CN101778065B - Method and system for mapping downlink data carriers - Google Patents

Method and system for mapping downlink data carriers Download PDF

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CN101778065B
CN101778065B CN 200910076632 CN200910076632A CN101778065B CN 101778065 B CN101778065 B CN 101778065B CN 200910076632 CN200910076632 CN 200910076632 CN 200910076632 A CN200910076632 A CN 200910076632A CN 101778065 B CN101778065 B CN 101778065B
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lte
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CN101778065A (en
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孙云锋
姜静
朱常青
田开波
于辉
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ZTE Corp
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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

Method and system for mapping downlink data carrier
Technical Field
The present invention relates to a downlink data carrier mapping technology, and in particular, to a method and system for downlink data carrier mapping compatible with a low-version LTE system.
Background
In a low-Release LTE system such as a Long Term Evolution R8(LTE R8, Long Term Evolution Release8) system, since the number of transmitting antenna ports supported by the highest downlink is 4, the antenna ports include antenna port 0, antenna port 1, antenna port 2, and antenna port 3; the supported antenna configuration modes are scenes of one, two or four antenna ports, and the antenna configuration modes comprise {0}, {0, 1} or {0, 1, 2, 3 }. Therefore, in LTE R8, a common pilot mapping method for at most 4 antenna ports is given, and the roles of such pilots include: detection of signals and measurement of channel quality, etc.
In the prior art, the pilots corresponding to the 4 antenna ports are multiplexed with data in a full Frequency band by Frequency Division Multiplexing (FDM) manner, and in order to avoid pilot of the neighboring cellsAnd (3) frequency position conflict, and in different cells, using cell identification to generate frequency domain offset, so that pilot frequency positions of adjacent cells are kept orthogonal as much as possible. The method for pilot frequency mapping specifically comprises the following steps: pilot frequency sequence
Figure GDA00002991299000011
To be mapped to complex modulation symbols
Figure GDA00002991299000012
As antenna port p at nsReference symbol of time slot, the calculation formula adopted is a k , l ( p ) = r 1 , n s ( m ′ ) .
Wherein k is 6m + (v + v)shift)mod6； l = 0 , N symb DL - 3 ifp ∈ { 0 , 1 } 1 ifp ∈ { 2 , 3 } ; m = 0 , 1 , · · · , 2 · N RB DL - 1 ;
Figure GDA00002991299000016
Here, k denotes a frequency domain index, l denotes a time domain index, and a two-dimensional array (k, l) composed of k and l denotes a position of a Resource Element (RE) in the Resource mapping diagram;
Figure GDA00002991299000017
indicating the number of frequency domain Resource Blocks (RBs) corresponding to a downlink bandwidth;
Figure GDA00002991299000018
indicating the number of frequency domain RBs corresponding to the maximum bandwidth in the downlink;
Figure GDA00002991299000019
indicating the OFDM symbol number of each downlink time slot; variables v and vshiftIndicates the position of different pilots in the frequency domain, where v is indicated as v = 0 ifp = 0 andl = 0 3 ifp = 0 andl ≠ 0 3 ifp = 1 andl = 0 0 ifp = 1 andl ≠ 0 3 ( n s mod 2 ) ifp = 2 3 + 3 ( n s mod 2 ) ifp = 3 , The cell-specific frequency offset is denoted as
Figure GDA00002991299000022
Where x mod y denotes modulo y by x.
Fig. 1 to fig. 7 are schematic resource mapping diagrams of downlink pilot mapping of any antenna port in different antenna configuration modes under the condition of short Cyclic Prefix (CP) in an LTE R8 system in the prior art. And the antenna configuration mode is {0, 1}, {0, 1} or {0, 1, 2, 3 }. A two-dimensional array (k, l) of k and l represents the location of the RE in the resource mapping diagram, where RpRE occupied by pilot of transmission antenna port p, p is 0, 1, 2, 3; r0Filled with left diagonal lines, R1Filled with right slashes, R2Filled with vertical lines, R3Filling with transverse lines; the positions filled with cross lines indicate that the pilots are orthogonal, as fig. 2 and fig. 3 collectively correspond to a scenario with 2 antenna ports, i.e., the antenna configuration mode is {0, 1}, and the RE occupied by antenna port 0 is orthogonal to the RE occupied by antenna port 1; and the unfilled blank positions are RE occupied by mapped data when used for downlink data carrier mapping. As can be seen, when data carrier mapping is performed in the LTE R8 system, REs occupied by mapped data are: the REs occupied by the unmapped pilots in the allocated RBs, i.e., the REs occupied by the mapped data in the RBs do not collide with the REs occupied by the mapped pilots.
