CN107205228B - Method, device and system for sending MBMS (multimedia broadcast multicast service) - Google Patents

Method, device and system for sending MBMS (multimedia broadcast multicast service) Download PDF

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CN107205228B
CN107205228B CN201610167650.4A CN201610167650A CN107205228B CN 107205228 B CN107205228 B CN 107205228B CN 201610167650 A CN201610167650 A CN 201610167650A CN 107205228 B CN107205228 B CN 107205228B
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simulcast
cell
pdsch
mbms service
configuration information
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CN107205228A (en
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魏立梅
袁乃华
范晨
周志宏
魏明华
黄杨晖
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Chengdu TD Tech Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

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

Abstract

The embodiment of the invention provides a method, a device and a system for sending an MBMS service, wherein the method comprises the following steps: determining a simulcast area and configuration information of a first MBMS service; the configuration information includes: a simulcast subframe of the first MBMS, a first bandwidth occupied by a PDSCH of the first MBMS and a first coding modulation method are sent in the simulcast subframe; sending the ID of the first MBMS service and the configuration information to each cell in the simulcast area; and transmitting the first MBMS service through a PDSCH according to the ID and the configuration information of the first MBMS service, and transmitting the same service through the same resources and coding modes on cells in a simulcast region, so that the cells can obtain diversity gain and avoid same frequency interference.

Description

Method, device and system for sending MBMS (multimedia broadcast multicast service)
Technical Field
The embodiment of the invention relates to a communication technology, in particular to a method, a device and a system for sending a multimedia Broadcast multicast Service (MBMS for short).
Background
In a Long Term Evolution (LTE) system, MBMS service may be transmitted in an MBMS Single Frequency Network (MBSFN) manner: and sending the same MBMS service to all cells belonging to the same predetermined MBSFN area on the same MBSFN subframe through the same Physical Multicast Channel (PMCH), so that a user receiving the MBMS service can obtain diversity gain.
However, in general, users receiving the MBMS service only exist in some cells within the MBSFN area, and according to the above transmission method, air interface resources are wasted when the MBMS service is transmitted in cells without users. In order to solve the problem that the air interface resources are wasted in the MBSFN mode, a Single Cell Point to multipoint (SC-PTM) mode is introduced into an LTE system to send the MBMS, only the Cell where the user receiving the MBMS is located is selected to send in the same MBSFN area, and each Cell automatically determines the air interface resources and a Modulation Coding Scheme (MCS) used for sending the MBMS so as to save the air interface resources of other cells without users.
The SC-PTM mode is adopted to send the MBMS, although the waste of air interface resources of the MBSFN mode can be avoided, the MBMS is subjected to same frequency interference when being received and the diversity gain of the MBSFN mode can not be obtained: when the MBMS is sent in the SC-PTM mode, the cell automatically decides to send the air interface resource and MCS used by the MBMS, so that the MBMS signals sent by different cells of the same MBMS are usually different, and a user can not only carry out diversity combination on the MBMS signals from different cells to obtain diversity gain, but also receives the same frequency interference from the MBMS of other cells when receiving the MBMS sent by the cell.
Disclosure of Invention
The method, the device and the system for sending the MBMS provided by the embodiment of the invention solve the problems that when the MBMS is sent in an SC-PTM mode, a cell automatically determines to send the air interface resource and MCS used by the MBMS, a user can not carry out diversity combination on MBMS signals from different cells to obtain diversity gain, and the MBMS sent by the cell is subjected to same-frequency interference from the MBMS of other cells when receiving the MBMS.
A first aspect of an embodiment of the present invention provides a method for sending an MBMS service, where the method includes:
determining a simulcast area and configuration information of a first MBMS service; the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS, a first bandwidth occupied by a PDSCH of the first MBMS and a first coding modulation method are sent in the simulcast subframe;
sending the ID of the first MBMS service and the configuration information to each cell in the simulcast area;
and sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information.
Optionally, the first bandwidth is used to indicate at least one continuous RB occupied by the PDSCH.
Optionally, the configuration information further includes the number of antenna ports and a physical layer cell identifier of each cell transmitting a cell reference signal CRS in the simulcast region; determining that the configuration information further comprises:
acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
then, sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information includes:
transmitting the first MBMS service through PDSCH in the simulcast subframe; wherein the PDSCH is mapped to resource elements not occupied by CRS of each cell within the simulcast region in at least one consecutive RB indicated by the first bandwidth.
Optionally, the configuration information further includes the number of antenna ports and a physical layer cell identifier of each cell transmitting a cell reference signal CRS in the simulcast region; determining that the configuration information further comprises:
acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
then, sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information includes:
configuring a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB of the first bandwidth indication;
the first MBMS service is sent through a PDSCH in the simulcast subframe, and the simulcast reference signal is sent while the PDSCH is sent; wherein the simulcast reference signal is mapped to resource elements not occupied by CRS of each cell in the simulcast region; and mapping the PDSCH to resource units which are not occupied by the CRS and the simulcast reference signal of each cell in the simulcast region.
