CN101778065A - Method and system for mapping downlink data carriers - Google Patents
Method and system for mapping downlink data carriers Download PDFInfo
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- CN101778065A CN101778065A CN200910076632A CN200910076632A CN101778065A CN 101778065 A CN101778065 A CN 101778065A CN 200910076632 A CN200910076632 A CN 200910076632A CN 200910076632 A CN200910076632 A CN 200910076632A CN 101778065 A CN101778065 A CN 101778065A
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Abstract
The invention discloses a method for mapping downlink data carriers. The method comprises the following steps: judging whether the number of antenna ports is larger than the maximum number of antenna ports supported by the downlink transmission of a lower-version long-term evolution (LTE) system; and if so, mapping the data carriers to lower-version LTE system terminals and LTE-A (advanced long-term evolution) system terminals by using different mapping methods respectively. The invention further discloses a system for mapping downlink data carriers, wherein a judging unit is used for judging whether the number of antenna ports is larger than the maximum number of antenna ports supported by the downlink transmission of the lower-version LTE system and informing a data carrier mapping unit of the judging result, so that the treatment can be respectively carried out according to the judging result. By using the method and system, the LET-A system is backward-compatible with the lower-version LTE system terminals when mapping the downlink data carriers in the high-order antenna configuration mode.
Description
Technical field
The present invention relates to the technology of mapping downlink data carriers, relate in particular to the method and system of the mapping downlink data carriers of a kind of compatible lowest version LTE system.
Background technology
Lowest version LTE system is such as Long Term Evolution R8 (LTE R8, Long Term Evolution Release8) in the system, because the down link transmitting antenna port number of high support is 4, antenna port comprises antenna port 0, antenna port 1, antenna port 2 and antenna port 3; The antenna configurations pattern of supporting is the scene of one, two or four antenna port, the antenna configurations pattern comprise 0}, 0,1} or 0,1,2,3}.Therefore, provided the public guide frequency mapping method of maximum 4 antenna ports in LTE R8, the effect of this class pilot tone comprises: the detection of signal and the measurement of channel quality etc.
Adopt prior art, the pilot tone of 4 antenna port correspondences is by frequency division multiplexing (FDM at the full range band, Frequency Division Multiplexing) mode and data multiplex, and for fear of the pilot frequency locations conflict of neighbor cell, in different districts, utilize cell ID to produce the side-play amount of frequency domain, thereby make the pilot frequency locations of neighbor cell keep quadrature as far as possible.The method of pilot tone mapping is specially: pilot frequency sequence
To be mapped to complex modulation symbols
As antenna port p at n
sThe reference symbol of time slot, the computing formula that is adopted is
Wherein, k=6m+ (v+v
Shift) mod 6;
Here, k represents the frequency domain index, Domain Index when l represents, the then two-dimensional array that is made of k and l (k, l) position of expression Resource Unit (RE, Resource Element) in resource mapping schematic diagram;
The number of the frequency domain resource piece (RB, Resource Block) of expression downlink bandwidth correspondence;
The number of the frequency domain RB of maximum bandwidth correspondence in the expression expression down link;
The OFDM number of symbols of descending each time slot of expression; Variable v and v
ShiftRepresent the position of different pilot tones at frequency domain, wherein, v is expressed as
The specific frequency shift (FS) in sub-district is expressed as
Wherein x mod y represents with x the y delivery.
Fig. 1～Fig. 7 is respectively and adopts in the prior art LTE R8 system, the resource mapping schematic diagram of the descending pilot frequency mapping of arbitrary antenna port under short Cyclic Prefix (CP, Cyclic Prefix) situation in the different antennae configuration mode.And the antenna configurations pattern be 0,1}, 0,1} or 0,1,2,3}.The two-dimensional array that constitutes by k and l (k, the l) position of expression RE in resource mapping schematic diagram, wherein, R
pThe shared RE of pilot tone of expression transmit antenna port p, p=0,1,2,3; R
0Fill R with left oblique line
1Fill R with right oblique line
2Fill R with vertical line
3Fill with horizontal line; The position of filling with cross spider shows that pilot tone is a quadrature, as Fig. 2 and Fig. 3 jointly corresponding to 2 antenna ports be the antenna configurations pattern for 0, the scene of 1}, the RE quadrature that RE that antenna port 0 takies and antenna port 1 take; And unfilled blank position is the shared RE of mapped data when being used for mapping downlink data carriers.As seen, carry out data carrier when mapping in LTE R8 system, the shared RE of mapped data is: distribute the shared RE of pilot tone not mapped among the RB, promptly the shared RE of the shared RE of mapped data and the pilot tone of mapping does not conflict among the RB.
