WO2008003227A1 - Procédé et appareil de transmission et de réception de données mbms évolutionnelles - Google Patents

Procédé et appareil de transmission et de réception de données mbms évolutionnelles Download PDF

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Publication number
WO2008003227A1
WO2008003227A1 PCT/CN2007/001953 CN2007001953W WO2008003227A1 WO 2008003227 A1 WO2008003227 A1 WO 2008003227A1 CN 2007001953 W CN2007001953 W CN 2007001953W WO 2008003227 A1 WO2008003227 A1 WO 2008003227A1
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WO
WIPO (PCT)
Prior art keywords
cell group
scrambling code
data
signal
multimedia broadcast
Prior art date
Application number
PCT/CN2007/001953
Other languages
English (en)
French (fr)
Inventor
Yonggang Wang
Yu Chen
Hua Chao
Nan Wang
Zhongji Hu
Pingping Xing
He Wang
Original Assignee
Alcatel Lucent
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 Alcatel Lucent filed Critical Alcatel Lucent
Priority to US12/306,630 priority Critical patent/US8964620B2/en
Priority to EP07721526.7A priority patent/EP2040430A4/en
Priority to EP15168385.1A priority patent/EP2955892B1/en
Priority to JP2009516861A priority patent/JP5320288B2/ja
Priority to KR1020087031037A priority patent/KR101388947B1/ko
Publication of WO2008003227A1 publication Critical patent/WO2008003227A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems

Definitions

  • the present invention relates to the field of mobile communication based on Orthogonal Frequency Division Multiple Access (OFDMA) Third Generation Partnership Project (3GPP) Long Term Evolution (LTE), and more particularly to the evolution of Universal Mobile Telecommunications System (UMTS) radio access.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • 3GPP Third Generation Partnership Project
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) project is the largest new technology development project initiated by 3GPP in the past two years. Since in 3GPP LTE, the downlink technology adopts a completely different physical layer transmission technology, that is, an Orthogonal Frequency Division Multiplexing (OFDM) transmission method, therefore, E-MBMS and WCDMA (Wideband Code Division Multiple Access) in this environment Compared to MBMS in the Release 6 protocol, there are many different new features.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the downlink transmission scheme uses traditional orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP), and each subcarrier occupies 15 kHz.
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • the cyclic prefix has a duration of 4.7/16.7 s, which corresponds to a short CP and a long CP.
  • the long CP is for the multimedia broadcast/multicast service for multi-cell transmission and the macro-cell environment where some base stations are spaced apart.
  • the transmission of the MBMS service can be delivered in two ways, one is multi-cell transmission, and the other is single-cell transmission.
  • the MBMS service is in multi-cell transmission, both the cell and the data content are synchronized, so that the user terminal (UE) can combine the energy on multiple radio links without increasing the complexity of the receiver.
  • the above merger is a related merger, also known as radio frequency (RF) consolidation.
  • RF combining requires that all signals arriving at the UE receiver are within the window defined by the CP, thus requiring strict synchronization between cells.
  • RF combining of signals can be performed.
  • the signal arriving at the UE receiver may fall outside the CP window, and these signals may cause interference between symbols.
  • the broadcast service is identical in both pilot and data content, the signal is strongly correlated. If the signal falls outside the CP window, the resulting inter-cell interference will affect the pilot estimation and data reception, so This has attracted attention.
  • the 3GPP LTE standard states:
  • Downlink reference signal can be used
  • the reference symbol also referred to as the first reference symbol
  • the reference symbol is located at the first OFDM symbol position of the subcarrier assigned to the downlink data transmission.
  • An additional reference symbol also referred to as a second reference symbol, is located at the third last of the subcarriers assigned to the downstream data transmission.
  • the reference symbols and additional reference symbols may be different symbols and have different repetition frequencies.
  • the selected scrambling code may be one cell common scrambling code in which all cells are identical to each other, or may be a cell-specific scrambling code in which each cell is different from each other.
  • the pilot and/or data are scrambled and transmitted using the selected scrambling code.
  • the pilot and data structures after this scrambling are shown in Figures 2A, 2B and 2C, respectively.
  • the above three figures respectively show data structures obtained by scrambling different scrambling codes, wherein the abscissa represents the time domain, the ordinate represents the frequency domain, and each of the rectangles represents a symbol.
  • 2A shows a pilot and data structure obtained by selecting a cell common scrambling code to scramble a pilot.
  • FIG. 2B shows a pilot and data structure obtained by selecting a cell common scrambling code and a cell-specific scrambling code to scramble the pilots respectively.
  • 2C shows a pilot and data structure obtained by selecting a cell-specific scrambling code to scramble a pilot and selecting a traffic scrambling code to scramble data of different services in the MBMS.
  • the above existing digital transmission method can scramble pilots and data, they are premised on the assumption that all evolved Node Bs (E-NodeBs) can be strictly synchronized. In this case, the channel of the surrounding cell can fall within the CP window when it reaches the UE receiver. Even if there is leakage outside the CP window, the influence of its power on the receiver interference is considered to be negligible.
  • E-NodeBs evolved Node Bs
  • the signal arriving at the UE receiver may fall outside the CP window.
  • the broadcast service is identical in both pilot and data content, the signal is strongly correlated, and the resulting inter-cell interference affects pilot estimation and data reception.
  • the signal arriving at the UE receiver may fall outside the CP window, thereby causing interference problems.
  • the applicant is based on the synchronization, downlink macro diversity and UE reception of the E-NodeB in the evolved UTRAN.
  • it is proposed to divide a plurality of cells into cell groups to solve the above problem.
  • a scheme for dividing an MBMS cell group in the E-UTRAN is specifically proposed. The scheme divides all cells into a number of MBMS cell groups according to the radio wave propagation delay. Each cell group contains a number of E-NodeBs and cells/sectors belonging to these E-NodeBs.
  • the area covered by a cell group has a diameter equal to or slightly smaller than the distance traveled by a long CP window time wave, that is, when the UE is located within a cell group, all signals sent from the E-NodeB of the cell group arrive at the UE. They are all within the CP window.
  • a long CP window time wave that is, when the UE is located within a cell group, all signals sent from the E-NodeB of the cell group arrive at the UE. They are all within the CP window.
  • E-MBMS Multimedia Broadcasting and Multicast Service
  • MBMS Multimedia Broadcasting and Multicast Service
  • OFDM Orthogonal Frequency Division Multiplexing
  • the downlink signal mainly uses a conventional OFDM signal with a cyclic prefix (CP).
  • CP cyclic prefix
  • Each subcarrier occupies 15 kHz bandwidth, and the cyclic prefix has a duration of 4.7 or 16.7 s, corresponding to a short cyclic prefix and a long cyclic prefix, respectively.
  • the long cyclic prefix is mainly applied to the multimedia broadcast/multicast service of multi-cell transmission and the macro cell environment with large base station spacing.
  • the multicast service and the unicast service are transmitted by time multiplexing, or the two are respectively transmitted on different carriers.
  • the multicast service adopts a separate long cyclic prefix;
  • long cyclic prefixes are also used to prioritize the needs of multicast services.
  • the environment includes:
  • BU bad urban environment
  • the time references of the base stations are independent of each other, and there is a certain time drift between the cells.
  • An absolute design accuracy requirement is: The drift of the time interval of the small interval must be less than ⁇ 0.05 ppm.
  • the relative time drift of two cells in the E-UTRAN system reaches the size of a window defined by a long cyclic prefix (16.7 s) every 3 minutes.
  • a long cyclic prefix (16.7 s) every 3 minutes.
  • the system is a synchronous system, if the wireless propagation environment is under the BU and the cell base station spacing is 1.732 km, the signal of the same content sent from the different cell base stations reaches the user equipment. The moment does not necessarily fall within the window defined by the cyclic prefix.
  • BU is a typical urban channel environment in the COST 207 model adopted by 3GPP LTE.
  • the base station spacing of 1.732km is a poor macro cell configuration mode adopted by 3GPP LTE.
  • the 5th radius of the signal has a main path of 5 ⁇ ⁇ , and its average power is only 2dB lower than the main path.
  • the sixth path delay of the signal reaches the main path of 6.6 s, and its average power. Only 4dB lower than the main path. Therefore, even under a synchronous system, there may be considerable power leakage from other base stations outside the cyclic prefix window to form an ISI.
  • An object of the present invention is to provide a data transmission method for multimedia broadcast and multicast services based on the above-mentioned MBMS cell group, comprising the following steps: channel coding and data modulation for multimedia broadcast and multicast service data; Dedicated scrambling code for broadcast and multicast service cell groups; Determining multimedia broadcast and multicast service cell-specific scrambling codes; For cell-coded and data-modulated multimedia broadcast and multicast service data, using cell group-specific scrambling codes for multimedia broadcasts And the multicast service data is scrambled, and the reference signal scrambled by the cell group dedicated scrambling code and the reference signal scrambled by the cell dedicated scrambling code are added; and the scrambled multimedia broadcast and multicast service reference signals and data are sent. .
  • a multimedia based on dividing a cell group includes the following steps: receiving the scrambled multimedia broadcast and multicast service reference signals and data; determining a multimedia broadcast and multicast service cell group dedicated scrambling code for descrambling; De-scrambling multimedia broadcast and multicast service cell-specific scrambling code; descrambling the reference signal and data of the received multimedia broadcast and multicast service using the determined scrambling code; and descrambling multimedia broadcast and multicast
  • the reference signal and data of the service are subjected to channel decoding and data demodulation.
  • a transmitting apparatus for dividing multimedia broadcast and multicast service data of a cell group environment includes: a channel coding and data modulating apparatus for multimedia broadcast and multicast The service data performs channel coding and data modulation; the cell group dedicated scrambling code determining apparatus is configured to determine a multimedia broadcast and a multicast service cell group dedicated scrambling code; and the cell dedicated scrambling code determining apparatus is configured to determine a multimedia broadcast and a multicast service cell dedicated a scrambling device, configured to scramble the multimedia broadcast and multicast service data by using the cell group-specific scrambling code for the multimedia broadcast and multicast service data after channel coding and data modulation, and join the cell group-specific a scrambled scrambled reference signal and a reference signal scrambled by the cell-specific scrambling code; and a scrambled data transmitting apparatus for transmitting the scrambled multimedia broadcast and multicast service reference signals and
  • a receiving apparatus for multimedia broadcast and multicast service data for dividing an environment of a cell group including: a scrambling signal receiving apparatus, configured to receive a scrambled multimedia broadcast and a group Broadcasting service reference signal and data; cell group descrambling code determining means for determining a multimedia broadcast and multicast service cell group dedicated scrambling code for descrambling; cell descrambling code determining means for determining descrambling a multimedia broadcast and multicast service cell dedicated scrambling code; a descrambling device, configured to descramble the reference signals and data of the received multimedia broadcast and multicast service by using the determined cell group dedicated scrambling code and the cell dedicated scrambling code; Channel decoding and data demodulating means for channel decoding and data demodulation of reference signals and data of the descrambled multimedia broadcast and multicast services.
  • the present invention also provides a Node B including the above-described transmitting device, a user terminal including the above-mentioned receiving device, and a system including such a Node B and a User Terminal.
  • a wireless device divided into a plurality of cell groups A method for merging received multi-path multicast signals from a plurality of network nodes in a user equipment of a network, wherein the plurality of network nodes belong to different cell groups, and the method includes the following steps And performing correlation combining on the received multicast signal of the cell group-specific scrambling code to which the user equipment belongs in the spatial combining signal of the received multi-path multicast signal to generate a related combined signal of the home cell group; Multicast signals with different scrambling codes in the signal are combined for non-correlated symbols to generate a symbol combining signal.
  • a user equipment for performing a combining process on a received multi-path multicast signal from a plurality of network nodes in a wireless network including: a related combining device, is provided for Generating a multicast signal having the same scrambling code in a spatial combined signal of the multiplexed multicast signal to perform correlation combining to generate a correlated combined signal; a symbol combining means for multicasting different scrambling codes in the spatial combined signal
  • the signals are combined with non-correlated symbols to generate a symbol combining signal.
  • a method for transmitting a multicast signal in a wireless network divided into a plurality of cell groups wherein each cell group includes a plurality of network nodes and cells under its jurisdiction, and features thereof
  • the network node of each cell group scrambles the signal to be transmitted by using the same dedicated scrambling code.
  • a wireless network for transmitting a multicast signal which is divided into a plurality of cell groups, wherein each cell group includes a plurality of network nodes and a cell under the jurisdiction thereof, is characterized in that: The network node of each cell group scrambles the signal to be transmitted using the same dedicated scrambling code.
