WO2011018000A1 - 多播/组播单频网络子帧的ofdm符号分配方法及系统 - Google Patents

多播/组播单频网络子帧的ofdm符号分配方法及系统 Download PDF

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Publication number
WO2011018000A1
WO2011018000A1 PCT/CN2010/075632 CN2010075632W WO2011018000A1 WO 2011018000 A1 WO2011018000 A1 WO 2011018000A1 CN 2010075632 W CN2010075632 W CN 2010075632W WO 2011018000 A1 WO2011018000 A1 WO 2011018000A1
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WO
WIPO (PCT)
Prior art keywords
mbsfn
ofdm symbol
mbms service
pdcch
control signaling
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PCT/CN2010/075632
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English (en)
French (fr)
Inventor
苟伟
马子江
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP10807945.0A priority Critical patent/EP2442511B1/en
Priority to US13/386,005 priority patent/US9066317B2/en
Publication of WO2011018000A1 publication Critical patent/WO2011018000A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/30Resource management for broadcast services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/04Error control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453Resources in frequency domain, e.g. a carrier in FDMA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Definitions

  • the present invention relates to the field of Multimedia Broadcast Multicast Service (MBMS), and more particularly to an orthogonal frequency division in a Multimedia Broadcast multicast service Single Frequency Network (MB SFN).
  • MB SFN Multimedia Broadcast Multicast Multicast service Single Frequency Network
  • OFDM Orthogonal Frequency Division Multiplexing
  • the 3rd Generation Partnership Project (3GPP) proposed the MBMS service, which is a technology for transmitting data from one data source to multiple targets, and implements the network (including The sharing of resources between the core network and the access network improves the utilization of network resources (especially air interface resources).
  • the MBMS service defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service broadcast and multicast, thus providing a variety of rich video, audio and multimedia services, which undoubtedly conforms.
  • the trend of future mobile data development provides a better business prospect for the development of 3G.
  • a multicast/multicast single-frequency network (MBSFN) sub-frame transmits MBMS services, but not all MBSFN subframes are used to transmit MBMS services. For example, some MBSFN subframes are also used for positioning services, relay services, and the like. It should be noted that in LTE Release 8/9, only the MBMS service of the multi-cell transmission is considered, and the MBMS service of the single-cell transmission is not considered, and the MBMS of the current multi-cell mode is currently considered. The service must use the MBSFN subframe for bearer transmission, and the MBMS service in the single cell mode may use the MBSFN subframe for bearer transmission. For the specific definition of the multi-cell mode MBMS service, reference may be made to the 36.331 protocol, and the basic feature is that the MCH (Multicast Channel) bearer is transmitted or transmitted through the Physical Multicast Channel (PMCH).
  • MCH Multicast Channel
  • LTE specifies that a two-level method is used to configure radio frames and subframes that carry MBMS services. The details are as follows:
  • the first level implements the radio frame configuration carrying MBMS, which satisfies the following equation:
  • radioFrameAllocationPeriod radioFrameAllocationOffset
  • SFN System Frame Number
  • radioFrameAllocationPeriod indicates the MBSFN radio frame period, which can take ⁇ 1, 2, 4, 8 Any value of 16, 32 ⁇
  • radioFrameAllocationOffset represents the offset of the MBSFN radio frame, which is smaller than the value of the selected MBSFN radio frame period and greater than or equal to 0
  • mod indicates that the SFN modulo or seeks the radioFrameAllocationPeriod I.
  • the above-mentioned radio frame configured to carry MBMS services is called an MBSFN radio frame.
  • the second stage implements the configuration of the subframe in which the MBSF service is carried in the MBSFN radio frame, and generally uses a bitmap image method.
  • subframes #0, #4, #5, and #9 in frequency division duplex (FDD) mode cannot carry MBMS services
  • subframes #0, #1, #5, # in time division duplex (TDD) mode 6 can not carry MBMS services, so use 6-bit bitmap to describe which of the remaining 6 subframes carry MBMS services, each MBSFN radio intraframe bearer
  • the subframe configuration of the MBMS service is the same.
  • the subframe configuration in the MBSFN radio frame in each BCCH modification period cannot be changed.
  • the subframe in which the MBMS service is carried in the MBSFN radio frame is referred to as an MBSFN subframe, which is also referred to as a multicast subframe.
  • the MBSFN subframe used to carry the MBMS service uses an extended cyclic prefix.
  • the MBSFN subframe has 12 OFDM symbols, and the first or 2 OFDM symbols are used to transmit Unicast services.
  • the control information also referred to as the Physical Downlink Control Channel (PDCCH)
  • PDCCH Physical Downlink Control Channel
  • the scheduling and sending of the MBMS service is a semi-static scheduling mode.
  • the MBMS service in the period is realized by a scheduling period. In this way, for the MBMS service, the configuration is performed once in a cycle, that is, at the beginning of each scheduling period, the system side needs to allocate the resources of the scheduling period for transmitting the MBMS service, and which specific MBMS is to be sent on which resources.
  • the services are all configured by each cell in the MBSFN area.
  • the second OFDM symbol in the MBSFN subframe has a similar problem, that is, the second OFDM symbol of the subframe has a potentially unpredictable risk for transmitting the MBMS service, and the specific analysis is as follows:
  • the MBMS service in the multi-cell mode is characterized in that the MBSFN combining mode is used to perform air interface merging on the data of the same MBMS service sent from each cell in the MBSFN area. .
  • the cell mode MBMS service transmission must meet the following conditions.
  • the electromagnetic waves transmitted by the respective cells participating in the MBMS service in the MBSFN area to transmit the MBMS data should be identical, so that the electromagnetic wave signals from different cells can be naturally superimposed in the air. Enhance the performance of the signal. Specifically, data of the same format is transmitted by using the same frequency resource and the same time resource.
  • the number of OFDM symbols occupied by the PDCCH of each cell is analyzed.
  • the number of OFDM symbols occupied by the PDCCH of each cell is determined by the cell itself, for example, according to the number of user terminals of the cell or the characteristics of the user terminal (for example, a terminal of multiple antennas).
  • each cell determines the number of OFDM symbols used by the PDCCH of the current cell according to the number of users that need to be scheduled in the cell at this time. That is, when the number of users to be scheduled in the cell is large, the PDCCH uses the first two OFDM symbols, and the cell When the number of users to be scheduled is small, the PDCCH uses the first OFDM symbol, and the PDCCH does not use the second OFDM symbol.
  • the second OFDM symbol may be occupied by the PDCCH, and whether the PDCCH is occupied by the PDCCH is mainly determined by the cell itself.
  • the PDCCH of some cells occupies the first and second OFDM symbols of the MBSFN subframe, and some The PDCCH of the cell occupies only the first OFDM symbol of the MBSFN subframe.
  • the PDCCHs of all cells in the area occupy the first and second OFDM symbols, or the PDCCHs of all the cells occupy only the first OFDM symbol. 1 OFDM symbol.
  • the second OFDM symbol of the MBSFN subframe can be used to transmit the MBMS service, but the probability is very small.
  • FIG. 1 is a schematic diagram of an example of multiple cells in an MBSFN area.
  • the number of users that need to be scheduled in the cell 1 and the cell 2 is compared. If more, the PDCCHs of cell 1 and cell 2 will be used.
  • the first 2 OFDM symbols, and the PDCCHs of other cells in the area use only the 1st OFDM symbol.
  • the second OFDM symbol is not a shared resource of multiple cells in the MBSFN area, and the cell in the MBSFN area cannot use the second OFDM symbol to send the MBMS service, thereby causing system resource waste; if it is forced to be used,
  • the multi-cell MBMS service has the gain of the air interface superposition, so it will be sent because the majority of the cells are transmitted in the 2nd OFDM symbol.
  • the MBMS data causes strong interference to the PDCCH information transmitted by the second OFDM symbol in a few cells (such as cell 1 and cell 2), and the PDCCH of these cells cannot be normally received.
  • the main object of the present invention is to provide an OFDM symbol allocation method and system for MBSFN subframes, which can effectively utilize resources and can avoid interference of MBMS data transmission to PDCCH to some extent.
  • An orthogonal frequency division multiplexing OFDM symbol allocation method for a multicast/multicast single frequency network MBSFN subframe includes: OFDM symbol allocation system according to a unified configuration rule, carrying a multi-cell mode multimedia broadcast multicast MBMS in an MBSFN area The OFDM symbols in all MBSFN subframes transmitted by the service are allocated.
  • the configuration rule is: performing unified segmentation on the MBSFN subframes in the cells participating in the MBMS service in the MBSFN area, and performing OFDM symbols on the physical downlink control channel PDCCH of the MBSFN subframe in each segment. Unified configuration.
  • the OFDM symbols in all the MBSFN subframes that are sent by the MBMS service are allocated according to the unified configuration rule: the respective cells configure the OFDM symbol according to the configuration rule for the PDCCH, and the MBSFN subframe is configured.
  • the corresponding OFDM symbol is allocated to the PDCCH, and the remaining OFDM symbols in the MBSFN subframe are allocated to the MBMS service.
  • the segmenting the MBSFN subframe is: according to an MBMS service dynamic scheduling period, or a multicast control channel MCCH modification period, or a broadcast control channel BCCH modification period, Or the finite number of consecutive MBSFN radio frames, or a limited number of consecutive MBSFN subframes, to segment the MBSFN subframe.
  • the PDCCHs of all the MBSFN subframes in the MBSFN area are uniformly configured in the same manner in each segment of the MBSFN area, that is, the OFDM symbols in each of the cells in the MBSFN area are the same.
  • the PDCCH of all MBSFN subframes of the MBMS service occupies the first OFDM symbol, or the first two OFDM symbols.
  • the PDCCHs of the PDCCHs of all the MBSFN subframes in the MBSFN area are different in each segment of the MBSFN area, that is, the OFDM symbols in each of the cells in the MBSFN area are different.
  • the PDCCH of a part of the MBSFN subframes of all the MBSFN subframes of the MBMS service occupies the first OFDM symbol, and the PDCCH of the remaining MBSFN subframe occupies the first two OFDM symbols.
  • the OFDM symbol allocation system includes: a base station to which all cells carrying MBMS services in the MBSFN area belong, and a superior node of the base station,
  • the OFDM symbol allocation system allocates, according to a unified configuration rule, OFDM symbols in all MBSFN subframes transmitted in the MBSFN area carrying the multi-cell mode multimedia broadcast multicast MBMS service:
  • the base station to which the cell carrying the MBMS service belongs in the MBSFN area receives a configuration rule of the PDCCH configuration PDCCH from the upper-level node for all MBSFN subframes carrying the multi-cell mode MBMS service in the MBSFN area;
  • the base station generates, according to the received configuration rule, control signaling of the PDCCH occupying the OFDM symbol in the corresponding MBSFN subframe, and configuring the MBSFN subframe according to the control signaling;
  • the base station sends the generated control signaling to the terminal.
