CN101350803B - Method and apparatus for conveying down data - Google Patents
Method and apparatus for conveying down data Download PDFInfo
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- CN101350803B CN101350803B CN2007101191326A CN200710119132A CN101350803B CN 101350803 B CN101350803 B CN 101350803B CN 2007101191326 A CN2007101191326 A CN 2007101191326A CN 200710119132 A CN200710119132 A CN 200710119132A CN 101350803 B CN101350803 B CN 101350803B
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Abstract
The invention discloses a downgoing data transmission method and belongs to the field of the ultra-third-generation mobile communication. The method is used to promote the spectrum effect and the resource utilization rate of the B3G MBMS system. The method comprises that a network side monitoring is used to carry the time protection interval which is required by the mutual transformation of the upgoing and the downgoing link in the data frame of the specific downgoing carrier broadcast multicasting service, and the downgoing data is transmitted to the user based on the time protection interval monitored. Correspondingly, the invention also discloses a transmission device of the downgoing data.
Description
Technical field
The present invention relates to the data transmission technology in the ultra 3G (Third Generation) Moblie field, relate in particular to the transfer approach and the device of downlink data.
Background technology
(B3G, Beyond3G) in the GSM, the multimedia broadcast-multicast service of introducing (MBMS, Multimedia Broadcast Multicast Service) has brought new channel model at the ultra third generation.As shown in Figure 1; Be B3G MBMS channel model sketch map; It is the MBMS service that three logic channels are wherein arranged: the MBMS point is to multiple spot control channel (MCCH; MBMS point-to-multipoint ControlChannel), MBMS point-to-multipoint service channel (MTCH; MBMS point-to-multipoint TrafficChannel) and the MBMS point to multiple spot scheduling channel (MSCH, MBMS point-to-multipointSchedule Channel), these three logic channels are respectively applied for and carry the professional transmitting scheduling information of MBMS business control information, MBMS business datum and MBMS.These logic channels all can be mapped to the forward access channel (FACH of transmission channel; Forward Access Channel); And the Secondary Common Control Physical Channel (SCCPCH, Secondary Common Control PhysicalChannel) that finally is mapped in physical channel is gone up the selected traffic transmission of realization.Except above-mentioned three the logic channel, also having a physical channel in addition is the MBMS service: the MBMS point is to multiple spot notification instruction channel (MICH, MBMSpoint-to-multipoint Indicator Channel).In the MBMS business, and user terminal (UE, thus UserEquipment) trigger the information that reads MCCH through monitoring to MICH.
In B3G mobile communication MBMS system, general service and downlink dedicated carrier wave MBMS business all are mapped on the SCCPCH to be transmitted.General service is mapped to the data frame format that transmits on the SCCPCH, and general that adopt is time division duplex (TDD; Time Division Duplex) frame structure; As shown in Figure 2; Be tdd frame structural representation in the general service, wherein getting per 10 milliseconds (ms) is a frame, and every frame is divided into the subframe of two 5ms again.In each subframe; Comprise descending time slot TS0 to TSn; Ascending time slot TSn+1 to TSm; Synchronization slot, down link are transformed into the guardtime interval (DUSP, Downlink Uplink Switch Point) of up link and the guardtime interval (UDSP, Uplink Downlink Switch Point) that up link is transformed into down link.
And downlink dedicated carrier wave MBMS business is mapped to when transmitting on the SCCPCH; Then there is not ascending time slot in the tdd frame that adopts; All time slots are all as descending time slot; Therefore guardtime interval D USP and the UDSP between the uplink and downlink timeslot in the tdd frame structure just becomes idling-resource, causes the waste of resource, reduced the spectrum effect of whole system.
Summary of the invention
The present invention provides a kind of transfer approach of downlink data, to improve the spectrum effect of B3G MBMS system.
