CN101577563B - Method, device and base station for transmitting PMCH in special subframe - Google Patents
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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 field of mobile communications technologies, and in particular, to a method, an apparatus, and a base station for transmitting a PMCH in a special subframe.
Background
An LTE (Long Term Evolution) system supports two Duplex modes, namely, FDD (Frequency Division Duplex) and TDD (Time Division Duplex), wherein the two Duplex modes use different frame structures; while the second type of frame structure (FS2) is only suitable for LTETDD systems, as shown in fig. 1, each radio frame consists of two half-frames (half-frames) that are 5ms long; wherein,
for a system with an up-conversion period and a down-conversion period of 5ms, each half frame comprises 4 subframes (subframe) with a length of 1ms and 3 special slots (special slots): DwPTS (downlink pilot time slot), GP (guard interval) and UpPTS (uplink pilot time slot), the total length of 3 special time slots is 1 ms;
for a system with an uplink and downlink switching period of 10ms, the first half frame comprises 4 subframes with a length of 1ms and 3 special time slots: DwPTS, GP and UpPTS; because the switching period is 10ms, the subframe 6 is no longer called a special time slot, but is a general downlink subframe, the second half frame only has 5 subframes with the length of 1 ms;
the length of the special time slot is configurable, and the subframe 0, the subframe 5 and the DwPTS are reserved for downlink transmission forever; transmitting downlink control signaling in the first 1-2 OFDM (Orthogonal frequency division Multiplexing) symbols in the DwPTS, for transmitting 72 center subcarriers on the third OFDM symbol on subframe 1 and subframe 6, which are always occupied by a primary synchronization signal of a cell initial search (cell search), as shown in fig. 2; except for the broadcast Channel (PBCH), any Downlink traffic may occupy the idle resource on the DwPTS slot or subframe 6 for transmission, such as a PDSCH (Physical Downlink Shared Channel), a PMCH (Physical multicast Channel), and the like.
Currently, a method for transmitting a PMCH in a common service subframe defined in the LTE standard includes the following contents: the PMCH only uses extended cp (extended cp), and occupies the whole frequency band, but cannot occupy subframe 0 and subframe 5 for transmission, and does not support transmit diversity; in addition, the PMCH performs layer (layer) mapping and precoding (precoding) based on a single antenna port, and uses antenna port 4 for transmission, and in a subframe for PMCH transmission, the first 1 or 2 OFDM symbols are reserved for unicast transmission for transmitting control signaling; the mapping pattern of the data transmitted on the antenna port 4 and the reference symbol is shown in fig. 3, where each square grid represents one RE (resource element), one modulation symbol is to be mapped to one RE, and R is4Representing MBSFN reference symbols, wherein the dedicated reference symbols of the cell only exist in the first 1-2 OFDM symbols for unicast transmission;
however, if the special subframe (special time slot DwPTS or subframe 6) for transmitting the primary synchronization signal is adopted for downlink PMCH transmission in the above manner, the primary synchronization signal always occupies 72 central subcarriers on the third OFDM symbol of the special subframe for transmission, and the MBSFN (multicast/multicast single frequency network) reference symbol used for PMCH demodulation also occupies the symbol, so that the two will collide on part of the subcarriers; at this time, the solution in the existing solution is to knock off the party with the collision; however, since all users in the cell use the primary synchronization signal to perform initial cell search, if the collided primary synchronization signal is knocked off, all users in the cell cannot perform initial cell search, which affects the normal operation of the system and causes system paralysis; however, since the frequency domain fading in the PMCH transmission channel varies dramatically, if the collided MBSFN reference signal is knocked out, the demodulation performance on the multicast channel will be seriously affected.
