CN103096479A - Sending method and equipment of up link demodulation reference signals - Google Patents
Sending method and equipment of up link demodulation reference signals Download PDFInfo
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- CN103096479A CN103096479A CN2011103437929A CN201110343792A CN103096479A CN 103096479 A CN103096479 A CN 103096479A CN 2011103437929 A CN2011103437929 A CN 2011103437929A CN 201110343792 A CN201110343792 A CN 201110343792A CN 103096479 A CN103096479 A CN 103096479A
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Abstract
The invention discloses a sending method and equipment of up link demodulation reference signals. The sending method of the up link demodulation reference signals comprises: when a coverage area of signals of a transmitting terminal is an indoor application scenario, the transmitting terminal sends the upper demodulation reference signals, only a single carrier frequency division multiple access (SC-PDMA) symbol is occupied on a transmission layer of a receiving terminal on a subframe, and/or the transmitting terminal sends the up link demodulation reference signals, and only partial bandwidth of system entire bandwidth is occupied on the transmission layer of the receiving terminal. Through the sending method and the equipment of the up link demodulation reference signals, expenditures of the up link demodulation reference signals are saved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of sending method and equipment of uplink demodulation reference signal.
Background technology
Reference signal (Reference Signal, RS) is exactly the pilot signal of often saying, is to offer by transmitting terminal a kind of known signal that receiving terminal is used for channel estimating or channel detection.
In LTE R8 system, uplink air interface is based on (Single-carrier Frequency Division Multiplex Access, the SC-FDMA) of single-carrier frequency division multiple access, so the LTER8 up-link is the SC-FDMA system.Because wireless channel is fading channel, user's two-forty move the time domain channel that can cause the SC-FDMA system change very fast, the decline of generation time selectivity; And multipath effect can cause the frequency domain selectivity decline of SC-FDMA system.Therefore, need to insert the RS signal in the uplink data channels (Physical uplink shared channel, PUSCH) of LTE R8 system, data channel is followed the tracks of and estimated.
In the running time-frequency resource of SC-FDMA system, the RS signal is take resource particle (Resource Element, RE) as unit, and RS symbol takies a RE on the SC-FDMA running time-frequency resource, i.e. OFDM symbol on subcarrier and time domain on frequency domain.
In LTE R8 system, uplink transmission mode can only support the single antenna port to send, so the uplink demodulation reference signal of LTER8 (Demodulation reference signal, DMRS) can only be supported the PUSCH transfer of data of single current.The up DMRS signal of LTE R8 system takies the two row SC-FDMA symbols of Slot 0 and Slot 1 on a subframe time domain, on the frequency domain resource that system call is distributed, take continuously the whole bandwidth of SC-FDMA symbol.Fig. 1 and Fig. 2 have indicated respectively the resource mapping relation of the uplink demodulation reference signal in regular circulation prefix (Normal CP, NCP) and the lower LTE R8 PUSCH of the system transfer of data of extended cyclic prefix (Extended CP, ECP).
Fig. 1 is the uplink demodulation reference signal ideograph that adopts NCP when carrying out the PUSCH transfer of data in LTE R8 system.
In Fig. 1, transmitting terminal sends uplink demodulation reference signal on the 4th SC-FDMA symbol of the 4th SC-FDMA symbol of the time slot 0 of a subframe time domain and time slot 1.
Fig. 2 is the uplink demodulation reference signal ideograph that adopts ECP when carrying out the PUSCH transfer of data in LTE R8 system.
In Fig. 2, transmitting terminal sends uplink demodulation reference signal on the 3rd SC-FDMA symbol of the 3rd SC-FDMA symbol of the time slot 0 of a subframe time domain and time slot 1.
By Fig. 1 and Fig. 2 as seen, the up DMRS in LTE R8 system on the PUSCH data channel has taken all carrier resources of dispatching on 2 SC-FDMA symbols of sub-frame of uplink, and the expense that uplink demodulation reference signal takies is larger.
