WO2012065456A1

WO2012065456A1 - Method and device for carrying demodulation reference signal

Info

Publication number: WO2012065456A1
Application number: PCT/CN2011/077438
Authority: WO
Inventors: 孙云锋; 张峻峰; 郭森宝; 许进; 张晨晨
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-11-15
Filing date: 2011-07-21
Publication date: 2012-05-24
Also published as: CN102469059A; CN102469059B

Abstract

Disclosed are a method and device for carrying a demodulation reference signal. The method includes: in an LTE TDD, with configuration parameters for given special subframes, selecting one or two OFDM symbols to carry a demodulation reference signal in a time domain corresponding to the scheduling of a physical resource block by each special subframe, wherein the configuration parameters for the given special subframes include: the ratio configuration of numbers of OFDM symbols occupied by DwPTS, GP and UpPTS in the special subframe parameter configuration of a normal cyclic prefix being 6:6:2 or 6:7:1; and/or the ratio configuration of numbers of OFDM symbols occupied by DwPTS, GP and UpPTS in the special subframe parameter configuration of an extended cyclic prefix being 5:5:2 or 5:7:1. The present invention can solve the problems in the related art of having a great loss in peak/average throughput and low overall efficiency when TD-SCDMA and TD-LTE are matched.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a demodulation reference signal carrying method and apparatus. Background technique

Special time slots in TD-SCDMA (Time Division Synchronized Code Division Multiple Access) are fixedly configured, while TD-LTE (Time Division Long Term Evolution) Special subframes can be flexibly selected according to needs. In implementation, the two system service time slots and special time slots should be synchronized as much as possible to achieve the uplink and downlink between the two systems. Therefore, due to jtb, it should be based on two systems. Service time slot configuration and

In the special time slot situation of TD-SCDMA, the configuration of the special subframe of TD-LTE is reasonably selected. "TS3.211 Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation" (TS3.211 Evolved Universal Mobile Telecommunications System Terrestrial Radio Access System Physical Channel and Modeling), for Time Division Duplex Long Term Evolution System LTE The configuration of the special subframe in the TDD is as shown in Table 1, where the table indicates the downlink pilot transmission time slot (DwPTS), the guard period (GP), and the uplink pilot transmission time slot (UpPTS) in different configurations. The number of OFDM (Orthogonal Frequency Division Multiplex) symbols occupied. Table 1 Configuration of special subframes in LTE TDD (length of DwPTS/GP/UpPTS)

When TD-SCDMA 2: 4 is matched with TD-LTE 1:3, according to the configuration method in the existing LTE (LTE-A (Long Term Evolution Advanced)), in order to achieve synchronization of the two systems, it is reduced. Thousands of interference, LTE TDD only uses configuration 0 and configuration 5 in Table 1, ie The corresponding special subframe configuration parameter is 3: 10: 1 or 3: 9:2. At this time, the DwPTS occupies only 3 symbols and does not carry the symbol of the service signal. The DwPTS in this configuration cannot transmit services, as opposed to the uplink. / Downlink UL/DL is a 2:2 configuration. Although the UL/DL is 1:3, one downlink service subframe data symbol is added. However, due to the ratio limitation of the special subframe, DwPTS is reduced by more than one. The symbol of data transmission, therefore, the peak / average throughput has a large loss, the overall efficiency is low, as shown in Figure 1. Aiming at the problem that the peak/average throughput of TD-SCDMA and TD-LTE are greatly lost in the related art, and the overall efficiency is low, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION A main object of the present invention is to provide a demodulation reference signal carrying method and apparatus, to at least solve the above-mentioned related technologies, where TD-SCDMA and TD-LTE match have large loss in peak/average throughput, and overall efficiency is biased. Low problem. According to an aspect of the present invention, a demodulation reference signal carrying method is provided, including: in a time division duplex long term evolution system LTE TDD, scheduling a specific subframe in a given special subframe configuration parameter Selecting one or two orthogonal frequency division multiplexing OFDM symbols to carry the demodulation reference signal in the time domain corresponding to the physical resource block; wherein, the configuration parameters of the given special subframe include: special subframe parameters in the normal cyclic prefix The number of OFDM symbols occupied by the downlink pilot transmission slot DwPTS, the guard period GP, and the uplink pilot transmission slot UpPTS is configured to be 6:6:2 or 6:7:1; and/or the special clause in the extended cyclic prefix The frame parameters configured for DwPTS, GP, and UpPTS occupy a number of OFDM symbols that are configured to be 5:5:2 or 5:6:1. Preferably, the selecting one or two orthogonal frequency division multiplexing OFDM symbols to carry the demodulation reference signal in the time domain corresponding to each special subframe scheduling physical resource block includes: when the given special sub The frame configuration parameter is configured as the special subframe parameters of the normal cyclic prefix. The number of OFDM symbols occupied by DwPTS, GP, and UpPTS is selected as 6: 6: 2 or 6: 7: 1, and the OFDM symbols located in the 2nd and 3rd bits are selected. Or the 3rd, 5th bit OFDM symbol or the 2nd and 5th bit OFDM symbols carry the demodulation reference signal. Preferably, the demodulation reference signal corresponding to the same port has a frequency domain interval of 4 subcarriers on the same OFDM symbol. Preferably, when the number of layers to be transmitted is less than or equal to 2, port 7 and port 8 are multiplexed in a code division multiplexing manner in the time domain direction. Preferably, when the number of layers to be transmitted is greater than 2 and less than or equal to 4, multiplexing between different ports is performed by combining code division multiplexing in the time domain direction and frequency division multiplexing, wherein port 7 and Port 8 performs code division multiplexing, port 9 and port 10 perform code division multiplexing, and frequency division multiplexing is used between the first group of ports consisting of ports 7 and 8 and the second group of ports consisting of ports 9 and 10. . Preferably, the frequency domain location corresponding to the first group of ports consisting of ports 7, 8 is associated with port 9,