Disclosure of Invention
In view of this, the present invention provides a method, an apparatus, and a base station for transmitting a PMCH in a special subframe, so as to avoid a collision problem between a main synchronization signal and an MBSFN reference symbol during the PMCH transmission process.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
a method of transmitting a PMCH in a special subframe, comprising:
presetting a new MBSFN reference symbol mapping structure;
and carrying out resource mapping by using the new structure, and moving the mapped resources to the corresponding subcarriers for subsequent transmission.
Preferably, the new mapping structure is preset by adjusting the time domain position occupied by the MBSFN reference symbols in the original MBSFN reference symbol mapping structure.
Preferably, the time domain position of the reference symbol is adjusted by:
and shifting the reference symbols in the original MBSFN reference symbol mapping structure to the right by one OFDM symbol to reserve a third OFDM signal.
Preferably, the time domain position of the reference symbol is adjusted by:
and keeping the position of the central reference symbol in the original MBSFN reference symbol mapping structure unchanged, and shifting the reference symbol on the left side to the center.
Preferably, the shifting the reference symbol on the left side to the center is specifically:
the first column of reference symbols on the left side is shifted towards the center by 1 OFDM symbol, or the first column of reference symbols on the left side is shifted towards the center by 2 OFDM symbols, or the first column of reference symbols on the left side is shifted towards the center by 3 OFDM symbols.
Preferably, the method further comprises:
and while keeping the position of the central reference symbol in the original mapping structure unchanged and shifting the left reference symbol to the center, shifting the right reference symbol to the center by 1 OFDM symbol, or shifting the right reference symbol to the center by 2 OFDM symbols, or shifting the right reference symbol to the center by 3 OFDM symbols, or shifting the right reference symbol to the right by 1 OFDM symbol, or keeping the position of the right reference symbol unchanged.
Preferably, the resource mapping using the new structure includes:
and mapping the PMCH data symbols to all idle REs on the whole frequency band, mapping the MBSFN reference symbols to corresponding REs in a new structure, and mapping the main synchronization signal to the RE corresponding to the third OFDM symbol in the special subframe.
Preferably, the method further includes, before performing the resource mapping:
and judging the type of the transmission subframe, and when the transmission subframe is a special subframe, adopting a new reference symbol mapping structure to map resources.
A device for transmitting PMCH in a special subframe comprises a preset unit and a mapping unit; wherein,
the preset unit is used for: presetting a new MBSFN reference symbol mapping structure;
the mapping unit is configured to: and carrying out resource mapping by using the new structure, and moving the mapped resources to the corresponding subcarriers for subsequent transmission.
Preferably, the preset unit is further configured to: and presetting a new mapping structure by adjusting the time domain position occupied by the MBSFN reference symbols in the original MBSFN reference symbol mapping structure.
Preferably, the preset unit includes: a first shift unit and a second shift unit; wherein,
the first shift unit is used for: integrally right-shifting a reference symbol in an original MBSFN reference symbol mapping structure by one OFDM symbol to reserve a third OFDM signal;
the second shift unit is configured to: and when the position of the central reference symbol in the original MBSFN reference symbol mapping structure is kept unchanged, the reference symbol on the left side is shifted to the center.
Preferably, the second shift unit includes: a first processing unit and a second processing unit; wherein,
the first processing unit is configured to: shifting the first column of reference symbols on the left side by 1 OFDM symbol toward the center, or shifting the first column of reference symbols on the left side by 2 OFDM symbols toward the center, or shifting the first column of reference symbols on the left side by 3 OFDM symbols toward the center;
the second processing unit is configured to: and shifting the right reference symbol by 1 OFDM symbol toward the center, or shifting the right reference symbol by 2 OFDM symbols toward the center, or shifting the right reference symbol by 3 OFDM symbols toward the center, or shifting the right reference symbol by 1 OFDM symbol toward the right, or maintaining the position of the right reference symbol unchanged.
