CN101577563B - Method, device and base station for transmitting PMCH in special subframe - Google Patents
Method, device and base station for transmitting PMCH in special subframe Download PDFInfo
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Abstract
The invention provides a method for transmitting PMCH in a special subframe, which comprises the following steps: presetting a new MBSFN reference symbol mapping structure; and using the new structure for resource mapping, and moving mapped resources to corresponding subcarriers for subsequent transmission. The invention also provides a device and a base station for transmitting the PMCH in the special subframe. The method, the device and the base station of the invention effectively avoid the problem of collision between master synchronizing signals and MBSFN reference symbols in the process of transmitting the PMCH, simultaneously ensure PMCH detection performance so as to improve the flexibility and the efficiency of a system, and simultaneously do not influence the demodulation performance on multicast channels and the initial cell search of all users in cells so as to improve the performance of the system.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of in special subframe method, device and the base station of transmitting PMCH.
Background technology
LTE (Long Term Evolution, Long Term Evolution) system supports FDD (Frequency DivisionDuplex, FDD) and two kinds of duplex modes of TDD (Time Division Duplex, time division duplex), and two kinds of dual-modes use different frame structures; And second type of frame structure (FS2) only is applicable to the LTETDD system, and be as shown in Figure 1, and each radio frames is made up of the long field (half-frame) of two 5ms; Wherein,
For the uplink and downlink change-over period is the system of 5ms; Each field comprises subframe (subframe) and 3 special time slots (special slot): DwPTS (descending pilot frequency time slot), GP (protection at interval) and the UpPTS (uplink pilot time slot) that 4 1ms are long, and the length overall of 3 special time slots is 1ms;
For the uplink and downlink change-over period be the system of 10ms, first field comprises subframe and 3 special time slot: DwPTS, GP and UpPTS that 4 1ms are long; Because of switching cycle is 10ms, subframe 6 no longer is called special time slot, and is general descending sub frame, so second field has only the long subframe of 5 1ms;
Wherein, the length of special time slot is configurable, and subframe 0 is reserved as downlink transfer forever with subframe 5 and DwPTS; Preceding 1～2 OFDM (Orthogonal FrequencyDivision Multiplexing in the DwPTS time slot; OFDM) transmitting downlink control signal in the symbol; 72 center subcarriers that the master sync signal that is used to carry out cell initial search (cell serach) always takies on the 3rd the OFDM symbol on subframe 1 and the subframe 6 transmit, and are as shown in Figure 2; Except that broadcast channel (PBCH); The idling-resource that any downlink business all can take on this DwPTS time slot or the subframe 6 transmits; Like PDSCH (Physical Downlink Shared Channel; Physical down link sharing channel), PMCH (physical multicast channel, Physical Multicast Channel) etc.
The method of transmitting PMCH comprises that following content: PMCH only uses expansion CP (extended CP) in the general service subframe that defines in the LTE standard at present, and takes whole frequency band, transmits with subframe 5 but can not take subframe 0, does not support transmit diversity simultaneously; In addition, PMCH carries out layer (layer) mapping and precoding (percoding) based on the single antenna port, and uses antenna port 4 to transmit, and carries out keeping preceding 1 or 2 OFDM symbol and carrying out unicast transmission in the subframe of PMCH transmission, is used for control channel; Wherein, the mapping pattern of the data of transmission and reference symbol is as shown in Figure 3 on antenna port 4, and each grid is represented a RE (resource element, Resource Unit) among the figure, and a modulation symbol will be mapped on the RE R
4Expression MBSFN reference symbol, the sub-district dedicated reference symbols only is present in preceding 1～2 the OFDM symbol that carries out unicast transmission;
But; If adopt the special subframe (special time slot DwPTS or subframe 6) of transmission master sync signal to carry out descending PMCH transmission according to aforesaid way; 72 center subcarriers transmit on the 3rd OFDM symbol of special subframe because master sync signal always takies; And the employed MBSFN of demodulation PMCH (multicast/multicast single-frequency network network) reference symbol takies this symbol equally, so both will bump on the parton carrier wave; At this moment, the way that solves in the existing scheme is to destroy a side who bumps; But; Because all users utilize master sync signal to carry out cell initial search in the sub-district,, will make then that all users can't carry out cell initial search in the sub-district if destroy the master sync signal that bumps at this moment; And then influence the operate as normal of system, cause systemic breakdown; And,, will have a strong impact on the demodulation performance on the Multicast Channel if destroy the MBSFN reference signal that bumps this moment because the decline of PMCH transmission channel frequency domain changes acutely.