With the continuous evolution and development of the LTE system, an enhanced Long term evolution-advanced (LTE-a) system is developed, and in the LTE-a system, in order to further improve the spectrum efficiency of the system, a requirement that a downlink supports at most 8 antenna ports appears, and then downlink data carrier mapping in an antenna configuration mode of more than 4 antenna ports in the LTE-a system appears. Here, the antenna configuration mode larger than 4 antenna ports is a high-order antenna configuration mode. However, the number of the highest supported transmit antenna ports of the downlink of the current LTE R8 system is 4, and in the case of coexistence of the LTE R8 system and the LTE-a system, the problem of compatibility between the LTE R8 system and the LTE-a system needs to be solved, that is: and when the data carrier mapping is carried out, the terminal of the LTE-A system can be backward compatible with the terminal of the LTE R8 system.
In the LTE-a system, since the terminal of the LTE-a system and the terminal of the LTE R8 system need to be compatible with each other. Therefore, on the one hand, false detection is involved. Specifically, under the 8-antenna port condition, the mutual influence between the newly added 4 antenna ports and the terminal of the LTE R8 system when performing downlink data carrier mapping needs to be considered, otherwise, the demapping of the terminal of the LTE R8 system to the carrier needs to be influenced. That is to say, the downlink of the lte 8 system supports 4 antenna ports at the highest, and the pilots corresponding to the newly added 4 antenna ports cannot be correctly identified, so that the problem of erroneously detecting the pilots corresponding to the newly added 4 antenna ports as data occurs, and meanwhile, the data may cause interference to the pilots of the newly added 4 antenna ports. Another aspect relates to channel policy. Specifically, for users of the LTE-a system, the newly added 4 antenna ports are to further improve the spectral efficiency of the system, and in order to fully exert the functions of the 8 antenna ports, it is necessary to obtain accurate channel information as much as possible, and if the insertion position density of the pilots corresponding to the newly added 4 antenna ports in the frequency domain is limited, the channel strategy of the newly added 4 antenna ports is affected. Specifically, the channel policy means that if accurate channel information cannot be obtained, rank information of a channel with good channel quality of each spatial subchannel cannot be accurately obtained, so that an optimal antenna configuration mode cannot be selected according to a channel condition, and detection of data is affected. Therefore, in the LTE-a system, when mapping downlink data carriers in the high-order antenna configuration mode for the pilot mapping corresponding to the newly added 4 antenna ports, the compatibility problem with the terminal of the LTE R8 system needs to be fully considered. Currently, there is no effective solution to this compatibility problem.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and a system for downlink data carrier mapping, which comprehensively consider two aspects of compatibility with a low-version LTE system terminal and channel information acquisition for an LTE-a terminal, so that the LTE-a system can realize backward compatibility with the low-version LTE system terminal when mapping downlink data carriers in a high-order antenna configuration mode.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for downlink data carrier mapping, the method comprising: judging whether the number of the antenna ports is larger than the maximum number of the antenna ports supported by downlink transmission of a low-version Long Term Evolution (LTE) system;
if the number of the antenna ports is larger than the maximum number of the antenna ports supported by downlink transmission of the low-version LTE system, a mapping mode adopted when the terminal of the low-version LTE system is subjected to data carrier mapping is as follows: carrying out data carrier mapping according to a mapping mode corresponding to a maximum antenna configuration mode supported by downlink transmission of a low-version LTE system; the mapping mode adopted when the terminal of the LTE-A system realizes the data carrier mapping is as follows: mapping the mapped data on resource units (RE) occupied by the unmapped pilot;
and if the number of the antenna ports is less than or equal to the maximum number of the antenna ports supported by downlink transmission of the low-version LTE system, the same mapping mode is adopted for both the terminal of the low-version LTE system and the terminal of the LTE-A system to realize data carrier mapping.
Wherein, under the condition that the resource unit RE occupied by the mapped data conflicts with the RE occupied by the mapped pilot frequency corresponding to the newly added antenna port of the relatively low-version LTE system, the mapping mode adopted by the terminal of the low-version LTE system further comprises: selecting normalized different weight values w from the mapped data corresponding to the current RE and the mapped pilot frequency corresponding to the current RE1And w2Carrying out superposition emission after weighting; wherein, w1Is a weight value of 0 or more, w2A weight greater than 0.
The mapping mode adopted by the terminal of the low-version LTE system is specifically as follows: selecting w1＝0，w2＝1。
Wherein, under the condition that the RE occupied by the mapped data conflicts with the RE occupied by the mapped pilot frequency corresponding to the antenna port existing in the low-version LTE system, the mapping mode adopted for the terminal of the low-version LTE system further includes: mapping the mapped data corresponding to the current RE to: on the RE occupied by the next adjacent unmapped pilot.