Preferably, the mapping unit includes: a third processing unit and a fourth processing unit; wherein,
the third processing unit is configured to: using the new structure to map the PMCH data symbols to all idle REs on the whole frequency band, mapping MBSFN reference symbols to corresponding REs in the new structure, and mapping a main synchronization signal to the RE corresponding to a third OFDM symbol in a special subframe;
the fourth processing unit is configured to: and moving the resource mapped by the third processing unit to the corresponding subcarrier for subsequent transmission.
Preferably, the apparatus further comprises: a judgment unit; wherein,
the judgment unit is used for: and judging the type of the transmission subframe, and informing a mapping unit to adopt a new reference symbol mapping structure to carry out resource mapping when the transmission subframe is a special subframe.
A base station comprising the apparatus of any of claims 9 to 14.
It can be seen that, by adopting the method, the device and the base station of the invention, through presetting a new MBSFN reference symbol mapping structure, the central 72 subcarriers on the third OFDM symbol in the special subframe are reserved for the main synchronization signal, and then the new structure is used for carrying out resource mapping and PMCH transmission, thus the collision problem between the main synchronization signal and the MBSFN reference symbol in the PMCH transmission process can be effectively avoided, and the PMCH detection performance is ensured, thereby improving the flexibility and efficiency of the system; after collision between the MBSFN reference symbol and the main synchronization signal is avoided, the MBSFN reference symbol does not need to be removed, and the demodulation performance on the multicast channel cannot be influenced in the process of transmitting out the PMCH; meanwhile, the problem of collision is solved, namely, a main synchronizing signal does not need to be knocked off, the initial cell search of all users in the cell is not influenced, and the system performance is improved.
Drawings
Fig. 1 is a schematic diagram of a frame structure in a system with an uplink and downlink switching period of 5ms in the prior art;
FIG. 2 is a diagram of a special subframe slot in the prior art;
FIG. 3 is a diagram of a MBSFN reference symbol mapping pattern in the prior art;
FIG. 4 is a schematic flow chart of the method of example 1 of the present invention;
FIG. 5 is a diagram of an offset MBSFN reference symbol mapping pattern in embodiment 1 of the present invention;
FIG. 6 is a diagram of a preferred embodiment of a centralized MBSFN reference symbol mapping pattern in embodiment 1 of the present invention;
FIG. 7 is a block diagram showing the structure of an apparatus according to embodiment 2 of the present invention.
Detailed Description
The basic idea of the invention is that by presetting a new MBSFN reference symbol mapping structure, the central 72 sub-carriers on the third OFDM symbol in the special subframe are reserved for a main synchronization signal, and the PMCH data symbol is occupied with all idle REs on the whole frequency band, and then resource mapping is carried out; the preset structure is based on the existing MBSFN reference symbol mapping structure of the LTE standard and is realized by adjusting the time domain position occupied by the MBSFN reference symbol; therefore, the problem of collision between a main synchronization signal and the MBSFN reference symbol in the process of transmitting the PMCH can be effectively solved, and meanwhile, the PMCH detection performance is ensured, so that the flexibility and efficiency of the system are improved.
In order that those skilled in the art will better understand the present invention, the method of the present invention will be described in detail below with reference to the accompanying drawings and specific examples.