Optionally, the configuration information further includes: a first indication to indicate that each cell within the simulcast region does not transmit CRS on at least one consecutive RB of the first bandwidth indication;
then, sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information includes:
configuring a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB of the first bandwidth indication;
the first MBMS service is sent through a PDSCH in the simulcast subframe, and the simulcast reference signal is sent while the PDSCH is sent; wherein the PDSCH is mapped to resource elements not occupied by the simulcast reference signal.
A second aspect of the present invention provides a device for sending an MBMS service, including:
the processing module is used for determining a simulcast area and configuration information of a first MBMS service; the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS, a first bandwidth occupied by a PDSCH of the first MBMS and a first coding modulation method are sent in the simulcast subframe;
a first sending module, configured to send the identifier ID of the first MBMS service and the configuration information to each cell in the simulcast area;
and the second sending module is used for sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information.
Optionally, the first bandwidth determined by the processing module is used to indicate at least one continuous resource block RB occupied by the PDSCH.
Optionally, the configuration information further includes the number of antenna ports and a physical layer cell identifier of each cell transmitting a cell reference signal CRS in the simulcast region; the processing module is further configured to: acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
the second sending module is specifically configured to: transmitting the first MBMS service through PDSCH in the simulcast subframe; wherein the PDSCH is mapped to resource elements not occupied by CRS of each cell within the simulcast region in at least one consecutive RB indicated by the first bandwidth.
Optionally, the configuration information further includes the number of antenna ports and a physical layer cell identifier of each cell transmitting a cell reference signal CRS in the simulcast region; the processing module is further configured to: acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
the second sending module specifically includes:
a first processing unit, configured to configure a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB indicated by the first bandwidth;
a first sending unit, configured to send the first MBMS service through a PDSCH in the simulcast subframe, and send the simulcast reference signal while sending the PDSCH; wherein the simulcast reference signal is mapped to resource elements not occupied by CRS of each cell in the simulcast region; and mapping the PDSCH to resource units which are not occupied by the CRS and the simulcast reference signal of each cell in the simulcast region.
Optionally, the configuration information further includes: a first indication to indicate that each cell within the simulcast region does not transmit CRS on at least one consecutive RB of the first bandwidth indication;
then according to the second sending module comprising:
a second processing unit, configured to configure a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB indicated by the first bandwidth;
a second sending unit, configured to send the first MBMS service through a PDSCH in the simulcast subframe, and send the simulcast reference signal while sending the PDSCH; wherein the PDSCH is mapped to resource elements not occupied by the simulcast reference signal.
A third aspect of the embodiments of the present invention provides a system for sending an MBMS service, including: an MCE and at least one base station; the MCE is used for:
determining a simulcast area and configuration information of a first MBMS service; the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS, a first bandwidth occupied by a PDSCH of the first MBMS and a first coding modulation method are sent in the simulcast subframe;
sending the ID of the first MBMS service and the configuration information to each cell in the simulcast area;
the at least one base station is configured to:
and sending the first MBMS service through PDSCH in the cell in the simulcast region according to the ID of the first MBMS service and the configuration information.
The method, the device and the system for sending the MBMS provided by the embodiment of the invention determine a simulcast region and configuration information for sending the MBMS in a certain region, wherein the configuration information comprises a simulcast subframe, a first bandwidth and a first coding modulation method, the same configuration information is used for each cell in the simulcast region, the same first MBMS is sent, and the MBMS is sent in a mode of SC-PTM in a region outside the simulcast region, so that users in the simulcast region can obtain diversity gain and can avoid same-frequency interference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a first embodiment of a method for transmitting an MBMS service according to the present invention;
fig. 2 is a schematic structural diagram of a first transmitting device of an MBMS service according to the present invention;
fig. 3 is a schematic structural diagram of a second transmitting device of the MBMS service according to the present invention;
fig. 4 is a schematic structural diagram of a third transmitting device of an MBMS service according to the present invention;
fig. 5 is a schematic diagram of an architecture of an embodiment of a MBMS service transmission system according to the present invention;
fig. 6 is a schematic structural diagram of an embodiment of an MCE provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is applied to network side equipment, for example: a base station, a Multi-cell/multicast coordination network element (MCE for short), or other network elements, where the MCE or other network elements may be set independently or directly in the base station, which is not limited in the present invention.
Fig. 1 is a flowchart of a first embodiment of a method for sending an MBMS service according to the present invention, and as shown in fig. 1, in order to solve the problem that a user cannot acquire diversity gain and cause co-channel interference when an SC-PTM method is used to send an MBMS service in the background art, the present scheme proposes a simulcast SC-PTM scheme, that is, the specific steps of the method for sending an MBMS service provided in this embodiment are as follows:
s101: and determining a simulcast area and configuration information of the first MBMS service.
In this embodiment, the simulcast area is formed by a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS service transmits a first bandwidth occupied by a Physical Downlink Shared Channel (PDSCH) of the first MBMS service in the simulcast subframe, and a first coding modulation method; the simulcast subframe is a downlink subframe for transmitting the first MBMS service, and the first bandwidth occupied by the PDSCH indicates a plurality of consecutive Resource blocks (RB for short) occupied by the PDSCH.