The mapping mode adopted by the terminal of the LTE-A system is specifically as follows under the condition that the number of the antenna ports is greater than the maximum number of the antenna ports supported by downlink transmission of the low-version LTE system: mapping the mapped data on the RE occupied by the unmapped pilot;
the same mapping mode adopted by the terminal of the low-version LTE system and the terminal of the LTE-A system is specifically as follows under the condition that the number of the antenna ports is less than or equal to the maximum number of the antenna ports supported by the downlink transmission of the low-version LTE system: and mapping the mapped data on the RE occupied by the unmapped pilot.
Wherein, the method also comprises: applying the mapping mode for realizing data carrier mapping to different types of channels; the channel includes: control channel, shared channel, broadcast channel, control indication channel, and hybrid automatic repeat request indication channel.
A system for downlink data carrier mapping, the system comprising: a judging unit and a data carrier mapping realizing unit; wherein,
a judging unit, configured to judge whether the number of antenna ports is greater than the maximum number of antenna ports supported by downlink transmission in the low-version LTE system, and notify the data carrier mapping implementation unit of a judgment result;
a data carrier mapping implementation unit, configured to receive a determination result that the content is yes, where a mapping manner adopted when implementing data carrier mapping for a terminal of the low-version LTE system is as follows: carrying out data carrier mapping according to a mapping mode corresponding to a maximum antenna configuration mode supported by downlink transmission of a low-version LTE system; the mapping mode adopted when the data carrier mapping is realized for the terminal of the LTE-A system is as follows: mapping the mapped data on the RE occupied by the unmapped pilot; or, receiving a judgment result that the content is negative, and implementing data carrier mapping for the terminal of the low-version LTE system and the terminal of the LTE-A system by adopting the same mapping mode.
The data carrier mapping implementation unit is further configured to, in a case that an RE occupied by mapped data conflicts with an RE occupied by a mapped pilot corresponding to a newly added antenna port of the low-version LTE system, adopt, to a terminal of the low-version LTE system: selecting normalized different weight values w from the mapped data corresponding to the current RE and the mapped pilot frequency corresponding to the current RE1And w2A mapping mode of superposition transmission after weighting; wherein, w1Is a weight value of 0 or more, w2A weight greater than 0.
Wherein the data carrier mapping implementation unit is further configured to employ: selecting w1＝0，w 21 as the mapping mode.
In the method, under the condition that the number of the antenna ports is greater than the maximum number of the antenna ports supported by downlink transmission of the low-version LTE system, different mapping modes are respectively adopted for the terminal of the low-version LTE system and the terminal of the LTE-A system to realize data carrier mapping; and under the condition that the number of the antenna ports is less than or equal to the maximum number of the antenna ports supported by the downlink transmission of the low-version LTE system, the same mapping mode is adopted for the terminal of the low-version LTE system and the terminal of the LTE-A system to realize data carrier mapping.
The invention considers the error detection and the channel estimation accuracy, when the maximum antenna port number supported by the downlink transmission of the LTE-A system relative to the low-version LTE system is increased, namely the number of the antenna ports is larger than the maximum antenna port number supported by the downlink transmission of the low-version LTE system, the invention respectively adopts different mapping modes to realize the data carrier mapping for the terminal of the low-version LTE system and the terminal of the LTE-A system. Here, the low-release LTE system may be an LTE R8 system, so that when the LTE R8 system and the LTE-a system coexist, the compatibility problem between the LTE R8 system and the LTE-a system is solved, that is: and when the data carrier mapping is carried out, the terminal of the LTE-A system can be backward compatible with the terminal of the LTE R8 system. That is to say, the influence on the terminal compatible with the LTE R8 system after the high-order antenna configuration mode is introduced in the LTE-a system is solved, so that the terminal of the LTE R8 system and the terminal of the LTE-a system can be compatible with each other when downlink data carrier mapping is implemented.
Drawings
FIG. 1 is a diagram illustrating a pilot resource mapping when the antenna configuration mode is {0 };
FIG. 2 is a diagram illustrating a pilot mapping of antenna port 0 when the conventional antenna configuration mode is {0, 1 };
fig. 3 is a diagram illustrating pilot mapping of antenna port 1 when the conventional antenna configuration mode is {0, 1 }.