  • a method for scheduling a time domain resource for a multicast service in an access device of a wireless network divided into a plurality of cell groups is provided, characterized in that the pair is distributed to the jurisdiction
  • the unicast service and the multicast service of the group alternately allocate time domain resources when performing time division multiplexing to ensure that at most one cell group transmits multicast services at the same time.
  • an access device for scheduling a time domain resource for a multicast service in a wireless network divided into a plurality of cell groups is provided, characterized in that, in the distribution to the jurisdiction-based cell group Unicast service and multicast service are interleaved when time division multiplexing Time domain resources are allocated to ensure that at most one cell group transmits multicast traffic at the same time.
  • the signal sent by the E-NodeB in the cell group can be combined by RF (correlated soft combining), and the signal sent by the E-NodeB between different cell groups can be symbol-level after the FFT.
  • Soft merge non-correlated soft merge
  • FIG. 1 shows a design of a basic reference signal structure initially discussed in 3GPP LTE
  • FIG. 2A shows a pilot data structure obtained by scrambling pilots by selecting a cell common scrambling code
  • 2B shows a pilot data structure obtained by selecting a cell common scrambling code and a cell-specific scrambling code to scramble pilots respectively;
  • 2C shows a pilot data structure obtained by selecting a cell-specific scrambling code to scramble pilots and data
  • FIG. 3 is a schematic diagram showing MBMS cell group division in LTE proposed by the present applicant;
  • FIG. 4 is a flowchart showing a method for transmitting MBMS data according to an embodiment of the present invention
  • FIG. 6 is a flowchart showing a method of receiving MBMS data according to an embodiment of the present invention
  • FIG. 7 is a diagram showing an internal structure of a data transmitting device according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing the internal structure of a data receiving device according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a wireless network divided into a plurality of multicast cell groups according to an embodiment of the present invention
  • FIG. 10 is a diagram showing multiple received multiplexes from a plurality of base stations in a user equipment of a wireless network divided into a plurality of multicast cell groups according to an embodiment of the present invention; Flow chart of a method for combining multicast signals;
  • FIG. 11 is a block diagram of a user equipment for combining received multi-path multicast signals from a plurality of network nodes in a wireless network divided into a plurality of multicast cell groups according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of a method for alternately allocating time domain resources for unicast services and multicast services according to an embodiment of the present invention
  • Figure 13 is a flow diagram of a method for merging multicast signals employing OFDM signals in accordance with an embodiment of the present invention. detailed description
  • the division of the MBMS cell group in LTE as described above by the Applicant is shown in FIG. Although the example shown here is modeled on a hexagonal cell, the division of the MBMS cell group which is the basis of the present invention is not limited thereto.
  • each cell group contains a number of E-NodeBs (positions in the cell group, represented by small triangles) belonging to the cell group and cells/sectors belonging to these E-NodeBs.
  • the area covered by a cell group has a diameter equal to or slightly smaller than the distance of a long CP window time wave propagation, for example 4 km, so that when the UE is located within a cell group, all signals sent from the E-NodeB of the cell group , when they arrive at the UE, they are all within the CP window.
  • the present application proposes a scheme for scrambling MBMS service data by using a cell group-specific scrambling code, which is common to all E-NodeBs in the cell group, and for different cell groups. It is not the same.
  • the MBMS data is transmitted by the E-NodeB to the UEs in the cell group.
  • MBMS data typically comes from an Access Gateway (AGW) that acts as a core network border node.
  • AGW Access Gateway
  • the E-NodeB performs channel coding and data modulation in step 404.
  • any one of the channel coding methods and data modulation methods in the prior art can be used without limiting the present invention.
  • the E-NodeB transmitting the MBMS data determines the dedicated scrambling code of the cell group to which it belongs and the MBMS cell-specific scrambling code.
  • the dedicated scrambling code of the cell group and the MBMS cell-specific scrambling code can be set in each E-NodeB during system configuration.
  • Each E-NodeB in the determined group of cells can know the cell group-specific scrambling code to which it belongs.
  • any one of the existing conventional scrambling sequences may be used as the small group-specific scrambling code, such as a Gold sequence or a Kasami sequence.
  • the E-NodeB After determining the cell group-specific scrambling code and the MBMS cell-specific scrambling code, in step 408, the E-NodeB will use the determined cell group-specific scrambling code and the MBMS cell-specific scrambling code to perform channel coding and data modulation.
  • the MBMS pilot and/or data are scrambled. Specifically, for the channel-coded and data-modulated MBMS data, the MBMS data is scrambled by using a cell group-specific scrambling code, and the reference signal scrambled by the cell group-specific scrambling code is added, and the cell-specific scrambling code is scrambled. Reference signal. And during the scrambling process, the scrambled pilots are spaced apart from each other, and the scrambled pilots are separated from the associated bandwidth and associated time, taking into account the effectiveness of the data transmission and the impact on the channel response estimation. Compare it.
  • the MBMS data processed by the data transmission method according to the embodiment of the present invention is added. Pilots and numbers scrambled by cell group-specific scrambling codes
  • the schematic diagram is shown in Figure 5.
  • the abscissa represents the time domain
  • the ordinate represents the frequency domain
  • each of the rectangles represents a symbol.
  • One subframe is represented by six symbols along the horizontal axis direction, and the time of each subframe is 0.5 ms.
  • Each horizontal line arranged along the longitudinal axis corresponds to one subcarrier.
  • the channel structure shown in Fig. 5 includes the MBMS cell group dedicated scrambling code scrambled pilot and the additional cell dedicated scrambling code scrambled pilot.
  • the cell-specific scrambling scrambled pilots are used for downlink channel measurements, cell search, and initial acquisition.
  • the MBMS Cell Group Dedicated Scrambling Code Scrambled Pilot can be used for UE related demodulation and detection of downlink channel estimation, as well as downlink branch power level measurements and handovers between cell groups.
  • the MBMS data transmission method scrambles the first reference symbol (pilot) by using the cell group-specific scrambling code, which corresponds to FIG. 5 in FIG.
  • the pilot group scrambled scrambled pilots are mutually spaced; the second reference symbol (pilot) is also scrambled by the cell-specific scrambling code, and the cell-specific scrambling code scramble pilot corresponding to the mutually spaced cells in FIG. .
  • the cell group-specific scrambling code is used for scrambling, and is shown as a rectangle other than the scramble pilot in Fig. 5.
  • both the reference signal and the data are scrambled by using a cell group-specific scrambling code, so that the pilot and data signals sent from the E-NodeB in the group arrive at the UE receiver and are in the CP window.
  • the signal waveforms are the same. Therefore, RF merging can be realized without any operation on the UE side, so that the diversity gain is conveniently obtained.
  • the different cell groups use different cell group-specific scrambling codes. Therefore, after receiving the data from other cell groups, that is, the data scrambled by the dedicated scrambling code of other cell groups, the UE can use the interference.
  • the identification of the code randomizes the signals from the other cell groups so that the UE removes the signals from other cell groups as random white noise.
  • each UE can know the surrounding cell group-specific scrambling code, when the UE moves to the boundary of the cell group, the UE can find that the pilot signal of an interference signal has been strengthened to a certain extent by using the measurement, and can be used as a useful combination.
  • an additional physical layer processing branch is established in the UE receiver to receive this signal, so that the symbols of the two signals are soft combined after the FFT to obtain macro diversity gain.
  • the time difference between the two wireless links does not need to be very strict, such as may be greater than 16.7 ⁇ 8 or greater.
  • strict synchronization and resynchronization procedures need only be implemented between E-NodeBs within a group of cells, and synchronization of such physical layers does not need to be considered between E-NodeBs of different cell groups.
  • the E-MBMS synchronization and resynchronization process will be very simple and efficient.
  • the present invention is not limited to the above cell group division method, but can be applied to any environment in which a plurality of cells are divided into different cell groups. Different divisions of cell groups do not constitute a limitation of the present invention.
  • the present invention further provides a method for receiving E-MBMS data, and a schematic flowchart thereof is shown in FIG. 6.
  • the scrambled E-MBMS data is received by the UE in the E-UTRAN of the evolved UMTS divided by the MBMS cell group described above.
  • step 602 MBMS data scrambled by a cell group-specific scrambling code is received.
  • the UE When the UE is located inside an MBMS cell group, all signals sent from all E-NodeBs of the cell group to which it belongs are located in the CP window when arriving at the UE.
  • the UE When the UE is located at the edge of the cell group, the UE will receive two or more sufficiently strong scrambled MBMS data, respectively, from the cell group to which the current UE is located and the nearest neighbor to the current UE.
  • One or more cell groups One or more cell groups.
  • a descrambling code is determined.
  • the descrambling code is a cell group specific scrambling code and a cell specific scrambling code.
  • the descrambling code is a cell group specific scrambling code and a cell specific scrambling code.
  • Each UE in the determined cell group can know the dedicated scrambling code of the cell group to which it belongs. This is related to correlating the cell group scrambling code sequence stored by the UE receiving the multimedia broadcast and multicast service data with the received scrambled MBMS reference signal and the reference signal and data scrambled by the cell group-specific scrambling code in the data. Calculate, determine the dedicated scrambling code for the cell group.
  • the UE When the UE is located at the edge of the cell group, it knows the dedicated scrambling code of the cell group to which the current location is located (referred to as the first cell group dedicated scrambling code) and the dedicated interference of the cell group closest to the current UE location. Code (referred to as the second cell group dedicated scrambling code).
  • the scramble received for step 602 in step 606 The MBMS data is descrambled.
  • the cell group dedicated scrambling code is used to descramble the pilot and data scrambled by the cell group dedicated scrambling code
  • the cell dedicated scrambling code is used to descramble the pilot scrambled by the cell dedicated scrambling code.
  • the descrambling can be easily accomplished using a dedicated scrambling code of the cell group to which it knows.
  • the UE When the UE is located at the edge of the cell group, it will descramble the received signal with the determined first cell group dedicated scrambling code and store the data from the cell group in which it is located, and utilize the determined second cell group dedicated interference.
  • the code descrambles the received signal and stores data from the nearest neighbor cell group.
  • the above two descrambled signals can be soft-synthesized (non-correlated soft combining) at the symbol level after the FFT in the UE receiver.
  • the descrambled MBMS data is subjected to channel decoding and data demodulation in step 608, thereby obtaining MBMS data in step 610.
  • the flow of the data receiving method shown in Fig. 6 ends.
  • good R combining or soft combining can be achieved regardless of whether the UE is in a cell group or a cell group edge, thereby obtaining a score set gain.
  • the present invention also provides corresponding devices which are applied to an environment in which a cell group is divided similarly to the foregoing.
  • Fig. 7 shows an internal structure of a data transmitting apparatus 700 according to an embodiment of the present invention.
  • the data transmitting apparatus 700 according to the embodiment of the present invention includes a data receiving apparatus 702, a channel encoding and data modulating apparatus 704, a scrambling code determining apparatus 706, a scrambling apparatus 708, and a scrambling signal transmitting apparatus 710.
  • the scrambling code determining means 706 includes a cell group scrambling code determining means 7061 and a cell scrambling code determining means 7062.
  • the data receiving device 702 typically receives MBMS data from an access gateway (AGW) that is a core network border node.
  • AGW access gateway
  • Channel coding and data modulation are performed by channel coding and data modulation means 704 for the MBMS data.
  • the channel coding and data modulation means 704 can use any of the channel coding methods and data modulation methods of the prior art without limiting the invention.
  • the cell group scrambling code determining means 7061 determines to transmit the MBMS data.
  • the dedicated scrambling code of the cell group to which the E-NodeB belongs and the cell scrambling code determining means 7062 determine the cell-specific scrambling code.
  • the dedicated scrambling code of the cell group and the MBMS cell-specific scrambling code can be set in each E-NodeB at the time of system configuration. In the embodiment of the present invention, for each cell group shown in FIG. 3, there are different scrambling codes different from other cell groups. Each E-NodeB in a determined group of cells can know the cell group-specific scrambling code to which it belongs.
  • any one of the existing conventional scrambling sequences may be used as the small group-specific scrambling code, such as a Gold sequence or a Kasami sequence.
  • the MBMS data output by the channel coding and data modulation means 704 is scrambled by the add-on device 708 using the determined code j, the block-specific scrambling code, and the cell-specific scrambling code.
  • the MBMS data is scrambled by using a cell group-specific scrambling code, and the reference signal scrambled by the cell group-specific scrambling code and the cell are added.
  • the scrambled pilots are spaced apart from each other, and the scrambled pilots are separated from the associated bandwidth and associated time, taking into account the validity of the data transmission and the impact on the channel response estimation. Compare it. Thereafter, the scrambled MBMS signal is transmitted by the scrambled signal transmitting means 710.
  • the present invention also provides a data receiving apparatus 800, the internal structure of which is shown in FIG.
