CN101373999A - Pilot transmission method for down collaboration multi-point transmission - Google Patents
Pilot transmission method for down collaboration multi-point transmission Download PDFInfo
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- CN101373999A CN101373999A CNA2008102106984A CN200810210698A CN101373999A CN 101373999 A CN101373999 A CN 101373999A CN A2008102106984 A CNA2008102106984 A CN A2008102106984A CN 200810210698 A CN200810210698 A CN 200810210698A CN 101373999 A CN101373999 A CN 101373999A
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Abstract
The invention discloses a pilot frequency transmission method for downlink shared multicast transmission, which is used in a long term evolution advance (LTE-A) system. The system is allocated with a plurality of sets of pilot frequencies for downlink multicast transmission and multiplexing modes thereof; and each transmission point involved in downlink share transmits one of the pilot frequencies in a resource block carrying user data, the same set of pilot frequency occupies the same time and frequency sites in the resource block, and the different sets of pilot frequencies are discriminated via frequency division, time division or code division in the resource block. The inventive method needs not a receiving terminal to discriminate channels corresponding to the transmission points which are involved in the share and only needs to allocate one set or a plurality of sets of logic pilot frequencies for multicast transmission, thereby resulting in low cost of pilot frequencies, simple terminal reception and less downlink control signaling.
Description
Technical field
The present invention relates to system of broadband wireless communication, relate to the pilot frequency transmission method that 3GPP LTE-A system (the follow-up evolution system of LongTerm Evolution Advance Long Term Evolution) is used for cooperative multipoint transmission particularly.
Background technology
Proposition along with the LTE-A demand, people more and more pay attention to sub-district average spectral efficiency (ase) and cell edge spectrum efficiency, comparatively speaking, the spectrum efficiency of cell edge is paid close attention to by people most, and this mainly is because the provisional capital up and down of LTE-A system is to be the frequency division systems of basic multiple access multiplexing mode with OFDM (perhaps with certain distortion of the OFDM).With traditional be that the wireless communication system of basic multiple access multiplexing mode is different with CDMA, the LTE-A system does not have processing gain, the inner because frequency division quadrature fully in sub-district so almost there is not interference problem, but is handled thorny relatively in the interference at cell edge place.
Cooperative multipoint transmission is just in order to solve a kind of effective means of cell edge interference problem.It not only by coordinating mutually between the base station, makes that the shared resource of Cell Edge User is mutually orthogonal, also utilizes the unification of a plurality of sub-districts to transmit its signal for the targeted customer simultaneously, thereby utilize space resources, realize both having eliminated interference, strengthen the double effects of link performance and capacity again, see shown in Figure 1.
In modern wireless communication systems, generally all need to use pilot tone to come data are carried out coherent demodulation, the pilot tone that defines in the LTE system at present generally all is based on the sub-district (among the LTE except the pilot tone of antenna port 4 correspondences, it is corresponding to the MBSFN transfer of data), so these pilot tones generally are not suitable for the scene of cooperative multipoint transmission.Pilot design when optimizing cooperative multipoint transmission is necessary for a kind of pilot tone that is applicable to cooperative multipoint transmission of LTE-A system redesign.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of pilot frequency transmission method that is used for the down collaboration multicast communication, the corresponding channel of each transmission point that this method can make terminal not need to distinguish to participate in cooperation, the logic pilot tone that only needs configuration one cover or many covers to be used for multicast communication gets final product.
In order to address the above problem, the invention provides a kind of pilot frequency transmission method that is used for the down collaboration multicast communication, be applied to the follow-up evolution LTE-A system of Long Term Evolution, the many covers of described system configuration are used for the pilot tone and the multiplex modes thereof of descending multicast communication; Participate in each transmission point transmission cover pilot tone wherein in the Resource Block of carrying user data of down collaboration, same set of pilot tone takies identical time and frequency location in described Resource Block, different cover pilot tones are distinguished by frequency division, time-division or sign indicating number branch in described Resource Block.
Further, many covers pilot tone that regulation disposed in agreement in advance and the corresponding time-frequency position that takies thereof and overlap multiplex mode between pilot tone more, described each transmission point is chosen a cover and is used from many covers pilot tone of configuration, and by the many cover pilot frequency mode notice receiving terminal of signaling with use this moment, described receiving terminal carries out corresponding Data Receiving processing according to pilot frequency mode and the regulation in the agreement that the described signaling of parsing obtains; Perhaps described each transmission point uses the cover in described many cover pilot tones, and will overlap pilot frequency mode more, overlap the multiplex mode between pilot tone, the many covers pilot tone that is disposed and corresponding time-frequency position thereof all by the signaling receiving terminal more, described receiving terminal carries out corresponding Data Receiving and handles according to resolving information that described signaling obtains.