Summary of the invention
In view of this, the problem that the present invention solves provide a kind of in special subframe method, device and the base station of transmitting PMCH, avoided the collision problem of master sync signal and MBSFN reference symbol in the transmitting PMCH process.
For addressing the above problem, technical scheme provided by the invention is following:
A kind of in special subframe the method for transmitting PMCH, comprising:
Preset new MBSFN reference symbol mapping structure;
Use described new construction to carry out the resource mapping, and will accomplish the resource of shining upon and move on the subcarrier of correspondence so that carry out subsequent transmission.
Preferably, preset new mapping structure through adjusting the time-domain position that the MBSFN reference symbol takies in the former MBSFN reference symbol mapping structure.
Preferably, adjust the time-domain position of reference symbol through following step:
With the OFDM symbol that moves to right of the reference symbol integral body in the former MBSFN reference symbol mapping structure, make it to reserve the 3rd ofdm signal.
Preferably, adjust the time-domain position of reference symbol through following step:
Keep in the former MBSFN reference symbol mapping structure center reference character position constant, the reference symbol in left side is shifted to the center.
Preferably, said reference symbol with the left side is shifted to the center and is specially:
The first row reference symbol in left side is moved 1 OFDM symbol to the center, perhaps the first row reference symbol in left side is moved 2 OFDM symbols to the center, perhaps the first row reference symbol in left side is moved 3 OFDM symbols to the center.
Preferably, this method also comprises:
The center reference character position is constant in keeping former mapping structure; And with the reference symbol in left side when the center is shifted; The reference symbol on right side is moved 1 OFDM symbol to the center, perhaps the reference symbol on right side is moved 2 OFDM symbols to the center, perhaps the reference symbol on right side is moved 3 OFDM symbols to the center; Perhaps, perhaps keep the invariant position of the reference symbol on right side with the reference symbol on right side 1 the OFDM symbol that moves right.
Preferably, said use new construction carries out resource mapping and comprises:
The PMCH data symbol is mapped on the whole frequency band on all idle RE, the MBSFN reference symbol is mapped on the corresponding RE in the new structure, master sync signal is mapped in the special subframe on the 3rd the pairing RE of OFDM symbol.
Preferably, this method also comprises before carrying out the resource mapping:
Judge the transmission subframe type, when the transmission subframe is special subframe, adopt new reference symbol mapping structure to carry out the resource mapping.
A kind of in special subframe the device of transmitting PMCH, comprise preset unit and map unit; Wherein,
Said preset unit is used for: preset new MBSFN reference symbol mapping structure;
Said map unit is used for: use described new construction to carry out the resource mapping, and will accomplish the resource of shining upon and move on the subcarrier of correspondence so that carry out subsequent transmission.
Preferably, said preset unit is further used for: preset new mapping structure through adjusting the time-domain position that the MBSFN reference symbol takies in the former MBSFN reference symbol mapping structure.
Preferably, said preset unit comprises: first shift unit and second shift unit; Wherein,
Said first shift unit is used for: with the reference symbol integral body of the former MBSFN reference symbol mapping structure OFDM symbol that moves to right, make it to reserve the 3rd ofdm signal;
Said second shift unit is used for: when keeping former MBSFN reference symbol mapping structure center reference character position constant, the reference symbol in left side is shifted to the center.
Preferably, said second shift unit comprises: first processing unit and second processing unit; Wherein,
Said first processing unit is used for: the first row reference symbol in left side is moved 1 OFDM symbol to the center, perhaps the first row reference symbol in left side is moved 2 OFDM symbols to the center, perhaps the first row reference symbol in left side is moved 3 OFDM symbols to the center;
Said second processing unit is used for: the reference symbol on right side is moved 1 OFDM symbol to the center; Perhaps the reference symbol on right side is moved 2 OFDM symbols to the center; Perhaps the reference symbol on right side is moved 3 OFDM symbols to the center; Perhaps, perhaps keep the invariant position of the reference symbol on right side with the reference symbol on right side 1 the OFDM symbol that moves right.
