CN103517345A

CN103517345A - Downlink UE-specific DM-RS transmission method, UE and network-side device

Info

Publication number: CN103517345A
Application number: CN201210216400.7A
Authority: CN
Inventors: 高雪娟; 丁昱
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2012-06-26
Filing date: 2012-06-26
Publication date: 2014-01-15
Anticipated expiration: 2032-06-26
Also published as: WO2014000618A1; CN103517345B

Abstract

The invention discloses a downlink UE-specific DM-RS transmission method, UE and a network-side device. The method comprises: according to a pre-appointment of the UE and a network side, or according to configuration information sent by the network side, determining a DM-RS resource mapping manner used by a downlink channel, the DM-RS resource mapping manner comprising a first class DM-RS resource mapping manner and a second class DM-RS resource mapping manner, the first class DM-RS resource mapping manner being a DM-RS resource mapping manner defined in a long term evolution-advanced (LTE-A) Rel-10 system, and the second class DM-RS resource mapping manner being a mapping manner having reduced DM-RS occupied resources relative to the first class DM-RS resource mapping manner; and in a transmission resource of the downlink channel, acquiring DM-RS information according to the determined DM-RS resource mapping manner. According to the present invention, the DM-RS transmission overheads can be reduced, and the throughput can be improved.

Description

Dedicated DM-RS transmission method for downlink user, UE and network side device

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method and a UE for transmitting a DM-RS dedicated for a downlink user, and a network side device.

Background

1) CA introduction in LTE-A

In order to meet the peak rate requirement in an LTE-a (Long Term Evolution-advanced) system, a Carrier Aggregation (CA) technology is introduced, that is, a plurality of continuous or discontinuous carriers under the same base station eNB are aggregated together to serve the UE, as shown in fig. 1. These aggregated carriers are also called Component Carriers (CCs). The carrier used by each Cell may be a component carrier. To ensure backward compatibility with LTE systems, each component carrier does not exceed 20 MHz.

2) DM-RS introduction in LTE-A systems

In the LTE-A system, 9 downlink transmission modes are defined, and the specific downlink transmission mode of the UE is pre-configured by a high-level signaling. The Downlink user-specific demodulation reference Signal DM-RS (UE-specific demodulation reference Signal) is used for Signal demodulation in transmission modes 7 to 9, and may support transmission through 1 to 8 antenna ports, and is respectively configured at antenna ports p-5, p-7, p-8 or p-7, 8.

The DM-RS is only transmitted on PRBs (Physical Resource blocks) transmitted by adopting transmission modes 7-9, so that the overhead of reference symbols is reduced, energy is saved, and the interference between adjacent cells is reduced. As shown in fig. 2a to 2c, the Resource mapping method of a DM-RS on one PRB (physical Resource Block) in each slot included in one subframe is shown, in the drawing, a time domain Resource is shown horizontally, an OFDM (Orthogonal Frequency Division Multiplexing) symbol is used as a unit, l is an OFDM symbol number in different slots in one subframe, a Frequency domain Resource is shown vertically, k is a subcarrier number, and each cell jointly determined by one l and k number represents one RE (Resource Element), where, for the same subframe, the mapping positions of DM-RS on an antenna port 7/8/11/13 are the same, and the mapping positions on an antenna port 9/10/12/14 are the same. Orthogonality between antenna ports using the same resource mapping scheme is guaranteed by orthogonal sequences shown in tables 1 and 2. As shown in FIG. 2c, under the extended CP, DM-RS does not support transmission at antenna ports 9-14.

In the Rel-10 system, in PRBs (e.g., 6 PRBs in the middle of a Cell band) in which DM-RS and PBCH (Physical Broadcast Channel) data or synchronization signals have resource overlap in the same subframe, the DM-RS is not transmitted, and thus PDSCH in these PRBs cannot be demodulated based on DM-RS, but can be demodulated based on CRS (Cell-specific Reference Signal).

Table 1: DM-RS orthogonal sequences of different antenna ports under normal CP

Table 2: DM-RS orthogonal sequences of different antenna ports under extended CP

3) Extension carrier introduction in LTE-A systems

In order to further improve the utilization rate of system resources, LTE-ARel-11 determines that for the CA system, a New Carrier Type (NCT) is introduced to enhance the utilization rate of the system spectrum, better support heterogeneous networks, and reduce power consumption.

The specific working mode of NCT is as follows: CRS overhead is reduced, CRS transmission with 5ms as a period on an antenna port 0 is only supported, and the CRS is only used for tracking and measuring; an Enhanced Physical Downlink Control CHannel (E-PDCCH) is adopted to schedule the PDSCH transmission; downlink data (including E-PDCCH and PDSCH) are demodulated based on DM-RS, and only a transmission mode 9 is supported; in Rel-11, NCT can not work independently and needs to work with a legacy (legacy) carrier aggregation; dividing the receiving end into synchronous and asynchronous NCTs according to whether a certain deviation exists between the NCTs at the receiving end and the synchronous adjustment of the legacy carrier waves in the time domain and the frequency domain; synchronous signals need to be transmitted on the asynchronous NCT, and time-frequency domain resources transmitted by the synchronous signals need not to be overlapped with resources of downlink reference signals such as CRS, DM-RS, CSI-RS (Channel State information reference Signal) and the like, so that the downlink transmission efficiency of the NCT is improved; furthermore, in Rel-12 and subsequent releases, NCT may support independent work.

4) Introduction to LTE-Hi

The Indoor (Indor)/hot spot area (hotspot) and other scenes have the characteristics of low-speed mobile terminal orientation, small multipath delay spread, small coverage radius and the like. The small cell deployed in Indor/hotspot and other scenes or the local cell may work independently or jointly/cooperatively with a macro cell.

To meet the rapidly increasing data traffic demand in the Indoor/Hotspot scenario, further studies on LTE-hi (LTE for Hotspot and Indoor) were proposed. LTE-Hi is based on LTE and LTE-a systems, and can achieve higher spectral efficiency and throughput by extending bandwidth, for example, using higher-band frequency band resources, or using new physical layer transmission techniques, such as NCT, Dynamic time Division Duplex (Dynamic TDD) technique, 256 Quadrature Amplitude Modulation (QAM), and the like.

In addition, the NCT is used as a new carrier type different from legacy carriers, and can further introduce a design scheme for reducing the overhead and improving the spectrum efficiency. The Dynamic TDD technology can dynamically configure the transmission direction of partial subframes according to the current service requirement so as to better adapt to scenes such as Indor/hotspot and the like with asymmetric uplink/downlink service volume.

The UE in the Indor/hotspot scene is mostly in a low-speed state, the channel correlation among a plurality of OFDM symbols in one subframe and among adjacent subframes is higher, the resource overhead of DM-RS on a time domain can be reduced under the premise of not influencing the demodulation performance of the UE, and the throughput is improved; similarly, when the frequency domain channel correlation of the frequency bands used in the scenes such as Indor/hotspot is higher, the resource overhead of the DM-RS on the frequency domain can be reduced, and the throughput is improved. But at present, no DM-RS transmission method for reducing overhead based on Indor/hotspot scene characteristics exists.

Disclosure of Invention

The invention provides a dedicated DM-RS transmission method for a downlink user, UE (user equipment) and a network side device, which are used for reducing the DM-RS transmission overhead of an Indor/hotspot scene and improving the throughput.