Further, described same set of pilot tone is meant in the time identical on the same resource block and launches identical pilot signal or be meant the pilot signal that is transmitted in time cocycle displacement on identical Resource Block with frequency location; When the transmission point that uses same set of pilot tone and participate in down collaboration identical time on same resource block during the pilot frequency sequence identical with the frequency location emission, the identical data of described transmission point transmission; When described transmission point was transmitted in the pilot signal of time cocycle displacement on same resource block, described transmission point also carried out identical in time cyclic shift when sending data.
Further, described receiving terminal will use same set of pilot tone and participate in data that each transmission point of cooperation sends and be used as the data of being sent by a transmit antennas and handle.
Further, a radio frequency unit in described corresponding sub-district of transmission point or the sub-district; A plurality of radio frequency units of corresponding a plurality of sub-district or same sub-district are put in a plurality of transmission, perhaps belong to the combination of above two kinds of situations.
In order to address the above problem, the present invention also provides a kind of pilot frequency transmission method that is used for the down collaboration multicast communication, is applied to the follow-up evolution LTE-A system of Long Term Evolution, the pre-configured cover pilot tone of system; Each the transmission point that participates in down collaboration sends described pilot tone in the Resource Block of carrying user data, same set of pilot tone takies identical time and frequency location in described Resource Block.
Further, in agreement, stipulate the pilot tone that disposed and shared time-frequency position thereof in advance, described each transmission point uses described pilot tone, and single cover pilot frequency mode notice receiving terminal that will use this moment by signaling, described receiving terminal carries out corresponding Data Receiving and handles according to resolving pilot frequency mode that described signaling obtains and the regulation in the agreement; Perhaps described transmission is named a person for a particular job described single time-frequency position of overlapping pilot frequency mode, the pilot tone that is disposed and taking all by the signaling receiving terminal, and the information that described receiving terminal obtains according to the described signaling of parsing is carried out corresponding Data Receiving and handled.
Further, described same set of pilot tone is meant in the time identical on the same resource block and launches identical pilot signal or be meant the pilot signal that cocycle launch time is shifted on identical Resource Block with frequency location; When the transmission point that uses same set of pilot tone and participate in down collaboration identical time on same resource block during the pilot frequency sequence identical with the frequency location emission, the identical data of described transmission point transmission; When described transmission point was transmitted in the pilot signal of time cocycle displacement on same resource block, described transmission point also carried out same loop displacement in time when sending data.
Further, described receiving terminal will use same set of pilot tone and participate in data that each transmission point of cooperation sends and be used as the data of being sent by a transmit antennas and handle.
Further, a radio frequency unit in described corresponding sub-district of transmission point or the sub-district; A plurality of radio frequency units of corresponding a plurality of sub-district or same sub-district are put in a plurality of transmission, perhaps belong to the combination of above two kinds of situations.
Compared with prior art, the present invention does not need receiving terminal distinguish to participate in the corresponding channel of each transmission point of cooperation, and the logic pilot tone that only needs configuration one cover or many covers to be used for multicast communication gets final product, so pilot-frequency expense is little, terminal receives simple, and descending control signaling is also fewer.
Description of drawings
Fig. 1 is in the schematic diagram of cell edge for terminal;
Fig. 2 transmits the schematic diagram that a little uses a cover pilot tone more in the embodiment of the invention, wherein, D1～D72 is data, and P1～P6 is a pilot tone;
Fig. 3 transmits the schematic diagram that a little uses many cover pilot tones more in the embodiment of the invention; Wherein, D1～D72 is data, and d1～d72 bit data, P1～P6 are pilot tone, and R1～R6 is a pilot tone, and blank lattice are represented zero setting.
Embodiment
The present invention is in order to solve the drawback that conventional solution exists, further set forth a kind of pilot frequency transmission method that is used for the down collaboration multicast communication of the present invention by following specific embodiment, below embodiment is described in detail, but not as a limitation of the invention.
Core thinking of the present invention is: each transmission point sends one or more sets pilot tones on the shared identical time of user data, each the transmission point that uses same set of pilot tone and participation to cooperate was launched identical pilot signal or launch the pilot signal of (cyclic shifting) in time on identical Resource Block with frequency location in the time identical on the described Resource Block, for many covers pilot tone, described respectively overlapping between the pilot tone by frequency division, time-division or the described Resource Block of code division multiplexing.
Below be described to launch identical pilot frequency sequence.
As shown in Figure 2, for transmitting the schematic diagram that a little uses a cover pilot tone in the embodiment of the invention more.
