CN101771444A - Method for setting reference signals in multi-antenna system and base station - Google Patents
Method for setting reference signals in multi-antenna system and base station Download PDFInfo
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Abstract
The invention provides a method for setting reference signals in a multi-antenna system. In the method, a base station confirms a mapping pattern for transmitting downlink reference signals, wherein the mapping pattern comprises downlink reference signals mapped on a subcarrier group at different frequencies; the base station performs data mapping according to the mapping pattern and maps data to a corresponding antenna port; and the base station performs frequency hopping transmission on the downlink reference signals and transmits the mapped data through the multi-antenna system. By flexibly setting reference signals in the LTE-A system and configuring URS of the antenna port, the invention not only ensures the compatibility of the system, reduces the system complexity without affecting the performance and coverage of the system, but also reduces expenses caused by introducing reference signals to the minimum, improves the output of the system and improves the use ratio of the system to resources.
Description
Technical field
The present invention relates to the mobile communication technology field, the method to set up and the base station of reference signal in particularly a kind of multiaerial system.
Background technology
MIMO (Multiple-Input Multiple-Out-put, multiple-input and multiple-output) technology is played an important role in communication system of new generation as the important raising transmission quality and the physical layer multi-antenna technology of efficient.For example, transmit diversity, space multiplexing technique and BF multiple MIMO technology such as (Beam forming, beam shapings) has been applied in LTE (Long Term Evolution, the Long Term Evolution) system.
In present LTE system, transmit diversity and space diversity are supported 4 antenna ports at most, and adopt public reference signal to finish the demodulation of measuring with each antenna port signal; And wave beam forming adopts DRS (Dedicated Reference Signal) demodulation user data.As illustrated in fig. 1 and 2, be respectively the mapping schematic diagram of the descending public reference signal of conventional CP in the prior art LTE system (Cyclic Prefix, Cyclic Prefix) and expansion CP.LTE system descending public reference signal sends in each descending sub frame, covers the whole system bandwidth on frequency domain, in time across whole descending sub frame,
As illustrated in fig. 1 and 2, R0, R1, R2, R3 represent the public reference signal of antenna port 0-3 respectively among the figure.Public reference signal is mainly used in (the Physical Downlink SharedChannel to PDSCH, DSCH Downlink Shared Channel) PDCCH (Physical Downlink Control Channel, down control channel), PCFICH (Physical Control Format Indicator Channel, the control format indicating channel), PHICH (Physical Hybrid ARQ Indicator Channel, mixed automatic re-transmission indicating channel), PBCH (Physical Broadcast Channel, Physical Broadcast Channel) etc. demodulation, CQI (Channel Quality Indicator, CQI) estimates, non-excipient user's channel estimating, the measurement when switch the sub-district etc.Public reference signal is in the full bandwidth configuration, and conventional CP reference signal expense is 14.3%, and expansion CP is 16.7%.At present, LTE-A (LongTerm Evolution-Advanced, the high bandwidth Long Term Evolution) standardization effort of system carries out, and for satisfying the requirement of its peak rate, 8X8 MIMO, multithread BF antenna Enhanced Technology such as (for example double-current BF) has become critical technology.Yet complete in the plan of establishment of 4X4 antenna pilot if the 8X8 antenna pilot is provided with, so conventional CP reference signal expense will increase to 28.6%, and expansion CP will increase to 33.4%.This will cause the expense of reference signal excessive, influences the throughput of system, causes the wasting of resources.
Shown in Fig. 3 and 4, be respectively the configuration schematic diagram of conventional CP with the URS (UE-specific Reference Signal, user equipment specific reference signal) of expansion CP of antenna port 5 in the prior art LTE system, wherein R5 is a DRS (Dedicated Reference Signal).In prior LTE system, URS only supports the transmission of antenna port 5.The characteristics of this URS are only to transmit in the PDSCH channel, and be and UE (User Equipment, subscriber equipment) PDSCH channel width is identical, and promptly only in the PDSCH of certain UE internal transmission, the relevant function of PDSCH demodulation that is used for this UE realizes and enhancing.Therefore, if the standard according to present LTE system is configured in the LTE-A system, URS only takies the performance that antenna port 5 has just limited URS range of application and user greatly so.