In LTE R8 system, uplink transmission mode can only support the single antenna port to send, so the up DMRS of LTE R8 can only support the transfer of data of single current.Evolve to LTE R9/R10 release phase, up MIMO multi-antenna transmission and multithread (Layer) transfer of data supported, introduce quadrature mask (Orthogonal Cover Code on capable DMRS signal by listing in 2 of same subframe, OCC), can be on two identical row SC-FDMA sign resources, realize the Orthogonal Frequency Division Multiplexing of the uplink demodulation pilot tone of a plurality of ports, to support a plurality of data flow in alone family (Layer) or multi-user's transfer of data.
The resource overhead that in LTE R9/R10 system, up DMRS signal takies is identical with LTE R8 system, for example the demodulated reference signal mode figure of employing NCP shown in Figure 3.
Fig. 3 is the demodulated reference signal mode figure that LTE R9/R10 system adopts NCP when carrying out the PUSCH transfer of data.
As seen, the up DMRS signal overhead of existing LTE R8 system and LTE R9/R10 system is all larger.
Summary of the invention
In view of this, the invention provides a kind of sending method and equipment of uplink demodulation reference signal, to save the expense of uplink demodulation reference signal.
Technical scheme of the present invention specifically is achieved in that
A kind of sending method of uplink demodulation reference signal, the method comprises:
When the signal cover of transmitting terminal is indoor application scenarios, this transmitting terminal is that a transport layer of a receiving terminal only takies a SC-FDMA symbol transmission uplink demodulation reference signal on a subframe, and/or transmitting terminal is the part bandwidth transmission uplink demodulation reference signal that a transport layer of a receiving terminal only takies system's full bandwidth.
It is that in indoor application scenarios, this equipment comprises sending module that a kind of transmitting apparatus of uplink demodulation reference signal, this equipment are applied in signal cover;
Described sending module, only take a SC-FDMA symbol for a transport layer that is a receiving terminal on a subframe and send uplink demodulation reference signal, and/or, be that the part bandwidth that a transport layer of a receiving terminal only takies system's full bandwidth sends uplink demodulation reference signal.
As seen from the above technical solution, the present invention is under specific application scenarios, specifically under the signal cover of transmitting terminal is indoor application scenarios, time domain and frequency domain characteristic according to this scene lower channel, transmitting terminal is when being a transport layer transmission uplink demodulation reference signal, on time domain, a SC-FDMA symbol that only takies on a subframe sends the uplink demodulation signal, and/or, on frequency domain, the part bandwidth that only takies system's full bandwidth sends uplink demodulation reference signal, thus the expense of saving uplink demodulation reference signal from time domain and/or frequency domain.
Description of drawings
Fig. 1 is the demodulated reference signal mode figure that adopts NCP when carrying out the PUSCH transfer of data in LTE R8 system.
Fig. 2 is the demodulated reference signal mode figure that adopts ECP when carrying out the PUSCH transfer of data in LTE R8 system.
Fig. 3 is the demodulated reference signal mode figure that LTE R9/R10 system adopts NCP when carrying out the PUSCH transfer of data.
Fig. 4 saves the first schematic diagram of the required expense of uplink demodulation reference signal from time domain.
Fig. 5 saves the second schematic diagram of the required expense of uplink demodulation reference signal from time domain.
Fig. 6 saves the 3rd schematic diagram of the required expense of uplink demodulation reference signal from time domain.
Fig. 7 saves the 4th schematic diagram of the required expense of uplink demodulation reference signal from time domain.
Fig. 8 saves the first schematic diagram of the required expense of uplink demodulation reference signal from frequency domain.
Fig. 9 saves the second schematic diagram of the required expense of uplink demodulation reference signal from frequency domain.
Figure 10 saves the 3rd schematic diagram of the required expense of uplink demodulation reference signal from frequency domain.
Figure 11 saves the 4th schematic diagram of the required expense of uplink demodulation reference signal from frequency domain.