Continuation evolution development along with the LTE system, senior Long Term Evolution (the LTE-A of enhancement mode, Long TermEvolution Advance) system arises at the historic moment, in the LTE-A system, spectrum efficiency for further raising system, down link occurred and supported the demand of 8 antenna ports at most, and occurred in the LTE-A system thereupon greater than the mapping downlink data carriers under the antenna configurations pattern of 4 antenna ports.Here, the antenna configurations pattern greater than 4 antenna ports is the high-order antenna configuration mode.Yet, the present LTE R8 system down link transmitting antenna port number of high support is 4, so under LTE R8 system and LTE-A system and the situation of depositing, need to solve the compatibling problem of LTE R8 system and LTE-A system, be: when mapping downlink data carriers, make the terminal of the terminal energy backward compatibility LTE R8 system of LTE-A system.
In the LTE-A system, because the terminal of the terminal of LTE-A system and LTE R8 system needs can be compatible.Therefore, on the one hand, relate to flase drop and survey.Specifically, under 8 antenna port situations, influencing each other when 4 antenna ports need considering to increase newly and the terminal of LTER8 system are carried out mapping downlink data carriers, otherwise can influence of the separate mapping of the terminal of LTE R8 system to carrier wave.That is to say, the highest support 4 antenna ports of LTER8 system down link, pilot tone for 4 antenna port correspondences that increase newly can't correctly be discerned, the pilot tone flase drop that 4 antenna port correspondences that will increase newly then can occur is surveyed and be the problem of data, and the while data can cause interference to the pilot tone of 4 antenna ports increasing newly.On the other hand, relate to the channel strategy.Specifically, for the user of LTE-A system, 4 antenna ports that increase newly are the spectrum efficiencies for further raising system, and in order to give full play to the effect of 8 antenna ports, need obtain channel information accurately as far as possible, if the pilot tone of the 4 antenna port correspondences that restriction increases newly then can influence the channel strategy of 4 antenna ports that increase newly in the insertion position of frequency domain density.At the channel strategy specifically, be meant if can't obtain channel information accurately, and then can't obtain the order information of the good channel of channel quality of each spatial sub-channel accurately, thus can't select only antenna configurations pattern according to channel conditions, influence the detection of data simultaneously.Therefore, in the LTE-A system, the pilot tone mapping to 4 antenna port correspondences increasing newly when the high-order antenna configuration mode carries out mapping downlink data carriers, need take into full account the compatibility issue to the terminal of LTE R8 system.At present, for this compatibility issue, still there is not effective solution.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and system of mapping downlink data carriers, taken all factors into consideration to the compatible of lowest version LTE system terminal with to the channel information of LTE-A terminal and obtained two aspect situations, make the LTE-A system under the high-order antenna configuration mode, the terminal of energy backward compatibility lowest version LTE system when realizing mapping downlink data carriers.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of mapping downlink data carriers, this method comprises: judge whether the antenna port number transmits the maximum antenna port number of being supported greater than lowest version Long Term Evolution LTE system descending, if, then, adopt different mapping modes to realize the data carrier mapping respectively to the terminal of the terminal of described lowest version LTE system and senior Long Term Evolution LTE-A system; Otherwise the terminal to the terminal of described lowest version LTE system and described LTE-A system all adopts identical mapping mode to realize the data carrier mapping.
Wherein, under the maximum antenna port number situation that the antenna port number is supported greater than lowest version LTE system descending transmission, the mapping mode that the terminal of lowest version LTE system is adopted is specially: the mapping mode of the maximum antenna configuration mode correspondence that transmission is supported according to lowest version LTE system descending carries out the data carrier mapping.
Wherein, at the shared Resource Unit RE of mapped data, increase newly under the shared RE conflict situations of the pilot tone of the corresponding mapping of antenna port with relative lowest version LTE system, the described mapping mode that the terminal of lowest version LTE system is adopted further is: the mapped data and the pilot tone of the mapping of current RE correspondence of current RE correspondence are chosen normalized different weight w
1And w
2Stack emission after the weighting; Wherein, w
1For more than or equal to 0 weights, w
2For greater than 0 weights.
Wherein, the described mapping mode that the terminal of lowest version LTE system is adopted is specially: choose w
1=0, w
2=1.