Therefore, the URS how reference signal in the multiaerial system and configuration antenna port to be set becomes problem demanding prompt solution in the LTE-A system.The plan of establishment of reference signal not only will guarantee the performance of LTE-A system, guarantee that the precision that combined channel is estimated can not reduce, can the performance and the covering of system do not exerted an influence, also need to reduce as much as possible the expense of introducing by reference signal simultaneously, the throughput of raising system, the raising system is to resource utilization.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly solves the problem that is provided with of reference signal in the multiple antenna communication.
For achieving the above object, one aspect of the present invention has proposed the method to set up of reference signal in a kind of multiaerial system, may further comprise the steps:
The mapping pattern of downlink reference signal is determined to send in the base station, and described mapping pattern comprises that downlink reference signal is mapped on the sub carrier group of different frequency;
Data map is carried out according to described mapping pattern in described base station, and data map is arrived corresponding antenna port;
Described base station is carried out the frequency hopping transmission to described downlink reference signal and is sent, and the data after the mapping are sent through multiaerial system.
According to embodiments of the invention, described downlink reference signal comprises public reference signal or DRS (Dedicated Reference Signal).
According to embodiments of the invention, described downlink reference signal comprises the downlink reference signal of all users under the described base station, described base station lower part user's downlink reference signal or the part downlink reference signal of the user under the described base station.
According to embodiments of the invention, described downlink reference signal comprises the downlink reference signal of the antenna port of the downlink reference signal of the antenna port that described base station is whole or described base station portion.
According to embodiments of the invention, described base station determines that the mapping pattern that sends downlink reference signal comprises:
The density of the described downlink reference signal that antenna port sends is determined in described base station, when the density of finding described downlink reference signal is lower than predetermined threshold, selects described mapping pattern to comprise that described downlink reference signal is mapped on the sub carrier group of different frequency.
According to embodiments of the invention, described mapping pattern comprises:
Between per two time slots, between per two subframes or comprising between two above subframes that downlink reference signal is mapped on the sub carrier group of different frequency.
According to embodiments of the invention, described mapping pattern comprises:
Comprising between the time interval T that downlink reference signal is mapped on the sub carrier group of different frequency, described time interval T is less than the correlation time of downlink wireless channel.
According to embodiments of the invention, described downlink reference signal is mapped on the sub carrier group of different frequency and comprises:
The frequency hopping frequency domain interval of the subcarrier that the subcarrier of described downlink reference signal mapping and a last mapping are inequality is at least a subcarrier.
The present invention has proposed a kind of base station on the other hand, comprises mapping pattern determination module, data map module and sending module,
Described mapping pattern determination module is used for definite mapping pattern that sends downlink reference signal, and described mapping pattern comprises that downlink reference signal is mapped on the sub carrier group of different frequency;
Described data map module is used for carrying out data map according to described mapping pattern, and data map is arrived corresponding antenna port;
Described sending module is used for that described downlink reference signal is carried out the frequency hopping transmission and sends, and the data after the mapping are sent through multiaerial system.
According to embodiments of the invention, also comprise the selection module,
Described selection module, be used to select to carry out downlink reference signal, the type of described downlink reference signal and the antenna port of transmission of frequency hopping transmission, wherein said downlink reference signal comprises the downlink reference signal of all users under the described base station, described base station lower part user's downlink reference signal or the part downlink reference signal of the user under the described base station, described downlink reference signal comprises public reference signal or DRS (Dedicated Reference Signal), and the antenna port of described transmission comprises the antenna port that described base station is whole or the antenna port of described base station portion.