  • the data receiving apparatus 800 includes a scrambled signal receiving apparatus 802, a descrambling code determining means 804, a descrambling means 806, a channel decoding and data demodulating means 808, and a data obtaining means 810.
  • the descrambling code determining means 804 includes a cell group descrambling code determining means 8041 and a cell descrambling code determining means 8042.
  • the MBMS data subjected to the addition is received by the scramble signal receiving means 802.
  • the scramble signal receiving means 802. When the UE is located inside an MBMS cell group, the signals sent from all E-NodeBs of the cell group to which it belongs are all within the CP window when arriving at the UE.
  • the scrambling signal receiving device 802 When the UE is located at the edge of the cell group, the scrambling signal receiving device 802 will receive two sufficiently strong scrambled MBMS data, respectively The cell group from which the current UE is located and the cell group closest to the location where the current UE is located.
  • the cell group descrambling code determining means 8041 determines the cell group-specific scrambling code required for descrambling, and the cell descrambling code determining means 8042 determines the cell-specific scrambling code required for descrambling.
  • the cell group scrambling code determining means 8041 adds the cell group scrambling code sequence stored by the UE that receives the multimedia broadcast and multicast service data to the received cell group dedicated scrambling code in the received scrambled MBMS reference signal and data.
  • the scrambled reference signal and data are correlated to determine a dedicated scrambling code for the cell group.
  • the UE When the UE is located at the edge of the cell group, it knows the dedicated scrambling code of the cell group to which the current location is located (referred to as the first cell group-specific scrambling code) and the dedicated interference of the cell group closest to the location where the current UE is located. Code (referred to as the second cell group dedicated scrambling code).
  • the descrambled device 806 descrambles the received scrambled MBMS data.
  • the cell group dedicated scrambling code is used to descramble the reference signal and data scrambled by the cell group dedicated scrambling code
  • the cell dedicated scrambling code is used to descramble the reference signal scrambled by the cell dedicated scrambling code.
  • the descrambling can be easily accomplished by using the dedicated scrambling code of the cell group to which it knows.
  • the UE When the UE is located at the edge of the cell group, it will descramble the received signal with the determined first cell group dedicated scrambling code and store the data from the cell group in which it is located, and utilize the determined second cell group dedicated interference.
  • the code descrambles the received signal and stores data from the nearest neighbor cell group.
  • the two descrambled signals can be soft-combined at the symbol level (non-correlated soft combining) after the FFT in the UE receiver.
  • the descrambled MBMS data is subjected to channel decoding and data demodulation in the channel decoding and data demodulating means 808, whereby the MBMS data is obtained by the data obtaining means 810.
  • the structure of the pilot and service data in the MBMS evolution is obtained on the basis of the MBMS cell group division. Since an MBMS cell group-specific scrambling code is introduced in the scheme according to an embodiment of the present invention, it is included in the pilot signal structure after using the scrambling thereof The pilot of the MBMS cell group dedicated scrambling code scrambled and the additional cell dedicated scrambling code scrambled pilot.
  • the MBMS service data can also be scrambled by the cell group dedicated scrambling code.
  • the signals sent by the E-NodeB in the cell group can be combined by RF (correlated soft combining), and the signals sent by the E-NodeBs between different cell groups can be soft-synthesized at the symbol level after the FFT. (non-related soft merger). Since soft combining is at the symbol level before Turbo decoding after FFT, the requirements for synchronization are relatively loose. Strict physical layer synchronization and resynchronization procedures need only be implemented between E-NodeBs within the cell group.
  • Cyclic prefix window a corresponding time period corresponding to the cyclic prefix of the OFDM symbol. This time period is aptly referred to as a cyclic prefix window. According to whether the time from the signal from a base station finally arrives at the user equipment is within the time period, The signal falls within the cyclic prefix window or falls outside the cyclic prefix window;
  • the invention utilizes the length of the cyclic prefix carried by the downlink OFDM signal, specifically the distance of the radio wave propagation in the cyclic prefix window, to define several cells of the radio network as one cell group, and the distance is usually a cell.
  • Home cell group Which cell group is currently in the control range of the cell group, and which cell group is called the home cell group;
  • the neighboring cell group is adjacent to the cell group corresponding to the current location of the user equipment, and the multicast signal sent by the base station reaches one or more cell groups of a certain strength in the cell group corresponding to the current location of the user equipment;
  • RF merging For multi-cell transmission MBMS services, if the cells are strictly synchronized, that is, all signals arriving at the user equipment receiver fall within the window defined by the cyclic prefix, the user equipment can combine the signals on the multiple links. Without increasing the complexity of the receiver, this combination is called RF consolidation;
  • Dedicated scrambling code There may be multiple base stations in the same cell group. These signals are required to fall within the cyclic prefix window due to RF merging of signals from these base stations. The content and waveform are completely consistent. Therefore, these base stations must use the same scrambling code to scramble the signal. This code is called the dedicated code of the cell group, and different cell groups use different dedicated scrambling codes.
  • the present invention For signals from base stations in a group of neighboring cells, different from the prior art, the present invention selectively combines these signals falling outside the cyclic prefix window, ie, when its intensity is reached, it can function To the extent that the data signals belonging to the corresponding neighboring cell group are descrambled by using a dedicated scrambling code corresponding to each neighboring cell group, and the process of combining the descrambled data signals of all the cell groups is called a symbol. merge.
  • FIG. 9 is a schematic diagram of a wireless network divided into a plurality of multicast cell groups according to an embodiment of the present invention.
  • the divided cell group of the cell group is based on the radio wave propagation delay and a cyclic prefix window.
  • the radius of the cell group is equal to the distance that the wave propagates in a cyclic prefix window.
  • a path corresponding to a simple radio wave propagation delay corresponding to the length of the cyclic prefix window can be calculated as
  • the range of MBMS cell groups can be set to 3 ⁇ 4km.
  • the distance between the two vertices farthest apart is 4km.
  • the data sent by all the base stations (including the base station 2) in a cell group arrive at a user equipment (for example, the user equipment 1) in the range of the cell group.
  • the network planning including the adjacent seven evolved base stations can be divided into one MBMS cell group for the network planning with the base station distance of 1.732km;
  • a range including at least 19 adjacent evolved base stations is divided into one MBMS cell group.
  • the range of the adjacent 19 evolved base stations can be divided into one MBMS cell group; and for a network plan with a distance of 500m between base stations, at least the adjacent 37 will be included.
  • the range of the evolved base stations is divided into one MBMS cell group.
  • a typical MBMS cell group partition configuration is shown in Table 1.
  • FIG. 10 is a flowchart of a method for merging received multi-path multicast signals from a plurality of base stations in a user equipment of a wireless network divided into a plurality of multicast cell groups according to an embodiment of the present invention.
  • the method will now be described with reference to Figure 10 in conjunction with Figure 9, starting at step S101:
  • step S101 the user equipment 1 separates the recovered multi-path multicast signal into a pilot signal and a data signal.
  • the restoration process includes: analog/digital conversion-FFT (Fast Fourier Transform)-subframe collection, and the like.
  • the recovered multi-channel multicast signal is separated into a pilot signal and a data signal, and then proceeds to step S102;
  • step S102 the user equipment 1 uses the pre-stored multiple scrambling codes (the corresponding scrambling codes of the corresponding cell group A and its respective neighboring cell groups) to perform correlation processing on the pilot signals, respectively, to generate multiple passes. Correlation processed signal, proceeds to step S103;
  • the signal strength of the pilot signal from the cell group A is generally greater than the pilot signal from the neighboring cell group; further, due to the various bases in the cell A
  • the station Before transmitting the pilot signal, the station performs descrambling and correlation processing using the same scrambling code (the dedicated scrambling code of the cell A), and the content and waveform of the pilot signals from the base stations in the cell group A are completely identical, and thus, With the presence of RF combining, the signals are spatially superimposed and the strength is increased. Therefore, the signal strength of the pilot signals (groups) from the base stations in the cell group A is significantly stronger than the pilot signals sent from the neighboring cells. Then, the user equipment obtains a first signal with the highest intensity by comparing the strengths of the respective pilot signals.
  • the first signal is the above-mentioned pilot signal (group) from the base station in the cell group A.
  • the corresponding scrambling code is used as the dedicated scrambling code of the belonging cell group, and is used in the subsequent descrambling step, and proceeds to step S104;
  • step S104 the data signal (including the multiplexed data signals separated from the signals from the base stations of the cell group A and the neighboring cell group) is used by the dedicated scrambling code of the cell group A determined in step S103.
  • the dedicated scrambling codes used by the respective cell groups are different, it is easy to understand that since the scrambling code used for descrambling is a dedicated scrambling code corresponding to the cell group A, the data signal from the neighboring cell group passes the dedicated scrambling code. After participating in the descrambling process, all are randomized into white noise, which is filtered by the filter. The remaining signals are the sum of the data signals from the base stations in the cell group A, that is, the associated combined signals of the home cell group. Thereafter, proceeding to step S105;
  • step S105 each dedicated scrambling code corresponding to each adjacent cell group is determined by the pilot signal, for subsequent operations, and proceeds to step S106;
  • step S106 the data signals (including data separated from signals from cell group A and each neighboring cell group) are used with their respective dedicated scrambling codes determined for each neighboring cell group in step S105.
  • the signal is subjected to descrambling processing, and the number of times of the descrambling process corresponds to the number of neighboring cell groups, and each descrambling process uses the dedicated scrambling code of one of the neighboring cell groups to descramble the data signal, and the foregoing description
  • signals from base stations in a cell group corresponding to dedicated scrambling codes participating in descrambling are successfully descrambled, while signals transmitted by base stations in other cell groups (including cell group A) are randomized. For white noise, it is filtered out.
  • the associated merged signal of the neighboring cell group is generated, and then proceeds to step S107;
  • step S107 the related combined signal of the home cell group and the related combined signal of the neighboring cell group are added to generate a symbol combining signal.
  • 11 is a block diagram of a user equipment for combining received received multi-path multicast signals from a plurality of base stations in a wireless network divided into a plurality of multicast cell groups, in accordance with an embodiment of the present invention. The method will be described with reference to Fig. 11 and in conjunction with Fig. 9, the user equipment 1 comprising a correlation combining device 101 and a symbol combining device 102, wherein the correlation combining device 101 comprises a separating device 1011 and a first determining device.
  • the first determining device 1012 further comprising a correlation device 10121 and a comparison device 10122, the symbol combining device comprising a second determining device 1021 and a second descrambling device 1022, and An adding device 1023.
  • the separating device 1011 separates the recovered multi-channel multicast signal into a pilot signal and a data signal, and for the sake of brevity, the corresponding device for recovering the signal is not shown in the figure.
  • the restoration process includes: analog/digital conversion-FFT (Fast Fourier Transform)-subframe collection, and the like.
  • the recovered multi-channel multicast signal is separated into a pilot signal and a data signal, and then transmitted to the related device 10121 by the separating device 1011;
  • the correlation device 10121 separately processes the pilot signals in the separated signals by using a plurality of scrambling codes pre-stored by the user equipment 1 (the corresponding scrambling codes of the corresponding cell group A and its respective neighboring cell groups), respectively generating a plurality of correlated processed signals, the generated signals are transmitted to the comparing means 10122;
  • the signal strength of the pilot signal from the cell group A is generally larger than the pilot signal from the neighboring cell group; further, since each base station in the cell A transmits the pilot signal, the same scrambling code is used (the cell A is dedicated) The scrambling code) is scrambled, and the content and waveform of the pilot signals from the respective base stations in the cell group A are completely identical. Therefore, there is the existence of RF combining, the signals are spatially superimposed, and the strength is increased. Therefore, from the cell group A The signal strength of the pilot signal (group) of the base station within is significantly stronger than the pilot signal sent by the neighboring cell. Then, the comparing means 10122 can obtain a first signal having the highest intensity by comparing the intensities of the respective pilot signals.
  • the first signal is the above-mentioned pilot signal from the base station in the cell group A (group) ), the corresponding scrambling code is used as a dedicated scrambling code of the belonging cell group, and used for subsequent descrambling;
  • the first descrambling device 1013 uses the dedicated scrambling code of the cell group A determined by the comparing device 10122 to multiplex the data signals (including signals separated from the base stations of the cell group A and the neighboring cell group).
  • the data signal is subjected to descrambling processing.