Optionally, a specific manner of acquiring the simulcast area is as follows: acquiring the user distribution condition of each cell in the MBMS service area to be sent; and taking the adjacent cell including the user capable of receiving the MBMS as the simulcasting area. That is, the MCE (or other network element) can set the simulcast area of the service in several adjacent cells where the user frequently appears according to the distribution situation of the user or the distribution situation expected by the user.
S102: and sending the ID of the first MBMS service and the configuration information to each cell in the simulcast area.
In this step, after acquiring the configuration information for sending the MBMS service in the simulcast area as needed, the MCE or other network elements may need to broadcast the configuration information and an identifier (identity, abbreviated as ID) of the first MBMS service to be sent to each cell in the simulcast area.
S103: and sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information.
In this embodiment, for an MBMS service, the service is sent in a simulcast area of the MBMS service in a simulcast SC-PTM manner, that is: each cell in the simulcast region sends the same MBMS service by using the same resource and modulation coding Scheme (MCS for short), and according to the configuration information, the first MBMS service is sent by adopting the first coding modulation method on the simulcast subframe and the continuous RB indicated by the first bandwidth through the PDSCH, so that users in the simulcast region can obtain diversity gain, and the interruption and the discarding of service data can not be caused when the users move between the cells in the simulcast region.
For cells that are not within the simulcast zone, such as: there are some cells distributed sporadically for users, and each cell still transmits the MBMS service by the existing SC-PTM method, that is: and the cell determines the time-frequency resource and MCS adopted by the service.
In the sending method of the MBMS service provided in this embodiment, a simulcast area for sending the MBMS service is determined in a certain area, the same first MBMS service is sent using the same configuration information for each cell in the simulcast area, and the MBMS service is sent using an SC-PTM method in an area outside the simulcast area, so that users in the simulcast area can obtain diversity gain, and co-frequency interference can be avoided.
In order to implement the above scheme, the concept of a simulcast area, a simulcast subframe and a simulcast bandwidth (i.e. the first bandwidth mentioned above, and the simulcast bandwidth in the subsequent scheme has the same meaning as the first bandwidth) is introduced in the scheme. In simulcast SC-PTM, the concepts are applied to the downlink MBMS service transmission, wherein a simulcast area is composed of a plurality of adjacent cells, and the same service can be transmitted in the cells through the same air interface resource and MCS, so that users in the cells can obtain diversity gain, and the same frequency interference is avoided. In the simulcast subframe, the whole bandwidth is divided into simulcast bandwidth and common bandwidth occupied by each MBMS service transmitted in a simulcast SC-PTM mode. The simulcast bandwidth of each MBMS service consists of several resource blocks within the whole bandwidth. The normal bandwidth is composed of the other RBs remaining in the entire bandwidth. When the simulcast bandwidth is allocated to each MBMS service, RBs occupied by each MBMS service may be connected back and forth, for example: and allocating simulcast bandwidth to each MBMS service in sequence from the lowest RB of the whole bandwidth, so that the MBMS services intensively occupy a section of bandwidth at the low end of the whole frequency band, and the rest bandwidth can be used by other services, thereby allocating the simulcast bandwidth to avoid resource fragments in the whole bandwidth and being beneficial to resource allocation of other services.
In a specific implementation, the number of simulcast subframes and the size of the simulcast bandwidth of the MBMS service in the simulcast subframes may be determined according to the rate of the MBMS service expected to be transmitted in a simulcast SC-PTM manner in the cell. For example, the MCS, the number of occupied resource blocks, and the scheduling period adopted by each traffic rate are usually configured in advance.
In addition, in order to obtain diversity gain for users in the simulcast region, cells in the entire simulcast region use the same MCS to transmit the same transport block of the same service, i.e., transmit the same service data, within the simulcast bandwidth of one simulcast subframe. The resource unit mapping mode of the Physical Downlink Shared Channel (PDSCH) for transmitting the service in the simulcast bandwidth of the simulcast subframe and the reference signal based on demodulation are different from the PDSCH in the non-simulcast subframe and the PDSCH in the normal bandwidth of the simulcast subframe.
In this scheme, the frame structure of simulcast SC-PTM may be specifically designed as:
the simulcast SC-PTM supports the existing subframe structure under the Normal Cyclic Prefix (NCP for short) and the Extended Cyclic Prefix (ECP for short): each subframe is composed of a control field and a data field.
The number of symbols occupied by the control field in each subframe is indicated by a Physical Control Format Indicator Channel (PCFICH)
The data field is divided into: simulcast bandwidth and common bandwidth occupied by each MBMS service. The RB occupied by each MBMS service forms the simulcast bandwidth of the MBMS service; the other RBs constitute a normal bandwidth. The physical channel transmitted by the control domain and the physical channel transmitted by the data domain are the same as the existing protocol.