Wherein, at the shared RE of mapped data, under the shared RE conflict situations of the pilot tone of the mapping that already present antenna port is corresponding in the lowest version LTE system, the mapping mode that described terminal to lowest version LTE system adopts further is: the mapped data of current RE correspondence is mapped to: on the shared RE of next adjacent not mapped pilot tone.
Wherein, under the maximum antenna port number situation that the antenna port number is supported greater than lowest version LTE system descending transmission, the mapping mode that the terminal of LTE-A system is adopted is specially: mapped data is mapped on the shared RE of not mapped pilot tone;
Under the maximum antenna port number situation that the antenna port number is supported smaller or equal to lowest version LTE system descending transmission, the same map mode that the terminal of the terminal of lowest version LTE system and LTE-A system is all adopted is specially: mapped data is mapped on the shared RE of not mapped pilot tone.
Wherein, this method also comprises: the described mapping mode that will realize the data carrier mapping is applied to dissimilar channels; Described channel comprises: control channel, shared channel, broadcast channel, control indicating channel and mix automatic request retransmission indicating channel.
A kind of system of mapping downlink data carriers, this system comprises: judging unit and data carrier mapping realize the unit; Wherein,
Judging unit is used to judge whether the antenna port number transmits the maximum antenna port number of being supported greater than lowest version LTE system descending, and notifies described data carrier mapping to realize the unit judged result;
Data carrier mapping realizes the unit, and being used to receive content is the judged result that is, and to the terminal of described lowest version LTE system and the terminal of LTE-A system, adopts different mapping modes to realize the data carrier mapping respectively; Perhaps, be used to receive content and be judged result not, and, all adopt identical mapping mode to realize the data carrier mapping the terminal of the terminal of described lowest version LTE system and described LTE-A system.
Wherein, described data carrier mapping realizes the unit, be further used at the shared RE of mapped data, increase newly under the shared RE conflict situations of the pilot tone of the corresponding mapping of antenna port with relative lowest version LTE system, the terminal of lowest version LTE system is adopted: the mapped data and the pilot tone of the mapping of current RE correspondence of current RE correspondence are chosen normalized different weight w
1And w
2The mapping mode of stack emission after the weighting; Wherein, w
1For more than or equal to 0 weights, w
2For greater than 0 weights.
Wherein, described data carrier mapping realizes the unit, is further used for adopting: choose w
1=0, w
2=1 mapping mode.
Method of the present invention is under the maximum antenna port number situation that the antenna port number is supported greater than the transmission of lowest version LTE system descending, to the terminal of lowest version LTE system and the terminal of LTE-A system, adopt different mapping modes to realize the data carrier mapping respectively; Under the maximum antenna port number situation that the antenna port number is supported smaller or equal to the transmission of lowest version LTE system descending,, all adopt identical mapping mode to realize the data carrier mapping to the terminal of lowest version LTE system and the terminal of LTE-A system.
The present invention takes all factors into consideration two aspect situations of flase drop survey and precision of channel estimation, when the maximum antenna port number that adopts the relative lowest version LTE system descending transmission of LTE-A system to support increases to some extent, just under the maximum antenna port number situation that the antenna port number is supported greater than the transmission of lowest version LTE system descending, adopt the present invention, to adopt different mapping modes to realize the data carrier mapping respectively to the terminal of lowest version LTE system and the terminal of LTE-A system.Here, lowest version LTE system can be LTE R8 system, thereby under LTE R8 system and LTE-A system and the situation of depositing, solve the compatibling problem of LTE R8 system and LTE-A system, be: when mapping downlink data carriers, make the terminal of the terminal energy backward compatibility LTE R8 system of LTE-A system.That is to say, solved in the LTE-A system, introduce the high-order antenna configuration mode after, to the influence of the terminal of compatible LTE R8 system, the terminal that makes the terminal of LTE R8 system and LTE-A system can be compatible when realizing mapping downlink data carriers.
Description of drawings
Fig. 1 is { pilot resources mapping schematic diagram during 0} for existing antenna configurations pattern;
Fig. 2 is that { 0, the pilot tone of antenna port 0 is shone upon schematic diagram during 1} for existing antenna configurations pattern;
Fig. 3 is that { 0, the pilot tone of antenna port 1 is shone upon schematic diagram during 1} for existing antenna configurations pattern.