The invention provides a method for transmitting a demodulation reference signal DM-RS special for a downlink user, which comprises the following steps:

determining a DM-RS resource mapping mode adopted by a downlink channel according to the prearrangement of User Equipment (UE) and a network side or according to configuration information sent by the network side, wherein the DM-RS resource mapping mode is divided into a first type DM-RS resource mapping mode and a second type DM-RS resource mapping mode, the first type DM-RS resource mapping mode is a DM-RS resource mapping mode defined in a long term evolution enhanced long term evolution-advanced (LTE-A) Rel-10 system, and the second type DM-RS resource mapping mode is a mapping mode which occupies less resources compared with the DM-RS resource mapping mode of the first type DM-RS;

and acquiring DM-RS information in the transmission resources of the downlink channel according to the determined DM-RS resource mapping mode.

The invention also provides a method for transmitting the demodulation reference signal DM-RS special for the downlink user, which comprises the following steps:

determining a DM-RS resource mapping mode adopted by a downlink channel, wherein the DM-RS resource mapping mode is divided into a first DM-RS resource mapping mode and a second DM-RS resource mapping mode, the first DM-RS resource mapping mode is a DM-RS resource mapping mode defined in a long term evolution enhanced LTE-A Rel-10 system, and the second DM-RS resource mapping mode is a mapping mode which occupies less resources compared with the DM-RS resource mapping mode of the first DM-RS resource mapping mode;

and in the transmission resources of the downlink channel, performing DM-RS resource mapping and transmission according to the determined DM-RS resource mapping mode.

The present invention also provides a UE, including:

a determining unit, configured to determine, according to a predetermined agreement between the UE and a network side or according to configuration information sent by the network side, a DM-RS resource mapping manner adopted by a downlink channel, where the DM-RS resource mapping manner is divided into a first type DM-RS resource mapping manner and a second type DM-RS resource mapping manner, the first type DM-RS resource mapping manner is a DM-RS resource mapping manner defined in a long term evolution enhanced LTE-a Rel-10 system, and the second type DM-RS resource mapping manner is a mapping manner in which a DM-RS occupies a reduced resource compared to the first type DM-RS resource mapping manner;

and the acquisition unit is used for acquiring the DM-RS information in the transmission resources of the downlink channel according to the determined DM-RS resource mapping mode.

The present invention also provides a network side device, including:

a determining unit, configured to determine a DM-RS resource mapping manner used by a downlink channel, where the DM-RS resource mapping manner is divided into a first type DM-RS resource mapping manner and a second type DM-RS resource mapping manner, the first type DM-RS resource mapping manner is a DM-RS resource mapping manner defined in a long term evolution-enhanced LTE-a Rel-10 system, and the second type DM-RS resource mapping manner is a mapping manner in which a DM-RS occupied resource is reduced relative to the first type DM-RS resource mapping manner;

and the transmission unit is used for carrying out DM-RS resource mapping and transmission in the transmission resources of the downlink channel according to the determined DM-RS resource mapping mode.

The special DM-RS transmission method for the downlink user, the UE and the network side device have the following beneficial effects that: when the DM-RS transmission method special for the downlink user, the UE and the network side device provided by the invention are applied to an Indor/hotspot scene, the DM-RS transmission overhead can be reduced, and the throughput is improved.

Drawings

Fig. 1 is a schematic view of carrier aggregation in a conventional LTE-a system;

fig. 2a is a DM-RS resource map on antenna ports 7 and 8 under the conventional CP;

fig. 2b is a DM-RS resource map on antenna ports 9 and 10 under the conventional CP;

fig. 2c is a DM-RS resource map on antenna ports 7 and 8 under the existing extended CP;

FIG. 3 is a flowchart illustrating a method for transmitting a dedicated DM-RS for a downlink user on a network side according to an embodiment of the present invention;

fig. 4 is a flowchart of a method for transmitting a DM-RS dedicated for a downlink user at a terminal side according to an embodiment of the present invention;

fig. 5a is a schematic diagram of a time domain truncated DM-RS resource mapping manner of a conventional downlink subframe under a conventional CP in an embodiment of the present invention;

fig. 5b is a schematic diagram of a time domain truncated DM-RS resource mapping method of a conventional downlink subframe under an extended CP in the embodiment of the present invention;

fig. 6a is a schematic diagram of a time domain truncated DM-RS resource mapping manner of a conventional downlink subframe under a conventional CP in an embodiment of the present invention;

FIG. 6b is a diagram of a time domain truncated DM-RS resource mapping mode II of a conventional downlink subframe under an extended CP according to an embodiment of the present invention;

fig. 7a and 7b are schematic diagrams illustrating a time domain truncated DM-RS resource mapping method of a TDD special subframe under a conventional CP according to an embodiment of the present invention;

fig. 8a, fig. 8b, fig. 8c, and fig. 8d are schematic diagrams illustrating a frequency domain truncated DM-RS resource mapping method of a conventional downlink subframe under an extended CP according to an embodiment of the present invention;

FIG. 9 is a diagram of a UE architecture in an embodiment of the present invention;

fig. 10 is a diagram illustrating a structure of a network-side device according to an embodiment of the present invention.

Detailed Description

The following describes the downlink user dedicated DM-RS transmission method, UE, and network side apparatus provided in the present invention in more detail with reference to the accompanying drawings and embodiments.

In existing mobile communication systems, about 70% of mobile data traffic comes from Indoor (Indoor) or hot spot areas (Hotspots), and in the coming years, Indoor/Hotspots will occupy 90% of the total mobile data traffic. To accommodate the rapidly increasing data traffic demands in these scenarios, further research is needed to improve the spectral efficiency and throughput.

The UE in the Indor/hotspot scene is mostly in a low-speed state, the channel correlation among a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in one subframe and among adjacent subframes is higher, the resource overhead of the DM-RS on the time domain can be reduced under the premise of not influencing the demodulation performance of the UE, and the throughput is improved; similarly, when the frequency domain channel correlation of the frequency bands used in the scenes such as Indor/hotspot is higher, the resource overhead of the DM-RS on the frequency domain can be reduced, and the throughput is improved. At present, no low-overhead DM-RS transmission method based on Indor/hotspot scene characteristics exists.

The invention provides a DM-RS transmission method, which aims to reduce the system overhead of an Indor/hotspot scene and improve the throughput.

As shown in fig. 3, for the network side, the method for transmitting the downlink user dedicated demodulation reference signal DM-RS includes:

step 301, determining a DM-RS resource mapping mode adopted by a downlink channel, where the DM-RS resource mapping mode is divided into a first type DM-RS resource mapping mode and a second type DM-RS resource mapping mode, the first type DM-RS resource mapping mode is a DM-RS resource mapping mode defined in a long term evolution-enhanced LTE-a Rel-10 system, and the second type DM-RS resource mapping mode is a mapping mode in which the DM-RS occupied resources are reduced relative to the first type DM-RS resource mapping mode;

for a downlink channel, available DM-RS resource mapping modes comprise two types, the first type of DM-RS resource mapping mode is a legacy DM-RS resource mapping mode, namely a resource mapping mode defined for each DM-RS antenna port in an LTE-A Rel-10 system, and the second type of DM-RS resource mapping mode reduces DM-RS transmission overhead compared with the first type of DM-RS resource mapping mode.

Step 302, in the transmission resource of the downlink channel, performing DM-RS resource mapping and transmission according to the determined DM-RS resource mapping manner.

The transmission resources of the downlink Channel include time domain resources and frequency domain resources occupied by the downlink Channel transmission, the time domain resources are subframes/time slots/OFDM symbols and the like occupied by the downlink Channel, the frequency domain resources are physical Resource blocks PRB corresponding to subcarriers/subcarriers occupied by the downlink Channel, and for the E-PDCCH, the transmission resources may further include an E-CCE (Enhanced Control Channel Element) or an E-REG (Enhanced Resource Element Group).

