WO2011000109A1 - Utilisation de premier et deuxieme preambules dans les signaux de communication sans fil - Google Patents

Utilisation de premier et deuxieme preambules dans les signaux de communication sans fil Download PDF

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Publication number
WO2011000109A1
WO2011000109A1 PCT/CA2010/001032 CA2010001032W WO2011000109A1 WO 2011000109 A1 WO2011000109 A1 WO 2011000109A1 CA 2010001032 W CA2010001032 W CA 2010001032W WO 2011000109 A1 WO2011000109 A1 WO 2011000109A1
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WO
WIPO (PCT)
Prior art keywords
synchronization
preamble
signal frame
synchronization preamble
sequence
Prior art date
Application number
PCT/CA2010/001032
Other languages
English (en)
Inventor
Robert Novak
Mo-Han Fong
Original Assignee
Nortel Networks Limited
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 Nortel Networks Limited filed Critical Nortel Networks Limited
Priority to KR1020127003155A priority Critical patent/KR101614982B1/ko
Priority to BR112012000075A priority patent/BR112012000075A8/pt
Priority to EP10793486.1A priority patent/EP2449832A4/fr
Priority to RU2012103043/08A priority patent/RU2541929C2/ru
Priority to CA2773945A priority patent/CA2773945C/fr
Priority to JP2012517991A priority patent/JP5830016B2/ja
Priority to CN201080039186.1A priority patent/CN102550096B/zh
Publication of WO2011000109A1 publication Critical patent/WO2011000109A1/fr
Priority to HK13100135.1A priority patent/HK1173025A1/xx

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
    • 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
    • H04L27/2602—Signal structure
    • H04L27/2603—Signal structure ensuring backward compatibility with legacy system
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26136—Pilot sequence conveying additional information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0025—Synchronization between nodes synchronizing potentially movable access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J2011/0096—Network synchronisation
    • 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
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation

Definitions

  • the present invention relates generally to the field of data delivery via a wireless connection and, more particularly, to the delivery of data via signal frames that comprise multiple synchronization preambles.
  • the high-speed data signals are divided into tens or hundreds of lower speed signals that are transmitted in parallel over respective frequencies within a radio frequency (RF) signal that are known as sub-carrier frequencies ("sub-carriers").
  • RF radio frequency
  • the frequency spectra of the sub-carriers overlap so that the spacing between them is minimized.
  • the sub-carriers are also orthogonal to each other so that they are statistically independent and do not create crosstalk or otherwise interfere with each other. As a result, the channel bandwidth is used much more efficiently than in conventional single carrier transmission schemes such as AM/FM (amplitude or frequency modulation).
  • Another approach to providing more efficient use of the channel bandwidth is to transmit the data using a base station having multiple antennas and then receive the transmitted data using a remote station having multiple receiving antennas, referred to as Multiple Input-Multiple Output (MEV1O).
  • the data may be transmitted such that there is spatial diversity between the signals transmitted by the respective antennas, thereby increasing the data capacity by increasing the number of antennas.
  • the data is transmitted such that there is temporal diversity between the signals transmitted by the respective antennas, thereby reducing signal fading.
  • a preamble may be inserted within a signal frame in order to provide: base station identification and selection, CIR measurement, framing and timing synchronization, frequency synchronization as well as channel estimation.
  • the preamble search requires a large amount of computation power at the subscriber station.
  • the subscriber station needs to perform the correlations with all possible pseudo noise (PN) sequences for each Fourier fast transform window position within the entire searching window.
  • PN pseudo noise
  • Such a window could be large even for the synchronous bases station network.
  • the preamble search is of excessively high computational complexity.
  • the present invention provides a method of transmitting data within a signal frame.
  • the method comprises inserting a first synchronization preamble into a first location within the signal frame and inserting a second synchronization preamble into a second location within the signal frame, wherein the first synchronization preamble conveys information indicative of the second location.
  • the method further comprises issuing the signal frame towards a receiving device in a wireless communication environment.
  • the present invention provides a method for generating a signal frame.
  • the method comprises determining a first location within the signal frame for inserting a first synchronization preamble and a second location within the signal frame for inserting a second synchronization preamble, generating the first synchronization preamble at least in part on a basis of the determined second location of the second synchronization preamble, inserting the first synchronization preamble at the determined first location within the signal frame, inserting the second synchronization preamble at the determined second location within the signal frame and causing the signal frame to be issued towards a receiving device in a wireless communication environment.
  • the present invention provides a transmitting device for transmitting a signal frame over a wireless communication environment.
  • the transmitting device comprises a control entity operative for determining a first location within the signal frame for a first synchronization preamble and a second location within the signal frame for a second synchronization preamble, generating the first synchronization preamble at least in part on a basis of the determined second location of the second synchronization preamble, inserting the first synchronization preamble at the determined first location within the signal frame and inserting the second synchronization preamble at the determined second location within the signal frame.
  • the transmitting device further comprises transmitting circuitry for causing the signal frame to be issued towards a receiving device.
  • the present invention provides a method of receiving a signal frame in a wireless communication environment.
  • the method comprises receiving a wireless signal comprising a plurality of signal frames, wherein each signal frame comprises a first synchronization preamble and a second synchronization preamble, identifying a first synchronization preamble within a given signal frame, determining at least in part on a basis of information conveyed by the first synchronization preamble a location within the given signal frame of the second synchronization preamble and obtaining from a combination of the first synchronization preamble and the second synchronization preamble transmission signalling information.
  • the present invention provides a receiving device for receiving a signal frame in a wireless communication environment.
  • the receiving device comprises receiving circuitry and a control entity.
  • the receiving circuitry is for receiving a wireless signal comprising a plurality of signal frames, wherein each signal frame comprises a first synchronization preamble and a second synchronization preamble.
  • the control entity is for identifying a first synchronization preamble within a given signal frame of the wireless signal, determining at least in part on a basis of information conveyed by the first synchronization preamble a location within the given signal frame of the second synchronization preamble and obtaining from a combination of the first synchronization preamble and the second synchronization preamble transmission signalling information.