10 The relationship of the frequency domain location ^∞2 corresponding to the second group of ports is: ^m 2 ^{= m} i ^{+ 1} or w ₂ = w, - 1 Preferably, the physical resource block corresponding to each special subframe is scheduled. Selecting one or two orthogonal frequency division multiplexing OFDM symbols to carry the demodulation reference signal in the time domain, including: when the given special subframe configuration parameter is a special subframe parameter of the extended cyclic prefix configured as DwPTS, GP When the ratio of the number of OFDM symbols occupied by the UpPTS is 5:5:2 or 5:6:1, the OFDM symbol located at the 2nd or 4th bit or the OFDM symbol of the 2nd and 4th bits is used for the description. Demodulate the reference signal. Preferably, when the OFDM symbol 7 located in the 2nd and 4th bits is selected to carry the demodulation reference signal, the port 7 and the port 8 are code-multiplexed in a manner of code division multiplexing in the time domain direction. Preferably, the frequency domain directional code division multiplexing method performs code division multiplexing on the adjacent two subcarriers on the adjacent two subcarriers, wherein the adjacent two subcarriers are separated by one or four sub-carriers. Carrier. According to another aspect of the present invention, a demodulation reference signal carrying apparatus is provided, including: a determining module, configured to determine, in an LTE TDD system, a configuration parameter of a special subframe as a configuration parameter of a given special subframe; The configuration parameters of the given special subframe include: the ratio of the number of OFDM symbols occupied by the special subframe parameters in the normal cyclic prefix to the downlink pilot transmission time slot DwPTS, the protection period GP, and the uplink pilot transmission time slot UpPTS Configured as 6: 6: 2 or 6: 7: 1; and / or extended cyclic prefix in the special subframe parameters configured for DwPTS, GP and UpPTS to occupy the number of OFDM symbols than the configuration is 5: 5: 2 or 5: 6: 1; selecting a module, configured to select one or two orthogonal frequency division multiplexing OFDM symbol bearer demodulation in a time domain corresponding to each special subframe scheduling physical resource block according to a configuration parameter of the special subframe configured by the determining module. Reference signal. Preferably, the determining module is further configured to determine that the configuration parameter of the given special subframe is configured as a special subframe parameter in the normal cyclic prefix, and the length of the OFDM symbol occupied by the DwPTS, the GP, and the UpPTS is configured to be 6: 6: 2 or 6: 7: 1; the selection module is further set The OFDM symbol located in the 2nd and 3rd bits or the OFDM symbol of the 3rd and 5th bits or the OFDM symbol of the 2nd and 5th bits is selected to carry the demodulation reference signal. Preferably, the method further includes: a first multiplexing module configured to multiplex ports 7 and 8 when the number of layers to be transmitted is less than or equal to 2, in the i-direction or the direction-division multiplexing mode. Preferably, the method further includes: a second multiplexing module, configured to combine code division multiplexing and frequency division multiplexing in a time domain direction between different ports when the number of layers to be transmitted is greater than 2 and less than or equal to 4 The mode is multiplexed, where port 7 and port 8 are code division multiplexed, port 9 and port 10 are code division multiplexed, and the first group of ports consisting of ports 7 and 8 and the first port consisting of ports 9 and 10. Frequency division multiplexing is used between the two groups of ports. Preferably, the second multiplexing module is further configured to: determine a frequency domain location corresponding to the first group of ports consisting of ports 7, 8 'the frequency domain location corresponding to the second group of ports consisting of ports 9, 10 ^{∞ 2} The relationship includes: ^m 2 ^{= m} i ^{+ 1} or ^: ^ - ¹ . Preferably, the determining module is further configured to: determine that the given special subframe configuration parameter is configured as a special subframe parameter in the extended cyclic prefix, and the number of OFDM symbols occupied by the DwPTS, the GP, and the UpPTS is configured to be 5: 5: 2 or 5: 6: 1; The selection module is further configured to: select an OFDM symbol located at the 2nd or 4th bit or an OFDM symbol of the 2nd and 4th bits for carrying the demodulation reference