Fig. 4 is that { 0,1,2, the pilot tone of antenna port 0 is shone upon schematic diagram during 3} for existing antenna configurations pattern;
Fig. 5 is that { 0,1,2, the pilot tone of antenna port 1 is shone upon schematic diagram during 3} for existing antenna configurations pattern;
Fig. 6 is that { 0,1,2, the pilot tone of antenna port 2 is shone upon schematic diagram during 3} for existing antenna configurations pattern;
Fig. 7 is that { 0,1,2, the pilot tone of antenna port 3 is shone upon schematic diagram during 3} for existing antenna configurations pattern;
Fig. 8 is the realization flow schematic diagram of the inventive method;
Fig. 9 is that the terminal of lowest version LTE system is at next data map schematic diagram of 6 antenna port situations;
Figure 10 is terminal another data map schematic diagram under 6 antenna port situations of lowest version LTE system;
Figure 11 is that the terminal of lowest version LTE system is at next data map schematic diagram of 8 antenna port situations;
Figure 12 is terminal another data map schematic diagram under 8 antenna port situations of lowest version LTE system;
Figure 13 is that the terminal of LTE-A system is at next data map schematic diagram of 6 antenna port situations;
Figure 14 is terminal another data map schematic diagram under 6 antenna port situations of LTE-A system;
Figure 15 is that the terminal of LTE-A system is at next data map schematic diagram of 8 antenna port situations;
Figure 16 is terminal another data map schematic diagram under 8 antenna port situations of LTE-A system.
Embodiment
Basic thought of the present invention is: under the maximum antenna port number situation that the antenna port number is supported greater than the transmission of lowest version LTE system descending, adopt the present invention, to adopt different mapping modes to realize the data carrier mapping respectively to the terminal of lowest version LTE system and the terminal of LTE-A system.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme.
As shown in Figure 8, a kind of method of mapping downlink data carriers, this method may further comprise the steps:
Here, this method also comprises: the mapping mode that will realize the data carrier mapping is applied to dissimilar channels; Described channel comprises: control channel, shared channel, broadcast channel, control indicating channel and mix automatic request retransmission indicating channel.
Below maximum antenna port number that the antenna port number is supported greater than lowest version LTE system descending transmission, and the maximum antenna port number both of these case that the antenna port number is supported smaller or equal to the transmission of lowest version LTE system descending is set forth respectively.Following lowest version LTE system can be LTE R8 system.
First kind of situation, under the maximum antenna port number situation that the antenna port number is supported greater than the transmission of lowest version LTE system descending, the mapping mode that adopts at the terminal of lowest version LTE system, the various antenna configurations patterns that transmission is supported based on lowest version LTE system descending adopt the mapping mode of current antenna configurations pattern correspondence to carry out the carrier wave mapping.Here, the antenna configurations pattern comprises: 0,1}, 0,1} or 0,1,2,3}.When the antenna configurations pattern that adopts is the maximum antenna configuration mode that the transmission of lowest version LTE system descending is supported, promptly { 0,1,2, when the pairing mapping mode of 3} carries out the data carrier mapping, data carrier mapping effect is better, its reason is that in multiaerial system, the channel capacity of system is directly proportional with number of antennas, antenna port increases, and can obtain bigger diversity gain.When the antenna port number transmits the maximum antenna port number of being supported greater than lowest version LTE system descending, this moment, system was for lowest version LTE system, there are enough antenna port numbers to support the maximum antenna port number that the transmission of lowest version LTE system descending is supported, can obtain bigger space diversity gain and spatial multiplexing gain with the maximum antenna configuration mode.
Wherein, adopt mapping mode to realize also comprising the operation of obtaining the RB that is distributed before the data carrier mapping, behind the RB that distributes obtaining, content aspect the shared afoul situation of RE of the pilot tone of shared RE of mapped data and mapping comprises two in RB.
First aspect, the shared RE of mapped data with adopt the LTE-A system after relative lowest version LTE system increase newly under the shared RE phase conflict situations of the pilot tone of the corresponding mapping of antenna port, to the mapping mode of the terminal employing of lowest version LTE system further be: the mapped data and the pilot tone of the mapping of current RE correspondence of current RE correspondence are chosen normalized different weight w
1And w
2Stack emission after the weighting; Wherein, w
1For more than or equal to 0 weights, w
2For greater than 0 weights.Further, at the mapping mode that the terminal of lowest version LTE system adopts, the preferred version that is adopted is specially: choose w
1=0, w
2=1, promptly on current RE to the punching of the mapped data of current RE correspondence, only with the pilot transmission of the mapping of current RE correspondence.That is to say, the current RE position of mapped data from current RB of current RE correspondence destroyed, to the emission of the mapped data of current RE correspondence, only with the pilot transmission of the mapping of current RE correspondence.
