CN101686434A - MBMS transmission feedback method, system and devices - Google Patents
MBMS transmission feedback method, system and devices Download PDFInfo
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- CN101686434A CN101686434A CN200810223630A CN200810223630A CN101686434A CN 101686434 A CN101686434 A CN 101686434A CN 200810223630 A CN200810223630 A CN 200810223630A CN 200810223630 A CN200810223630 A CN 200810223630A CN 101686434 A CN101686434 A CN 101686434A
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Abstract
The present invention discloses an MBMS transmission feedback method comprising steps that a terminal receives MBMS services sent by a base station, the MBMS services are sent in a mode of OFDM modulation, an interval between sub-carriers of the OFDM modulation is T; the terminal selects an interval between sub-carriers equal to or larger than T and sends feedback information to the base station.The present invention also provides an MBMS transmission feedback system and devices. By adopting the technical solution of the invention, information is fed back by selecting bigger interval betweensub-carriers, therefore, frequency domain interfere of the system can be reduced and the whole performance of the system can be improved.
Description
Technical field
The present invention relates to moving communicating field, particularly, the present invention relates to the MBMS technical field of mobile communication.
Background technology
In order to effectively utilize the mobile communications network resource, 3GPP (3rd Generation PartnershipProject, third generation partner program) MBMS (the MultimediaBroadcast Multicast Service of mobile communications network has been proposed, multimedia broadcast-multicast service), thereby in mobile communications network, provide a data source to send the point-to-multipoint service of data to a plurality of users, the realization Internet resources are shared, improve utilization rate of network resource, the sharing of the interface resource of especially eating dishes without rice or wine.
The MBMS that 3GPP proposes can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can also realize the multicast and the broadcasting of high-speed multimedia business.In order further to improve the transmission performance of MBMS, at the LTE of 3GPP (LongTerm Evolution, Long Term Evolution) in the system, the various situations of supporting the MBMS business are defined, for example, transmission method comprises mixed carrier transmission and special carrier transmission, in addition, the LTE system also supports Frequency Division Duplexing (FDD) and two kinds of dual-modes of time division duplex, and two kinds of dual-modes use different frame structures.For tdd systems, each radio frames is made of the long subframe of 10 1ms, and each subframe is numbered from 0～9 in order.As shown in table 1, be the transformat of the various configurations that system supported.
Table 1 uplink and downlink frame configuring condition
In table 1; " D " represents that this subframe is used for downlink transfer; " U " represents that this subframe is used for uplink; " S " represents special subframe, comprising: " DwPTS ", " GP "; " UpPTS " three zones; wherein DwPTS is used to transmit descending master sync signal and generic downlink business datum, and GP is the protection interval, and UpPTS takies 1～2 OFDM symbol transmission uplink random and inserts signal and uplink detection signal.
The principal character of MBMS business is that data volume is big, real-time, wide coverage etc., in the tdd systems of LTE, use OFDM modulation carrying out MBMS transmission, the subcarrier spacing of descending MBMS business is the system of 7.5kHz, its anti-time domain interference capability is stronger, but the resolution capability to multipath is relatively poor, and promptly anti-frequency domain interference ability is relatively poor.When by the special carrier MBMS transmission, time delay between its multipath will compare when general data is professional to be transmitted big, terminal is easier to tell the signal on each paths, therefore use the subcarrier spacing of 7.5kHz can be under the prerequisite that does not influence its frequency domain interference free performance, better the antagonism time domain is disturbed, and improves the overall performance of system.It is professional based on the unidirectional transmission of descending broadcast group broadcast that traditional MBMS business is generally, owing to do not possess feedback function, so transmitting terminal is not understood the concrete condition of receiving terminal usually.In addition, at the characteristics of mobile communication system self, when in some system, having a large amount of downlink resources, also exist the configuring condition of a spot of ascending resource.
Therefore, be necessary to propose a kind of up feedback method of effective MBMS transmission.
Summary of the invention
The problem to be solved in the present invention is feedback method, system and the equipment that proposes a kind of MBMS transmission, solves the feedback problem in the MBMS business.
For achieving the above object, the invention discloses a kind of feedback method of MBMS transmission, the choose reasonable transmission means is utilized a small amount of ascending resource in the system, realizes the up feedback of user terminal, thereby improves the overall performance of system.