The invention provides a kind of transfer approach of downlink data, comprise step: the network side monitoring is used for the uplink downlink of the Frame of bearing downlink special carrier broadcasting multicast service and changes required guardtime mutually at interval; Based on the length at said guardtime interval, the quantity of subcarrier, confirm the data type and the corresponding quantity of all types of data of sending; Quantity based on said established data type and all types of data are corresponding is obtained data to be sent, utilizes from down link to be transformed into the required guardtime interval D USP of up link and to confirm that based on the quantity of the OFDM symbol that comprises in the quantity of subcarrier and the DUSP bearing mode of data to be sent transmits downlink data to the user.
The present invention also provides a kind of conveyer of downlink data, comprises monitoring unit, is used for monitoring the required guardtime interval of the mutual conversion of uplink downlink in order to the Frame of bearing downlink special carrier broadcasting multicast service; And delivery unit, be used for based on the length at said guardtime interval, the quantity of subcarrier, confirm the data type and the corresponding quantity of all types of data of sending; Quantity based on said established data type and all types of data are corresponding is obtained data to be sent, utilizes from down link to be transformed into the required guardtime interval D USP of up link and to confirm that based on the quantity of the OFDM symbol that comprises in the quantity of subcarrier and the DUSP bearing mode of data to be sent transmits downlink data to the user.
The embodiment of the invention is in B3G downlink dedicated carrier wave MBMS business; With uplink downlink mutually the required guardtime of conversion change descending time slot at interval into and be used for the downlink datas such as business datum that communications of control data and content supplier provide; Avoided above-mentioned guardtime not being used to transmit the problem that data cause the wasting of resources at interval, improved the spectrum effect and the resource utilization of whole system.
Description of drawings
Fig. 1 is a B3G MBMS channel model sketch map;
Fig. 2 is a TDD system frame structure sketch map in the general service;
Fig. 3 is the professional tdd frame structural representation that adopts of B3G downlink dedicated carrier wave MBMS in the embodiment of the invention;
Fig. 4 transmits the implementation procedure flow chart of downlink data for utilize DUSP based on the inventive method;
Fig. 5 is the bearing mode sketch map of data to be sent in the embodiment of the invention;
Fig. 6 transmits the embodiment implementing procedure figure of downlink data for utilize DUSP based on the inventive method;
Fig. 7 is the structural representation of the downlink data conveyer of embodiment of the invention proposition;
Fig. 8 is the structural representation of the delivery unit of embodiment of the invention proposition.
Embodiment
Analysis by above-mentioned prior art is visible, owing in B3G downlink dedicated carrier wave MBMS business, do not utilize DUSP and UDSP to transmit data, has wasted valuable time resource and frequency spectrum resource in the system, has correspondingly reduced the spectrum effect of system.As shown in Figure 3; Be the professional tdd frame structural representation that adopts of B3G downlink dedicated carrier wave MBMS in the embodiment of the invention; The technical scheme that the embodiment of the invention here proposes be consider with uplink downlink mutually the required guardtime of conversion change descending time slot at interval into and be used for business datum that communications of control data and/or content supplier provide etc.; Avoid the waste of resource, thereby improve the spectrum effect of system, and then improve the utilance of resource.
To combine each accompanying drawing to carry out detailed elaboration below to the realization principle of technical scheme of the present invention, embodiment and to the beneficial effect that should be able to reach.
Design philosophy of the present invention is in B3G downlink dedicated carrier wave MBMS business, the required guardtime appearance at interval of conversion mutually of monitoring uplink downlink; And send downlink data to respective user at interval based on the guardtime that monitors.
Wherein B3G downlink dedicated carrier wave MBMS business can but be not limited to carry out through B3G downlink dedicated carrier wave MBMS system; If for example there are 5 carrier waves in the B3G MBMS system; Wherein 1 as the downlink dedicated carrier wave; Other 4 as the general service carrier wave, it is professional that said system also can be carried out B3G downlink dedicated carrier wave MBMS so.