Preferably, the network side determines the DM-RS resource mapping method used by the downlink channel, and may adopt any one of the following methods:

in the first mode, determining a DM-RS resource mapping mode used by a downlink channel according to a transmission condition and/or a transmission requirement, further includes: sending configuration information for indicating a DM-RS resource mapping mode to User Equipment (UE);

and in the second mode, according to the prearrangement between the network side and the User Equipment (UE), the DM-RS resource mapping mode adopted by the downlink channel is determined, and the configuration information does not need to be sent to the UE.

And the network side performs DM-RS resource mapping and transmission according to the determined DM-RS resource mapping mode and simultaneously transmits information demodulated based on the DM-RS. Different downlink channels adopt the DM-RS resource mapping method used by the downlink channel to perform resource mapping in the transmission resources of the downlink channel, and map the data information carried by the downlink channel on the REs except the REs occupied by the DM-RS in the transmission resources.

For the terminal side, as shown in fig. 4, the method for transmitting the downlink user dedicated demodulation reference signal DM-RS includes:

step 401, determining a DM-RS resource mapping mode adopted by a downlink channel according to a pre-agreement between User Equipment (UE) and a network side or according to configuration information sent by the network side, where the DM-RS resource mapping mode is divided into a first type DM-RS resource mapping mode and a second type DM-RS resource mapping mode, the first type DM-RS resource mapping mode is a DM-RS resource mapping mode defined in a long term evolution enhanced long term evolution-advanced-LTE-a Rel-10 system, and the second type DM-RS resource mapping mode is a mapping mode in which DM-RS occupies a reduced resource compared to the first type DM-RS resource mapping mode;

step 402, in the transmission resource of the downlink channel, obtaining the DM-RS information according to the determined DM-RS resource mapping mode, thereby demodulating the information carried in the downlink channel based on the DM-RS information.

The available DM-RS resource mapping manners of this embodiment include two types, and the first type DM-RS resource mapping manner is not uniformly adopted as in the prior art, and when the downlink user dedicated DM-RS transmission method is applied to a specific scene, for example, an Indoor/hotspot and other scenes, transmission overhead can be reduced and throughput can be improved.

When the embodiment of the invention is applied to an Indor/hotspot scene, the base station and the UE can work independently in a small cell or a local cell, or work jointly/cooperatively with a macro cell.

The method can work according to an NCT carrier mode for small cells or local cells.

For the network side, when the DM-RS resource mapping method adopted by the downlink channel is determined in the first method, any one of the following determination methods is preferably adopted:

1) and determining that all downlink channels of the UE adopt a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode.

Further comprising: and the network side sends configuration information used for indicating the determined DM-RS resource mapping mode to the UE.

Specifically, when all downlink channels of the UE satisfy the transmission condition and/or the transmission requirement, it is determined that all downlink channels use the second type DM-RS resource mapping manner, otherwise, it is determined that all downlink channels use the first type DM-RS resource mapping manner, and configuration information for indicating the determined DM-RS resource mapping manner is sent to the UE, for example, states "0" and "1" of 1-bit information in the configuration information respectively indicate the first type DM-RS resource mapping manner and the second type DM-RS resource mapping manner.

Correspondingly, for the UE side: and the UE determines that all downlink channels of the UE adopt the DM-RS resource mapping mode according to the configuration information.

2) For each downlink channel, determining that the downlink channel adopts a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode, or determining that the downlink channel adopts one type DM-RS resource mapping mode of the two types DM-RS resource mapping modes in a subframe and/or a physical resource block PRB meeting conditions, or else, adopting another type DM-RS resource mapping mode; the subframe and/or the PRB meeting the condition are determined by a network side and are notified to the UE through configuration information corresponding to the downlink channel in the configuration information, or are determined according to a predetermined agreement between the network side and the UE.

Further comprising: and the network side sends configuration information to the UE, wherein the configuration information contains configuration information which independently indicates DM-RS resource mapping modes adopted by different downlink channels.

Specifically, for each downlink channel, when the downlink channel meets the transmission condition and/or the transmission requirement, determining that the downlink channel uses the second type of DM-RS resource mapping mode, otherwise, using the first type of DM-RS resource mapping mode, and sending configuration information for indicating the DM-RS resource mapping mode to the UE, wherein the configuration information comprises configuration information for independently indicating the DM-RS resource mapping modes adopted by different downlink channels; for example, the configuration information includes 1-bit configuration information of each downlink channel, and the states "0" and "1" of the 1-bit configuration information respectively indicate that the downlink channel adopts the first-type or second-type DM-RS resource mapping manner; for example, suppose that the UE has 3 channels, i.e., E-PDCCH, PBCH, and PDSCH, each bit in the 3-bit information indicates a DM-RS resource mapping manner of each channel, or, for example, it is agreed that "0" indicates that a first type of DM-RS resource mapping manner is adopted, "1" indicates that a second type of DM-RS resource mapping manner is adopted, the configuration information "001" may indicate that the E-PDCCH adopts the first type of DM-RS resource mapping manner, the PBCH adopts the first type of DM-RS resource mapping manner, and the PDSCH adopts the second type of DM-RS resource mapping manner; or,

different downlink channels may use different DM-RS resource mapping manners under different conditions, that is: case 1: when a downlink channel meets the transmission condition and/or the transmission requirement, determining that the downlink channel uses a second type DM-RS resource mapping mode in any transmission subframe, otherwise, using a first type DM-RS resource mapping mode; case 2: when a downlink channel meets the transmission condition and/or the transmission requirement in a specific subframe and/or PRB, determining that the downlink channel uses a second type of DM-RS resource mapping mode in the specific subframe and/or PRB, otherwise, using the first type of DM-RS resource mapping mode, and sending configuration information for indicating the DM-RS resource mapping mode to UE, wherein the configuration information comprises configuration information for independently indicating the DM-RS resource mapping modes adopted by different downlink channels; for example, for the downlink channel in case 1, the configuration information includes 1-bit configuration information of each downlink channel, the "0" and "1" states of the 1-bit information respectively indicate that the downlink channel adopts the first-type or second-type DM-RS resource mapping manner, for the downlink channel in case 2, the configuration information includes a-bit configuration information of each downlink channel, the a-bit information is used to indicate a specific subframe and/or PRB resource, e.g. directly indicating a specific subframe number and/or PRB number, or, the a-bit information indicates information for determining a specific subframe and/or PRB resources, for example, indicates one subframe period S and one subframe offset, determines a subframe in which a subframe number n satisfies (n-offset) modS =0 as the specific subframe, indicates one PRB set, which is one of a plurality of PRB sets predefined by the system; the DM-RS resource mapping manner used in the specific subframe and/or the PRB resource indicated by the a-bit information may be pre-agreed, for example, a second type DM-RS resource mapping manner is pre-agreed, or the a-bit information includes 1-bit information for indicating that the specific subframe and/or the PRB resource uses a first type or a second type DM-RS resource mapping manner.

Correspondingly, for the UE side: and the UE determines that the downlink channel adopts a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode according to the configuration information corresponding to each downlink channel, or determines that the downlink channel adopts one type DM-RS resource mapping mode of the two types DM-RS resource mapping modes in a subframe and/or PRB meeting the conditions, otherwise, adopts another type DM-RS resource mapping mode, and the subframe and/or PRB meeting the conditions is determined according to the configuration information corresponding to the downlink channel in the configuration information or is determined according to the preset agreement between the UE and the network side.