  • the OFDM symbol allocation system includes: a base station to which all cells carrying MBMS services in the MBSFN area belong, and an upper node of the base station, The OFDM symbol allocation system allocates, according to a unified configuration rule, OFDM symbols in all MBSFN subframes that are transmitted by the multi-cell mode multimedia broadcast multicast MBMS service in the MBSFN area as:
  • the upper node of the base station to which the cell carrying the MBMS service belongs in the MBSFN area generates control signaling of the PDCCH occupying OFDM symbol in the MBSFN subframe according to a unified configuration rule;
  • the upper node of the base station sends the generated control signaling to the base station to which all the cells carrying the MBMS service belong;
  • the base station After receiving the control signaling from the upper node, the base station configures the MBSFN subframe according to the control signaling, and forwards the control signaling to the terminal.
  • the OFDM symbol allocation system is a base station to which all cells in the MBSFN area that carry the MBMS service belong.
  • the OFDM symbol allocation system allocates, according to a unified configuration rule, OFDM symbols in all MBSFN subframes transmitted in the MBSFN area carrying the multi-cell mode multimedia broadcast multicast MBMS service:
  • the base station to which the cell carrying the MBMS service belongs in the MBSFN area configures an OFDM symbol configuration rule for all PDCCHs in all MBSFN subframes.
  • the base station generates corresponding MBSFN sub-subjects according to the configuration rule.
  • the PDCCH in the frame occupies control signaling of the OFDM symbol, and configures the MBSFN subframe according to the control signaling;
  • the base station sends the generated control signaling to the terminal.
  • An OFDM symbol allocation system for an MBSFN subframe comprising: a configuration rule providing unit, a control signaling generating unit, and a control signaling sending unit, where
  • the configuration rule providing unit is configured to provide a unified configuration rule
  • the control signaling generating unit is configured to provide a configuration rule provided by the unit according to the configuration rule, Generating control signaling of the PDCCH occupying the OFDM symbol in the corresponding MBSFN subframe, and configuring the MBSFN subframe according to the control signaling;
  • the control signaling sending unit is configured to send control signaling generated by the control signaling generating unit to the terminal.
  • the configuration rule providing unit is located on a superior node of a base station to which all cells carrying the MBMS service belong in the MBSFN area;
  • the control signaling generating unit and the control signaling sending unit are located on a base station to which the cell carrying the MBMS service belongs in the MBSFN area.
  • the configuration rule providing unit and the control signaling generating unit are located on the upper node of the base station to which all the cells carrying the MBMS service belong in the MBSFN area;
  • the control signaling sending unit is located at a base station to which the cell carrying the MBMS service belongs in the MBSFN area and an upper node of the base station.
  • the configuration rule providing unit, the control signaling generating unit, and the control signaling sending unit are all located on a base station to which the cell carrying the MBMS service belongs in the MBSFN area.
  • the configuration rule provided by the configuration rule providing unit is: performing unified segmentation on the MBSFN subframes in each cell participating in the MBMS service in the MBSFN area, and physical downlink control channels of MBSFN subframes in each segment
  • the OFDM symbols occupied by the PDCCH are uniformly configured.
  • the control signaling generating unit configures the MBSFN subframe to: allocate a corresponding OFDM symbol in the MBSFN subframe to the PDCCH according to the configuration rule that the PDCCH is configured for the PDCCH, and allocate the remaining OFDM in the MBSFN subframe Symbols are assigned to the MBMS service.
  • the configuration rule providing unit segments the MBSFN subframe into: according to an MBMS service dynamic scheduling period, or a multicast control channel MCCH modification period, or a broadcast control channel BCCH modification period, or a limited number of consecutive MBSFN radio frames, Or a limited number of consecutive MBSFN subframes segment the MBSFN subframe.
  • the OFDM symbols occupied by the PDCCH of the MBSFN subframe in each segment are uniformly configured in the configuration rule provided by the configuration rule providing unit: the PDCCH symbols occupied by the PDCCHs of all the MBSFN subframes carrying the MBMS service in the segment are the same, that is, The PDCCH carrying all the MBSFN subframes of the MBMS service in each segment of each cell in the MBSFN area occupies the first OFDM symbol, or the first two OFDM symbols.
  • the OFDM symbol allocation method and system for the MBSFN subframe of the present invention by configuring the OFDM symbol occupied by the PDCCH in the MBSFN subframe of the MBMS service carrying the multi-cell mode, thereby improving the MBMS service of the OFDM symbol that may be occupied by the PDCCH in the MBSFN subframe. Frequency, so that the resources are effectively utilized; and, after the OFDM symbol occupied by the PDCCH is specified, the PDCCH information and the MBMS data of the same location in the MBSFN subframe are not transmitted in different cells, so that the PDCCH information and the MBMS data are separately transmitted, thereby being able to Avoid interference of PDCCH on MBMS data transmission.
  • 1 is a schematic diagram showing an example of multiple cells in an MBSFN area
  • FIG. 2 is a schematic flowchart of an OFDM symbol allocation method of an MBSFN subframe according to the present invention, when a unified configuration rule is sent by an upper-layer node of a base station to a base station to which a cell carrying an MBMS service belongs in the MBSFN area;
  • FIG. 3 is a schematic flowchart of an OFDM symbol allocation method of an MBSFN subframe according to the present invention, when a control node sends a control signaling to a base station of a cell carrying an MBMS service in an MBSFN area according to a unified configuration rule;
  • FIG. 4 is a schematic flowchart of an OFDM symbol allocation method for an MBSFN subframe according to the present invention when a configuration rule is fixedly configured on a base station;
  • FIG. 5 is a schematic structural diagram of an OFDM symbol allocation system of an MBSFN subframe according to the present invention
  • FIG. 6 is a schematic diagram of OFDM symbol allocation in Embodiment 1 of the present invention
  • FIG. 7 is a schematic diagram of MBSFN subframe segmentation according to Embodiment 2 of the present invention
  • FIG. FIG. 8 is a schematic structural diagram of each MBSFN subframe in the first segment in Embodiment 2 of the present invention
  • FIG. 9 is a schematic structural diagram of each MBSFN subframe in the second segment in Embodiment 2 of the present invention.
  • the basic idea of the present invention is to improve the frequency of the OFDM symbol that may be occupied by the PDCCH in the MBSFN subframe by configuring the OFDM symbol occupied by the PDCCH in all MBSFN subframes of the MBMS service carrying the multi-cell mode.
  • the MBSFN subframe currently specifies that the first 2 OFDM symbols of the MBSFN subframe are available for the PDCCH, and the PDCCH uses at least one OFDM symbol.
  • the OFDM symbol that the PDCCH must be used for is the first OFDM symbol of the MBSFN subframe; the OFDM symbol that the PDCCH may use is the second OFDM symbol of the MBSFN subframe, and specifically, the number of terminals that the base station needs to schedule according to the cell. Or determining whether the PDCCH uses the first OFDM symbol or the first and second OFDM symbols according to the type of the terminal that needs to be scheduled in the cell.
  • the OFDM symbol allocation method of the MBSFN subframe of the present invention is: The OFDM symbol allocation system performs OFDM symbols in all MBSFN subframes carrying the MBMS service in a cell that carries the multi-cell mode MBMS service in the MBSFN area according to a unified configuration rule. Make an assignment.
  • the OFDM symbol allocation system carries all MBSFNs of the MBMS service in a cell that is sent in a multi-cell mode MBMS service in an MBSFN area according to a unified configuration rule.
  • the unified configuration rule may be sent by the upper node of the base station to the base station of the cell that carries the MBMS service in the MBSFN area, that is, the OFDM symbol allocation system includes: the base station to which all the cells carrying the MBMS service in the MBSFN area belong and the base station
  • the upper node of the base station is a Multi-cell/multicast Coordination Entity (MCE) in LTE.
  • MCE Multi-cell/multicast Coordination Entity
  • the OFDM symbol allocation method of the frame includes:
  • Step 21 The base station receives a configuration rule for configuring an OFDM symbol for the PDCCH from the upper node.
  • the base station described herein is a base station to which all cells carrying MBMS services belong in the MBSFN area.
  • Step 22 The base station generates, according to the received configuration rule, control signaling of the PDCCH occupying the OFDM symbol in the corresponding MBSFN subframe.
  • the base station generally needs to configure the MBSFN subframe according to control signaling.
  • Step 23 The base station sends the generated control signaling to the terminal.
  • the upper-level node of the base station may generate the control signaling of the PDCCH-occupied OFDM symbol in the MBSFN subframe to all the cells carrying the MBMS service in the MBSFN area according to the unified configuration rule.
  • the eNB is allocated to implement the OFDM symbol allocation of the MBSFN subframe.
  • the OFDM symbol allocation system also includes: a base station to which all the cells carrying the MBMS service in the MBSFN area belong, and an upper node of the base station.
  • the upper node of the base station is generally an MCE.
  • FIG. 3 is a schematic flowchart of an OFDM symbol allocation method for an MBSFN subframe according to the present invention, when the upper-layer node of the base station generates control signaling according to a unified configuration rule and sends the signal to the base station of the cell that carries the MBMS service in the MBSFN area.
  • the OFDM symbol allocation method of the MBSFN subframe at this time includes: Step 31: The upper node of the base station generates control signaling of the PDCCH occupying the OFDM symbol in the MBSFN subframe according to a unified configuration rule.
  • the base station described herein is a base station to which all cells carrying MBMS services belong in the MBSFN area.
  • Step 32 The upper node of the base station sends the generated control signaling to the base station to which all the cells carrying the MBMS service belong.
  • Step 33 After receiving the control signaling from the upper node, the base station forwards the control signaling to the terminal.
  • the base station after receiving the control signaling from the upper node, the base station generally needs to configure the MBSFN subframe according to the control signaling.
  • the configuration rule can be fixedly configured on the base station, and the base station directly acquires the configuration rule of the fixed configuration and implements the OFDM symbol allocation of the MBSFN subframe, that is, the OFDM symbol allocation system is the base station to which all the cells carrying the MBMS service in the MBSFN area belong.
  • 4 is a schematic flowchart of a method for allocating an OFDM symbol of an MBSFN subframe according to the present invention.
  • the method for allocating an OFDM symbol of an MBSFN subframe includes: Step 41: The base station acquires a fixed method. Configure a configuration rule for configuring OFDM symbols for the PDCCH.
  • the base station described herein is a base station to which all cells carrying MBMS services belong in the MBSFN area.
  • Step 42 The base station generates, according to the obtained configuration rule, control signaling of the PDCCH occupying the OFDM symbol in the corresponding MBSFN subframe.
  • the MBSFN subframe is generally configured according to the control signaling.
  • Step 43 The base station sends the generated control signaling to the terminal.
  • the unified configuration rule is generally: performing unified segmentation on MBSFN subframes in each cell participating in the MBMS service in the MBSFN area, and MBSFN subframes in each segment
  • Each cell of the OFDM symbol occupied by the PDCCH is uniformly configured.
  • the size of each segment may be: MBMS service dynamic scheduling period, or Multicast Control Channel (MCCH) modification period, or Broadcast Control Channel (BCCH) modification period, or a limited number of consecutive MBSFN radio frames, or A limited number of consecutive MBSFN subframes, and the like.
  • consecutive MBSFN radio frames described herein are not for all radio frames, for example, there are 10 radio frames, wherein the numbers 1, 3, 5, 7, and 9 are MBSFN radio frames, and the rest are For non-MBSFN radio frames, if four consecutive MBSFN radio frames are one segment, then this means that 1, 3, 5, and 7 are one segment instead of 1, 2, 3, and 4 segments. Consecutive MBSFN subframes are similar.