If with OFDM symbol (OFDM Symbol; Orthogonal Frequency Division Multiplex Symbol) weighs the length of DUSP; Then can regard the OFDM symbol as a chronomere; Though so since the number of the OFDM symbol that the number of the OFDM symbol that comprises of DUSP comprises than time slot lack; But difference is little, so DUSP can be used to transmit business datum that MBMS traffic overhead and content supplier provide etc., for example is used for transmitting the control data of channels such as MICH, MCCH, MSCH and BCH, the business datum that content supplier provides etc.At present because the length of UDSP does not generally reach the length of an OFDM symbol; Therefore in the embodiment of the invention mainly to utilize DUSP to transmit downlink data; But do not get rid of the situation of when the length of UDSP is equal to, or greater than an OFDM symbol, utilizing UDSP to transmit downlink data, its execution mode is similar with the implementation process of utilizing DUSP transmission downlink data.
The embodiment of the invention is that example describes to utilize DUSP to transmit downlink data here, and concrete treatment step is following:
1, based on the length of DUSP, the quantity of subcarrier, data type and the corresponding quantity of all types of data that regulation utilizes DUSP to send;
Required control data, business datum that content supplier provides etc. when type of data mainly comprises the network side service data transmission.Owing to confirm for the length of a certain system DUSP and the quantity of subcarrier, the data volume of therefore utilizing DUSP to transmit is also confirmed, not necessarily equates for this data volume of different systems certainly.Network side is utilizing before the DUSP Data transmission; The data volume that can transmit based on DUSP is earlier confirmed the data type and the corresponding quantity of all types of data of transmission; Its definite rule can but to be not limited to be to judge at first whether the data volume of utilizing DUSP to transmit can transmit control data; If continue to consider transmit business datum that content supplier provides etc. so; If not, network side translator unit control data so.Above-mentioned control data can be included in MICH, MCCH, MSCH, broadcast channel (BCH; Broadcast Channel) etc. the data that transmit in the channel; The data that wherein transmit among the MICH are used for the professional arrival to the corresponding MBMS of subscriber equipment (UE, User Equipment) indication; The data that transmit among the MCCH are business control informations; The data that transmit among the MSCH are MBMS time sequence informations, are used for the beginning and the end of dispatching services, if some system informations in the data owner downlink dedicated carrier wave MBMS sub-district of transmitting among the BCH.
2, based on the data type and the corresponding quantity of all types of data of afore mentioned rules, utilize DUSP to send corresponding data.
As shown in Figure 4, transmit the implementation procedure flow chart of downlink data for utilize DUSP based on the inventive method, its implementation procedure is following:
Corresponding data to be sent are obtained and stored to step 10 according to predetermined data type, and the corresponding quantity of all types of data;
If data to be sent comprise control data, the data that for example in MICH, MCCH, MSCH or BCH, transmit, network side was based on the business that will send in the later time slot of DUSP earlier before current DUSP arrives so, asked for and store corresponding control data; And if data to be sent comprise the business datum that content supplier provides, so network side before current DUSP arrives, according to the rules the business datum that data volume receives and memory contents provider provides in advance earlier.
The bearing mode of data to be sent is meant in the present embodiment: the method for salary distribution that data allocations to be sent is carried on different subcarriers and the different OFDM symbol; Network side is through distribution data to be sent in each OFDM symbol, and the Data-carrying to be sent that will distribute sends to UE on the subcarrier of some.Suppose to have the m number of sub-carrier, comprise n OFDM symbolic number in the DUSP, wherein m and n are natural numbers; So with reference to Fig. 5; Be the bearing mode sketch map of data to be sent in the embodiment of the invention, abscissa is the time among the figure, and DUSP is divided into n OFDM symbol; The longitudinal axis is a frequency, has m frequency different subcarriers to be used to carry data.Illustrated this bearing mode is:
In i-1 OFDM symbol of the 1st OFDM symbol to the, subcarrier 1 is used for carrying the control data of MCCH to subcarrier j, and subcarrier j+1 is used for carrying the control data of MICH to subcarrier m;
In i+k OFDM symbol of i OFDM symbol to the, subcarrier 1 is used for carrying the control data of BCH to subcarrier j, and subcarrier j+1 is used for carrying the control data of MSCH to subcarrier m;
In n OFDM symbol of i+k+1 OFDM symbol to the, the data that subcarrier 1 is used to carry EPG to subcarrier j, subcarrier j+1 is used to carry the low speed text data to subcarrier m;
Certainly, this only is a kind of bearing mode, in fact has a variety of bearing modes, and the method for salary distribution that data to be sent specifically is assigned to OFDM symbol and subcarrier is not unique definite.For example above-mentioned bearing mode is to i-1 OFDM symbol, to carry the control data that transmits among MCCH and the MICH at the 1st; In i+k OFDM symbol of i OFDM symbol to the, carry the control data that transmits among BCH and the MSCH; In fact also can in preceding k OFDM symbol, carry the control data that transmits among BCH and the MSCH, in k+i OFDM symbol of k+1 OFDM symbol to the, carry the control data that transmits among MCCH and the MICH.