  • Figure 1 shows a block representation of a wireless communication system
  • Figure 2 shows a block representation of a base station according to a non-limiting embodiment of trie present invention
  • Figure 3 shows a block representation of a mobile station according to a non-limiting embodiment of the present invention
  • Figure 4 shows a block representation of a relay station according to a non-limiting embodiment of the present invention
  • Figure 5 shows a logical breakdown of a transmitter architecture according to a non- limiting embodiment of the present invention
  • Figure 6 shows a logical breakdown of a receiver architecture according to a non- limiting embodiment of the present invention
  • Figure 7 shows Figure 1 of IEEE 802.16m-08/003rl, an example of an overall network architecture
  • Figure 8 shows Figure 2 of IEEE 802.16m-08/003rl, a relay station in an overall network architecture
  • Figure 9 shows Figure 3 of IEEE 802.16m-08/003rl, a system reference model
  • Figure 10 shows Figure 4 of IEEE 802.16m-08/003rl, the IEEE 802.16m protocol structure
  • Figure 11 shows Figure 5 of IEEE 802.16m-08/003rl, the IEEE 802.16m MS/BS data plane processing flow
  • Figure 12 shows Figure 6 of IEEE 802.16m-08/003rl, the IEEE 802.16m MS/BS control plane processing flow
  • Figure 13 shows Figure 7 of IEEE 802.16m-08/003rl, generic protocol architecture to support multica ⁇ ier system
  • Figure 14 shows an example of a signal comprising frames, subframes and first and second synchronization sequences
  • Figures 15(a)-(c) show non- limiting representations of a synchronization channel in relation to primary and secondary carrier frequencies
  • Figures 16(a)-(c) show non-limiting representations of primary and secondary synchronization channels in relation to primary and secondary carrier frequencies
  • Figure 17 shows a non-limiting example of a method used by a transmitting device in order to transmit signals in a wireless communication environment
  • Figure 18 shows a non-limiting example of a method used by a receiving device in order to receive signals over a wireless communication environment.
  • FIG. 1 shows a base station controller (BSC) 10 which controls wireless communications within multiple cells 12, which cells are served by corresponding base stations (BS) 14.
  • BSC base station controller
  • each cell is further divided into multiple sectors 13 or zones (not shown).
  • each base station 14 facilitates communications using OFDM with mobile and/or wireless terminals 16, which are within the cell 12 associated with the corresponding base station 14.
  • the movement of the mobile terminals (MS) 16 in relation to the base stations 14 results in significant fluctuation in channel conditions.
  • the base stations 14 and mobile terminals 16 may include multiple antennas to provide spatial diversity for communications.
  • relay stations 15 may assist in communications between base stations 14 and wireless terminals 16.
  • Wireless mobile terminals 16 can be handed off 18 from any cell 12, sector 13, zone (not shown), base station 14 or relay station (RS) 15 to another cell 12, sector 13, zone (not shown), base station 14 or relay station 15.
  • base stations 14 communicate with each other and with another network (such as a core network or the internet, both not shown) over a backhaul network 11.
  • a base station controller 10 is not needed.
  • the base station 14 generally includes a control entity 20, a baseband processor 22, transmit circuitry 24, receive circuitry 26, multiple antennas 28, and a network interface 30.
  • the receive circuitry 26 receives radio frequency signals bearing information from one or more remote transmitters provided by mobile terminals 16 (illustrated in FIG. 3) and relay stations 15 (illustrated in FIG. 4).
  • a low noise amplifier and a filter may cooperate to amplify and remove broadband interference from the signal for processing.
  • Downconversion and digitization circuitry (not shown) will then downconvert the filtered, received signal to an intermediate or baseband frequency signal, which is then digitized into one or more digital streams.
  • the baseband processor 22 processes the digitized received signal to extract the information or data bits conveyed in the received signal. This processing typically comprises demodulation, decoding, and error correction operations. As such, the baseband processor 22 is generally implemented in one or more digital signal processors (DSPs) or application-specific integrated circuits (ASICs).
  • DSPs digital signal processors
  • ASICs application-specific integrated circuits
  • the baseband processor 22 receives digitized data, which may represent voice, data, or control information, from the network interface 30 under the control of control entity 20, and encodes the data for transmission,
  • the encoded data is output to the transmit circuitry 24, where it is modulated by one or more carrier signals having a desired transmit frequency or frequencies.
  • a power amplifier (not shown) will amplify the modulated carrier signals to a level appropriate for transmission, and deliver the modulated carrier signals to the antennas 28 through a matching network (not shown). Modulation and processing details are described in greater detail below.
  • the mobile terminal 16 will include a control entity 32, a baseband processor 34, transmit circuitry 36, receive circuitry 38, multiple antennas 40, and-user interface circuitry 42.
  • the receive circuitry 38 receives radio frequency signals bearing information from one or more wireless transmitters, which could be base stations 14 and/or relays 15.
  • a low noise amplifier and a filter may cooperate to amplify and remove broadband interference from the signal for processing.
  • Downconversion and digitization circuitry (not shown) will then downconvert the filtered, received signal to an intermediate or baseband frequency signal, which is then digitized into one or more digital streams.
  • the baseband processor 34 processes the digitized received signal to extract the information or data bits conveyed in the received signal. This processing typically comprises demodulation, decoding, and error correction operations.
  • the baseband processor 34 is generally implemented in one or more digital signal processors (DSPs) and application specific integrated circuits (ASICs).
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • the baseband processor 34 receives digitized data, which may represent voice, video, data, or control information, from the control entity 32, which it encodes for transmission.
  • the encoded data is output to the transmit circuitry 36, where it is used by a modulator to modulate one or more carrier signals that is at a desired transmit frequency or frequencies.
  • a power amplifier (not shown) will amplify the modulated carrier signals to a level appropriate for transmission, and deliver the modulated carrier signal to the antennas 40 through a matching network (not shown).
  • Various modulation and processing techniques available to those skilled in the art are used for signal transmission between the mobile terminal and the base station, either directly or via the relay station 15.
  • the transmission band is divided into multiple, orthogonal carrier waves. Each carrier wave is modulated according to the digital data to be transmitted. Because OFDM divides the transmission band into multiple carriers, the bandwidth per carrier decreases and the modulation time per carrier increases. Since the multiple carriers are transmitted in parallel, the transmission rate for the digital data, or symbols, on any given carrier is lower than when a single carrier is used.
  • OFDM modulation utilizes the performance of an Inverse Fast Fourier Transform (IFFT) on the information to be transmitted.
  • FFT Fast Fourier Transform
  • the IFFT and FFT are provided by digital signal processing carrying out an Inverse Discrete Fourier Transform (IDFT) and Discrete Fourier Transform (DFT), respectively.
  • IDFT Inverse Discrete Fourier Transform
  • DFT Discrete Fourier Transform
  • the characterizing feature of OFDM modulation is that orthogonal carrier waves are generated for multiple bands within a transmission channel.
  • the modulated signals are digital signals having a relatively low transmission rate and capable of staying within their respective bands.
  • the individual carrier waves are not modulated directly by the digital signals. Instead, all carrier waves are modulated at once by IFFT processing.
  • OFDM is preferably used for at least downlink transmission from the base stations 14 to the mobile terminals 16.
  • the respective antennas can be used for reception and transmission using appropriate duplexers or switches and are so labelled only for clarity.
  • OFDM is preferably used for downlink transmission from the base stations 14 to the relays 15 and from relay stations 15 to the mobile terminals 16.
  • the relay station 15 will include a control entity 132, a baseband processor 134, transmit circuitry 136, receive circuitry 138, multiple antennas 130, and relay circuitry 142.
  • the relay circuitry 142 enables the relay 15 to assist in communications between a base station 16 and mobile terminals 16.
  • the receive circuitry 138 receives radio frequency signals bearing information from one or more base stations 14 and mobile terminals 16.
  • a low noise amplifier and a filter may cooperate to amplify and remove broadband interference from the signal for processing.