signal. Preferably, the method further includes: a third multiplexing module, configured to select the OFDM symbol located in the 2nd and 4th bits to carry the demodulation reference signal, and use the code division multiplexing in the time domain direction to port 7 and the port 8 performs code division multiplexing, and maps the multiplexing result on the OFDM symbols located at the 2nd and 4th bits. Preferably, the method further includes: a fourth multiplexing module, configured to perform code division multiplexing on the adjacent two subcarriers by using a frequency domain direction code division multiplexing manner, where The adjacent two subcarriers are separated by one or four subcarriers. In the method provided by the embodiment of the present invention, when the configuration parameters of the special subframe are changed, one or two orthogonal frequency division multiplexing OFDM symbol carriers are selected in the time domain corresponding to each special subframe scheduling physical resource block. The reference signal is multiplexed by CDM (code division multiplexing) and CDM+FDM (code division multiplexing + frequency division multiplexing) multiplexing It may maintain a pattern format compatible with other configurations, the complexity of the descending UE, and the adaptation of special subframes. Set. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram showing the peak loss caused by the inability of the DwPTS to transmit traffic when TD-SCDMA 2: 4 and TD-LTE 1:3 are matched according to the related art; FIG. 2 is a diagram of an embodiment of the present invention. FIG. 3 is a second schematic structural diagram of a DMRS pattern defined in the current R10 according to an embodiment of the present invention; FIG. 4 is a schematic diagram of a second structure of a DMRS pattern defined in the current R10 according to an embodiment of the present invention; A third structural diagram of a DMRS pattern defined in the current R10; FIG. 5 is a fourth structural diagram of a DMRS pattern defined in the current R10 according to an embodiment of the present invention; FIG. 6 is a diagram of an embodiment of the present invention. A fifth structural diagram of a DMRS pattern defined in the current R10; FIG. 7 is a flowchart of processing of a demodulation reference signal carrying method according to an embodiment of the present invention; FIG. 8 is a DwPTS in a special subframe according to an embodiment of the present invention. Demodulation reference signal pattern when configured as 4/5/6 OFDM symbols; FIG. 9 is another demodulation reference signal pattern when the DwPTS is configured as 6 OFDM symbols in the special subframe according to the embodiment of the present invention; Figure 10 is an embodiment of the present invention Schematic diagram of code division multiplexing two demodulation reference signal ports (port 7, port 8) by a length of 2 OCC in the time domain direction; FIG. 11 is a length in the frequency domain direction according to an embodiment of the present invention. A first schematic diagram of a method of code division multiplexing two demodulation reference signal ports (port 7, port 8) by an OCC of 2; FIG. 12 is a second schematic diagram of a method for code division multiplexing two demodulation reference signal ports (port 7, port 8) by a length of 2 OCC in the frequency domain direction according to an embodiment of the present invention; FIG. A third schematic diagram of a method for code division multiplexing two demodulation reference signal ports (port 7, port 8) by a length of 2 OCC in the frequency domain direction according to an embodiment of the present invention; A fourth schematic diagram of a method for code division multiplexing two demodulation reference signal ports (port 7, port 8) by a length of 2 OCC in the frequency domain direction according to an embodiment of the present invention; FIG. 15 is a schematic diagram of the present invention FIG. 16 is a second schematic structural diagram of a demodulation reference signal carrying apparatus according to an embodiment of the present invention; FIG. 17 is a demodulation reference according to an embodiment of the present invention. FIG. 18 is a fourth schematic structural diagram of a demodulation reference signal carrying apparatus according to an embodiment of the present invention; FIG. 19 is a demodulation reference signal carrying apparatus according to an embodiment of the present invention. The fifth structure diagram. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. As mentioned in the related art, when TD-SCDMA 2: 4 matches TD-LTE 1: 3, according to the existing