According to embodiments of the invention, described selection module is determined the density of the described downlink reference signal that antenna port sends, when the density of described downlink reference signal was lower than predetermined threshold, described selection module selected described mapping pattern to comprise that downlink reference signal is mapped on the sub carrier group of different frequency.
According to embodiments of the invention, also comprise indicating module,
Described indicating module is used for according to high-level signaling, indicates described sending module sending between per two time slots, between per two subframes or existing between two above subframes on the sub carrier group of downlink reference signal at different frequency.
According to embodiments of the invention, described indicating module is used for according to high-level signaling, indicate described sending module when frequency hopping is transmitted described downlink reference signal, the frequency hopping frequency domain interval of the subcarrier of described downlink reference signal carrying and the subcarrier of a last carrying is at least a subcarrier.
The present invention had both guaranteed the compatibility of system by the URS of reference signal and configuration antenna port is set neatly in the LTE-A system, also reduced system complexity.The plan of establishment of the reference signal that proposes according to the present invention, can not only guarantee the performance of LTE-A system, guarantee that the precision that combined channel is estimated can not reduce, can the performance and the covering of system do not exerted an influence, also reduce the expense of introducing by reference signal simultaneously as much as possible, the throughput of raising system, the raising system is to resource utilization.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the mapping schematic diagram of the descending public reference signal of conventional CP in the LTE system;
Fig. 2 is the mapping schematic diagram of the descending public reference signal of expansion CP in the LTE system;
Fig. 3 is the configuration schematic diagram of the URS of the conventional CP of antenna port 5 in the LTE system;
Fig. 4 is the configuration schematic diagram of URS of the expansion CP of antenna port 5 in the LTE system;
Fig. 5 is the method to set up flow chart of reference signal in the embodiment of the invention multiaerial system;
To be the embodiment of the invention adopt mapping pattern based on the time slot frequency hopping to the public guide frequency port of all 8 public reference signals to Fig. 6;
To be the embodiment of the invention adopt mapping pattern based on the subframe frequency hopping to the 4-7 public guide frequency port of 4 public reference signals to Fig. 7;
Fig. 8 is the embodiment of the present invention to the mapping pattern of user terminal;
Fig. 9 is the present invention another embodiment to the mapping pattern of user terminal;
Figure 10 is the structural representation of embodiment of the invention base station.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
The present invention proposes the method to set up of reference signal in a kind of multiaerial system, may further comprise the steps:
The mapping pattern of downlink reference signal is determined to send in the base station, and described mapping pattern comprises that downlink reference signal is mapped on the sub carrier group of different frequency; Data map is carried out according to described mapping pattern in described base station, and data map is arrived corresponding antenna port; Described base station is carried out the frequency hopping transmission to described downlink reference signal and is sent, and the data after the mapping are sent through multiaerial system.
Usually, the mapping pattern of the reference signal of existing system is fixing, promptly can't rationally adjust the stepped-frequency interval of transmission of reference signals according to channel condition, the present invention is by being provided with the URS of reference signal and configuration antenna port neatly, the stepped-frequency interval of reference signal rationally is set, make reference signal obtain frequency diversity gain, user terminal receives above-mentioned reference signal can obtain the good channel estimated quality.
As shown in Figure 5, the method to set up flow chart for reference signal in the embodiment of the invention multiaerial system may further comprise the steps:
Step S501, the mapping pattern of downlink reference signal is determined in the base station, mapping pattern comprises that downlink reference signal is mapped on the sub carrier group of different frequency.
Based on above analysis, if the standard according to present LTE system is configured in the LTE-A system, the 8X8 antenna pilot is provided with complete in the plan of establishment of 4X4 antenna pilot, and so conventional CP reference signal expense will increase to 28.6%, and expansion CP will increase to 33.4%.This will cause the expense of reference signal excessive, influences the throughput of system, causes the wasting of resources, and URS only takies the performance that antenna port 5 has just limited URS range of application and user greatly.