  • the non-MBSFN radio frame is also included in the segmentation, that is, the discontinuous MBSFN radio frame, for example, there are 10 radio frames, wherein the number is 1, 3, 5, 7, and 9 is MBSFN.
  • the rest are non-MBSFN radio frames. If four consecutive MBSFN radio frames are one segment, then this means that 1, 2, 3, and 4 are one segment.
  • Non-contiguous MBSFN subframes are similar.
  • the PDCCHs occupied by the PDCCHs of each MBSFN subframe in each segment may be the same.
  • the PDCCH of each MBSFN subframe occupies the first OFDM symbol, or the first two OFDM symbols.
  • the PDCCHs occupied by the PDCCHs of each MBSFN subframe in each segment may also be different.
  • the PDCCH of the partial MBSFN subframe in the segment occupies the first OFDM symbol, and the PDCCH of the remaining MBSFN subframes is occupied. The first 2 OFDM symbols.
  • the OFDM symbols in the MBSFN subframe that carries the MBMS service are allocated according to the unified configuration rule: the respective cells configure the OFDM symbol according to the configuration rule of the OFDM symbol for the PDCCH, and the corresponding OFDM symbol in the MBSFN subframe. Assigned to the PDCCH, the remaining OFDM symbols in the MBSFN subframe are allocated to the MBMS service.
  • the PDCCH in the MBSFN subframe uniformly uses the first OFDM symbol, or uniformly uses the first and second OFDM symbols, that is, MBSFN.
  • the intra-subframe MBMS service uniformly uses the second and subsequent OFDM symbol transmissions, or uniformly uses the third and subsequent OFDM symbol transmissions.
  • the base station may perform segmentation according to an MBMS service dynamic scheduling period, or an MCCH modification period, or a BCCH modification period, or a limited number of consecutive MBSFN radio frames, or a limited number of consecutive MBSFN subframes, thereby adjusting OFDM symbol resources used by the MBMS service. .
  • the PDCCH in the cell in which the MBMS service is transmitted in all the MBMSNs in the MBMS service dynamic scheduling period then even The number of user terminals in a cell in the MBSFN area is large, and the PDCCH of the cell does not occupy the second OFDM symbol, thereby ensuring the second OFDM symbol in the MBSFN subframe for carrying the MBMS service, that is, possibly by the PDCCH.
  • the occupied OFDM symbol can be used to transmit the MBMS data and improve the resource utilization.
  • the MBSFN sub-carriers for carrying the MBMS service are included in all the cells participating in the MBMS service transmission in an MBSFN area.
  • the first and second OFDM symbols in the frame are uniformly used by the PDCCH. Therefore, even if the number of user terminals of a cell in the MBSFN area is small, the MBMS service of the cell does not occupy the second OFDM symbol to transmit MBMS data, thereby enabling The interference of the MBMS data transmission to the PDCCH is avoided to some extent.
  • an OFDM symbol that is sometimes used by a PDCCH and sometimes not used is referred to as an OFDM symbol that may be occupied by a PDCCH.
  • the second OFDM in the MBSFN subframe satisfies the OFDM symbol that may be occupied by the PDCCH.
  • the first OFDM is definitely used because the PDCCH is used, so the OFDM symbol that may be occupied by the PDCCH is not satisfied. It is considered that it is possible to define the number of OFDM symbols occupied by the PDCCH as one (first OFDM symbol) or two (first and second OFDM symbols) or three (first, in the subsequent MBSFN subframe).
  • the OFDM symbols that may be occupied by the PDCCH in the MBSFN subframe are not limited to the second OFDM symbol.
  • 5 is a schematic structural diagram of an OFDM symbol allocation system of an MBSFN subframe according to the present invention.
  • the OFDM symbol allocation system of the MBSFN subframe of the present invention includes: a configuration rule providing unit 51, a control signaling generating unit 52, and control signaling. a transmitting unit 53, wherein
  • a configuration rule providing unit 51 configured to provide a unified configuration rule
  • the control signaling generating unit 52 is configured to generate, according to the configuration rule provided by the configuration rule providing unit, control signaling of the PDCCH occupying the OFDM symbol in the corresponding MBSFN subframe, and configure the MBSFN subframe according to the control signaling;
  • the control signaling sending unit 53 is configured to send control signaling generated by the control signaling generating unit to the terminal.
  • the configuration rule providing unit 51 is located on an upper node of a base station to which all the cells carrying the MBMS service belong in the MBSFN area; the control signaling generating unit 52 and the control signaling sending unit 53 are located in the MBSFN area.
  • the configuration rule providing unit 51 and the control signaling generating unit 51 are located on the upper node of the base station to which all the cells carrying the MBMS service belong in the MBSFN area; the control signaling sending unit 53 is located in the MBSFN area and carries the MBMS service.
  • the configuration rule providing unit 51, the control signaling generating unit 52, and the control signaling sending unit 53 are all located on the base station to which the cell carrying the MBMS service belongs in the MBSFN area.
  • the configuration rule provided by the configuration rule providing unit 51 is: performing unified segmentation on the MBSFN subframes in the respective cells participating in the MBMS service in the MBSFN area, and the physical downlink control channel PDCCH of the MBSFN subframe in each segment
  • the occupied OFDM symbols are uniformly configured.
  • the control signaling generating unit 52 configures the MBSFN subframe as: according to the configuration rule that the PDCCH is configured for the PDCCH, the corresponding OFDM symbol in the MBSFN subframe is divided into The PDCCH is allocated, and the remaining OFDM symbols in the MBSFN subframe are allocated to the MBMS service.
  • the configuration rule providing unit 51 segments the MBSFN subframe into: according to an MBMS service dynamic scheduling period, or a multicast control channel MCCH modification period, or a broadcast control channel BCCH modification period, or a limited number of consecutive MBSFN radio frames, or A limited number of consecutive MBSFN subframes segment the MBSFN subframe.
  • the OFDM symbols occupied by the PDCCH of the MBSFN subframe in each segment are uniformly configured in the configuration rule provided by the configuration rule providing unit 51: the PDCCH symbols of all the MBSFN subframes carrying the MBMS service in the segment occupy the same OFDM symbol, that is, The PDCCH of all MBSFN subframes carrying the MBMS service in each segment of each cell in the MBSFN area occupies the first OFDM symbol, or the first two OFDM symbols.
  • the configuration rule for configuring the OFDM symbol for the PDCCH is: segmenting the MBSFN subframe of each cell that carries the multi-cell mode MBMS service in the MBSFN area, and each segment includes an equal number of MBSFN subframes. It can also contain unequal number of MBSFN subframes.
  • Each segment in this embodiment is a dynamic scheduling period of the MBMS service.
  • the PDCCH, according to the set segment, such as the MBMS service dynamic scheduling period occupies the OFDM symbol that must be occupied in the MBSFN subframe, or occupies the OFDM symbol and other OFDM symbols that must be occupied in the MBSFN subframe.
  • each segment alternately occupies the first OFDM symbol of the MBSFN subframe or occupies the first two OFDM symbols.
  • the alternate occupant may be non-uniform.
  • the MBSFN subframes in consecutive segments may be configured to occupy the first OFDM symbol, or both occupy the first two OFDM symbols. OFDM symbol.
  • FIG. 6 is a schematic diagram of OFDM symbol allocation according to Embodiment 1 of the present invention.
  • N is a natural number
  • a base station The first OFDM symbol is configured for the PDCCH, and the remaining OFDM symbols (including the second OFDM symbol) in the MBSFN subframe are configured for the MBMS service; in the N+1 segments (the MBMS service dynamic scheduling period), the base station is configured before the PDCCH 2 OFDM symbols, and configure the remaining OFDM symbols in the MBSFN subframe for the MBMS service (excluding the 2nd OFDM symbol).
  • the eNB may configure the first OFDM symbol for the PDCCH and configure the remaining OFDM symbols in the MBSFN subframe for the MBMS service, in the Nth (N is a natural number) segment of the MBMS service (MBMS service dynamic scheduling period). 2nd OFDM symbol); in N+1, N+2, N+3, 3 segments (MBMS service dynamic scheduling period), the base station configures the first 2 OFDM symbols for the PDCCH, and configures the MBSFN subframe for the MBMS service. Remaining OFDM symbols (excluding the 2nd OFDM symbol).
  • the MBSFN subframes that carry the MBMS service are segmented, and the PDCCH configurations of the MBSFN subframes in each segment are the same, and the number of MBSFN subframes included in each segment may be equal or not equal (in general practical applications) Use equal).
  • how to segment, and the number of each MBSFN subframe is specified by the configuration rule and is uniformly configured in the MBSFN area, that is, the configuration rule for configuring the OFDM symbol for the PDCCH is: the number of MBSFN subframes that should be included in each segment (such as 4, but in actual application, the number of MBSFN subframes included in each segment should be fixed and fixed by the protocol, so that there is no need to notify the receiving end that each segment contains the number of MBSFN subframes, and the PDCCH in the MBSFN subframe included in each segment
  • the occupied OFDM symbols are uniformly configured, for example, the PDCCH occupies the first OFDM symbol, or is uniformly configured to occupy the first two OFDM symbols of the PDCCH.
  • FIG. 7 is a schematic diagram of MBSFN subframe segmentation according to Embodiment 2 of the present invention.
  • a plurality of MBSFN subframes in a dynamic scheduling period of an MBMS service are segmented, and each MBSFN subframe is maintained in each segment.
  • the last segment includes two MBSFN subframes.
  • the last segment cannot meet the number of MBSFN subframes that should be included in each segment indicated in the configuration rule, There are actually several MBSFN subframes, and the last segment holds several MBSFN subframes.
  • Such segmentation is not limited to segmenting the MBSFN in a certain MBMS dynamic scheduling period, but segmenting all MBSFNs in each cell in the MBSFN area.
  • the same OFDM symbol is configured, that is, the OFDM symbols carrying the MBMS service in the MBSFN subframe of each segment remain the same.
  • the configuration rule specifies that the PDCCH of the first MBSFN subframe occupies the first one. OFDM symbol, then, at this time, each MBSFN subframe structure in the first segment is as shown in FIG. 8, the PDCCH occupies the first OFDM symbol, and the MBMS service uses the remaining OFDM symbols including the second OFDM symbol. If the configuration rule specifies that the PDCCH of the second MBSFN subframe occupies the first and second OFDM symbols, then the structure of each MBSFN subframe in the second segment is as shown in FIG.
  • the MBMS service uses the remaining OFDM symbols not including the 2nd OFDM symbol, the third segment is the same as the first segment, and so on.
  • the example can be modified in some simple ways.
  • the first segment configuration PDCCH occupies 2 OFDM symbols, and the second segment configuration PDCCH occupies 1 OFDM symbol; or, the first and second segment configurations
  • the PDCCH occupies 1 OFDM symbol, and the PDCCH of the third and fourth segments occupies 2 OFDM symbols, and the configuration of each of the two segments is the same; or the PDCCH of the first segment occupies 1 OFDM symbol, and the PDCCH of the second, third, and fourth segments occupies 2
  • N mod 4 ⁇ 1 the PDCCH is configured to occupy 2 OFDM symbols.
  • Embodiment 3 Frames are segmented because the MBSFN radio frame is segmented, which is actually a MBSFN subframe. Segmentation).
  • the number of MBSFN radio frames included in each segment may be equal or unequal (usually equal in practical applications).
