CN101599937B - Method and device for transmitting physical multicasting channel in special time slot - Google Patents
Method and device for transmitting physical multicasting channel in special time slot Download PDFInfo
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- CN101599937B CN101599937B CN 200810114272 CN200810114272A CN101599937B CN 101599937 B CN101599937 B CN 101599937B CN 200810114272 CN200810114272 CN 200810114272 CN 200810114272 A CN200810114272 A CN 200810114272A CN 101599937 B CN101599937 B CN 101599937B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000013507 mapping Methods 0.000 claims abstract description 70
- 101001018494 Homo sapiens Pro-MCH Proteins 0.000 claims description 41
- 102100033721 Pro-MCH Human genes 0.000 claims description 41
- 238000012217 deletion Methods 0.000 claims description 34
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- 238000012545 processing Methods 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 abstract description 10
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- 238000010586 diagram Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The embodiment of the invention discloses a method and a device for transmitting a physical multicasting channel (PMCH) in a downlink pilot time slot (DwPTS), wherein the method comprises the following steps: judging OFDM symbolic numbers occupied by the DwPTS, modifying a preset mapping structure according to the OFDM symbolic numbers, and transmitting the PMCH on the DwPTS according to the modified mapping structure. The embodiment of invention provides a mapping method of MBSFN reference symbols when the PMCH is transmitted on the DwPTS through referring the specification of an LTE system to the PMCH transmission according to the characteristics of the DwPTS, provides the functional supplementation, improves the flexibility of the system and is simple and easy to implement.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to the method and apparatus of transmitting physical multicasting channel (PMCH, Physical multicast Channel) in special time slot (DwPTS, DownlinkPilot Time Slot).
Background technology
Third generation partner program (3GPP, 3rd Generation Partnership Project) Long Term Evolution (LTE, Long Term Evolution) system supports Frequency Division Duplexing (FDD) (FDD, Frequency DivisionDuplex) pattern and time division duplex (TDD, Time Division Duplex) pattern, two kinds of dual-modes use different frame structures.
Wherein each radio frames of LTE TDD system is made of the long field (half-frame) of two 5ms; be the system of 5ms for the uplink and downlink change-over period; each field comprises subframe (subframe) and 3 special time slots (special slot) that 4 1ms are long: comprise special time slot (DwPTS), protection interval (GP) and the uplink special time slot (UpPTS) of descending pilot frequency, the overall length of these 3 special time slots is 1ms.For the uplink and downlink change-over period be the system of 10ms, first field comprises subframe that 4 1ms are long and 3 special time slot: DwPTS, GP and UpPTS; Second field is comprised of the long subframe of 5 1ms.
Referring to Fig. 1, be the structure chart of above-mentioned radio frames, for the uplink and downlink change-over period be the system of 5ms, DwPTS is positioned at subframe 1 and subframe 6 (in the situation of 10ms switching cycle, only being present in subframe 6).Subframe 0 and subframe 5 and DwPTS are fixed as downlink transfer and reserve.
Referring to Fig. 2, structural representation for DwPTS, transmitting downlink control signal in front 1～2 OFDM (OFDM) symbol in the DwPTS time slot, wherein, 72 central subcarriers in the 3rd OFDM symbol always are used for transmission user and carry out the master sync signal that the residential quarter goes out to search (sell search).Except Physical Broadcast Channel (PBCH, Physical Broadcast Channel) outside, the idling-resource that any downlink business can take on the DwPTS transmits, such as physical down link sharing channel (PDSCH, Physical Downlink Shared Channel), PMCH etc.
Table 1 has provided the various configuring conditions of DwPTS, and 1 OFDM symbol lengths is 2192Ts in regular circulation prefix (CP) subframe, comprises altogether 14 OFDM symbols in the whole subframe; The length of an OFDM symbol is 2560Ts in the expansion CP subframe, comprises altogether 12 OFDM symbols in the whole subframe.
Table 1:
Can find out that for conventional CP subframe, DwPTS may take 3,9,10,11,12 OFDM symbols; In the expansion CP subframe, DwPTS may take 3,8,9,10 OFDM symbols.
For any subframe, if DwPTS only takies 3 OFDM symbols, then can not in this time slot, transmit other downlink business; When DwPTS takies more than three OFDM symbols, then can utilize idling-resource to transmit other downlink business.