(I), control domain:
the control domain supports a Cell-specific Reference Signal (CRS) for demodulation of a control channel (PCFICH/PHICH/PDCCH);
resource elements (RE for short) of the CRS and the physical channel of the control domain are mapped with the existing protocol.
(II), data field
The common bandwidth supports the physical channels and Reference Signals (RS) supported by the existing protocol, and the RE mapping of the channels and the RS is the same as the existing protocol;
and only supporting the MBMS service of sending the simulcast SC-PTM in the simulcast bandwidth, wherein the service is sent through a PDSCH, and the RS used by the RE mapping of the PDSCH and the PDSCH demodulation in the simulcast bandwidth needs to be redefined.
To better support simulcast SC-PTM, support is made within one radio frame except that the following subframes must have the same CP type and length as subframe 0, and other subframes may be configured with a different CP type than subframe 0. The configuration Information is broadcasted to the UE through a System Information Block (SIB).
(1) Time Division Duplex (TDD): subframe 1, subframes 5 and 6;
(2) frequency Division Duplex (FDD): subframe 5
In TDD, subframe 1 and subframe 6 include a primary synchronization signal, and subframe 0 and subframe 5 include a secondary synchronization signal. The UE typically determines the CP type from the secondary synchronization signal of TS0/TS5 and the primary synchronization signal of TS1/TS 6. Therefore, subframes 1, 5, and 6 should have the same CP length as subframe 0. For FDD, subframe 0 and subframe 5 include a primary synchronization signal and a secondary synchronization signal, and thus subframe 5 should have the same CP as subframe 0.
Based on the above, several specific implementation manners for acquiring the first time-frequency resource and the first coding manner are described below:
in the first mode, the number of antenna ports and the physical layer cell identifier of CRS (cell-specific reference signal) sent by each cell in the simulcast region are obtained; that is, when the configuration information is determined to be implemented specifically, the number of antenna ports and the physical layer cell identifier for transmitting the CRS by each cell in the simulcast area need to be acquired. The specific implementation of sending the first MBMS service according to the configuration information is as follows: transmitting the first MBMS service through PDSCH in the simulcast subframe; wherein the PDSCH is mapped to resource elements not occupied by CRS of each cell within the simulcast region in at least one consecutive RB indicated by the first bandwidth.
The meaning is as follows: CRSs of each cell are broadcasted in a simulcast bandwidth, PDSCHs in the simulcast bandwidth are demodulated based on the CRSs, and the PDSCHs are mapped to Resource elements (RE for short) which are not occupied by the CRSs of the cells. And the MCE responsible for determining the simulcast region informs the number of antenna ports and physical layer cell Identification (ID) of CRS (cell-specific reference signal) sent by each cell in the simulcast region to each cell. Each cell can determine the REs occupied by CRS of each cell according to the information, and the REs are avoided during PDSCH mapping. The time domain position of the CRS is determined by the number of antenna ports for transmitting the CRS, and the frequency domain position of the CRS is determined by the value modulo 6 of the physical layer cell ID. Therefore, in order to avoid the CRS of each cell by PDSCH mapping, it is necessary to notify each cell of the number of antenna ports and the physical layer cell ID (or ID MOD 6) for transmitting the CRS by each cell in the simulcast region.
By using the design scheme, the RS based on PDSCH demodulation in the simulcast bandwidth does not need to be redesigned, CRS-based measurement of old UE (UE not supporting simulcast SC-PTM) is not influenced, and non-MBMS service of the new UE and the old UE can be scheduled in the common bandwidth.
In a second mode, the number of antenna ports and physical layer identifiers occupied by CRS (cell-specific reference signal) sent by each cell in the simulcast region are obtained; that is, when the configuration information is determined to be implemented specifically, the number of antenna ports and the physical layer cell identifier for transmitting the CRS by each cell in the simulcast area need to be acquired. Then, sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information includes: configuring a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB of the first bandwidth indication;
the first MBMS service is sent through a PDSCH in the simulcast subframe, and the simulcast reference signal is sent while the PDSCH is sent; wherein the simulcast reference signal is mapped to resource elements not occupied by CRS of each cell in the simulcast region; and mapping the PDSCH to resource units which are not occupied by the CRS and the simulcast reference signal of each cell in the simulcast region.
The meaning is as follows: in order to solve the problem that the channel estimation and the PDSCH demodulation in the simulcast bandwidth are subject to co-channel interference in the first mode, the mode designs a simulcast Reference Signal (English: Reference Signal, for short: RS) in the simulcast bandwidth for the demodulation of the PDSCH. Simulcast RSs are mapped onto REs occupied by non-CRS. The PDSCH is mapped to REs not occupied by CRS and simulcast RS. Specifically, the CRS of each cell is still broadcast in the simulcast bandwidth to support scheduling of the old UE in the normal bandwidth; designing a special RS for PDSCH demodulation in a simulcast bandwidth: simulcasting RSs, which are mapped to REs occupied by non-CRS; PDSCH is mapped to REs not occupied by these cell CRS and simulcast RS. And the MCE responsible for determining the simulcasting area informs the number of antenna ports for sending CRSs by each cell in the simulcasting area and the ID of the physical layer cell to each cell. Each cell can determine the REs occupied by CRS of each cell according to the information, and avoids the REs when the simulcast RS and the PDSCH are mapped.