  • All MBSFN radio frames in a dynamic scheduling period of an MBMS service may be segmented, or MBSFN radio frames of each cell in the MBSFN area may be segmented, not limited to one MBMS service scheduling period, and may be dynamically scheduled across MBMS services. .
  • an MBMS service dynamic scheduling period segmentation is performed, and multiple MBMS service dynamic scheduling periods are not performed, that is, one or more MBSFN radio frames carrying MBMS services are used as one segment in an MBMS service dynamic scheduling period.
  • the PDCCHs of the MBSFN subframes carrying the MBMS service in each segment occupy the same OFDM symbol configuration, and each segment may include an equal number of MBSFN subframes, and may also include an unequal number of MBSFN subframes, that is, OFDM is configured for the PDCCH.
  • the configuration rules of the symbols are as follows:
  • the number of MBSFN radio frames included in each segment (but in actual application, the number of MBSFN subframes included in each segment should be fixed and fixed by protocol, so that there is no need to notify the receiving end that each segment contains MBSFN radio frames.
  • the OFDM symbol occupied by the PDCCH in the MBSFN subframe included in each segment is uniformly configured, for example, the PDCCH occupies the first OFDM symbol, or is uniformly configured to occupy the first two OFDM symbols of the PDCCH.
  • each segment includes one MBSFN radio frame
  • the PDCCH symbols of the PDCCH configuration of the MBSFN subframes of the MBMS service in each MBSFN radio frame are the same, That is to say, the OFDM symbols carrying the MBMS service in the MBSFN subframe of each segment remain the same.
  • the second OFDM symbol is used to carry the MBMS service in the MBSFN area.
  • the number of OFDM symbols equal to the PDCCH of the MBSFN subframe configuration in the segment of the following formula is satisfied.
  • N mod M 1 and N mod M ⁇ 1 , where N is the segment number and is a natural number.
  • the PDCCH of the MBSFN subframe in the MBSFN radio frame is configured with the first two OFDM symbols. This is an unbalanced configuration, mainly because the probability of configuring the first two OFDM symbols according to the PDCCH of the current protocol MBSFN subframe is large, so the PDCCH of more MBSFN subframes is configured with 2 OFDM symbols.
  • each segment includes 3 MBSFN radio frames, then, in a plurality of MBSFN radio frames within one MBMS service dynamic scheduling period, PDCCHs configured for PDCCHs of MBSFN subframes carrying MBMS services in every 3 MBSFN radio frames
  • the symbols are the same, that is, the OFDM symbols carrying the MBMS service in the MBSFN subframe of each segment remain the same.
  • the first OFDM symbol is configured in the PDCCH of the MBSFN subframe carrying the MBMS service
  • the second OFDM symbol is used to carry the MBMS service in the MBSFN area.
  • each segment includes 4 MBSFN radio frames
  • each 4 MBSFN radio frames is a segment
  • 1 MBSFN radio frame has 1 MBSFN radio.
  • the OFDM symbol of the PDCCH configuration of the MBSFN subframe carrying the MBMS service in the other three MBSFN radio frames is different, for example, the fourth MBSFN radio frame is different from the first three MBSFN radio frames, and the MBSFN in the first three MBSFN radio frames.
  • the PDCCH of the subframe occupies 2 OFDM symbols, and the PDCCH of the MBSFN subframe in the 4th MBSFN radio frame occupies 1 OFDM symbol.
  • each segment maintains the same configuration.
  • the PDCCH of the MBSFN subframe carrying the MBMS service can be used.
  • the second OFDM symbol is used to carry the MBMS service in the MBSFN area.
  • the segmentation described in the embodiment may further be that one MCCH modification period is one segment, or one BCCH modification period is one segment.
  • the present invention may segment an MBMS service dynamic scheduling period, or an MCCH modification period, or an MBSFN subframe within a BCCH modification period, or may not be limited to one MBMS service dynamic scheduling period, or an MCCH modification period, or a BCCH.
  • the MBSFN subframe in the modification period is segmented, that is, the segment can span the MBMS service dynamic scheduling period, or the MCCH modification period, or the BCCH modification period.
  • the operations within the segments are as in the above embodiments.

Abstract

本发明公开了一种多播/组播单频网络(MBSFN) 子帧的正交频分复用(OFDM)符号分配方法,OFDM符号分配系统按照统一的配置规则,对MBSFN区域内承载多小区模式多媒体广播多播MBMS业务发送的所有MBSFN子帧中的OFDM符号进行分配。本发明还相应地公开了一种MBSFN子帧的OFDM符号分配系统。本发明通过配置承载多小区模式的MBMS业务的MBSFN子帧中,PDCCH占用的OFDM符号, 提高了MBSFN子帧中可能被PDCCH占用的OFDM符号承载MBMS业务的频率, 从而有效利用资源;并且能够在一定程度上避免MBMS数据传输对PDCCH的干扰。

Description

多播 /组播单频网络子帧的 OFDM符号分配方法及系统 技术领域
本发明涉及多媒体广播多播业务 ( Multimedia Broadcast Multicast Service , MBMS ) 领域, 尤其涉及一种多播 /组播单频网络 ( Multimedia Broadcast multicast service Single Frequency Network , MB SFN )子中贞的正交 频分复用 ( Orthogonal Frequency Division Multiplexing, OFDM )符号分西己 方法及系统。 背景技术
随着英特网的迅猛发展和大屏幕多功能手机的普及, 出现了大量移动 数据多媒体业务和各种高带宽多媒体业务, 例如视频会议、 电视广播、 视 频点播、 广告、 网上教育、 互动游戏等, 这一方面满足了移动用户不断上 升的业务需求, 同时也为移动运营商带来新的业务增长点。 这些移动数据 多媒体业务要求多个用户能够同时接收相同数据, 与一般的数据业务相比, 具有数据量大、 持续时间长、 时延敏感等特点。