When 8 aerial transmission systems under the good scene of channel condition, can consider to use the design of lower reference signal density.For example, carry out frequency hopping according to odd even time slot or odd even subframe and handle and obtain frequency and time diversity gain, improve the quality of channel estimating.In addition, can also can make the interference among adjacent cells randomization, avoid interference by adopting different frequency hop sequences at neighbor cell.
As embodiments of the invention, downlink reference signal is mapped on the sub carrier group of different frequency, and downlink reference signal comprises public reference signal or DRS (Dedicated Reference Signal).8 aerial transmission systems with the LTE-A system are example, the base station sends public reference signal or DRS (Dedicated Reference Signal) to user terminal, wherein terminal adopts public reference signal to finish the demodulation of measuring with each antenna port signal, adopts DRS (Dedicated Reference Signal) demodulation user wave beam figuration data.
In the LTE-A system, when the public reference signal density of 0-7 antenna port all when low, can all adopt the frequency hopping design by all of the port.When the part port, for example 0-3 public guide frequency density is not then carried out the configuration of frequency hopping than condition with higher, a port 4-7 lower to density, and perhaps minimum port 6 and 7 carries out frequency hopping.Fine when channel condition, for example under the situation that LOS (Line of Sight, straight line sighting distance) and rate travel are very low, even the very low pilot frequency design of density also can be accepted, all of the port can all not wanted frequency hopping yet so.
As embodiments of the invention, when the base station determines whether to take frequency hopping transmission to send to downlink reference signal, can be by judging the density of the downlink reference signal that antenna port sends, when the density of finding downlink reference signal is lower than predetermined threshold, promptly take the frequency hopping transmission to send to downlink reference signal, at this moment the definite mapping pattern in base station comprises that downlink reference signal is mapped on the sub carrier group of different frequency.Wherein the distribution mode of reference signal can be even or non-uniform Distribution.Obviously, the predetermined threshold that compares to downlink reference signal can be provided with according to system requirements, for example, this predetermined threshold is the shared specific expense ratio of transmission of reference signals, 14.3% or 16.7%, when the base station finds that downlink reference signal is lower than predetermined threshold, take this downlink reference signal is carried out the frequency hopping transmission.
As embodiments of the invention, as shown in Figure 6, for the public guide frequency port to all 8 public reference signals all adopts mapping pattern based on the time slot frequency hopping, wherein, R0, R1, R2, R3, R4, R5, R6, R7 are respectively the open reference signal of open port 0-7.Under the not high enough situation of pilot density, the cycle, very little frequency hopping can improve frequency diversity, thereby reached better channel estimating.
As embodiments of the invention, as shown in Figure 7, for the 4-7 public guide frequency port of 4 public reference signals being adopted mapping pattern, wherein based on the subframe frequency hopping, R0, R1, R2, R3 are respectively the reference signal of port 0-3, and 4,5,6,7 are respectively the reference signal of port 4-7.In Fig. 7, public port 0-3 is not adopted any frequency hopping configuration, the every subframe of port 4-7 is carried out the frequency hopping transmission, the frequency hopping pattern is as shown in Figure 7.With respect to embodiment shown in Figure 6, the hop period in the present embodiment has increased one times, and hop period is bigger.If in the time span of a PRB, constant when channel meets (Time Invariant) characteristic, just correlation time (Coherence Time) is greater than the time span of a PRB, frequency hopping so as shown in Figure 7 still can obtain frequency diversity gain, makes terminal receive and can obtain the good channel estimated quality.Obviously, as long as comprising between the time interval T that downlink reference signal is mapped on the sub carrier group of different frequency, described time interval T is less than the correlation time of downlink wireless channel, then described downlink reference signal will obtain frequency diversity gain, makes terminal receive and can obtain the good channel estimated quality.