The invention discloses a kind of feedback method of MBMS transmission, may further comprise the steps:
Terminal receives the MBMS business that the base station sends, and described MBMS business sends with the OFDM modulation system, and the subcarrier spacing of described OFDM modulation is T;
The subcarrier spacing that described terminal is selected to be equal to or greater than T sends to described base station with feedback information.
According to embodiments of the invention, the uplink and downlink communication between described terminal and the described base station is a TDD mode, and up-downgoing service subframe ratio is less than 1.
According to embodiments of the invention, the MBMS business that described terminal receives the base station transmission comprises:
Described base station sends the MBMS business to described terminal on special carrier, all the downlink business subframes in the described special carrier are used for the MBMS transmission.
According to embodiments of the invention, described terminal sends feedback information to described base station on special carrier, and all the uplink service subframes in the described special carrier are used for transmitting feedback information.
According to embodiments of the invention, the subcarrier spacing T that described MBMS transmission is used comprises 7.5kHz.
According to embodiments of the invention, described terminal is fed back employed subcarrier spacing and is comprised 15kHz.
According to embodiments of the invention, described feedback information comprises the link circuit self-adapting feedback information.
According to embodiments of the invention, described link circuit self-adapting feedback information comprises channel quality information, re-transmission indication information and the pre-coding matrix information of the MBMS business that described terminal receives.
According to embodiments of the invention, described feedback information comprises managed operation information.
According to embodiments of the invention, described managed operation information comprises authentication information, customer satisfaction survey information and the charging statistical information of described terminal.
According to embodiments of the invention, described feedback information comprises the feedback information based on the MBMS business tine.
The invention also discloses a kind of reponse system of MBMS transmission, comprising:
The base station, described base station sends the MBMS business to terminal, and described MBMS business sends with the OFDM modulation system, and the subcarrier spacing of described OFDM modulation is T;
Terminal, described terminal receive the MBMS business that described base station sends, and use the subcarrier spacing that is equal to or greater than T that feedback information is sent to described base station in up channel.
The invention also discloses a kind of terminal equipment, comprising:
Receiver module, described receiver module are used to receive the MBMS business that the base station sends, and described MBMS business sends with the OFDM modulation system, and the subcarrier spacing of described OFDM modulation is T;
Sending module, described sending module are used for sending feedback information to described base station;
Configuration module, described configuration module is used to select to send the subcarrier spacing of feedback information, and the subcarrier spacing of selecting to be equal to or greater than T sends to described base station by described sending module.
According to embodiments of the invention, the subcarrier spacing of the OFDM modulation that described receiver module receives is 7.5kHz, and the subcarrier spacing of the 15kHz that described configuration module is selected sends to described base station with feedback information by described sending module.
According to embodiments of the invention, the feedback information that described sending module sends comprises:
Link circuit self-adapting feedback information, managed operation information and based on the feedback information of MBMS business tine.
Because at present traditional MBMS transmission is generally unidirectional broadcast group broadcast and sends business, lacks effective feedback mechanism, the present invention has proposed a kind of feedback method, system and equipment with MBMS transmission of feedback mechanism according to the characteristics of mobile communication system self.Technical scheme of the present invention has the following advantages, and both can provide descending multi-media broadcasting service at a high speed to the user, has also made full use of the downlink resource in the system, avoids the wasting of resources that causes owing to the descending sub frame free time.In addition, carry out feedback information, reduce the frequency domain interference of system, improve the overall performance of system by selecting bigger subcarrier spacing.The terminal feedback information helps the abundant business type, simultaneously for operation management brings convenience, helps further optimization system performance.
Description of drawings
Fig. 1 is the feedback method flow chart of MBMS transmission;
The reference symbol mapping structure of using when Fig. 2 transmits for special carrier MBMS;
Fig. 3 is the schematic diagram of the reponse system transceiver of MBMS transmission;
Fig. 4 is the illustrative view of functional configuration of MBMS feedback terminal equipment.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
The feedback method of MBMS transmission disclosed by the invention may further comprise the steps: terminal receives the MBMS business that the base station sends, and described MBMS business sends with the OFDM modulation system, and the subcarrier spacing of described OFDM modulation is T; The subcarrier spacing that described terminal is selected to be equal to or greater than T sends to described base station with feedback information.
As shown in Figure 1, for realizing the flow chart of the feedback method that MBMS of the present invention transmits.