In the LTE (LTE-A) configuration mode, in order to achieve synchronization of the two systems, the LTE TDD only uses configuration 0 and configuration 5 in Table 1, and the DWPTS only occupies 3 symbols, no The symbol carrying the service signal, the DWPTS in this configuration cannot transmit the service. Compared with the UL/DL configuration of 2:2, although the UL/DL is 1:3, one downlink service subframe data symbol is added, but Due to the matching ratio of special subframes, DWPTS reduces the number of symbols that can be set as data transmission. Therefore, the peak/average throughput has a large loss and the overall efficiency is low. To solve the above technical problem, the embodiment of the present invention provides a solution: In Table 1, different configurations are added for a normal CP (cyclic prefix), for example, adding DwPTS: GP: UpPTS is 6: 6: 2 configuration The requirements, as well as the expansion of the CP, increase the DwPTS: GP: UpPTS is 5: 5: 2, but the current protocol, DMRS (demodulation reference signal), does not consider the increased configuration Support, the DMRS pattern defined in the current R10 is shown in FIG. 2 to FIG. 6, and FIG. 2 is the OFDM of the normal subframe in the existing normal CP. The DMRS pattern of the symbol, FIG. 3 is a DMRS pattern in which the special subframe DwPTS is configured as 11 or 12 OFDM symbols, and FIG. 4 is a DMRS pattern in which the special subframe DwPTS is configured as 11 or 12 OFDM symbols, wherein the left oblique line refers to the port. The position of the reference signal RE corresponding to 7, 8, 11, and 13, the parallel line refers to the position of the reference signal RE corresponding to the ports 9, 10, 12, and 14, and the right oblique line refers to the position of the common reference signal. 5 is a DMRS pattern of a normal subframe when the CP is extended, and FIG. 6 is a DMRS pattern in which the special subframe DwPTS is configured as 8/9/10 OFDM symbols, where the left oblique line refers to the position of the reference signal RE corresponding to the ports 7, 8. The emphasis right slash refers to the position of the common reference signal. When the number of layers is less than or equal to 4, an OCC (orthogonal cover code) of length 2 is used, and when it is greater than 4, an OCC code of length 4 is used; when the number of layers is greater than 4 and less than or equal to 8, 釆Use an OCC of length 4; for an extended CP, the maximum supported number of layers is 2. It can be seen in conjunction with FIG. 2 to FIG. 6 that the current DMRS cannot support the new configuration mode. Based on the solution, the embodiment of the present invention provides a method for carrying a demodulation reference signal. The processing flow is as shown in FIG. 7, and includes: Step 702: In LTE TDD, determining a configuration parameter of a special subframe as a given special a configuration parameter of the subframe, where the configuration parameters of the special subframe include the number of OFDM symbols occupied by the DwPTS, the GP, and the UpPTS; Step 704: Select one or two time domains corresponding to the physical resource blocks of each special subframe scheduling physical resource block The OFDM symbol carries a demodulation reference signal. In the method provided by the embodiment of the present invention, when the configuration parameters of the special subframe are changed, one or two OFDM symbols are selected to be demodulated reference signals in the time domain corresponding to each special subframe scheduling physical resource block, Multiplexing by CDM (code division multiplexing) and CDM+FDM (code division multiplexing + frequency division multiplexing) to maintain the same configuration as possible It has a compatible pattern form, the complexity of the descending UE, and adapts to the configuration of the special subframe. Preferably, in an embodiment, when the configuration parameter of the special