Preferably, said map unit comprises: the 3rd processing unit and is managed the unit everywhere; Wherein,
Said the 3rd processing unit is used for: use said new construction that the PMCH data symbol is mapped to all idle RE on the whole frequency band; The MBSFN reference symbol is mapped on the corresponding RE in the new structure, master sync signal is mapped in the special subframe on the 3rd the pairing RE of OFDM symbol;
Said the manages the unit everywhere is used for: the resource that said the 3rd processing unit is accomplished mapping is moved on the subcarrier of correspondence so that carry out subsequent transmission.
Preferably, this device also comprises: judging unit; Wherein,
Said judging unit is used for: judge the transmission subframe type, when the transmission subframe was special subframe, the notice map unit adopted new reference symbol mapping structure to carry out the resource mapping.
A kind of base station comprises aforesaid right requirement 9 to 14 any described devices.
Can find out; Adopt method of the present invention, device and base station,, make in the special subframe that center 72 number of sub-carrier on the 3rd the OFDM symbol are kept for master sync signal through preset new MBSFN reference symbol mapping structure; Carry out the transmission of resource mapping and PMCH again with this new structure; Can effectively avoid the collision problem of master sync signal and MBSFN reference symbol in the transmitting PMCH process, and guarantee that simultaneously PMCH detects performance, thereby improve system flexibility and efficient; And after the collision of having avoided MBSFN reference symbol and master sync signal, also promptly need not to destroy the MBSFN reference symbol, in spreading out of the PMCH process, will can not influence the demodulation performance on the Multicast Channel; Solved the problem of collision simultaneously, also promptly need not to destroy master sync signal, also can not influence all users' in the sub-district cell initial search rope, and then improve the service system performance.
Description of drawings
Fig. 1 is that the up-downgoing switching cycle is the sketch map of frame structure in the system of 5ms in the prior art;
Fig. 2 is the time slot sketch map of special subframe in the prior art;
Fig. 3 is the sketch map that the MBSFN reference symbol is hinted obliquely at pattern in the prior art;
Fig. 4 is the method flow sketch map of the embodiment of the invention 1;
Fig. 5 is the sketch map of skew formula MBSFN reference symbol mapping pattern in the embodiment of the invention 1;
Fig. 6 is the sketch map of a kind of optimal way of centralized MBSFN reference symbol mapping pattern in the embodiment of the invention 1;
Fig. 7 is the apparatus structure schematic block diagram of the embodiment of the invention 2.
Embodiment
Basic thought of the present invention is through preset new MBSFN reference symbol mapping structure; Make in the special subframe center 72 number of sub-carrier on the 3rd the OFDM symbol keep for master sync signal; And the PMCH data symbol taken all idle RE on the whole frequency band, and then carry out the resource mapping; Wherein, above-mentioned preset structure is based on the existing MBSFN reference symbol mapping structure of LTE standard, and time-domain position that MBSFN reference symbol wherein takies realizes through adjusting; With this, can effectively avoid the collision problem of master sync signal and MBSFN reference symbol in the transmitting PMCH process, and guarantee that simultaneously PMCH detects performance, thereby improve system flexibility and efficient.
In order to make those skilled in the art better understand the present invention, method of the present invention is elaborated below in conjunction with accompanying drawing and specific embodiment.