On the other hand, at the shared RE of mapped data, with adopt lowest version LTE system in the shared RE of the pilot tone of the corresponding mapping of already present antenna port mutually under the conflict situations, the mapping mode that the terminal of lowest version LTE system is adopted further is: the mapped data of current RE correspondence is mapped to: on the shared RE of next adjacent not mapped pilot tone.
Under first kind of situation, the mapping mode that adopts at the terminal of LTE-A system, the mapping mode that the terminal of LTE-A system is adopted is specially: mapped data is mapped on the shared RE of the pilot tone of the mapping that is not transmitted the antenna port correspondence, that is to say, carrier wave is mapped in the shared enterprising line data mapping of RE of pilot tone that is not transmitted the antenna port correspondence mappings.This shared RE of mapped data that avoids, the shared afoul mapping mode of RE of the pilot tone of the mapping corresponding with antenna port can be called the mode of hiding.
Second kind of situation, under the maximum antenna port number situation that the antenna port number is supported smaller or equal to the transmission of lowest version LTE system descending, all adopt identical mapping mode to carry out the data carrier mapping to the terminal of lowest version LTE system and the terminal of LTE-A system.This identical mapping mode is specially: mapped data is mapped on the shared RE of not mapped pilot tone, that is to say, carrier wave is mapped in the shared enterprising line data mapping of RE of pilot tone that is not transmitted the antenna port correspondence mappings, the mode of promptly hiding.
Method embodiment one:
Step 201, obtain in the RB that distributes the RE position that the pilot tone of each public guide frequency respective antenna port mapping is shared.
Here, the RE that takies of the pilot tone of corresponding different antennae port mapping is expressed as
Expression corresponding to the pilot tone of antenna port p corresponding RE in certain RB be (k, l).Wherein, p=0,1,2,3,4,5,6,7; K represents frequency indices, Domain Index when l represents, the two-dimensional array that is made of k and l (k, l) position of expression RE in resource mapping schematic diagram.
Step 202, determine that the classification of user terminal is the terminal of LTE system or the terminal of LTE-A system.
Step 203, judge the maximum antenna port number whether the antenna port number is supported greater than the transmission of lowest version LTE system descending.
The shared RE position of pilot tone of step 204, the public guide frequency respective antenna port mapping that obtains according to step 201, and, adopt corresponding mapping mode to carry out the mapping of data carrier according to the different judged results of step 203.
Wherein, when judged result is: the transmitting antenna port number of current emission side is less than or equal to 4, then shines upon according to the mapping mode that defines in the LTE R8 system.Specifically, when the transmitting antenna port number was less than or equal to 4, it was that the antenna configurations pattern comprises: { 0}, { 0 that possible antenna port uses combination, 1} or { 0,1,2,3} when data are shone upon in the RB that distributes, is mapped on the RE that is not used to pilot transmission in the RB.That is to say, in RB, mapped data is mapped on the shared RE of the pilot tone of the mapping that is not transmitted the antenna port correspondence, be the mode of hiding.The mapping order is according to the at first mapping on the frequency domain direction, the mapping on the time-domain direction then.
When judged result is: the transmitting antenna port number of current emission side then carries out the mapping of data carrier respectively to the terminal of lowest version LTE system and the terminal of LTE-A system greater than 4 according to different mapping modes.When the transmitting antenna port number of emission side greater than 4 the time, possible antenna port use combination be the high-order antenna configuration mode comprise 0,1,2,3,4,5} or 0,1,2,3,4,5,6,7}.
At the terminal of lowest version LTE system, when data are shone upon in the RB that distributes, be mapped in the RB and be not transmitted 0,1,2, on the shared RE of the pilot tone of 3} antenna port correspondence.That is to say, in RB, mapped data is mapped on the shared RE of the pilot tone of the mapping that is not transmitted the antenna port correspondence, be the mode of hiding.And the mapping order is according to the at first mapping on the frequency domain direction, the mapping on the time-domain direction then.Yet, because the highest support antenna port number of lowest version LTE system descending transmission is 4 antenna configurations pattern, therefore, in mapping process, because antenna port { 4, the existence of 5}, { 4, the shared RE RE shared with transmitting the LTE terminal data of the pilot tone of 5} correspondence clashes to make the transmit antenna port.At this moment, current RE is gone up data punching waiting for transmission do not launch, only current RE is gone up pilot transmission waiting for transmission; Perhaps to current RE go up data waiting for transmission and pilot tone waiting for transmission with different weights weightings after stack launch.Here, so-called punching refers to: current RE is gone up corresponding data remove.
