CN101291237A - Downlink data transmission method and apparatus for multicast and broadcast service - Google Patents
Downlink data transmission method and apparatus for multicast and broadcast service Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for transmitting multimedia broadcast multicast service (MBMS) downgoing data, comprising the following steps that: the data to be transmitted is classified; the classified data is modulated in a way of multiple code words; and the data after the multiple-code word modulation is multiplexed on the same time-frequency resource block to be transmitted. The embodiment of the invention also discloses an MBMS downgoing data transmitting device. The method and the device are utilized to increase the system thuoughput and improve the anti-interference performance in the process of transmitting the data.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of multimedia broadcast/multicast service (MBMS, Multimedia Broadcast/Multicast Service) downlink data transmission technology.
Background technology
Internet Protocol (IP) multicast and broadcast technology are meant that traditional IP multicast and broadcasting mostly are the business based on phone and message from the data receiver formula of a data source to a plurality of targets transmission datagrams.Such as, cell broadcaste service (CBS), CBS allow to share broadcast channel by the sub-district and send low bit rate data to all users, and this business is message based business.
Along with rapid network development, people not only have been satisfied with phone and messaging service for the demand of mobile communication, and a large amount of multimedia services continue to bring out out.In the some of them applied business, a plurality of users can receive identical data simultaneously, such as video request program, television broadcasting, video conference, online education and interactive game etc.These multimedia service datas are compared with the traditional business data, have that data volume is big, characteristics such as longer duration and delay sensitive.Just because of the mobile network has network configuration, functional entity and the wave point carrying of the traditional IP of being different from, make traditional IP multicast and broadcast technology can't satisfy the demand that the mobile subscriber shares mobile network resource.
So for effectively utilizing mobile network resource, Wideband Code Division Multiple Access (WCDMA) (WCDMA)/global system for mobile communications (GSM) global standardsization organize third generation partner plan (3GPP) to propose MBMS.MBMS is meant that a data source sends the point-to-multipoint service of data to a plurality of users, can realize comprising mobile core network and access network resource, and the Internet resources of the interface resource of especially eating dishes without rice or wine are shared.And MBMS not only can realize the classes of messages multicast and the broadcasting of plain text low rate, can also realize the multimedia service multicast and the broadcasting of two-forty.
In the prior art, dual mode is adopted in the realization of MBMS usually:
In first kind of mode, at first the MBMS data are divided into master data and high end data two classes, wherein, master data is mainly and makes low end subscriber finish basic receiving function; High end data then is mainly used in for high-end user provides diversified service, such as the user that pays the fees.At the MBMS transmitting terminal, master data and the high end data mode by hierarchical modulation is distinguished, and launch, correspondingly, the user of different brackets receives corresponding data separately and is demodulated to the data that self need.
But there is a defective in this mode, is exactly that throughput of system is not high, because the space dimensionality that system utilized is many more in principle, throughput is corresponding just high more, and this mode peacekeeping sign indicating number dimension space when only having utilized, fail to utilize frequency dimension space commonly used, so cause throughput of system lower.
So, another kind of MBMS implementation has been proposed in the prior art, this mode is applied to multiple-input and multiple-output (MIMO) technology among the MBMS.
Here said MIMO technology is meant at transmitting terminal and receiving terminal a plurality of transmitting antennas and reception antenna is set respectively, after the transmission and reception of signal by a plurality of antennas of transmitting terminal and receiving terminal, improves a kind of technology of each quality of services for users.For traditional a single aerial system, the MIMO technology can improve the availability of frequency spectrum greatly, and the data service of higher rate can be transmitted in the system that makes under the limited wireless frequency band.Concentrate on mostly in the environment of single user's point-to-point about the MIMO Study on Technology in early days, demand along with technical development, current, people transfer to research emphasis in the multiuser MIMO channel circumstance gradually, increase throughput of system by employing space division multiple access (SCDMA) in the down link of multi-user MIMO system.Under this applied environment, because exist a plurality of users, so need design emission vector eliminating the common-channel interference between the user, the method for common-channel interference comprises block diagonalization, optimization and Space Time Coding etc. one by one between elimination user commonly used.
Based on above-mentioned MIMO technology, existing another kind of MBMS implementation is: at first the MBMS data are divided into master data and high end data two classes, then, utilize the MIMO technology that master data is sent by different time with high end data, that is to say, master data and high end data are segmented on the dimension of a plurality of spaces by time-frequency transmit.
In the aforesaid way, master data and high end data have been carried out cutting apart of running time-frequency resource, like this, master data and high end data are sent separately, and the throughput of system is still lower.
Summary of the invention
In view of this, the technical problem that the embodiment of the invention mainly solves is to provide a kind of MBMS downlink data transmission method, can improve throughput of system.