In addition, downlink reference signal is adopted transmission plan based on frequency hopping, comprise that downlink reference signal to all users under this base station adopts the transmission plan based on frequency hopping; Comprise this lower part, base station user's downlink reference signal is adopted transmission plan based on frequency hopping,, select corresponding user's downlink reference signal to transmit based on frequency hopping promptly according to system requirements or system configuration; Comprise that also the part downlink reference signal to the user under this base station transmits based on frequency hopping, promptly only public reference signal, described user's DRS (Dedicated Reference Signal) or described user's part DRS (Dedicated Reference Signal) are transmitted based on frequency hopping.
In addition, in specific embodiment,, can realize that by the downlink transfer of the whole antenna port in base station the downlink transfer of perhaps passing through the antenna port of base station portion realizes to the transmission plan of downlink reference signal employing based on frequency hopping.
In downlink reference signal being carried out the frequency hopping transmission, the frequency hopping frequency domain interval of the subcarrier that the subcarrier of described downlink reference signal mapping and a last mapping are inequality is at least a subcarrier.Obviously, the frequency hopping frequency domain interval can be provided with according to system requirements.
Usually, reference signal is carried transmission by one or more sub carrier group, and in technical scheme of the present invention, when transmission of reference signals next time, one or more sub carrier group overall offset experimental process carrier waves of carrying reference signal are realized the frequency hopping transmission.As embodiments of the invention, as shown in Figure 8, be an embodiment to the mapping pattern of user terminal, wherein R0, R1, R2, R3 represent the public reference signal of 4 public ports respectively, and 4,5,6,7 represent the DRS (Dedicated Reference Signal) of 4 private ports respectively.The frequency hopping pattern as shown in Figure 8, public reference signal R0, the R1 frequency hopping time interval are 4 RE, the frequency hopping time interval of public reference signal R2, R3 and DRS (Dedicated Reference Signal) 4-7 is 7 RE; Public reference signal R0, R1, R2,2 RE of R3 frequency hopping frequency domain interval, 2 RE of DRS (Dedicated Reference Signal) 4 frequency hopping frequency domain interval, 3 RE of DRS (Dedicated Reference Signal) 5-7 frequency hopping frequency domain interval.
In downlink reference signal being carried out the frequency hopping transmission, can carry out the frequency hopping transmission to downlink reference signal between per two time slots, between per two subframes or between two above subframes, promptly the frequency hopping time interval to downlink reference signal can be provided with according to system requirements.
As embodiments of the invention, as shown in Figure 9, be an embodiment to the mapping pattern of user terminal, wherein R0, R1, R2, R3 represent the public reference signal of 4 public ports respectively, and 4,5,6,7 represent the DRS (Dedicated Reference Signal) of 4 private ports respectively.In the present embodiment, with respect to the embodiment of Fig. 8,4 private ports have reduced the density of pilot tone in a subframe, and DRS (Dedicated Reference Signal) carries out the frequency hopping transmission between subframe.
Step S502, data map is carried out according to mapping pattern in the base station, and data map is arrived corresponding antenna port.
In step S502, the mapping pattern of utilizing step S501 to determine, data map is carried out in the base station, and data map is arrived corresponding antenna port.Wherein, the base station can be adopted the transmission plan based on frequency hopping to the downlink reference signal of all users under this base station, and downlink reference signal is mapped to corresponding antenna port.The base station also can be adopted the transmission plan based on frequency hopping to this lower part, base station user's downlink reference signal, promptly according to system requirements or system configuration, selects corresponding user's downlink reference signal to be mapped to corresponding antenna port.In addition, the base station can also be transmitted based on frequency hopping the part downlink reference signal of the user under this base station, promptly only public reference signal, described user's DRS (Dedicated Reference Signal) or described user's part DRS (Dedicated Reference Signal) is mapped to corresponding antenna port.
In addition, in specific embodiment, to the transmission plan of downlink reference signal employing based on frequency hopping, can carry out data map by the whole antenna port in base station, perhaps the antenna port by base station portion carries out data map.
Step S503, the data after the base station will be shone upon send through multiaerial system.
