WO2007131419A1 - Procédé et système de transmission d'un service d'émission multidestination - Google Patents

Procédé et système de transmission d'un service d'émission multidestination Download PDF

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Publication number
WO2007131419A1
WO2007131419A1 PCT/CN2007/001382 CN2007001382W WO2007131419A1 WO 2007131419 A1 WO2007131419 A1 WO 2007131419A1 CN 2007001382 W CN2007001382 W CN 2007001382W WO 2007131419 A1 WO2007131419 A1 WO 2007131419A1
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WIPO (PCT)
Prior art keywords
frequency
cell
broadcast multicast
service data
resource
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PCT/CN2007/001382
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English (en)
Chinese (zh)
Inventor
Junwei Wang
Xiao Zhou
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Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007131419A1 publication Critical patent/WO2007131419A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention relates to a frequency reuse technique and a broadcast multicast technology in a mobile communication network, and more particularly to a transmission method and system for a broadcast multicast service. Background technique
  • the frequency other than the primary frequency is used as the secondary frequency of each cell (see the shaded part in Figure 3 for the secondary frequency).
  • the primary frequency in cell 1 acts as the corresponding secondary frequency in cell 2, and the other is the same; in each cell, the available power on the secondary frequency is usually limited, even if it is available on the secondary frequency. The power is 4 ⁇ at the available power on the main frequency.
  • MBMS Multimedia Broadcast Multicast Service
  • the other is a single-cell transmission mode, which refers to a way in which a single cell transmits MBMS services without considering the transmission situation of other cells.
  • each of the broadcast multicast cells participating in the transmission occupies a dedicated frequency resource for transmitting the MBMS service, and the frequency resource occupied by the MBMS service can no longer be used for transmission of other services.
  • each broadcast multicast cell directly occupies part of its own primary frequency and secondary frequency for transmitting MBMS services, and the frequency resources occupied by the MBMS service can no longer be used for the unicast service of the corresponding cell, that is, each broadcast.
  • the multicast cell can no longer use this part of the frequency resource for the secondary frequency.
  • the corresponding cell that originally used this part of the frequency as the primary frequency can no longer use this part of the frequency resource as the primary frequency.
  • FIG. 4 it is a schematic diagram of a frequency occupation state when frequency division multiplexing is performed between different cells in a mobile communication network based on the SFR mode, and MBMS services are transmitted between different cells based on the multi-cell transmission mode, as shown in the figure.
  • the part of the frequency band occupied by the MBMS service in the adjacent cell will no longer be able to serve the user at the cell edge, that is, some neighboring cells will lose their own primary frequency.
  • cells 2, 4, and 6 lose their own frequency components.
  • the unicast cell transmits the MBMS service on the frequency of the broadcast multicast cell
  • the unicast data corresponding to the high-power transmission is transmitted.
  • the user in the transitional section between the broadcast multicast cell and the unicast cell receives the MBMS service sent by the broadcast multicast cell, it is bound to be interfered by the unicast data service.
  • FIG. 5 a schematic diagram of a state in which a broadcast multicast cell and a unicast cell are adjacent to each other, where cells 1, 2, 5, and 6, respectively are broadcast multicast cells, and cells 3 and 4 are respectively unicast cells. Then, the receiving performance of the user C receiving the MBMS service in the transition zone is inevitably worse than that of the users A and B.
  • the prior art proposes to change the primary frequency transmit power of the unicast cell.
  • the transmission power is the same as the secondary frequency (as shown in Figure 5, the right blank portion of the frequency band is originally the primary frequency of the corresponding unicast cell, and its transmission power is changed to be the same as the secondary frequency transmission power), that is, the unicast cell 3, 4 is on the edge.
  • the transmit power used on the primary frequency of the zone is the same as the transmit power used on the secondary frequency of the central zone, thereby avoiding interference to users receiving MBMS services in the transition zone adjacent to the broadcast multicast cell.
  • the embodiment of the present invention provides a method for transmitting a broadcast multicast service, including the steps of: determining, by using a frequency multiplexed cell, a radio resource occupied by a broadcast multicast service data transmitted by a broadcast multicast cell based on a multi-cell transmission mode; And limiting, when the broadcast multicast cell transmits the broadcast multicast service data based on the determined radio resource, the radio resource used by the neighboring cell of the broadcast multicast cell in the determined radio resource.