Another technical problem that mainly solves of the embodiment of the invention is to provide a kind of MBMS downlink data dispensing device, can improve throughput of system.
For achieving the above object, the technical scheme of the embodiment of the invention is achieved in that
A kind of multimedia broadcast/multicast service MBMS downlink data transmission method, this method may further comprise the steps:
Data to be sent are classified; Described sorted data are carried out many code word modulation; Described data multiplex after too much code word modulation is sent on same time.
A kind of MBMS downlink data dispensing device, this device comprises: sort module, many code words modulation module and Multiplexing module;
Described sort module is used for data to be sent are classified, and described sorted data are sent to described many code words modulation module;
Described many code words modulation module is used to receive the sorted data from described sort module, and described sorted data are carried out many code word modulation and are sent to Multiplexing module;
Described Multiplexing module is used to receive the data after too much code word modulation from described many code words modulation module, and described data multiplex after too much code word modulation is sent on same time.
As seen, adopt the technical scheme of the embodiment of the invention, sorted master data and high end data are carried out coded modulation respectively, guaranteed the reception of user master data by many code words modulation technique; And, to on same time, send through all data multiplexs after the too much code word modulation in the scheme of the present invention, make high-end user within a time, can receive sorted all data simultaneously, thereby improved the throughput of high-end user, further improved throughput of system.
Description of drawings
Fig. 1 is the flow chart of the MBMS downlink data transmission method of the embodiment of the invention;
Fig. 2 is the flow chart of the MBMS downlink data transmission method of preferred embodiment of the present invention;
Fig. 3 be under the embodiment of the invention MIMO radiation pattern with existing MIMO radiation pattern under user and throughput of system schematic diagram;
Fig. 4 is the composition structural representation of the MBMS downlink data dispensing device of the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Fig. 1 is the flow chart of embodiment of the invention MBMS downlink data transmission method.As shown in Figure 1, may further comprise the steps:
Step 101: data to be sent are classified.
In this step, data sending terminal, promptly the base station end is at first classified MBMS data to be sent, is divided into master data and high end data two classes.Wherein, master data is for being used to satisfy user's basic service demand, and all use receivable data per family, such as, broadcast message and monochrome television signal etc.; High end data is the high-end user setting then, and being mainly used in provides fee payment service etc.
Step 102: sorted data are carried out many code word modulation.
In this step, by many code words technology, promptly a kind of technology of encoding respectively at different code streams is carried out coded modulation respectively to master data and high end data.
Wherein, master data and high end data can adopt identical coded modulation grade, also can adopt different coded modulation grades.The change of coded modulation grade can realize by changing encoder bit rate or changing order of modulation.Such as, in this step, can use the Turbo code of same code rate or low density parity check code (LDPC) that master data and high end data are carried out coded modulation respectively; Perhaps, use the Turbo code of 1/4 code check that master data is carried out coded modulation, use the Turbo code of 1/3 code check that high end data is carried out coded modulation.
Step 103: will on same time, send through the data multiplex after the too much code word modulation.
In this step, the base station end adopts space division multiplexing (SDMA) technology of MIMO, and sorted master data and high-end data multiplex are sent on same time.
Here the SDMA technology of the MIMO that is mentioned is a kind of communication pattern, and it utilizes the directivity of teledish to optimize the use of wireless frequency-domain and reduce system cost, utilizes space segmentation to constitute different channels.SDMA is a kind of mode of channel increase-volume, can realize the repeated use of frequency, makes full use of frequency resource.This technology is a prior art, does not describe in detail herein.
This method can further comprise: the multiplexing data that send on same time are carried out precoding processing, thereby reduce the interference between each data flow.
Precoding technique comprises: multiply by a quadrature or non-orthogonal pre-coding matrix with the data after the modulation, this pre-coding matrix is made up of the precoding vector of corresponding dimension, and the vector data after will multiplying each other is mapped on the antenna and launches; Correspondingly, user side receives and demodulates required separately data.
The state of used pre-coding matrix can be configured to dynamic or semi-static change in the embodiment of the invention, that is to say, used pre-coding matrix is not changeless.Here said dynamic or semi-static, be meant every the regular hour pre-coding matrix and will once change automatically that it is different that dynamic with semi-static difference is to change frequency.Wherein, changing frequency pre-sets for the prior art kind.And the base station end can be notified user side with precoding vector by modes such as signaling or dedicated pilots, so that user side carries out demodulation according to the precoding vector that receives.
Fig. 2 is the flow chart of the MBMS downlink data transmission method of preferred embodiment of the present invention.As shown in Figure 2, may further comprise the steps:
Step 201: with MBMS data qualification to be sent is master data and high end data.
In this step, the base station end is classified MBMS data to be sent, is categorized as master data and high end data.