为了有效地利用移动网络资源, 第三代合作伙伴计划(3rd Generation Partnership Project, 3GPP )提出了 MBMS业务, 该业务是一种从一个数据 源向多个目标传送数据的技术, 实现了网络(包括核心网和接入网) 资源 的共享, 提高了网络资源 (尤其是空中接口资源)的利用率。 3GPP定义的 MBMS业务不仅能够实现纯文本低速率的消息类组播和广播, 而且还能够 实现高速多媒体业务的广播和组播, 从而提供多种丰富的视频、 音频和多 媒体业务, 这无疑顺应了未来移动数据发展的趋势, 为 3G的发展提供了更 好的业务前景。
在长期演进系统( Long Term Evolution, LTE ) Release 8/9中规定使用 多播 /组播单频网络(MBSFN )子帧传输 MBMS业务, 但是并不是所有的 MBSFN子帧都用来传输 MBMS业务, 例如, 有些 MBSFN子帧也用于定 位业务、 relay业务等。 需要说明的是, 在 LTE Release 8/9中目前只考虑多 小区模式 (Multi-cell transmission ) 的 MBMS 业务, 不考虑单小区模式 ( Single-cell transmission )的 MBMS业务, 而目前多小区模式的 MBMS业 务肯定使用 MBSFN子帧进行承载发送, 单小区模式的 MBMS业务则可能 使用 MBSFN子帧进行承载发送。 其中, 多小区模式 MBMS业务具体定义 可以参考 36.331协议,其基本特点是通过物理信道 PMCH( Physical Multicast Channel, 物理多播信道)发送或传输信道 MCH ( Multicast Channel, 多播 信道)承载。
目前 LTE中规定,使用两级制方法来配置承载 MBMS业务的无线帧和 子帧, 具体描述如下:
第一级实现承载 MBMS的无线帧配置, 满足下面的等式:
SFN mod radioFrameAllocationPeriod = radioFrameAllocationOffset 其中, SFN ( System Frame Number ) 为系统帧号的缩写, 即系统的无 线帧编号,从 0到 1023 ; radioFrameAllocationPeriod表示 MBSFN无线帧周 期,其可以取 {1 , 2 , 4, 8 , 16, 32}中任意一个值; radioFrameAllocationOffset 表示 MBSFN无线帧的偏移,其取值为小于选定的 MBSFN无线帧周期的数 值, 且大于等于 0的整数; mod表示 SFN对 radioFrameAllocationPeriod取 模或者求余。 上述的被配置为承载 MBMS业务的无线帧称为 MBSFN无线 帧。
第二级实现 MBSFN无线帧内承载 MBMS业务的子帧的配置, 一般使 用位图图像(bitmap ) 的方法。 由于 LTE 中规定, 频分双工 (FDD )模式 下子帧 #0、 #4、 #5、 #9不能承载 MBMS业务, 时分双工(TDD )模式下子 帧 #0、 #1、 #5、 #6不能承载 MBMS业务, 所以, 使用 6比特的 bitmap描 述剩余的 6个子帧中哪些承载 MBMS业务, 每个 MBSFN无线帧内承载 MBMS 业务的子帧配置相同。 由于两级制配置信令在广播控制信道 ( Broadcast Control Channel, BCCH )上发送给终端, 所以在每个 BCCH修 改周期内的 MBSFN无线帧内的子帧配置不能发生变化。上述的 MBSFN无 线帧内承载 MBMS业务的子帧称为 MBSFN子帧, 也称为多播子帧。
用来承载 MBMS 业务的 MBSFN 子帧使用扩展循环前缀(Extended cyclic prefix ), 这类 MBSFN子帧中共有 12个 OFDM符号, 其中前 1个或 者 2个 OFDM符号用于传输单播(Unicast )业务的控制信息, 也称为物理 下行控制信道(Physical Downlink Control Channel, PDCCH ), 该类子帧内 剩余的资源用来发送 MBMS业务, 目前 LTE R9中, MBMS业务的调度发 送是半静态的调度方式, 通过调度周期来实现该周期内的 MBMS业务。 这 样, 对于 MBMS业务的是一个周期进行一次配置, 即在每个调度周期开始 时, 系统侧就需要分配好这个调度周期用于发送 MBMS业务的资源, 以及 即将在哪些资源上发送哪些具体的 MBMS业务, 都是由 MBSFN区域内每 个小区统一配置的。
总的来说, 一个 MBSFN区域内要发送 MBMS业务是需要每个参与发 送的小区都能够提供相同的空闲资源, 在这个相同的资源上发送 MBMS业 务, 如果 MBSFN区域中的任一小区 A不能提供该相同的资源, 那么则整 个 MBSFN区域内不能在该资源上发送 MBMS业务, 或者, 在此情况下发 送 MBMS业务, 则会影响小区 A在该资源上发送的其他业务的性能。 本发 明中, MBSFN子帧中的第 2个 OFDM符号正好存在类似问题, 即该类子 帧的第 2个 OFDM符号存在潜在的不能艮好的用来发送 MBMS业务的风 险, 具体分析如下:
首先, 给出多小区模式的 MBMS业务的特点及其传输的必须条件: 多 小区模式的 MBMS业务特点是使用 MBSFN合并方式, 对来自 MBSFN区 域内每个小区发送的同一 MBMS业务的数据进行空口合并。 有鉴于此, 多 小区模式的 MBMS业务发送必须满足以下条件, 简言之, 就是 MBSFN区 域内参与发送 MBMS业务的各个小区发送 MBMS数据的电磁波应当完全 相同, 以便于来自不同小区的电磁波信号能够在空中自然叠加, 以增强信 号的性能。 具体通过使用相同的频率资源和相同的时间资源来发送相同格 式的数据。
其次, 分析每个小区的 PDCCH占用的 OFDM符号数情况。 简言之, 每个小区的 PDCCH占用的 OFDM符号数情况由小区自身决定的, 例如, 根据小区的用户终端数或者用户终端的特点(例如多天线的终端)来决定。 例如, 每个小区根据自己小区内此时需要调度的用户数, 决定本小区 PDCCH使用的 OFDM 符号数, 即当本小区需要调度的用户数较多时, PDCCH使用前 2 个 OFDM符号, 当本小区需要调度的用户数较少时, PDCCH使用前 1个 OFDM符号,此时 PDCCH不使用第 2个 OFDM符号。 具体的, 第 2个 OFDM符号有可能被 PDCCH占用, 是否被 PDCCH占用 主要由小区自身决定, 如此, 在一个 MBSFN区域内, 一些小区的 PDCCH 占用 MBSFN子帧的第 1、 2个 OFDM符号, 一些小区的 PDCCH仅占用 MBSFN子帧的第 1个 OFDM符号。 随着 MBSFN区域内小区数目越多, 在该 MBSFN区域内就很难找到某一 MBSFN子帧时刻,该区域内所有小区 的 PDCCH占用第 1、 2个 OFDM符号, 或者所有小区的 PDCCH仅占用第 1个 OFDM符号。 当所有小区的 PDCCH仅占用第 1个 OFDM符号时, 此 MBSFN子帧的第 2个 OFDM符号才可以用来传输 MBMS业务, 但是这样 的概率非常小。
给出一种场景, 说明第 2个 OFDM符号潜在不能很好地发送 MBMS 业务。 例如, 图 1 为 MBSFN区域内具有多个小区的实例示意图, 如图 1 所示, 如果图中 MBSFN区域内的小区均参与 MBMS业务的发送, 且小区 1和小区 2内需要调度的用户数较多, 则小区 1和小区 2的 PDCCH会使用 前 2个 OFDM符号, 而该区域内其他小区的 PDCCH仅使用第 1个 OFDM 符号。那么, 第 2个 OFDM符号不是 MBSFN区域内多个小区的共有资源, 该 MBSFN区域内的小区无法使用第 2个 OFDM符号发送 MBMS业务,从 而会造成系统资源浪费; 如果非要强行使用, 则由于多小区的 MBMS业务 有空口叠加的增益, 所以会由于大部分小区在第 2 个 OFDM 符号发送
MBMS数据, 对少数几个小区 (如小区 1和小区 2 )在第 2个 OFDM符号 发送的 PDCCH信息造成强烈干扰,导致这些小区的 PDCCH不能正常接收。 发明内容
有鉴于此, 本发明的主要目的在于提供一种 MBSFN子帧的 OFDM符 号分配方法及系统, 能够有效利用资源, 且能够一定程度上避免 MBMS数 据传输对 PDCCH的干扰。
为达到上述目的, 本发明的技术方案是这样实现的:
一种多播 /组播单频网络 MBSFN子帧的正交频分复用 OFDM符号分配 方法, 包括: OFDM符号分配系统按照统一的配置规则, 对 MBSFN区域 内承载多小区模式多媒体广播多播 MBMS业务发送的所有 MBSFN子帧中 的 OFDM符号进行分配。
所述配置规则为: 对所述 MBSFN区域内的参与所述 MBMS业务的各 个小区中的所述 MBSFN子帧进行统一分段,每一段内 MBSFN子帧的物理 下行控制信道 PDCCH占用的 OFDM符号进行统一配置。
所述按照统一的配置规则,对承载所述 MBMS业务发送的所有 MBSFN 子帧中的 OFDM符号进行分配为: 所述各个小区根据所述为 PDCCH配置 OFDM符号的配置规则, 将所述 MBSFN子帧中相应的 OFDM符号分配给 PDCCH, 将 MBSFN子帧中剩余的 OFDM符号分配给 MBMS业务。
所述对所述 MBSFN子帧进行分段为:根据 MBMS业务动态调度周期、 或者多播控制信道 MCCH修改周期、 或者广播控制信道 BCCH修改周期、 或者有限个连续的 MBSFN无线帧、或者有限个连续的 MBSFN子帧对所述 MBSFN子帧进行分段。
所述 MBSFN 区域内各小区每一段内进行统一配置为: 段内承载所述 MBMS业务的所有 MBSFN子帧的 PDCCH占用的 OFDM符号相同, 即所 述 MBSFN 区域内每个小区中每一段内承载所述 MBMS 业务的所有 MBSFN子帧的 PDCCH占用第 1个 OFDM符号,或者前 2个 OFDM符号。
所述 MBSFN 区域内各小区每一段内进行统一配置为: 段内承载所述 MBMS业务的所有 MBSFN子帧的 PDCCH占用的 OFDM符号不同, 即所 述 MBSFN 区域内每个小区中每一段内承载所述 MBMS 业务的所有 MBSFN子帧中部分 MBSFN子帧的 PDCCH占用第 1个 OFDM符号 ,剩余 MBSFN子帧的 PDCCH占用前 2个 OFDM符号。
所述 OFDM符号分配系统包括: 所述 MBSFN区域内所有承载 MBMS 业务的小区所属的基站和所述基站的上级节点,
所述 OFDM符号分配系统按照统一的配置规则, 对 MBSFN区域内承 载多小区模式多媒体广播多播 MBMS 业务发送的所有 MBSFN 子帧中的 OFDM符号进行分配为:
所述 MBSFN区域内所有承载所述 MBMS业务的小区所属的基站接收 来自上级节点的为所述 MBSFN区域内承载多小区模式 MBMS业务的所有 MBSFN子帧的 PDCCH配置 OFDM符号的配置规则;
所述基站根据接收到的配置规则, 生成相应的所述 MBSFN子帧中的 PDCCH占用 OFDM符号的控制信令,并按照控制信令配置所述 MBSFN子 帧;
所述基站将生成的控制信令发送至终端。
所述 OFDM符号分配系统包括: 所述 MBSFN区域内所有承载 MBMS 业务的小区所属的基站和所述基站的上级节点, 所述 OFDM符号分配系统按照统一的配置规则 , 对 MBSFN区域内承 载多小区模式多媒体广播多播 MBMS 业务发送的所有 MBSFN 子帧中的 OFDM符号进行分配为:
所述 MBSFN区域内所有承载所述 MBMS业务的小区所属的基站的上 级节点按照统一的配置规则,生成相应的所述 MBSFN子帧中的 PDCCH占 用 OFDM符号的控制信令;
所述基站的上级节点将生成的控制信令发送至所有承载所述 MBMS业 务的小区所属的基站;