  • Downconversion and digitization circuitry (not shown) will then downconvert the filtered, received signal to an intermediate or baseband frequency signal, which is then digitized into one or more digital streams.
  • the baseband processor 134 processes the digitized received signal to extract the information or data bits conveyed in the received signal. This processing typically comprises demodulation, decoding, and error correction operations.
  • the baseband processor 134 is generally implemented in one or more digital signal processors (DSPs) and application specific integrated circuits (ASICs).
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • the baseband processor 134 receives digitized data, which may represent voice, video, data, or control information, from the control entity 132, which it encodes for transmission.
  • the encoded data is output to the transmit circuitry 136, where it is used by a modulator to modulate one or more carrier signals that is at a desired transmit frequency or frequencies.
  • a power amplifier (not shown) will amplify the modulated carrier signals to a level appropriate for transmission, and deliver the modulated carrier signal to the antennas 130 through a matching network (not shown).
  • Various modulation and processing techniques available to those skilled in the art are used for signal transmission between the mobile terminal and the base station, either directly or indirectly via a relay station 15, as described above.
  • the base station controller 10 will send data to be transmitted to various mobile terminals 16 to the transmitting devices, which could be the base station 14 directly or the base station 14 with the assistance of a relay station 15.
  • the base station 14 may use the channel quality indicators (CQIs) associated with the mobile terminals to schedule the data for transmission as well as select appropriate coding and modulation for transmitting the scheduled data.
  • the CQIs may be directly from the mobile terminals 16 or determined at the base station 14 based on information provided by the mobile terminals 16. In either case, the CQI for each mobile terminal 16 is a function of the degree to which the channel amplitude (or response) varies across the OFDM frequency band.
  • Scheduled data 44 which is a stream of bits, is scrambled in a manner reducing the peak-to-average power ratio associated with the data using data scrambling logic 46.
  • a cyclic redundancy check (CRC) for the scrambled data is determined and appended to the scrambled data using CRC adding logic 48.
  • channel coding is performed using channel encoder logic 50 to effectively add redundancy to the data to facilitate recovery and error correction at the mobile terminal 16. Again, the channel coding for a particular mobile terminal 16 is based on the CQI.
  • the channel encoder logic 50 uses known Turbo encoding techniques.
  • the encoded data is then processed by rate matching logic 52 to compensate for the data expansion associated with encoding.
  • Bit interleaver logic 54 systematically reorders the bits in the encoded data to minimize the loss of consecutive data bits.
  • the resultant data bits are systematically mapped into corresponding symbols depending on the chosen baseband modulation by mapping logic 56.
  • mapping logic 56 Preferably, Quadrature Amplitude Modulation (QAM) or Quadrature Phase Shift Key (QPSK) modulation is used.
  • QAM Quadrature Amplitude Modulation
  • QPSK Quadrature Phase Shift Key
  • the degree of modulation is preferably chosen based on the CQI for the particular mobile terminal.
  • the S)TBbOIs may be systematically reordered to further bolster the immunity of the transmitted signal to periodic data loss caused by frequency selective fading using symbol interleaver logic 58.
  • STC encoder logic 60 which modifies the symbols in a fashion making the transmitted signals more resistant to interference and more readily decoded at a mobile terminal 16.
  • the STC encoder logic 60 will process the incoming symbols and provide "n" outputs corresponding to the number of transmit antennas 28 for the base station 14.
  • the control system 20 and/or baseband processor 22 as described above with respect to FIG. 5 will provide a mapping control signal to control STC encoding.
  • the symbols for the "n" outputs are representative of the data to be transmitted and capable of being recovered by the mobile terminal 16.
  • each of the symbol streams output by the STC encoder logic 60 is sent to a corresponding IFFT processor 62, illustrated separately for ease of understanding.
  • the IFFT processors 62 will preferably operate on the respective symbols to provide an inverse Fourier Transform.
  • the output of the IFFT processors 62 provides symbols in the time domain.
  • the time domain symbols are grouped into frames, which are associated with a prefix by prefix insertion logic 64.
  • Each of the resultant signals is up-converted in the digital domain to an intermediate frequency and converted to an analog signal via the corresponding digital up-conversion (DUC) and digital-to-analog (D/A) conversion circuitry 66.
  • the resultant (analog) signals are then simultaneously modulated at the desired RF frequency, amplified, and transmitted via the RF circuitry 68 and antennas 28.
  • pilot signals known by the intended mobile terminal 16 are scattered among the sub-carriers. The mobile terminal 16, which is discussed in detail below, will use the pilot signals for channel estimation.
  • FIG. 6 illustrates reception of the transmitted signals by a mobile terminal 16, either directly from base station 14 or with the assistance of relay 15.
  • the respective signals are demodulated and amplified by corresponding RF circuitry 70.
  • Analog-to-digital (A/D) converter and down-conversion circuitry 72 digitizes and downconverts the analog signal for digital processing.
  • the resultant digitized signal may be used by automatic gain control circuitry (AGC) 74 to control the gain of the amplifiers in the RF circuitry 70 based on the received signal level.
  • AGC automatic gain control circuitry
  • the digitized signal is provided to synchronization logic 76, which includes coarse synchronization logic 78, which buffers several OFDM symbols and calculates an auto-correlation between the two successive OFDM symbols.
  • a resultant time index corresponding to the maximum of the correlation result determines a fine synchronization search window, which is used by fine synchronization logic 80 to determine a precise framing starting position based on the headers.
  • the output of the fine synchronization logic 80 facilitates frame acquisition by frame alignment logic 84. Proper framing alignment is important so that subsequent FFT processing provides an accurate conversion from the time domain to the frequency domain.
  • the fine synchronization algorithm is based on the correlation between the received pilot signals carried by the headers and a local copy of the known pilot data.
  • the synchronization logic 76 includes frequency offset and clock estimation logic 82, which is based on the headers to help estimate such effects on the transmitted signal and provide those estimations to the correction logic 88 to properly process OFDM symbols.
  • the OFDM symbols in the time domain are ready for conversion to the frequency domain using FFT processing logic 90.
  • the results are frequency domain symbols, which are sent to processing logic 92.
  • the processing logic 92 extracts the scattered pilot signal using scattered pilot extraction logic 94, determines a channel estimate based on the extracted pilot signal using channel estimation logic 96, and provides channel responses for all sub-carriers using channel reconstruction logic 98.
  • the pilot signal is essentially multiple pilot symbols that are scattered among the data symbols throughout the OFDM sub-carriers in a known pattern in both time and frequency.
  • the processing logic compares the received pilot symbols with the pilot symbols that are expected in certain sub-carriers at certain times to determine a channel response for the sub-carriers in which pilot symbols were transmitted.
  • the results are interpolated to estimate a channel response for most, if not all, of the remaining sub-carriers for which pilot symbols were not provided.
  • the actual and interpolated channel responses are used to estimate an overall channel response, which includes the channel responses for most, if not all, of the sub-carriers in the OFDM channel.