In said method, by the reference signal of reference signal and configuration antenna port is set neatly, both guaranteed the compatibility of system, also reduced system complexity.The plan of establishment according to above-mentioned reference signal, can not only guarantee the performance of LTE-A system, guarantee that the precision that combined channel is estimated can not reduce, can the performance and the covering of system do not exerted an influence, also reduce the expense of introducing by reference signal simultaneously as much as possible, the throughput of raising system, the raising system is to resource utilization.
The invention allows for a kind of base station, as shown in figure 10, be the structural representation of embodiment of the invention base station.This base station comprises mapping pattern determination module 100, data map module 200 and sending module 300.
Wherein, mapping pattern determination module 100 is used for determining to send the mapping pattern of downlink reference signal, and mapping pattern comprises that downlink reference signal is mapped on the sub carrier group of different frequency; Data map module 200 is used for carrying out data map according to mapping pattern, and data map is arrived corresponding antenna port; Sending module 300 is used for that downlink reference signal is carried out the frequency hopping transmission and sends, and the data after the mapping are sent through multiaerial system.
As embodiments of the invention, above-mentioned base station equipment also comprises selects module 400.Select module 400 to be used to select to carry out downlink reference signal, the type of downlink reference signal and the antenna port of transmission of frequency hopping transmission, wherein downlink reference signal comprises the downlink reference signal of all users under the base station, lower part, base station user's downlink reference signal or the part downlink reference signal of the user under the base station, downlink reference signal comprises public reference signal or DRS (Dedicated Reference Signal), and the antenna port of transmission comprises the antenna port that the base station is whole or the antenna port of base station portion.
As embodiments of the invention, select module 400 to determine the density of the downlink reference signal that antenna port sends, when the density of finding downlink reference signal was lower than predetermined threshold, the mapping pattern of selecting module 400 to select comprised that downlink reference signal is mapped on the sub carrier group of different frequency.Wherein the distribution mode of reference signal can be even or non-uniform Distribution.Obviously, the predetermined threshold that compares to downlink reference signal can be provided with according to system requirements, for example, this predetermined threshold is the shared specific expense ratio of transmission of reference signals, 14.3% or 16.7%, when the base station finds that downlink reference signal is lower than predetermined threshold, to take this downlink reference signal is carried out the frequency hopping transmission, the mapping pattern of promptly at this moment selecting module 400 to select comprises that downlink reference signal is mapped on the sub carrier group of different frequency.
As embodiments of the invention, above-mentioned base station equipment also comprises indicating module 500.Indicating module 500 is used for according to high-level signaling, and indication sending module 300 is sending between per two time slots, between per two subframes or existing between two above subframes on the sub carrier group of downlink reference signal at different frequency.
As embodiments of the invention, indicating module 500 also is used for according to high-level signaling, indication sending module 300 is at frequency hopping transmission downlink reference signal the time, and the frequency hopping frequency domain interval of the subcarrier of downlink reference signal carrying and the subcarrier of a last carrying is at least a subcarrier.
Above-mentioned base station equipment disclosed by the invention, by the URS of reference signal and configuration antenna port is set neatly, both guaranteed the compatibility of system, also reduced system complexity, guarantee that the precision that the user terminal combined channel is estimated can not reduce, can the performance and the covering of system do not exerted an influence, also reduce the expense of introducing by reference signal simultaneously as much as possible, the throughput of raising system, the raising system is to resource utilization.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification that scope of the present invention is by claims and be equal to and limit to these embodiment.
Claims (13)
1. the method to set up of reference signal in the multiaerial system is characterized in that, may further comprise the steps:
The mapping pattern of downlink reference signal is determined to send in the base station, and described mapping pattern comprises that downlink reference signal is mapped on the sub carrier group of different frequency;
Data map is carried out according to described mapping pattern in described base station, and data map is arrived corresponding antenna port;
Described base station is carried out the frequency hopping transmission to described downlink reference signal and is sent, and the data after the mapping are sent through multiaerial system.