所述基站收到来自上级节点的所述控制信令后, 按照控制信令配置所述 MBSFN子帧, 并将所述控制信令转发至终端。
所述 OFDM符号分配系统为所述 MBSFN区域内所有承载所述 MBMS 业务的小区所属的基站,
所述 OFDM符号分配系统按照统一的配置规则, 对 MBSFN区域内承 载多小区模式多媒体广播多播 MBMS 业务发送的所有 MBSFN 子帧中的 OFDM符号进行分配为:
所述 MBSFN区域内所有承载所述 MBMS业务的小区所属的基站按照 固定的为所有 MBSFN子帧中的 PDCCH配置 OFDM符号的配置规则; 所述基站根据所述的配置规则, 生成相应的所有 MBSFN 子帧中的 PDCCH占用 OFDM符号的控制信令,并按照控制信令配置所述 MBSFN子 帧;
所述基站将生成的控制信令发送至终端。
一种 MBSFN子帧的 OFDM符号分配系统, 包括: 配置规则提供单元、 控制信令生成单元和控制信令发送单元, 其中,
所述配置规则提供单元, 用于提供统一的配置规则;
所述控制信令生成单元, 用于根据配置规则提供单元提供的配置规则, 生成相应的 MBSFN子帧中的 PDCCH占用 OFDM符号的控制信令, 并按 照控制信令配置所述 MBSFN子帧;
所述控制信令发送单元, 用于将控制信令生成单元生成的控制信令发 送至终端。
所述配置规则提供单元, 位于 MBSFN区域内所有承载 MBMS业务的 小区所属的基站的上级节点上;
所述控制信令生成单元和控制信令发送单元,位于 MBSFN区域内承载 MBMS业务的小区所属的基站上。
所述配置规则提供单元和控制信令生成单元,位于 MBSFN区域内所有 承载 MBMS业务的小区所属的基站的上级节点上;
所述控制信令发送单元, 位于 MBSFN区域内承载 MBMS业务的小区 所属的基站和所述基站的上级节点上。
所述配置规则提供单元、 控制信令生成单元和控制信令发送单元, 均 位于 MBSFN区域内承载 MBMS业务的小区所属的基站上。
所述配置规则提供单元提供的配置规则为:对所述 MBSFN区域内的参 与所述 MBMS业务的各个小区中的所述 MBSFN子帧进行统一分段, 每一 段内 MBSFN子帧的物理下行控制信道 PDCCH占用的 OFDM符号进行统 一配置。
所述控制信令生成单元配置所述 MBSFN子帧为: 根据所述为 PDCCH 配置 OFDM符号的配置规则,将所述 MBSFN子帧中相应的 OFDM符号分 配给 PDCCH, 将 MBSFN子帧中剩余的 OFDM符号分配给 MBMS业务。
所述配置规则提供单元对所述 MBSFN子帧进行分段为: 根据 MBMS 业务动态调度周期、 或者多播控制信道 MCCH修改周期、 或者广播控制信 道 BCCH修改周期、 或者有限个连续的 MBSFN无线帧、 或者有限个连续 的 MBSFN子帧对所述 MBSFN子帧进行分段。 所述配置规则提供单元提供的配置规则中对每一段内 MBSFN子帧的 PDCCH占用的 OFDM符号进行统一配置为: 段内承载所述 MBMS业务的 所有 MBSFN子帧的 PDCCH占用的 OFDM符号相同, 即所述 MBSFN区 域内每个小区中每一段内承载所述 MBMS 业务的所有 MBSFN 子帧的 PDCCH占用第 1个 OFDM符号, 或者前 2个 OFDM符号。
本发明 MBSFN子帧的 OFDM符号分配方法及系统, 通过配置 载多 小区模式的 MBMS业务的 MBSFN子帧中, PDCCH占用的 OFDM符号, 从而提高 MBSFN子帧中可能被 PDCCH占用的 OFDM符号承载 MBMS业 务的频率, 从而有效利用资源; 并且, 指定 PDCCH占用的 OFDM符号后, 不会出现不同小区釆用 MBSFN 子帧中相同位置的 OFDM符号分别发送 PDCCH信息和 MBMS数据的情况,从而能够在一定程度上避免 MBMS数 据传输对 PDCCH的干扰。 附图说明
图 1为 MBSFN区域内具有多个小区的实例示意图;
图 2为基站的上级节点向 MBSFN区域内所有承载 MBMS业务的小区 所属的基站发送统一的配置规则时, 本发明 MBSFN子帧的 OFDM符号分 配方法流程示意图;
图 3 为基站的上级节点按照统一的配置规则, 生成控制信令发送至 MBSFN区域内所有承载 MBMS业务的小区所属的基站时,本发明 MBSFN 子帧的 OFDM符号分配方法流程示意图;
图 4为配置规则固定配置在基站上时, 本发明 MBSFN子帧的 OFDM 符号分配方法流程示意图;
图 5为本发明 MBSFN子帧的 OFDM符号分配系统结构示意图; 图 6为本发明实施例 1中 OFDM符号分配示意图;
图 7为本发明实施例 2中 MBSFN子帧分段示意图; 图 8为本发明实施例 2中第一段内每个 MBSFN子帧结构示意图; 图 9为本发明实施例 2中第二段内每个 MBSFN子帧结构示意图。 具体实施方式
本发明的基本思想是: 通过配置承载多小区模式的 MBMS业务的所有 MBSFN子帧中, PDCCH占用的 OFDM符号, 从而提高所述 MBSFN子帧 中可能被 PDCCH占用的 OFDM符号承载 MBMS业务的频率。
下面结合附图对技术方案的实施作进一步的详细描述。
在 LTE中 MBSFN子帧目前规定, MBSFN子帧的前 2个 OFDM符号 可用于 PDCCH, 且 PDCCH 至少使用一个 OFDM符号。 本发明中规定 PDCCH一定使用的 OFDM符号为 MBSFN子帧的第 1个 OFDM符号; PDCCH可能使用的 OFDM符号为 MBSFN子帧的第 2个 OFDM符号, 具 体地, 基站会根据小区需要调度的终端数量, 或者根据小区内需要调度的 终端类型来决定 PDCCH使用第 1个 OFDM符号还是使用第 1、 2个 OFDM 符号。
需要说明的是, 由于单小区模式的 MBMS业务是由小区自己选择资源 发送的, 不需要统一分配资源, 所以不存在背景技术中所述多小区模式 MBMS业务中存在的问题,下面所述 MBMS业务均为多小区模式的 MBMS 业务。
本发明 MBSFN子帧的 OFDM符号分配方法为: OFDM符号分配系统 按照统一的配置规则, 对 MBSFN区域内承载多小区模式 MBMS业务发送 的小区中承载所述 MBMS业务的所有 MBSFN子帧中的 OFDM符号进行分 配。
这里, OFDM符号分配系统按照统一的配置规则, 对 MBSFN区域内 多小区模式 MBMS业务发送的小区中承载所述 MBMS业务的所有 MBSFN 例如,统一的配置规则可以由基站的上级节点发送给 MBSFN区域内所 有承载 MBMS 业务的小区所属的基站, 即 OFDM 符号分配系统包括: MBSFN区域内所有承载 MBMS业务的小区所属的基站和所述基站的上级 节点, 其中 , 基站的上级节点在 LTE 中为多 小 区协作实体 ( Multi-cell/multicast Coordination Entity, MCE )。 图 2为基站的上级节点向 MBSFN区域内所有承载 MBMS业务的小区所属的基站发送统一的配置规 则时, 本发明 MBSFN子帧的 OFDM符号分配方法流程示意图, 如图 2所 示, 此时 MBSFN子帧的 OFDM符号分配方法包括:
步骤 21 : 基站接收来自上级节点的为 PDCCH配置 OFDM符号的配置 规则。
这里所述的基站为 MBSFN区域内所有承载 MBMS业务的小区所属的 基站。
步骤 22: 基站根据接收到的配置规则, 生成相应的 MBSFN子帧中的 PDCCH占用 OFDM符号的控制信令。
这里, 基站一般还需要按照控制信令配置所述 MBSFN子帧。
步骤 23: 基站将生成的控制信令发送至终端。
再例如, 基站的上级节点 (在 LTE中为多小区协作实体 MCE )可以按 照统一的配置规则, 生成 MBSFN子帧中的 PDCCH占用 OFDM符号的控 制信令发送至 MBSFN区域内所有承载 MBMS业务的小区所属的基站, 从 而实现 MBSFN子帧的 OFDM符号分配, 此时, OFDM符号分配系统也包 括: MBSFN区域内所有承载 MBMS业务的小区所属的基站和所述基站的 上级节点。 其中, 基站的上级节点一般为 MCE。 图 3为基站的上级节点按 照统一的配置规则生成控制信令发送至 MBSFN区域内所有承载 MBMS业 务的小区所属的基站时, 本发明 MBSFN子帧的 OFDM符号分配方法流程 示意图, 如图 3所示, 此时 MBSFN子帧的 OFDM符号分配方法包括: 步骤 31 : 基站的上级节点按照统一的配置规则, 生成 MBSFN子帧中 的 PDCCH占用 OFDM符号的控制信令。
这里所述的基站为 MBSFN区域内所有承载 MBMS业务的小区所属的 基站。
步骤 32:基站的上级节点将生成的控制信令发送至所有承载 MBMS业 务的小区所属的基站。
步骤 33: 基站收到来自上级节点的所述控制信令后, 将所述控制信令 转发至终端。
这里, 基站收到来自上级节点的所述控制信令后, 一般还需要按照控 制信令配置所述 MBSFN子帧。
再例如, 还可以将配置规则固定配置在基站上, 基站直接获取固定配 置的配置规则并实现 MBSFN子帧的 OFDM符号分配,即 OFDM符号分配 系统为 MBSFN区域内所有承载 MBMS业务的小区所属的基站, 图 4为配 置规则固定配置在基站上时, 本发明 MBSFN子帧的 OFDM符号分配方法 流程示意图,如图 4所示, 此时 MBSFN子帧的 OFDM符号分配方法包括: 步骤 41:基站获取固定配置的为 PDCCH配置 OFDM符号的配置规则。 这里所述的基站为 MBSFN区域内所有承载 MBMS业务的小区所属的 基站。
步骤 42: 基站根据获取的配置规则, 生成相应的 MBSFN 子帧中的 PDCCH占用 OFDM符号的控制信令。
这里, 基站生成相应的 MBSFN子帧中的 PDCCH占用 OFDM符号的 控制信令后, 一般还需要按照控制信令配置所述 MBSFN子帧。
步骤 43: 基站将生成的控制信令发送至终端。
上述统一的配置规则一般为:对所述 MBSFN区域内的参与所述 MBMS 业务的各个小区中的 MBSFN子帧进行统一分段,每一段内 MBSFN子帧的 PDCCH 占用的 OFDM符号各小区进行统一配置。 这里, 每一段的大小可 以为: MBMS 业务动态调度周期、 或多播控制信道 ( Multicast Control Channel , MCCH )修改周期、 或广播控制信道( BCCH )修改周期、 或者 有限个连续的 MBSFN无线帧、或者有限个连续的 MBSFN子帧等。 需要说 明的是, 这里所述的连续的 MBSFN无线帧并非对所有无线帧而言, 例如, 共有 10个无线帧, 其中编号为 1、 3、 5、 7、 9的为 MBSFN无线帧, 其余 为非 MBSFN无线帧, 则如果说 4个连续的 MBSFN无线帧为一段, 那么此 时是指 1、 3、 5、 7为一段, 而不是 1、 2、 3、 4为一段。 连续的 MBSFN 子帧类同。 另外这里不排除在分段的时候也把非 MBSFN无线帧包含在内, 即不连续的 MBSFN无线帧, 例如, 共有 10个无线帧, 其中编号为 1、 3、 5、 7、 9的为 MBSFN无线帧, 其余为非 MBSFN无线帧, 则如果说 4个连 续的 MBSFN无线帧为一段, 那么此时是指 1、 2、 3、 4为一段。 不连续的 MBSFN子帧类同。
另夕卜, 各段内每个 MBSFN子帧的 PDCCH占用的 OFDM符号可以相 同 ,对现有 LTE系统而言,即每个 MBSFN子帧的 PDCCH占用第 1个 OFDM 符号, 或者前 2个 OFDM符号; 各段内每个 MBSFN子帧的 PDCCH占用 的 OFDM符号也可以不同, 对现有 LTE系统而言, 即段内部分 MBSFN子 帧的 PDCCH占用第 1个 OFDM符号, 剩余 MBSFN子帧的 PDCCH占用 前 2个 OFDM符号。
相应的 , 按照统一的配置规则 , 对承载 MBMS业务的 MBSFN子帧中 的 OFDM符号进行分配为: 所述各个小区根据所述为 PDCCH配置 OFDM 符号的配置规则,将 MBSFN子帧中相应的 OFDM符号分配给 PDCCH,将 MBSFN子帧中剩余的 OFDM符号分配给 MBMS业务。