  • the frequency domain symbols and channel reconstruction information which are derived from the channel responses for each receive path are provided to an STC decoder 100, which provides STC decoding on both received paths to recover the transmitted symbols.
  • the channel reconstruction information provides equalization information to the STC decoder 100 sufficient to remove the effects of the transmission channel when processing the respective frequency domain symbols.
  • the recovered symbols are placed back in order using symbol de-interleaver logic 102, which corresponds to the symbol interleaver logic 58 of the transmitter.
  • the de- interleaved symbols are then demodulated or de-mapped to a corresponding bitstream using de-mapping logic 104.
  • bit de-interleaver logic 106 which corresponds to the bit interleaver logic 54 of the transmitter architecture.
  • the de- interleaved bits are then processed by rate de-matching logic 108 and presented to channel decoder logic 110 to recover the initially scrambled data and the CRC checksum.
  • CRC logic 112 removes the CRC checksum, checks the scrambled data in traditional fashion, and provides it to the de-scrambling logic 114 for de-scrambling using the known base station de-scrambling code to recover the originally transmitted data 116.
  • a CQI or at least information sufficient to create a CQI at the base station 14, is determined and transmitted to the base station 14.
  • the CQI may be a function of the carrier-to-interference ratio (CR), as well as the degree to which the channel " response varies across the various sub-carriers in the OFDM frequency band.
  • the channel gain for each sub-carrier in the OFDM frequency band being used to transmit information is compared relative to one another to determine the degree to which the channel gain varies across the OFDM frequency band.
  • numerous techniques are available to measure the degree of variation, one technique is to calculate the standard deviation of the channel gain for each sub-carrier throughout the OFDM frequency band being used to transmit data.
  • a relay station may operate in a time division manner using only one radio, or alternatively include multiple radios.
  • FIGs. 1 to 6 provide one specific example of a communication system that could be used to implement embodiments of the application. It is to be understood that embodiments of the application can be implemented with communications systems having architectures that are different than the specific example, but that operate in a manner consistent with the implementation of the embodiments as described herein.
  • Fig. 7 there is shown an example network reference model, which is a logical representation of a network that supports wireless communications among the aforementioned BSs 14, MSs 16 and RSs 15, in accordance with a non-limiting embodiment of the present invention.
  • the network reference model identifies functional entities and reference points over which interoperability is achieved between these functional entities.
  • the network reference model can include a MS 16, an Access Service Network (ASN), and a Connectivity Service Network (CSN).
  • ASN Access Service Network
  • CSN Connectivity Service Network
  • the ASN can be defined as a complete set of network functions needed to provide radio access to a subscriber (e.g., an IEEE 802.16e/m subscriber).
  • the ASN can comprise network elements such as one or more BSs 14, and one or more ASN gateways.
  • An ASN may be shared by more than one CSN.
  • the ASN can provide the following functions:
  • H-NSP Home Network Service Provider
  • Relay functionality for establishing Layer-3 (L3) connectivity with the MS 16 e.g., IP address allocation
  • an ASN can further support the following functions:
  • the CSN can be defined as a set of network functions that provide IP connectivity services to the subscriber.
  • a CSN may provide the following functions:
  • the CSN can provide services such as location based services, connectivity for p ⁇ er- to-peer services, provisioning, authorization and/or connectivity to IP multimedia services.
  • the CSN may further comprise network elements such as routers, AAA proxy/servers, xiser databases, and interworking gateway MSs.
  • the CSN may be deployed as part of a IEEE 802.16m NSP or as part of an incumbent IEEE 802.16e NSP.
  • RSs 15 may be deployed to provide improved coverage and/or capacity.
  • a BS 14 that is capable of supporting a legacy RS communicates with the legacy RS in the "legacy zone".
  • the BS 14 is not required to provide legacy protocol support in the "16m zone”.
  • the relay protocol design could be based on the design of IEEE 802-16j, although it may be different from IEEE 802-16j protocols used in the "legacy zone”.
  • MAC Medium Access Control
  • PHY Physical
  • the convergence sublayer performs mapping of external network data received through the CS SAP into MAC SDUs received by the MAC CPS through the MAC SAP, classification of external network SDUs and associating them to MAC SFDD and CID, Payload header suppression/compression (PHS).
  • PHS Payload header suppression/compression
  • the security sublayer performs authentication and secure key exchange and Encryption.
  • the physical layer performs Physical layer protocol and functions.
  • MAC Medium Access Control
  • connection-oriented That is to say, for the purposes of mapping to services on the MS 16 and associating varying levels of QoS, data communications are carried out in the context of "connections".
  • service flows may be provisioned when the MS 16 is installed in the system. Shortly after registration of the MS 16, connections are associated with these service flows (one connection per service flow) to provide a reference against which to request bandwidth. Additionally, new connections maybe established when a customer's service needs change.
  • a connection defines both the mapping between peer convergence processes that utilize the MAC and a service flow.
  • the service flow defines the QoS parameters for the MAC protocol data units (PDUs) that are exchanged on the connection.
  • PDUs MAC protocol data units
  • service flows are integral to the bandwidth allocation process.
  • the MS 16 requests uplink bandwidth on a per connection basis (implicitly identifying the service flow).
  • Bandwidth can be granted by the BS to a MS as an aggregate of grants in response to per connection requests from the MS.
  • the MAC common part sublayer (CPS) is classified into radio resource control and management (RRCM) functions and medium access control (MAC) functions.
  • RRCM radio resource control and management
  • MAC medium access control
  • the RRCM functions include several functional blocks that are related with radio resource functions such as:
  • MBS Multicast and Broadcasting Service
  • the Radio Resource Management block adjusts radio network parameters based on traffic load, and also includes function of load control (load balancing), admission control and interference control. Mobility Management
  • the Mobility Management block supports functions related to Intra-RAT / Inter-RAT handover.
  • the Mobility Management block handles the Intra-RAT / Inter-RAT Network topology acquisition which includes the advertisement and measurement, manages candidate neighbor target BSs/RSs and also decides whether the MS performs Intra-RAT / Inter-RAT handover operation.
  • the Network Entry Management block is in charge of initialization and access procedures.
  • the Network Entry Management block may generate management messages which are needed during access procedures, i.e., ranging, basic capability negotiation, registration, and so on.
  • Location Management i.e., ranging, basic capability negotiation, registration, and so on.
  • the Location Management block is in charge of supporting location based service (LBS).
  • the Location Management block may generate messages including the LBS information. Idle Mode Management
  • the Idle Mode Management block manages location update operation during idle mode.
  • the Idle Mode Management block controls idle mode operation, and generates the paging advertisement message based on paging message from paging controller in the core network side.
  • the Security Management block is in charge of authentication/authorization and key management for secure communication.
  • the System Configuration Management block manages system configuration parameters, and system parameters and system configuration information for transmission to the MS.
  • MBS Multicast and BroadcastinR Service
  • the MBS (Multicast Broadcast Service) block controls management messages and data associated with broadcasting and/or multicasting service.