  • the embodiment of the present invention provides a transmission system for a broadcast multicast service, including: a frequency determining unit, configured to determine, in a cell that uses frequency multiplexing, a broadcast multicast service data of a broadcast multicast cell based on a multi-cell transmission mode The occupied radio resource; the resource usage limiting unit, configured to: when the broadcast multicast service transmits the broadcast multicast service data by using the radio resource determined by the frequency determining unit, the determined radio with the neighboring cell of the broadcast multicast cell Restrictions on the wireless resources used within the resource.
  • the embodiment of the present invention considers that in a frequency-multiplexed cell communication environment, when a neighboring cell of a broadcast multicast cell transmits a small amount of traffic, the radio resource occupied by the broadcast multicast service transmitted by the broadcast multicast cell may be used. To the probability that the cell adjacent to the broadcast multicast cell is restricted from using the radio resource in the radio resource occupied by the broadcast multicast service data transmitted by the broadcast multicast cell, for example, the neighboring cell may be broadcast based on the transmission broadcast.
  • Frequency resources occupied by business data Synchronously transmitting broadcast multicast service data with the broadcast multicast cell; or letting the neighboring cell not transmit any service data or reduce power transmission service data in the frequency resource occupied by the broadcast multicast service data, thereby improving the number of broadcasts
  • the user in the transition zone between the broadcast cell and the neighboring cell receives the received power of the broadcast multicast service, thereby improving the receiving performance of the broadcast multicast service received by the user in the transition zone.
  • FIG. 4 is a schematic diagram of a frequency occupation state when frequency division multiplexing is performed between different cells in a mobile communication network based on an SFR method, and MBMS services are transmitted between different cells based on a multi-cell transmission mode;
  • FIG. 6 is a schematic flowchart of an embodiment of a method for transmitting a broadcast multicast service according to the present invention
  • FIG. 9 is a schematic diagram of a frequency resource distribution state in which a primary frequency resource occupied by MBMS service data in a unicast cell is used to transmit MBMS service data in an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a frequency resource distribution state in which a secondary frequency resource occupied by MBMS service data in a unicast cell is used to transmit MBMS service data in an embodiment of the present invention
  • FIG. 11 is a main frequency occupied by MBMS service data in a unicast cell according to an embodiment of the present invention, Schematic diagram of a frequency resource distribution state in which a secondary frequency resource is used to transmit MBMS service data;
  • FIG. 12 is a schematic diagram of a modulation and demodulation processing procedure of a basic OFDM system;
  • FIG. 13 is a schematic diagram of a frequency resource distribution state in which a unicast cell transmits MBMS service data by using a primary frequency occupied by MBMS service data according to an embodiment of the present invention
  • Figure 14 is a diagram showing the state of specific input data before performing IFFT processing in an OFDM system according to the above embodiment of the present invention.
  • 15 is a schematic flowchart of an implementation principle of another method for transmitting a broadcast multicast service according to the present invention.
  • 16 is a schematic diagram of a frequency resource distribution state in which no data transmission is performed on a frequency resource occupied by MBMS service data in a unicast cell in the embodiment of the present invention
  • FIG. 17 is a schematic diagram of a frequency resource distribution state in which a transmission power transmission service data is reduced on a frequency resource occupied by MBMS service data in a unicast cell according to an embodiment of the present invention
  • FIG. 18 is a schematic diagram of a frequency resource distribution state in which a primary frequency is changed into a secondary frequency transmission service data on a frequency resource occupied by MBMS service data in a unicast cell according to an embodiment of the present invention
  • FIG. 19 is a structural block diagram of an embodiment of a broadcast multicast service transmission system according to the present invention.
  • FIG. 20 is a block diagram showing a specific structure of an embodiment of a frequency selection unit in the system of the present invention. detailed description
  • the embodiment of the present invention is directed to the problem that the receiving power of the MBMS service received by the user in the transition zone between the broadcast multicast cell and the neighboring cell transmitting the MBMS service in the multi-cell transmission mode is lower when the frequency is multiplexed between different cells. Considering that when the amount of transmission traffic is relatively small in the neighboring cell, there may be a probability that the radio resource occupied by the MBMS service in the broadcast multicast cell will not be used, and it is proposed that the MBMS service can be transmitted by the broadcast multicast cell in the neighboring cell.