  • the dedicated scrambling codes used by the respective cell groups are different, it is easy to understand that since the scrambling code used for descrambling is a dedicated scrambling code corresponding to the cell group A, the data signal from the neighboring cell group passes the dedicated scrambling code. After participating in the descrambling process, all are randomized into white noise, which is filtered by the filter, and the remaining signals are the sum of the data signals from the base stations in the cell group A, that is, the related combined signals of the home cell group;
  • the second determining means 1021 determines each dedicated scrambling code corresponding to each adjacent cell group by each pilot signal separated by the separating means 1011, and hands it to a second solution 422;
  • the second descrambling device 1022 separates the data signals (including signals from the cell group A and each of the neighboring cell groups) by their respective dedicated scrambling codes determined by the second determining device 1021 for each of the neighboring cell groups.
  • the outgoing data signal is subjected to descrambling processing, and the number of times of the descrambling process corresponds to the number of neighboring cell groups, and each descrambling process uses the dedicated scrambling code of one of the neighboring cell groups to descramble the data signal, and
  • the foregoing description is similarly, after descrambling, the signal from the base station in the cell group corresponding to the dedicated scrambling code participating in descrambling is successfully descrambled, and the signals transmitted by the base station in other cell groups (including cell group A) are It is randomized to white noise and is filtered out. After the corresponding descrambling, the associated merged signals of the adjacent cell groups are generated, and then the associated merged signals of the respective cell groups are successively transmitted to the adding device 10
  • the adding unit of the home cell group (cell group A) is added by the adding means 1023 to the associated combined signal of the neighboring cell group to generate a symbol combining signal.
  • non-correlated symbol combining can achieve additional macro diversity gain, however, it introduces additional reception complexity for user equipment receivers.
  • FIG. 12 is a schematic diagram of a method for alternately allocating time domain resources for unicast traffic and multicast traffic according to an embodiment of the present invention.
  • the corresponding unicast interference signal arriving at the user equipment receiver is uncorrelated. In this way, inter-cell interference caused by unicast services of other cell groups can be greatly reduced, even if there is no non-correlated symbol merging.
  • the signal to noise ratio can also be met.
  • Interleaving TDM resources for multicast services and unicast services can be achieved through layer 2 scheduling.
  • This layer 2 scheduling policy is fixed by the aGW (access gateway). For example, a predefined TDM map is distributed from the aGW to each evolved base station. The multicast service is initially at the beginning of each cell group. It has been staggered.
  • the time difference between the two wireless links does not need to be very strict, such as 16.7 ⁇ 8 or less.
  • This synchronization requirement is only related to the capabilities of the user equipment, so the synchronization of the physical layer does not need to be considered between evolved base stations between cell groups.
  • FIG. 13 is a flow diagram of a method for merging multicast signals employing OFDM signals in accordance with an embodiment of the present invention. The method will now be described with reference to Figure 13 in conjunction with Figure 9.
  • a signal including a base station from a cell group A and each neighboring cell group is subjected to analog/digital conversion to generate an analog/digital converted signal;
  • the separated pilot codes are used to obtain a dedicated ⁇ code of each cell group;
  • the present invention is not limited to the MBMS system of 3GPP LTE, but can be applied to all broadcast multicast systems using OFDM as the downlink transmission technology.

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Description

演进的多媒体广播和组播业务数据的发送接收方法及设备 技术领域
本发明涉及基于正交频分复用多址 （OFDMA ) 的第三代合作伙 伴项目 （3GPP )长期演进（LTE )的移动通信领域， 尤其涉及在演进 的通用移动电信系统（UMTS )无线接入网 （E-UTRAN ) 中对演进的 多媒体广播和组播业务（E-MBMS )数据的发送接收方法和设备。 背景技术
第三代合作伙伴项目 （3GPP ) 的长期演进（LTE ) 项目是近两年 来 3GPP启动的最大的新技术研发项目。 由于在 3GPP LTE中， 下行 技术采用了完全不同的物理层传输技术， 即正交频分复用 （OFDM ) 的传输方式， 因此， 该环境下的 E-MBMS与 WCDMA (宽带码分多 址） Release6协议中的 MBMS相比，具有了很多不同的全新的特征。
在 3GPP LTE中， 下行传输方案是釆用传统的带循环前缀（CP ) 的正交频分复用 （OFDM ), 每一个子载波占用 15kHz。 循环前缀的持 续时间为 4.7/16.7 s， 分别对应短 CP和长 CP。 长 CP是为了应用于 多小区传输的多媒体广播 /组播业务和某些基站间距较大的宏小区环 境。
MBMS业务的传输可以通过两种方式下发， 一是多小区传输， 二 是单小区传输。 当 MBMS 业务在多小区传输的情况下， 小区和数据 内容都是同步的， 这样用户终端 （UE ) 可以合并多个无线链路上的 能量而不需要增加接收机的复杂性。 上述这种合并是相关合并， 也被 称为射频 （RF )合并。 RF合并要求所有到达 UE接收机的信号都处 于 CP定义的窗之内， 因此需要小区间达到严格的同步。 此外， 考虑 到参考（导频）信号的合并， 在参考信号被设计为小区公共导频信号 的情况下， 由于所有小区的 MBMS参考信号是一样的， 因此可以做 信号的 RF合并。
但是， 在小区之间非同步的情况， 或者是在多径时延扩展比较大 的糟糕城市信道（BU )的环境下， 到达 UE接收机的信号有可能落于 CP 窗之外， 这些信号会导致符号间的干扰。 而且， 由于广播业务在 导频和数据内容上都一模一样， 因此信号是强相关的， 如果这个信号 落于 CP窗之外， 则所形成的小区间干扰会影响导频估计以及数据接 收， 所以必须对此引起重视。
3GPP LTE的标准中提出：
下行参考信号可以被用于
-下行信道质量测量
-用于 UE相关解调和检测的下行信道估计
-小区搜索和初始捕获
在 3GPP LTE中初步讨论的基本参考信号结构的设计如图 1所示。 从图 1中可以看出， 参考符号， 又称为第一参考符号， 位于分配给下 行数据传输的子载波的第一个 OFDM符号位置。 附加参考符号， 又 称为第二参考符号， 位于分配给下行数据传输的子载波的倒数第三个
OFDM符号位置。 在具体的实现中， 比如 MBMS的传输中， 参考符 号和附加参考符号可以是不同的符号， 并且有不同的重复频率。
基于上述结构，已知有几种 3GPP LTE中 MBMS的数据发送方法。 这些方法首先对 MBMS数据进行信道编码和调制， 之后， 选择所需 扰码。 所选择的扰码可以是所有小区彼此相同的一个小区公共扰码， 也可以是各个小区彼此不同的小区专用扰码。 在所选择的基础上， 利 用所选扰码对导频和 /或数据进行加扰后发送。经此加扰后的导频和数 据结构分别如图 2A、 2B和 2C所示。