3) Determining that a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode is adopted by a Physical Downlink Shared Channel (PDSCH); or, determining that the PDSCH adopts one of the two DM-RS resource mapping modes in the subframe and/or PRB meeting the condition, otherwise, adopting another DM-RS resource mapping mode, wherein the subframe and/or PRB meeting the condition is determined by the network side and is notified to the UE through the configuration information or is determined according to the preset agreement between the network side and the UE.

Further comprising: and the network side sends configuration information to the UE, wherein the configuration information only indicates the DM-RS resource mapping mode adopted by the PDSCH.

Specifically, for the PDSCH, when a transmission condition and/or a transmission requirement are met, the PDSCH is determined to use a second type DM-RS resource mapping mode, otherwise, the first type DM-RS resource mapping mode is used, and configuration information used for indicating the DM-RS resource mapping mode is sent to the UE, wherein the configuration information comprises configuration information indicating the DM-RS resource mapping mode of the PDSCH; for example, the "0" and "1" states of 1-bit information in the configuration information respectively indicate that the PDSCH adopts the first-type or second-type DM-RS resource mapping manner; or,

for the PDSCH, when the transmission condition and/or the transmission requirement are met in a specific subframe and/or PRB, determining that the PDSCH uses a second type of DM-RS resource mapping mode in the specific subframe and/or PRB, otherwise, using the first type of DM-RS resource mapping mode, and sending configuration information for indicating the DM-RS resource mapping mode to the UE; for example, the a-bit configuration information in the configuration information indicates a specific subframe and/or PRB resource, e.g., directly indicates a specific subframe number and/or PRB number, or the a-bit information indicates information for determining a specific subframe and/or PRB resource, e.g., indicates one subframe period S and one subframe offset, determines a subframe with a subframe number n satisfying (n-offset) modS =0 as a specific subframe, indicates one PRB set, which is one of a plurality of PRB sets predefined by the system; the DM-RS resource mapping manner used in the specific subframe and/or the PRB resource indicated by the a-bit information may be pre-agreed, for example, a second type DM-RS resource mapping manner is pre-agreed, or the a-bit information includes 1-bit information for indicating that the specific subframe and/or the PRB resource uses a first type or a second type DM-RS resource mapping manner.

Correspondingly, for the UE side: the UE determines that the PDSCH adopts a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode according to the configuration information corresponding to the PDSCH; or, determining that the PDSCH adopts one of the two DM-RS resource mapping modes in the subframe and/or PRB meeting the condition, otherwise, adopting another DM-RS resource mapping mode, wherein the subframe and/or PRB meeting the condition is determined according to the configuration information or is determined according to the predetermined agreement between the UE and the network side.

For the first mode, the network side sends the configuration information to the UE through at least one of a physical downlink control channel PDCCH signaling, an enhanced physical downlink control channel E-PDCCH signaling, a media access control MAC signaling, and a radio resource control RRC signaling. Correspondingly, the UE receives the configuration information through at least 1 signaling in PDCCH signaling, E-PDCCH signaling, media access control MAC signaling and radio resource control RRC signaling.

For the second mode, the network side and the UE agree in advance on the same DM-RS resource mapping mode, and for the network side and the UE, the DM-RS resource mapping mode adopted by the downlink channel is determined, which may specifically adopt any one of the following or a combination of any several determination modes:

1) determining that the E-PDCCH adopts a first-type DM-RS resource mapping mode;

2) determining a physical broadcast channel PBCH (if the PBCH exists in a cell deployed as an independently working NCT) and adopting a first type DM-RS resource mapping mode;

3) and determining that the PDSCH adopts a second type DM-RS resource mapping mode in all transmission subframes of the PDSCH, or adopts one type DM-RS resource mapping mode of the two types DM-RS resource mapping modes in the transmission subframes and/or PRBs meeting set conditions, or else adopts another type DM-RS resource mapping mode.

The method 3) determines that the PDSCH is in a transmission subframe and/or PRB meeting the set conditions, and uses one of the two DM-RS resource mapping methods, otherwise, uses another DM-RS resource mapping method, and may specifically use any one or any combination of the following preferred embodiments:

determining that a second type of DM-RS resource mapping mode is adopted in a transmission subframe of which the subframe number n meets (n-offset 1) mod S1=0, and a first type of DM-RS resource mapping mode is adopted in other transmission subframes of the PDSCH;

or determining that the PDSCH adopts a first type DM-RS resource mapping mode in a transmission subframe with the subframe number n satisfying (n-offset 1) mod S1=0, and the PDSCH adopts a second type DM-RS resource mapping mode in other transmission subframes;

wherein, S1 is a predetermined or configured period value of the higher layer signaling, and offset1 is a predetermined or configured subframe number offset value of the higher layer signaling.

Determining that the PDSCH adopts a first type DM-RS resource mapping mode in a time division duplex TDD special subframe, and determining that the PDSCH adopts a second type DM-RS resource mapping mode in other transmission subframes;

or determining that the PDSCH adopts a first type DM-RS resource mapping mode in a TDD special subframe using a normal cyclic prefix CP, and determining that the PDSCH adopts a second type DM-RS resource mapping mode in other transmission subframes;

or determining that the PDSCH adopts a first type DM-RS resource mapping mode in the TDD special subframe using the extended CP, and determining that the PDSCH adopts a second type DM-RS resource mapping mode in other transmission subframes.

Thirdly, determining that the PDSCH adopts a first DM-RS resource mapping mode in a PDSCH transmission subframe containing PBCH and/or synchronous signal transmission, and the PDSCH adopts a second DM-RS resource mapping mode in other transmission subframes; or,

determining that a first type DM-RS resource mapping mode is adopted by a PDSCH in a PDSCH transmission subframe containing PBCH and/or synchronous signal transmission and only in PRBs containing PBCH and/or synchronous signal transmission in a PRB set where the PDSCH is transmitted, and a second type DM-RS resource mapping mode is adopted by the PDSCH in the rest PRBs or in a PDSCH transmission subframe not containing PBCH and/or synchronous signal transmission in the PRB set where the PDSCH is transmitted; or,

determining that the PDSCH is in a PDSCH transmission subframe containing PBCH and/or synchronous signal transmission, when a PRB set in which the PDSCH is transmitted contains PRBs in which the PBCH and/or synchronous signal transmission is located, adopting a first type of DM-RS resource mapping mode, and when the PRB set in which the PDSCH is transmitted does not contain the PRBs in which the PBCH and/or synchronous signal transmission is located or in the PDSCH transmission subframe in which the PBCH and/or synchronous signal transmission is not contained, adopting a second type of DM-RS resource mapping mode (namely adopting the type of DM-RS resource mapping mode on all PRBs in the PRB set in which the PDSCH is transmitted).

And fourthly, determining that the PDSCH adopts a first type DM-RS resource mapping mode in the retransmission subframe of the PDSCH, and adopts a second type DM-RS resource mapping mode in the initial transmission subframe of the PDSCH.

4) And determining that a first type DM-RS resource mapping mode is adopted by the PDSCH in the PDSCH transmission subframe on the macro cell.