step 401: presetting a new MBSFN reference symbol mapping structure;
the present embodiment proposes an existing MBSFN reference symbol mapping structure based on the LTE standard, and presets a new MBSFN reference symbol mapping structure by adjusting a time domain position occupied by an MBSFN reference symbol therein, but is not limited thereto, and may also be omitted in other manners; specifically, the original reference symbol is shifted to make it not occupy the third OFDM symbol in the special subframe, that is, the central 72 subcarriers on the third OFDM symbol in the special subframe are reserved for the main synchronization signal, and at the same time, the PMCH data symbol occupies all idle REs (i.e., REs not occupied by PDCCH (packet dedicated control channel), the main synchronization signal and the MBSFN reference symbol) on the whole frequency band, so as to facilitate resource mapping, and further support transmission of PMCH on the special subframe (DwPTS or subframe 6);
the embodiment further proposes to adjust the time domain position of the reference symbol according to the following method to avoid the collision problem between the primary synchronization signal and the MBSFN reference symbol:
1. an offset formula: i.e. the reference symbols in the original structure are wholly shifted to the right by one OFDM symbol:
as shown in fig. 5, the reference symbols in the original structure are wholly shifted to the right by one OFDM symbol, and at this time, no MBSFN reference symbol exists in the 3 rd OFDM symbol, so that collision between the MBSFN reference symbol and the main synchronization signal can be avoided, and the MBSFN reference symbol can be ensured to have the same performance as the existing structure when used in a subframe 6(10ms switching period) or a normal service subframe; wherein, the mapping pattern in the figure represents the mapping structure of the MBSFN reference symbols on 1 PRB (physical resource block) (comprising 12 subcarriers in frequency domain and 14 or 12 OFDM symbols in time domain);
2. centralized type: keeping the position of the second row of reference symbols in the original structure unchanged, and moving the reference symbols on the left side to the center; specifically, there are several cases:
shifting the first column of reference symbols on the left by 1 OFDM symbol toward the center, while keeping the position of the third column of reference symbols on the right unchanged, i.e., not shifted, although the third column of reference symbols on the right may also be shifted by 1 OFDM symbol to the left, or by 2 OFDM symbols to the left, or by 3 OFDM symbols to the left, or by 1 OFDM symbol to the right, and the specific shift may be adjusted as needed, which is not described herein again;
of course, in the above manner, the first column of reference symbols on the left may also be shifted to the center by 2 or 3 OFDM symbols, while the position of the third column of reference symbols on the right is kept unchanged, that is, not moved, and of course, the third column of reference symbols on the right may also be shifted to the left by 1 OFDM symbol, or to the left by 2 OFDM symbols, or to the left by 3 OFDM symbols, or the third column of reference symbols on the right may also be shifted to the right by 1 OFDM symbol, and the specific shift may be adjusted as needed, and is not described herein again;
in this embodiment, a preferred method is provided, as shown in fig. 6, the position of the second row of reference symbols is kept unchanged, the reference symbols on the left and right sides are respectively shifted to the center by 1 OFDM symbol, that is, the first row of reference symbols is shifted to the right by 1 OFDM symbol, the third row of reference symbols is shifted to the left by 1 OFDM symbol bit, and no MBSFN reference symbol exists in the 3 rd OFDM symbol in the structure shifted by this method, so that collision between the MBSFN reference symbol and the main synchronization signal can be avoided, and the structure adjusted by this method can better ensure the system performance of PMCH transmission in DwPTS, and can also ensure the performance similar to the existing structure when in subframe 6(10ms switching period) or a normal downlink service subframe; in addition, because part of the OFDM symbols at the tail of the mapping pattern are usually discarded when the resource mapping is performed according to different configurations of the DwPTS, the structure adjusted by this way can effectively reduce the probability that the reference symbol in the third column is discarded.
Step 402: performing resource mapping by using the preset new structure, and moving the mapped resources to corresponding subcarriers for subsequent transmission;
specifically, the PMCH data symbol, the MBSFN reference symbol, the primary synchronization signal, the PDCCH, the cell dedicated reference symbol, and the like are mapped onto corresponding resource units by using the preset new mapping structure: wherein, the PMCH data symbol occupies all idle REs (i.e. REs not occupied by PDCCH, primary synchronization signal and MBSFN reference symbol) on the whole frequency band; the MBSFN reference symbol occupies a new RE according to a preset structure, and does not occupy the RE mapped by a third OFDM symbol; the primary synchronization signal occupies the RE mapped by the third OFDM symbol in the special subframe; the cell dedicated reference symbol occupies the RE mapped by the first 1-2 OFDM symbols for unicast transmission;
and then moving the mapped resources to corresponding subcarriers for subsequent transmission: specifically, the resources occupied by the MBSFN reference symbols are moved to the subcarriers in the newly occupied OFDM symbols; the main synchronization signal is moved to the central 72 sub-carriers on the third OFDM symbol of the special sub-frame, so as to facilitate subsequent transmission; those skilled in the art can easily understand how to move the resources mapped by other data symbols to the corresponding subcarriers, which is not described herein again;
therefore, the collision between the MBSFN reference symbol and the main synchronization signal can be effectively avoided in the process of transmitting the PMCH by the mode; since the MBSFN reference symbol is a pilot symbol used by a receiving end in the PMCH channel for channel estimation, after collision between the MBSFN reference symbol and the main synchronization signal is avoided, the MBSFN reference symbol does not need to be knocked off, and demodulation performance on the multicast channel is not affected in the process of transmitting the PMCH; meanwhile, the problem of collision is solved, namely, a main synchronizing signal does not need to be knocked off, the initial cell search of all users in the cell is not influenced, and the system performance is improved.