上述三幅图分别示出选择不同扰码进行加扰后得到的数据结构， 其中， 横坐标表示时间域， 纵坐标表示频率域， 每个矩形格表示一个 符号。 图 2A示出选择小区公共扰码对导频进行加扰后得到的导频和 数据结构。 图 2B示出选择小区公共扰码和小区专用扰码分别对导频 进行加扰后得到的导频和数据结构。 图 2C示出选择小区专用扰码对 导频进行加扰以及选择业务扰码对 MBMS 中不同业务的数据进行加 扰后得到的导频和数据结构。 虽然上述已有的数振发送方法能够对导频和数据进行加扰， 但是 它们是以假定所有的演进节点 B ( E-NodeB )都能严格同步作为前提 的。 在此情况下， 周围小区的信道到达 UE接收机时都能落在 CP窗 之内， 即便是有泄漏在 CP窗之外的， 也会认为其功率对接收机干扰 的影响可以忽略。
但是， 在小区之间非同步的情况， 或者在多径时延扩展比较大的 糟糕城市信道环境下， 此时到达 UE接收机的信号有可能落于 CP窗 之外。 而且， 由于广播业务在导频和数据内容上都一模一样， 因此信 号是强相关的， 则所形成的小区间干扰会影响导频估计以及数据接 收。
为解决小区之间的不同步，到达 UE接收机的信号有可能落于 CP 窗之外， 从而产生干扰的问题， 本申请人基于在演进 UTRAN 中 E-NodeB的同步、 下行宏分集和 UE接收合并的考虑， 提出将多个小 区划分为小区组以解决上述问题。 其中， 具体提出了一种 E-UTRAN 中划分 MBMS 小区组的方案。 该方案依据电波传播时延将所有小区 划分为若干个 MBMS小区组。 每一个小区组包含若干个 E-NodeB和 属于这些 E-NodeB的小区 /扇区。 一个小区组覆盖的区域其直径等于 或略小于一个长 CP窗时间电波传播的距离， 即当 UE位于一个小区 组之内时， 所有从这个小区组的 E-NodeB上发出的信号， 在到达 UE 时都处在 CP窗之内。 对于该 MBMS小区组划分方案的详细说明， 参 见本申请人同一天向中国知识产权局递交的题为" ，，的专利申请（申 请号： ）。
为了在上述 MBMS小区组划分的基础上， 对 MBMS进行传输， 需要一种适合于该 MBMS 小区组划分方案的数据发送和接收方法及 相应的设备和系统。
E-MBMS作为 MBMS (多媒体广播和组播业务）在第三代移动通 信系统中的演进， 采用了与后者完全不同的物理层传输技术， 即 OFDM (正交频分复用）传输方式。 正是由于物理层的传输技术不同， 使得 E-MBMS与 WCDMA Release6协议中定义的 MBMS相比，具有 了很多全新的特征。
在 3GPP LTE (长期演进的第三代移动通信） 中， 下行信号主要 采用传统的带循环前缀（CP )的 OFDM信号。每一个子载波占用 15kHz 带宽， 循环前缀的持续时间为 4.7或 16.7 s, 分别对应短循环前缀和 长循环前缀。 其中， 长循环前缀主要应用于多小区传输的多媒体广播 /组播业务和某些基站间距较大的宏小区环境。在大多数的情况下，通 过时间复用来传输多播业务和单播业务， 或者将两者分别在不同的载 波上传输， 这时， 多播业务采用单独的长循环前缀； 在那些通过频域 复用来传输多播业务和单播业务的情况下， 也要用长的循环前缀来优 先满足多播业务的需要。
在同步的 E-UTRAN ( UMTS无线接入网） 系统中， 由于信号到 达用户设备（用户设备）的接收机的时刻都处于循环前缀定义的窗之 内， 这些所谓的小区间的干扰不会产生很大的问题， 因为循环前缀窗 之内的信号的时域扩展不会引起 OFDM符号的符号间干扰（ISI ) , 这种时延扩展的信号在做快速傅立叶变换后可以在频域进行合并。但 是， 在其它一些情况下， 来自周围小区的干扰超出了循环前缀窗的范 围， 由于广播业务在内容上完全相同， 其信号间强相关， 循环前缀窗 外的信号会引起严重的 ISI, 存在这种问题的网络可能：
-环境包括：
小区间异步；
-多径时延较大 （如， BU: 糟糕城市环境） 。
在通过物理层同步技术同步的异步系统中， 基站的时间参考是相 互独立的， 小区之间有一定的时间漂移。 在 3GPP UMTS系统的设计 中， 不同小区的信道的帧结构之间存在緩慢的滑动， 一个绝对的设计 精度要求是： 小区间时间参考的漂移须小于 ±0.05 ppm。
基于这样的精度要求， E-UTRAN 系统中两个小区的相对时间漂 移每 3分钟就会达到一个长循环前缀定义的窗的大小 （16.7 s ) 。 这 样， 理论上每 3分钟就要在 MBMS服务区的所有演进型的基站间做 一次同步，这将会非常复杂和低效，而重同步的过程也会非常的频繁。 当所有的演进型基站是同步的， 即系统为同步系统， 如果无线传 播的环境是在 BU下且小区基站间距为 1.732km时， 从不同小区基站 发出的同一内容的信号， 其到达用户设备的时刻不一定落在循环前缀 定义的窗之内。 其中， BU是 3GPP LTE采纳的 COST 207模型中一 种典型的城市信道环境， 基站间距 1.732km是 3GPP LTE采用的一种 糟糕的宏小区配置方式。 根据 COST 207的模型， 在 BU环境下， 信 号的第 5径延迟主径 5μδ到达， 并且其平均功率只比主径低 2dB, 信 号的第 6径延迟主径 6.6 s到达， 而其平均功率只比主径低 4dB。 因 此， 即便是在同步系统下， 也可能有从其它基站来的可观的功率泄漏 到循环前缀窗之外而形成 ISI。
然而， 现有的技术都假定所有的演进型基站都是严格同步的（实 际并非如此） ， 在一个很大范围内的任一基站发来的信号到达用户设 备处时都能落在循环前缀窗之内， 即使落在循环前缀窗之外， 也认为 其功率对接收机的影响可以忽略不计。 很明显， 这种方案由于假设场 景并不真正满足， 落在循环前缀窗之外的信号会对影响接收机的导频 估计以及数据接收。
因此， 需要一种能够避免落于循环前缀窗外的信号引起 ISI的方 法和相应装置。 发明内容
本发明的一个目的就是提供一种基于划分了上述 MBMS 小区组 的对多媒体广播和组播业务的数据发送方法， 包括如下步骤： 对多媒 体广播和组播业务数据进行信道编码和数据调制； 确定多媒体广播和 組播业务小区组的专用扰码； 确定多媒体广播和組播业务小区专用扰 码； 针对经信道编码和数据调制后的多媒体广播和组播业务数据， 利 用小区组专用扰码对多媒体广播和组播业务数据进行加扰， 并加入经 小区组专用扰码加扰的参考信号以及经小区专用扰码加扰的参考信 号； 以及发送加扰后的多媒体广播和组播业务参考信号和数据。
根据本发明的一个方面， 提供了一种基于划分了小区组的多媒体 广播和組播业务数据的接收方法， 包括如下步骤： 接收加扰后的多媒 体广播和組播业务参考信号和数据； 确定用于解扰的多媒体广播和组 播业务小区组专用扰码； 确定用于解扰的多媒体广播和组播业务小区 专用扰码； 利用确定的扰码， 对接收的多媒体广播和组播业务的参考 信号和数据进行解扰；以及对解扰后的多媒体广播和组播业务的参考信 号和数据进行信道解码和数据解调。
为实现上述方法， 本发明还提供了相应的设备。 其中， 根据本发 明的一个方面， 提供了一种用于划分了小区组的环境的多媒体广播和 组播业务数据的发送设备， 包括： 信道编码和数据调制装置， 用于对 多媒体广播和组播业务数据进行信道编码和数据调制； 小区组专用扰 码确定装置， 用于确定多媒体广播和組播业务小区组专用扰码； 小区专 用扰码确定装置， 用于确定多媒体广播和组播业务小区专用扰码； 加扰 装置， 用于针对经信道编码和数据调制后的多媒体广播和组播业务数 据， 利用小区组专用扰码对多媒体广播和组播业务数据进行加扰， 并加 入经小区组专用扰码加扰的参考信号以及经小区专用扰码加扰的参考 信号； 以及加扰数据发送装置， 用于发送加扰后的多媒体广播和組播业 务参考信号和数据。
根据本发明的一个方面， 提供了一种用于划分了小区组的环境的 多媒体广播和组播业务数据的接收设备， 包括： 加扰信号接收装置， 用于接收加扰后的多媒体广播和组播业务参考信号和数据； 小区组解扰 码确定装置， 用于确定用于解扰的多媒体广播和组播业务小区组专用扰 码； 小区解扰码确定装置， 用于确定用于解扰的多媒体广播和组播业务 小区专用扰码； 解扰装置， 用于利用确定的小区组专用扰码和小区专用 扰码， 对接收的多媒体广播和组播业务的参考信号和数据进行解扰； 以 及信道解码和数据解调装置， 用于对解扰后的多媒体广播和组播业务的 参考信号和数据进行信道解码和数据解调。
此外， 本发明还提供了包括上述发送设备的节点 B、 包括上述接 收设备的用户终端以及包括这种节点 B和用户终端的系统。
根据本发明的一个方面， 提供了一种在划分为多个小区组的无线 网络的用户设备中用于对所接收的来自多个网络节点的多路多播信 号进行合并处理的方法， 所述多个网络节点分属不同的小区组， 其特 征在于， 该方法包括以下步驟： 对所接收的所述多路多播信号的空间 合并信号中具有该用户设备所属小区组专用扰码的多播信号进行相 关合并， 以生成归属小区组的相关合并信号； 对于所述空间合并信号 中具有不同扰码的多播信号进行非相关符号合并， 以生成符号合并信 号。
根据本发明的一个方面， 提供了一种在无线网络中用于对所接收 的来自多个网络节点的多路多播信号进行合并处理的用户设备， 包 括： 一个相关合并装置， 用于对所述多路多播信号的空间合并信号中 具有相同扰码的多播信号进行相关合并， 以生成相关合并信号； 一个 符号合并装置， 用于对于所述空间合并信号中具有不同扰码的多播信 号进行非相关符号合并， 以生成符号合并信号。
根据本发明的一个方面， 提供了一种在划分为多个小区组的无线 网络中用于传输多播信号的方法， 其中， 每个小区组包括多个网络节 点及其所辖小区， 其特征在于， 每个小区组的网络节点利用同一专用 扰码对将要发送信号进行加扰。
根据本发明的一个方面，提供了一种在划分为多个小区组的用于 传输多播信号的无线网络， 其中， 每个小区组包括多个网络节点及其 所辖小区， 其特征在于， 每个小区组的网络节点利用同一专用扰码对 将要发送信号进行加扰。
根据本发明的一个方面，提供了一种在划分为多个小区组的无线 网络的接入设备中用于为多播业务调度时间域资源的方法， 其特征在 于， 在对分发给所辖小区组的单播业务和多播业务进行时分复用时交 错地分配时间域资源， 以确保同一时间最多仅有一个小区组传输多播 业务。 ，
根据本发明的一个方面，提供了一种在划分为多个小区组的无线 网络中用于为多播业务调度时间域资源的接入设备， 其特征在于， 在 对分发给所辖小区组的单播业务和多播业务进行时分复用时交错地 分配时间域资源， 以确保同一时间最多仅有一个小区组传输多播业 务。
利用本发明， 在用户设备接收端， 小区组内的 E-NodeB发出的信号 可以做 RF的合并（相关软合并）， 而不同小区组间的 E-NodeB发出的 信号可以在 FFT之后做符号级的软合并（非相关软合并）。 并且对同步 的要求也变得相对宽松。 附图说明
结合附图以及后面的详细说明， 本发明的前述以及其他特点和优 点将变得更加明显， 在附图中：
图 1示出 3GPP LTE中初步讨论的基本参考信号结构的设计； 图 2A示出选择小区公共扰码对导频进行加扰后得到的导频数据结 构；
图 2B 示出选择小区公共扰码和小区专用扰码分别对导频进行加扰 后得到的导频数据结构；
图 2C 示出选择小区专用扰码对导频和数据进行加扰后得到的导频 数据结构；
图 3示出本申请人提出的 LTE中 MBMS小区组划分的示意图； 图 4示出根据本发明实施方式的 MBMS数据的发送方法的流程图； 数据结构的示意图；
图 6示出根据本发明实施方式的 MBMS数据的接收方法的流程图； 图 7示出根据本发明实施方式的数据发送设备的内部结构示意图； 以及
图 8示出根据本发明实施方式的数据接收设备的内部结构示意图； 图 9为根据本发明的一个具体实施方式的划分为多个多播小区組 的无线网络示意图；
图 10为根据本发明的一个具体实施方式的在划分为多个多播小 区组的无线网络的用户设备中用于对所接收的来自多个基站的多路 多播信号进行合并处理的方法流程图；
图 11 为根据本发明的一个具体实施方式的在划分为多个多播小 区组的无线网络中用于对所接收的来自多个网络节点的多路多播信 号进行合并处理的用户设备框图；
图 12为根据本发明的一个具体实施方式的为单播业务和组播业 务交错地分配时间域资源的方法示意图；
图 13为根据本发明的一个具体实施方式的用于对采用 OFDM信 号的多播信号进行合并处理的方法流程图。 具体实施方式
下面结合附图对本发明的具体实施方式进行详细说明。 应当注 意， 这里所示出的方法的具体实现步骤以及设备的具体结构仅为示例 性的， 而不应当理解为是对本发明的限制。
为了便于说明， 图 3中示出了本申请人提出的如前所述的 LTE中 MBMS 小区组的划分。 虽然这里所示的例子是以六边形小区为模型 的， 但作为本发明基础的 MBMS小区组的划分并不限于此。