  • the occupied radio resources that may not be used by the transmitted service data are used to synchronously transmit MBMS service data with the broadcast multicast cell, or not transmit any service data, or reduce power transmission service data, thereby avoiding frequency resources.
  • the waste can improve the receiving power of the MBMS service received by the user in the transition zone between the broadcast multicast cell and the neighboring cell, thereby improving the user reception in the transition zone. Receive performance of MBMS services.
  • the radio resource occupied by the MBMS service data of the broadcast multicast cell based on the multi-cell transmission is determined in the cell that uses frequency multiplexing; and then determined based on the broadcast multicast cell.
  • the radio resource transmits the MBMS service data the neighboring cell of the broadcast multicast cell is restricted from using the same radio resource as the determined radio resource.
  • the cell adjacent to the broadcast multicast cell that transmits the MBMS service data includes a unicast cell, a broadcast multicast cell, a hybrid carrier cell, and the like in a predetermined area around the broadcast multicast cell, and each of the neighboring cells
  • the strength of the radio resource used by the cell is inversely proportional to the distance of the cell from the broadcast multicast cell, that is, the closer the cell is to the broadcast multicast cell, the greater the strength of the radio resource used for the cell, and the greater the distance broadcast. The farther away the cell is, the smaller the strength of the radio resources it uses.
  • determining that the radio resource occupied by the broadcast multicast cell based on the multi-cell transmission mode MBMS service data includes time resources, frequency resources, and transmission power resources.
  • the neighboring cell of the broadcast multicast cell is a unicast cell adjacent to the broadcast multicast cell, and the determined radio resource is a frequency resource for transmitting broadcast multicast service data, and the technical solutions of the present invention are combined with the respective drawings.
  • the implementation principle, the specific implementation manner, and the corresponding beneficial effects can be elaborated.
  • the specific implementation of other neighboring cells is similar to the specific implementation of the adjacent unicast cell. No more details will be given.
  • FIG. 6 is a schematic flowchart of an embodiment of a method for transmitting a broadcast multicast service according to the present invention, and the implementation principle thereof is as follows:
  • Step 10 In the frequency multiplexed cell, determine a frequency resource occupied by the broadcast multicast service data of the broadcast multi-cell transmission based on the multi-cell transmission mode;
  • the access gateway (AGW) determines the frequency resource occupied by the broadcast multicast service data of the broadcast multicast cell based on the multi-cell transmission mode, and notifies the determined frequency resource information to the corresponding broadcast multicast cell.
  • a unicast cell adjacent to a broadcast multicast cell receives broadcast multicast in a transition zone occupied by the broadcast multicast service data. All or part of the service performance, the broadcast multicast service data will continue to be transmitted to improve the receiving performance of the broadcast multicast service received by the users in the transition zone; of course, the frequency band resources occupied by the broadcast multicast service data in the unicast cell It is not possible to serve unicast users in a unicast cell at the same time.
  • different cells can be frequency-multiplexed based on the interference coordination technology, for example, the frequency multiplexing process is preferably performed by using the SFR method.
  • the occupant occupied by the unicast cell adjacent to the broadcast multicast cell is determined as:
  • the first type the upper layer first obtains the frequency band allocation information of the unicast cell in the frequency reuse state; and selects the corresponding frequency in the frequency band occupied by the unicast cell and the same frequency resource according to the frequency band allocation information of the unicast cell.
  • the high layer notifies the selected frequency resource information to the unicast cell; the subsequent higher layer dynamically adjusts the selected frequency resource in the same frequency band as the determined frequency resource occupied by the unicast cell according to the specific change information of the unicast cell.
  • the adjusted frequency resource information is notified to the unicast cell again.
  • the second layer the upper layer notifies the determined frequency resource information occupied by the broadcast multicast service data of the broadcast multicast cell to the unicast cell adjacent to the broadcast multicast cell;
  • the unicast cell selects the corresponding frequency resource in the same frequency band as the determined frequency resource according to the frequency band allocation information in the frequency reuse state; the subsequent unicast cell can also be at any time according to its specific change information.