Step 202: use the Turbo code of 1/4 code check that master data is carried out coded modulation, use the Turbo code of 1/3 code check that high end data is carried out coded modulation.
For guaranteeing of the reception of low end subscriber to master data, adopt many code words technology of MIMO in this step, master data is modulated according to different coded modulation grades respectively with high end data.
Wherein, the coded system of Turbo code is a prior art.Because the Turbo encoder generally all is made up of by an interleaver parallel cascade two recursive convolutional encoder devices (RSC), so Turbo code is also referred to as Parallel Concatenated Convolutional Code (PCCC).The code check of Turbo code can be 1/2,1/3 and 1/4 etc., can realize the variation of different code checks by punchinging.
Step 203:, will through the master data after the coded modulation and high-end data multiplex on same time, send by the space division multiplexing mode of MIMO.
Step 204: multiplexing master data that sends on same time and high end data are carried out precoding processing.
This step is in order to reduce the interference between the different data streams.Wherein, the state of pre-coding matrix can be configured to dynamic or semi-static change.And in the precoding processing process, transmitting terminal can be notified user side with precoding vector by modes such as signaling or dedicated pilots, so that user side carries out demodulation according to the precoding vector that receives.
After above-mentioned steps 201～204 processing, comprise that simultaneously the MBMS data of master data and high end data are launched into user side through antenna.Correspondingly, the user side reception antenna receives each self-corresponding data.Suppose that the base station end is provided with 4 transmitting antennas in the present embodiment, user side is provided with 3 reception antennas, and wherein 2 is the high-end user reception antenna, and 1 is low end subscriber reception antenna.So, in the present embodiment, master data and high end data arrive user side through 4 transmission antennas transmit; 2 high-end user reception antennas of user side receive master data and high end data simultaneously; Low end subscriber reception antenna receives master data.Like this, for low end subscriber, only detect a data flow within the time, and, can detect two data flow within the time, thereby make the throughput of high-end user increase for high-end user, further, make the throughput of whole system be increased.
Fig. 3 be under the embodiment of the invention MIMO radiation pattern with existing MIMO radiation pattern under user and throughput of system schematic diagram.This figure is provided with 4 transmitting antennas at hypothesis base station end, and user side is provided with 3 reception antennas, and wherein 2 is the high-end user reception antenna, and 1 is low end subscriber reception antenna; And transmitting antenna adopts 48 available subcarriers, obtains under the situation that the OFDM mode of 8 OFDMs (OFDM) symbol is launched.
As shown in Figure 3, abscissa is wherein represented signal to noise ratio; Broken line 1,2 and 3 is represented the high-end user under the MIMO radiation pattern of the present invention, low end subscriber and throughput of system respectively; Broken line 4,5 and 6 is represented the high-end user under the existing MIMO radiation pattern, low end subscriber and throughput of system respectively.As can be seen, the described method of the embodiment of the invention has significantly improved throughput of system.
Based on said method, Fig. 4 is the composition structural representation of the MBMS downlink data dispensing device of the embodiment of the invention.As shown in Figure 4, this device comprises: sort module 401, many code words modulation module 402 and Multiplexing module 403.
Sort module 401 is used for data to be sent are classified, and sorted data is sent to many code words modulation module 402;
Many code words modulation module 402 is used to receive the sorted data from sort module 401, and sorted data are carried out many code word modulation and are sent to Multiplexing module 403;
Multiplexing module 403 is used to receive the data after too much code word modulation from many code words modulation module 402, and will sends on same time through the data multiplex after the too much code word modulation.
Wherein, classified data packages is drawn together master data and high end data two classes, and correspondingly, many code words modulation module 402 specifically comprises: first code modulation module 4021 and second code modulation module 4022.
First code modulation module 4021 is used to receive the master data from sort module 401, and master data is carried out coded modulation and is sent to Multiplexing module 403;
Second code modulation module 4022 is used to receive the high end data from sort module 401, and high end data is carried out coded modulation and is sent to Multiplexing module 403;
Above-mentioned first code modulation module 4021 and second code modulation module 4022 can adopt identical or different coded modulation grade to carry out coded modulation.
This device also can further comprise: precoding module 404, be used to receive the multiplexing data that on same time, send from Multiplexing module 403, these data are carried out precoding processing, and by antenna transmission to user side.
As seen, adopt the technical scheme of the embodiment of the invention, sorted master data and high end data are carried out coded modulation respectively, guaranteed the reception of user master data by many code words modulation technique; And, in the described scheme of the embodiment of the invention master data and high-end data multiplex are sent on same time, make high-end user within a time, can receive two class data simultaneously, thereby improved the throughput of high-end user, further improved throughput of system.And the described scheme of the embodiment of the invention is carried out precoding processing to the multiplexing data that send on same time, reduced the interference between the different data streams, has improved the anti-interference of elementary stream.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, a kind of multimedia broadcast/multicast service MBMS downlink data transmission method is characterized in that this method may further comprise the steps:
Data to be sent are classified; Described sorted data are carried out many code word modulation; Described data multiplex after too much code word modulation is sent on same time.