Fig. 4 is a schematic diagram of pilot mapping of antenna port 0 when the conventional antenna configuration mode is {0, 1, 2, 3 };
fig. 5 is a schematic diagram of pilot mapping of antenna port 1 when the conventional antenna configuration mode is {0, 1, 2, 3 };
fig. 6 is a schematic diagram of pilot mapping of antenna port 2 when the conventional antenna configuration mode is {0, 1, 2, 3 };
fig. 7 is a schematic diagram of pilot mapping of antenna port 3 when the conventional antenna configuration mode is {0, 1, 2, 3 };
FIG. 8 is a schematic flow chart of the implementation of the method of the present invention;
fig. 9 is a diagram illustrating data mapping of a terminal of a low-release LTE system with 6 antenna ports;
fig. 10 is another data mapping diagram of a terminal of a low-release LTE system with 6 antenna ports;
fig. 11 is a schematic diagram of data mapping of a terminal of a low-release LTE system under an 8-antenna port condition;
fig. 12 is another data mapping diagram of a terminal of a low-release LTE system with 8 antenna ports;
fig. 13 is a diagram illustrating data mapping of a terminal of an LTE-a system with 6 antenna ports;
fig. 14 is another data mapping diagram of a terminal of an LTE-a system with 6 antenna ports;
fig. 15 is a schematic diagram of data mapping of a terminal of an LTE-a system with 8 antenna ports;
fig. 16 is a diagram illustrating another data mapping of a terminal in an LTE-a system with 8 antenna ports.
Detailed Description
The basic idea of the invention is: under the condition that the number of the antenna ports is larger than the maximum number of the antenna ports supported by downlink transmission of the low-version LTE system, the invention respectively adopts different mapping modes to realize data carrier mapping for the terminal of the low-version LTE system and the terminal of the LTE-A system.
The following describes the embodiments in further detail with reference to the accompanying drawings.
As shown in fig. 8, a method for mapping downlink data carriers includes the following steps:
step 101, judging whether the number of antenna ports is larger than the maximum number of antenna ports supported by downlink transmission of a low-version LTE system, if so, executing step 102; otherwise, step 103 is performed.
And 102, respectively adopting different mapping modes to realize data carrier mapping for the terminal of the low-version LTE system and the terminal of the LTE-A system, and ending the current downlink data carrier mapping process.
And 103, implementing data carrier mapping on the terminal of the low-version LTE system and the terminal of the LTE-A system in the same mapping mode, and ending the current downlink data carrier mapping process.
Here, the method further includes: applying a mapping mode for realizing data carrier mapping to different types of channels; the channel includes: control channel, shared channel, broadcast channel, control indication channel, and hybrid automatic repeat request indication channel.
The following describes two cases that the number of the antenna ports is greater than the maximum number of the antenna ports supported by downlink transmission of the low-release LTE system, and the number of the antenna ports is less than or equal to the maximum number of the antenna ports supported by downlink transmission of the low-release LTE system. The following low-release LTE system may be an LTE R8 system.
In the first case, when the number of antenna ports is greater than the maximum number of antenna ports supported by downlink transmission of the low-version LTE system, for a mapping mode adopted by a terminal of the low-version LTE system, based on various antenna configuration modes supported by downlink transmission of the low-version LTE system, a mapping mode corresponding to a current antenna configuration mode is adopted for carrier mapping. Here, the antenna configuration mode includes: {0, 1}, {0, 1} or {0, 1, 2, 3 }. When the adopted antenna configuration mode is the maximum antenna configuration mode supported by downlink transmission of the low-version LTE system, namely the data carrier mapping is carried out in the mapping mode corresponding to {0, 1, 2, 3}, the data carrier mapping effect is better. When the number of the antenna ports is larger than the maximum number of the antenna ports supported by the downlink transmission of the low-version LTE system, compared with the low-version LTE system, the system has enough number of the antenna ports to support the maximum number of the antenna ports supported by the downlink transmission of the low-version LTE system, and larger space diversity gain and multiplexing gain can be obtained by using the maximum antenna configuration mode.
The method comprises the following steps of obtaining the allocated RB before the data carrier mapping is realized by adopting a mapping mode, wherein after the allocated RB is obtained, the condition that the RE occupied by the mapped data in the RB conflicts with the RE occupied by the mapped pilot frequency comprises two aspects.