subframe is a special subframe of a normal cyclic prefix, the number of OFDM symbols occupied by the DwPTS, the GP, and the UpPTS is configured as 6: 6: 2 or 6: 7: 1 When the OFDM symbol of the 2nd and 3rd bits or the OFDM symbol of the 3rd and 5th bits or the OFDM symbol of the 2nd and 5th bits is selected, the demodulation reference signal corresponding to the same port is selected on the same OFDM symbol. The frequency domain interval is 4 subcarriers. In implementation, when the number of layers transmitted is less than or equal to 2, the code division multiplexing method in the time domain direction is adopted. Port 7 and port 8 are multiplexed; when the number of layers transmitted is greater than 2 and less than or equal to 4, multiplexing between different ports is performed by combining code division multiplexing and frequency division multiplexing in the time domain direction. Port 7 and port 8 are code division multiplexed, and port 9 and port 10 are code division multiplexed, between the first group of ports 7 and 8 and the second group of ports 9 and 10. Using frequency division multiplexing, the relationship between the frequency domain location corresponding to the first group of ports consisting of ports 7 and 8 and the frequency domain location ^∞2 corresponding to the second group of ports consisting of ports 9 and 10 includes: = + 1 Or = _ 1. Preferably, in another embodiment, when the configuration parameter of the special subframe is an extended cyclic prefix special subframe, the length of the OFDM symbol occupied by the DwPTS, the GP, and the UpPTS is configured to be 5:5:2 or 5:6: At 1 o'clock, the OFDM symbol located at the 2nd bit or the OFDM symbol of the 4th bit or the OFDM symbols of the 2nd and 4th bits are selected for carrying the demodulation reference signal. In implementation, when the OFDM symbol 7 on the 2nd and 4th bits is selected to carry the demodulation reference signal, the port 7 and the port 8 are code-multiplexed in a time division manner in the time domain direction, and the multiplexing result is mapped. On the OFDM symbols located on the 2nd and 4th bits. In implementation, the port 7 and the port 8 may be code-multiplexed on the adjacent two subcarriers by using frequency i or direction code division multiplexing, where the interval between adjacent two subcarriers is one. Or 4 subcarriers. The method provided by the embodiments of the present invention is described in more detail and is described in detail in several specific embodiments. In the first embodiment, when the normal cyclic prefix configuration parameter is changed, the demodulation reference signal pattern configuration mode (rankl~4) is used, and FIG. 8 illustrates the demodulation reference signal pattern when the DwPTS is configured as 4/5/6 OFDM symbols in the special subframe. In this mode, the demodulation reference signal is configured on the second and third OFDM symbols of a physical resource block pair, and the same pattern configuration mode is used on each PRB (Physical Resource Block), and the same port phase is used. The adjacent demodulation reference signal has a subcarrier spacing of 4 in the frequency domain. FIG. 9 illustrates another demodulation reference signal pattern when the DwPTS is configured as 6 OFDM symbols in a special subframe, where the demodulation reference signal is configured on the 3rd, 5th OFDM symbols of a physical resource block pair or 2. On the 5 OFDM symbols, the same configuration is used on each PRB, and the subcarrier spacing of the adjacent port demodulation reference signals on the same port is also 4 in the frequency domain. When the number of layers transmitted is less than or equal to 2, the length in the time domain is determined by code division multiplexing. The OCC of 2 multiplexes the demodulation reference signals of the two ports (port 7, port 8). And reversing the OCC code on the adjacent DMRS subcarriers, as shown in FIG. 8 and FIG.