By using the design scheme, the measurement of the old UE based on the CRS can not be influenced, and the new UE and the old UE can be scheduled in the common bandwidth; and introducing a simulcast RS to ensure that channel estimation and PDSCH demodulation of group users in a simulcast bandwidth are not influenced by same frequency interference.
In a third manner, different from the two manners, the configuration information further includes: a first indication to indicate that each cell within the simulcast region does not transmit CRS on at least one consecutive RB of the first bandwidth indication; then, sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information includes: configuring a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB of the first bandwidth indication;
the first MBMS service is sent through a PDSCH in the simulcast subframe, and the simulcast reference signal is sent while the PDSCH is sent; wherein the PDSCH is mapped to resource elements not occupied by the simulcast reference signal.
The meaning is as follows: the two modes reserve CRSs of each cell in a simulcast bandwidth so as to enable the measurement of the old UE not to be influenced, and the old UE can be scheduled in a common bandwidth. However, the pilot occupies too many REs. In a third mode, for improving the pilot efficiency in the simulcast bandwidth, the following scheme is adopted: not broadcasting CRS of each cell in the simulcast bandwidth; designing a special RS for PDSCH demodulation in a simulcast bandwidth: simulcasting RS; the PDSCH is mapped to REs not occupied by the simulcast RS.
The advantages of this approach are: CRS broadcasting is not supported in the simulcast bandwidth, so that the number of pilot frequencies is greatly reduced, and the air interface efficiency is improved; introducing a simulcast RS to ensure that channel estimation and PDSCH demodulation of users in a simulcast bandwidth are not influenced by same frequency interference; the MCE does not need to inform the cell of the number of antenna ports and the physical layer cell ID of CRS transmitted by the cell.
In each of the above implementations, only when all users in an MBMS service support simulcast SC-PTM, can the service be scheduled within the simulcast bandwidth of the simulcast subframe.
The simulcast RS is used in the second and third modes, and can be generated in the following three ways.
(1) Generating simulcast RS using CRS formula
And generating a simulcast RS of the service on the RB occupied by the service according to a CRS generation formula: and replacing the ID of the physical layer cell by using a service Radio Network Temporary Identifier (RNTI), wherein the simulcast RSs sent by each cell in the simulcast region are the same. If the service is a group service, the service RNTI is a group RNTI.
Specifically, the simulcast RS sequence is generated as follows
Figure BDA0000944939280000111
Figure BDA0000944939280000112
In the above formula, nsIs a time slot number in a wireless frame; l is the symbol number of Orthogonal Frequency Division Multiplexing (OFDM for short) in the time slot;
Figure BDA0000944939280000113
is the maximum downlink bandwidth; initialization parameter c of pseudorandom sequence c (i)initAccording to the following formulaGeneration of nRNTIIs the RNTI of the service.
cinit=210·(7·(ns+1)+l+1)·(2·nRNTI+1)+2·nRNTI+NCP
Figure BDA0000944939280000114
The mapping of simulcast RSs to REs is as follows:
Figure BDA0000944939280000121
in the above formula, the first and second carbon atoms are,
k＝6m+(v+vshift)mod6
Figure BDA0000944939280000122
Figure BDA0000944939280000123
Figure BDA0000944939280000124
v and vshiftThe definition is as follows:
Figure BDA0000944939280000125
vshift＝nRNTImod6，
Figure BDA0000944939280000126
the number of RBs occupied for the service, i.e., the first bandwidth or the simulcast bandwidth.
In the second scheme, to avoid mapping the CRS of the cell and the simulcast RS to the same RE, l + lshift，lshiftConfigured by the MCE as 1 or 2, or fixed as 1 or 2.
The range of p depends on the MCE. When the MCE determines that the number of antenna ports for transmitting the simulcast RS is P, P is less than P. When the simulcast RS is actually transmitted, single antenna port transmission or multi-antenna port transmission may be adopted.
When single antenna port transmits, even if P >1, the simulcast RSs mapped to different ports according to the above formula are transmitted through REs at corresponding positions on the same antenna port 0. When the multi-antenna port transmits, P is more than 1, and simulcasting RSs of different antenna ports are respectively transmitted through corresponding ports.
(2) Generating simulcast RS using UE RS formula
And generating a simulcast RS on the RB occupied by the service according to a UE-dedicated RS generating formula.
Specifically, the simulcast RS sequence is generated as follows
Figure BDA0000944939280000127
Figure BDA0000944939280000128
In the above formula, nsIs a time slot number in a wireless frame;
Figure BDA0000944939280000129
the number of RBs occupied for the service; initialization parameter c of pseudorandom sequence c (i)initIs produced according to the following formula nRNTIIs the RNTI of the service,
Figure BDA00009449392800001210
the ID of the simulcast area may be fixed to 0.
