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EP1072116A1 - Procede et systeme d'acces sans fil a internet - Google Patents

Procede et systeme d'acces sans fil a internet

Info

Publication number
EP1072116A1
EP1072116A1 EP99918601A EP99918601A EP1072116A1 EP 1072116 A1 EP1072116 A1 EP 1072116A1 EP 99918601 A EP99918601 A EP 99918601A EP 99918601 A EP99918601 A EP 99918601A EP 1072116 A1 EP1072116 A1 EP 1072116A1
Authority
EP
European Patent Office
Prior art keywords
data
traffic
communication device
subcarriers
channel
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.)
Withdrawn
Application number
EP99918601A
Other languages
German (de)
English (en)
Other versions
EP1072116A4 (fr
Inventor
Joseph C. Liberti
Melbourne Barton
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.)
Iconectiv LLC
Original Assignee
Telcordia Technologies Inc
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
Application filed by Telcordia Technologies Inc filed Critical Telcordia Technologies Inc
Publication of EP1072116A1 publication Critical patent/EP1072116A1/fr
Publication of EP1072116A4 publication Critical patent/EP1072116A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates generally to methods and systems for wireless Internet access, and more particularly, to a wireless Internet access system (WIAS)
  • WIAS wireless Internet access system
  • IEEE 802.1 1 compliant systems are used for indoor LAN and outdoor point-to-point
  • U-NII Ultra-Network Interface
  • 5 GHz band 5150-5250, 5250-5350, and 5725-5825 MHz
  • new systems which included complex signal processing and multiple antennas, enabled higher data rates over complex multipath channels encountered in
  • RadioLANTM supports data rates up to 100 Mbps as a wireless Ethernet replacement system.
  • a system and method consistent with the present invention supports the
  • a frame structure is used that can support the transmission of
  • Receiving units in the mobile subscriber units and networks include antenna arrays that provide for multipath transmission.
  • each modulated subcarrier having a different frequency and formed by modulating one of a plurality of serial symbols onto a
  • the method further comprises the steps of extracting the response of each antenna to each of the individual subcarriers, forming a vector for each
  • each element of a vector of a particular subcarrier representing the extracted response of one of the
  • Fig. 1 is a block diagram of a wireless Internet access system (WIAS) consistent with the present invention
  • Fig. 2 is a block and flow diagram illustrating intra-subnet mobility of a subscriber unit in the WIAS system of Fig. 1;
  • Fig. 3 is a flow diagram of a handoff process consistent with the present invention.
  • Fig. 4 is a block diagram of the WIAS system of Fig. 1 illustrating different connection scenarios for supporting voice traffic;
  • Fig. 5 is a block diagram of a simplified version of Fig. 4 illustrating the
  • Fig. 6 is a block diagram of a frame structure for transmitting multiple traffic types consistent with the present invention.
  • Figs. 7 A and 7B are block diagrams of a transmitter and receiver, respectively, consistent with the present invention.
  • Fig. 8 is a flow diagram of a transmission and reception process consistent with the present invention
  • Fig. 9 is a block diagram of a radio port in the WIAS system of Fig. 1 consistent with the present invention.
  • Fig. 10 is a block diagram of a subscriber unit in the WIAS system of Fig. 1 consistent with the present invention.
  • a WIAS system architecture consistent with the present invention includes major network functional elements, a radio interface, and important radio port and
  • the WIAS system provides an efficient means of supporting a wide variety of traffic types, ranging from broadband data pipes of up to
  • the WIAS system is designed with the
  • the WIAS system is resistant to multipath, and is tolerant of interference and spectrum reuse in unlicenced bands.
  • Fig. 1 is a block diagram of a wireless Internet access system (WIAS) 100
  • WIAS wireless Internet access system
  • WIAS 100 can be designed to use existing
  • networks such as a 100/lOBaseT Ethernet network, an Asynchronous Transfer Mode
  • WIAS 100 can be designed to use other networks as well, the following description will focus
  • WIAS 100 includes one or more islands 125, each island
  • Subnet 120 including one or more subnets 120.