There is the multiple configuring condition that is different from the general service subframe in the DwPTS time slot, and has only defined at present the method for transmitting PMCH in the general service subframe in the LTE standard, the also not explanation of transmitting PMCH in DwPTS to how.
Summary of the invention
In view of this, the purpose of the embodiment of the invention is to be provided at method, device and the base station equipment of transmitting PMCH among the DwPTS, according to the characteristics of DwPTS time slot, simultaneously with reference to the regulation of LTE system to the PMCH transmission, when having provided on the DwPTS time slot transmitting PMCH, the mapping method of MBSFN reference symbol, provide function to replenish to prior art, the flexibility that has improved system, and, the method is simple, and is easy to implement.
For achieving the above object, the embodiment of the invention provides following technical scheme:
A kind of in comprising the special time slot DwPTS of descending pilot frequency the method for transmitting physical multicasting channel PMCH, comprising:
Judge the OFDM symbolic number that DwPTS takies;
According to described OFDM symbolic number, the OFDM symbol in the default mapping structure of deletion;
According to the mapping structure of revising, and when DwPTS takies more than 3 OFDM symbols, transmitting PMCH on the DwPTS time slot.
Preferably, when the OFDM symbolic number that takies as described DwPTS is 8, according to the OFDM symbolic number, revises default mapping structure and specifically comprise:
The the 9th to the 12nd OFDM symbol in the default mapping structure of deletion.
Preferably, when the OFDM symbolic number that takies as described DwPTS is 9, according to the OFDM symbolic number, revises default mapping structure and specifically comprise:
The the 10th to the 12nd OFDM symbol in the default mapping structure of deletion.
Preferably, when the OFDM symbolic number that takies as described DwPTS is 10, according to the OFDM symbolic number, revises default mapping structure and specifically comprise:
The the 11st and 12 OFDM symbol in the default mapping structure of deletion.
A kind of in comprising the special time slot DwPTS of descending pilot frequency the device of transmitting physical multicasting channel PMCH, comprising:
Judging unit is used for the OFDM symbol numbers of judging that DwPTS comprises;
The first processing unit is used for according to the OFDM symbol numbers, the OFDM symbol in the default mapping structure of deletion;
The second processing unit is used for according to amended mapping structure, and when DwPTS takies more than 3 OFDM symbols, transmitting PMCH on the DwPTS time slot.
Preferably, in the said apparatus, described the first processing unit comprises:
First information acquiring unit is for the judged result of obtaining judging unit;
First revises the unit, when being 8 for the OFDM symbol that comprises as this judged result indication DwPTS, and the 9th to the 12nd OFDM symbol in the default mapping structure of deletion.
Preferably, in the said apparatus, described the first processing unit comprises:
The second information acquisition unit is for the judged result of obtaining described judging unit;
Second revises the unit, when being 9 for the OFDM symbol that comprises as this judged result indication DwPTS, and the 10th to the 12nd OFDM symbol in the default mapping structure of deletion.
Preferably, in the said apparatus, described the first processing unit comprises:
The 3rd information acquisition unit is for the judged result of obtaining described judging unit.
The 3rd revises the unit, when being 10 for the OFDM symbol that comprises as this judged result indication DwPTS, and the 11st to the 12nd OFDM symbol in the default mapping structure of deletion.
A kind of base station equipment possesses the described device of above-mentioned any one.
Can find out from top description, the embodiment of the invention is according to the characteristics of DwPTS time slot, simultaneously with reference to the regulation of LTE system to the PMCH transmission, when having provided on the DwPTS time slot transmitting PMCH, the mapping method of MBSFN reference symbol provides function to replenish to prior art, improved the flexibility of system, and the method is simple and practical, and is easy to implement.