In addition, before performing resource mapping, embodiment 1 of the present invention further includes the following determining step:
step 403: judging the type of the transmission subframe, and adopting a new reference symbol mapping structure to map resources when the transmission subframe is a special subframe; in particular, the method comprises the following steps of,
those skilled in the art can easily understand that, at the transmitting end, it can be easily known whether the subframe used for data transmission is a special subframe (transmitting a primary synchronization signal) or a normal subframe; when the subframe is judged to be a special subframe, adopting the preset new mapping mechanism to map resources; when the subframe is judged to be a common subframe, the original structure defined in the existing LTE standard can be used for resource mapping, and the new structure can also be used for resource mapping, wherein the original reserved bit is used for PMCH data symbol mapping.
It can be seen that, by adopting the method of the present invention, through presetting a new MBSFN reference symbol mapping structure, the central 72 subcarriers on the third OFDM symbol in the special subframe are reserved for the main synchronization signal, and then the new structure is used for resource mapping and PMCH transmission, so that the problem of collision between the main synchronization signal and the MBSFN reference symbol in the PMCH transmission process can be effectively avoided, and meanwhile, the PMCH detection performance is ensured, thereby improving the system flexibility and efficiency; after collision between the MBSFN reference symbol and the main synchronization signal is avoided, the MBSFN reference symbol does not need to be removed, and the demodulation performance on the multicast channel cannot be influenced in the process of transmitting out the PMCH; meanwhile, the problem of collision is solved, namely, a main synchronizing signal does not need to be knocked off, the initial cell search of all users in the cell is not influenced, and the system performance is improved.
Based on the above idea, embodiment 2 of the present invention further provides a device for transmitting a PMCH in a special subframe, as shown in fig. 7, including a presetting unit 701 and a mapping unit 702; wherein,
the preset unit 701 is configured to: presetting a new MBSFN reference symbol mapping structure;
the mapping unit 702 is configured to: and carrying out resource mapping by using the new structure, and moving the mapped resources to the corresponding subcarriers for subsequent transmission.
Furthermore, the preset unit is further configured to: and presetting a new mapping structure by adjusting the time domain position occupied by the MBSFN reference symbols in the original MBSFN reference symbol mapping structure.
In addition, the preset unit includes: a first shift unit and a second shift unit; wherein,
the first shift unit is used for: integrally right-shifting a reference symbol in an original MBSFN reference symbol mapping structure by one OFDM symbol to reserve a third OFDM signal;
the second shift unit is configured to: and when the position of the central reference symbol in the original MBSFN reference symbol mapping structure is kept unchanged, the reference symbol on the left side is shifted to the center.