  • the selected frequency resource is dynamically adjusted in the frequency band occupied by itself and the determined frequency resource.
  • W 200 is an example of frequency reuse processing using SFR mode between cells as an example to illustrate frequency resources.
  • W 200 is an example of frequency reuse processing using SFR mode between cells as an example to illustrate frequency resources.
  • FIG. 7 a schematic diagram of a process for completing a broadcast multicast service transmission based on a first frequency resource selection manner in the embodiment of the present invention is as follows:
  • the upper layer (such as the AGW) issues an instruction to inform the broadcast multicast cell of the broadcast multicast service data on which time resources and frequency resources are sent;
  • the upper layer (such as the AGW) issues an instruction to query the primary and secondary frequency band allocation information of the unicast cell adjacent to the broadcast multicast cell in the SFR multiplexing state, and the current traffic busyness information of the unicast cell;
  • the unicast cell counts its current unicast traffic, and obtains the corresponding traffic busyness information according to the statistical result.
  • the unicast cell bases itself on the primary and secondary frequency band allocation information in the SFR multiplexing state and its current service. Busy information feedback to the upper level (AGW);
  • the upper layer selects the corresponding frequency resource in the same frequency band as the broadcast multicast service data occupation frequency resource occupied by the unicast cell according to the primary and secondary frequency band allocation information and the current service busyness information fed back by the unicast cell. And selecting and notifying the same time resource to the time resource of the broadcast multicast cell; and then issuing an instruction to notify the unicast cell to send the broadcast multicast service data on the selected frequency resource and the time resource;
  • the broadcast multicast cell and the unicast cell respectively transmit the broadcast multicast service data according to the frequency resource and the time resource notified by the upper layer (AGW).
  • the upper layer needs to correspondingly occupy the unicast cell when it knows that the traffic busyness information of the unicast cell changes.
  • Dynamically adjusting the selected frequency resource in the same frequency band as the broadcast multicast service data occupation frequency resource, and timely notifying the adjusted selected frequency resource information to the unicast cell for example, the unicast traffic in the unicast cell is increased.
  • the selected frequency resource may need to be reduced. If the unicast traffic in the unicast cell is reduced, the selected frequency resource may need to be increased.
  • a schematic diagram of a process for completing a broadcast multicast service transmission based on a second frequency resource selection manner in the embodiment of the present invention is as follows:
  • the upper layer (such as the AGW) issues an instruction to inform the broadcast multicast cell of the broadcast multicast service data on which time resources and frequency resources are sent; 20.
  • the upper layer (such as the AGW) also issues an instruction to inform the unicast cell adjacent to the broadcast multicast cell that the broadcast multicast service data will be sent on the time resource and the frequency resource; the unicast cell according to itself
  • the primary and secondary frequency band allocation information in the SFR multiplexing state and the traffic busyness information obtained by statistically comparing the current unicast traffic volume are in the same frequency band as the broadcast multicast service data occupying frequency resource. Select the corresponding frequency resource;
  • the broadcast multicast cell sends the broadcast multicast service data according to the frequency resource and the time resource notified by the upper layer (AGW), and simultaneously the neighboring unicast cell according to the selected frequency resource and the time resource notified by the upper layer (AGW). Send broadcast multicast service data.
  • the unicast cell finds that its current traffic busyness information changes, it also needs to dynamically adjust the selection according to its changed traffic busyness information in the same frequency band as the broadcast multicast service data occupation frequency resource. Frequency resources.
  • the broadcast multicast can be occupied by the unicast cell adjacent to the broadcast multicast cell.
  • the frequency resource selected by the user in the unicast cell edge area may be selected as the frequency resource of the unicast cell edge area user service, and may also be selected as the unicast cell edge area user service. Frequency resources and frequency resources for users in the central area of the unicast cell.
  • the frequency multiplexing between the cells based on the SFR method is taken as an example to specifically describe various situations in which the frequency resources are selected in the frequency bands occupied by the unicast cell and the frequency resources occupied by the broadcast multicast service data.
  • the frequency resource that is the primary frequency of the unicast cell is selected in a frequency band that is the same as the frequency resource occupied by the broadcast multicast service data that is occupied by the unicast cell adjacent to the broadcast multicast cell, so that the unicast cell is selected based on the frequency.
