as described previously so that uplink signals of the appropriate desired signal format(s) present at the receive antenna ports of the respective RRU1 , RRU2, RRU3 and RRU4 are selected based on the desired uplink band(s) to be processed and filtered, converted and transported to the appropriate uplink output port of either DAU1 or DAU2.
  • the DAUs and RRUs frame the individual data packets corresponding to their respective radio signature using the Common Public Interface Standard (CPRI). Other Interface standards are applicable provided they uniquely identify data packets with respective RRUs. Header information is transmitted along with the data packet which indentifies the RRU and DAU that corresponds to the individual data packet.
  • CPRI Common Public Interface Standard
  • RRU3 are configured to receive uplink signals within the Carrier 2 bandwidth, whereas RRU2 and RRU4 are both configured to reject uplink signals within the Carrier 2 bandwidth.
  • RRU3 receives a strong enough signal at its receive antenna port within the Carrier 2 bandwidth to be properly filtered and
  • RRU3 facilitate processing and conversion.
  • RRU1 receives a strong enough signal at its receive antenna port within the Carrier 2 bandwidth to be properly filtered and
  • the Digital Down Converters within RRU1 facilitate processing and conversion.
  • the signals from RRU1 and RRU3 are combined based on the active signal combining algorithm, and are fed to the base station connected to the uplink output port of DAU1 .
  • the term simulcast is frequently used to describe the operation of RRU1 and RRU3 with regard to uplink and downlink signals within Carrier 2 bandwidth.
  • the term Flexible Simulcast refers to the fact that the present invention supports dynamic and/or manual rearrangement of which specific RRU are involved in the signal combining process for each Carrier bandwidth.
  • the Digital Down Converters present in RRU1 are configured to receive and process signals within Carrier 1 -8 bandwidths.
  • the Digital Down Converters present in RRU2 are configured to receive and process signals within Carrier 1 , 3, 4 and 6 bandwidths.
  • the Digital Down Converters present in RRU3 are configured to receive and process signals within Carrier 2 and 6 bandwidths.
  • the Digital Down Converters present in RRU4 are configured to receive and process signals within Carrier 1 , 4, 5 and 8 bandwidths.
  • the respective high-speed digital signals resulting from processing performed within each of the four RRU are routed to the two DAUs. As described previously, the uplink signals from the four RRUs are combined within the respective DAU corresponding to each base station.
  • An aspect of the present invention includes an integrated Pilot Beacon function within the each RRU.
  • each RRU comprises a unique software programmable Pilot Beacon as discussed hereinafter This approach is intended for use in CDMA and/or WCDMA indoor DAS networks. A very similar approach can be effective for indoor location accuracy enhancement for other types of networks such as LTE and WiMAX. Because each RRU is already controlled and monitored via the DAUs which comprise the network, there is no need for costly deployment of additional dedicated wireless modems for remote monitoring and control of pilot beacons.
  • Each operational pilot beacon function within an RRU employs a unique PN code (in that area) which effectively divides the WCDMA or CDMA indoor network coverage area into multiple small “zones" (which each correspond to the coverage area of a low-power Pilot Beacon).
  • Each Pilot Beacon's location, PN code and RF Power level are known by the network.
  • Each Pilot Beacon is synchronized to the WCDMA or CDMA network, via its connection to the DAU.
  • Pilot Beacon transmit signal will be effectively "static” and its downlink messages will not change over time based on network conditions.
  • each mobile subscriber terminal is able to perform Pilot Signal measurements of downlink signals transmitted by base stations and Pilot Beacons.
  • the WCDMA mobile subscriber terminal transitions to Active mode, it reports to the serving cell all its Pilot Signal measurements for base stations and for Pilot Beacons.
  • the operation is very similar.
  • the RRU can be provisioned as either a Pilot Beacon or to serve mobile subscribers in a particular operator bandwidth, but not both.
  • CPICH RSCP Peak Signal Code Power
  • measurements of CPICH Ec/No by the mobile subscriber terminal in either Idle mode or any of several active modes are possible.
  • the mobile subscriber terminal reports all available RSCP and Ec/No measurements via the serving base station (whether indoor or outdoor) to the network. Based on that information, the most likely mobile subscriber terminal location is calculated and/or determined.