Suppose the control data of data that regulation utilizes DUSP to transmit in MICH, MCCH, MSCH and BCH, transmitting; Electronic program guides (the EPG that content supplier provides; Electric ProgramGuide) and the low speed text data (like message such as weather forecast, news information) that provides of content supplier; Then as shown in Figure 6, transmit the embodiment implementing procedure figure of downlink data for utilize DUSP based on the inventive method, its concrete implementation process is following:
Wherein in the subsequent timeslot of current DUSP, the business that will send both can be the business that in current subframe, will send, also might be the business that will send in the subsequent subframe of current subframe.
Because in the quantity of data inner control data to be sent generally is constant, if therefore the data volume of the EPG that provides of content supplier and low speed text is constant, then step 102 and not requiring in each subframe is all carried out.
Wherein owing in each subframe, all need communications of control data; So if current OFDM symbol is last DUSP in the current DUSP; To forward step 100 to so; Obtain the downlink data that the DUSP in next subframe will transmit,, will continue to extract the data to be sent of storing so and send to respective user if current OFDM is not last DUSP in the current DUSP.
Wherein the foregoing description each data of extracting in the data to be sent are should data carried by data in the current OFDM symbol; Can certainly data to be sent all be extracted; Deposit buffer memory in, extract corresponding OFDM symbol more successively and should data carried by data send UE to.
The foregoing description is utilizing DUSP transmission to comprise that the data to be sent of various control datas explain design concept of the present invention, and the business datum that the content supplier that comprises in the data wherein to be sent provides only is EPG with some low speed text datas etc. seldom.In fact can regard DUSP as generic downlink time slot that length is slightly little; Network side utilizes DUSP to transmit the data to be sent that mainly comprise the business datum that content supplier provides; Compare with the foregoing description so, its implementation procedure only is that network side mainly receives external data as data to be sent.
This shows; The downlink datas such as business datum of the embodiment of the invention through utilizing DUSP communications of control data and/or content supplier to provide; Guardtime when having avoided in B3G downlink dedicated carrier wave MBMS business, not utilizing uplink downlink to change mutually transmits the problem that data cause the wasting of resources at interval, has improved the spectrum effect and the resource utilization of whole system.And, make corresponding UE select corresponding multimedia service according to EPG through transmitting the EPG that content supplier provides, improved the reception of UE and experienced.
Based on the downlink data transfer approach that the foregoing description proposes, the embodiment of the invention also provides a kind of downlink data conveyer.
Be illustrated in figure 7 as the structural representation of the downlink data conveyer of embodiment of the invention proposition, this downlink data conveyer 10 comprises:
Downlink data first acquiring unit 13 is used for asking in advance and storing the professional required control data of transmission MBMS;
Downlink data second acquisition unit 14 is used for receiving in advance and the business datum that provides of memory contents provider.
Wherein downlink data first acquiring unit 13 and downlink data second acquisition unit 14 can only be provided with one of which in the practical implementation process, perhaps all give and setting for two.In addition, based on the source of the downlink data that transmits and the difference of obtain manner, downlink data conveyer 10 can also comprise that other obtains the acquiring unit of downlink data; Perhaps do not comprise any downlink data acquiring unit.The downlink data that for example transmits if desired is the data of having stored, and delivery unit 12 can directly transmit the data of having stored so.