  • the primary frequency resource transmits the broadcast multicast service data synchronously with the broadcast multicast cell. As shown in FIG.
  • the number of MBMS services in the unicast cell is set to Cell 3, 4 in FIG. 9 as a unicast cell, respectively, and Cell 1 , 2, 5, 6, 7 are respectively based on A multi-cell transmission mode transmits a broadcast multicast cell of MBMS service data, wherein the transmission of the MBMS service data occupies part of the secondary frequency resources of Cell 1, and occupies part of the secondary frequency resources and partial masters of Cell 3.
  • the frequency resource also occupies part of the secondary frequency resource and all the primary frequency resources of the cell 4; H ⁇ users A, B, and C are respectively located in the broadcast multicast cell, and the user D is located in the unicast cell Cell 4, typically, the user C Located in a transition zone between a broadcast multicast cell and an adjacent unicast cell.
  • a unicast cell transmits unicast data based on a primary frequency consistent with a frequency resource occupied by a broadcast multicast cell to transmit MBMS service data
  • the user C located in the transition zone receives the phase when receiving the MBMS service data.
  • the neighboring unicast cell 3, 4 transmits the interference of the unicast service, in order to avoid the interference of the unicast service when the user in the transition zone receives the MBMS service data, and at the same time improve the receiving power of the MBMS service data received by the user in the transition zone, based on
  • the same MBMS service data can be synchronously transmitted on the main frequency band occupied by the MBMS service data transmission, and the unicast cells 3 and 4 respectively use the occupied frequency resource.
  • the black and white grid in the middle indicates the frequency portion to transmit the MBMS service data, and the MBMS service data may also be transmitted using a part of the frequencies in the frequency portion indicated by the black and white grid.
  • the frequency resource that is the same as the frequency resource occupied by the broadcast multicast service data, which is occupied by the unicast cell adjacent to the broadcast multicast cell may be selected as the frequency resource of the unicast cell secondary frequency, so that the unicast cell is based on the selected
  • the secondary frequency resource transmits the broadcast multicast service data synchronously with the broadcast multicast cell.
  • FIG. 10 it is a schematic diagram of a frequency resource distribution state in which a secondary frequency resource occupied by MBMS service data in a unicast cell is used to transmit MBMS service data in the embodiment of the present invention.
  • the frequency resources of the primary frequency and the secondary frequency of the unicast cell may be separately selected, so that the unicast cell synchronously transmits the broadcast multicast service data according to the selected primary secondary frequency resource and the broadcast multicast cell, as shown in FIG. 11 .
  • FIG. 11 A schematic diagram of a frequency resource distribution state in which a primary frequency and a secondary frequency resource occupied by MBMS service data in a unicast cell are used to transmit MBMS service data in the method of the present invention.
  • the unicast cell and the broadcast multicast cell synchronously transmit the broadcast multicast service data
  • the unicast cell transmits the broadcast multicast service data, which is also subject to the transmission power control in the interference coordinated frequency reuse state, such as subject to SFR multiplexing. Transmission power control in the state.
  • This embodiment takes the communication environment shown in FIG. 9 as an example, and Cell 1, 2, 5, 6, and 7 are broadcast multicast cells, respectively, Cell 3 And 4 are unicast cells respectively, assuming that the seven cells are based on communication transmission
  • the bandwidth is 10 MHz for SFR multiplexing processing based on the multiplexing factor of 3, so that the transmission bandwidth of 10 MHz is divided into 12 sub-bands, each sub-band contains 30 sub-carriers, and one TTI is 0.5 sec.
  • the 12 x 30 subcarriers are divided into three groups, and each cell selects one of the subcarriers as the primary subcarrier of the current cell, that is, as the primary frequency of the local cell, and other unselected two subcarriers serve as the secondary subcarrier of the cell.
  • the carrier that is, the secondary frequency of this cell.
  • the embodiment herein refers to implementing MBMS service data transmission on an Orthogonal Frequency Division Multiplex (OFDM) mobile communication system, as shown in FIG. 12, which is a schematic diagram of a modulation and demodulation process of a basic OFDM system.