  • CPICH RSCP Peak Signal Code Power
  • the operation is very similar to the process described herein.
  • a previously described embodiment of the present invention referring to Figure 1 involved having a wideband CDMA signal present within e.g., the bandwidth corresponding to carrier 1 at the input port to DAU1 .
  • the transmitted signal at the antenna ports of RRU1 , RRU2 and RRU4 is a wideband CDMA signal which is virtually identical to the signal present within the bandwidth corresponding to carrier 1 at the input port to DAU 1 .
  • An alternative embodiment of the present invention is one where a wideband CDMA signal is present within e.g., the bandwidth corresponding to carrier 1 at the input port to DAU1 .
  • the transmitted signal at the antenna port of RRU1 differs slightly from the previous embodiment.
  • a wideband CDMA signal is present within e.g., the bandwidth corresponding to carrier 1 at the input port to DAU1 .
  • the transmitted signal from RRU1 is a combination of the wideband CDMA signal which was present at the input port to DAU1 , along with a specialized WCDMA pilot beacon signal.
  • the WCDMA pilot beacon signal is intentionally set well below the level of the base station pilot signal.
  • the transmitted signal at the antenna port of RRU1 is a combination of the CDMA signal which was present at the input port to DAU1 , along with a specialized CDMA pilot beacon signal.
  • the CDMA pilot beacon signal is intentionally set well below the level of the base station pilot signal.
  • FIG. 4 depicts a typical indoor system employing multiple Remote Radio Head Units (RRUs) and a central Digital Access Unit (DAU).
  • RRUs Remote Radio Head Units
  • DAU Digital Access Unit
  • Each Remote Radio Head provides a unique header information on data received by that Remote Radio Head. This header information in conjunction with the mobile user's radio signature are used to localize the user to a particular cell.
  • the DAU signal processing can identify the individual carriers and their corresponding time slots.
  • a header is included with each data packet that uniquely identifies the corresponding RRU.
  • the DAU can detect the carrier frequency and the corresponding time slot associated with the individual RRUs.
  • the DAU has a running data base that identifies each carrier frequency and time slot with a respective RRU.
  • the carrier frequency and time slot is the radio signature that uniquely identifies the GSM user.
  • the DAU communicates with a Network Operation Center (NOC) via a
  • the Mobile Switching Center (MSC) in conjunction with the NOC can identify the corresponding BaseTransceiver Station (BTS) where the user has placed the call.
  • BTS BaseTransceiver Station
  • the user can be localized within a BTS cell.
  • the NOC then makes a request to the individual DAUs to determine if the E91 1 radio signature is active in their indoor cell.
  • the DAU checks its data base for the active carrier frequency and time slot. If that radio signature is active in the DAU, then that DAU will provide the NOC with the location information of the corresponding RRU.
  • a further embodiment of the present invention includes LTE to provide enhanced accuracy for determining the location of indoor wireless subscribers.
  • GSM uses individual carriers and time slots to distinguish users whereas LTE uses multiple carriers and time slot information to distinguish users.
  • the DAU can simultaneously detect multiple carriers and their corresponding time slots to uniquely identify the LTE user.
  • the DAU has a running data base that identifies the carrier frequencies and time slot radio signature for the respective RRU. This information can be retrieved from the NOC once a request is made to the DAU.
  • the DAU embedded software control module and RRU embedded software control module can be better understood in connection with the operation of key functions of the DAU and RRU.
  • the DAU embedded software control module comprises a DAU Monitoring module that detects which carriers and corresponding time slots are active for each RRU.
  • the DAU embedded software control module also comprises a DAU Management Control module which communicates with the RRU over a fiber optic link control channel via a control protocol with the RRU Management Control module.
  • the RRU Management Control module sets the individual parameters of all the RRU Digital Up-Converters to enable or disable specific radio resources from being transmitted by a particular RRU or group of RRUs, and also sets the individual parameters of all the RRU Digital
  • Down-Converters to enable or disable specific uplink radio resources from being processed by a particular RRU or group of RRUs.
  • an algorithm operating within the DAU Monitoring module that detects which carriers and corresponding time slots for each carrier are active for each RRU, provides information to the DAU Management Control module to help identify when, e.g., a particular downlink carrier is loaded by a percentage greater than a predetermined threshold whose value is
  • the DAU Management Control module adaptively modifies the system configuration to slowly begin to deploy additional radio resources (such as RF carriers, CDMA codes or TDMA time slots) for use by a particular RRU which need those radio resources within its coverage area.