  • the Service Flow and Connection Management block allocates "MS identifiers" (or station identifiers - STIDs) and "flow identifiers" (FIDs) during access/handover/ service flow creation procedures.
  • MS identifiers or station identifiers - STIDs
  • FIDs flow identifiers
  • the Relay Functions block includes functions to support multi-hop relay mechanisms.
  • the functions include procedures to maintain relay paths between BS and an access RS.
  • the Self Organization block performs functions to support self configuration and self optimization mechanisms.
  • the functions include procedures to request RSs/MSs to report measurements for self configuration and self optimization and receive the measurements from the RSs/MSs.
  • the Multi-carrier (MC) block enables a common MAC entity to control a PHY spanning over multiple frequency channels.
  • the channels may be of different bandwidths (e.g. 5, 10 and 20 MHz), be on contiguous or non-contiguous frequency bands.
  • the channels may be of the same or different duplexing modes, e.g. FDD, TDD, or a mix of bidirectional and broadcast only carriers.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the overlapped guard sub-carriers are aligned in frequency domain in order to be used for data transmission.
  • the medium access control includes function blocks which are related to the physical layer and link controls such as:
  • the PHY Control block handles PHY signaling such as ranging, measurement/feedback (CQI), and HARQ ACK/NACK. Based on CQI and HARQ ACK/NACK, the PHY Control block estimates channel quality as seen by the MS, and performs link adaptation via adjusting modulation and coding scheme (MCS), and/or power level. In the ranging procedure, PHY control block does uplink synchronization with power adjustment, frequency offset and timing offset estimation.
  • PHY signaling such as ranging, measurement/feedback (CQI), and HARQ ACK/NACK.
  • CQI measurement/feedback
  • MCS modulation and coding scheme
  • PHY control block does uplink synchronization with power adjustment, frequency offset and timing offset estimation.
  • Control Signaling block generates resource allocation messages.
  • Sleep Mode Management block handles sleep mode operation.
  • the Sleep Mode Management block may also generate MAC signaling related to sleep operation, and may communicate with Scheduling and Resource Multiplexing block in order to operate properly according to sleep period.
  • the QoS block handles QoS management based on QoS parameters input from the Service Flow and Connection Management block for each connection.
  • the Scheduling and Resource Multiplexing block schedules and multiplexes packets based on properties of connections. In order to reflect properties of connections Scheduling and Resource Multiplexing block receives QoS information from The QoS block for each connection.
  • the ARQ block handles MAC ARQ function.
  • ARQ block logically splits MAC SDU to ARQ blocks, and numbers each logical ARQ block.
  • ARQ block may also generate ARQ management messages such as feedback message (ACKTNACK information). Fragmentation/Packing
  • the Fragmentation/Packing block performs fragmenting or packing MSDUs based on scheduling results from Scheduling and Resource Multiplexing block.
  • the MAC PDU formation block constructs MAC PDU so that BS/MS can transmit user traffic or management messages into PHY channel.
  • MAC PDU formation block adds MAC header and may add sub-headers.
  • the Multi-Radio Coexistence block performs functions to support concurrent operations of IEEE 802.16m and non-IEEE 802.16m radios collocated on the same mobile station.
  • the Data Forwarding block performs forwarding functions when RSs are present on the path between BS and MS.
  • the Data Forwarding block may cooperate with other blocks such as Scheduling and Resource Multiplexing block and MAC PDU formation block.
  • the Interference Management block performs functions to manage the inter- cell/sector interference.
  • the operations may include:
  • the Inter-BS coordination block performs functions to coordinate the actions of multiple BSs by exchanging information, e.g., interference management.
  • the functions include procedures to exchange information for e.g., interference management between the BSs by backbone signaling and by MS MAC messaging.
  • the information may include interference characteristics, e.g. interference measurement results, etc.
  • Fig. 11 shows the user traffic data flow and processing at the BS 14 and the MS 16.
  • the dashed arrows show the user traffic data flow from the network layer to the physical layer and vice versa.
  • a network layer packet is processed by the convergence sublayer, the ARQ function (if present), the fragmentation/packing function and the MAC PDU formation function, to form MAC PDU(s) to be sent to the physical layer.
  • a physical layer SDU is processed by MAC PDU formation function, the fragmentation/packing function, the ARQ function (if present) and the convergence sublayer function, to form the network layer packets.
  • the solid arrows show the control primitives among the CPS functions and between the CPS and PHY that are related to the processing of user traffic data.
  • Fig. 12 shows the CPS control plane signaling flow and processing at the BS 16 and the MS 14.
  • the dashed arrows show the flow of control plane signaling from the control plane functions to the data plane functions and the processing of the control plane signaling by the data plane functions to form the corresponding MAC signaling (e.g. MAC management messages, MAC header/sub-header) to be transmitted over the air.
  • the dashed arrows show the processing of the received over-the-air MAC signaling by the data plane functions and the reception of the corresponding control plane signaling by the control plane functions.
  • the solid arrows show the control primitives among the CPS functions and between the CPS and PHY that are related to the processing of control plane signaling.
  • the solid arrows between M_SAP/C_SAP and MAC functional blocks show the control and management primitives to/from Network Control and Management System (NCMS).
  • NCMS Network Control and Management System
  • the primitives to/from M_SAP/C_SAP define the network involved functionalities such as inter-BS interference management, inter/intra RAT mobility management, etc, and management related functionalities such as location management, system configuration etc.
  • Fig 13 shows a generic protocol architecture to support a multicarrier system.
  • a common MAC entity may control a PHY spanning over multiple frequency channels. Some MAC messages sent on one carrier may also apply to other carriers.
  • the channels maybe of different bandwidths (e.g. 5, 10 and 20 MHz), be on contiguous or non-contiguous frequency bands.
  • the channels may be of different duplexing modes, e.g. FDD, TDD, or a mix of bidirectional and broadcast only carriers.
  • the common MAC entity may support simultaneous presence of MSs 16 with different capabilities, such as operation over one channel at a time only or aggregation across contiguous or non-contiguous channels.
  • any mobile station 16 that intends to enter the system needs to establish time and frequency synchronization with a base station 14 that is transmitting signals, as well as obtain identification information (such as the cell ID) of the transmitting device, which in most cases is a base station 14.
  • the mobile station 16 must thus synchronize to the base station 14 and detect certain base station parameters, such as the cell ID.
  • the cell K) is generally obtained by detecting a preamble used by the certain base station 14 that is inserted into each signal frame that is issued from the base station 14.
  • the transmitting device will be described herein as being a base station 14, it should be appreciated that the transmitting device could also be a relay station 15.
  • preambles may provide at least one of the following operations: fast base station access, base station identification/selection and C/I ratio measurement, framing and timing synchronization, frequency and sampling clock offset estimation and initial channel estimation.
  • a frame preamble is designed in order to have minimized overhead in order to provide greater spectral efficiency and radio capacity.