At the terminal of LTE-A system, when data are shone upon in the RB that distributes, be mapped in both not by { 0,1,2, on the shared RE of the pilot tone of 3} antenna port correspondence, be not transmitted again the antenna port that increases newly 4,5} or { 4,5,6, on the shared RE of the pilot tone of 7} correspondence.That is to say, terminal for the LTE-A system, because LTE-A system itself just supports the antenna configurations pattern of maximum 8 antenna ports, therefore, the terminal of LTE-A system is to be mapped in not to be used to transmit the last and transmission of the shared RE of the pairing pilot tone of all common antenna port.
Below respectively under the high-order antenna configuration mode, the terminal mapping downlink data carriers of the terminal of lowest version LTE system and LTE-A system gives an actual example and sets forth.
Example one is: the example of the mapping downlink data carriers of the terminal of lowest version LTE system under the high-order antenna configuration mode.As the resource mapping schematic diagram of the terminal data mapping of Fig. 9～Figure 12 shows that lowest version LTE system, wherein, Fig. 9 and Figure 10 are the situation of 6 antenna ports; Figure 11 and Figure 12 are the situation of 8 antenna ports.Among Fig. 9～Figure 12, related R
pThe shared RE of pilot tone of expression transmit antenna port p, p=0,1,2,3,4,5,6,7; R
0Fill R with right oblique line
1Fill R with left oblique line
2Fill R with sparse horizontal line
3Fill R with sparse vertical line
4Fill R with intensive point
5Fill R with intensive horizontal line
6Fill with staggered line anyhow; R
7Fill with staggered oblique line, unfilled blank position is the shared RE of mapped data when being used for mapping downlink data carriers.
Specifically, in Fig. 9, the antenna port that increases newly 4, the pilot tone of 5} correspondence be mapped in the penult OFDM symbol of first time slot in the subframe with antenna port 2, the frequency location that 3} is identical.Among Figure 10, the antenna port that increases newly 4, and the pilot tone of 5} correspondence be mapped in the subframe in first time slot in last OFDM symbol with antenna port 2, the frequency location that 3} is identical.From Fig. 9 and Figure 10 as can be seen, the terminal of lowest version LTE system is for { 0,1,2, the mode of RE position by hiding of the pilot tone of 3} antenna port correspondence mapping promptly is mapped in mapped data in RB on the shared RE of the pilot tone of the mapping that is not transmitted the antenna port correspondence; { 4, compatibility is carried out by the mode of punching in the RE position of the pilot tone mapping of 5} correspondence and for antenna port.In Fig. 9, data 49,52 have been destroyed, 55 and 58; In Figure 10, data 61,64 have been destroyed, 67 and 70.
In Figure 11, the antenna port { 4 that increases newly, the pilot tone of 5} correspondence is mapped in the penult OFDM symbol of first time slot in the subframe and antenna port { 2, the frequency location that 3} is identical, the antenna port { 6 that increases newly, the pilot tone of 7} correspondence be mapped in last the OFDM symbol of first time slot in the subframe with antenna port 2, the frequency location that 3} is identical.Among Figure 12, the antenna port { 4 that increases newly, the pilot tone of 5} correspondence is mapped in the subframe in first time slot in last OFDM symbol and antenna port { 2, the frequency location that 3} is identical, the antenna port { 6 that increases newly, the pilot tone of 7} correspondence be mapped in the 3rd the OFDM symbol of second time slot in the subframe with antenna port 2, the frequency location that 3} is identical.From Figure 11 and Figure 12 as can be seen, the terminal of lowest version LTE system is for { 0,1,2, the mode of RE position by hiding of the pilot tone of 3} antenna port correspondence mapping promptly is mapped in mapped data in RB on the shared RE of the pilot tone of the mapping that is not transmitted the antenna port correspondence; { 4,5,6, compatibility is carried out by the mode of punching in the RE position of the pilot tone mapping of 7} correspondence and for antenna port.In Figure 11, data 49,52 have been destroyed, 55,58,61,64,67 and 70; In Figure 12, data 61,64 have been destroyed, 67,70,89,92,95 and 98.