结合本发明的内容,在目前的 LTE R9中 MBSFN子帧内的 PDCCH统 一使用第 1个 OFDM符号,或者统一使用第 1、 2个 OFDM符号,即 MBSFN 子帧内 MBMS业务统一使用第 2个以及之后的 OFDM符号发送,或者统一 使用第 3个以及之后的 OFDM符号发送。基站可以按照 MBMS业务动态调 度周期、 或者 MCCH修改周期、 或者 BCCH修改周期、 或者有限个连续的 MBSFN 无线帧、 或者有限个连续的 MBSFN 子帧等进行分段, 从而调整 MBMS业务使用的 OFDM符号资源。
通过上述方式, 如果配置一个 MBMS 业务动态调度周期内, 一个 MBSFN区域内所有参与 MBMS业务发送的小区中,用于承载 MBMS业务 的 MBSFN子帧中的第 1个 OFDM符号被 PDCCH使用,那么,即使 MBSFN 区域内某个小区的用户终端数较多, 该小区的 PDCCH也不会占用第 2个 OFDM符号, 从而保证用于承载 MBMS业务的 MBSFN子帧中的第 2个 OFDM符号、即可能被 PDCCH占用的 OFDM符号肯定可以用于发送 MBMS 数据,提高资源利用率; 另外,如果配置一个 MBMS业务动态调度周期内, 一个 MBSFN区域内所有参与 MBMS业务发送的小区中,用于承载 MBMS 业务的 MBSFN子帧中第 1、 2个 OFDM符号统一被 PDCCH使用, 那么, 即使 MBSFN区域内某个小区的用户终端数较少, 该小区的 MBMS业务也 不会占用第 2个 OFDM符号发送 MBMS数据,从而能够在一定程度上避免 MBMS数据传输对 PDCCH的干扰。
需要说明的是,本发明中的把 PDCCH有时使用,有时不使用的 OFDM 符号称为可能被 PDCCH占用的 OFDM符号。针对目前的 LTE协议, MBSFN 子帧中第 2个 OFDM满足可能被 PDCCH占用的 OFDM符号,第一个 OFDM 因为是 PDCCH肯定使用的, 所以不满足可能被 PDCCH占用的 OFDM符 号。 考虑到以后的 MBSFN子帧中有可能把 PDCCH占用的 OFDM符号数 定义为 1个(第一个 OFDM符号)或者 2个(第一个和第二个 OFDM符号) 或者 3个(第一个、 第二个第三个 OFDM符号), 所以, MBSFN子帧中可 能被 PDCCH占用的 OFDM符号并不局限于第 2个 OFDM符号。 图 5为本发明 MBSFN子帧的 OFDM符号分配系统结构示意图, 如图 5所示, 本发明 MBSFN子帧的 OFDM符号分配系统包括: 配置规则提供 单元 51、 控制信令生成单元 52和控制信令发送单元 53 , 其中,
配置规则提供单元 51 , 用于提供统一的配置规则;
控制信令生成单元 52, 用于根据配置规则提供单元提供的配置规则, 生成相应的 MBSFN子帧中的 PDCCH占用 OFDM符号的控制信令, 并按 照控制信令配置所述 MBSFN子帧;
控制信令发送单元 53 , 用于将控制信令生成单元生成的控制信令发送 至终端。
可选的, 所述配置规则提供单元 51 , 位于 MBSFN 区域内所有承载 MBMS业务的小区所属的基站的上级节点上;所述控制信令生成单元 52和 控制信令发送单元 53 ,位于 MBSFN区域内承载 MBMS业务的小区所属的 基站上。
可选的, 配置规则提供单元 51和控制信令生成单元 51 , 位于 MBSFN 区域内所有承载 MBMS业务的小区所属的基站的上级节点上; 控制信令发 送单元 53 ,位于 MBSFN区域内承载 MBMS业务的小区所属的基站和所述 基站的上级节点上。
可选的, 配置规则提供单元 51、控制信令生成单元 52和控制信令发送 单元 53 , 均位于 MBSFN区域内承载 MBMS业务的小区所属的基站上。
配置规则提供单元 51提供的配置规则为: 对所述 MBSFN区域内的参 与所述 MBMS业务的各个小区中的所述 MBSFN子帧进行统一分段, 每一 段内 MBSFN子帧的物理下行控制信道 PDCCH占用的 OFDM符号进行统 一配置。
控制信令生成单元 52配置所述 MBSFN子帧为: 根据所述为 PDCCH 配置 OFDM符号的配置规则,将所述 MBSFN子帧中相应的 OFDM符号分 配给 PDCCH, 将 MBSFN子帧中剩余的 OFDM符号分配给 MBMS业务。 配置规则提供单元 51对所述 MBSFN子帧进行分段为: 根据 MBMS 业务动态调度周期、 或者多播控制信道 MCCH修改周期、 或者广播控制信 道 BCCH修改周期、 或者有限个连续的 MBSFN无线帧、 或者有限个连续 的 MBSFN子帧对所述 MBSFN子帧进行分段。
配置规则提供单元 51 提供的配置规则中对每一段内 MBSFN子帧的 PDCCH占用的 OFDM符号进行统一配置为: 段内承载所述 MBMS业务的 所有 MBSFN子帧的 PDCCH占用的 OFDM符号相同, 即所述 MBSFN区 域内每个小区中每一段内承载所述 MBMS 业务的所有 MBSFN 子帧的 PDCCH占用第 1个 OFDM符号, 或者前 2个 OFDM符号。
下面通过具体实施例对本发明的技术方案作进一步详细描述。
实施例 1
本实施例中, 为 PDCCH配置 OFDM符号的配置规则为: 把 MBSFN 区域内的承载多小区模式 MBMS业务发送的各小区的 MBSFN子帧进行分 段, 所分各段包含相等的 MBSFN子帧数,也可以包含不等的 MBSFN子帧 数。 本实施例中每一段就是一个 MBMS业务动态调度周期。 PDCCH按照 设置的段, 如 MBMS业务动态调度周期, 占用 MBSFN子帧中必须占用的 OFDM符号、 或者占用 MBSFN子帧中必须占用的 OFDM符号和其他可以 占用的 OFDM符号。 针对目前的 LTE R9协议, 即每一段交替占用 MBSFN 子帧的第 1个 OFDM符号、或者占用前 2个 OFDM符号。 所述交替占用可 以是不均匀的, 例如根据业务调度的需求, 可以连续几个段(MBMS业务 动态调度周期 )内的 MBSFN子帧都配置 PDCCH占用第 1个 OFDM符号, 或者都占用前 2个 OFDM符号。
图 6为本发明实施例 1 中 OFDM符号分配示意图, 如图 6所示, 在 MBMS业务的第 N ( N为自然数)段(MBMS业务动态调度周期), 基站 为 PDCCH配置第 1个 OFDM符号,并为 MBMS业务配置 MBSFN子帧中 剩余的 OFDM符号(包括第 2个 OFDM符号); 在 N+1个段( MBMS业务 动态调度周期), 基站为 PDCCH配置前 2个 OFDM符号, 并为 MBMS业 务配置 MBSFN子帧中剩余的 OFDM符号 (不包括第 2个 OFDM符号)。
也可以如此配置, 在 MBMS业务的第 N ( N为自然数 )段( MBMS业 务动态调度周期), 基站为 PDCCH配置第 1个 OFDM符号, 并为 MBMS 业务配置 MBSFN子帧中剩余的 OFDM符号 (包括第 2个 OFDM符号); 在 N+1 , N+2 , N+3共 3个段( MBMS业务动态调度周期),基站为 PDCCH 配置前 2个 OFDM符号,并为 MBMS业务配置 MBSFN子帧中剩余的 OFDM 符号 (不包括第 2个 OFDM符号)。
实施例 2
本实施例中, 对于承载 MBMS业务的 MBSFN子帧进行分段, 每一段 内的 MBSFN子帧的 PDCCH配置相同,每一段包含的 MBSFN子帧个数可 以相等, 也可以不相等(一般实际应用时釆用相等的)。 具体如何分段, 以 及每一段 MBSFN子帧的个数均由配置规则指定,并在 MBSFN区域统一配 置执行,即为 PDCCH配置 OFDM符号的配置规则为:各段应包括的 MBSFN 子帧数(如 4个, 但是实际应用时, 每一段包含的 MBSFN子帧数应该是固 定,通过协议固定下来,这样就不需要通知接收端每一段包含 MBSFN子帧 数)、各段包括的 MBSFN子帧中 PDCCH占用的 OFDM符号进行统一配置, 例如统一配置为 PDCCH占用第 1个 OFDM符号,或者统一配置为 PDCCH 占用前 2个 OFDM符号。
图 7为本发明实施例 2中 MBSFN子帧分段示意图,如图 7所示,对一 个 MBMS业务动态调度周期内的若干个 MBSFN子帧进行分段, 每一段保 持 4个 MBSFN子帧,图中最后一段包括 2个 MBSFN子帧,即一般情况下, 如果最后一个段不能满足配置规则中指示的各段应包括的 MBSFN子帧数, 则实际有几个 MBSFN子帧, 最后一段就保持几个 MBSFN子帧即可。也可 以把最后一段的 MBSFN 子帧和下一个 MBMS 动态调度周期内前 2 个 MBSFN子帧组成一段。 这样分段就不局限于把某一个 MBMS动态调度周 期内的 MBSFN进行分段,而是把 MBSFN区域内各小区所有 MBSFN进行 分段。
对于每一段的 MBSFN子帧的 PDCCH配置相同 OFDM符号, 也就是 说每一段的 MBSFN子帧中承载 MBMS业务的 OFDM符号保持相同,例如, 配置规则指定第一段 MBSFN子帧的 PDCCH占用第 1个 OFDM符号, 那 么, 此时第一段内每个 MBSFN子帧结构如图 8所示, PDCCH占用第 1 个 OFDM符号, MBMS业务使用剩余的包括第 2个 OFDM符号在内的 OFDM符号。 如果配置规则指定第二段 MBSFN子帧的 PDCCH占用第 1、 2个 OFDM符号, 那么, 此时第二段内每个 MBSFN子帧结构如图 9所示, PDCCH占用第 1、 2个 OFDM符号, MBMS业务使用剩余的不包括第 2个 OFDM符号在内的 OFDM符号, 第三段和第一段相同, 依次类推。 这里只 是给出了一个具体的实例, 该实例可以做一些简单的变形, 例如第一段配 置 PDCCH占用 2个 OFDM符号, 第二段配置 PDCCH占用 1个 OFDM符 号; 或者, 第一、 二段配置 PDCCH占用 1个 OFDM符号, 第三、 四段配 置 PDCCH 占用 2个 OFDM符号, 每两段配置相同; 或者, 第一段配置 PDCCH占用 1个 OFDM符号,第二、三、四段配置 PDCCH占用 2个 OFDM 符号,即第 N( N为自然数)段的段数 N取值满足 N mod 4 = 1时配置 PDCCH 占用 1个 OFDM符号,满足 N mod 4 ≠ 1时,配置 PDCCH占用 2个 OFDM 符号等。
实施例 3 帧进行分段, 因为对 MBSFN无线帧进行分段, 实际上也是对 MBSFN子帧 进行分段)。每一段包含的 MBSFN无线帧个数可以相等,也可以不相等(一 般实际应用时釆用相等的)。
可以把一个 MBMS业务动态调度周期内的所有 MBSFN无线帧进行分 段,也可以把 MBSFN区域内各小区的 MBSFN无线帧进行分段, 不局限于 一个 MBMS业务调度周期, 可以跨 MBMS业务动态调度周期。
本实施例中描述一个 MBMS 业务动态调度周期内分段, 不垮多个 MBMS业务动态调度周期, 即在一个 MBMS业务动态调度周期内,把 1个 或者多个承载 MBMS 业务的 MBSFN 无线帧作为一段, 每一段内的承载 MBMS业务的 MBSFN子帧的 PDCCH占用的 OFDM符号配置相同, 每一 段可以包含相等个数的 MBSFN子帧,也可以包含不等个数的 MBSFN子帧, 即为 PDCCH配置 OFDM符号的配置规则为: 各段包括的 MBSFN无线帧 数(但是实际应用时,每一段包含的 MBSFN子帧数应该是固定, 通过协议 固定下来, 这样就不需要通知接收端每一段包含 MBSFN无线帧数)、 各段 包括的 MBSFN子帧中 PDCCH占用的 OFDM符号进行统一配置, 例如统 一配置为 PDCCH占用第 1个 OFDM符号, 或者统一配置为 PDCCH占用 前 2个 OFDM符号。