  • the frame structure is such that new preamble configuration is desirable. It is possible for this configuration to provide relative timing of primary secondary preambles, use of a primary synchronisation channel to convey other information to the mobile (including signalling timing/ location of secondary preamble, group ID (specifically to a group of localized cells), bandwidth and/ or multi-carrier structure, legacy system parameters, other information useful to the mobile), structure and/ or position of the synchronization channels relative to multi-carrier structures, specific code structure for mobile base/relay stations, relative timing options for preambles and superframe header.
  • each frame in an OFDM signal is provided with at least a first preamble and a second preamble.
  • the first preamble is designed such that the overall searching for the first preamble and the second preamble is relatively fast and requires less computational complexity than existing preamble designs.
  • the first preamble and the second preamble may be used for coarse timing and frame synchronization, cell ED identification and frequency synchronization.
  • the first and second preambles may also support frequency domain fine frequency synchronization.
  • the control information is conveyed on the preamble, reduced ambiguity in timing of primary and secondary synchronization channels is provided, the number of total cell IDs is increased, and there is less ambiguity in multicarrier preamble placements.
  • the first preamble and the second preamble provide first and second synchronization sequences that enable a mobile station to gain access to a base station or to a plurality of base stations. At least one of the first and second preambles may coexist with the existing legacy preamble, or replace the legacy preamble.
  • legacy preamble is intended to include the prior art preamble in an OFDMA frame, as described in IEEE802.16-2004.
  • the first preamble comprises a first synchronization sequence capable of conveying information.
  • at least a portion of the first synchronization sequence is capable of conveying a "cell group ID" that is associated to a group of base stations.
  • the group of base stations may be grouped together on the basis of geography or a common characteristic, such as being mobile base stations, among other possibilities.
  • the first synchronization sequence of the first preamble may further convey additional information relating to different attributes or parameters associated with the transmitting base station 14 or the certain group of base stations to which the transmitting base station 14 belongs.
  • the first synchronization sequence may also contain certain control information that is intended to be conveyed to a mobile device 16.
  • the second preamble comprises a second synchronization sequence that conveys information indicative of a "local ID" associated to the transmitting base station 14 within the group of base stations.
  • the first synchronization sequence and the second synchronization sequence convey a unique cell ID of the transmitting base station.
  • the combination of the first synchronization sequence and the second synchronization sequence may also convey certain control information to a mobile device 16.
  • FIG. 14 Shown in Figure 14 is a non-limiting example of an OFDM signal 1400 employed by the present invention.
  • This OFDM signal 1400 is sent as a plurality of sequential OFDM frames 1402 or blocks that typically contain 1000 bits of data.
  • Each OFDM frame 1402 comprises a number of subframes, which have been numbered 1404a-e in the non-limiting example illustrated. It should be appreciated that each OFDM frame 1402 could include a different number of subframes 1404.
  • the subframes are allocated for preambles, headers or OFDM symbols, as will be described in more detail below. Futhremore, the subframes could be on different subcarriers.
  • subframe 1404a contains the first preamble, which comprises the first synchronization sequence 1406 and subframe 1404c contains the second preamble which comprises the second synchronization sequence 1408.
  • Subframe 1404b contains a header.
  • Subframes 1404d and 1404e contain the OFDM symbols, which are used to transmit voice data, video data, control information or any other data of information intended to be transmitted to a receiving mobile station 16 over the wireless network.
  • the relative position or location within the OFDM frame of the preambles, header and OFDM signals can be fixed for each OFDM frame or can vary from one OFDM frame to the next.
  • the first preamble (“preamble 1") can be sent on the first subframe and the second preamble (“preamble 2") can be sent on the second subframe.
  • the second preamble it is possible for the second preamble to be positioned before the first preamble.
  • the first preamble is sent on a subframe immediately following the subframe containing the second preamble.
  • the header is sent on the subframe immediately following the second preamble.
  • the header is a superframe header, such that it is not included within each frame, and instead is only included within every fourth or fifth frame, for example.
  • the first preamble and the second preamble may be adjacent to one another, or separated by sub frames containing OFDM symbols.
  • the first preamble is designed to convey information indicative of the location within the frame of the second preamble, hi this manner, when the OFDM frames are received at a mobile station 16, it is easier and faster for the receiving mobile station 16 to search for, and locate, both the first and second preambles.
  • the information indicative of the location, or relative location, within the OFDM frame of the second preamble is generally carried via the first synchronization sequence of the first preamble. More specifically, the first synchronization sequence is able to convey information indicative of the location of the second preamble within the OFDM frame.
  • the first synchronization sequence may convey information indicative of a relative timing between the first preamble and the second preamble, or the first synchronization sequence may convey information indicative of an offset or relative location between the first preamble and the second preamble. Based on this information a mobile station 16 that receives the OFDM signal is able to quickly determine where to look in an OFDM frame for the second preamble, thereby greatly reducing the time and computational complexity necessary to find the second preamble and establish synchronization with the base station 14 and identify the unique Cell ID of the transmitting base station 14. [0121] As mentioned above, the first preamble carries the information indicative of the location within the OFDM frame of the second preamble using a first synchronization sequence.
  • the first preamble may use 1 of 40 synchronization sequences, wherein the synchronization sequence is made up of a first portion that provides 1 of 10 possible "cell group IDs" and a second portion that provides 1 of 4 possible offsets between the first preamble and the second preamble.
  • the synchronization sequence is made up of a first portion that provides a "cell group DD" of a group of base stations to which the transmitting base station belongs, and a second portion that provide an indication of an "offset" between the first preamble and the second preamble.
  • the receiving mobile station 16 will not have to search each subframe position for the second preamble. Instead, the mobile station 16 will know exactly where to look, thereby reducing the searching complexity.
  • the first synchronization sequence may further comprise a third portion that conveys other information, which could be control information or information indicative of an attribute or parameter associated with the group of base stations.
  • the third portion could also convey information indicative of a relative location of the header or superframe header, or the relative position between the first preamble and a legacy frame, among other possibilities.
  • the second preamble comprises a second synchronization sequence that conveys a "local E)" associated with the transmitting base station within the group of base stations.
  • the second synchronization sequence could use 1 of
  • sequences that are each respectively associated with a different base station in the group of base stations.
  • first portion of the first synchronization sequence which indicates a group of base stations
  • second synchronization sequence which indicates the transmitting base station within the group
  • the second synchronization sequence may simply carry the local ID of the transmitting base station 16, or alternatively may carry additional information as well.
  • the second synchronization may comprise a first portion that carries the "local ID" of the transmitting base station 16, and a second portion that carries additional information, such as control information, or a portion of control information that when combined with a portion of the first synchronization sequence conveys control information.
  • the first synchronization sequence belongs to a first set of synchronization sequences and the second synchronization sequence belongs to a second set of synchronization sequences.
  • the first set of synchronization sequences is preferably smaller than the second set of synchronization sequences, in order to facilitate the ease and speed of searching for the first preamble.
  • the first synchronization sequence belongs to a set of 40 synchronization sequences and the second synchronization sequence belongs to a set of 114 synchronization sequences. This facilitates faster searching for the primary sequence, and given that the primary sequence provides the location within the signal frame of the second preamble, the overall time and complexity required for searching for both the first and second preambles is greatly reduced.