  • OFDM Orthogonal Frequency Division Multiplex
  • the user data is first subjected to channel coding and interleaving processing, and then the coded interleaved data is modulated to form user data symbols by using a modulation method (such as BPSK, QPSK, and QAM).
  • the data symbols are then modulated onto the radio frequency after OFDM operation, wherein the reverse demodulation process is reversed from this process, and will not be repeated here.
  • the user data symbols are first serial/parallel converted to form a plurality of low-rate sub-data streams, wherein each sub-data stream occupies one sub-carrier, and each sub-data stream is mapped to a corresponding sub-carrier.
  • the above processing can be implemented by inverse discrete Fourier transform (IDFT) or inverse fast Fourier transform (IFFT) processing.
  • IDFT inverse discrete Fourier transform
  • IFFT inverse fast Fourier transform
  • CP Cyclic Prefix
  • the cyclic prefix (CP) is added to the time domain signal processed by IDFT or IFFT as a guard interval, which can greatly reduce or even eliminate inter-symbol interference, and guarantee each channel.
  • the orthogonality between them greatly reduces the interference between channels.
  • the embodiment here assumes that the primary frequency occupied by the broadcast multicast cell 1 is 0 ⁇ 3.3 MHz, the primary frequency occupied by the unicast cell 3 is 3.4 MHz ⁇ 6.7 MHz, and the primary frequency occupied by the unicast cell 4 is 6.8 MHz ⁇ 10 MHz,
  • the broadcast multicast cell is notified to occupy the frequency band resource between 4 MHz and 10 MHz to transmit the MBMS service data (1, 2, ..., 5, 6).
  • the frequency band for transmitting the MBMS service data allocated by the upper layer for the unicast cells 3 and 4 is the total frequency of the frequency band covered by the MBMS service data, and the unicast cell 3 will be broadcasted in the frequency band of 4 MHz - 6.7 MHz.
  • the multicast cell synchronously transmits BMS service data, and the unicast cell 4 will transmit synchronously with the broadcast multicast cell in the frequency band of 6.8 MHz to 10 MHz.
  • the MBMS service data, its specific frequency resource distribution status is shown in Figure 13.
  • FIG. 14 is a schematic diagram of a specific input data state before performing IFFT processing in an OFDM system according to the above embodiment of the present invention, in which a transmission bandwidth of 4 MHz to 10 MHz is occupied in a broadcast multicast cell 1 (MBMS Cell 1). Input BMS service data (1, 2, ... 5, 6); and occupy 4MHz ⁇ 6.7MHz transmission bandwidth in Unicast Cell 3 to input MBMS service data (5, 6); The transmission bandwidth of 6.8 ⁇ - 10 MHz is occupied in the broadcast cell 4 (Unicast Cell 4) to input the MBMS service data (1, 2, 3, 4).
  • the technical solution of the present invention also considers that the problem that the user receives the broadcast multicast service data in the transition zone between the broadcast multicast cell and the adjacent unicast cell is low, possibly due to the unicast cell transmitting the unicast data pair transition.
  • the interference caused by the user in the zone is too large.
  • the unicast cell may not transmit any service data in the frequency band covered by the frequency resource occupied by the broadcast multicast service data.
  • unicast service data and broadcast multicast service data or transmitting unicast service data by reducing transmission power, thereby reducing interference caused by users receiving broadcast multicast service data in the transition zone, and improving the transition zone in disguise
  • the user receives the received power of the broadcast multicast service data, thereby improving the receiving performance of the user receiving the broadcast multicast service data in the transition zone.
  • FIG. 15 the figure is a schematic flowchart of another embodiment of a method for transmitting a broadcast multicast service according to the present invention.
  • the implementation process is as follows:
  • Step 100 In a cell that uses frequency reuse (such as interference multiplexing based frequency reuse, typically, such as SFR), determine a frequency resource occupied by a broadcast multicast service data transmitted by a broadcast multicast cell based on a multi-cell transmission mode. ;
  • frequency reuse such as interference multiplexing based frequency reuse, typically, such as SFR
  • the high-level (such as AGW) may determine that the broadcast multicast cell transmits the broadcast multicast service data.