S101, receiving MBMS service by terminal.
The principal character of MBMS business is that data volume is big, real-time, wide coverage etc.As embodiments of the invention, describe the present invention for example in detail with the MBMS business in the LTE system below.In the LTE system, stipulated two kinds of different subcarrier spacings: 15kHz and 7.5kHz, wherein 7.5kHz only is used for MBMS special carrier transmission use.Under the different condition, each time domain is long to be that parameter in the Physical Resource Block of 180kHz is as shown in table 2 below for 1ms, frequency domain are wide.
Table 2 configuration parameter
In the LTE system, always be to use expansion CP (Extended CyclePrefix, Cyclic Prefix) when carrying out the MBMS transmission, and transmission bandwidth takes whole frequency band.The LTE system supports two kinds of MBMS transmission methods: mixed carrier transmission and special carrier transmission.During the mixed carrier transmission, have MBMS and non-MBMS/unicast business simultaneously on a certain time-frequency band, this moment, subcarrier spacing was 15kHz; During the special carrier transmission, then only have the MBMS business on a certain time-frequency band, this moment, subcarrier spacing was 7.5kHz.For special carrier MBMS transmission, the mapping structure of its reference symbol on Physical Resource Block as shown in Figure 2, R wherein
4When transmitting for MBMS, receiving terminal carries out the employed reference symbol of channel estimating, i.e. frequency pilot sign.
As embodiments of the invention, described terminal receives the downlink transfer resource that the base station sends, and sends the uplink transmission resource of information to described base station greater than described terminal.More specifically, the uplink and downlink communication between terminal and the base station is a TDD mode, and up-downgoing service subframe ratio is less than 1.Exist a large amount of downlink resource in the system this moment, also exists the configuring condition of a spot of ascending resource.Therefore, utilize a spot of ascending resource can realize having the MBMS transmission mechanism of up feedback function.
As embodiments of the invention, the base station sends the MBMS business to terminal on special carrier, and all downlink business subframes of special carrier are used for the MBMS transmission.
Correspondingly, terminal sends feedback information to described base station on special carrier, because the uplink service subframe of special carrier is less, so all the uplink service subframes in the special carrier are used for transmitting feedback information.
In the above-described embodiments, this system can work independently and not need other carrier waves to cooperate, promptly in the special carrier frequency range, comprise: synchronizing channel, MBMS control channel, MBMS paging channel, Random Access Channel etc., each channel can adopt the mode of the definition of existing standard to carry out work, but also otherwise designed.
As embodiments of the invention, the up feedback of terminal can be used and be less than or equal to descending MBMS and transmit employed bandwidth resources.When up feedback bandwidth during less than descending MBMS transmission bandwidth, the remaining frequencies resource can be used by other system in the uplink service subframe.Preferably, terminal is the feedack size as required, selects suitable uplink bandwidth resource to transmit transmission.
As shown in table 1, the LTE system supports the MBMS transmission under the various modes at present.As embodiments of the invention, can adopt uplink and downlink communication is TDD mode, and the up-downgoing service subframe is configured to the transformat of 1: 9 pattern, i.e. the transformat of configuration 5 in the table 1.
S102, terminal is selected suitable subcarrier spacing, sends feedback information.
After terminal receives the MBMS business, be chosen in feedback information in the suitable uplink bandwidth resource that system is required and send to the base station.
In the above-described embodiments, when the subcarrier spacing of downlink transfer was 7.5kHz, its anti-time domain interference capability was stronger, but relatively poor to the resolution capability of multipath, and promptly anti-frequency domain interference ability is relatively poor.Because during special carrier MBMS transmission, time delay between its multipath will compare when general data is professional to be transmitted big, terminal is easier to tell the signal on each paths, therefore use the subcarrier spacing of 7.5kHz can be under the prerequisite that does not influence its frequency domain interference free performance, better the antagonism time domain is disturbed, and improves the overall performance of system.
Yet for up feedback signal, same base station is received from time delay between the multipath signal of same terminal less, therefore needs to use bigger subcarrier spacing, to guarantee the frequency domain interference free performance of system.
As embodiments of the invention, the subcarrier spacing that terminal is selected to be equal to or greater than 7.5kHz sends to described base station with feedback information, and for example, the subcarrier spacing of 15kHz or several times are in the subcarrier spacing of 7.5kHz.