  • the first synchronization sequence includes at least a portion that conveys a "cell group ID".
  • a group of base stations such as a local cluster of base stations
  • the "cell group ID" portion of the synchronization sequence is common to every base station within that group of base stations.
  • the synchronization of a mobile station 16 with a transmitting base station 14 can be facilitated by the use of macro-diversity, wherein all of the base stations within a group of base stations issue signal frames having the same "cell group E)" sequence at the same time over the same resources.
  • a receiving mobile station 16 is able to identify the commonly issued sequence, and thus the first preamble, with greater ease. Once the first preamble has been identified, the receiving mobile station 16 can then identify the location of the second preamble within the OFDM signal frame, which gives the "local ID" of the transmitting base station such that the base stations within the group can be differentiated. The receiving mobile station 16 then knows the unique Cell ID of the transmitting base station 14. [0128] Referring back to Figure 1, it is possible for some of the base stations 14 and/or relays 15 to be mobile, such that they are moving transmitters.
  • the mobile base stations 14 and/or relays 15 may be associated with a dedicated "cell group ID” sequence. Moreover, one or more "cell group IDs" from the set of "cell group IDs” may be reserved for these moving transmitters, so as to be able to differentiate them from the fixed base stations 14 and relays 15. In this manner, a mobile station 16 that receives signals from these moving transmitters can detect that they are moving on the basis of the "cell group ID" sequence.
  • a "cell group ED" sequence may be associated with both mobile base stations 14 and relays 15, or the mobile base stations 14 and mobile relays 15 may be associated with different "cell group ID" sequences, such that a receiving mobile station 14 can detect whether it is receiving from either a base station 14 or a relay 15.
  • the first and second preambles may be confined to being transmitted over one or more carrier frequencies in certain predefined manners. For example, at least a portion of one of the first and second preambles may be carried by a synchronization channel that is subject to the following conditions:
  • the synchronization channel may be confined to a fixed bandwidth within a carrier frequency, which may be the minimum carrier frequency.
  • the synchronization channel may be fixed at 5MHz;
  • the synchronization channel may be restricted to being present only over a primary carrier frequency that is able to carry control information
  • the synchronization channel may be restricted to being aligned with one edge of the carrier frequency
  • the synchronization channel may be restricted to being sent over only the smaller one of the multi-carrier frequencies.
  • Figures 15(a) through 15(c) are some graphical representations of the synchronization channel in relation to one or more carrier frequency channels that illustrate the above restrictions.
  • the synchronization channel has the same bandwidth as the primary carrier frequency (which is restricted to 5MHz), and is aligned with both edges of the primary carrier frequency.
  • Shown in Figure 15(b) is a primary carrier frequency that has a greater bandwidth than the synchronization channel.
  • the synchronization channel has a fixed bandwidth and is aligned with one edge of the primary carrier frequency.
  • the synchronization channel is carried over the primary carrier frequency, which is able to carry control information.
  • the secondary carrier frequency is shown without the synchronization channel.
  • the primary carrier frequency is able to carry control information, whereas the secondary carrier frequency is not.
  • Shown in Figure 15(c) are two primary carrier frequencies.
  • the synchronization channel is carried over the smaller of the two primary carrier frequencies, and the secondary carrier is without a synchronization channel.
  • both of the primary carrier frequencies carry a synchronization channel. In such a case, the first primary carrier frequency would have a greater bandwidth that the synchronization channel.
  • first and second preambles may be carried by primary and secondary synchronization channels that are transmitted over one or more carrier frequencies according to certain predefined conditions.
  • the primary and secondary synchronization channels may be subject to the following conditions:
  • the primary synchronization channel may be confined to a fixed bandwidth that may be the minimum carrier frequency, such as 5MHz.
  • the secondary synchronization channel can have a wider bandwidth, that includes the entire bandwidth of the carrier frequency;
  • the primary and secondary synchronization channels may be restricted to being present only over a primary carrier frequency that is able to carry control information.
  • the secondary synchronization channel may be present on all carrier frequencies;
  • the primary synchronization channel may be restricted to being aligned with one edge of the carrier frequency
  • the primary synchronization channel may be restricted to being sent over only the smaller one of the multi-carrier frequencies, whereas, the secondary synchronization channel may be present on all carrier frequencies.
  • Shown in Figures 16(a) through 16(c) are some graphical representations of the primary and secondary synchronization channels in relation to one or more carrier frequency channels. As shown in Figure 16(a), both the first and second synchronization channels have the same bandwidth (which is restricted to 5MHz) as the primary carrier frequency. In addition, both the first and second synchronization channels are aligned with an edge of the primary carrier frequency. Shown in Figure 16(b) are both the primary and secondary synchronization channels carried over the primary carrier frequency.
  • the primary synchronization channel is restricted to the 5MHz bandwidth, whereas the secondary synchronization channel has a greater bandwidth, which is the bandwidth of the primary carrier frequency. Both the primary and secondary synchronization channels are aligned with one edge of the primary carrier frequency. Shown in Figure 16(c) is a multi-channel embodiment, wherein the secondary synchronization channel is carried over the larger of the two primary carrier frequencies and the primary synchronization channel is carried over the smaller of the two primary carrier frequencies. The secondary carrier frequency is shown without a synchronization channel.
  • FIG. 17 Shown in Figure 17 is a flow diagram illustrating the process used by the one or more processing modules in order to generate and position within a signal frame the first and second preambles.
  • the process involves determining a first location within the signal frame that a first preamble should be located and determining a second location within the signal frame that a second preamble should be located. This determination can be done based on a variety of criteria, such as the frame length, the channel conditions, weather or not a superframe header is included, etc. As mentioned above, the second preamble may be positioned within the signal frame at a location prior to the first preamble.
  • the process involves generating the first preamble.
  • the first preamble comprises a first synchronization sequence that includes at least a first portion that provides a "cell group ID" and a second portion that provides information indicative of the location of the second preamble within the signal frame.
  • the first preamble is generated at least in part on the basis of the determined location of the second preamble.
  • the first portion of the first synchronization sequence, which provides the "cell group ID” may be known to the base station, such that the synchronization sequence indicative of the "cell group ID" is included within each signal frame that is issued by the base station 14.
  • the synchronization sequence associated with the "cell group ID” is provided to the base station by the base station controller.
  • a look-up table located either locally or remotely is accessed in order to determine the synchronization sequence associated with the "cell group
  • the synchronization sequence associated with the "cell group ID" may be determined on a basis of the cell group ID, a characteristic of the transmitting base station, such as the geographical coordinates of the base station, the local ID of the base station, or any other possible characteristic or attribute known to the transmitting base station.