Wherein the second shift unit includes: a first processing unit and a second processing unit;
the first processing unit is configured to: shifting the first column of reference symbols on the left side by 1 OFDM symbol toward the center, or shifting the first column of reference symbols on the left side by 2 OFDM symbols toward the center, or shifting the first column of reference symbols on the left side by 3 OFDM symbols toward the center;
the second processing unit is configured to: and shifting the right reference symbol by 1 OFDM symbol toward the center, or shifting the right reference symbol by 2 OFDM symbols toward the center, or shifting the right reference symbol by 3 OFDM symbols toward the center, or shifting the right reference symbol by 1 OFDM symbol toward the right, or maintaining the position of the right reference symbol unchanged.
Further, the mapping unit includes: a third processing unit and a fourth processing unit; wherein,
the third processing unit is used for: using the new structure to map the PMCH data symbols to all idle REs on the whole frequency band, mapping MBSFN reference symbols to corresponding REs in the new structure, and mapping a main synchronization signal to the RE corresponding to a third OFDM symbol in a special subframe;
the fourth processing unit is used for: and moving the resource mapped by the third processing unit to the corresponding subcarrier for subsequent transmission.
In addition, the apparatus further comprises: a judgment unit; wherein the judging unit is configured to: and judging the type of the transmission subframe, and informing a mapping unit to adopt a new reference symbol mapping structure to carry out resource mapping when the transmission subframe is a special subframe.
It should be noted that the apparatus described in the foregoing embodiment usually completes its corresponding functions in a base station, and therefore, a base station including the apparatus described in the foregoing embodiment of the present invention should also be included in the protection scope of the present invention, and detailed description thereof is omitted.
Those of skill in the art would understand that information, messages, and signals may be represented using any of a variety of different technologies and techniques. For example, the messages and information mentioned in the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or any combination thereof.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (13)
1. A method for transmitting a physical multicast channel, PMCH, in a special subframe, comprising:
presetting a new MBSFN reference symbol mapping structure by adjusting the time domain position occupied by the MBSFN reference symbol in the original multicast/multicast single frequency network MBSFN reference symbol mapping structure;
and mapping the PMCH data symbols to all idle resource units (REs) on the whole frequency band, mapping the MBSFN reference symbols to corresponding REs in the new structure, mapping the main synchronization signal to the REs corresponding to a third Orthogonal Frequency Division Multiplexing (OFDM) symbol in the special subframe, and moving the mapped resources to corresponding subcarriers for subsequent transmission.
2. The method of claim 1, wherein the time domain position of the reference symbol is adjusted by:
and shifting the reference symbols in the original MBSFN reference symbol mapping structure to the right by one OFDM symbol to reserve a third OFDM signal.
3. The method of claim 1, wherein the time domain position of the reference symbol is adjusted by:
and keeping the position of the central reference symbol in the original MBSFN reference symbol mapping structure unchanged, and shifting the reference symbol on the left side to the center.
4. Method according to claim 3, characterized in that said shifting the reference symbols of the left side towards the center is in particular:
the first column of reference symbols on the left side is shifted towards the center by 1 OFDM symbol, or the first column of reference symbols on the left side is shifted towards the center by 2 OFDM symbols, or the first column of reference symbols on the left side is shifted towards the center by 3 OFDM symbols.
5. The method of claim 3 or 4, further comprising:
and while keeping the position of the central reference symbol in the original mapping structure unchanged and shifting the left reference symbol to the center, shifting the right reference symbol to the center by 1 OFDM symbol, or shifting the right reference symbol to the center by 2 OFDM symbols, or shifting the right reference symbol to the center by 3 OFDM symbols, or shifting the right reference symbol to the right by 1 OFDM symbol, or keeping the position of the right reference symbol unchanged.
6. The method of claim 1, further comprising, before performing the resource mapping:
and judging the type of the transmission subframe, and when the transmission subframe is a special subframe, adopting a new reference symbol mapping structure to map resources.