As embodiments of the invention, the feedback information of terminal comprises:
The feedback information that is used for link circuit self-adapting, for example: the channel quality information of the required use of Adaptive Modulation and Coding, HARQ (Hybrid Automatic Repeat reQuest, mixed automatic repeat request) retransmit indication information and pre-coding matrix information etc.;
Based on the feedback information of business tine, for example: user's ballot, user's message etc.;
The needed feedback information of operation management, for example: authentication information, customer satisfaction survey information and charging statistical information etc.
The present invention also provides a kind of reponse system of MBMS transmission, comprising:
The base station, described base station sends the MBMS business to terminal, and described MBMS business sends with the OFDM modulation system, and the subcarrier spacing of described OFDM modulation is T;
Terminal, described terminal receive the MBMS business that described base station sends, and the subcarrier spacing of selecting to be equal to or greater than T in up channel sends to described base station with feedback information.
As shown in Figure 3, be an embodiment of said system.In the present embodiment, the subcarrier spacing that base station 210 sends the MBMS business is 7.5kHz, and up channel selects the subcarrier of 15kHz to feed back to terminal 220.In the present embodiment, because the sampling rate difference of up-downgoing transmission, so the frequency that R-T unit adopts also is different.Need the transmitter of configuration 7.5kHz and the receiver of 15kHz for base station 210, and terminal 220 needs the transmitter of configuration 15kHz and the receiver of 7.5kHz.
As shown in Figure 4, the invention also discloses a kind of terminal equipment 220, comprising:
Sending module 221, sending module 221 are used for sending feedback information to the base station;
As embodiments of the invention, the subcarrier spacing of the OFDM modulation that receiver module 223 receives is 7.5kHz, and the subcarrier spacing of the 15kHz that configuration module 222 is selected sends to the base station with feedback information by sending module 221.Obviously, the several times that also can select of configuration module 222 send to the base station in the subcarrier spacing of 7.5kHz with feedback information.
As embodiments of the invention, the feedback information that sending module 221 sends comprises:
Link circuit self-adapting feedback information, managed operation information and based on the feedback information of MBMS business tine.
Wherein, the feedback information of link circuit self-adapting comprises: the channel quality information of the required use of Adaptive Modulation and Coding, HARQ (Hybrid Automatic Repeat reQuest, mixed automatic repeat request) retransmit indication information and pre-coding matrix information etc.
Feedback information based on business tine comprises: user's ballot, user's message etc.
The needed feedback information of operation management comprises: authentication information, customer satisfaction survey information and charging statistical information etc.The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (15)
1, a kind of feedback method of multimedia broadcast-multicast service MBMS transmission is characterized in that, may further comprise the steps:
Terminal receives the MBMS business that the base station sends, and described MBMS business sends with the OFDM modulation system, and the subcarrier spacing of described OFDM modulation is T;
The subcarrier spacing that described terminal is selected to be equal to or greater than T sends to described base station with feedback information.
2, the feedback method of MBMS transmission as claimed in claim 1 it is characterized in that the uplink and downlink communication between described terminal and the described base station is a TDD mode, and up-downgoing service subframe ratio is less than 1.
3, the feedback method of MBMS transmission as claimed in claim 2 is characterized in that, the MBMS business that described terminal receives the base station transmission comprises:
Described base station sends the MBMS business to described terminal on special carrier, all the downlink business subframes in the described special carrier are used for the MBMS transmission.
4, the feedback method of MBMS transmission as claimed in claim 2 is characterized in that, described terminal sends feedback information to described base station on special carrier, and all the uplink service subframes in the described special carrier are used for transmitting feedback information.
5, the feedback method of MBMS transmission as claimed in claim 1 is characterized in that, the subcarrier spacing T that described MBMS transmission is used comprises 7.5kHz.
6, the feedback method of MBMS transmission as claimed in claim 1 is characterized in that described terminal is fed back employed subcarrier spacing and comprised 15kHz.
7, the feedback method of MBMS transmission as claimed in claim 1 is characterized in that described feedback information comprises the link circuit self-adapting feedback information.
8, the feedback method of MBMS transmission as claimed in claim 7 is characterized in that, described link circuit self-adapting feedback information comprises channel quality information, re-transmission indication information and the pre-coding matrix information of the MBMS business that described terminal receives.