Figure 12 saves the first schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 13 saves the second schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 14 saves the 3rd schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 15 saves the 4th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 16 saves the 5th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 17 saves the 6th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 18 saves the 7th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 19 saves the 8th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Embodiment
The present invention analyzes by the application scenarios to mobile communication, according to the characteristics of application-specific scene, proposes to save the scheme of uplink demodulation reference signal expense under this application-specific scene.
The applicant finds by analysis, and the signal cover of transmitting terminal is that indoor application scenarios has following two characteristics:
Characteristics one because the user is very slow in indoor rate travel, and often be in static or half inactive state, so the variation of channel on time domain are very slow.
Characteristics two, the indoor wall penetration loss is larger, indoor is the scene of a relative closure, the reflective distance of wireless signal is very short, although the multipath effect of existence, under indoor environment, the multidiameter delay of multipath signal differs very little, and maximum multipath time delay can not surpass circulating prefix-length yet, therefore, the frequency selective fading that causes of multipath effect also a little less than.
The applicant has proposed to save the method for uplink demodulation reference signal based on the These characteristics one that analyzes and characteristics two:
Method one, based on characteristics one, the sending method to uplink demodulation reference signal on the time domain is optimized, thereby saves the expense of uplink demodulation reference signal.
Particularly, when transmitting terminal is a transport layer transmission uplink demodulation reference signal, only take a SC-FDMA symbol and send uplink demodulation reference signal on a subframe, for example, it is that a transport layer sends uplink demodulation reference signal that transmitting terminal takies on a subframe SC-FDMA symbol in time slot 0, and transmitting terminal can take also that on a subframe, a SC-FDMA symbol of time slot 1 is that a transport layer sends uplink demodulation reference signal.
Which SC-FDMA symbol that transmitting terminal specifically takies on a subframe sends uplink demodulation reference signal, and the present invention is not restricted.
In order to change as few as possible existing protocol, when adopting NCP, transmitting terminal can take the 4th SC-FDMA symbol transmission uplink demodulation reference signal in time slot 0 on a subframe, and the 4th the SC-FDMA symbol that also can take in a sub-frame slot 1 sends uplink demodulation reference signal.Similarly, when adopting ECP, transmitting terminal can take the 3rd SC-FDMA symbol transmission uplink demodulation reference signal in time slot 0 on a subframe, and the 3rd the SC-FDMA symbol that also can take in a sub-frame slot 1 sends uplink demodulation reference signal.
Method two, based on characteristics two, the sending method to uplink demodulation reference signal from the frequency domain is optimized, thereby saves the expense of uplink demodulation reference signal.
Particularly, when transmitting terminal is a transport layer transmission uplink demodulation reference signal, the part bandwidth that only takies system's full bandwidth sends uplink demodulation reference signal, for example, be the 1/2 bandwidth transmission uplink demodulation reference signal that a transport layer only takies system's full bandwidth, 1/4 bandwidth that perhaps only takies system's full bandwidth sends uplink demodulation reference signal.
Wherein, it is discontinuous that transmitting terminal is that transport layer sends between each carrier wave that uplink demodulation reference signal takies, and preferably, between adjacent carrier, the carrier number at interval is identical.
when transport layer that transmitting terminal is a receiving terminal sends between each carrier wave that uplink demodulation reference signal takies discontinuous, and when between adjacent carrier, the carrier number at interval is identical, the carrier wave at interval between described adjacent carrier, can be used to the transport layer of other receiving terminals and/or other transport layers of this receiving terminal to send uplink demodulation reference signal, also discontinuous between each carrier wave that the uplink demodulation reference signal of other transport layers of the transport layer of described other receiving terminals and/or described this receiving terminal takies, and between adjacent carrier, the carrier number at interval is also identical, in other words, for each transport layer, transmitting terminal sends between each carrier wave that uplink demodulation reference signal takies discontinuous for it, and between adjacent carrier, the carrier number at interval is identical, the carrier wave at interval between the adjacent carrier that is used for the transmission uplink demodulation reference signal that each transport layer takies, can be used to other transport layers to send uplink demodulation reference signal, thereby realize different user, and/or the orthogonal multiplex of same user's different transport layers.