  • Subnet 120 includes an existing network (not
  • RP radio ports
  • At least one of the RPs 110 in each subnet 120 includes
  • MA mobility agent
  • RPs 110 establish radio or wireless links with a plurality of
  • Each SU 105 can be homed to an existing subnet 120 by assigning it a permanent
  • IP home Internet Protocol
  • a mobility agent can be any mobility agent.
  • IP Internet Protocol
  • H.IP home Internet Protocol
  • a mobility agent can be any mobility agent.
  • MA 117 acts as a home agent (HA) for SUs 105 not
  • a real subnet i.e., a subnet with multiple subscriber units in addition to a
  • each island 125 includes elements for routing and
  • processing information to and from subnets 120 include a router 130,
  • NMM network management and monitoring system
  • Router 130 is a well known device for routing information to
  • NMM 135 provides
  • Gateway 140 represents an interface between the existing network and external communication
  • Telephone gateway 145 is a system and often includes firewall protection for the network.
  • Telephone gateway 145 is a system and often includes firewall protection for the network.
  • MIN mobile identification number
  • Internet Protocol Internet Protocol
  • IP IP addresses for SUs 105 that are capable of supporting telephony functions.
  • telephone gateway 145 can act as a voice IP modem for calls in progress.
  • Data from gateway 140 can be transmitted to an external communication system, such as the Internet 160, while data from telephone gateway 145 can be transmitted to an external communication system, such as the Internet 160, while data from telephone gateway 145 can be transmitted to an external communication system, such as the Internet 160, while data from telephone gateway 145 can be
  • PSTN public switched telephone network
  • a standard telephone 165 can be connected to PSTN 150, and an IP
  • phone 170 can be connected to the Internet 160.
  • WIAS 100 One of the functions of WIAS 100 is to support mobility for SUs 105.
  • 100 supports two levels of mobility, allowing mobility within a subnet as well as
  • Mobility functions include registration, location, and hand-off capabilities.
  • WIAS 100 7 offices using LANs that comprise a single subnet 120 can use WIAS 100 by simply
  • A-UPCS asynchronous unlicenced personal communication system
  • multiple RPs may share a carrier, which is taken into account by
  • the algorithm measures the received signal strength (RSS) from each RP.
  • the SU When the SU is not actively transmitting or receiving, the SU tunes to other frequency
  • SU stores in a table the RSS associated with the detected RP.
  • Each table entry may be valid for a short period of time (e.g., 2 seconds).
  • the SU is initially activated or when the signal strength from a current RP drops below a
  • the SU tunes to the frequency of the RP with the highest RSS in the
  • the SU when the strongest available RP signal is identified, the SU
  • RAS access slot
  • the RP provides its physical address in response to any address
  • ARP resolution protocol
  • the RP transmits a gratuitous ARP broadcast message throughout its
  • an SU registers with a radio port RP1 in step 1. If an SU
  • the SU repeats
  • step 2 if the SU locates a new RP (RP2), it transmits a local registration message on RP2.
  • RP2 new RP
  • gratuitous ARP to map the IP address of the SU with the physical address of RP2 for
  • an SU can roam seamlessly among subnets in an
  • subnet includes a mobility agent (MA).
  • MA mobility agent
  • RP acts as a home agent (HA) for that SU and acts as a foreign agent
  • SUs homed to a virtual subnet it may be preferable to use SUs homed to a virtual subnet. Using SUs homed to a virtual subnet is also preferable when many small subnets are present, when
  • An SU's home subnet is the subnet having a mask corresponding to the SU's
  • H.IP Permanent IP address
  • COA.IP Care-of-Address
  • an entire IP packet which may include the IP address of the
  • the packet may be encapsulated with the temporary address of the
  • CH host
  • the node sending packets to a roaming SU.