The embodiment of the invention 1 provide a kind of in special subframe the method for transmitting PMCH, as shown in Figure 4, this method comprises:
Step 401: preset new MBSFN reference symbol mapping structure;
Present embodiment proposes based on the existing MBSFN reference symbol mapping structure of LTE standard; Preset new MBSFN reference symbol mapping structure through adjusting the time-domain position that MBSFN reference symbol wherein takies; But be not limited thereto, also can repeat no more through other modes this paper; Concrete; Former reference symbol is shifted; Make it not take the 3rd OFDM symbol in the special subframe, center 72 number of sub-carrier that are about in the special subframe on the 3rd the OFDM symbol are kept for master sync signal, simultaneously the PMCH data symbol are taken all idle RE on the whole frequency band (RE that is not promptly taken by PDCCH (grouping DCCH), master sync signal and MBSFN reference symbol); Shine upon conveniently to carry out resource, and then be supported in upward transmitting PMCH of special subframe (DwPTS or subframe 6);
Wherein, present embodiment also proposes the time-domain position according to following method adjustment reference symbol, to avoid the collision problem of master sync signal and MBSFN reference symbol:
1, skew formula: be about to reference symbol integral body in the original structure OFDM symbol that moves to right:
As shown in Figure 5; With the OFDM symbol that moves to right of reference symbol integral body in the original structure; No longer include MBSFN reference symbol in the 3rd OFDM symbol this moment; Can avoid said MBSFN reference symbol and master sync signal to bump with this, and can guarantee in subframe 6 (10ms switching cycle) or general service subframe, to use the time, have the performance identical with existing structure; What wherein, the mapping pattern was represented among the figure is the mapping structure that 1 PRB (Physical Resource Block) (comprise 12 number of sub-carrier on the frequency domain, comprise 14 or 12 OFDM symbols on the time domain) goes up the MBSFN reference symbol;
2, centralized: as to keep secondary series reference symbol invariant position in the original structure, the reference symbol in left side is moved to the center; Concrete, can be divided into several kinds of situation:
The first row reference symbol in left side is moved 1 OFDM symbol to the center; Keep the 3rd row reference symbol invariant position on right side simultaneously, promptly do not move; Certainly also can the 3rd row reference symbol on right side be moved to the left 1 OFDM symbol or be moved to the left 2 OFDM symbols or be moved to the left 3 OFDM symbols; 1 the OFDM symbol that also can the 3rd row reference symbol on right side be moved right in addition, concrete displacement can be adjusted as required, and this paper repeats no more;
Certainly; Can also the first row reference symbol in left side be moved 2 or 3 OFDM symbols to the center in the aforesaid way; Keep the 3rd row reference symbol invariant position on right side simultaneously, promptly do not move; Certainly also can the 3rd row reference symbol on right side be moved to the left 1 OFDM symbol or be moved to the left 2 OFDM symbols or be moved to the left 3 OFDM symbols; In addition also can be with the 3rd row reference symbol on right side with 1 the OFDM symbol that moves right, concrete displacement can be adjusted as required, and this paper repeats no more;
Wherein, Present embodiment has proposed a kind of preferred mode, and is as shown in Figure 6, keeps secondary series reference symbol invariant position; The reference symbol of the left and right sides is moved 1 OFDM symbol to the center respectively; Be about to the first row reference symbol, 1 the OFDM symbol that moves to right, the 3rd row reference symbol 1 the OFDM sign bit that moves to left no longer includes the MBSFN reference symbol in the 3rd OFDM symbol in the structure after this mode is shifted; Can avoid said MBSFN reference symbol and master sync signal to bump with this; And the adjusted structure of this mode can better guarantee in DwPTS, to carry out PMCH system for transmitting performance, and in subframe 6 (10ms switching cycle) or generic downlink service subframe the time, also can guarantee to have and the akin performance of existing structure; In addition, because when the resource mapping is carried out in configuration, tend to destroy the part of O FDM symbol of mapping pattern afterbody, so the adjusted structure of this kind mode can effectively reduce the probability that the 3rd row reference symbol is struck off according to the difference of DwPTS.
Step 402: use said preset new construction to carry out the resource mapping, and will accomplish the resource of shining upon and move on the subcarrier of correspondence so that carry out subsequent transmission;
Concrete; At first utilize above-mentioned preset new mapping structure that PMCH data symbol, MBSFN reference symbol, master sync signal, PDCCH, sub-district dedicated reference symbols etc. are mapped on the corresponding Resource Unit: wherein, the PMCH data symbol takes all idle RE on the whole frequency band (RE that is not promptly taken by PDCCH, master sync signal and MBSFN reference symbol); The MBSFN reference symbol takies new RE according to preset structure, and does not take the 3rd RE that the OFDM symbol is shone upon; Master sync signal takies the 3rd RE that the OFDM symbol is shone upon in the special subframe; The sub-district dedicated reference symbols takies the RE of preceding 1～2 OFDM sign map of carrying out unicast transmission;
The resource that to accomplish mapping is then moved on the subcarrier of correspondence so that carry out subsequent transmission: concrete, the resource that the MBSFN reference symbol takies is moved on the subcarrier in its OFDM symbol that newly takies; Master sync signal is moved on the 3rd OFDM symbol of special subframe on 72 number of sub-carrier of center, conveniently to carry out subsequent transmission; Those skilled in the art readily understand how the resource that other data symbols shone upon is moved on the subcarrier of correspondence, and this paper repeats no more;
In the transmitting PMCH process, can effectively avoid the collision of MBSFN reference symbol and master sync signal so, by the way; And because of the MBSFN reference symbol be the frequency pilot sign that receiving terminal is used to carry out channel estimating in the PMCH channel; So after the collision of having avoided MBSFN reference symbol and master sync signal; Also promptly need not to destroy the MBSFN reference symbol, in spreading out of the PMCH process, will can not influence the demodulation performance on the Multicast Channel; Solved the problem of collision simultaneously, also promptly need not to destroy master sync signal, also can not influence all users' in the sub-district cell initial search, and then improve the service system performance.