On the first hand, when the RE occupied by the mapped data conflicts with the RE occupied by the mapped pilot frequency corresponding to the newly added antenna port of the low-version LTE system after the LTE-a system is adopted, the mapping mode adopted for the terminal of the low-version LTE system is further as follows: selecting normalized different weight values w from the mapped data corresponding to the current RE and the mapped pilot frequency corresponding to the current RE1And w2Carrying out superposition emission after weighting; wherein, w1Is a weight value of 0 or more, w2A weight greater than 0. Further, for the mapping manner adopted by the terminal of the low-release LTE system, the adopted preferred scheme is specifically as follows: selecting w1＝0，w2That is, the mapped data corresponding to the current RE is punctured on the current RE, and only the mapped pilot corresponding to the current RE is transmitted. That is, the mapped data corresponding to the current RE is dropped from the current RE position in the current RB, and only the mapped pilot corresponding to the current RE is transmitted without transmitting the mapped data corresponding to the current RE.
On the other hand, in the case that the RE occupied by the mapped data conflicts with the RE occupied by the mapped pilot corresponding to the antenna port existing in the low-version LTE system, the mapping method adopted for the terminal of the low-version LTE system is further as follows: mapping the mapped data corresponding to the current RE to: on the RE occupied by the next adjacent unmapped pilot.
In the first case, for the mapping method adopted by the terminal of the LTE-a system, the mapping method adopted by the terminal of the LTE-a system is specifically: and mapping the mapped data on the REs not occupied by the mapped pilot frequency corresponding to the transmission antenna port, that is, mapping the carrier on the REs not occupied by the mapped pilot frequency corresponding to the transmission antenna port for data mapping. Such a mapping manner for avoiding collision between REs occupied by mapped data and REs occupied by mapped pilots corresponding to antenna ports may be referred to as an avoidance manner.
And in the second situation, under the condition that the number of the antenna ports is less than or equal to the maximum number of the antenna ports supported by the downlink transmission of the low-version LTE system, the same mapping mode is adopted for the terminal of the low-version LTE system and the terminal of the LTE-A system to carry out data carrier mapping. The same mapping mode specifically includes: mapping the mapped data on the RE occupied by the pilot frequency which is not mapped, that is, mapping the carrier on the RE occupied by the pilot frequency which is not mapped corresponding to the transmission antenna port for data mapping, that is, avoiding mode.
The first embodiment of the method comprises the following steps:
step 201, obtaining the RE positions occupied by the pilots mapped by the antenna ports corresponding to each common pilot in the allocated RBs.
Here, REs occupied by pilots corresponding to different antenna port mappings are represented asIndicating that the pilot corresponding to antenna port p corresponds to RE (k, l) in a certain RB. Wherein p is 0, 1, 2, 3, 4, 5, 6, 7; k denotes a frequency index, l denotes a time domain index, and a two-dimensional array (k, l) composed of k and l denotes a location of the RE in the resource mapping diagram.
Step 202, determining whether the category of the user terminal is a terminal of an LTE system or a terminal of an LTE-A system.
Step 203, determine whether the number of antenna ports is greater than the maximum number of antenna ports supported by downlink transmission in the low-release LTE system.
Step 204, mapping the data carrier by adopting a corresponding mapping mode according to the RE position occupied by the pilot mapped by the antenna port corresponding to the common pilot obtained in step 201 and according to the different judgment results of step 203.
Wherein, when the judgment result is: and if the number of the transmitting antenna ports of the current transmitting party is less than or equal to 4, mapping according to a mapping mode defined in the LTE R8 system. Specifically, when the number of transmit antenna ports is less than or equal to 4, possible antenna port usage combinations, i.e., antenna configuration modes, include: {0}, {0, 1}, or {0, 1, 2, 3}, data is mapped within an allocated RB on REs within the RB that are not used for pilot transmission. That is, within an RB, mapped data is mapped to REs that are not occupied by mapped pilots corresponding to the transmission antenna ports, i.e., an evasive manner. The mapping order is according to mapping first in the frequency domain direction and then in the time domain direction.
When the judgment result is that: and if the number of the transmitting antenna ports of the current transmitter is more than 4, mapping the data carriers of the terminal of the low-version LTE system and the terminal of the LTE-A system respectively according to different mapping modes. When the number of transmit antenna ports of the transmitting side is greater than 4, possible antenna port usage combinations, i.e., higher-order antenna configuration modes, include {0, 1, 2, 3, 4, 5}, or {0, 1, 2, 3, 4, 5, 6, 7 }.