  • the first IP packet sent to a roaming SU from a CH is routed through the HA. If the CH
  • bindings are updated with the SU's HA as well as any CHs capable of route
  • the RP sends a mobility resolution request to the MA
  • the MA sends a message to the SU's home agent requesting
  • COA.IP Care-of-Address
  • the MA assigns the COA.IP address to the SU, which uses the
  • WIAS 100 Another function provided by WIAS 100 is to support full seamless handoff for
  • links in WIAS 100 can comprise numerous connection-oriented traffic
  • the handoff process for WIAS 100 involves a negotiation of radio resources
  • FIG. 3 shows a flow diagram of a handoff process consistent with the present
  • an SU successfully negotiates a registration with a new RP (step 305).
  • the registration message includes the IP address of the RP to which the SU was
  • the new RP (RP2) sends a
  • RPl responds with a message to RP2 containing the complete TCP/UDP
  • TLM Transactional Management Entity
  • step 315) RPl tears down all logical channels associated with the SU
  • step 320 while RP2 examines its available radio resources and attempts to establish
  • CBR constant bit rate
  • RP2 assigns new logical channels for each TCP port connection (step 330). If any *
  • a system can be implemented so that every RP always supports
  • each radio port has particular types of upstream and downstream traffic.
  • each radio port has particular types of upstream and downstream traffic.
  • each radio port has particular types of upstream and downstream traffic.
  • each radio port has
  • WIAS 100 may be sub-optimal for dedicated data streams, they
  • WIAS 100 can handle voice and other
  • WIAS 100 can handle voice-over-IP (VOIP) traffic.
  • VOIP voice-over-IP
  • the invention includes at least two broad categories for
  • the first category uses a separate voice
  • voice network 175 with direct connection to PSTN 150, such as a
  • Mobility may be supported by the
  • voice network the 100/lOBaseT data network, or both.
  • the other category for supporting voice traffic in WIAS 100 integrates voice
  • WIAS 100 including: (a) a connection from SU 105 to PSTN telephone 165 (PSTN-1)
  • TGW internal telephony gateway
  • connection on voice network 175 (b) a connection from SU 105 to IP telephone 170
  • IP-Phone through the Internet 160 without any PSTN connectivity
  • TGW 145 that interworks Internet 160 with PSTN 150.
  • TGW 145 includes.
  • WIAS 100 can use the IP-based Real Time Protocol
  • RTP Real-Time Protocol
  • UDP UDP connections.
  • RTP is a thin protocol that provides support for timing
  • RTP Transport Protocol
  • sessions can provide QoS feedback and convey information about participants in the
  • Both RTP and RTCP can be implemented at the
  • DTMF signaling is supported over the VOIP infrastructure using RTP.
  • H.323 supports the ITU-T defined H.245 connection control protocol
  • H.245 can provide an
  • WIAS 100 can be implemented as a dynamic time division duplex/time division
  • D-TDD/TDMA multiple access
  • Fig. 6 shows a frame structure for use in WIAS 100 consistent with the
  • phase lasting for a particular period of time, such as 30 seconds.
  • Each phase consists of a number of superframes.
  • a 30 second phase would include 120 superframes.
  • superframe is made up of, for example, 64 frames, which would correspond to
  • Each frame includes a
  • time slots such as sixteen, including both uplink and downlink slots.
  • number of uplink and downlink slots used in a frame can vary from one superframe to the next.
  • Each frame must include a downlink node control channel (NCC), which, by
  • the NCC defines the frame format for the phase
  • time slots are defined in reference to the immediately preceding NCC.
  • paging information which is used to inform SUs that there are incoming
  • connections directed to a particular SU as well as channel or slot assignments.
  • NCC also provides acknowledgments and word error indications (ACKSAVEI) for the
  • the NCC contains a frame descriptor
  • Each frame must also include an uplink random access slot (RAS), which, by
  • the RAS is subdivided into a number of frequency
  • subchannels each with 32 subcarriers.