Specifically, the 4 modes of the above modes 1) to 4) and a plurality of sub-modes in each mode can function independently; can also be used in any combination, namely: combining the conditions of one type of DM-RS resource mapping mode in the plurality of modes and the sub-modes, determining that the PDSCH meeting the combination condition (namely meeting the condition in any 1 mode in the plurality of modes and the sub-modes of combination) adopts the DM-RS resource mapping mode, and otherwise, adopting another type of DM-RS resource mapping mode; specifically, the following cases may be included but not limited to:

determining a PDSCH transmitted in a subframe with a subframe number n satisfying (n-offset 1) mod s1=0, and/or a PDSCH transmitted in a time division duplex TDD special subframe (or a specific special subframe, such as a special subframe using a normal CP, or a special subframe using an extended CP, or a special subframe having a specific special subframe configuration), and/or a PDSCH transmitted in a subframe containing a PBCH and/or a synchronization signal transmission, and/or a PDSCH for retransmission, and/or a PDSCH transmitted on a macro cell, using a first type DM-RS resource mapping manner, and in other cases, using a second type DM-RS resource mapping manner; or,

determining a PDSCH transmitted in a transmission subframe with a subframe number n satisfying (n-offset 1) mod s1 ═ 0, and/or a PDSCH transmitted in a time division duplex TDD special subframe (or a specific special subframe, such as a special subframe using a normal CP, or a special subframe using an extended CP, or a special subframe having a specific special subframe configuration), and/or a PDSCH transmitted in a partial PRB including PBCH and/or synchronization signal transmission in a PRB set in which the PDSCH is transmitted, and/or a retransmitted PDSCH, and/or a PDSCH transmitted on a macro cell, and using a first type DM-RS resource mapping manner, and in other cases, using a second type DM-RS resource mapping manner; or,

determining a PDSCH transmitted in a transmission subframe with a subframe number n satisfying (n-offset 1) mod s1 ═ 0, and/or a PDSCH transmitted in a time division duplex TDD special subframe (or a specific special subframe, for example, a special subframe using a normal CP, or a special subframe using an extended CP, or a special subframe having a specific special subframe configuration), and/or a PDSCH including a PBCH and/or a synchronization signal transmission in a PRB set in which the PDSCH is transmitted, and/or a PDSCH for retransmission, and/or a PDSCH transmitted on a macro cell, and using a first type DM-RS resource mapping manner, and in other cases, using a second type DM-RS resource mapping manner; or,

determining a PDSCH transmitted in a transmission subframe with a subframe number n not satisfying (n-offset 1) mod s1=0, and/or a PDSCH transmitted in a time division duplex TDD special subframe (or a specific special subframe, e.g., a special subframe using a normal CP, or a special subframe using an extended CP, or a special subframe having a specific special subframe configuration), and/or a PDSCH transmitted in a subframe containing a PBCH and/or a synchronization signal transmission, and/or a PDSCH retransmitted, and/or a PDSCH transmitted on a macrocell, using a first type of DM-RS resource mapping manner, and in other cases, using a second type of DM-RS resource mapping manner; or,

determining a PDSCH transmitted in a transmission subframe with a subframe number n not satisfying (n-offset 1) mod s1 ═ 0, and/or a PDSCH transmitted in a time division duplex TDD special subframe (or a specific special subframe, such as a special subframe using a normal CP, or a special subframe using an extended CP, or a special subframe having a specific special subframe configuration), and/or a PDSCH transmitted in a partial PRB including a PBCH and/or a synchronization signal transmission in a PRB set in which the PDSCH is transmitted, and/or a retransmitted PDSCH, and/or a PDSCH transmitted on a macro cell, and using a first type DM-RS resource mapping manner, and in other cases, using a second type DM-RS resource mapping manner; or,

determining a PDSCH transmitted in a transmission subframe with a subframe number n not satisfying (n-offset 1) mod s1=0, and/or a PDSCH transmitted in a time division duplex TDD special subframe (or a specific special subframe, for example, a special subframe using a normal CP, or a special subframe using an extended CP, or a special subframe having a specific special subframe configuration), and/or a PDSCH including a PBCH and/or a synchronization signal transmission in a PRB set in which the PDSCH is transmitted, and/or a retransmitted PDSCH, and/or a PDSCH transmitted on a macro cell, and using a first type of DM-RS resource mapping manner, and in other cases, using a second type of DM-RS resource mapping manner;

in the above combination cases, S1 is a period value predetermined or configured for higher layer signaling, and offset1 is a subframe number offset value predetermined or configured for higher layer signaling.

Further, the following conditions may be defined:

condition 1: a PDSCH transmitted in a transmission subframe in which subframe number n does not satisfy (n-offset 1) modS1 ═ 0; or,

condition 1: PDSCH transmitted in a transmission subframe in which subframe number n does not satisfy (n-offset 1) mod s1= 0;

condition 2: PDSCH transmitted in time division duplex, TDD, special subframes; or,

condition 2: PDSCH transmitted in a specific time division duplex, TDD, special subframe (e.g., special subframe under normal CP, or special subframe under extended CP, or special subframe with specific configuration); or,

condition 3: PDSCH transmitted in subframes containing PBCH and/or synchronization signal transmissions; or,

condition 3: in a partial PRB containing PBCH and/or synchronous signal transmission in a PRB set where PDSCH transmission is located; or,

condition 3: the PRB set where the PDSCH is transmitted comprises the PDSCH transmitted by PBCH and/or synchronous signals;

condition 4: a retransmitted PDSCH;

condition 5: PDSCH in a macro cell;

determining the PDSCH meeting the at least 1 condition or partial PRB in the PDSCH, and adopting a first type DM-RS resource mapping mode, and in other cases, adopting a second type DM-RS resource mapping mode; for example:

only the PDSCH meeting the condition 1 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

only the PDSCH meeting the condition 2 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

only partial PRBs in the PDSCH or the PDSCH meeting the condition 3 adopt a first type DM-RS resource mapping mode, and in other cases, adopt a second type DM-RS resource mapping mode; or,

only the PDSCH meeting the condition 4 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

only the PDSCH meeting the condition 5 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

the PDSCH or partial PRB in the PDSCH meeting any one of the condition 1 and the condition 2 adopts a first type DM-RS resource mapping mode, and adopts a second type DM-RS resource mapping mode in other situations; or,

the PDSCH or partial PRB in the PDSCH meeting any one of the conditions 1 and 3 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

the PDSCH or partial PRB in the PDSCH meeting any one of the condition 1 and the condition 4 adopts a first type DM-RS resource mapping mode, and adopts a second type DM-RS resource mapping mode in other situations; or,

the PDSCH or partial PRB in the PDSCH meeting any one of the condition 1 and the condition 5 adopts a first type DM-RS resource mapping mode, and adopts a second type DM-RS resource mapping mode in other situations; or,

the PDSCH or partial PRB in the PDSCH meeting any one of the conditions 2 and 3 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

the PDSCH or partial PRB in the PDSCH meeting any one of the conditions 2 and 4 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

the PDSCH or partial PRB in the PDSCH meeting any one of the conditions 2 and 5 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

a partial PRB in the PDSCH or the PDSCH meeting any one of the conditions 1, 2 and 3 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

a partial PRB in the PDSCH or the PDSCH meeting any one of the conditions 1, 2 and 4 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

a partial PRB in the PDSCH or the PDSCH meeting any one of the

conditions

1, 2 and 5 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

a partial PRB in the PDSCH or the PDSCH meeting any one of the conditions 2, 3 and 4 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

a partial PRB in the PDSCH or the PDSCH meeting any one of the conditions 2, 3 and 5 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

a partial PRB in the PDSCH or the PDSCH meeting any one of the conditions 3, 4 and 5 adopts a first type DM-RS resource mapping mode, and in other cases, adopts a second type DM-RS resource mapping mode; or,

the method comprises the steps that partial PRBs in the PDSCH or the PDSCH meeting any one of the conditions 1, 2, 3 and 4 are mapped by adopting a first type of DM-RS resource mapping mode, and in other cases, a second type of DM-RS resource mapping mode is adopted; or,

the method comprises the steps that partial PRBs in the PDSCH or the PDSCH meeting any one of the

conditions

1, 2, 3 and 5 are mapped by adopting a first type of DM-RS resource mapping mode, and in other cases, a second type of DM-RS resource mapping mode is adopted; or,

conditions

1, 3, 4 and 5 are mapped by adopting a first type of DM-RS resource mapping mode, and in other cases, a second type of DM-RS resource mapping mode is adopted; or,

the method comprises the steps that partial PRBs in the PDSCH or the PDSCH meeting any one of the conditions 2, 3, 4 and 5 are mapped by adopting a first type of DM-RS resource mapping mode, and in other cases, a second type of DM-RS resource mapping mode is adopted; or,

the PDSCH or part of PRBs in the PDSCH satisfying any of the

above conditions

1, 2, 3, 4, and 5 adopts a first type DM-RS resource mapping manner, and in other cases, adopts a second type DM-RS resource mapping manner.