Described method one and described method two can be combined with.
The below carries out exemplary illustration for concrete example to the method for method one, method two and both combinations take the situation of NCP as example, and the method that given example adopts is equally applicable to the situation of ECP.
The example of saving the required expense of uplink demodulation reference signal from time domain sees also Fig. 4～Fig. 7.
In Fig. 4～Fig. 7, all only to take a SC-FDMA symbol to send uplink demodulation reference signal on a subframe, in other words, the two row DMRS resources that transmission uplink demodulation reference signal in prior art need to be taken are kept to 1 row DMRS resource, particularly, only take 1 row SC-FDMA symbol and send the DMRS signal on time slot 0 or time slot 1, thereby reduce the SC-FDMA symbol expense of half.
Fig. 4 saves the first schematic diagram of the required expense of uplink demodulation reference signal from time domain.
In Fig. 4, transmitting terminal sends uplink demodulation reference signal on the 4th SC-FDMA symbol of the time slot 0 of a subframe.
Fig. 5 saves the second schematic diagram of the required expense of uplink demodulation reference signal from time domain.
In Fig. 5, transmitting terminal sends uplink demodulation reference signal on the 4th SC-FDMA symbol of the time slot 1 of a subframe.
Fig. 6 saves the 3rd schematic diagram of the required expense of uplink demodulation reference signal from time domain.
In Fig. 6, transmitting terminal sends uplink demodulation reference signal on the 7th SC-FDMA symbol of the time slot 0 of a subframe.
Fig. 7 saves the 4th schematic diagram of the required expense of uplink demodulation reference signal from time domain.
In Fig. 7, transmitting terminal sends uplink demodulation reference signal on the 1st SC-FDMA symbol of the time slot 1 of a subframe.
The example of saving the required expense of uplink demodulation reference signal from frequency domain sees also Fig. 8～Figure 11.
In Fig. 8～Figure 11, all only to take the part bandwidth transmission uplink demodulation reference signal of full bandwidth for a transport layer, in other words, will be that transport layer sends full bandwidth that uplink demodulation reference signal need to take and is kept to and only takies a part of bandwidth in prior art, thereby reduce the frequency band expense.
Fig. 8 saves the first schematic diagram of the required expense of uplink demodulation reference signal from frequency domain.
In Fig. 8,1/2 bandwidth that transmitting terminal takies system's full bandwidth is that a transport layer sends uplink demodulation reference signal, and particularly, transmitting terminal is to be separated with 1 subcarrier between a transport layer sends between the adjacent sub-carrier that uplink demodulation reference signal takies.
Fig. 9 saves the second schematic diagram of the required expense of uplink demodulation reference signal from frequency domain.
In Fig. 9, transmitting terminal is to be separated with 1 subcarrier between transport layer of a receiving terminal sends between the adjacent sub-carrier that uplink demodulation reference signal takies, and this subcarrier at interval is used for another transport layer and sends uplink demodulation reference signal, therefore can increase by 1 orthogonal multiplex dimension, wherein, this another transport layer can be the transport layer of another receiving terminal, can be also another transport layer of this receiving terminal.
Figure 10 saves the 3rd schematic diagram of the required expense of uplink demodulation reference signal from frequency domain.
In Figure 10, transmitting terminal is the 1/4 bandwidth transmission uplink demodulation reference signal that a transport layer of a receiving terminal takies system's full bandwidth, particularly, transmitting terminal is to be separated with 3 subcarriers between transport layer of a receiving terminal sends between the adjacent sub-carrier that uplink demodulation reference signal takies.
Figure 11 saves the 4th schematic diagram of the required expense of uplink demodulation reference signal from frequency domain.
In Figure 11, transmitting terminal is to be separated with 3 subcarriers between transport layer of a receiving terminal sends between the adjacent sub-carrier that uplink demodulation reference signal takies, and 3 subcarriers of this of interval are used for the transport layer of other receiving terminal and/or other transport layers of this receiving terminal send uplink demodulation reference signal, therefore can increase by 3 orthogonal multiplex dimensions.