  • the first block of subchannels is set aside for
  • ACK/NAK downlink acknowledgments
  • Access messages are used when an SU requests a UDC (uplink
  • UVSC uplink video stream channel
  • UMVC uplink multiplexed
  • Registration messages are used by an SU to announce
  • the RAS is also used by subscriber units to generate uplink time slot requests.
  • a series of time slots can carry a variety of
  • the frame preferably includes all
  • time slot is defined by its distance in time from the preceding NCC.
  • the DDC is the basic downlink data channel. Once ABR
  • Downlink Data established it is dedicated to traffic for a particular (available bit Channel subscriber for a specified number of frames. There are rate), VBR typically several DDC slots per frame. This channel supports (variable bit bulk download data including FTP and large Web downloads. rate)
  • the DPSC is a multiplexed downlink data stream containing ABR
  • Downlink Packet data for multiple uses, all of which monitor the streaming High Latency Stream Channel channel.
  • Each packet on the DPSC is identified for one of a Low Rate plurality of listeners.
  • the purpose of mis channel is to support short inbound messages.
  • the DVSC is essentially the same as the DDC, except that it CBR (constant
  • Downlink Video is assigned with higher priority, meaning that there will be bit rate), ABR, Stream Channel fewer delays incurred. This channel supports high rate data VBR streaming applications, such as video. Low Latency
  • the DMVC contains downlink data of multiplexed voice CBR
  • a number N voice calls share the DMVC by using Low Latency Multiplexed it once every N frames. For example, in a 10.3 MHz Voice Rate Voice Channel implementation, each slot supports 1 Mbps. Then 16 SUs multiplex voice signals onto the DMVC by using it once every 16 frames, providing 32 kbps at Vt rate coding. Unlike the other channels, a DMVC is always paired with an uplink UMVC.
  • the Uplink Data Channel is used to support high data rate ABR
  • Uplink Data uplink data traffic with medium to high delay tolerance are assigned to High Latency Channel UDC slots assigned to a particular subscriber and last High Rate over multiple frames.
  • UVSC provides a low latency, high data rate channel for CBR, ABR,
  • VBR Stream Channel such as video.
  • the UPAC channel provides CSMA (carrier sense multiple ABR
  • Uplink Packet access Uplink Packet access
  • High Latency Access Channel without the channel setup overhead involved in the UDC.
  • the UMVC is the uplink side of the DMVC.
  • the RP may choose to
  • the RP can support the UDC, UPAC, UVSC, and UMVC
  • each radio port is preferably implemented to support
  • time slots in the frame might be allocated to DDC and UDC channels.
  • the RP is free to change the make up of the frame, including multiplexed voice
  • the RP is free to change the fraction allocated to the downlink and
  • the RP can also change the DVSC UVSC
  • the RP is responsible for ensuring that all
  • Spectrum management in WIAS 100 is based on several overriding principles.
  • RPs generate a minimum amount of co-channel interference by transmitting only
  • RPs have only a tenuous grip on a frequency channel when its
  • RPs have dynamic frequency assignments which can
  • RP frequency selection functions are autonomous. Fourth, RPs support random access
  • RPs can "camp” on the frequency of another inactive RP, in essence
  • Two low-activity RPs can share a frequency channel by
  • the SU will awake from sleep cycles in
  • the SU will start to search for a new candidate RP (and possibly
  • each RP seizes a carrier frequency by scanning
  • the RP selects a channel of operation
  • RPs can be instructed to operate in the low, middle, or high U-NII
  • the U-NLI bands include the spectrum from
  • WIAS 100 can be implemented in other bands
  • WIAS 100 could be any type of WIAS 100 as well.
  • WIAS 100 could be any type of WIAS 100.
  • WIAS 100 could be used in a private spectrum, including the licenced
  • Channels 1-11 comprise the initial search set.