  • the second portion of the first synchronization sequence which provides information indicative of a location within the signal frame of the second preamble, is established on the basis of the location determined at step 1702 for the second preamble. For example, a different sequence portion is associated with each of the different possible locations within the signal frame where the second preamble could be located. In the example given above, the second preamble could be located at 1 of 4 different offset positions in relation to the first preamble. Each one of the offset positions can be associated with a respective one of four possible synchronization sequence portions. As such, on the basis of the offset position, the corresponding synchronization sequence portion is determined and added to the first synchronization sequence. The corresponding synchronization sequence portion can be determined on the basis of a look-up table (located either locally or remotely) that maps different offset positions to different synchronization sequence portions.
  • the process of generating the first preamble may further comprises adding additional information that conveys different attributes and/or properties relating to the transmitting base station or the group of base stations to which the transmitting base station belongs.
  • the first preamble could also convey control information. This additional information conveyed by the first preamble could be carried via other synchronization sequence portions, among other possibilities.
  • the first preamble is inserted within the signal frame at the first location determined at step 1702, and at step 1708 the second preamble is inserted within the signal frame at the second location determined at step 1702.
  • the second preamble is generated in much the same way as the first preamble.
  • the second preamble comprises a second synchronization sequence that conveys a local ID associated with the transmitting base station.
  • This second synchronization sequence indicative of the local ID may be known by the transmitting base station, such that it is included within each signal frame that is issued by the base station 14.
  • the signal frame is caused to be issued towards a receiving mobile station 16 in the wireless network.
  • the wireless signal that has been issued over the wireless network by the transmitting base station is received by a receiving mobile station 16.
  • the manner in which the signal frame is handled by the receiving mobile station 16 will now be described in more detail with respect to Figures 3 and 18.
  • the receiving circuitry 38 receives the signals issued over the wireless network and passes those signals to the baseband processor 34.
  • One or more processing modules at the control entity 32 and/or baseband processor 34 are then able to search for and identify the first and second preambles contained within a given signal frame.
  • FIG. 18 Shown in Figure 18 is a flow diagram illustrating the process of receiving and identifying the first and second preambles within a signal frame.
  • the wireless signal comprising a plurality of signal frames is received at the receiving circuitry 38.
  • Each of the signal frames comprises a first preamble and a second preamble.
  • one or more processing modules at the baseband processor 34 and/or control entity 32 identify the first synchronization preamble within a signal frame.
  • the identification of the first synchronization signal may be done by identifying a repetitively occurring synchronization sequence (which will be at least a portion of the first synchronization sequence) that is contained in each of the signal frames.
  • the first synchronization sequence may be 1 of 40 possible synchronization sequences that are known to the receiving mobile station 16. As such, the receiving mobile station will "look out” for repetitively occurring ones of these known sequences in received signals. Once one of the sequences is detected within a signal frame, the receiving mobile station 16 will know that the first preamble has been detected, such that frame frequency and timing synchronization can be performed. Furthermore, once the first synchronization sequence has been detected, the receiving mobile station 16 can determine both the "cell group K)" and the location of the second preamble.
  • the first synchronization sequence comprises a first portion that provides the "cell group ID", and a second portion that provides an indication of the location of the second preamble.
  • the receiving mobile station 16 may compare the first synchronization sequence (or the first and/or second portions thereof) with known sequences contained in a look-up table that map synchronization sequences (or portions thereof) to cell group IDs and different offset or timing locations within the signal frame. By comparing the detected first synchronization sequence (or portions thereof) with sequences contained in the look-up table, the "cell group ID" and the offset or timing between the first and second preambles may be determined.
  • the first portion of the synchronization sequence itself may be the "cell group ID".
  • the location of the second preamble within a signal frame is identified on the basis of information conveyed by the first preamble, and specifically on the information carried by at least a portion of the first synchronization sequence. [0147] In this manner, at step 1806, the location of the second preamble within a signal frame can be identified on the basis of information conveyed by the first preamble. This greatly reduces the searching complexity associated with identifying the location of the second preamble. Once the location has been identified, the receiving mobile station 16 is able to access the second preamble which conveys information indicative of a local ID.
  • the information indicative of the local ID of the transmitting base station can be carried by a second synchronization sequence.
  • the local ID of the transmitting base station may be the second synchronization sequence, or a look-up table can be accessed that maps known second synchronization sequences to respective local IDs of various transmitting base stations within the group of base stations associated to the cell group ID.
  • transmission signalling information can be obtained from the combination of the first preamble and the second preamble.
  • the transmission signalling information can be the unique Cell ID of the transmitting base station 14.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Synchronisation In Digital Transmission Systems (AREA)
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Abstract

L'invention concerne un procédé et un système de transmission de données dans une trame de signal. Ledit procédé consiste à insérer un premier préambule de synchronisation dans une première zone de la trame de signal et à insérer un deuxième préambule de synchronisation dans une deuxième zone de la trame de signal, le premier préambule de synchronisation convoyant l'information indiquant la deuxième zone. Ledit procédé consiste également à envoyer la trame de signal à un dispositif de réception dans un environnement de communication sans fil.
PCT/CA2010/001032 2009-07-03 2010-07-05 Utilisation de premier et deuxieme preambules dans les signaux de communication sans fil WO2011000109A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
KR1020127003155A KR101614982B1 (ko) 2009-07-03 2010-07-05 무선 통신 신호들 내의 제1 및 제2 프리앰블들의 사용
BR112012000075A BR112012000075A8 (pt) 2009-07-03 2010-07-05 Uso de primeiro e segundo preâmbulos em sinais de comunicação sem fio
EP10793486.1A EP2449832A4 (fr) 2009-07-03 2010-07-05 Utilisation de premier et deuxieme preambules dans les signaux de communication sans fil
RU2012103043/08A RU2541929C2 (ru) 2009-07-03 2010-07-05 Способ и устройство передачи и приема данных в сигнальном фрейме
CA2773945A CA2773945C (fr) 2009-07-03 2010-07-05 Utilisation de premier et deuxieme preambules dans les signaux de communication sans fil
JP2012517991A JP5830016B2 (ja) 2009-07-03 2010-07-05 送信方法、受信方法、生成方法、送信装置及び受信装置
CN201080039186.1A CN102550096B (zh) 2009-07-03 2010-07-05 在无线通信信号中对第一和第二前导的使用
HK13100135.1A HK1173025A1 (en) 2009-07-03 2013-01-04 The use of first and second preambles in wireless communication signals

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US8488634B2 (en) 2008-07-07 2013-07-16 Apple Inc. Use of first and second preambles in wireless communication signals
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CN102550096A (zh) 2012-07-04
BR112012000075A8 (pt) 2017-09-19
CA2773945A1 (fr) 2011-01-06
JP2013510451A (ja) 2013-03-21
CA2773945C (fr) 2016-03-29
EP2449832A1 (fr) 2012-05-09
HK1173025A1 (en) 2013-05-03
RU2541929C2 (ru) 2015-02-20
JP5830016B2 (ja) 2015-12-09
KR101614982B1 (ko) 2016-04-22
EP2449832A4 (fr) 2017-07-12
BR112012000075A2 (pt) 2017-07-25
KR20140020176A (ko) 2014-02-18
CN102550096B (zh) 2015-07-08

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