  • the occupied frequency resource and notifying the determined frequency resource information to the broadcast multicast cell and the adjacent unicast cell respectively;
  • Step 200 The broadcast multicast cell transmits the broadcast multicast service data on the determined frequency resource, and at the same time, in the unicast cell adjacent to the broadcast multicast cell, in the same frequency band as the determined frequency resource. No transmission of any service data (including unicast service data and broadcast multicast service data), or transmission of unicast service data by reducing the transmission power mode, thereby reducing the reception of broadcast multicast service data by users in the transition zone. The interference caused by the user in the transition zone improves the receiving performance of the broadcast multicast service data.
  • FIG. 16 is a schematic diagram of a frequency resource distribution state in which no data transmission is performed on a frequency resource occupied by MBMS service data in a unicast cell in the embodiment of the present invention, and thus In unicast cells 3 and 4, no traffic data transmission will be performed in the same frequency band as the frequency resource occupied by the broadcast multicast cell transmission MBMS service data, including no unicast service data transmission and no transmission. Transmission of MBMS service data, etc.
  • FIG. 17 is a schematic diagram of MBMS service data in a unicast cell in the embodiment of the present invention. It can be seen that in the unicast cells 3 and 4, the MBMS service data is transmitted in the occupied and broadcast multicast cells. In the frequency band with the same frequency resource, the primary frequency transmission power and the secondary frequency transmission power are both reduced, and then the service data (including unicast service data and broadcast multicast) is transmitted based on the primary frequency and the secondary frequency after reducing the transmission power respectively. Business data).
  • FIG. 18 it is a schematic diagram of a frequency resource distribution state in which a primary frequency is changed into a secondary frequency transmission service data on a frequency resource occupied by MBMS service data in a unicast cell according to an embodiment of the present invention.
  • the primary frequency transmission power is reduced to the secondary frequency transmission power data (including the unicast service data and the frequency band occupied by the MBMS service data occupied by the broadcast multicast cell). Broadcast multicast service data).
  • FIG. 19 is a structural block diagram of an embodiment of a broadcast multicast service transmission system according to the present invention, which includes a frequency determining unit 10 and a resource usage limiting unit 20, wherein resource usage restrictions are used.
  • the unit 20 further includes a frequency selection unit 201 and a service data transmission unit 202, wherein the specific functions of the respective constituent units are as follows:
  • the frequency determining unit 10 is configured to determine, in a cell that uses frequency multiplexing, a radio resource occupied by a broadcast multicast service data transmitted by a broadcast multicast cell based on a multi-cell transmission mode (for example, it may be occupied by transmitting broadcast multicast service data) Frequency resource, time resource, and transmission power resource, etc., the following description uses the radio resource determined here as a frequency resource for transmitting broadcast multicast service data as an example); the resource use restriction unit 20 is configured to broadcast multicast When the cell transmits the broadcast multicast service data based on the radio resource determined by the frequency determining unit 10, the radio resource used in the determined radio resource is restricted to the neighboring cell of the broadcast multicast cell, where it includes:
  • the frequency selection unit 201 is configured to select a corresponding frequency resource in a frequency band that is the same as the frequency resource determined by the frequency determining unit 10 occupied by the neighboring cell of the broadcast multicast cell;
  • the service number transmission unit 202 is configured to synchronize the transmission of the broadcast multicast service data by the neighboring cell based on the frequency resource selected by the frequency selection unit 201 and the frequency resource determined by the broadcast determining unit 10 by the broadcast multicast cell.
  • FIG. 20 it is a block diagram of a specific structure of an embodiment of a frequency selection unit in the system of the present invention, which specifically includes a frequency band allocation acquisition subunit 2011, a frequency selection subunit 2012, and a selection frequency adjustment subunit 2013, wherein each component unit
  • the specific role is as follows:
  • the frequency selection sub-unit 2012 is configured to select, according to the frequency band allocation information determined by the frequency band allocation acquisition sub-unit 2011, the corresponding frequency resource in a frequency band that is occupied by the neighboring cell and is the same as the frequency resource determined by the frequency determining unit 10;
  • the frequency adjustment subunit 2013 is configured to dynamically adjust the frequency resource that the frequency selection subunit 2012 has selected in the frequency band that is occupied by the neighboring cell and is the same as the frequency resource determined by the frequency determining unit 10.
  • the frequency selecting unit 201 may be small in the vicinity of the broadcast multicast cell.