For a terminal of a low-release LTE system, when data is mapped in an allocated RB, the data is mapped to REs that are not occupied by pilots corresponding to {0, 1, 2, 3} antenna ports that are transmitted in the RB. That is, within an RB, mapped data is mapped to REs that are not occupied by mapped pilots corresponding to the transmission antenna ports, i.e., an evasive manner. And the mapping order is according to the mapping first in the frequency domain direction and then in the time domain direction. However, since the antenna configuration mode with the highest number of antenna ports supported by downlink transmission of the low-version LTE system being 4, in the mapping process, due to the existence of the antenna ports {4, 5}, the REs occupied by the pilots corresponding to the transmission antenna ports {4, 5} collide with the REs occupied by the transmission of LTE terminal data. At this time, the data to be transmitted on the current RE is punched and is not transmitted, and only the pilot frequency to be transmitted on the current RE is transmitted; or the data to be transmitted on the current RE and the pilot frequency to be transmitted are weighted by different weights and then are superposed and transmitted. Here, the perforation means: and removing the corresponding data on the current RE.
For the terminal of the LTE-a system, when mapping data in the allocated RB, the data is mapped on the RE not occupied by the pilot corresponding to the {0, 1, 2, 3} antenna port, or not occupied by the pilot corresponding to the {4, 5} or {4, 5, 6, 7} antenna port to which the data is newly transmitted. That is, for the terminal of the LTE-a system, since the LTE-a system itself supports the antenna configuration mode of at most 8 antenna ports, the terminal of the LTE-a system is mapped and transmitted on the REs occupied by the pilots that are not used for transmitting all common antenna ports.
Examples of mapping downlink data carriers of a terminal of a low-version LTE system and a terminal of an LTE-a system in a high-order antenna configuration mode are described below.
The first example is: example of downlink data carrier mapping for a terminal of a low-release LTE system in a high-order antenna configuration mode. Fig. 9 to 12 are schematic resource mapping diagrams of terminal data mapping of a low-release LTE system, where fig. 9 and 10 are cases of 6 antenna ports; fig. 11 and 12 are the case of 8 antenna ports. R in FIGS. 9 to 12pRE occupied by pilot of transmission antenna port p, p is 0, 1, 2, 3, 4, 5, 6, 7; r0Filled with right slashes, R1Filled with left diagonal lines, R2Filling with sparse transverse lines, R3Filling with sparse vertical lines, R4With dense dot filling, R5Filling with dense transverse lines, R6Filling with staggered horizontal and vertical lines; r7And filling by staggered oblique lines, wherein unfilled blank positions are REs occupied by mapped data when the downlink data carrier is mapped.
Specifically, in fig. 9, the pilots corresponding to the newly added antenna ports {4, 5} are mapped to the same frequency positions as the antenna ports {2, 3} in the second last OFDM symbol of the first slot in the subframe. In fig. 10, the pilots corresponding to the newly added antenna ports {4, 5} are mapped to the same frequency positions as the antenna ports {2, 3} in the last OFDM symbol in the first slot in the subframe. As can be seen from fig. 9 and fig. 10, the terminal of the low-version LTE system performs evasion on the RE positions mapped by the pilots corresponding to the {0, 1, 2, 3} antenna ports, that is, maps the mapped data on the REs not occupied by the mapped pilots corresponding to the transmission antenna ports within the RB; and for the RE position of the pilot mapping corresponding to the antenna port {4, 5}, compatibility is carried out by a puncturing mode. In fig. 9, data 49, 52, 55, and 58 are stamped out; in fig. 10, data 61, 64, 67, and 70 are stamped out.
In fig. 11, the pilot corresponding to the newly added antenna port {4, 5} is mapped to the same frequency location as antenna port {2, 3} in the second last OFDM symbol of the first slot in the subframe, and the pilot corresponding to the newly added antenna port {6, 7} is mapped to the same frequency location as antenna port {2, 3} in the second last OFDM symbol of the first slot in the subframe. In fig. 12, the pilot corresponding to the newly added antenna port {4, 5} is mapped to the same frequency position as antenna port {2, 3} in the last OFDM symbol in the first slot in the subframe, and the pilot corresponding to the newly added antenna port {6, 7} is mapped to the same frequency position as antenna port {2, 3} in the third OFDM symbol in the second slot in the subframe. As can be seen from fig. 11 and fig. 12, the terminal of the low-version LTE system performs evasion on the RE positions mapped by the pilots corresponding to the {0, 1, 2, 3} antenna ports, that is, maps the mapped data on the REs not occupied by the mapped pilots corresponding to the transmission antenna ports within the RB; and for the RE positions of the pilot mapping corresponding to the antenna ports {4, 5, 6, 7}, compatibility is carried out in a puncturing mode. In fig. 11, data 49, 52, 55, 58, 61, 64, 67, and 70 are stamped out; in fig. 12, data 61, 64, 67, 70, 89, 92, 95, and 98 are punched out.