As shown in Figure 8.The structural representation of the delivery unit that proposes for the embodiment of the invention, this delivery unit 12 specifically comprises:
Bearing mode is confirmed subelement 15, is used for confirming in advance the bearing mode of downlink data; This bearing mode confirms that subelement 15 confirms that a kind of preferred methods of bearing modes is: based on the OFDM symbol quantity that the quantity of the downlink data amount that will transmit, bearing downlink data subcarrier and the guardtime that monitors comprise at interval, confirm the bearing mode of downlink data.
Transmit subelement 16, be used for,, downlink data is carried on sends the user on the different sub carrier to according to predetermined downlink data bearing mode based on monitoring guardtime at interval.Wherein this transmission subelement 16 with a kind of preferred embodiments that downlink data is carried to subcarrier is: based on the OFDM modulation system downlink data is carried on the subcarrier.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (5)
1. the transfer approach of a downlink data is characterized in that, comprises step:
The network side monitoring is used for the uplink downlink of the Frame of bearing downlink special carrier broadcasting multicast service and changes required guardtime mutually at interval;
Based on the length at said guardtime interval, the quantity of subcarrier, confirm the data type and the corresponding quantity of all types of data of sending;
Quantity based on said established data type and all types of data are corresponding is obtained data to be sent, utilizes from down link to be transformed into the required guardtime interval D USP of up link and to transmit downlink data based on the bearing mode of the definite data to be sent of the quantity of the OFDM symbol that comprises in the quantity of subcarrier and the DUSP to the user.
2. the method for claim 1 is characterized in that, said downlink data is: the required control data of transmission broadcasting multicast service that network side is asked in advance and stored.
3. the method for claim 1 is characterized in that, said downlink data is: the business datum that the content supplier that network side receives in advance and stores provides.
4. the method for claim 1; It is characterized in that; Based on the OFDM symbol quantity that the quantity of the downlink data amount that will transmit, bearing downlink data subcarrier and the guardtime that monitors comprise at interval, confirm the bearing mode of downlink data;
Network side is carried on downlink data on the subcarrier through the OFDM modulation system.
5. a downlink data conveyer is characterized in that, comprises
Monitoring unit is used for monitoring the required guardtime interval of the mutual conversion of uplink downlink in order to the Frame of bearing downlink special carrier broadcasting multicast service;
Delivery unit is used for based on the length at said guardtime interval, the quantity of subcarrier, confirms the data type and the corresponding quantity of all types of data of sending; Quantity based on said established data type and all types of data are corresponding is obtained data to be sent, utilizes from down link to be transformed into the required guardtime interval D USP of up link and to transmit downlink data based on the bearing mode of the definite data to be sent of the quantity of the OFDM symbol that comprises in the quantity of subcarrier and the DUSP to the user.
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| CN2007101191326A CN101350803B (en) | 2007-07-16 | 2007-07-16 | Method and apparatus for conveying down data |
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| CN2007101191326A CN101350803B (en) | 2007-07-16 | 2007-07-16 | Method and apparatus for conveying down data |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101959136B (en) * | 2009-07-20 | 2015-06-03 | 中兴通讯股份有限公司 | Sending, transmitting and receiving method of MCCH (Multi-point Control Channel) information and transmission system |
| CN102857460B (en) * | 2011-06-30 | 2015-11-25 | 上海贝尔股份有限公司 | Carry out the method and apparatus of transfer of data in a wireless communication system |
| CN102742203B (en) * | 2012-03-20 | 2014-10-08 | 华为技术有限公司 | Method, device and system for transmitting data in coaxial network |
| CN104469689B (en) * | 2013-09-23 | 2018-09-25 | 中国科学院上海高等研究院 | The indication signaling and signaling indication method of superframe structure in multi-carrier frequency multimedia broadcasting |
| CN105553605B (en) * | 2014-11-04 | 2019-04-05 | 中国电信股份有限公司 | Communication means, system and base station and terminal |
| CN106792776B (en) * | 2015-11-24 | 2020-04-03 | 华为技术有限公司 | Beam processing method and base station |
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