Figure BDA0000944939280000131
The mapping of simulcast RSs to REs is as follows:
Normal cyclic prefix:
Figure BDA0000944939280000132
Figure BDA0000944939280000133
Figure BDA0000944939280000134
Figure BDA0000944939280000135
Figure BDA0000944939280000136
Figure BDA0000944939280000137
Extended cyclic prefix:
Figure BDA0000944939280000138
Figure BDA0000944939280000139
Figure BDA00009449392800001310
Figure BDA00009449392800001311
Figure BDA00009449392800001312
Figure BDA00009449392800001313
in the above formula, m' is the counter of the simulcast RS in one OFDM symbol,
Figure BDA00009449392800001318
p＝0。
(3) generation of simulcast RS using MBSFN RS formula
Generating a simulcast RS on the service occupied PRB according to an MBSFN RS generation formula: using service ID instead of MBSFN area ID
Figure BDA00009449392800001315
In particular, simulcast RS sequences
Figure BDA00009449392800001316
The definition is as follows:
Figure BDA00009449392800001317
in the above formula, nsIs a time slot number in a wireless frame; l is the OFDM symbol number in the time slot;
Figure BDA0000944939280000141
is the maximum downlink bandwidth; initialization parameter c of pseudorandom sequence c (i)initIs produced according to the following formula nRNTIIs the RNTI of the service.
cinit＝29·(7·(ns+1)+l+1)·(2·nRNTI+1)+nRNTI
The mapping of simulcast RSs to REs is as follows:
Figure BDA0000944939280000142
in the above formula, p is 0,
Figure BDA0000944939280000143
Figure BDA0000944939280000144
Figure BDA0000944939280000145
Figure BDA0000944939280000146
in the above formula, the first and second carbon atoms are,
Figure BDA0000944939280000147
the number of RBs occupied for the service.
In the first and second methods, the new UE needs to be notified of the following information:
the number of antenna ports and the physical layer cell ID (or physical layer cell ID modulo 6) of CRS transmitted by each cell in the simulcast region
In the technical scheme of the invention, the UE supporting the simulcast SC-PTM needs to report the capability to the network. In the third mode, for the old UE not supporting the simulcast SC-PTM, if the measurement of the old UE based on the CRS is affected by no CRS in the simulcast bandwidth and is not negligible, when the network uses the simulcast SC-PTM, the old UE is notified of the subframe occupied by the simulcast SC-PTM as the MBSFN subframe through the existing protocol. For the new UE supporting the simulcast SC-PTM, when the network adopts the simulcast SC-PTM, the new UE is informed of the subframe occupied by the simulcast SC-PTM and the RB range occupied by the simulcast bandwidth through the SIB. And the new UE receives the physical channel in the common bandwidth and the MBMS service in the simulcast bandwidth in the subframes according to the scheduling information. When there is an old UE in an MBMS service, the service cannot be scheduled using simulcast bandwidth.
The PDSCH is transmitted in a single layer with single antenna port or transmit diversity. And the PDSCH in the simulcast bandwidth only occupies the REs used by the non-RS when the REs are mapped.
If the PDSCH supports the transmission diversity, each cell is required to report the number of ports for sending CRS, and the MCE determines the number of the ports for sending the PDSCH according to the cell with the minimum CRS port number in the simulcast region. Each cell is instructed to transmit with that number either a single antenna transmission or a transmit diversity transmission.
Initialization parameter c of scrambling sequence when PDSCH is scrambledinitGenerated according to the following formula:
Figure BDA0000944939280000151
in the above formula, nRNTIThe terminal is a service RNTI which is the RNTI of a group when the service is a group service, G-RNTI, and q ∈ {0 and 1} respectively correspond to a code word 0 and a code word 1, and q is 0 when a single code word is transmitted;
Figure BDA0000944939280000152
is the simulcast area ID or fixed to 0. The MCE may assign different IDs to different simulcast regions.
The PDSCH resource allocation supports TYPE2 resource allocation. And CSI reporting and Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback is not supported.
The technical scheme of the invention provides a simulcasting SC-PTM scheme, if adjacent cells all send the same service, the cells are determined as simulcasting areas, and the same service is sent in the cells by adopting the same air interface resources and MCS, so that a user can obtain diversity gain when receiving the service, and the user can not cause the interruption and the loss of service data when moving between the cells. In addition, in the specific implementation, the network can schedule the UEs supporting simulcast SC-PTM and the UEs not supporting simulcast SC-PTM in the common bandwidth of the simulcast subframe, so that the user can obtain diversity gain and improve spectrum efficiency while the MBMS service and the common service share the whole bandwidth.
Fig. 2 is a schematic structural diagram of a first embodiment of a sending apparatus for an MBMS service according to the present invention, and as shown in fig. 2, the sending apparatus 10 for an MBMS service includes: a processing module 11, a first sending module 12 and a second sending module 13.
A processing module 11, configured to determine a simulcast area and configuration information of a first MBMS service; the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS service, a first bandwidth occupied by a Physical Downlink Shared Channel (PDSCH) of the first MBMS service and a first coding modulation method are sent in the simulcast subframe;
a first sending module 12, configured to send the identifier ID of the first MBMS service and the configuration information to each cell in the simulcast area;
a second sending module 13, configured to send the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information.