In addition, the embodiment of the invention 1 also comprises following determining step before carrying out the resource mapping:
Step 403: judge the transmission subframe type, when the transmission subframe is special subframe, adopt new reference symbol mapping structure to carry out the resource mapping; Concrete,
One of ordinary skill in the art will readily recognize that at transmitting terminal and can be easy to know that the subframe that is used for transfer of data is special subframe (transmission master sync signal) or common subframe; When judgement learns that said subframe is special subframe, adopt above-mentioned preset new mapping mechanism to carry out the resource mapping; When judgement learns that said subframe is common subframe, can use the original structure that defines in the existing LTE standard to carry out the resource mapping, also can use above-mentioned new structure to carry out the resource mapping, wherein, former reserved place will be used for the mapping of PMCH data symbol.
Can find out; Adopt method of the present invention,, make in the special subframe that center 72 number of sub-carrier on the 3rd the OFDM symbol are kept for master sync signal through preset new MBSFN reference symbol mapping structure; Carry out the transmission of resource mapping and PMCH again with this new structure; Can effectively avoid the collision problem of master sync signal and MBSFN reference symbol in the transmitting PMCH process, and guarantee that simultaneously PMCH detects performance, thereby improve system flexibility and efficient; And after the collision of having avoided MBSFN reference symbol and master sync signal, also promptly need not to destroy the MBSFN reference symbol, in spreading out of the PMCH process, will can not influence the demodulation performance on the Multicast Channel; Solved the problem of collision simultaneously, also promptly need not to destroy master sync signal, also can not influence all users' in the sub-district cell initial search rope, and then improve the service system performance.
Based on above-mentioned thought, the embodiment of the invention 2 proposed again a kind of in special subframe the device of transmitting PMCH, as shown in Figure 7, comprise preset unit 701 and map unit 702; Wherein,
Said preset unit 701 is used for: preset new MBSFN reference symbol mapping structure;
Said map unit 702 is used for: use described new construction to carry out the resource mapping, and will accomplish the resource of shining upon and move on the subcarrier of correspondence so that carry out subsequent transmission.
In addition, said preset unit is further used for: preset new mapping structure through adjusting the time-domain position that the MBSFN reference symbol takies in the former MBSFN reference symbol mapping structure.
In addition, said preset unit comprises: first shift unit and second shift unit; Wherein,
Said first shift unit is used for: with the reference symbol integral body of the former MBSFN reference symbol mapping structure OFDM symbol that moves to right, make it to reserve the 3rd ofdm signal;
Said second shift unit is used for: when keeping former MBSFN reference symbol mapping structure center reference character position constant, the reference symbol in left side is shifted to the center.
Wherein, said second shift unit comprises: first processing unit and second processing unit;
Said first processing unit is used for: the first row reference symbol in left side is moved 1 OFDM symbol to the center, perhaps the first row reference symbol in left side is moved 2 OFDM symbols to the center, perhaps the first row reference symbol in left side is moved 3 OFDM symbols to the center;
Said second processing unit is used for: the reference symbol on right side is moved 1 OFDM symbol to the center; Perhaps the reference symbol on right side is moved 2 OFDM symbols to the center; Perhaps the reference symbol on right side is moved 3 OFDM symbols to the center; Perhaps, perhaps keep the invariant position of the reference symbol on right side with the reference symbol on right side 1 the OFDM symbol that moves right.