Method one is combined with method two, and the example from time domain and the required expense of frequency domain saving uplink demodulation reference signal sees also Figure 12～Figure 19 simultaneously.
In Figure 12～Figure 19, transmitting terminal is all on a SC-FDMA symbol of a subframe and the part bandwidth that only takies full bandwidth is that a transport layer sends uplink demodulation reference signal, thereby reduces the frequency band expense.
Figure 12 saves the first schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
In Figure 12, transmitting terminal is a transport layer takies system's full bandwidth on the 4th SC-FDMA symbol of a sub-frame slot 0 1/2 bandwidth transmission uplink demodulation reference signal, particularly, transmitting terminal is to be separated with 1 subcarrier between transport layer sends between the adjacent sub-carrier that uplink demodulation reference signal takies.
Figure 13 saves the second schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
In Figure 13, transmitting terminal is that transport layer of a receiving terminal sends uplink demodulation reference signal on the 4th SC-FDMA symbol of a sub-frame slot 0, and be separated with 1 subcarrier between between the adjacent sub-carrier that sends uplink demodulation reference signal, and this subcarrier at interval is used to the transport layer of another receiving terminal or another transport layer of this receiving terminal to send uplink demodulation reference signal, therefore can increase by 1 orthogonal multiplex dimension.
Figure 14 saves the 3rd schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
In Figure 14, transmitting terminal on the 7th SC-FDMA symbol of a sub-frame slot 0,1/2 bandwidth that takies system's full bandwidth is that a transport layer sends uplink demodulation reference signal, particularly, transmitting terminal is used to transport layer to be separated with 1 subcarrier between sending between the adjacent sub-carrier that uplink demodulation reference signal takies.
Figure 15 saves the 4th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 15 on the basis of Figure 14, is the subcarrier that a transport layer sends interval between the adjacent carrier of uplink demodulation reference signal with transmitting terminal, is used to another transport layer to send uplink demodulation reference signal.
Figure 16 saves the 5th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 17 saves the 6th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
The difference of the difference of Figure 16 and Figure 12 and Figure 17 and Figure 13 all is, transmitting terminal sends uplink demodulation reference signal on the 4th SC-FDMA symbol of a sub-frame slot 1.
Figure 18 saves the 7th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
Figure 19 saves the 8th schematic diagram of the required expense of uplink demodulation reference signal from time domain and frequency domain.
The difference of the difference of Figure 18 and Figure 12 and Figure 19 and Figure 13 all is, transmitting terminal sends uplink demodulation reference signal on the 1st SC-FDMA symbol of a sub-frame slot 1.
The present invention also provides a kind of transmitting apparatus of uplink demodulation reference signal, and it is that in indoor application scenarios, this equipment comprises sending module that this equipment is applied in signal cover.
Described sending module, only take a SC-FDMA symbol for a transport layer that is a receiving terminal on a subframe and send uplink demodulation reference signal, and/or, be that the part bandwidth that a transport layer of a receiving terminal only takies system's full bandwidth sends uplink demodulation reference signal.
Described sending module, be used to transport layer of a receiving terminal to send between each carrier wave that uplink demodulation reference signal takies discontinuous, and the carrier number that sends interval between the adjacent carrier of uplink demodulation reference signal for each transport layer is identical, wherein, described each transport layer comprises the transport layer of different receiving terminals and/or the different transport layers of a receiving terminal.
Described sending module, between the adjacent carrier that will take for a transport layer transmission uplink demodulation reference signal of a receiving terminal, the carrier wave at interval, be used to the transport layer of other receiving terminals and/or other transport layers of this receiving terminal to send uplink demodulation reference signals.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. the sending method of a uplink demodulation reference signal, is characterized in that, the method comprises:
When the signal cover of transmitting terminal is indoor application scenarios, this transmitting terminal is that a transport layer of a receiving terminal only takies a single-carrier frequency division multiple access SC-FDMA symbol transmission uplink demodulation reference signal on a subframe, and/or transmitting terminal is the part bandwidth transmission uplink demodulation reference signal that a transport layer of a receiving terminal only takies system's full bandwidth.