Optionally, the first bandwidth determined by the processing module 11 is used to indicate at least one continuous resource block RB occupied by the PDSCH.
Optionally, the configuration information further includes the number of antenna ports and a physical layer cell identifier of each cell transmitting a cell reference signal CRS in the simulcast region; the processing module 11 is further configured to: acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
the second sending module 13 is specifically configured to: transmitting the first MBMS service through PDSCH in the simulcast subframe; wherein the PDSCH is mapped to resource elements not occupied by CRS of each cell within the simulcast region in at least one consecutive RB indicated by the first bandwidth.
The sending apparatus of MBMS service provided in this embodiment is used in the technical solution of the foregoing method embodiment, and its implementation principle and technical effect are similar, and the same MBMS service is sent through the same resource and coding method on the cells in the simulcast area, so that these cells can obtain diversity gain, and can avoid co-channel interference.
Fig. 3 is a schematic structural diagram of a second transmitting apparatus of an MBMS service according to the present invention, and as shown in fig. 3, on the basis of the foregoing embodiment, the configuration information further includes the number of antenna ports and a physical layer cell identifier of a cell reference signal CRS transmitted by each cell in the simulcast region; the processing module 11 is further configured to: acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
the second sending module 13 specifically includes:
a first processing unit 131, configured to configure a simulcast reference signal for PDSCH demodulation on at least one consecutive RB indicated by the first bandwidth;
a first sending unit 132, configured to send the first MBMS service through a PDSCH in the simulcast subframe, and send the simulcast reference signal while sending the PDSCH; wherein the simulcast reference signal is mapped to resource elements not occupied by CRS of each cell in the simulcast region; and mapping the PDSCH to resource units which are not occupied by the CRS and the simulcast reference signal of each cell in the simulcast region.
The sending apparatus of MBMS service provided in this embodiment is used in the technical solution of the foregoing method embodiment, and its technical effect and implementation principle are similar, and are not described herein again.
Fig. 4 is a schematic structural diagram of a third embodiment of a sending apparatus for an MBMS service according to the present invention, and as shown in fig. 4, the configuration information further includes: a first indication to indicate that each cell within the simulcast region does not transmit CRS on at least one consecutive RB of the first bandwidth indication;
then, according to the second sending module 13, the method includes:
a second processing unit 133, configured to configure a simulcast reference signal for PDSCH demodulation on at least one consecutive RB indicated by the first bandwidth;
a second sending unit 134, configured to send the first MBMS service through a PDSCH in the simulcast subframe, and send the simulcast reference signal while sending the PDSCH; wherein the PDSCH is mapped to resource elements not occupied by the simulcast reference signal.
The sending apparatus of MBMS service provided in this embodiment is used in the technical solution of the foregoing method embodiment, and its technical effect and implementation principle are similar, and are not described herein again.
Fig. 5 is a schematic structural diagram of a MBMS service transmission system according to an embodiment of the present invention, as shown in fig. 5, an MCE and at least one base station; each base station may control at least one cell in the simulcast area, i.e. each base station may correspond to one or more cells.
The MCE is used for:
determining a simulcast area and configuration information of a first Multimedia Broadcast Multicast Service (MBMS); the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS service, a first bandwidth occupied by a Physical Downlink Shared Channel (PDSCH) of the first MBMS service and a first coding modulation method are sent in the simulcast subframe;
sending the ID of the first MBMS service and the configuration information to each cell in the simulcast area;
the at least one base station is configured to:
and sending the first MBMS service through PDSCH in the cell in the simulcast region according to the ID of the first MBMS service and the configuration information.
The MBMS service transmission system provided in this embodiment is used to implement the technical solution of the foregoing method embodiment, and the technical effect and the implementation principle are similar, which are not described herein again.
Fig. 6 is a schematic structural diagram of an embodiment of an MCE provided in the present invention, and as shown in fig. 6, the MCE may be specifically implemented to include: a processor for controlling execution of the executable instructions, a memory for storing processor-executable instructions, and a transmitter for transmitting a message;
wherein the processor is specifically configured to:
determining a simulcast area and configuration information of a first Multimedia Broadcast Multicast Service (MBMS); the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS service, a first bandwidth occupied by a Physical Downlink Shared Channel (PDSCH) of the first MBMS service and a first coding modulation method are sent in the simulcast subframe;
the transmitter is specifically configured to: and sending the identification ID of the first MBMS service and the configuration information to each cell in the simulcast area.
The MCE may be provided separately or in the base station. It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (11)

1. A method for transmitting MBMS service is characterized by comprising the following steps:
determining a simulcast area and configuration information of a first Multimedia Broadcast Multicast Service (MBMS); the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS service, a first bandwidth occupied by a Physical Downlink Shared Channel (PDSCH) of the first MBMS service and a first coding modulation method are sent in the simulcast subframe;
sending the ID of the first MBMS service and the configuration information to each cell in the simulcast area;
and sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information.