Description of drawings
Fig. 1 is existing frame structure schematic diagram;
Fig. 2 is the DwPTS schematic diagram;
Fig. 3 is default mapping structure example;
Fig. 4 is the flow chart of embodiment of the method one provided by the present invention;
Fig. 5 is the flow chart of embodiment of the method two provided by the present invention;
The corresponding mapping structure schematic diagram of a DwPTS who takies 8 OFDM symbols that Fig. 6 provides for the embodiment of the invention;
The corresponding mapping structure schematic diagram of a DwPTS who takies 9 OFDM symbols that Fig. 7 provides for the embodiment of the invention;
The corresponding mapping structure schematic diagram of a DwPTS who takies 10 OFDM symbols that Fig. 8 provides for the embodiment of the invention;
Fig. 9 is the structural representation of device embodiment one provided by the present invention;
Figure 10 is the structural representation of device embodiment two provided by the present invention;
Figure 11 is the structural representation of device embodiment three provided by the present invention;
Figure 12 is the structural representation of device embodiment four provided by the present invention.
Embodiment
The embodiment of the invention provides the method and apparatus of transmitting PMCH in DwPTS, characteristics according to the DwPTS time slot, simultaneously with reference to the regulation of LTE system to the PMCH transmission, when having provided on the DwPTS time slot transmitting PMCH, the mapping method of MBSFN reference symbol provides function to replenish to prior art, improved the flexibility of system, and the method is simple, and is easy to implement.
Transmission has following regulation to PMCH in the LTE system:
PMCH only uses expansion CP (extended CP), and takes whole frequency band;
Do not support transmit diversity;
Carry out layer (layer) mapping and precoding (percoding) based on the single antenna port, and use antenna port 4 to transmit;
Carry out in the subframe of PMCH transmission, keep front 1 or 2 OFDM symbol and carry out clean culture (non-MBSFN) transmission, be used for control channel;
PMCH cannot take subframe 0 and subframe 5 is transmitted.
Utilize the DwPTS transmitting PMCH need to satisfy afore mentioned rules, and, because DwPTS carries out the employed master sync signal of Cell searching (cell search) (namely at DwPTS for all users in the transmission residential quarter, master sync signal priority is the highest), for guaranteeing the whole system normal operation, when any signal and master sync signal clashed, master sync signal must be retained.In addition, because there is multiple different configuring condition in DwPTS, and always be different from generic downlink subframe (on the time domain, shorter than generic downlink subframe), so can not directly use existing MBSFN reference symbol mapping pattern to carry out resource mapping.
If redefine the reference symbol mapping pattern for every kind of configuration respectively, then need additionally to increase by 3 kinds of new structures, thereby increase the complexity of system.Therefore use a kind of comparatively general default mapping structure (general mapping structure method for designing is 200810106164.7 patent document referring to the patent No.), simply intercept or destroy and then the method that obtains available mapping pattern is comparatively desirable according to different configurations.
Fig. 3 was for presetting the mapping structure example, and this mapping structure comprises 12 row, and corresponding 12 OFDM symbols wherein comprise the residential quarter dedicated reference symbols in front 1～2 OFDM symbol, comprise the MBSFN reference symbol in the 4th, the 8th, the 12nd the OFDM symbol.
As shown in the figure, the latticed expression residential quarter dedicated reference symbols of the 1st row among the figure, the R in the 4th row, the 8th row and the 12nd row
4Expression MBSFN reference symbol, blank parts represents data symbol.
The characteristics of described default mapping structure comprise:
1, according to the difference configuration of DwPTS, part OFDM symbol can be struck off in this default mapping structure;
2,72 subcarriers in center are kept for master sync signal on the 3rd OFDM symbol of DwPTS time slot.
Wherein:
Reference symbol and master sync signal in the default mapping structure do not clash.
From the OFDM symbol position that the afterbody of described default mapping structure is struck off, i.e. GP, the relevant position in the subframe that UpPTS takies.
In the OFDM symbol of destroying, except the data outer symbol also may comprise the MBSFN reference symbol.
Understand technical scheme of the present invention for those skilled in the art can be known, below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
Referring to accompanying drawing 4, for provided by the invention in DwPTS the flow chart of the embodiment one of the method for transmitting PMCH.
Specifically may further comprise the steps:
Step 401: judge the OFDM symbolic number that DwPTS takies.
Step 402: according to the OFDM symbolic number that judgement draws, revise default mapping structure.
Step 403: according to amended mapping structure, transmitting PMCH on the DwPTS time slot.