从图 3中可以看出， 在 LTE的小区配置中， 依据电波传播时延将 所有小区划分为若干个 MBMS 小区组。 每一个小区组包含若干个属 于该小区组的 E-NodeB (位置处于该小区组中， 以小三角形表示）和 属于这些 E-NodeB的小区 /扇区。 一个小区组覆盖的区域其直径等于 或略小于一个长 CP窗时间电波传播的距离， 例如 4km, 从而使得当 UE位于一个小区组之内时， 所有从这个小区组的 E-NodeB上发出的 信号， 在到达 UE时都处在 CP窗之内。 为了能在 UE接收机内不需 要增加任何操作就做 RF合并， 在 CP窗之内的信号内容和波形必须 一模一样。 为此， 本申请提出利用一个小区组专用扰码对 MBMS 业 务数据进行加扰的方案， 该小区组专用扰码对小区组之内的所有 E-NodeB是公共的， 而对不同小区组来说是不相同的。
下面，结合图 4详细说明根据本发明实施方式的 MBMS数据的发 送方法， 其中具体解释了如何利用小区组专用扰码对 MBMS数据进 行加 ύ。 在经上述 MBMS小区组划分的演进的 UMTS的 E-UTRAN 中， 由 E-NodeB将 MBMS数据发送给处于小区组中的 UE。
图 4的流程开始， 在步骤 402中， 接收 MBMS数据。 在演进的 UMTS的 E-UTRAN中， MBMS数据通常来自于作为核心网边界节点 的接入网关 （ AGW )。 针对该 MBMS数据， E-NodeB在步骤 404中 对其进行信道编码和数据调制。 在该步驟中， 可以使用现有技术中的 任意一种信道编码方法和数据调制方式， 而不会对本发明构成限制。
之后， 在图 4 所示流程的步骤 406 中， 由发送 MBMS 数据的 E-NodeB确定自身所属小区组的专用扰码以及 MBMS小区专用扰码。 小区组的专用扰码以及 MBMS 小区专用扰码可以在系统配置时设置 在各个 E-NodeB中。在本发明的实施方式中，对于图 3中所示的每个 小区组， 都有不同于其他小区组的专用扰码。 每一个处于确定的小区 组中的 E-NodeB都能够知晓其所属的小区组专用扰码。
可以采用现有的常规扰码序列中的任意一种伪随机序列作为小 区组专用扰码， 例如 Gold序列或者 Kasami序列等等。
在确定了所属小区组专用扰码及 MBMS小区专用扰码后，在步骤 408中， E-NodeB将利用所确定的小区組专用扰码及 MBMS小区专用 扰码对经信道编码和数据调制后的 MBMS导频和 /或数据进行加扰处 理。 具体地， 针对经信道编码和数据调制后的 MBMS数据， 利用小 区组专用扰码对 MBMS数据进行加扰， 并加入经小区组专用扰码加 扰的参考信号以及经小区专用扰码加扰的参考信号。 并且在加扰处理 时， 使得加扰后的导频相互间隔， 并在综合考虑到数据传输的有效性 以及对信道响应估计影响的情况下，使加扰的导频相隔与相关带宽和 相关时间相比拟。
之后，在步骤 410发送经加扰后的 MBMS数据。 图 4所示流程结 束。
从图 4的示意性流程可以看出， 与现有技术中仅对导频和数据使 用小区专用扰码进行加扰不同， 利用本发明实施方式的数据发送方法 处理后的 MBMS数据中还加入了经小区组专用扰码加扰的导频和数 据， 其结构示意图如图 5所示。 其中， 示例性地， 横坐标表示时间域， 纵坐标表示频率域， 每个矩形格表示一个符号。 沿横轴方向以六个符 号表示一个子帧， 每个子帧的时间为 0.5ms。 沿纵轴方向排列的每横 行对应一个子载波。
可以看出，图 5所示信道结构包含了 MBMS小区组专用扰码加扰 的导频和附加的小区专用扰码加扰的导频。 在这个结构中， 小区专用 扰码加扰的导频用于下行信道测量、 小区搜索和初始捕获。 MBMS 小区组专用扰码加扰的导频可以用于 UE相关解调和检测的下行信道 估计， 以及下行链路分支功率水平的测量和在小区组之间的切换。
对应于前述图 1示出的 3GPP LTE中的基本参考信号结构， 根据 本发明的 MBMS数据发送方法利用小区组专用扰码对第一参考符号 (导频）进行加扰， 在图 5中对应于相互间隔的小区组专用扰码加扰 的导频； 还利用小区专用扰码对第二参考符号 （导频）进行加扰， 在 图 5中对应于相互间隔的小区专用扰码加扰导频。 对于 MBMS数据， 则利用小区组专用扰码进行加扰， 在图 5中表示为除加扰导频以外的 矩形。
在一个小区组内， 参考信号和数据都是利用一个小区组专用扰码 进行加扰的， 这样从组内的 E-NodeB 发出的导频和数据的信号到达 UE接收机时都处于 CP窗之内， 并且信号波形都一致。 因此在 UE端 不经过任何操作就可以实现 RF合并，从而很方便地获得了分集增益。
而在小区组的边界， 由于不同小区组使用了不同的小区组专用扰 码， 因此 UE在接收到来自其他小区组， 即利用其他小区组的专用扰 码加扰的数据后， 可以利用对扰码的识别将从其他小区组来的信号随 机化， 使得 UE将来自其他小区组的信号视为随机白噪声予以去除。 并且， 由于每个 UE都能够知晓周围的小区组专用扰码， 当 UE移动 到小区组的边界时， UE通过测量会发现一个干扰信号的导频信号已 经强到一定程度而可以作为有用的合并分支， 为此就会在 UE接收机 中建立一个额外的物理层处理分支来接收这一信号，从而在 FFT之后 将两路信号的符号做软合并， 以获得宏分集增益。 更进一步， 既然采用了在 FFT之后的非相关软合并， 两个无线链 路的时间差就不需要非常严格， 如可以大于 16.7μ8或者更大。 这样， 严格的同步和重同步过程只需要在小区组之内的 E-NodeB之间实施， 而这种物理层的同步不需要在不同小区组的 E-NodeB之间考虑。从而 E-MBMS的同步和重同步过程就会是非常筒单和高效。
通过上述描述， 本领域的技术人员应当理解， 本发明并不限于上 述小区组划分方法， 而是可以适用于任何将多个小区划分为不同小区 组的环境。 对小区组的不同划分不构成对本发明的限制。
与上述根据本发明实施方式的 MBMS数据发送方法相对应，本发 明还提供了一种 E-MBMS数据的接收方法， 其流程示意图如图 6所 示。 在经上述 MBMS小区组划分的演进的 UMTS的 E-UTRAN中， 由 UE接收经加扰的 E-MBMS数据。
图 6所示流程开始， 在步骤 602中， 接收经小区组专用扰码进行 了加扰的 MBMS数据。 当 UE位于一个 MBMS小区组的内部时， 从 其所属的这个小区组的所有 E-NodeB发出的信号到达该 UE时都处于 CP窗之内。 而当 UE位于小区组的边缘时， UE 将接收到两个或两个 以上足够强的经加扰的 MBMS数据，分别来自当前 UE所处位置所属 的小区组以及与当前 UE所处位置最邻近的一个或多个小区组。
之后， 在步骤 604中， 确定解扰码。 在本发明的实施方式中， 解 扰码是小区组专用扰码和小区专用扰码。 对于图 3中所示的每个小区 组， 都有不同于其他小区组的专用扰码。 每一个处于确定的小区组内 的 UE都能够知晓其所属小区组的专用扰码。 这通过将接收多媒体广 播和组播业务数据的 UE所存储的小区组扰码序列与接收的加扰后的 MBMS 参考信号和数据中的经小区組专用扰码加扰的参考信号和数 据进行相关计算， 确定该小区组的专用扰码。 当 UE位于小区组的边 缘时， 其知晓当前自身所处位置所属的小区组的专用扰码（称为第一 小区组专用扰码） 以及与当前 UE所处位置最邻近的小区组的专用扰 码 （称为第二小区组专用扰码）。
利用所确定的解扰码， 在步骤 606中针对步骤 602接收的经加扰 的 MBMS数据进行解扰。 具体地， 就是利用小区组专用扰码， 对经 小区組专用扰码加扰的导频和数据进行解扰， 以及利用小区专用扰 码， 对经小区专用扰码加扰的导频进行解扰。 对于小区組中的 UE， 可以容易地利用其所知晓的所属小区组的专用扰码完成该解扰。 当 UE位于小区組的边缘时， 其将利用所确定的第一小区组专用扰码对 接收信号进行解扰并存储来自自身所处小区组的数据， 而利用所确定 的第二小区组专用扰码对接收信号进行解扰并存储来自最邻近的小 区组的数据。 并可以在 UE接收机中将上述两个解扰后的信号在 FFT 之后做符号级的软合并 （非相关软合并）。
经解扰处理后的 MBMS数据在步骤 608中进行信道解码和数据解 调， 从而在步骤 610获得 MBMS数据。 到此， 图 6所示数据接收方 法的流程结束。
利用上述根据本发明的 MBMS数据接收方法，无论 UE处于小区 组内还是小区组边缘都可以实现良好的 R 合并或者软合并， 从而获 得分集增益。
为了实现上述根据本发明实施方式的数据发送和接收方法， 本发 明还提供了相应的设备， 它们应用于与前述类似的划分了小区组的环 境。 图 7示出根据本发明实施方式的数据发送设备 700的内部结构示 意图。 从图 7可以看出， 才艮据本发明实施方式的数据发送设备 700包 括数据接收装置 702、 信道编码和数据调制装置 704、 扰码确定装置 706、 加扰装置 708 以及加扰信号发送装置 710。 其中扰码确定装置 706包括小区组扰码确定装置 7061和小区扰码确定装置 7062。
下面结合图 7详细说明根据本发明实施方式的数据发送设备 700 内部各个装置之间的相互连接和操作关系。 数据接收装置 702通常从 作为核心网边界节点的接入网关 （AGW ) 处接收 MBMS数据。 针对 该 MBMS数据， 由信道编码和数据调制装置 704进行信道编码和数 据调制。信道编码和数据调制装置 704可以使用现有技术中的任意一 种信道编码方法和数据调制方式， 而不会对本发明构成限制。
之后， 由小区组扰码确定装置 7061 确定发送 MBMS 数据的 E-NodeB 自身所属小区组的专用扰码及由小区扰码确定装置 7062确 定小区专用扰码。 小区组的专用扰码以及 MBMS 小区专用扰码可以 在系统配置时设置在各个 E-NodeB中。在本发明的实施方式中，对于 图 3中所示的每个小区組， 都有不同于其他小区组专用扰码。 每一个 处于确定的小区组中的 E-NodeB 都能够知晓其所属的小区组专用扰 码。
可以采用现有的常规扰码序列中的任意一种伪随机序列作为小 区组专用扰码， 例如 Gold序列或者 Kasami序列等等。
在确定了扰码后， 由加 4尤装置 708利用所确定的 码 j、区组 专用扰码和小区专用扰码对信道编码和数据调制装置 704 输出的 MBMS数据进行加扰处理。 具体地在该加扰处理中，针对经信道编码 和数据调制后的 MBMS数据， 利用小区组专用扰码对 MBMS数据进 行加扰， 并加入经小区组专用扰码加扰的参考信号以及经小区专用扰 码加扰的参考信号。并且在加扰处理时，使得加扰后的导频相互间隔， 并在综合考虑到数据传输的有效性以及对信道响应估计影响的情况 下， 使加扰的导频相隔与相关带宽和相关时间相比拟。 之后， 由加扰 信号发送装置 710发送经加扰后的 MBMS信号。
相应地， 本发明还提供了一种数据接收设备 800, 其内部结构示 意图如图 8所示。 从图 8可以看出， 根据本发明的数据接收设备 800 包括加扰信号接收装置 802、 解扰码确定装置 804、 解扰装置 806、 信 道解码和数据解调装置 808以及数据获得装置 810。 其中解扰码确定 装置 804 包括小区组解扰码确定装置 8041 和小区解扰码确定装置 8042。
下面结合图 8详细说明根据本发明实施方式的数据接收设备 800 内部各个装置之间的相互连接和操作关系。 首先， 由加扰信号接收装 置 802接收进行了加 ^尤的 MBMS数据。 当 UE位于一个 MBMS小区 组的内部时，从其所属的这个小区組的所有 E-NodeB发出的信号到达 该 UE时都处于 CP窗之内。 而当 UE位于小区组的边缘时， 加扰信 号接收装置 802 将接收到两个足够强的经加扰的 MBMS数据， 分别 来自当前 UE所处位置所属的小区組以及与当前 UE所处位置最邻近 的小区组。
之后， 由小区组解扰码确定装置 8041 确定解扰所需的小区组专 用扰码， 并且由小区解扰码确定装置 8042确定解扰所需的小区专用 扰码。 在本发明的实施方式中， 对于图 3中所示的每个小区组， 都有 不同于其他小区组的专用扰码。 每一个处于确定的小区组内的 UE都 能够知晓其所属小区组的专用扰码。其中， 小区組扰码确定装置 8041 通过将接收多媒体广播和組播业务数据的 UE所存储的小区组扰码序 列与接收的加扰后的 MBMS 参考信号和数据中的经小区组专用扰码 加扰的参考信号和数据进行相关计算， 确定该小区组的专用扰码。 当 UE 位于小区组的边缘时， 其知晓当前自身所处位置所属的小区组的 专用扰码 （称为第一小区组专用扰码） 以及与当前 UE所处位置最邻 近的小区组的专用扰码 （称为第二小区组专用扰码）。
利用所确定的扰码， 由解扰装置 806针对接收的经加扰的 MBMS 数据进行解扰。 具体地， 是利用小区组专用扰码， 对经小区组专用扰 码加扰的参考信号和数据进行解扰, 以及利用小区专用扰码， 对经小 区专用扰码加扰的参考信号进行解扰。 对于小区组中的 UE, 可以容 易地利用其所知晓的所属小区组的专用扰码完成该解扰。 当 UE位于 小区组的边缘时， 其将利用所确定的第一小区组专用扰码对接收信号 进行解扰并存储来自自身所处小区组的数据， 而利用所确定的第二小 区组专用扰码对接收信号进行解扰并存储来自最邻近的小区组的数 据。 并可以在 UE接收机中将上述两个解扰后的信号在 FFT之后做符 号级的软合并 （非相关软合并）。
经解扰处理后的 MBMS数据在信道解码和数据解调装置 808中进 行信道解码和数据解调， 从而由数据获得装置 810获得 MBMS数据。