  • the total search set can include the
  • the initial search set includes
  • suitable channel in the initial search set it may search in other channels, resulting in a total set of 32 channels (2,4,8,...,62,64).
  • the initial search set includes seven
  • one of these bands it may search the entire set of 7 channels (10,18,26,34,42,50,58).
  • WIAS 100 In order to conserve battery life and minimize interference, WIAS 100
  • Power control is performed using both open loop and
  • the RP can direct an SU to increase or
  • the NCC recurs at least once per superframe, at
  • the NCC is free to transmit pages more
  • WIAS 100 depends on autonomous frequency selection by each RP
  • NMM has the ability to instruct any RP to either relinquish its channel, or acquire a
  • SUs may register with the RP without it becoming active.
  • the NCC transmitted by an idle RP contains a marker indicating that it is idle.
  • the active RP transmits a message
  • idle RPs transmit in a periodic fashion (one burst every superframe), each RP that starts
  • Two active RPs can also share a frequency band through another means.
  • the network can disable sleep modes and operate in an
  • aperiodic mode rather than transmitting the NCC once (or more) per
  • each RP must transmit its NCC no more than 250 msec from the beginning
  • each RP Before transmitting any frame, each RP monitors the channel for
  • the RP must wait at least 1 msec
  • RPs can either acquire frequency channels automatically, or specific
  • channels can be assigned as directed by the NMM.
  • WIAS 100 preferably transmits information between SUs and RPs using
  • Orthogonal Frequency Division Multiplexing which uses a large number of OFDM
  • 7A and 7B respectively show a block diagram of an OFDM transmitter 200 and an
  • OFDM receiver 250 consistent with the present invention. In the OFDM system, rather than
  • a very low symbol rate is used on a
  • the per-subcarrier symbol rate is low enough that time-
  • Fig. 8 shows a flow diagram of the operation of the OFDM transmitter/receiver
  • IFFT IFFT 23 transform
  • FFT transform
  • elements in the vector of a particular subcarrier represent the extracted responses of the
  • subcarriers is calculated by performing a mathematical operation, such as the dot
  • r(t) is the pulse shape applied to the transmitted waveform.
  • each burst contains a single OFDM symbol period.
  • the transmitter After transmitting a single symbol on each subcarrier, the transmitter does not
  • D/A digital-to-analog
  • each subcarrier uses differential encoding, such as frequency domain
  • FD-DQPSK differential quadrature phase shift keying
  • n 0...M-1, where M is the number of phase levels used in differential encoding.
  • Each pair of bits is then encoded as the difference between the phases of two
  • T s is the length of the time window used to sample the signal at the receiver.
  • the SUs and RPs may use multiple antennas to receive the transmitted
  • the SUs and RPs in WIAS 100 preferably use multiple receiving
  • antennas shown as antennas 252 of receiver 250 in Fig. 7B, the following vector model
  • time-varying, time-dispersive multipath channel can be used
  • Each element of the vector h(t, ⁇ ) represents the channel between the transmitter and
  • the model uses N L discrete paths from the
  • Each component is characterized by its direction-of-arrival (DOA), ⁇ , ⁇ , ⁇ , ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ , ⁇ DOA, ⁇ ,
  • the vector a( ⁇ ,) is the steering vector
  • the received signal at the array is may be represented as follows:
  • each element of u(t) represents the signal received by one of the antennas 252 among the array of antennas. It is assumed that the pulse shape varies very slowly with
  • Each element of vector v k represents the response of one of the antennas in the array to
  • r(t) can be any suitable subscriber amplifier and in order to minimize inter-subcarrier interference.
  • V k For small Doppler shifts such that p 1 «l/T s , the Vector V k can be represented as follows:
  • subcarriers can be calculated using detector 270.
  • a computationally simple technique
  • the carrier-to-carrier phase shift is estimated by multiplying spatial vectors for
  • Y k is a decision variable for the modulation scheme.