According to the LTE system to the requirement of PMCH transmission and the configuration of DwPTS self, DwPTS can only be at expansion CP subframe transmitting PMCH, only have simultaneously when DwPTS takies more than 3 OFDM symbols, the ability transmitting PMCH, so, in fact, DwPTS that can transmitting PMCH only comprises 8 OFDM symbols, 9 OFDM symbols and three kinds of situations of 10 OFDM symbols.
Step 401 is exactly to judge to comprise several OFDM symbols among the DwPTS, and the amending method of three kinds of default mapping structures of the modification of different symbolic numbers in step 402 is different, is further detailed below in conjunction with diverse ways.
See also Fig. 5, for provided by the invention in DwPTS the flow chart of the embodiment two of the method for transmitting PMCH.
Three kinds of amending methods that different symbolic numbers is corresponding different, present embodiment specifically may further comprise the steps:
Step 501: judge the OFDM symbolic number that DwPTS takies; If described symbolic number is 8, enter step 502; If described symbolic number is 9, enter 503; If described symbolic number is 10, enter 504;
Step 502: the 9th to the 12nd OFDM symbol in the default mapping structure of deletion enters step 505; Mapping structure after the deletion as shown in Figure 6.
Step 503: the 10th to the 12nd OFDM symbol in the default mapping structure of deletion enters step 505; Mapping structure after the deletion as shown in Figure 7.
Step 504: the 11st and the 12nd OFDM symbol in the default mapping structure of deletion enters step 505; Mapping structure after the deletion as shown in Figure 8.
Step 505: according to amended mapping structure, transmitting PMCH on the DwPTS time slot.
Can find out, during modification, be the OFDM symbol from the afterbody Delete superfluous of default mapping structure, i.e. relevant position in the subframe that takies of GP and UpPTS.
The part of deletion has also comprised the MBSFN symbol except data symbol.
By present embodiment, can transmitting PMCH on the DwPTS time slots of various different configurations, this method is simple, easy row, can larger raising system flexibility.
Embodiment is corresponding with said method, and the embodiment of the invention also is provided at the device of transmitting PMCH on the DwPTS time slot, referring to Fig. 9, is the structural representation of this device embodiment one.
This device comprises: judging unit 901, the first processing unit 902 and the second processing unit 903.
Wherein:
Judging unit 901 is used for the OFDM symbol numbers of judging that DwPTS comprises.
The first processing unit 902 is used for obtaining the judged result of judging unit 901, and according to the OFDM symbol numbers that comprises among the DwPTS default mapping structure is made amendment.
The second processing unit 903 is used for according to amended mapping structure transmitting PMCH on the DwPTS time slot.
The workflow of the described device of Fig. 9 is as follows:
Judging unit 901 is judged the OFDM symbol numbers that comprises among the DwPTS, the first processing unit 902 is according to the default mapping structure of the results modification of judging unit 901, and the second processing unit 903 sends PMCH according to the mapping structure after first revises unit 902 modifications at the DwPTS time slot.
Figure 10 shows the structural representation of the embodiment two of the present invention's device of transmitting PMCH on the DwPTS time slot.
The first processing unit 902 comprises: first information acquiring unit 9021 and first is revised unit 9022.
First information acquiring unit 9021 is for the judged result of obtaining judging unit 901.
Mapping structure after the deletion as shown in Figure 6.
Figure 11 shows the structural representation of the embodiment three of the present invention's device of transmitting PMCH on the DwPTS time slot.
The first processing unit 902 comprises: the second information acquisition unit 9023 and second is revised unit 9024.
The second information acquisition unit 9023 is used for obtaining the judged result of judging unit 901.
Mapping structure after the deletion as shown in Figure 7.
Figure 12 shows the structural representation of the embodiment four of the present invention's device of transmitting PMCH on the DwPTS time slot.
The first processing unit 902 comprises: the 3rd information acquisition unit 9025 and the 3rd is revised unit 9029.
The 3rd information acquisition unit 9025 is used for obtaining the judged result of judging unit 901.
The 3rd revises unit 9029, when being 10 for the OFDM symbol that comprises as this judged result indication DwPTS, and the 11st to the 12nd OFDM symbol in the default mapping structure of deletion.
Mapping structure after the deletion as shown in Figure 8.
If with the information process unit in above-described embodiment with revise the unit as one group, then in other embodiments, the first processing unit 902 can comprise the combination in any in above-mentioned group.