Example two is: example of downlink data carrier mapping for a terminal of an LTE-a system in a high-order antenna configuration mode. Fig. 13 to 16 are schematic resource mapping diagrams of terminal data mapping of an LTE-a system, where fig. 13 and 14 are cases of 6 antenna ports; fig. 15 and 16 are the case of 8 antenna ports. R in FIGS. 13 to 16pRE, which represents the occupation of the pilot of the transmit antenna port p, p-0,1，2，3，4，5，6，7；R0filled with right slashes, R1Filled with left diagonal lines, R2Filling with sparse transverse lines, R3Filling with sparse vertical lines, R4With dense dot filling, R5Filling with dense transverse lines, R6Filling with staggered horizontal and vertical lines; r7And filling by staggered oblique lines, wherein unfilled blank positions are REs occupied by mapped data when the downlink data carrier is mapped.
The RE positions of the antenna port corresponding pilot maps in fig. 13 and 14 are the same as those in fig. 9 and 10. As can be seen from fig. 13 and 14, the terminal in the LTE-a system maps the RE positions mapped by the pilots corresponding to the {0, 1, 2, 3, 4, 5} antenna ports in an evasive manner, i.e., maps the mapped data to the REs not occupied by the mapped pilots corresponding to the transmission antenna ports within the RB, and does not perform any data puncturing.
The RE positions of the antenna port corresponding pilot maps in fig. 15 and 16 are the same as those in fig. 11 and 12. As can be seen from fig. 15 and fig. 16, the terminal in the LTE-a system performs evasion on all RE positions mapped by the pilots corresponding to the {0, 1, 2, 3, 4, 5, 6, 7} antenna ports, that is, maps the mapped data to the REs not occupied by the mapped pilots corresponding to the transmission antenna ports within the RB, and does not perform any data puncturing.
For example, comparing FIG. 9 with FIG. 13, R0～R3The corresponding antenna port is existed in the low-version LTE system, R4And R5The corresponding antenna ports are newly added after the LTE-A system is adopted. With R4For example, in fig. 9, for the terminal of the low-release LTE system, considering the compatibility between the terminal of the low-release LTE system and the terminal of the LTE-a system, the data puncturing mapping method of the present invention is adopted, and the data 49 in fig. 9 is discarded, that is, the data 49 is not mapped and transmitted, and only when the current RE, that is, R, where the data and the pilot collide with each other is present, the data 49 is not mapped and transmitted4To transmit R4Pilot of the corresponding antenna port. In fig. 13, for the terminal of the LTE-a system, an evasive manner is adopted, that is, the terminal usesMapping the mapped data to the RE not occupied by the mapped pilot corresponding to the transmission antenna port within the RB, without puncturing any data, the data 49 in fig. 13 is at R4Next adjacent RE location mapping and transmission.
It should be noted that fig. 9 to 12 and fig. 13 to 16 are only for illustrating the mapping manner of the downlink data carrier mapping, and different channel types are not divided, and the mapping manner of the data carrier mapping implemented by the present invention may be applied to different types of channels, where the channels include: a control channel of a physical layer, a shared channel of the physical layer, a broadcast channel of the physical layer, a control indication channel of the physical layer, and a hybrid automatic repeat request indication channel of the physical layer. The data in the figure includes data information of a control channel of a physical layer, a shared channel of the physical layer, a broadcast channel of the physical layer, a control indication channel of the physical layer, a hybrid automatic repeat request indication channel of the physical layer, and the like. Although each channel may only occupy a part of resources in each RB, or each channel may occupy a part of resources in multiple RBs, the mapping method of mapping data carriers may be implemented in the mapping process according to the present invention.
A system for downlink data carrier mapping, the system comprising: a judging unit and a data carrier mapping realizing unit. The judging unit is used for judging whether the number of the antenna ports is larger than the maximum number of the antenna ports supported by the downlink transmission of the low-version LTE system or not and informing the judging result to the data carrier mapping realizing unit. The data carrier mapping realization unit is used for receiving the judgment result that the content is yes and respectively realizing data carrier mapping for the terminal of the low-version LTE system and the terminal of the LTE-A system by adopting different mapping modes; or, the data carrier mapping implementation unit is configured to receive the determination result indicating that the content is negative, and implement data carrier mapping for the terminal of the low-version LTE system and the terminal of the LTE-a system in the same mapping manner, that is, implement data carrier mapping according to the mapping manner of the low-version LTE system.