System goes up configuration one cover pilot tone at the shared time RB of user data (Resource Block), and (P1～P6), this cover pilot tone is all used in three sub-districts.Receiving-transmitting sides can provide the pilot tone that is disposed in advance and take in agreement information such as time-frequency position, single cover pilot frequency mode notice receiving terminal that launch point will use by signaling this moment, receiving terminal are according to the regulation in agreement in advance and resolve described signaling and obtain current pilot frequency mode and carry out corresponding Data Receiving and handle.
The transverse axis of RB is the time among Fig. 2, and the longitudinal axis is a frequency, can see in the present embodiment, and three sub-districts are used this cover pilot tone and participated in cooperation, go up the identical pilot frequency sequence of emission in the identical time with identical frequency (being identical subcarrier).A radio frequency unit that transmits in corresponding sub-district (base station) of point or the sub-district, a plurality of transmission are put a plurality of radio frequency units of corresponding a plurality of sub-district (base station) or same sub-district or are belonged to the combination of above two kinds of situations.Each the transmission point that uses these pilot tones and participate in cooperating identical time on time RB sends identical data with frequency location.These pilot tones are launched on antenna port (Antenna Port) 6 with user data.
Notice that system does not dispose pilot tone on the shared Resource Block of non-user.Time is the Resource Block in LTE system and the LTE-A system.This programme also can be with this single cover pilot frequency mode and the pilot tone that is disposed and the information such as time-frequency position that take thereof all by the signaling receiving terminal, and receiving terminal carries out corresponding Data Receiving processing according to resolving the information that described signaling obtains.
In another embodiment, use each transmission point of same set of pilot tone and participation cooperation on described same resource block, to be transmitted in the pilot signal that the time cocycle is shifted.When sending data, also to carry out cyclic shift in the same manner with the cyclic shift of pilot signal.
As shown in Figure 3, for transmitting the schematic diagram that a little uses many cover pilot tones in the embodiment of the invention more.
Receiving-transmitting sides can provide many covers pilot tone and the corresponding time-frequency position that takies thereof that is disposed in advance and overlap information such as multiplex mode between pilot tone more in agreement, many covers pilot frequency mode notice receiving terminal that transmission point will use by signaling this moment, receiving terminal are according to the regulation in agreement in advance and resolve pilot frequency mode that described signaling obtains and carry out corresponding Data Receiving and handle.At this moment, receiving terminal does not need to know that the transmission point uses is for which cover pilot tone, as long as according to current pilot frequency mode, the information that obtains corresponding regulation in agreement just can carry out Data Receiving.
Two cover pilot tones (P1～P6 and R1～R6) and corresponding multiplex modes according to system configuration, each sub-district of participation multicast communication is chosen a corresponding cover pilot tone respectively and is sent on the shared identical time RB of user data, can pass through frequency division, time-division or sign indicating number between the two cover pilot tones and divide differentiation, two cover pilot tones are used the frequency division mode in this example.
Obviously, use the sub-district 1 of same set of pilot tone upward to launch identical pilot frequency sequence in the identical time with identical frequency (being identical subcarrier) with each transmission point of sub-district 3 interior participation cooperations, a cover pilot tone wherein can only be used in each sub-district, can not use two covers or the above pilot tone of two covers.The corresponding sub-district (base station) of transmission point, different radio frequency unit that also can corresponding same sub-district perhaps belongs to the combination of above two kinds of situations.
The part of zero setting represents not have data to send among Fig. 3, sub-district 1 sends identical data (D represents with capitalization) with 3 interior each transmission time identical on time RB that participate in cooperation of sub-district with frequency location, and what sub-district 2 sent is different data (d represents with small letter).
The data that the transmission point that receiving terminal will use same set of pilot tone and participate in cooperating sends are used as the data of being sent by a transmit antennas and are handled: only dispose a cover pilot tone if participate in each transmission point of down collaboration multicast communication on antenna port 6 (Antenna Port 6), then receiving terminal is regarded a transmit antennas as and is handled, if configuration N cover pilot tone, then receiving terminal is regarded the N transmit antennas as, and the defeated mode of various multi-antenna transmitting also is (can think the corresponding transmit antennas of every cover pilot tone) that is configured on this N cover pilot tone.
This programme also can be with these many cover pilot frequency mode, the many covers pilot tone that is disposed and corresponding time-frequency positions that take thereof and the information such as multiplex mode between pilot tone of overlapping all by the signaling receiving terminal more, and receiving terminal carries out corresponding Data Receiving processing according to resolving the information that described signaling obtains.