Example two is: the example of the mapping downlink data carriers of the terminal of LTE-A system under the high-order antenna configuration mode.As the resource mapping schematic diagram of the terminal data mapping of Figure 13～Figure 16 shows that LTE-A system, wherein, Figure 13 and Figure 14 are the situation of 6 antenna ports; Figure 15 and Figure 16 are the situation of 8 antenna ports.Among Figure 13～Figure 16, related R
pThe shared RE of pilot tone of expression transmit antenna port p, p=0,1,2,3,4,5,6,7; R
0Fill R with right oblique line
1Fill R with left oblique line
2Fill R with sparse horizontal line
3Fill R with sparse vertical line
4Fill R with intensive point
5Fill R with intensive horizontal line
6Fill with staggered line anyhow; R
7Fill with staggered oblique line, unfilled blank position is the shared RE of mapped data when being used for mapping downlink data carriers.
Identical among the RE position of the corresponding pilot tone mapping of the antenna port among Figure 13 and Figure 14 and Fig. 9 and Figure 10.From Figure 13 and Figure 14 as can be seen, the terminal of LTE-A system is for { 0,1,2,3,4, the RE position of the pilot tone mapping of 5} antenna port correspondence is the mode by hiding all, promptly in RB, mapped data is mapped on the shared RE of the pilot tone of the mapping that is not transmitted the antenna port correspondence, does not carry out the punching of any data.
Identical among the RE position of the corresponding pilot tone mapping of the antenna port among Figure 15 and Figure 16 and Figure 11 and Figure 12.From Figure 15 and Figure 16 as can be seen, the terminal of LTE-A system is for { 0,1,2,3,4,5,6, the RE position of the pilot tone mapping of 7} antenna port correspondence is the mode by hiding all, promptly in RB, mapped data is mapped on the shared RE of the pilot tone of the mapping that is not transmitted the antenna port correspondence, does not carry out the punching of any data.
For instance, comparison diagram 9 and Figure 13, R
0～R
3Pairing antenna port is existing in the lowest version LTE system, R
4And R
5Pairing antenna port increases newly after adopting the LTE-A system.With R
4Be example, among Fig. 9, terminal for lowest version LTE system, consider the compatibility of the terminal of the terminal of lowest version LTE system and LTE-A system, adopt the mapping mode of the present invention to the data punching, data among Fig. 9 49 are destroyed, and promptly data 49 are not shone upon and are transmitted, and are R in data and the afoul current RE of pilot tone only
4On transmitted R
4The pilot tone of institute's respective antenna port.And among Figure 13,, adopt the mode hide for the terminal of LTE-A system, and promptly in RB, mapped data is mapped on the shared RE of the pilot tone of the mapping that is not transmitted the antenna port correspondence, do not carry out the punching of any data, then the data among Figure 13 49 are at R
4Next adjacent RE location map and transmission.
Need to prove, among Fig. 9～Figure 12 and Figure 13～Figure 16 just to the signal mapping downlink data carriers mapping mode, the different channels type is not divided, the present invention realizes that the mapping mode of data carrier mapping can be applied to dissimilar channels, and channel comprises: the automatic request retransmission indicating channel of mixing of the broadcast channel of the control channel of physical layer, the shared channel of physical layer, physical layer, the control indicating channel of physical layer, physical layer.Then the data among the figure have comprised the data message of the control channel of physical layer, the shared channel of physical layer, the broadcast channel of physical layer, the control indicating channel of physical layer, the automatic request retransmission indicating channel of mixing of physical layer etc.Though each channel may only take a part of resource among each RB, the perhaps part resource among a plurality of RB of each channel occupancy,, in mapping process, can adopt the present invention to realize the mapping mode of data carrier mapping.
A kind of system of mapping downlink data carriers, this system comprises: judging unit and data carrier mapping realize the unit.Wherein, judging unit is used to judge whether the antenna port number transmits the maximum antenna port number of being supported greater than lowest version LTE system descending, and the mapping of judged result notification data carrier wave is realized the unit.The data carrier mapping realizes the unit, and being used to receive content is the judged result that is, and to the terminal of lowest version LTE system and the terminal of LTE-A system, adopts different mapping modes to realize the data carrier mapping respectively; Perhaps, the data carrier mapping realizes the unit, be used to receive content and be judged result not, and to the terminal of lowest version LTE system and the terminal of LTE-A system, all adopt identical mapping mode to realize the data carrier mapping, promptly realize the data carrier mapping according to the mapping mode of lowest version LTE system.