7. The device for transmitting the PMCH in the special subframe is characterized by comprising a preset unit and a mapping unit; wherein,
the preset unit is used for: presetting a new MBSFN reference symbol mapping structure by adjusting the time domain position occupied by the MBSFN reference symbol in the original multicast/multicast single frequency network MBSFN reference symbol mapping structure;
the mapping unit is configured to: and mapping the PMCH data symbols to all idle resource units (REs) on the whole frequency band, mapping the MBSFN reference symbols to corresponding REs in the new structure, mapping the main synchronization signal to the REs corresponding to a third Orthogonal Frequency Division Multiplexing (OFDM) symbol in the special subframe, and moving the mapped resources to corresponding subcarriers for subsequent transmission.
8. The apparatus of claim 7, wherein:
the preset unit is further configured to: and presetting a new mapping structure by adjusting the time domain position occupied by the MBSFN reference symbols in the original MBSFN reference symbol mapping structure.
9. The apparatus of claim 8, wherein the preset unit comprises: a first shift unit and a second shift unit; wherein,
the first shift unit is used for: integrally right-shifting a reference symbol in an original MBSFN reference symbol mapping structure by one OFDM symbol to reserve a third OFDM signal;
the second shift unit is configured to: and when the position of the central reference symbol in the original MBSFN reference symbol mapping structure is kept unchanged, the reference symbol on the left side is shifted to the center.
10. The apparatus of claim 9, wherein the second shifting unit comprises: a first processing unit and a second processing unit; wherein,
the first processing unit is configured to: shifting the first column of reference symbols on the left side by 1 OFDM symbol toward the center, or shifting the first column of reference symbols on the left side by 2 OFDM symbols toward the center, or shifting the first column of reference symbols on the left side by 3 OFDM symbols toward the center;
the second processing unit is configured to: and shifting the right reference symbol by 1 OFDM symbol toward the center, or shifting the right reference symbol by 2 OFDM symbols toward the center, or shifting the right reference symbol by 3 OFDM symbols toward the center, or shifting the right reference symbol by 1 OFDM symbol toward the right, or maintaining the position of the right reference symbol unchanged.
11. The apparatus of claim 7, wherein the mapping unit comprises: a third processing unit and a fourth processing unit; wherein,
the third processing unit is configured to: using the new structure to map the PMCH data symbols to all idle REs on the whole frequency band, mapping MBSFN reference symbols to corresponding REs in the new structure, and mapping a main synchronization signal to the RE corresponding to a third OFDM symbol in a special subframe;
the fourth processing unit is configured to: and moving the resource mapped by the third processing unit to the corresponding subcarrier for subsequent transmission.
12. The apparatus of any one of claims 7 to 11, further comprising: a judgment unit; wherein,
the judgment unit is used for: and judging the type of the transmission subframe, and informing a mapping unit to adopt a new reference symbol mapping structure to carry out resource mapping when the transmission subframe is a special subframe.
13. A base station comprising the apparatus of any of claims 7 to 12.
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| CN2008101061647A CN101577563B (en) | 2008-05-07 | 2008-05-07 | Method, device and base station for transmitting PMCH in special subframe |
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| CN2008101061647A CN101577563B (en) | 2008-05-07 | 2008-05-07 | Method, device and base station for transmitting PMCH in special subframe |
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| CN101577563B true CN101577563B (en) | 2012-11-14 |
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| CN104718789B (en) * | 2012-10-04 | 2019-03-08 | 高通股份有限公司 | Handle the PMCH/PRS and EPDCCH in LTE |
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| CN102123022B (en) * | 2010-01-08 | 2015-04-01 | 中兴通讯股份有限公司 | Method and device for mapping demodulation reference signals (DMRS) |
| US8630253B2 (en) * | 2011-05-02 | 2014-01-14 | Futurewei Technologies, Inc. | System and method for mapping data symbols |
| WO2013166720A1 (en) * | 2012-05-11 | 2013-11-14 | Renesas Mobile 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 |
| CN107689858A (en) * | 2016-08-05 | 2018-02-13 | 株式会社Ntt都科摩 | Mapping and method, base station and the user equipment of detection broadcast channel |
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