1 1

W a b]

1 -1 When the number of layers transmitted is greater than or equal to 3 and less than or equal to 4, port 7 and port 8 are multiplexed in the time domain direction by code division multiplexing, and code division multiplexed in the time domain direction. The mode multiplexes port 9 and port 10, and the two groups are multiplexed by frequency division. Preferably, in this configuration, transmissions having a number of layers greater than 4 are not supported. Embodiment 2 When the extended cyclic prefix configuration parameter is changed, the demodulation reference signal is located on the 2nd and 4th OFDM symbols, and the subcarrier spacing of the adjacent port adjacent demodulation reference signal in the frequency domain is 2, a preferred configuration. The two demodulation reference signal ports (port 7, port 8) are code-multiplexed by the OCC of length 2 in the time domain direction, as shown in FIG. 10, in this mode, it can be kept with other special sub- Frame configuration has better compatibility. Figures 11 and 12 and Figures 13 and 14 respectively show a method of code division multiplexing two demodulation reference signal ports (port 7, port 8) by a length of 2 OCC in the frequency domain direction. In the manner shown in Figures 11 and 12, the demodulation reference signal occupies one OFDM symbol (on OFDM symbol 2 or OFDM symbol 4), and the interval between adjacent two sets of demodulation reference signals is one subcarrier. In the manner shown in Figures 13 and 14, the demodulation reference signal occupies two OFDM symbols (OFDM symbols 2, 4), and the interval between adjacent two sets of demodulation reference signals on the same OFDM symbol is 4 subcarriers, and The subcarrier positions corresponding to the demodulation reference signals on the two OFDM symbols are position-interleaved, so that the demodulation reference signal distribution in the frequency domain is more uniform. In the manner of Figures 11, 12 and Figures 13 and 14, the high speed UE can be better supported. Based on the same inventive concept, an embodiment of the present invention further provides a demodulation reference signal carrying apparatus. For details, refer to FIG. 15, which includes: a determining module 1501, configured to determine, in an LTE TDD system, a configuration parameter of a special subframe as The configuration parameters of the specific special subframe; wherein, the configuration parameters of the given special subframe include: The special subframe parameter in the normal cyclic prefix is configured as a downlink pilot transmission slot DwPTS, a guard period GP, and an uplink pilot transmission slot. The number of OFDM symbols occupied by UpPTS is 6: 6: 2 or 6:

7: 1; and / or extended cyclic prefix special subframe parameters configured as DwPTS, GP and UpPTS The number of OFDM symbols used is configured to be 5:5:2 or 5:6:1; the selection module 1502 is configured to schedule physical resource blocks corresponding to each special subframe according to the configuration parameters of the special subframe configured by the determining module 1501. One or two orthogonal frequency division multiplexing OFDM symbols are selected on the time domain to carry the demodulation reference signal. In an embodiment, the determining module 1501 may be further configured to determine that the configuration parameter of the given special subframe is the OFDM occupied by the DwPTS, the GP, and the UpPTS in the normal cyclic prefix configured as the special subframe parameter in the normal cyclic prefix. The symbol number length ratio is configured as 6: 6: 2 or 6: 7: 1 ; the selection module 1502 can be further configured to: select the OFDM symbol located in the 2nd and 3rd bits or the 3rd, 5th OFDM symbol or the 2nd, 5th The OFDM symbol of the bit carries the demodulation reference signal. In an embodiment, as shown in FIG. 16, the demodulation reference signal carrying apparatus may further include: a first multiplexing module 1601 configured to perform code division multiplexing in a time domain direction when the number of layers to be transmitted is less than or equal to two The mode multiplexes port 7 and port 8. In an embodiment, as shown in FIG. 17, the demodulation reference signal carrying apparatus may further include: a second multiplexing module 1701 configured to: when the number of layers to be transmitted is greater than 2 and less than or equal to 4, between different ports Multiplexing is performed by combining code division multiplexing and frequency division multiplexing in the time domain direction, wherein port 7 and port 8 are code division multiplexed, and port 9 and port 10 are code division multiplexed by port 7, A frequency division multiplexing is used between the first group of ports formed by 8 and the second group of ports consisting of ports 9, 10. In an embodiment, the second multiplexing module 1701 may be further configured to: determine by port 7,