Here, the data carrier mapping realizes the unit, be further used at the shared RE of mapped data, increase newly under the shared RE conflict situations of the pilot tone of the corresponding mapping of antenna port with relative lowest version LTE system, the terminal of lowest version LTE system is adopted: the mapped data and the pilot tone of the mapping of current RE correspondence of current RE correspondence are chosen normalized different weight w
1And w
2The mapping mode of stack emission after the weighting; Wherein, w
1For more than or equal to 0 weights, w
2For greater than 0 weights.Further, the data carrier mapping realizes the unit, is used for adopting: choose w
1=0, w
2=1, promptly on current RE to the punching of the mapped data of current RE correspondence, only with the mapping mode of the pilot transmission of the mapping of current RE correspondence.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the method for a mapping downlink data carriers, it is characterized in that, this method comprises: judge whether the antenna port number transmits the maximum antenna port number of being supported greater than lowest version Long Term Evolution LTE system descending, if, then, adopt different mapping modes to realize the data carrier mapping respectively to the terminal of the terminal of described lowest version LTE system and senior Long Term Evolution LTE-A system; Otherwise the terminal to the terminal of described lowest version LTE system and described LTE-A system all adopts identical mapping mode to realize the data carrier mapping.
2. method according to claim 1, it is characterized in that, under the maximum antenna port number situation that the antenna port number is supported greater than lowest version LTE system descending transmission, the mapping mode that the terminal of lowest version LTE system is adopted is specially: the mapping mode of the maximum antenna configuration mode correspondence that transmission is supported according to lowest version LTE system descending carries out the data carrier mapping.
3. method according to claim 2, it is characterized in that, at the shared Resource Unit RE of mapped data, increase newly under the shared RE conflict situations of the pilot tone of the corresponding mapping of antenna port with relative lowest version LTE system, the described mapping mode that the terminal of lowest version LTE system is adopted further is: the mapped data and the pilot tone of the mapping of current RE correspondence of current RE correspondence are chosen normalized different weight w
1And w
2Stack emission after the weighting; Wherein, w
1For more than or equal to 0 weights, w
2For greater than 0 weights.
4. method according to claim 3 is characterized in that, the described mapping mode that the terminal of lowest version LTE system is adopted is specially: choose w
1=0, w
2=1.
5. method according to claim 2, it is characterized in that, at the shared RE of mapped data, under the shared RE conflict situations of the pilot tone of the mapping that already present antenna port is corresponding in the lowest version LTE system, the mapping mode that described terminal to lowest version LTE system adopts further is: the mapped data of current RE correspondence is mapped to: on the shared RE of next adjacent not mapped pilot tone.
6. method according to claim 1, it is characterized in that, under the maximum antenna port number situation that the antenna port number is supported greater than lowest version LTE system descending transmission, the mapping mode that the terminal of LTE-A system is adopted is specially: mapped data is mapped on the shared RE of not mapped pilot tone;
Under the maximum antenna port number situation that the antenna port number is supported smaller or equal to lowest version LTE system descending transmission, the same map mode that the terminal of the terminal of lowest version LTE system and LTE-A system is all adopted is specially: mapped data is mapped on the shared RE of not mapped pilot tone.
7. according to each described method in the claim 1 to 6, it is characterized in that this method also comprises: the described mapping mode that will realize the data carrier mapping is applied to dissimilar channels; Described channel comprises: control channel, shared channel, broadcast channel, control indicating channel and mix automatic request retransmission indicating channel.
8. the system of a mapping downlink data carriers is characterized in that, this system comprises: judging unit and data carrier mapping realize the unit; Wherein,
Judging unit is used to judge whether the antenna port number transmits the maximum antenna port number of being supported greater than lowest version LTE system descending, and notifies described data carrier mapping to realize the unit judged result;
Data carrier mapping realizes the unit, and being used to receive content is the judged result that is, and to the terminal of described lowest version LTE system and the terminal of LTE-A system, adopts different mapping modes to realize the data carrier mapping respectively; Perhaps, be used to receive content and be judged result not, and, all adopt identical mapping mode to realize the data carrier mapping the terminal of the terminal of described lowest version LTE system and described LTE-A system.
9. system according to claim 8, it is characterized in that, described data carrier mapping realizes the unit, be further used at the shared RE of mapped data, increase newly under the shared RE conflict situations of the pilot tone of the corresponding mapping of antenna port with relative lowest version LTE system, the terminal of lowest version LTE system is adopted: the mapped data and the pilot tone of the mapping of current RE correspondence of current RE correspondence are chosen normalized different weight w
1And w
2The mapping mode of stack emission after the weighting; Wherein, w
1For more than or equal to 0 weights, w
2For greater than 0 weights.
10. system according to claim 9 is characterized in that, described data carrier mapping realizes the unit, is further used for adopting: choose w
1=0, w
2=1 mapping mode.
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