The condition x (x =1 to 5) is satisfied by specifying one of a plurality of definitions included in the condition x.

It should be noted that, for a plurality of downlink channels of one UE, the method for determining the DM-RS resource mapping manner for different downlink channels may be different, for example, the E-PDCCH and the PBCH use a predetermined method to determine that the first type of DM-RS resource mapping manner is always used, the PDSCH may use a predetermined method to determine the DM-RS resource mapping manner according to different predetermined rule conditions, or may also use a signaling configuration method to determine the DM-RS resource mapping manner through configuration information.

Particularly, the UE and the network side may also agree in advance, or determine, through high-level signaling configuration, that DM-RS resource mapping is not performed for transmission subframes that satisfy a set condition for a certain or all downlink channels. For example, the values of the S2 period and the offset2 value are agreed or signaled in advance, and DM-RS is not transmitted in the PRB where PDSCH is transmitted in the downlink subframe with the subframe number n satisfying (n-offset2) mod S2=0, and PDSCH in the subframe can be demodulated according to DM-RS in the adjacent downlink subframe.

The second type DM-RS resource mapping manner is a mapping manner with reduced resource occupation compared to the first type DM-RS resource mapping manner, and this embodiment may determine the second type DM-RS resource mapping manner by using any one of the following manners:

1) truncated (shortened) DM-RS resource mapping mode

And based on the first type DM-RS resource mapping mode, only mapping the DM-RS to a part of DM-RS resources on the corresponding antenna port under the first type DM-RS resource mapping mode to obtain a resource mapping mode with truncated time domain and/or frequency domain DM-RS resources.

Specifically, for the time domain puncturing manner, the partial DM-RS resources are:

in the first type of DM-RS resource mapping manner, resource units RE corresponding to DM-RS on 2 adjacent OFDM symbols in an orthogonal frequency division multiplexing OFDM symbol including DM-RS mapping resources in one subframe. In the first type of DM-RS resource mapping manner, the OFDM including DM-RS in one subframe includes REs corresponding to DM-RS on 4 adjacent OFDM symbols, and in this embodiment, only the REs corresponding to DM-RS on 2 adjacent OFDM symbols are taken.

Specifically, as shown in fig. 5a and 5b, in the OFDM containing DM-RS, only the REs corresponding to the DM-RS on the first two adjacent OFDM symbols are mapped with DM-RS; alternatively, as shown in fig. 6a, 6b, 7a, and 7b, in the OFDM including the DM-RS, the DM-RS is mapped on the REs corresponding to the DM-RS on the last two adjacent OFDM symbols. Of course, the specific puncturing manner is not limited to this, for example, for a special subframe, on antenna port 7/8/11/13, only in the OFDM containing DM-RS, the DM-RS is mapped on the REs corresponding to the DM-RSs on the first two adjacent OFDM symbols, and on antenna port 9/10/12/14, only in the OFDM containing DM-RS, the DM-RS is mapped on the REs corresponding to the DM-RSs on the last two adjacent OFDM symbols.

For the frequency domain truncation mode, the partial DM-RS resources are: in the first type of DM-RS resource mapping manner, one subframe includes REs corresponding to DM-RS on at least one group of subcarriers with the same number of DM-RS mapping resources, as shown in fig. 8a to 8b, and a part of the DM-RS resources are specifically, in the first type of DM-RS resource mapping manner, each subframe includes REs corresponding to DM-RS on 2 groups of subcarriers with the same number k of DM-RS.

According to another embodiment of the present invention, resource mapping combining time domain and frequency domain truncation, that is, any combination of the above two manners, may be adopted, and will not be described herein.

2) And a newly defined DM-RS resource mapping mode. The redefined resource mapping mode that the number of OFDM symbols (i.e. time domain density) containing DM-RS mapping resources in a subframe is less than the number of OFDM symbols in the first type of DM-RS resource mapping mode, and/or the number of REs (i.e. frequency domain density) corresponding to DM-RS on OFDM symbols containing DM-RS mapping resources is less than the number of REs in the first type of DM-RS resource mapping mode is satisfied

Preferably, the antenna ports for transmitting the DM-RS in this embodiment are antenna ports 7 to 14.

Based on the same inventive concept, the embodiment of the present invention further provides a user equipment UE and a network side device, and because the principle of solving the problem of these devices is similar to a downlink user dedicated DM-RS transmission method, the implementation of these devices can refer to the implementation of the method, and repeated details are not repeated.

As shown in fig. 9, the UE provided in the embodiment of the present invention includes:

a determining unit 901, configured to determine, according to a predetermined agreement between the UE and a network side or according to configuration information sent by the network side, a DM-RS resource mapping manner adopted by a downlink channel, where the DM-RS resource mapping manner is divided into a first type DM-RS resource mapping manner and a second type DM-RS resource mapping manner, the first type DM-RS resource mapping manner is a DM-RS resource mapping manner defined in a long term evolution enhanced LTE-a Rel-10 system, and the second type DM-RS resource mapping manner is a mapping manner in which a DM-RS occupies a reduced resource compared to the first type DM-RS resource mapping manner;

an obtaining unit 902, configured to obtain, in the transmission resource of the downlink channel, the DM-RS information according to the determined DM-RS resource mapping manner.

Preferably, the determining unit determines, according to the configuration information sent by the network side, a DM-RS resource mapping manner adopted by the downlink channel, and specifically includes:

the configuration information indicates a DM-RS resource mapping mode adopted by the UE, and all downlink channels of the UE are determined to adopt the DM-RS resource mapping mode according to the configuration information; or,

the configuration information comprises configuration information for independently indicating DM-RS resource mapping modes adopted by different downlink channels, the downlink channels are determined to adopt a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode according to the configuration information corresponding to each downlink channel, or the downlink channels are determined to adopt one type DM-RS resource mapping mode of the two types DM-RS resource mapping modes in a subframe and/or a physical resource block PRB meeting conditions, otherwise, the other type DM-RS resource mapping mode is adopted, and the subframe and/or PRB meeting the conditions are determined according to the configuration information corresponding to the downlink channels in the configuration information or predetermined according to the UE and a network side; or,

the configuration information only indicates a DM-RS resource mapping mode adopted by a PDSCH (physical downlink shared channel), and according to the configuration information corresponding to the PDSCH, the PDSCH is determined to adopt a first DM-RS resource mapping mode or a second DM-RS resource mapping mode, or the PDSCH is determined to adopt one DM-RS resource mapping mode of the two DM-RS resource mapping modes in a subframe and/or PRB meeting conditions, otherwise, the other DM-RS resource mapping mode is adopted, and the subframe and/or PRB meeting the conditions is determined according to the configuration information corresponding to the PDSCH or is determined according to the preset agreement of the UE and a network side.