In addition, said map unit comprises: the 3rd processing unit and is managed the unit everywhere; Wherein,
The 3rd processing unit is used for: use said new construction that the PMCH data symbol is mapped to all idle RE on the whole frequency band; The MBSFN reference symbol is mapped on the corresponding RE in the new structure, master sync signal is mapped in the special subframe on the 3rd the pairing RE of OFDM symbol;
The manages the unit everywhere is used for: the resource that said the 3rd processing unit is accomplished mapping is moved on the subcarrier of correspondence so that carry out subsequent transmission.
In addition, this device also comprises: judging unit; Wherein, said judging unit is used for: judge the transmission subframe type, when the transmission subframe was special subframe, the notice map unit adopted new reference symbol mapping structure to carry out the resource mapping.
It should be noted that normally its function corresponding of completion in the base station of the described device of the foregoing description, the base station that therefore comprises the described device of the embodiment of the invention also should be included within protection scope of the present invention, and concrete this paper repeats no more.
It will be understood by those skilled in the art that and to use in many different processes and the technology any one to come expression information, message and signal.For example, the message of mentioning in the above-mentioned explanation, information can be expressed as voltage, electric current, electromagnetic wave, magnetic field or magnetic particle, light field or above combination in any.
The professional can also further should be able to recognize; The unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein; Can realize with electronic hardware, computer software or the combination of the two; For the interchangeability of hardware and software clearly is described, the composition and the step of each example described prevailingly according to function in above-mentioned explanation.These functions still are that software mode is carried out with hardware actually, depend on the application-specific and the design constraint of technical scheme.The professional and technical personnel can use distinct methods to realize described function to each certain applications, but this realization should not thought and exceeds scope of the present invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
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 conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection range of the present invention.
Claims (13)
1. the method for a transmitting physical multicasting channel PMCH in special subframe is characterized in that, comprising:
Time-domain position through the MBSFN reference symbol of adjusting in former multicast/multicast single-frequency network network MBSFN reference symbol mapping structure takies is preset new MBSFN reference symbol mapping structure;
Use described new construction to carry out the resource mapping; Specifically comprise; The PMCH data symbol is mapped on the whole frequency band on all idle Resource Unit RE; The MBSFN reference symbol is mapped on the corresponding RE in the new structure, master sync signal is mapped on the 3rd the pairing RE of orthogonal frequency division multiplex OFDM symbol in the special subframe, and will accomplish the resource of shining upon and move on the subcarrier of correspondence so that carry out subsequent transmission.
2. method according to claim 1 is characterized in that, adjusts the time-domain position of reference symbol through following step:
With the OFDM symbol that moves to right of the reference symbol integral body in the former MBSFN reference symbol mapping structure, make it to reserve the 3rd ofdm signal.
3. method according to claim 1 is characterized in that, adjusts the time-domain position of reference symbol through following step:
Keep in the former MBSFN reference symbol mapping structure center reference character position constant, the reference symbol in left side is shifted to the center.
4. method according to claim 3 is characterized in that, said reference symbol with the left side is shifted to the center and is specially:
The first row reference symbol in left side is moved 1 OFDM symbol to the center, perhaps the first row reference symbol in left side is moved 2 OFDM symbols to the center, perhaps the first row reference symbol in left side is moved 3 OFDM symbols to the center.
5. according to claim 3 or 4 described methods, it is characterized in that this method also comprises:
The center reference character position is constant in keeping former mapping structure; And with the reference symbol in left side when the center is shifted; The reference symbol on right side is moved 1 OFDM symbol to the center, perhaps the reference symbol on right side is moved 2 OFDM symbols to the center, perhaps the reference symbol on right side is moved 3 OFDM symbols to the center; Perhaps, perhaps keep the invariant position of the reference symbol on right side with the reference symbol on right side 1 the OFDM symbol that moves right.
6. method according to claim 1 is characterized in that, this method also comprises before carrying out the resource mapping:
Judge the transmission subframe type, when the transmission subframe is special subframe, adopt new reference symbol mapping structure to carry out the resource mapping.