2. the method to set up of reference signal is characterized in that in the multiaerial system as claimed in claim 1, and described downlink reference signal comprises public reference signal or DRS (Dedicated Reference Signal).
3. the method to set up of reference signal in the multiaerial system as claimed in claim 1, it is characterized in that described downlink reference signal comprises the downlink reference signal of all users under the described base station, described base station lower part user's downlink reference signal or the part downlink reference signal of the user under the described base station.
4. the method to set up of reference signal is characterized in that in the multiaerial system as claimed in claim 1, and described downlink reference signal comprises the downlink reference signal of the antenna port of the downlink reference signal of the antenna port that described base station is whole or described base station portion.
5. the method to set up of reference signal is characterized in that in the multiaerial system as claimed in claim 1, and described base station determines that the mapping pattern that sends downlink reference signal comprises:
The density of the described downlink reference signal that antenna port sends is determined in described base station, when the density of finding described downlink reference signal is lower than predetermined threshold, selects described mapping pattern to comprise that described downlink reference signal is mapped on the sub carrier group of different frequency.
6. as the method to set up of reference signal in the described multiaerial system of one of claim 1 to 5, it is characterized in that described mapping pattern comprises:
Between per two time slots, between per two subframes or comprising between two above subframes that downlink reference signal is mapped on the sub carrier group of different frequency.
7. the method to set up of reference signal is characterized in that in the multiaerial system as claimed in claim 6, and described mapping pattern comprises:
Comprising between the time interval T that downlink reference signal is mapped on the sub carrier group of different frequency, described time interval T is less than the correlation time of downlink wireless channel.
8. the method to set up of reference signal is characterized in that in the multiaerial system as claimed in claim 7, and described downlink reference signal is mapped on the sub carrier group of different frequency and comprises:
The frequency hopping frequency domain interval of the subcarrier that the subcarrier of described downlink reference signal mapping and a last mapping are inequality is at least a subcarrier.
9. a base station is characterized in that, comprises mapping pattern determination module, data map module and sending module,
Described mapping pattern determination module is used for definite mapping pattern that sends downlink reference signal, and described mapping pattern comprises that downlink reference signal is mapped on the sub carrier group of different frequency;
Described data map module is used for carrying out data map according to described mapping pattern, and data map is arrived corresponding antenna port;
Described sending module is used for that described downlink reference signal is carried out the frequency hopping transmission and sends, and the data after the mapping are sent through multiaerial system.
10. base station as claimed in claim 9 is characterized in that, also comprises the selection module,
Described selection module, be used to select to carry out downlink reference signal, the type of described downlink reference signal and the antenna port of transmission of frequency hopping transmission, wherein said downlink reference signal comprises the downlink reference signal of all users under the described base station, described base station lower part user's downlink reference signal or the part downlink reference signal of the user under the described base station, described downlink reference signal comprises public reference signal or DRS (Dedicated Reference Signal), and the antenna port of described transmission comprises the antenna port that described base station is whole or the antenna port of described base station portion.
11. base station as claimed in claim 10, it is characterized in that, described selection module is determined the density of the described downlink reference signal that antenna port sends, when the density of described downlink reference signal was lower than predetermined threshold, described selection module selected described mapping pattern to comprise that downlink reference signal is mapped on the sub carrier group of different frequency.
12. base station as claimed in claim 11 is characterized in that, also comprises indicating module,
Described indicating module is used for according to high-level signaling, indicates described sending module sending between per two time slots, between per two subframes or existing between two above subframes on the sub carrier group of downlink reference signal at different frequency.
13. base station as claimed in claim 12, it is characterized in that, described indicating module is used for according to high-level signaling, indicate described sending module when frequency hopping is transmitted described downlink reference signal, the frequency hopping frequency domain interval of the subcarrier of described downlink reference signal carrying and the subcarrier of a last carrying is at least a subcarrier.
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Cited By (17)
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