  • the detector of (10) can be any detector of (10)
  • the cyclic prefix may be implemented by prepending a transmitted data
  • AWGN additive white gaussian noise
  • MMSE Minimum Mean Square Error
  • the first step is to divide the data into pairs
  • Phase variations introduced by the channel may be significant over the entire bandwidth of the signal (N c ⁇ f), but are likely to be small
  • Differential encoding also provides an efficient
  • N c the number of subcarriers
  • subcarriers used in the above example range from 64 to 1024 subcarriers. For example, if the channel of operation is 5.15 GHz and the number of subcarriers is 64 with a separation of 5 KHz, the subcarriers would range from 5.15 GHz for the first subcarrier to 5.15 GHz + 315 KHz for the last subcarrier.
  • PAR peak-to-average power ratio
  • the peak instantaneous power of the burst can be as much as N c times the average power of the burst.
  • each burst sets aside N p subcarriers for crest factor
  • CFR Cost reduction
  • N c - N p data subcarriers are used with N p PAR subcarriers, using a set of N p modulating
  • the OFDM burst can be expressed as the sum of contributions from the data symbols and contributions from the CFR subcarriers as follows:
  • the data portion of the modulated signal, s d (t), is computed once for each set of data
  • Subcarriers/Burst 512 1024 2048 4096
  • portable subscriber terminals may only support 2.6 and 5.2 MHz bandwidths.
  • desktop systems can support up to 10.3 MHz, and links requiring
  • Fig. 9 shows a block diagram of RP 110 consistent with the present invention.
  • RP 110 comprises a POTS/ISDN Interface Module 900, an Ethernet Transceiver 905,
  • IP Interceptor 910 an IP Interceptor 910, a plurality of TCP/UDP Port to Logical Channel Mapping Modules (TUPLCM) 915, a Mobility Management Module 920, a Security
  • Management Module 925 Logical Channel Modules (LCM) 930, 935, and 940, a
  • Logical Channel Multiplexing Module 945 a Modulation/Encoding/Crest Factor Reduction Symbols Module (MECFR) 950, a Transmitter Antenna Selector 955,
  • MECFR Modulation/Encoding/Crest Factor Reduction Symbols Module
  • POTS/ISDN Interface Module 900 maps an input serial data stream to an output
  • output data stream 902 which is received by TUPLCM 915, may be bi-directional for either POTS or ISDN modes.
  • Ethernet Transceiver 905 maps data from an Ethernet cable to a serial data
  • IP Internet Protocol
  • IP Interceptor 910 then routes the IP packets in serial data stream 908
  • Each TUPLCM 915 which is associated with a subscriber, receives either the routed serial data stream 908 or data stream 902 and routes the traffic to individual LCMs 930, 935, and 940.
  • TUPLCM 915 associates each LCM 930, 935, and 940 with a different TCP or UDP port number.
  • TUPLCM 915 may be implemented as an object
  • TUPLCM 915 may be created and deleted as needed to match
  • Mobility Management Module 920 maps Care-Of IP addresses to actual IP
  • Each LCM 930, 935, and 940 includes a first bi-directional input port that connects to the TUPLCM 915. This first input port supports data for a particular
  • TCP/UDP port associated with a particular subscriber.
  • the data flowing into the first input port is buffered for transmission through an output port.
  • Serial data at the second input port is buffered for transmission to TUPLCM
  • Each LCM 930, 935, and 940 buffers delay-tolerant
  • each LCM 930, 935, and 940 re-transmits the buffered data through the output port.
  • delay-sensitive data such as voice, may not be buffered.
  • LCMs 930, 935, and 940 may be implemented as objects
  • each LCM 930, 935, and 940 can be created or deleted easily to support data streams for each subscriber.
  • Logical Channel Multiplexing Module 945 receives data streams from the
  • LCM 930, 935, and 940 outputs of LCM 930, 935, and 940, and multiplexes the data streams onto a single data stream 948, which is received by MECFR 950.