2. method according to claim 1, is characterized in that, described transmitting terminal is that part bandwidth that a transport layer of a receiving terminal only takies system's full bandwidth sends uplink demodulation reference signal and comprises:
It is discontinuous that transmitting terminal is that transport layer of a receiving terminal sends between each carrier wave that uplink demodulation reference signal takies.
3. method according to claim 2, it is characterized in that, transmitting terminal is identical for the carrier number at interval between the adjacent carrier of each transport layer transmission uplink demodulation reference signal, and wherein, described each transport layer comprises the transport layer of different receiving terminals and/or the different transport layers of a receiving terminal.
4. method according to claim 3, is characterized in that, the method also comprises:
Transmitting terminal is the carrier wave that transport layer of a receiving terminal sends interval between the adjacent carrier that uplink demodulation reference signal takies, and is used to the transport layer of other receiving terminals or other transport layers of this receiving terminal to send uplink demodulation reference signals.
5. method according to claim 1, is characterized in that, transmitting terminal is 1/2 bandwidth or the 1/4 bandwidth transmission uplink demodulation reference signal that a transport layer of a receiving terminal only takies system's full bandwidth.
6. method according to claim 5, is characterized in that,
When 1/2 bandwidth that only takies system's full bandwidth in the transmitting terminal transport layer that is a receiving terminal sends uplink demodulation reference signal, transmitting terminal is to be separated with 1 subcarrier between transport layer of a receiving terminal sends between the adjacent sub-carrier of uplink demodulation reference signal, and this subcarrier at interval is used to the transport layer of another receiving terminal or another transport layer of this receiving terminal to send uplink demodulation reference signal;
When 1/4 bandwidth that only takies system's full bandwidth in the transmitting terminal transport layer that is a receiving terminal sends uplink demodulation reference signal, transmitting terminal is to be separated with 3 subcarriers between transport layer of a receiving terminal sends between the adjacent sub-carrier of uplink demodulation reference signal, and these 3 subcarriers at interval are used to the transport layer of other different receiving terminals and/or the different transport layers of this receiving terminal to send uplink demodulation reference signals.
7. the described method of arbitrary claim of according to claim 1 to 6, is characterized in that, transmitting terminal is that a transport layer of a receiving terminal only takies SC-FDMA symbol and sends uplink demodulation reference signal and comprise on a subframe:
Transmitting terminal is that a transport layer of a receiving terminal sends uplink demodulation reference signal on the 4th of a sub-frame slot 0 or the 7th SC-FDMA symbol or on the 4th of a sub-frame slot 1 or the 1st SC-FDMA symbol.
8. the transmitting apparatus of a uplink demodulation reference signal, is characterized in that, it is that in indoor application scenarios, this equipment comprises sending module that this equipment is applied in signal cover;
Described sending module, only take a SC-FDMA symbol for a transport layer that is a receiving terminal on a subframe and send uplink demodulation reference signal, and/or, be that the part bandwidth that a transport layer of a receiving terminal only takies system's full bandwidth sends uplink demodulation reference signal.
9. transmitting apparatus according to claim 8, is characterized in that,
Described sending module, be used to transport layer of a receiving terminal to send between each carrier wave that uplink demodulation reference signal takies discontinuous, and the carrier number that sends interval between the adjacent carrier of uplink demodulation reference signal for each transport layer is identical, wherein, described each transport layer comprises the transport layer of different receiving terminals and/or the different transport layers of a receiving terminal.
10. transmitting apparatus according to claim 9, is characterized in that,
Described sending module, between the adjacent carrier that will take for a transport layer transmission uplink demodulation reference signal of a receiving terminal, the carrier wave at interval, be used to the transport layer of other receiving terminals and/or other transport layers of this receiving terminal to send uplink demodulation reference signals.
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