例如, 每一段包括一个 MBSFN无线帧, 那么, 在一个 MBMS业务动 态调度周期内的若干个 MBSFN 无线帧, 每个 MBSFN 无线帧内的 载 MBMS业务的 MBSFN子帧的 PDCCH配置的 OFDM符号相同, 也就是说 每一段所述 MBSFN子帧中承载 MBMS业务的 OFDM符号保持相同。这样 就可以在承载 MBMS业务的 MBSFN子帧的 PDCCH配置第 1个 OFDM符 号时, 使用第 2个 OFDM符号承载该 MBSFN区域内的 MBMS业务。
也可以如此配置,例如在 3种情况下必须为 MBSFN子帧的 PDCCH配 置 2个 OFDM符号, 1种情况下为 MBSFN子帧的 PDCCH配置 1个 OFDM 符号即可, 那么此时就需要配置 PDCCH占用 2个 OFDM符号的 MBSFN 子帧数目相对于配置 PDCCH占用 1个 OFDM符号的 MBSFN子帧的 3倍。 具体的一种配置如下方法:
满足下面公式的段内的 MBSFN子帧配置的 PDCCH相同的 OFDM符 号数。
N mod M = 1和 N mod M ≠1 , 其中 N为段编号, 为自然数。 M=4, 两 种情况分别各自为 MBSFN子帧的 PDCCH配置相同 , 即满足 N mod M = 1 的 MBSFN无线帧内的 MBSFN子帧的 PDCCH配置第 1个 OFDM符号, 满足 N mod M ≠ 1的 MBSFN无线帧内的 MBSFN子帧的 PDCCH配置前 2 个 OFDM符号。这是一种不均衡的配置,主要是因为根据目前协议 MBSFN 子帧的 PDCCH 配置前 2 个 OFDM 符号的概率较大, 所以才把更多的 MBSFN子帧的 PDCCH配置 2个 OFDM符号。
再例如, 每一段按包括 3个 MBSFN无线帧, 那么, 在一个 MBMS业 务动态调度周期内的若干个 MBSFN无线帧,每 3个 MBSFN无线帧内的承 载 MBMS业务的 MBSFN子帧的 PDCCH配置的 OFDM符号相同,也就是 说每一段所述 MBSFN子帧中承载 MBMS业务的 OFDM符号保持相同。这 样就可以在承载 MBMS业务的 MBSFN子帧的 PDCCH配置第 1个 OFDM 符号时, 使用第 2个 OFDM符号承载该 MBSFN区域内的 MBMS业务。
例如, 每一段按包括 4个 MBSFN无线帧, 那么, 在一个 MBMS业务 动态调度周期内的若干个 MBSFN无线帧, 每 4个 MBSFN无线帧为一段, 这 4个 MBSFN无线帧中有 1个 MBSFN无线帧和其他 3个 MBSFN无线帧 内的承载 MBMS业务的 MBSFN子帧的 PDCCH配置的 OFDM符号不同 , 例如第 4个 MBSFN无线帧和前 3个 MBSFN无线帧不同, 前 3个 MBSFN 无线帧内的 MBSFN子帧的 PDCCH占用 2个 OFDM符号,第 4个 MBSFN 无线帧内的 MBSFN子帧的 PDCCH占用 1个 OFDM符号。 如此, 每一段 保持相同配置。 这样就可以在承载 MBMS业务的 MBSFN子帧的 PDCCH 配置第 1个 OFDM符号时,使用第 2个 OFDM符号承载该 MBSFN区域内 的 MBMS业务。
实施例中所述的分段还可以进一步为,把一个 MCCH修改周期为一段, 或者把一个 BCCH修改周期为一段。 进一步, 本发明可以把一个 MBMS业 务动态调度周期,或者 MCCH修改周期,或者 BCCH修改周期内的 MBSFN 子帧进行分段,也可以不局限于一个 MBMS业务动态调度周期,或者 MCCH 修改周期, 或者 BCCH修改周期内的 MBSFN子帧进行分段, 即分段可以 跨越 MBMS业务动态调度周期, 或者 MCCH修改周期, 或者 BCCH修改 周期。 段内的操作如上述实施例中的操作。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种多播 /组播单频网络 MBSFN子帧的正交频分复用 OFDM符号 分配方法, 其特征在于, 该方法包括: OFDM符号分配系统按照统一的配 置规则, 对 MBSFN区域内承载多小区模式多媒体广播多播 MBMS业务发 送的所有 MBSFN子帧中的 OFDM符号进行分配。
2、根据权利要求 1所述的 OFDM符号分配方法, 其特征在于, 所述配 置规则为: 对所述 MBSFN区域内的参与所述 MBMS业务的各个小区中的 所述 MBSFN子帧进行统一分段,每一段内所述 MBSFN子帧的物理下行控 制信道 PDCCH占用的 OFDM符号进行统一配置。
3、根据权利要求 2所述的 OFDM符号分配方法, 其特征在于, 所述按 照统一的配置规则, 对 7 载所述 MBMS业务发送的所有 MBSFN子帧中的 OFDM符号进行分配为: 所述各个小区根据所述为 PDCCH配置 OFDM符 号的配置规则 , 将所述 MBSFN子帧中相应的 OFDM符号分配给 PDCCH, 将 MBSFN子帧中剩余的 OFDM符号分配给 MBMS业务。
4、根据权利要求 2所述的 OFDM符号分配方法, 其特征在于, 所述对 所述 MBSFN子帧进行分段为: 根据 MBMS业务动态调度周期、 或者多播 控制信道 MCCH修改周期、 或者广播控制信道 BCCH修改周期、 或者有限 个连续的 MBSFN无线帧、 或者有限个连续的 MBSFN子帧对所述 MBSFN 子帧进行分段。
5、 根据权利要求 2所述的 OFDM符号分配方法, 其特征在于, 所述 MBSFN区域内各小区每一段内进行统一配置为: 段内承载所述 MBMS业 务的所有 MBSFN子帧的 PDCCH占用的 OFDM符号相同,即所述 MBSFN 区域内每个小区中每一段内承载所述 MBMS 业务的所有 MBSFN子帧的 PDCCH占用第 1个 OFDM符号, 或者前 2个 OFDM符号。
6、 根据权利要求 2所述的 OFDM符号分配方法, 其特征在于, 所述 MBSFN区域内各小区每一段内进行统一配置为: 段内承载所述 MBMS业 务的所有 MBSFN子帧的 PDCCH占用的 OFDM符号不同,即所述 MBSFN 区域内每个小区中每一段内承载所述 MBMS业务的所有 MBSFN子帧中部 分 MBSFN子帧的 PDCCH占用第 1个 OFDM符号, 剩余 MBSFN子帧的 PDCCH占用前 2个 OFDM符号。
7、 根据权利要求 1所述的 OFDM符号分配方法, 其特征在于, 所述 OFDM符号分配系统包括: 所述 MBSFN区域内所有承载 MBMS 业务的小区所属的基站和所述基站的上级节点,
所述 OFDM符号分配系统按照统一的配置规则, 对 MBSFN区域内承 载多小区模式多媒体广播多播 MBMS 业务发送的所有 MBSFN 子帧中的 OFDM符号进行分配为:
所述 MBSFN区域内所有承载所述 MBMS业务的小区所属的基站接收 来自上级节点的为所述 MBSFN区域内承载多小区模式 MBMS业务的所有 MBSFN子帧的 PDCCH配置 OFDM符号的配置规则;
所述基站根据接收到的配置规则, 生成相应的所述 MBSFN子帧中的 PDCCH占用 OFDM符号的控制信令,并按照控制信令配置所述 MBSFN子 帧;
所述基站将生成的控制信令发送至终端。
8、 根据权利要求 1所述的 OFDM符号分配方法, 其特征在于, 所述 OFDM符号分配系统包括: 所述 MBSFN区域内所有承载 MBMS 业务的小区所属的基站和所述基站的上级节点,
所述 OFDM符号分配系统按照统一的配置规则, 对 MBSFN区域内承 载多小区模式多媒体广播多播 MBMS 业务发送的所有 MBSFN 子帧中的 OFDM符号进行分配为:
所述 MBSFN区域内所有承载所述 MBMS业务的小区所属的基站的上 级节点按照统一的配置规则,生成相应的所述 MBSFN子帧中的 PDCCH占 用 OFDM符号的控制信令;
所述基站的上级节点将生成的控制信令发送至所有承载所述 MBMS业 务的小区所属的基站;
所述基站收到来自上级节点的所述控制信令后, 按照控制信令配置所述 MBSFN子帧, 并将所述控制信令转发至终端。
9、 根据权利要求 1所述的 OFDM符号分配方法, 其特征在于, 所述 OFDM符号分配系统为所述 MBSFN区域内所有承载所述 MBMS 业务的小区所属的基站,
所述 OFDM符号分配系统按照统一的配置规则, 对 MBSFN区域内承 载多小区模式多媒体广播多播 MBMS 业务发送的所有 MBSFN 子帧中的 OFDM符号进行分配为:
所述 MBSFN区域内所有承载所述 MBMS业务的小区所属的基站按照 固定的为所有 MBSFN子帧中的 PDCCH配置 OFDM符号的配置规则; 所述基站根据所述的配置规则, 生成相应的所有 MBSFN 子帧中的 PDCCH占用 OFDM符号的控制信令,并按照控制信令配置所述 MBSFN子 帧;
所述基站将生成的控制信令发送至终端。
10、 一种 MBSFN子帧的 OFDM符号分配系统, 其特征在于, 该系统 包括: 配置规则提供单元、 控制信令生成单元和控制信令发送单元, 其中, 所述配置规则提供单元, 用于提供统一的配置规则;
所述控制信令生成单元, 用于根据配置规则提供单元提供的配置规则, 生成相应的 MBSFN子帧中的 PDCCH占用 OFDM符号的控制信令, 并按 照控制信令配置所述 MBSFN子帧;
所述控制信令发送单元, 用于将控制信令生成单元生成的控制信令发 送至终端。
11、 根据权利要求 10所述的 OFDM符号分配系统, 其特征在于, 所述配置规则提供单元, 位于 MBSFN区域内所有承载 MBMS业务的 小区所属的基站的上级节点上;
所述控制信令生成单元和控制信令发送单元,位于 MBSFN区域内承载 MBMS业务的小区所属的基站上。
12、 根据权利要求 10所述的 OFDM符号分配系统, 其特征在于, 所述配置规则提供单元和控制信令生成单元,位于 MBSFN区域内所有 承载 MBMS业务的小区所属的基站的上级节点上;
所述控制信令发送单元, 位于 MBSFN区域内承载 MBMS业务的小区 所属的基站和所述基站的上级节点上。
13、 根据权利要求 10所述的 OFDM符号分配系统, 其特征在于, 所述配置规则提供单元、 控制信令生成单元和控制信令发送单元, 均 位于 MBSFN区域内承载 MBMS业务的小区所属的基站上。
14、 根据权利要求 10至 13任一项所述的 OFDM符号分配系统, 其特 征在于,所述配置规则提供单元提供的配置规则为:对所述 MBSFN区域内 的参与所述 MBMS业务的各个小区中的所述 MBSFN子帧进行统一分段, 每一段内 MBSFN子帧的物理下行控制信道 PDCCH占用的 OFDM符号进 行统一配置。
15、根据权利要求 14所述的 OFDM符号分配系统, 其特征在于, 所述 控制信令生成单元配置所述 MBSFN 子帧为: 根据所述为 PDCCH 配置 OFDM符号的配置规则, 将所述 MBSFN子帧中相应的 OFDM符号分配给 PDCCH, 将 MBSFN子帧中剩余的 OFDM符号分配给 MBMS业务。
16、根据权利要求 14所述的 OFDM符号分配系统, 其特征在于, 所述 配置规则提供单元对所述 MBSFN子帧进行分段为: 根据 MBMS业务动态 调度周期、 或者多播控制信道 MCCH修改周期、 或者广播控制信道 BCCH 修改周期、 或者有限个连续的 MBSFN无线帧、 或者有限个连续的 MBSFN 子帧对所述 MBSFN子帧进行分段。
17、根据权利要求 14所述的 OFDM符号分配系统, 其特征在于, 所述 配置规则提供单元提供的配置规则中对每一段内 MBSFN子帧的 PDCCH占 用的 OFDM 符号进行统一配置为: 段内承载所述 MBMS 业务的所有 MBSFN子帧的 PDCCH占用的 OFDM符号相同,即所述 MBSFN区域内每 个小区中每一段内承载所述 MBMS业务的所有 MBSFN子帧的 PDCCH占 用第 1个 OFDM符号, 或者前 2个 OFDM符号。
PCT/CN2010/075632 2009-08-11 2010-08-02 多播/组播单频网络子帧的ofdm符号分配方法及系统 WO2011018000A1 (zh)

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