  • the amount of data taken from each data stream is matched to the number of bits contained in the data burst for each data type.
  • MECFR 950 groups sets of bits in the data stream 948 and generates as output a data stream 953. MECFR 950 adds to the data stream 948 Forward Error Control (FEC) encoding to control errors and Crest Factor Reduction (CFR) bits to minimize the peak-to-average ratio of the transmitted data symbols, thus reducing the required
  • FEC Forward Error Control
  • CFR Crest Factor Reduction
  • MECFR 950 groups
  • Transmitter Antenna Selector 955 maps the resulting data stream 953 onto one of RF XCVR 970, 975, and 980.
  • Each XCVR 970, 975, and 980 includes a digital input, a digital output, and an antenna port. Each XCVR 970, 975, and 980 converts digital data from the input into
  • Each OFDM Baseband Processing Module 960, 964, and 968 receives digitized symbols from the output of one XCVR 970, 975, and 980, extracts timing information, using a fast Fourier transform (FFT), extracts the symbols modulated onto each
  • Multi-Antenna Combining Module 985 receives the output data stream
  • each OFDM Baseband Processing Module 960, 964, and 968 generates a single combined data stream 988.
  • Detector/Receiver 990 converts the symbols in the data steam 988 into a binary digital data stream, and removes Crest Factor Reduction (CFR) bits and error control
  • Logical Channel De-Multiplexing Module 995 then receives and routes the binary digital data stream
  • Fig. 10 shows a block diagram of SU 105 consistent with the present invention.
  • SU 105 comprises a Serial/PCMCI A/Pilot Interface 1000, a plurality of TCP/UDP Port
  • TUPLCM Logical Channel Mapping Modules
  • Mobility Management Module 1010 a Mobility Management Module 1010
  • Security Management Module 1015 Logical Channel Modules 1020, 1025, and 1030
  • Logical Channel Multiplexing Module 1035 a Logical Channel Multiplexing Module
  • Transceivers (RF XCVR) 1050 and 1055 OFDM Baseband Processing Modules 1045 and 1060, a Multi- Antenna Combining Module 1065, a Detector/Receiver 1070, and a Logical Channel De-Multiplexing Module 1075.
  • Serial PCMCIA/Pilot Interface 1000 interfaces with a physical interface
  • TUPLCM 1005 receives and routes the IP packet data stream 1003 to one of LCMs 1020, 1025, and 1030.
  • TUPLCM 1005 associates each LCM 1020, 1025, and 1030 with a different TCP or UDP port number.
  • Mobility Management Module 1010 maps Care-Of IP addresses to actual IP addresses to support mobile IP.
  • Security Management Module 1015 performs
  • Each LCM 1020, 1025, and 1030 includes a first bi-directional port connects to
  • TUPLCM.1005. This interface supports data for a particular TCP/UDP port. The data stream flowing into the first port is buffered for transmission through a second port.
  • Serial data received from Logical Channel Multiplexing Module 1035 via a third port is buffered for transmission to TUPLCM 1005 via the first port.
  • Each LCM 1020, 1025, and 1030 buffers delay-tolerant transmitted data from the first port until the proper
  • ARQ automatic repeat request
  • each LCM 1020, 1025, and 1030 re-transmits
  • delay-sensitive data such as voice
  • Each LCM 1020, 1025, and 1030 may be implemented in software.
  • the amount of data taken from each data stream is matched to the number of bits contained in the data burst for each data type.
  • MECFR 1040 which receives the data stream 1038, groups sets of bits in the data stream 1038, and adds Forward Error Control (FEC) encoding to control errors and Crest Factor Reduction (CFR) bits to minimize the peak-to-average ratio of the transmitted data symbols, thus reducing the required dynamic range of SU 105 and
  • FEC Forward Error Control
  • CFR Crest Factor Reduction
  • Blocks of encoded bits are grouped together, and an inverse fast Fourier transform (IFFT) is performed on the data stream 1038 to form
  • IFFT inverse fast Fourier transform
  • MECFR 1040 then routes the resulting data stream to RF XCVR 1050.