Preferably, the determining unit receives the configuration information through at least 1 signaling of a physical downlink control channel PDCCH signaling, an enhanced physical downlink control channel E-PDCCH signaling, a media access control MAC signaling, and a radio resource control RRC signaling.

Preferably, the determining unit determines, according to a predetermined agreement between the UE and the network side, a DM-RS resource mapping manner adopted by the downlink channel, and specifically includes:

determining that the E-PDCCH adopts a first-type DM-RS resource mapping mode; and/or the presence of a gas in the gas,

determining that a physical broadcast channel PBCH adopts a first type DM-RS resource mapping mode; and/or the presence of a gas in the gas,

and determining that the PDSCH adopts a second type DM-RS resource mapping mode in all transmission subframes of the PDSCH, or adopts one type DM-RS resource mapping mode of the two types DM-RS resource mapping modes in the transmission subframes and/or PRBs meeting set conditions, or else, adopting another type DM-RS resource mapping mode.

Preferably, the determining unit determines that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, otherwise, employs another DM-RS resource mapping manner, and specifically includes:

determining that a second type DM-RS resource mapping mode is adopted by the PDSCH in a transmission subframe with the subframe number n satisfying (n-offset 1) mod S1=0, and adopting a first type DM-RS resource mapping mode in other transmission subframes; or,

determining that a PDSCH adopts a first type DM-RS resource mapping mode in a transmission subframe with a subframe number n satisfying (n-offset 1) mod S1 ═ 0, and adopts a second type DM-RS resource mapping mode in other transmission subframes;

s1 is a predetermined or higher layer signaling configured period value, and the offset1 is a predetermined or higher layer signaling configured subframe number offset value.

determining that a first type DM-RS resource mapping mode is adopted by a PDSCH in a time division duplex TDD special subframe, and a second type DM-RS resource mapping mode is adopted in other transmission subframes; or,

determining that a first type DM-RS resource mapping mode is adopted by a PDSCH in a TDD special subframe using a conventional cyclic prefix CP, and a second type DM-RS resource mapping mode is adopted in other transmission subframes; or,

and determining that the PDSCH adopts a first type DM-RS resource mapping mode in the TDD special subframe using the extended CP, and adopts a second type DM-RS resource mapping mode in other transmission subframes.

determining that a PDSCH adopts a first type DM-RS resource mapping mode in a PDSCH transmission subframe containing PBCH and/or synchronous signal transmission, and adopts a second type DM-RS resource mapping mode in other PDSCH transmission subframes; or,

determining that a PDSCH adopts a first type of DM-RS resource mapping mode in a PDSCH transmission subframe containing PBCH and/or synchronous signal transmission, in a PRB set where the PDSCH is transmitted and containing the PBCH and/or the synchronous signal transmission, and in a rest PRB in the PRB set or a PDSCH transmission subframe not containing the PBCH and/or the synchronous signal transmission, adopting a second type of DM-RS resource mapping mode; or,

determining that the PDSCH adopts a first type of DM-RS resource mapping mode in a PDSCH transmission subframe containing PBCH and/or synchronous signal transmission when a PRB set in which the PDSCH is transmitted contains PRBs in which the PBCH and/or synchronous signal transmission is located, and adopting a second type of DM-RS resource mapping mode when the PRB set does not contain the PRBs in which the PBCH and/or synchronous signal transmission is located or in the PDSCH transmission subframe which does not contain the PBCH and/or synchronous signal transmission.

and determining that the PDSCH adopts a first type DM-RS resource mapping mode in a retransmission subframe of the PDSCH, and adopts a second type DM-RS resource mapping mode in an initial transmission subframe of the PDSCH.

and determining that a first type DM-RS resource mapping mode is adopted by the PDSCH in the PDSCH transmission subframe on the macro cell.

Preferably, the determining unit determines the mapping manner of the second type DM-RS resource as follows:

based on the first type DM-RS resource mapping mode, only mapping DM-RS to a part of DM-RS resources on the corresponding antenna port under the first type DM-RS resource mapping mode to obtain a resource mapping mode shortened by the time domain and/or frequency domain DM-RS resources; or,

and the redefined resource mapping mode is satisfied, wherein the number of OFDM symbols containing DM-RS mapping resources in one subframe is less than the number of OFDM symbols in the first type of DM-RS resource mapping mode, and/or the number of resource units (RE) corresponding to DM-RS on OFDM symbols containing DM-RS mapping resources is less than the number of RE in the first type of DM-RS resource mapping mode.

Preferably, the partial DM-RS resources are:

in the first type of DM-RS resource mapping manner, in an OFDM symbol including DM-RS mapping resources in one subframe, REs corresponding to DM-RSs on 2 adjacent OFDM symbols, and/or REs corresponding to DM-RSs on at least one group of subcarriers having the same number of DM-RS mapping resources in one subframe.

An embodiment of the present invention further provides a network side device, as shown in fig. 10, including:

a determining unit 101, configured to determine a DM-RS resource mapping manner used by a downlink channel, where the DM-RS resource mapping manner is divided into a first type DM-RS resource mapping manner and a second type DM-RS resource mapping manner, the first type DM-RS resource mapping manner is a DM-RS resource mapping manner defined in a long term evolution enhanced LTE-ARel-10 system, and the second type DM-RS resource mapping manner is a mapping manner with reduced resource occupation compared with the first type DM-RS resource mapping manner DM-RS;

a transmission unit 102, configured to perform DM-RS resource mapping and transmission in the transmission resource of the downlink channel according to the determined DM-RS resource mapping manner.

Preferably, the determining unit determines the DM-RS resource mapping manner used by the downlink channel, and specifically includes:

determining a DM-RS resource mapping mode adopted by a downlink channel according to transmission conditions and/or transmission requirements, and sending configuration information for indicating the DM-RS resource mapping mode to User Equipment (UE); or,

and determining a DM-RS resource mapping mode adopted by a downlink channel according to the pre-agreement between a network side device and User Equipment (UE).

Preferably, the determining unit determines, according to the transmission condition and/or the transmission requirement, a DM-RS resource mapping manner adopted by the downlink channel, and sends configuration information for indicating the DM-RS resource mapping manner to the user equipment UE, and specifically includes:

determining that all downlink channels of the UE adopt a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode, and sending configuration information for indicating the determined DM-RS resource mapping mode to the UE; or,

determining that the downlink channel adopts a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode aiming at each downlink channel, or, determining that the downlink channel adopts one of the two types of DM-RS resource mapping modes in the subframe and/or physical resource block PRB meeting the condition, otherwise, adopting the other type of DM-RS resource mapping mode, and sending configuration information to the UE, wherein the configuration information comprises configuration information for independently indicating DM-RS resource mapping modes adopted by different downlink channels, the subframe and/or PRB meeting the condition is determined by the determining unit and notified to the UE through configuration information corresponding to the downlink channel in the configuration information or determined according to a predetermined agreement between a network side device and the UE; or,

determining that a Physical Downlink Shared Channel (PDSCH) adopts a first DM-RS resource mapping mode or a second DM-RS resource mapping mode, or determining that the PDSCH adopts one of the two DM-RS resource mapping modes in a subframe and/or a PRB meeting conditions, otherwise, adopting another DM-RS resource mapping mode, and sending configuration information to the UE, wherein the configuration information only indicates the DM-RS resource mapping mode adopted by the PDSCH, and the subframe and/or the PRB meeting the conditions is determined by the determining unit and is notified to the UE through the configuration information or is determined according to a preset agreement between a network side device and the UE.