2. The method of claim 1, wherein the first bandwidth is used to indicate at least one consecutive Resource Block (RB) occupied by the PDSCH.
3. The method according to claim 1 or 2, wherein the configuration information further includes the number of antenna ports and physical layer cell identity for each cell transmitting cell reference signal, CRS, within the simulcast region; determining that the configuration information further comprises:
acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
then, sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information includes:
transmitting the first MBMS service through PDSCH in the simulcast subframe; wherein the PDSCH is mapped to resource elements not occupied by CRS of each cell within the simulcast region in at least one consecutive RB indicated by the first bandwidth.
4. The method according to claim 1 or 2, wherein the configuration information further includes the number of antenna ports and physical layer cell identity for each cell transmitting cell reference signal, CRS, within the simulcast region; determining that the configuration information further comprises:
acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
then, sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information includes:
configuring a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB of the first bandwidth indication;
the first MBMS service is sent through a PDSCH in the simulcast subframe, and the simulcast reference signal is sent while the PDSCH is sent; wherein the simulcast reference signal is mapped to resource elements not occupied by CRS of each cell in the simulcast region; and mapping the PDSCH to resource units which are not occupied by the CRS and the simulcast reference signal of each cell in the simulcast region.
5. The method according to claim 1 or 2, wherein the configuration information further comprises: a first indication to indicate that each cell within the simulcast region does not transmit CRS on at least one consecutive RB of the first bandwidth indication;
then, sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information includes:
configuring a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB of the first bandwidth indication;
the first MBMS service is sent through a PDSCH in the simulcast subframe, and the simulcast reference signal is sent while the PDSCH is sent; wherein the PDSCH is mapped to resource elements not occupied by the simulcast reference signal.
6. A transmitting apparatus for an MBMS service, comprising:
the processing module is used for determining a simulcast area and configuration information of a first Multimedia Broadcast Multicast Service (MBMS); the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS service, a first bandwidth occupied by a Physical Downlink Shared Channel (PDSCH) of the first MBMS service and a first coding modulation method are sent in the simulcast subframe;
a first sending module, configured to send the identifier ID of the first MBMS service and the configuration information to each cell in the simulcast area;
and the second sending module is used for sending the first MBMS service through the PDSCH according to the ID of the first MBMS service and the configuration information.
7. The apparatus of claim 6, wherein the first bandwidth determined by the processing module is used to indicate at least one consecutive Resource Block (RB) occupied by the PDSCH.
8. The apparatus according to claim 6 or 7, wherein the configuration information further includes the number of antenna ports and physical layer cell identity for each cell transmitting Cell Reference Signal (CRS) within the simulcast region; the processing module is further configured to: acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
the second sending module is specifically configured to: transmitting the first MBMS service through PDSCH in the simulcast subframe; wherein the PDSCH is mapped to resource elements not occupied by CRS of each cell within the simulcast region in at least one consecutive RB indicated by the first bandwidth.
9. The apparatus according to claim 6 or 7, wherein the configuration information further includes the number of antenna ports and physical layer cell identity for each cell transmitting Cell Reference Signal (CRS) within the simulcast region; the processing module is further configured to: acquiring the number of antenna ports and physical layer cell identification of CRS (cell-specific reference signal) sent by each cell in the simulcast region;
the second sending module specifically includes:
a first processing unit, configured to configure a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB indicated by the first bandwidth;
a first sending unit, configured to send the first MBMS service through a PDSCH in the simulcast subframe, and send the simulcast reference signal while sending the PDSCH; wherein the simulcast reference signal is mapped to resource elements not occupied by CRS of each cell in the simulcast region; and mapping the PDSCH to resource units which are not occupied by the CRS and the simulcast reference signal of each cell in the simulcast region.
10. The apparatus of claim 6 or 7, wherein the configuration information further comprises: a first indication to indicate that each cell within the simulcast region does not transmit CRS on at least one consecutive RB of the first bandwidth indication;
then according to the second sending module comprising:
a second processing unit, configured to configure a simulcast reference signal for the PDSCH demodulation on at least one consecutive RB indicated by the first bandwidth;
a second sending unit, configured to send the first MBMS service through a PDSCH in the simulcast subframe, and send the simulcast reference signal while sending the PDSCH; wherein the PDSCH is mapped to resource elements not occupied by the simulcast reference signal.
11. A system for transmitting an MBMS service, comprising: a multi-cell/multicast coordination network element MCE and at least one base station;
the MCE is used for:
determining a simulcast area and configuration information of a first Multimedia Broadcast Multicast Service (MBMS); the simulcast area is composed of a plurality of adjacent cells; the configuration information includes: a simulcast subframe of the first MBMS service, a first bandwidth occupied by a Physical Downlink Shared Channel (PDSCH) of the first MBMS service and a first coding modulation method are sent in the simulcast subframe;
sending the ID of the first MBMS service and the configuration information to each cell in the simulcast area;
the at least one base station is configured to:
and sending the first MBMS service through PDSCH in the cell in the simulcast region according to the ID of the first MBMS service and the configuration information.
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