In addition, the embodiment of the invention also provides a kind of base station equipment.
This base station comprise above-mentioned on the DwPTS time slot any one device among the device embodiment of transmitting PMCH.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. the method for a transmitting physical multicasting channel PMCH in comprising the special time slot DwPTS of descending pilot frequency is characterized in that, comprising:
Judge the orthogonal frequency division multiplex OFDM symbolic number that DwPTS takies;
According to described OFDM symbolic number, the OFDM symbol in the default mapping structure of deletion;
According to the mapping structure of deletion, and when DwPTS takies more than 3 OFDM symbols, transmitting PMCH on the DwPTS time slot.
2. method according to claim 1 is characterized in that, when the OFDM symbolic number that takies as described DwPTS was 8, according to the OFDM symbolic number, the default mapping structure of deletion specifically comprised:
The the 9th to the 12nd OFDM symbol in the default mapping structure of deletion.
3. method according to claim 1 is characterized in that, when the OFDM symbolic number that takies as described DwPTS was 9, according to the OFDM symbolic number, the default mapping structure of deletion specifically comprised:
The the 10th to the 12nd OFDM symbol in the default mapping structure of deletion.
4. method according to claim 1 is characterized in that, when the OFDM symbolic number that takies as described DwPTS was 10, according to the OFDM symbolic number, the default mapping structure of deletion specifically comprised:
The the 11st and 12 OFDM symbol in the default mapping structure of deletion.
5. the device of a transmitting physical multicasting channel PMCH in comprising the special time slot DwPTS of descending pilot frequency is characterized in that, comprising:
Judging unit is used for the OFDM symbol numbers of judging that DwPTS comprises;
The first processing unit is used for according to the OFDM symbol numbers, the OFDM symbol in the default mapping structure of deletion;
The second processing unit is used for according to the mapping structure after the deletion, and when DwPTS takies more than 3 OFDM symbols, transmitting PMCH on the DwPTS time slot.
6. device according to claim 5 is characterized in that, described the first processing unit comprises:
First information acquiring unit is for the judged result of obtaining judging unit;
First revises the unit, when being 8 for the OFDM symbol that comprises as this judged result indication DwPTS, and the 9th to the 12nd OFDM symbol in the default mapping structure of deletion.
7. device according to claim 5 is characterized in that, described the first processing unit comprises:
The second information acquisition unit is for the judged result of obtaining described judging unit;
Second revises the unit, when being 9 for the OFDM symbol that comprises as this judged result indication DwPTS, and the 10th to the 12nd OFDM symbol in the default mapping structure of deletion.
8. device according to claim 5 is characterized in that, described the first processing unit comprises:
The 3rd information acquisition unit is for the judged result of obtaining described judging unit;
The 3rd revises the unit, when being 10 for the OFDM symbol that comprises as this judged result indication DwPTS, and the 11st to the 12nd OFDM symbol in the default mapping structure of deletion.
9. a base station equipment is characterized in that, possesses such as the described device of claim 5-8 any one.
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| CN101789812B (en) * | 2010-01-15 | 2013-02-27 | 重庆邮电大学 | LTE MIMO communication transmission channel modeling method based on dual polarized antenna |
| CN103391265B (en) * | 2012-05-11 | 2018-01-19 | 中兴通讯股份有限公司 | The transmission method of primary and secondary synchronization signals in a kind of base station and new carrier wave |
| US9137797B2 (en) * | 2012-05-30 | 2015-09-15 | Intel Corporation | Techniques to manage heterogenous carrier types |
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| CN101009513A (en) * | 2006-01-26 | 2007-08-01 | 上海原动力通信科技有限公司 | Cell synchronization method and initial cell searching method for broadband time-division dual-duplex cellular system |
| CN101114877A (en) * | 2007-03-12 | 2008-01-30 | 中兴通讯股份有限公司 | Enhanced synchronous channel transmitting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101009513A (en) * | 2006-01-26 | 2007-08-01 | 上海原动力通信科技有限公司 | Cell synchronization method and initial cell searching method for broadband time-division dual-duplex cellular system |
| CN101114877A (en) * | 2007-03-12 | 2008-01-30 | 中兴通讯股份有限公司 | Enhanced synchronous channel transmitting method |
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