The relationship between the frequency domain location corresponding to the first group of ports 8 and the frequency domain location 2 corresponding to the second group of ports consisting of ports 9, 10 includes: = ^ + 1 or = ^ _ 1. In an embodiment, the determining module 1501 may be further configured to: determine that the given special subframe configuration parameter is configured as a special subframe parameter in the extended cyclic prefix, and the number of OFDM symbols occupied by the DwPTS, the GP, and the UpPTS is configured to be 5: 5: 2 or 5: 6: 1 ; The selection module 1502 may be further configured to: select an OFDM symbol located at the 2nd bit or an OFDM symbol of the 4th bit or an OFDM symbol of the 2nd and 4th bits for the demodulation reference signal . In an embodiment, as shown in FIG. 18, the demodulation reference signal carrying apparatus may further include: a third multiplexing module 1801 configured to select the OFDM symbol ⁷ located in the 2nd and 4th bits when the demodulation reference signal is received, Port 7 and port 8 are code-multiplexed by code division multiplexing in the time domain direction, and the multiplexing result is mapped on the OFDM symbols located at the 2nd and 4th bits. In an embodiment, as shown in FIG. 19, the demodulation reference signal carrying apparatus may further include: a fourth multiplexing module 1901 configured to use frequency domain direction code division multiplexing on adjacent two subcarriers Port 7 and port 8 are code division multiplexed, wherein adjacent two subcarriers are separated by 1 or 4 subcarriers. From the above description, it can be seen that the present invention achieves the following technical effects: Using the method provided by the embodiment of the present invention, when the configuration parameters of the special subframe are changed, one or two orthogonal frequencies are selected in the time domain. The sub-multiplexed OFDM symbol 7-load demodulation reference signal is multiplexed by CDM and CDM+FDM multiplexing, so as to maintain a pattern compatible with other configurations as much as possible, and the complexity of the UE is adapted to the special sub- Frame added configuration. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A demodulation reference signal carrying method, comprising:

In the time division duplex long-term evolution system LTE TDD, under the configuration parameters of a given special subframe, one or two orthogonal frequency division multiplexing OFDMs are selected in the time domain corresponding to each special subframe scheduling physical resource block. The symbol carries a demodulation reference signal;

The configuration parameters of the given special subframe include: the ratio of the number of OFDM symbols occupied by the special subframe parameters in the normal cyclic prefix to the downlink pilot transmission slot DwPTS, the guard period GP, and the uplink pilot transmission slot UpPTS Configured as 6: 6: 2 or 6: 7: 1; and / or extended cyclic prefix in the special subframe parameters configured as DwPTS, GP and UpPTS occupying a greater number of OFDM symbols than 5: 5: 2 or 5: 6: 1.

2. The method according to claim 1, wherein the one or two orthogonal frequency division multiplexing OFDM symbol-loaded demodulation reference signals are selected in a time domain corresponding to each special subframe scheduling physical resource block, including :

When the special subframe configuration parameter of the given special subframe configuration parameter is configured as DwPTS, GP, and UpPTS, the number of OFDM symbols occupied is 6: 6: 2 or 6: 7: 1 The second or third bit of the OFDM symbol or the third and fifth bits of the OFDM symbol or the second and fifth bits of the OFDM symbol carry the demodulation reference signal.

The method according to claim 2, wherein the demodulation reference signals corresponding to the same port have a frequency domain interval of 4 subcarriers on the same OFDM symbol.

The method according to claim 2 or 3, wherein, when the number of layers to be transmitted is less than or equal to 2, port 7 and port 8 are multiplexed in a code division multiplexing manner in the time domain direction.

The method according to claim 2 or 3, wherein, when the number of layers to be transmitted is greater than 2 and less than or equal to 4, combining code division multiplexing and frequency division multiplexing in a time domain direction between different ports The mode is multiplexed, where port 7 and port 8 are code division multiplexed, port 9 and port 10 are code division multiplexed, and the first group of ports consisting of ports 7 and 8 and the first group consisting of ports 9 and 10. Frequency division multiplexing is used between the two groups of ports.

6. The method according to claim 5, wherein the frequency domain position corresponding to a first set of ports by the port 7, 8 'in which the frequency domain position corresponding to the second set of ports by the port 9, consisting of 10 ^∞2 The relationship includes: = + i or = _ i.

The method of claim 1, wherein the one or two orthogonal frequency division multiplexing OFDM symbol-loaded demodulation reference signals are selected in a time domain corresponding to each special subframe scheduling physical resource block, including :

When the given special subframe configuration parameter is configured as a special subframe parameter of the extended cyclic prefix, the number of OFDM symbols occupied by the DwPTS, the GP, and the UpPTS is configured to be 5:5:2 or 5:6:1, and the selection is located. The 2nd or 4th bit OFDM symbol or the 2nd and 4th bit OFDM symbols are used to carry the demodulation reference signal.