Therefore, receiving terminal only needs according to the pilot tone of receiving all transmission points that use this cover pilot tone to be made a channel estimating, all transmission points are used as through an overall channel launch, just can carry out Data Receiving then, do not need to distinguish the corresponding channel of each transmission point that participates in cooperation, terminal receives simple, and descending control signaling is also fewer.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. pilot frequency transmission method that is used for the down collaboration multicast communication is applied to the follow-up evolution LTE-A system of Long Term Evolution, it is characterized in that,
The many covers of described system configuration are used for the pilot tone and the multiplex mode thereof of descending multicast communication;
Participate in each transmission point transmission cover pilot tone wherein in the Resource Block of carrying user data of down collaboration, same set of pilot tone takies identical time and frequency location in described Resource Block, different cover pilot tones are distinguished by frequency division, time-division or sign indicating number branch in described Resource Block.
2. the method for claim 1 is characterized in that,
Many covers pilot tone that regulation disposed in agreement in advance and the corresponding time-frequency position that takies thereof and overlap multiplex mode between pilot tone more, described each transmission point is chosen a cover and is used from many covers pilot tone of configuration, and by the many cover pilot frequency mode notice receiving terminal of signaling with use this moment, described receiving terminal carries out corresponding Data Receiving processing according to pilot frequency mode and the regulation in the agreement that the described signaling of parsing obtains;
Perhaps described each transmission point uses the cover in described many cover pilot tones, and will overlap pilot frequency mode more, overlap the multiplex mode between pilot tone, the many covers pilot tone that is disposed and corresponding time-frequency position thereof all by the signaling receiving terminal more, described receiving terminal carries out corresponding Data Receiving and handles according to resolving information that described signaling obtains.
3. the method for claim 1 is characterized in that,
Described same set of pilot tone was meant in the time identical on the same resource block launches identical pilot signal or is meant the pilot signal that is transmitted in time cocycle displacement on identical Resource Block with frequency location;
When the transmission point that uses same set of pilot tone and participate in down collaboration identical time on same resource block during the pilot frequency sequence identical with the frequency location emission, the identical data of described transmission point transmission; When described transmission point was transmitted in the pilot signal of time cocycle displacement on same resource block, described transmission point also carried out identical in time cyclic shift when sending data.
4. method as claimed in claim 2 is characterized in that,
The data that described receiving terminal will use each transmission point of same set of pilot tone and participation cooperation to send are used as the data of being sent by a transmit antennas and are handled.
5. the method for claim 1 is characterized in that,
A radio frequency unit in described corresponding sub-district of transmission point or the sub-district;
A plurality of radio frequency units of corresponding a plurality of sub-district or same sub-district are put in a plurality of transmission, perhaps belong to the combination of above two kinds of situations.
6. pilot frequency transmission method that is used for the down collaboration multicast communication is applied to the follow-up evolution LTE-A system of Long Term Evolution, it is characterized in that,
The pre-configured cover pilot tone of system;
Each the transmission point that participates in down collaboration sends described pilot tone in the Resource Block of carrying user data, same set of pilot tone takies identical time and frequency location in described Resource Block.
7. method as claimed in claim 6 is characterized in that,
In agreement, stipulate the pilot tone that disposed and shared time-frequency position thereof in advance, described each transmission point uses described pilot tone, and single cover pilot frequency mode notice receiving terminal that will use this moment by signaling, described receiving terminal carries out corresponding Data Receiving and handles according to resolving pilot frequency mode that described signaling obtains and the regulation in the agreement;
Perhaps described transmission is named a person for a particular job described single time-frequency position of overlapping pilot frequency mode, the pilot tone that is disposed and taking all by the signaling receiving terminal, and the information that described receiving terminal obtains according to the described signaling of parsing is carried out corresponding Data Receiving and handled.
8. method as claimed in claim 6 is characterized in that,
Described same set of pilot tone was meant in the time identical on the same resource block launches identical pilot signal or is meant the pilot signal that cocycle launch time is shifted on identical Resource Block with frequency location;
When the transmission point that uses same set of pilot tone and participate in down collaboration identical time on same resource block during the pilot frequency sequence identical with the frequency location emission, the identical data of described transmission point transmission; When described transmission point was transmitted in the pilot signal of time cocycle displacement on same resource block, described transmission point also carried out same loop displacement in time when sending data.
9. method as claimed in claim 7 is characterized in that,
The data that described receiving terminal will use each transmission point of same set of pilot tone and participation cooperation to send are used as the data of being sent by a transmit antennas and are handled.
10. method as claimed in claim 6 is characterized in that,
A radio frequency unit in described corresponding sub-district of transmission point or the sub-district;
A plurality of radio frequency units of corresponding a plurality of sub-district or same sub-district are put in a plurality of transmission, perhaps belong to the combination of above two kinds of situations.
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