利用前述根据本发明实施方式的数据发送设备和数据接收设备 构成的系统， 在 MBMS小区组划分的基础上， 获得 MBMS演进中导 频和业务数据的结构。 由于根据本发明实施方式的方案中引入了一个 MBMS小区组专用扰码，使得在使用其加扰后的导频信号结构中包含 了 MBMS 小区组专用扰码加扰的导频和附加的小区专用扰码加扰的 导频。 MBMS 业务数据也可用小区组专用扰码进行加扰。 这样， 在 UE接收端， 小区组内的 E-NodeB发出的信号可以做 RF的合并 （相 关软合并 )， 而不同小区组间的 E-NodeB发出的信号可以在 FFT之后 做符号级的软合并（非相关软合并）。 由于软合并是在 FFT之后 Turbo 解码之前的符号级别上， 因此对同步的要求相对宽松。 严格的物理层 同步和重同步过程只需要在小区组之内的 E-NodeB之间实施。
有以下概念需要说明：
循环前缀窗： 与 OFDM符号的循环前缀对应的一个相应的时间 段， 这个时间段被形象地称为循环前缀窗， 根据来自一个基站的信号 最终到达用户设备的时刻是否处于该时间段内， 称该信号落在循环前 缀窗之内或落在循环前缀窗之外；
小区组： 本发明利用下行 OFDM信号所带循环前缀的长度， 确 切地说是利用循环前缀窗时间内电波传播的距离， 来将无线网络的若 干个小区定义为一个小区組， 该距离通常为小区组的直径或相距最远 的两个顶点间的距离。 其特点是， 在同一个小区组内的所有基站的多 播信号到达处于该小区组覆盖范围内的用户设备的时刻均落在循环 前缀窗之内；
归属小区组： 用户设备当前处于哪个小区组的控制范围内， 哪个 小区组就称为归属小区组；
相邻小区组： 与用户设备当前所在位置对应的小区組相邻， 且其 中基站发送的多播信号在用户设备当前所在位置对应的小区组内达 到一定强度的一个或多个小区组；
RF合并：对于多小区传输的 MBMS业务，如果小区间严格同步， 即所有到达用户设备接收机的信号均落在循环前缀定义的窗之内， 则 用户设备可以合并多个链路上的信号， 而不需要增加接受机的复杂 度， 这种合并称为 RF合并；
专用扰码： 在同一个小区组内， 可能有多个基站， 由于要对来自 这些基站的信号进行 RF合并，要求这些信号（落在循环前缀窗之内） 的内容和波形完全一致， 因此， 这些基站必须使用相同的扰码对信号 进行加扰， 这个 ^尤码称为该小区组的专用 码， 不同的小区組使用不 同的专用扰码；
符号合并： 对于来自相邻小区'组中的基站的信号， 区别于现有技 术，本发明对这些落在循环前缀窗之外的信号进行选择性地合并，即， 当其强度达到可以产生作用的程度时， 利用与每个相邻小区组分别对 应的专用扰码对属于相应相邻小区组的数据信号进行解扰， 将所有小 区组的解扰后的数据信号进行合并的过程称为符号合并。
图 9为根据本发明的一个具体实施方式的划分为多个多播小区组 的无线网络示意图。其中包括多个小区组、每个小区组内有多个基站、 以及一个用户设备 1 , 为筒明起见，仅示出一个小区组 A和其中的一个 基站 2。 其中， 小区组的划分小区组依据电波传播时延和一个循环前 缀窗。 小区組的半径等于电波在一个循环前缀窗中传播的距离。
一个等于循环前缀窗对应时间长度的单纯的电波传播时延对应 的路径可以计算为
3xl08m/s X 16.7xl0-6s « 5km
如果考虑在糟糕城市环境下的多径时延， 则对应的距离为
3xl08m/s (16.7xl0-6s -6.6x10-6s) « 3km
因此， 在 BU环境下， MBMS小区组的范围可以设置为 3 ~ 4km。 对应图 1 所示的六边形划分方式， 令相距最远的两个顶点间距离为 4km。 这样， 就能够保证在一个小区组（以小区組 A为例） 内的所有 基站 （包括基站 2 )发送的数据到达位于该小区组范围内的一个用户 设备（以用户设备 1为例） 所用时间小于等于该循环前缀窗的长度， 即相应信号落在循环前缀窗之内。
按照 LTE 规范中的小区基站间距离的基本配置， 500m 和 1.732km, 这样对于基站间距离为 1.732km的网络规划， 可以将包含 相邻的 7个演进型基站的范围划分为一个 MBMS小区组； 而对于基 站间距离为 500m的网络规划，将至少包含相邻的 19个演进型基站的 范围划分为一个 MBMS小区组。
即便是在 COST 207模型的另一个典型的城市信道环境（ TU )下 (时延扩展在 0 ~ 2.4 s ), MBMS 小区组的范围也可以设置为 4 ~
5km。 这样对于基站间距离为 1.732km的网絡规划， 可以将包含相邻 的 19个演进型基站的范围划分为一个 MBMS小区组； 而对于基站间 距离为 500m的网絡规划，将至少包含相邻的 37个演进型基站的范围 划分为一个 MBMS小区组。
一个典型的 MBMS小区组划分的配置如表 1所示。
表 1
Figure imgf000020_0001
当用户设备 1位于小区中心附近时， 由于来自其它小区组中基站 的信号强度较低， 可以不考虑对这部分信号作符号合并。
图 10为根据本发明的一个具体实施方式的在划分为多个多播小 区组的无线网络的用户设备中用于对所接收的来自多个基站的多路 多播信号进行合并处理的方法流程图。 下面参照图 10并结合图 9对 该方法进行描述， 所述方法起始于步驟 S 101 :
在步骤 S101 中， 用户设备 1将经过恢复处理的多路多播信号分 离为导频信号和数据信号， 为了简明起见， 未在图中示出对信号进行 恢复处理的步骤。在本发明的一个具体实施方式中，该恢复处理包括： 模拟 /数字转换一 FFT (快速傅里叶变换）一子帧收集等。
该经过恢复处理的多路多播信号被分离为导频信号和数据信号 后， 进到步驟 S 102;
在步骤 S102中， 用户设备 1利用其预存的多个扰码 （对应小区 组 A和它的各个相邻小区组的专用扰码）分别对所述导频信号进行相 关处理， 分别生成多个经过相关处理的信号， 进到步骤 S103;
在步骤 S103 中， 由于来自小区组 A的导频信号的信号强度通常 大于来自相邻小区组的导频信号； 进一步地， 由于小区 A内的各个基 站发送导频信号前， 利用相同的扰码（小区 A的专用扰码）对其进行 解扰和相关处理， 来自小区组 A内各个基站的导频信号的内容和波形 完全一致， 于是， 就有 RF合并的存在， 信号在空间叠加， 强度增加， 因此， 来自小区组 A内的基站的导频信号（组）的信号强度明显强于 相邻小区发来的导频信号。 那么， 用户设备在此对通过比较各个导频 信号的强度， 获得一个强度最大的第一信号， 很明显， 该第一信号即 为上述的来自小区组 A内的基站的导频信号（组） ， 将其所对应的扰 码作为所归属小区组的专用扰码， 用于之后的解扰步驟， 进到步骤 S104;
在步骤 S104中，利用在步骤 S103中预先确定的小区组 A的专用扰 码对所述数据信号（包括从来自小区组 A和相邻小区组的基站的信号 中分离出的多路数据信号）进行解扰处理。 由于各个小区组所用的专 用扰码各不相同， 很容易理解， 由于解扰所用的扰码为小区组 A所对 应的专用扰码， 因此， 来自相邻小区组的数据信号经过该专用扰码参 与的解扰过程后， 全部随机化为白噪声， 被滤波器过滤掉了， 剩下的 信号即为来自小区组 A内的基站的数据信号的总合， 即归属小区组的 相关合并信号。 此后， 进到步骤 S 105;
在步骤 S105中， 由所述导频信号来确定与每个相邻小区组对应的 各个专用扰码， 用于后续操作， 进到步骤 S106;
在步骤 S 106中，利用在步骤 S105中为各个相邻小区组确定的其各 自的专用扰码对所述数据信号（包括从来自小区组 A和各个相邻小区 组的信号中分离出的数据信号）进行解扰处理， 该解扰处理的次数与 相邻小区组的个数对应， 每次解扰处理利用其中一个相邻小区组的专 用扰码对数据信号进行解扰， 与前面的描述相类似地， 经过解扰， 来 自与参与解扰的专用扰码相对应的小区组中的基站的信号成功解扰， 而其它小区组（包括小区组 A ) 中基站发送的信号则被随机化为白噪 声， 被过滤掉了。 经过相应的解扰， 生成了相邻小区组的相关合并信 号， 接着， 进到步骤 S107;
在步骤 S107中，将所述归属小区组的相关合并信号与所述相邻小 区组的相关合并信号相加， 生成符号合并信号。 图 11 为根据本发明的一个具体实施方式的在划分为多个多播小 区组的无线网络中用于对所接收的来自多个基站的多路多播信号进 行合并处理的用户设备框图。 下面参照图 11 并结合图 9对该方法进 行描述， 该用户设备 1包括， 一个相关合并装置 101和一个符号合并 装置 102, 其中， 该相关合并装置 101包括一个分离装置 1011、 一个 第一确定装置 1012 和一个第一解扰装置 1013 , 所述第一确定装置 1012进一步包括一个相关装置 10121和一个比较装置 10122， 所述符 号合并装置包括一个第二确定装置 1021和一个第二解扰装置 1022以 及一个相加装置 1023。
具体地， 所述分离装置 1011 将经过恢复处理的多路多播信号分 离为导频信号和数据信号， 为了简明起见， 未在图中示出对信号进行 恢复处理的相应装置。 在本发明的一个具体实施方式中， 该恢复处理 包括： 模拟 /数字转换一 FFT (快速傅里叶变换）一子帧收集等。
该经过恢复处理的多路多播信号被分离为导频信号和数据信号 后， 由分离装置 1011传递给该相关装置 10121 ;
相关装置 10121利用用户设备 1预存的多个扰码（对应小区组 A 和它的各个相邻小区组的专用扰码）分别对所述分离后的信号中的导 频信号进行相关处理， 分别生成多个经过相关处理的信号， 将生成的 信号传递给该比较装置 10122;
由于来自小区组 A的导频信号的信号强度通常大于来自相邻小 区组的导频信号； 进一步地， 由于小区 A内的各个基站发送导频信号 前， 利用相同的扰码（小区 A的专用扰码）对其进行加扰， 来自小区 组 A内各个基站的导频信号的内容和波形完全一致， 于是， 就有 RF 合并的存在， 信号在空间叠加， 强度增加， 因此， 来自小区组 A内的 基站的导频信号（组）的信号强度明显强于相邻小区发来的导频信号。 那么， 比较装置 10122在此通过比较各个导频信号的强度， 可以获得 一个强度最大的第一信号， 很明显， 该第一信号即为上述的来自小区 组 A内的基站的导频信号 （组） ， 将其所对应的扰码作为所归属小区 组的专用扰码， 用于之后的解扰； 所述第一解扰装置 1013利用该比较装置 10122预先确定的小区组 A的专用扰码对所述数据信号（包括从来自小区组 A和相邻小区组的 基站的信号中分离出的多路数据信号）进行解扰处理。 由于各个小区 组所用的专用扰码各不相同， 很容易理解， 由于解扰所用的扰码为小 区组 A所对应的专用扰码， 因此， 来自相邻小区组的数据信号经过该 专用扰码参与的解扰过程后， 全部随机化为白噪声， 被滤波器过滤掉 了， 剩下的信号即为来自小区组 A内的基站的数据信号的总合， 即归 属小区组的相关合并信号；
该第二确定装置 1021由所述分离装置 101 1分离出的各路导频信 号来确定与每个相邻小区组对应的各个专用扰码， 并交由一个第二解 4尤装置 1022;
该第二解扰装置 1022利用第二确定装置 1021此前为各个相邻小 区组确定的其各自的专用扰码对所述数据信号（包括从来自小区组 A 和各个相邻小区组的信号中分离出的数据信号）进行解扰处理， 该解 扰处理的次数与相邻小区组的个数对应，每次解扰处理利用其中一个 相邻小区组的专用扰码对数据信号进行解扰， 与前面的描述相类似 地， 经过解扰， 来自与参与解扰的专用扰码相对应的小区组中的基站 的信号成功解扰， 而其它小区组（包括小区组 A ) 中基站发送的信号 则被随机化为白噪声， 被过滤掉了。 经过相应的解扰， 生成了相邻小 区组的相关合并信号， 接着， 将先后得到的各个小区组的相关合并信 号传递给该相加装置 1023;
由该相加装置 1023将所述归属小区组（小区组 A )的相关合并信 号与所述相邻小区组的相关合并信号相加， 生成符号合并信号。
通常， 非相关符号合并可以获得额外的宏分集增益， 但是， 它会 为用户设备接收机引入附加的接收复杂度。
图 12为根据本发明的一个具体实施方式的为单播业务和组播业 务交错地分配时间域资源的方法示意图。
由于在各个小区单播业务的内容是不一致的， 因此到达用户设备 接收机的相应的单播干扰信号是非相关的。 这样， 由其它小区组的单 播业务引起的小区间干扰可以减弱很多， 即便是没有非相关符号合并 也可以达到信噪比的要求。
对多播业务和单播业务交错分配 TDM资源可以通过层 2的调度 来实现。 这个层 2调度的策略是由 aGW (接入网关） 来固定配置， 例如一个预先定义好的 TDM图谱从 aGW分发到各个演进型基站，多 播业务在每一个小区组的起始时刻在初始时就已被交错。
更进一步地， 既然采用了在 FFT之后的非相关符号合并， 两个无 线链路的时间差就不需要非常严格， 如 16.7μ8或者更小。这个同步要 求只与用户设备的能力相关， 因而物理层的同步就不需要在小区组间 的演进型基站之间考虑。
图 13为根据本发明的一个具体实施方式的用于对采用 OFDM信 号的多播信号进行合并处理的方法流程图。下面参照图 13并结合图 9 对该方法进行描述。
在图中， 包括来自小区组 A和各个相邻小区组中的基站的信号先 经过模拟 /数字变换后， 生成经模拟 /数字变换的信号；
对所述经模拟 /数字变换的信号进行去 CP 操作， 生成经去 CP 操作的信号；