  • the DAU Management Control module adaptively modifies the system configuration to slowly begin to remove certain radio resources (such as RF carriers, CDMA codes or TDMA time slots) for use by a particular RRU which no longer needs those radio resources within its coverage area.
  • Another such key function of the DAU embedded software control module and RRU embedded software control module is determining and/or setting and/or analyzing the appropriate
  • Pilot Beacon transmission and monitoring parameters for the integrated Pilot Beacon function contained within each RRU.
  • Pilot Beacon transmission and monitoring parameters include Beacon Enable/Disable, Beacon Carrier Frequencies, Beacon Transmit Power, Beacon PN Code, Beacon Downlink BCH Message Content, Beacon Alarm, Beacon Delay Setting and Beacon Delay Adjustment Resolution.
  • the RRU Pilot Beacon Control module communicates with the pilot beacon generator function in the RRU to set and monitor the pilot beacon parameters as listed herein.
  • the Reconfigurable Distributed Antenna System of the present invention described herein efficiently conserves resources and reduces costs.
  • the reconfigurable system is adaptive or manually field-programmable, since the algorithms can be adjusted like software in the digital processor at any time.

Abstract

La présente invention concerne une nouvelle utilité d'un système d'antennes distribué (DAS) basé sur une radio définie par logiciel (SDR) qui est reconfigurable à distance et prend en charge des schémas multimodulation (indépendants de la modulation), des porteuses multiples, des bandes multifréquences et des canaux multiples. La présente invention offre un degré élevé de souplesse pour gérer, commander, améliorer, faciliter l'utilisation et les performances d'un réseau sans fil distribué comme, par exemple, la diffusion simultanée, l'équilibrage automatique de charge du trafic, l'optimisation des ressources réseau et radio, l'étalonnage du réseau, la mise en service autonome/assistée, la mise en commun des porteuses, la sélection automatique des fréquences, le placement de la porteuse à fréquence, le contrôle du trafic, l'étiquetage du trafic, la balise pilote, etc. Par suite, le DAS SDR peut augmenter l'efficacité et la capacité de trafic du réseau sans fil des opérateurs.
EP11818695.6A 2010-08-17 2011-08-16 Système d'antennes distribué reconfigurable à distance et ses procédés Ceased EP2606571A4 (fr)

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US37459310P 2010-08-17 2010-08-17
US38283610P 2010-09-14 2010-09-14
US12/928,931 US8804870B2 (en) 2009-12-21 2010-12-21 Modulation agnostic digital hybrid mode power amplifier system and method
US12/928,933 US8730786B2 (en) 2009-12-21 2010-12-21 Remote radio head unit system with wideband power amplifier and method
US12/928,943 US8542768B2 (en) 2009-12-21 2010-12-21 High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications
US12/928,934 US8351877B2 (en) 2010-12-21 2010-12-21 Multi-band wideband power amplifier digital predistorition system and method
US201161439940P 2011-02-07 2011-02-07
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JP2017169223A (ja) 2017-09-21
EP4319477A3 (fr) 2024-04-17
JP2016067037A (ja) 2016-04-28
JP2013541255A (ja) 2013-11-07
KR20130136452A (ko) 2013-12-12
JP2013541875A (ja) 2013-11-14
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JP2016197899A (ja) 2016-11-24
JP6825017B2 (ja) 2021-02-03
KR101610447B1 (ko) 2016-04-08
JP2018186535A (ja) 2018-11-22
WO2012024345A2 (fr) 2012-02-23
JP6463707B2 (ja) 2019-02-06
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JP2017011747A (ja) 2017-01-12
JP6005646B2 (ja) 2016-10-12
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WO2012024345A3 (fr) 2013-05-23
EP4057769A1 (fr) 2022-09-14
EP2606571A4 (fr) 2018-01-03
JP6364109B2 (ja) 2018-07-25
JP2020188508A (ja) 2020-11-19
JP6405342B2 (ja) 2018-10-17
JP5859538B2 (ja) 2016-02-10
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EP4319477A2 (fr) 2024-02-07
JP6144327B2 (ja) 2017-06-07

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