  • OFDM Orthogonal Frequency Division Multiplexing
  • Each RF XCVR 1050 and 1055 includes a digital input, a digital output, and an antenna port. Each RF XCVR 1050 and 1055 converts digital data from the input into an analog signal, modulates onto an RF carrier, amplifies, filters, and transmits the
  • Each OFDM Baseband Processing Modules 1045 and 1060 receives digitized symbols from one of RF XCVR 1050 and 1055, extracts timing information, and using
  • FFT fast Fourier transform
  • Each OFDM Baseband Processing Modules 1045 and 1060 makes the
  • Multi- Antenna Combining Module 1065 generates a single combined
  • Detector/Receiver 1070 converts the symbols in data stream 1068 into a binary digital stream, and removes the CFR bits and error control encoding bits, resulting in a data stream 1073.
  • Logical Channel De-Multiplexing Module 1075 receives and routes
  • Peer-to-peer connections are easily supported in WIAS 100. As shown in Figs. 9 and 10, the functionality of the SU and RP are very similar. To initiate a peer-to-peer
  • one SU for example SU 105, simply generates an NCC burst on a
  • the NCC burst is specially identified as a peer-to-peer (PTP) NCC
  • a second subscriber for example SU 106, can link to SU 105 by registering with SU 105 exactly as if SU 105 were an RP. This registration allows direct data, voice, or video links between subscribers, even in the absence of the WIAS network.
  • WIAS 100 can be implemented as a fiber distributed data (FDD)
  • the WIAS downlink is fixed at 16 slots per frame
  • the WIAS uplink is fixed at 16 slots per frame (the RAS followed by 15 uplink user data slots).
  • WIAS 100 can use wireless links to connect subnets. There are many existing products that operate in the high U-NII band that can serve this purpose. Typically, such a wireless backbone would be deployed using directional antennas to provide a
  • WIAS 100 can be used in a Multi-Hop mode. This requires multiple RF transceiver cards in the RPs, such as
  • Fig. 9 one to provide subscriber access and one other for each multi-hop terminus.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

Selon cette invention, un système (100) et un procédé d'accès sans fil à Internet prennent en charge l'émission et la réception de plusieurs types de trafic entre les unités (105, 106) d'abonnés mobiles et les réseaux (120) existants. On utilise une structure cadre capable de prendre en charge différents types de trafic et de s'adapter aux changements relatifs aux types de trafic désiré ainsi qu'à la quantité de données nécessaire à chaque type de trafic déterminé. En outre, la transmission de données se fait au moyen du multiplexage par la répartition orthogonale en fréquence et de la modulation par déplacement de phase différentiel, et ce pour éviter l'interférence longitudinale. Les unités de réception faisant partie des unités (105, 106) d'abonnés mobiles et des réseaux (120) existants comprennent des réseaux d'antennes assurant l'émission multivoies.
EP99918601A 1998-04-17 1999-04-16 Procede et systeme d'acces sans fil a internet Withdrawn EP1072116A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US8207398P 1998-04-17 1998-04-17
US82073P 1998-04-17
PCT/US1999/008349 WO1999055030A1 (fr) 1998-04-17 1999-04-16 Procede et systeme d'acces sans fil a internet

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EP1072116A1 true EP1072116A1 (fr) 2001-01-31
EP1072116A4 EP1072116A4 (fr) 2005-08-03

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JP (1) JP3507436B2 (fr)
CA (1) CA2328865A1 (fr)
WO (1) WO1999055030A1 (fr)

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JP3507436B2 (ja) 2004-03-15
JP2002512478A (ja) 2002-04-23
CA2328865A1 (fr) 1999-10-28
EP1072116A4 (fr) 2005-08-03

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