经过子帧收集和对信号的分离操作， 利用分离出的导码， 得到各 个小区组的专用^ ^码；
利用得到的专用扰码分別对来自小区组 A和各个相邻小区组的 信号数据信号进行解扰；
将解扰后的数据信号进行符号合并 （软合并）， 再经并联 /串联 转换， 生成经并联 /串联转换的信号；
经过解码和解交织操作， 得到最终的业务数据。
本领域的技术人员通过前述描述将会理解，本发明并不限于 3GPP LTE的 MBMS系统， 而是可以应用到所有以 OFDM作为下行传输技 术的广播多播系统。
应当理解， 上述描述仅为示例性而非限制性的。 不脱离本发明的 构思和范围， 本领域的技术人员可以故出多种改变和变型， 而这些都 落入本发明的范围之内。 本发明的保护范围由所附权利要求书限定。

Claims

权 利 要 求
1. 一种基于划分了小区组的多媒体广播和组播业务数据的发送 方法， 所述发送方法包括如下步骤：
对所述多媒体广播和组播业务数据进行信道编码和数据调制； 确定所述多媒体广播和组播业务小区组的专用扰码；
确定所述多媒体广播和组播业务小区专用扰码；
针对所述经信道编码和数据调制后的多媒体广播和组播业务数 据， 利用所述小区组专用扰码对所述多媒体广播和组播业务数据进行 加扰， 并加入经所述小区组专用扰码加扰的参考信号以及经所述小区 专用扰码加扰的参考信号； 以及
发送加扰后的多媒体广播和组播业务参考信号和数据。
2. 根据权利要求 1 的多媒体广播和组播业务数据的发送方法， 其中， 所述确定小区组专用扰码步驟根据发送多媒体广播和組播业务 数据的演进节点 B自身所属小区组， 确定该小区组的专用扰码。
3. 根据权利要求 2 的多媒体广播和组播业务数据的发送方法， 其中， 每个所述小区组有不同于其他小区組的专用扰码。
4. 根据权利要求 1 的多媒体广播和组播业务数据的发送方法， 其中， 所述小区组专用扰码采用伪随机序列。
5. 根据权利要求 4 的多媒体广播和组播业务数据的发送方法， 其中， 所述伪随机序列为 Gold序列或者 Kasami序列。
6. 根据权利要求 1 的多媒体广播和组播业务数据的发送方法， 其中， 所述加扰步骤综合考虑了数据传输的有效性以及对信道响应估 计的影响， 使得加扰的所述参考信号相互间隔， 并且间隔与相关带宽 和相关时间相比拟。
7. 根据权利要求 1 的多媒体广播和组播业务数据的发送方法， 还包括在进行所述信道编码和数据调制之前， 从作为核心网边界节点 的接入网关接收所述多媒体广播和组播业务数据的步骤。
8. 根据权利要求 1-7 中的任一项的多媒体广播和组播业务数据 的发送方法， 其中， 所述小区组的划分依据电波传播时延将直径等于 或略小于一个长循环前缀窗时间电波传播的距离范围内的多个多媒 体广播和组播业务小区划分为一个多媒体广播和组播业务小区组。
9. 一种基于划分了小区组的多媒体广播和组播业务数据的接收 方法， 所述接收方法包括如下步骤：
接收加扰后的多媒体广播和组播业务参考信号和数据；
确定用于解扰的多媒体广播和组播业务小区组专用扰码； 确定用于解扰的多媒体广播和組播业务小区专用扰码；
利用所述确定的扰码， 对所述接收的多媒体广播和组播业务的参 考信号和数据进行解扰； 以及
对所述解扰后的多媒体广播和組播业务的参考信号和数据进行信道 解码和数据解调。
10. 根据权利要求 9的多媒体广播和组播业务数据的接收方法， 其中， 所述确定用于解扰的小区组专用扰码步骤中， 通过将接收多媒 体广播和组播业务数据的用户设备所存储的小区组扰码序列与接收 的加扰后的多媒体广播和组播业务参考信号和数据中的经所述小区 组专用扰码加扰的参考信号和数据进行相关计算， 确定该小区组的专 用扰码。
11. 根据权利要求 9的多媒体广播和组播业务数据的接收方法， 其中， 所述解扰步骤包括如下步骤：
利用所述小区组专用扰码， 对经所述小区組专用扰码加扰的参考信 号和数据进行解扰； 以及
利用所述小区专用扰码， 对经所述小区专用扰码加扰的参考信号进 行解扰。
12. 一种用于划分了小区组的环境的多媒体广播和组播业务数 据的发送设备， 所述发送设备包括：
信道编码和数据调制装置， 用于对所述多媒体广播和组播业务数 据进行信道编码和数据调制；
小区组专用扰码确定装置， 用于确定多媒体广播和组播业务小区 组专用扰码；
小区专用扰码确定装置， 用于确定多媒体广播和组播业务小区专 用扰码；
加扰装置， 用于针对所述经信道编码和数据调制后的多媒体广播 和组播业务数据， 利用所述小区组专用扰码对所述多媒体广播和组播 业务数据进行加扰， 并加入经所述小区组专用扰码加扰的参考信号以 及经所述小区专用扰码加扰的参考信号； 以及
加扰数据发送装置， 用于发送加扰后的多媒体广播和组播业务参 考信号和数据。
13. 根据权利要求 12的多媒体广播和组播业务数据的发送设备， 其中， 所述小区组专用扰码确定装置根据发送多媒体广播和组播业务 数据的演进节点 B所属小区组， 确定该小区组的专用扰码。
14. 根据权利要求 12的多媒体广播和组播业务数据的发送设备， 其中， 所述加扰装置综合考虑了数据传输的有效性以及对信道响应估 计的影响， 使得加扰的所述参考信号相互间隔， 并且间隔与相关带宽 和相关时间相比拟。
15. 根据权利要求 12的多媒体广播和组播业务数据的发送设备， 还包括接收装置， 用于从作为核心网边界节点的接入网关接收所述多 媒体广播和组播业务数据， 以便由所述信道编码和数据调制装置进行 处理。
16. 一种用于划分了小区组的环境的多媒体广播和组播业务数 据的接收设备， 所述接收设备包括：
加扰信号接收装置， 用于接收加扰后的多媒体广播和組播业务参 考信号和数据；
小区组解扰码确定装置， 用于确定用于解扰的多媒体广播和组播 业务小区组专用扰码；
小区解扰码确定装置， 用于确定用于解扰的多媒体广播和组播业 务小区专用扰码；
解扰装置， 用于利用所述确定的小区组专用扰码和小区专用扰 码， 对所述接收的多媒体广播和组播业务的参考信号和数据进行解 扰； 以及
信道解码和数据解调装置， 用于对所述解扰后的多媒体广播和组播 业务的参考信号和数据进行信道解码和数据解调。
17. 根据权利要求 16的多媒体广播和组播业务数据的接收设备， 其中， 所述解扰码确定装置通过将接收多媒体广播和组播业务数据的 用户设备所存储的小区组扰码序列与接收的加扰后的多媒体广播和 组播业务参考信号和数据中的经所述小区组专用扰码加扰的参考信 号和数据进行相关计算， 确定该小区组的专用扰码。
18. 根据权利要求 16的多媒体广播和组播业务数据的接收设备， 其中所述解扰装置利用所述小区组专用扰码， 对经所述小区组专用扰 码加扰的参考信号和数据进行解扰， 以及利用所述小区专用扰码， 对 经所述小区专用扰码加扰的参考信号进行解扰。
19. 一种节点 B , 包括根据权利要求 12-15中的任一项的多媒体 广播和组播业务数据的发送设备。
20. 一种用户设备， 包括根据权利要求 16-18中的任一项的多媒 体广播和组播业务数据的接收设备。
21. 一种利用正交频分复用下行传输的多媒体广播和组播业务 数据的传输系统， 包括才 居权利要求 19的演进节点 B以及根据权利 要求 20的用户设备。
22. 一种在划分为多个小区组的无线网络的用户设备中用于对所 接收的来自多个网络节点的多路多播信号进行合并处理的方法， 所述 多个网络节点分属不同的小区组，其特征在于，该方法包括以下步骤： a. 对所接收的所述多路多播信号的空间合并信号中具有该用户 设备所属小区组专用扰码的多播信号进行相关合并， 以生成归属小区 组的相关合并信号。
23. 根据权利要求 21所述的方法， 其特征在于， 所述步骤 a还包 括以下步骤：
al . 将经过恢复处理的多路多播信号分离为导频信号和数据信 号；
a2. 由所述导频信号来确定该用户设备所归属的小区组的专用扰 码；
a3. 利用所确定的小区组专用扰码对所述数据信号进行解扰处 理， 以生成所述归属小区组的相关合并信号。
24. 根据权利要求 23所述的方法， 其特征在于， 所述步骤 a2还 包括以下步骤：
a21. 利用预存的多个扰码分别对所述导频信号进行相关处理， 分 别生成多个经过相关处理的信号；
a22. 通过比较所述多个经过相关处理的信号的强度， 获得一个强 度最大的第一信号， 将所述第一信号所对应的扰码作为所归属小区组 的专用扰码。
25. 根据权利要求 22 - 24 中任一项所述的方法， 其特征在于， 还包括以下步骤：
b . 对于所述空间合并信号中具有不同扰码的多播信号进行非相 关符号合并， 以生成符号合并信号。
26， 根据权利要求 25所述的方法， 其特征在于， 所述步骤 b包 括：
b 1. 由所述导频信号来确定该用户设备相邻小区组的专用扰码； b2. 利用所述相邻小区组的专用扰码对所述数据信号进行解扰处 理， 以生成相邻小区组的相关合并信号；
b3. 将所述归属小区组的相关合并信号与所述相邻小区组的相关 合并信号相加， 以生成所述符号合并信号。
27. 根据权利要求 23 - 26所述的方法， 其特征在于， 所述多路 多播信号为 OFDM信号， 所述恢复处理为去 OFMD处理。
28. 一种在无线网络中用于对所接收的来自多个网络节点的多路 多播信号进行合并处理的用户设备， 其特征在于， 包括：
一个相关合并装置， 用于对所述多路多播信号的空间合并信号中 具有相同扰码的多播信号进行相关合并， 以生成相关合并信号。
29. 根据权利要求 28所述的用户设备， 其特征在于， 所述相关 合并装置包括：
一个分离装置， 用于将经过恢复处理的多路多播信号分离为导频 信号和数据信号；
一个第一确定装置， 用于由所述导频信号来确定该用户设备所归 属的小区组的专用扰码；
一个第一解扰装置， 用于利用所确定的小区组专用扰码对所述数 据信号进行解扰处理， 以生成所述归属小区组的相关合并信号。
30. 根据权利要求 29所述的用户设备， 其特征在于， 所述第一 确定装置包括：
一个相关装置， 用于利用预存的多个扰码分别对所述导频信号进 行相关和去噪处理， 分别生成多个经过相关处理的信号；
一个比较装置， 用于通过比较所述多个经过相关处理的信号的强 度， 获得一个强度最大的第一信号， 将所述所对应的扰码作为所归属 小区組的专用扰码。
31. 根据权利要求 28 - 30 中任一项所述的用户设备， 其特征在 于， 还包括：
一个符号合并装置， 用于对于所述空间合并信号中具有不同扰码 的多播信号进行非相关符号合并， 以生成符号合并信号。
32. 根据权利要求 31 所述的用户设备， 其特征在于， 所述符号 合并装置还包括：
一个第二确定装置， 用于由所述导频信号来确定该用户设备相邻 小区组的专用扰码；
一个第二解扰装置， 用于利用所述相邻小区組的专用扰码对所述 数据信号进行解扰处理， 以生成相邻小区组的相关合并信号；；
一个相加装置， 用于将所述归属小区组的相关合并信号与所述相 邻小区组的相关合并信号相加， 以生成所述符号合并信号。
33. 根据权利要求 28 - 32所述的用户设备， 其特征在于， 所述 多路多播信号为 OFDM信号， 所迷恢复处理为去 OFMD处理。
34. 一种在划分为多个小区组的无线网络中用于传输多播信号的 方法， 其中， 每个小区组包括多个网络节点及其所辖小区， 其特征在 于，
每个小区组的网络节点利用同一专用扰码对将要发送信号进行 力口扰。
35. 根据权利要求 34所述的方法， 其特征在于， 所述小区组的 直径等于或小于所述多播信号中循环前缀窗时间内电波传播的距离。
36. 一种在划分为多个小区組的用于传输多播信号的无线网絡， 其中， 每个小区组包括多个网絡节点及其所辖小区， 其特征在于， 每个小区组的网络节点利用同一专用扰码对将要发送信号进行 力口扰。
37. 根据权利要求 36所述的无线网络， 其特征在于， 所述小区 组的直径等于或小于所述多播信号中循环前缀窗时间内电波传播的 距离。 '
38. 一种在划分为多个小区组的无线网络的接入设备中用于为多 播业务调度时间域资源的方法， 其特征在于， 在对分发给所辖小区组 的单播业务和多播业务进行时分复用时交错地分配时间域资源， 以确 保同一时间最多仅有一个小区组传输多播业务。
39. 一种在划分为多个小区组的无线网络中用于为多播业务调度 时间域资源的接入设备， 其特征在于， 在对分发给所辖小区组的单播 业务和多播业务进行时分复用时交错地分配时间域资源， 以确保同一 时间最多仅有一个小区组传输多播业务。
PCT/CN2007/001953 2006-06-27 2007-06-21 Procédé et appareil de transmission et de réception de données mbms évolutionnelles WO2008003227A1 (fr)

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JP2009516861A JP5320288B2 (ja) 2006-06-27 2007-06-21 発展的なｍｂｍｓデータを送受信する方法および装置
KR1020087031037A KR101388947B1 (ko) 2006-06-27 2007-06-21 진화된 ｍｂｍｓ 데이터를 송신하고 수신하는 방법 및 장치

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