7. the device of a transmitting PMCH in special subframe is characterized in that, comprises preset unit and map unit; Wherein,
Said preset unit is used for: preset new MBSFN reference symbol mapping structure through adjusting the time-domain position that former multicast/the MBSFN reference symbol of multicast single-frequency network network MBSFN reference symbol mapping structure takies;
Said map unit is used for: use described new construction to carry out the resource mapping; Specifically comprise; The PMCH data symbol is mapped on the whole frequency band on all idle Resource Unit RE; The MBSFN reference symbol is mapped on the corresponding RE in the new structure, master sync signal is mapped on the 3rd the pairing RE of orthogonal frequency division multiplex OFDM symbol in the special subframe, and will accomplish the resource of shining upon and move on the subcarrier of correspondence so that carry out subsequent transmission.
8. device according to claim 7 is characterized in that:
Said preset unit is further used for: preset new mapping structure through adjusting the time-domain position that the MBSFN reference symbol takies in the former MBSFN reference symbol mapping structure.
9. device according to claim 8 is characterized in that, said preset unit comprises: first shift unit and second shift unit; Wherein,
Said first shift unit is used for: with the reference symbol integral body of the former MBSFN reference symbol mapping structure OFDM symbol that moves to right, make it to reserve the 3rd ofdm signal;
Said second shift unit is used for: when keeping former MBSFN reference symbol mapping structure center reference character position constant, the reference symbol in left side is shifted to the center.
10. device according to claim 9 is characterized in that, said second shift unit comprises: first processing unit and second processing unit; Wherein,
Said first processing unit is used for: the first row reference symbol in left side is moved 1 OFDM symbol to the center, perhaps the first row reference symbol in left side is moved 2 OFDM symbols to the center, perhaps the first row reference symbol in left side is moved 3 OFDM symbols to the center;
Said second processing unit is used for: the reference symbol on right side is moved 1 OFDM symbol to the center; Perhaps the reference symbol on right side is moved 2 OFDM symbols to the center; Perhaps the reference symbol on right side is moved 3 OFDM symbols to the center; Perhaps, perhaps keep the invariant position of the reference symbol on right side with the reference symbol on right side 1 the OFDM symbol that moves right.
11. device according to claim 7 is characterized in that, said map unit comprises: the 3rd processing unit and is managed the unit everywhere; Wherein,
Said the 3rd processing unit is used for: use said new construction that the PMCH data symbol is mapped to all idle RE on the whole frequency band; The MBSFN reference symbol is mapped on the corresponding RE in the new structure, master sync signal is mapped in the special subframe on the 3rd the pairing RE of OFDM symbol;
Said the manages the unit everywhere is used for: the resource that said the 3rd processing unit is accomplished mapping is moved on the subcarrier of correspondence so that carry out subsequent transmission.
12., it is characterized in that this device also comprises: judging unit according to any described device of claim 7 to 11; Wherein,
Said judging unit is used for: judge the transmission subframe type, when the transmission subframe was special subframe, the notice map unit adopted new reference symbol mapping structure to carry out the resource mapping.
13. a base station is characterized in that, comprises aforesaid right requirement 7 to 12 any described devices.
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| US20150109974A1 (en) * | 2012-05-11 | 2015-04-23 | Broadcom Corporation | System and Method for Reference Signal Transmission to Avoid Collision |
| CN103581840A (en) * | 2012-08-06 | 2014-02-12 | 普天信息技术研究院有限公司 | Transmission method and terminal for group calling service under direct mode operation |
| CN104009827B (en) * | 2013-02-22 | 2019-05-21 | 电信科学技术研究院 | A kind of transmission method and equipment of user equipment specific demodulated reference signal |
| CN104038311B (en) * | 2013-03-07 | 2017-09-29 | 电信科学技术研究院 | A kind of PMCH transmission methods and equipment |
| CN104144045B (en) * | 2013-05-09 | 2019-02-26 | 中兴通讯股份有限公司 | Carrier resource process method, device and system in the region MBSFN |
| CN104243115B (en) * | 2013-06-07 | 2017-08-25 | 电信科学技术研究院 | Physical Multicast Channel transmission method and equipment |
| WO2015042888A1 (en) * | 2013-09-27 | 2015-04-02 | 华为技术有限公司 | Method, apparatus and system for information transmission |
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