Here, the data Carrier mapping implementation sheetThe element is further configured to, in a case that the RE occupied by the mapped data conflicts with the RE occupied by the mapped pilot corresponding to the newly added antenna port of the low-version LTE system, adopt, to the terminal of the low-version LTE system: selecting normalized different weight values w from the mapped data corresponding to the current RE and the mapped pilot frequency corresponding to the current RE1And w2A mapping mode of superposition transmission after weighting; wherein, w1Is a weight value of 0 or more, w2A weight greater than 0. Further, the data carrier mapping implementation unit is configured to employ: selecting w1＝0，w2That is, the mapped data corresponding to the current RE is punctured on the current RE, and only the mapped pilot corresponding to the current RE is transmitted in the mapping manner.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (9)

1. A method for downlink data carrier mapping, the method comprising: judging whether the number of the antenna ports is larger than the maximum number of the antenna ports supported by downlink transmission of a low-version Long Term Evolution (LTE) system;
if the number of the antenna ports is larger than the maximum number of the antenna ports supported by downlink transmission of the low-version LTE system, a mapping mode adopted when the terminal of the low-version LTE system is subjected to data carrier mapping is as follows: carrying out data carrier mapping according to a mapping mode corresponding to a maximum antenna configuration mode supported by downlink transmission of a low-version LTE system; the mapping mode adopted when the terminal of the LTE-A system realizes the data carrier mapping is as follows: mapping the mapped data on resource units (RE) occupied by the unmapped pilot;
and if the number of the antenna ports is less than or equal to the maximum number of the antenna ports supported by downlink transmission of the low-version LTE system, the same mapping mode is adopted for both the terminal of the low-version LTE system and the terminal of the LTE-A system to realize data carrier mapping.
2. The method of claim 1, wherein, in case that the Resource Elements (REs) occupied by the mapped data conflict with REs occupied by the mapped pilot corresponding to the newly added antenna port of the relatively low-version LTE system, the mapping manner adopted for the terminal of the low-version LTE system further comprises: selecting normalized different weight values w from the mapped data corresponding to the current RE and the mapped pilot frequency corresponding to the current RE1And w2Carrying out superposition emission after weighting; wherein, w1Is a weight value of 0 or more, w2A weight greater than 0.
3. The method according to claim 2, wherein the mapping manner adopted for the terminal of the low-release LTE system is specifically: selecting w1＝0，w2＝1。
4. The method according to claim 1, wherein in case that the REs occupied by the mapped data conflict with the REs occupied by the mapped pilots corresponding to the antenna ports already existing in the low-release LTE system, the mapping manner adopted for the terminals of the low-release LTE system further includes: mapping the mapped data corresponding to the current RE to: on the RE occupied by the next adjacent unmapped pilot.
5. The method of claim 1, wherein the same mapping manner adopted for both the terminal of the low-release LTE system and the terminal of the LTE-a system when the number of antenna ports is less than or equal to the maximum number of antenna ports supported by downlink transmission in the low-release LTE system is specifically: and mapping the mapped data on the RE occupied by the unmapped pilot.
6. The method according to any one of claims 1 to 5, characterized in that the method further comprises: applying the mapping mode for realizing data carrier mapping to different types of channels; the channel includes: control channel, shared channel, broadcast channel, control indication channel, and hybrid automatic repeat request indication channel.
7. A system for downlink data carrier mapping, the system comprising: a judging unit and a data carrier mapping realizing unit; wherein,
a judging unit, configured to judge whether the number of antenna ports is greater than the maximum number of antenna ports supported by downlink transmission in the low-version LTE system, and notify the data carrier mapping implementation unit of a judgment result;
a data carrier mapping implementation unit, configured to, when receiving the determination result that the content is yes, implement data carrier mapping for the terminal of the low-version LTE system in the following mapping manner: carrying out data carrier mapping according to a mapping mode corresponding to a maximum antenna configuration mode supported by downlink transmission of a low-version LTE system; the mapping mode adopted when the data carrier mapping is realized for the terminal of the LTE-A system is as follows: mapping the mapped data on the RE occupied by the unmapped pilot; and when a judgment result that the content is negative is received, the same mapping mode is adopted for the terminal of the low-version LTE system and the terminal of the LTE-A system to realize data carrier mapping.
8. The system according to claim 7, wherein the data carrier mapping unit is further configured to map REs occupied by mapped data and REs occupied by mapped pilots corresponding to newly added antenna ports of the relatively low-release LTE systemUnder the sudden situation, the terminal of the low-version LTE system adopts: selecting normalized different weight values w from the mapped data corresponding to the current RE and the mapped pilot frequency corresponding to the current RE1And w2A mapping mode of superposition transmission after weighting; wherein, w1Is a weight value of 0 or more, w2A weight greater than 0.
9. The system of claim 8, wherein the data carrier mapping implementation unit is further configured to employ: selecting w1＝0，w21 as the mapping mode.
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