8. The method according to claim 7, wherein when selecting the OFDM symbol located in the 2nd and 4th bits to carry the demodulation reference signal, the method of code division multiplexing in the time domain direction is used for port 7 and Port 8 performs code division multiplexing.

9. The method according to claim 7, wherein the port 7 and the port 8 are code-multiplexed on the adjacent two subcarriers by means of frequency domain direction code division multiplexing, wherein, adjacent The two sets of subcarrier spacing are 1 or 4 subcarriers.

10. A demodulation reference signal carrying device, comprising:

a determining module, configured to determine, in the LTE TDD system, a configuration parameter of the special subframe as a configuration parameter of the given special subframe, where the configuration parameters of the given special subframe include: a special sub-normal prefix The frame parameters are configured such that the downlink pilot transmission slot DwPTS, the guard period GP, and the uplink pilot transmission slot UpPTS occupy an OFDM symbol ratio ratio of 6:6:2 or 6:7:1; and/or an extended cyclic prefix. The special subframe parameters are configured such that the number of OFDM symbols occupied by DwPTS, GP, and UpPTS is 5: 5: 2 or 5: 6: 1;

The selecting module is configured to select one or two orthogonal frequency division multiplexing OFDM symbol bearer demodulation reference signals in a time domain corresponding to each special subframe scheduling physical resource block according to a configuration parameter of the special subframe configured by the determining module. .

11. The apparatus according to claim 10, wherein the determining module is further configured to determine that a configuration parameter of the given special subframe is configured for a special subframe parameter in a normal cyclic prefix to be occupied by DwPTS, GP, and UpPTS. The OFDM symbol number length ratio is configured to be 6: 6: 2 or 6: 7: 1; The selection module is further configured to: select the OFDM symbol located in the 2nd and 3rd bits or the OFDM symbol of the 3rd, 5th bit or the OFDM symbol of the 2nd and 5th bits to carry the demodulation reference signal.

12. The device according to claim 11, further comprising:

The first multiplexing module is configured to multiplex port 7 and port 8 in a code division multiplexing manner in a time domain direction when the number of layers to be transmitted is less than or equal to 2.

13. The device according to claim 11, further comprising:

The second multiplexing module is configured to: when the number of layers to be transmitted is greater than 2 and less than or equal to 4, multiplexing between different ports by combining code division multiplexing and frequency division multiplexing in a time domain direction, where Port 7 and port 8 are code division multiplexed, port 9 and port 10 are code division multiplexed, and the first group of ports consisting of ports 7 and 8 and the second group of ports 9 and 10 are used. Frequency division multiplexing.

14. The apparatus according to claim 13, wherein the second multiplexing module is further configured to: determine a frequency i or a location 'corresponding to a first group of ports consisting of ports 7, 8 and a number consisting of ports 9, 10 The relationship of the frequency domain position ^∞2 corresponding to the two groups of ports includes: ^{∞2 =} i ^{+ 1} or w ₂ = w, - 1

The device according to claim 10, wherein the determining module is further configured to: determine that the given special subframe configuration parameter is configured as a special subframe parameter in the extended cyclic prefix, which is occupied by DwPTS, GP, and UpPTS. The OFDM symbol number length ratio is configured to be 5:5:2 or 5:6:1;

The selection module is further configured to: select an OFDM symbol located at the 2nd or 4th bit or an OFDM symbol of the 2nd and 4th bits for carrying the demodulation reference signal.

16. The device according to claim 15, further comprising:

a third multiplexing module, configured to select, when the OFDM symbols located in the second and fourth bits carry the demodulation reference signal, perform code division multiplexing on the port 7 and the port 8 in a manner of code division multiplexing in a time domain direction, The multiplexing result is mapped on the OFDM symbols located at the 2nd and 4th bits.

7. The device according to claim 15, further comprising:

The fourth multiplexing module is configured to perform code division multiplexing on the adjacent two subcarriers in the frequency domain direction code division multiplexing manner, where the adjacent two subcarrier spacings It is 1 or 4 subcarriers.