2, method according to claim 1 is characterized in that, described classified data packages is drawn together master data and high end data two classes.
3, method according to claim 2 is characterized in that, the described method that described sorted data are carried out the modulation of many code words is:
Use different coded modulation grades that described master data and high end data are carried out coded modulation respectively.
4, method according to claim 2 is characterized in that, the described method that described sorted data are carried out the modulation of many code words is:
Use identical coded modulation grade that described master data and high end data are carried out coded modulation respectively.
5, method according to claim 1 is characterized in that, the described method that described data multiplex after too much code word modulation is sent on same time is:
Adopt the space division multiplexing mode, described data multiplex after too much code word modulation is sent on same time.
6, according to each described method in the claim 1 to 5, it is characterized in that, described multiplexing data on same time are sent before, this method further comprises:
Described multiplexing data on same time are carried out precoding processing.
7, method according to claim 6 is characterized in that, the pre-coding matrix state in the described precoding processing process is dynamic or semi-static change.
8, method according to claim 6 is characterized in that, described precoding processing process further comprises: adopt signaling or dedicated pilot to be notified to user side the precoding vector in the precoding processing process.
9, a kind of MBMS downlink data dispensing device is characterized in that this device comprises: sort module, many code words modulation module and Multiplexing module;
Described sort module is used for data to be sent are classified, and described sorted data are sent to described many code words modulation module;
Described many code words modulation module is used to receive the sorted data from described sort module, and described sorted data are carried out many code word modulation and are sent to Multiplexing module;
Described Multiplexing module is used to receive the data after too much code word modulation from described many code words modulation module, and described data multiplex after too much code word modulation is sent on same time.
10, device according to claim 9 is characterized in that, described classified data packages is drawn together master data and high end data two classes; Described many code words modulation module specifically comprises: first code modulation module and second code modulation module;
Described first code modulation module is used to receive the master data from described sort module, and described master data is carried out coded modulation and is sent to Multiplexing module;
Described second code modulation module is used to receive the high end data from described sort module, and described high end data is carried out coded modulation and is sent to Multiplexing module;
Described first code modulation module and described second code modulation module adopt identical or different coded modulation grade to carry out coded modulation.
11, according to claim 9 or 10 described devices, it is characterized in that this device further comprises: precoding module is used to receive the multiplexing data on same time from described Multiplexing module, described data are carried out precoding processing, and be sent to user side.
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| CNA2007101014533A CN101291237A (en) | 2007-04-18 | 2007-04-18 | Downlink data transmission method and apparatus for multicast and broadcast service |
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| CNA2007101014533A CN101291237A (en) | 2007-04-18 | 2007-04-18 | Downlink data transmission method and apparatus for multicast and broadcast service |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010142130A1 (en) * | 2009-06-12 | 2010-12-16 | 中兴通讯股份有限公司 | Method for determining modulation and coding scheme of multimedia broadcast multicast service and system thereof |
| CN102104833A (en) * | 2009-12-18 | 2011-06-22 | 上海贝尔股份有限公司 | MBMS service transmission method and system based on layered modulation scheme |
| CN104184672A (en) * | 2014-09-10 | 2014-12-03 | 四川九洲电器集团有限责任公司 | Method and device of transmitting message |
| WO2017193932A1 (en) * | 2016-05-10 | 2017-11-16 | 华为技术有限公司 | Communication method and network device thereof, and user equipment |
-
2007
- 2007-04-18 CN CNA2007101014533A patent/CN101291237A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010142130A1 (en) * | 2009-06-12 | 2010-12-16 | 中兴通讯股份有限公司 | Method for determining modulation and coding scheme of multimedia broadcast multicast service and system thereof |
| CN102104833A (en) * | 2009-12-18 | 2011-06-22 | 上海贝尔股份有限公司 | MBMS service transmission method and system based on layered modulation scheme |
| CN104184672A (en) * | 2014-09-10 | 2014-12-03 | 四川九洲电器集团有限责任公司 | Method and device of transmitting message |
| WO2017193932A1 (en) * | 2016-05-10 | 2017-11-16 | 华为技术有限公司 | Communication method and network device thereof, and user equipment |
| CN107360626A (en) * | 2016-05-10 | 2017-11-17 | 华为技术有限公司 | Communication means and its network equipment, user equipment |
| CN107360626B (en) * | 2016-05-10 | 2020-05-08 | 华为技术有限公司 | Communication method, network equipment and user equipment thereof |
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