  • the frequency resource selected by the area and the frequency resource determined by the frequency determining unit 10 is selected as the frequency resource of the unicast cell edge area user monthly service, and may also be selected as the frequency resource of the user service in the neighboring cell center area, and may also be selected at the same time.
  • the frequency selection unit 201 may select the frequency resource that is the primary frequency of the neighboring cell, or may select the frequency resource that is the secondary frequency of the neighboring cell, and may also be selected as the neighboring cell master.
  • the frequency resource of the frequency and the frequency resource that is the secondary frequency of the neighboring cell may be further included on the basis of the foregoing structure of FIG. 18 for transmitting the transmission power to the service data transmission unit 202 in the neighboring cell based on the transmission power in the SFR multiplexing state.
  • the process of broadcasting multicast service data is power controlled.
  • the resource usage restriction unit 20 may also limit the neighboring cells of the broadcast multicast cell to include unicast service data and broadcast multicast service data to reduce interference caused by users receiving broadcast multicast service data in the transition zone. , thereby improving the receiving performance of the user receiving the broadcast multicast service data in the transition zone.
  • the resource usage restriction unit 20 may also limit the neighboring cells of the broadcast multicast cell to reduce the power transmission service data in the frequency band occupied by the same frequency resource, including reducing the primary frequency transmission power therein, or The primary frequency and the secondary frequency transmission power are both reduced to transmit service data (including unicast service data and broadcast multicast service data). It can also reduce the interference caused by users receiving broadcast multicast service data in the transition zone, thereby improving the receiving performance of users receiving broadcast multicast service data in the transition zone.
  • the cell adjacent to the broadcast multicast cell that transmits the MBMS service data includes a unicast cell and a broadcast multicast cell in a predetermined area around the broadcast multicast cell. And a mixed carrier cell or the like, and the strength of the resource usage restriction unit 20 limiting the radio resources used by each cell in the neighboring cell is inversely proportional to the distance of the cell from the broadcast multicast cell, that is, the cell closer to the broadcast multicast cell.
  • the resource use restriction unit 20 has a higher intensity of restriction on the radio resources used, and the farther the distance from the broadcast multicast cell is, the smaller the strength of the resource use restriction unit 20 to limit the radio resources used.

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

Abstract

L'invention concerne un procédé destiné à la transmission d'un service d'émission multidestination. Dans ce procédé, dans lequel sont utilisées des cellules AMRF, les ressources radio sont déterminées, celles-ci étant utilisées pour la transmission de données de service d'émission multidestination entre les cellules sur la base d'un mécanisme de transmission multi-cellules. Lors de la transmission des données de service d'émission multidestination entre les cellules selon les ressources radio déterminées, les cellules voisines doivent se limiter à utiliser les ressources radio déterminées. Le procédé permet d'améliorer la qualité de la réception pour les utilisateurs dans les zones de transition entre chacune des cellules indépendantes et les cellules qui diffusent.
PCT/CN2007/001382 2006-04-26 2007-04-25 Procédé et système de transmission d'un service d'émission multidestination WO2007131419A1 (fr)

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CN2006100781196A CN101064904B (zh) 2006-04-26 2006-04-26 广播组播业务的传输方法及其系统
CN200610078119.6 2006-04-26

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CN114258690A (zh) * 2019-08-29 2022-03-29 高通股份有限公司 使用不同广播/多播无线电承载模式递送广播服务

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WO2010050899A1 (fr) * 2008-10-28 2010-05-06 Agency For Science, Technology And Research Procédé d'optimisation d'allocation de bande passante dans un réseau de communication sans fil
CN101902690B (zh) * 2009-05-27 2016-10-05 上海贝尔股份有限公司 用于单播业务和广播组播业务集成的方法及其设备
CN101888638B (zh) * 2010-05-14 2012-11-14 北京邮电大学 基于同性质栅格分组的异构网络信息广播方法及系统

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CN114258690A (zh) * 2019-08-29 2022-03-29 高通股份有限公司 使用不同广播/多播无线电承载模式递送广播服务
CN114258690B (zh) * 2019-08-29 2023-08-18 高通股份有限公司 使用不同广播/多播无线电承载模式递送广播服务

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