9, the feedback method of MBMS transmission as claimed in claim 1 is characterized in that described feedback information comprises managed operation information.
10, the feedback method of MBMS transmission as claimed in claim 9 is characterized in that described managed operation information comprises authentication information, customer satisfaction survey information and the charging statistical information of described terminal.
11, the feedback method of MBMS transmission as claimed in claim 1 is characterized in that described feedback information comprises the feedback information based on the MBMS business tine.
12, a kind of reponse system of MBMS transmission is characterized in that, comprising:
The base station, described base station sends the MBMS business to terminal, and described MBMS business sends with the OFDM modulation system, and the subcarrier spacing of described OFDM modulation is T;
Terminal, described terminal receive the MBMS business that described base station sends, and use the subcarrier spacing that is equal to or greater than T that feedback information is sent to described base station in up channel.
13, a kind of terminal equipment is characterized in that, comprising:
Receiver module, described receiver module are used to receive the MBMS business that the base station sends, and described MBMS business sends with the OFDM modulation system, and the subcarrier spacing of described OFDM modulation is T;
Sending module, described sending module are used for sending feedback information to described base station;
Configuration module, described configuration module is used to select to send the subcarrier spacing of feedback information, and the subcarrier spacing of selecting to be equal to or greater than T sends to described base station by described sending module.
14, terminal equipment as claimed in claim 13, it is characterized in that, the subcarrier spacing of the OFDM modulation that described receiver module receives is 7.5kHz, and the subcarrier spacing of the 15kHz that described configuration module is selected sends to described base station with feedback information by described sending module.
15, terminal equipment as claimed in claim 14 is characterized in that, the feedback information that described sending module sends comprises:
Link circuit self-adapting feedback information, managed operation information and based on the feedback information of MBMS business tine.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810223630A CN101686434A (en) | 2008-09-28 | 2008-09-28 | MBMS transmission feedback method, system and devices |
| PCT/CN2009/074080 WO2010034233A1 (en) | 2008-09-28 | 2009-09-21 | Method, system and device for transmitting multimedia broadcast multicast service |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810223630A CN101686434A (en) | 2008-09-28 | 2008-09-28 | MBMS transmission feedback method, system and devices |
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| WO2016004634A1 (en) * | 2014-07-11 | 2016-01-14 | Mediatek Singapore Pte. Ltd. | Method for enb, ue uplink transmission and reception |
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| WO2018059293A1 (en) * | 2016-09-29 | 2018-04-05 | 华为技术有限公司 | Parameter determination method, base station and user equipment |
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- 2008-09-28 CN CN200810223630A patent/CN101686434A/en active Pending
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| WO2016004634A1 (en) * | 2014-07-11 | 2016-01-14 | Mediatek Singapore Pte. Ltd. | Method for enb, ue uplink transmission and reception |
| CN112887069A (en) * | 2015-06-22 | 2021-06-01 | 瑞典爱立信有限公司 | Dynamic selection of multi-carrier modes based on QOS parameters |
| CN112887069B (en) * | 2015-06-22 | 2024-04-12 | 瑞典爱立信有限公司 | Dynamic selection of multi-carrier mode based on QOS parameters |
| CN107810616A (en) * | 2015-06-22 | 2018-03-16 | Lg 电子株式会社 | Send the method and NB IOT equipment of uplink channel |
| US10778383B2 (en) | 2015-06-22 | 2020-09-15 | Lg Electronics Inc. | Apparatus and method for determining a time resource unit |
| CN107810616B (en) * | 2015-06-22 | 2021-01-26 | Lg 电子株式会社 | Method for transmitting uplink channel and NB-IOT device |
| CN107295542A (en) * | 2016-03-31 | 2017-10-24 | 华为技术有限公司 | Transmission method, user equipment and the network equipment of information |
| CN107295542B (en) * | 2016-03-31 | 2023-11-03 | 华为技术有限公司 | Information transmission method, user equipment and network equipment |
| WO2018027705A1 (en) * | 2016-08-10 | 2018-02-15 | 华为技术有限公司 | Signal transmission method, apparatus, and system |
| WO2018027812A1 (en) * | 2016-08-11 | 2018-02-15 | 华为技术有限公司 | A data processing method and device |
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| WO2018059293A1 (en) * | 2016-09-29 | 2018-04-05 | 华为技术有限公司 | Parameter determination method, base station and user equipment |
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