Preferably, the determining unit sends the configuration information to the UE through at least one of a PDCCH signaling, an E-PDCCH signaling, a MAC signaling, and a RRC signaling.

Preferably, the determining unit determines, according to a predetermined agreement between the network side device and the user equipment UE, a DM-RS resource mapping manner adopted by the downlink channel, and specifically includes:

and determining that the PDSCH adopts a second type DM-RS resource mapping mode in all transmission subframes of the PDSCH, or adopts one type DM-RS resource mapping mode of the two types DM-RS resource mapping modes in the transmission subframes and/or PRBs meeting set conditions, or else adopts another type DM-RS resource mapping mode.

Preferably, the determining unit determines that the PDSCH uses one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, otherwise, uses another DM-RS resource mapping manner, and specifically includes:

determining that a first type DM-RS resource mapping mode is adopted by the PDSCH in a transmission subframe with the subframe number n satisfying (n-offset 1) mod S1=0, and a second type DM-RS resource mapping mode is adopted in other transmission subframes;

determining that a first type DM-RS resource mapping mode is adopted by a PDSCH in a PDSCH transmission subframe containing PBCH and/or synchronous signal transmission, and a second type DM-RS resource mapping mode is adopted in other transmission subframes; or,

determining that a first type of DM-RS resource mapping mode is adopted by a PDSCH in a PDSCH transmission subframe containing PBCH and/or synchronous signal transmission and only in PRBs containing PBCH and/or synchronous signal transmission in a PRB set where the PDSCH is transmitted, and a second type of DM-RS resource mapping mode is adopted in the rest PRBs in the PRB set or the PDSCH transmission subframe not containing PBCH and/or synchronous signal transmission; or,

and determining that a first type DM-RS resource mapping mode is adopted in the PDSCH transmission subframe of the PDSCH on the macro cell.

Preferably, the partial DM-RS resources are:

The embodiment of the present invention further provides a system for transmitting a demodulation reference signal DM-RS dedicated to a downlink user, including: the user equipment UE and the network side device provided in the above embodiments.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for transmitting a demodulation reference signal DM-RS special for a downlink user is characterized by comprising the following steps:

2. The method of claim 1, wherein determining a DM-RS resource mapping scheme used by a downlink channel according to configuration information sent by a network side specifically comprises:

3. The method according to claim 1 or 2, wherein the UE receives the configuration information through at least 1 of physical downlink control channel PDCCH signaling, enhanced physical downlink control channel E-PDCCH signaling, medium access control MAC signaling, and radio resource control RRC signaling.

4. The method of claim 1, wherein determining the DM-RS resource mapping scheme used by the downlink channel according to a pre-agreement between the UE and the network side specifically comprises:

5. The method according to claim 4, wherein determining that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employing the other DM-RS resource mapping manner specifically includes:

determining that a second type DM-RS resource mapping mode is adopted by the PDSCH in a transmission subframe with the subframe number n satisfying (n-offset 1) mod S1 ═ 0, and adopting a first type DM-RS resource mapping mode in other transmission subframes; or,

6. The method according to claim 4, wherein determining that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employing the other DM-RS resource mapping manner specifically includes:

determining that a PDSCH adopts a first type DM-RS resource mapping mode in a time division duplex TDD special subframe and adopts a second type DM-RS resource mapping mode in other transmission subframes; or,

determining that the PDSCH adopts a first type DM-RS resource mapping mode in a TDD special subframe using a conventional cyclic prefix CP, and adopts a second type DM-RS resource mapping mode in other transmission subframes; or,

7. The method according to claim 4, wherein determining that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employing the other DM-RS resource mapping manner specifically includes:

8. The method according to claim 4, wherein determining that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employing the other DM-RS resource mapping manner specifically includes:

9. The method of claim 1, wherein determining the DM-RS resource mapping scheme used by the downlink channel according to a pre-agreement between the UE and the network side specifically comprises:

10. The method according to any one of claims 1 to 9, wherein the mapping manner of the second type DM-RS resource is:

11. The method of claim 10, wherein the partial DM-RS resources are:

12. A method for transmitting a demodulation reference signal DM-RS special for a downlink user is characterized by comprising the following steps:

13. The method according to claim 12, wherein the determining the DM-RS resource mapping scheme adopted by the downlink channel specifically includes:

and determining a DM-RS resource mapping mode adopted by a downlink channel according to the pre-agreement between a network side and User Equipment (UE).

14. The method according to claim 13, wherein the determining, according to the transmission condition and/or the transmission requirement, a DM-RS resource mapping scheme adopted by the downlink channel, and sending configuration information for indicating the DM-RS resource mapping scheme to the UE specifically includes:

determining that the downlink channel adopts a first type DM-RS resource mapping mode or a second type DM-RS resource mapping mode aiming at each downlink channel, or, determining that the downlink channel adopts one of the two types of DM-RS resource mapping modes in the subframe and/or physical resource block PRB meeting the condition, otherwise, adopting the other type of DM-RS resource mapping mode, and sending configuration information to the UE, wherein the configuration information comprises configuration information for independently indicating DM-RS resource mapping modes adopted by different downlink channels, the subframe and/or PRB meeting the conditions is determined by a network side and is notified to the UE through configuration information corresponding to the downlink channel in the configuration information or is determined according to a predetermined agreement between the network side and the UE; or,

determining that a Physical Downlink Shared Channel (PDSCH) adopts a first DM-RS resource mapping mode or a second DM-RS resource mapping mode, or determining that the PDSCH adopts one of the two DM-RS resource mapping modes in a subframe and/or a PRB meeting conditions, otherwise, adopting another DM-RS resource mapping mode, and sending configuration information to the UE, wherein the configuration information only indicates the DM-RS resource mapping mode adopted by the PDSCH, and the subframe and/or the PRB meeting the conditions is determined by a network side and is notified to the UE through the configuration information or is determined according to a preset agreement between the network side and the UE.

15. The method according to claim 13 or 14, wherein the configuration information is sent to the UE through at least one of physical downlink control signaling PDCCH signaling, enhanced physical downlink control signaling E-PDCCH signaling, medium access control MAC signaling, and radio resource control RRC signaling.

16. The method of claim 13, wherein determining the DM-RS resource mapping scheme used by the downlink channel according to a pre-agreement between the network side and the UE specifically comprises:

determining that a first type DM-RS resource mapping mode is adopted by the channel E-PDCCH; and/or the presence of a gas in the gas,

17. The method according to claim 16, wherein determining that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employing the other DM-RS resource mapping manner specifically includes:

determining that a first type DM-RS resource mapping mode is adopted by a PDSCH in a transmission subframe with a subframe number n satisfying (n-offset 1) mod S1 ═ 0, and a second type DM-RS resource mapping mode is adopted in other transmission subframes;

18. The method according to claim 16, wherein determining that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employing the other DM-RS resource mapping manner specifically includes:

determining that a PDSCH adopts a first type DM-RS resource mapping mode in a time division duplex TDD special subframe, and adopts a second type DM-RS resource mapping mode in other transmission subframes; or,

19. The method according to claim 16, wherein determining that the PDSCH employs one of the two DM-RS resource mapping manners in a subframe and/or PRB satisfying a set condition, and otherwise, employing another DM-RS resource mapping manner specifically includes:

20. The method according to claim 16, wherein determining that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employing the other DM-RS resource mapping manner specifically includes:

21. The method of claim 12, wherein determining the DM-RS resource mapping scheme used by the downlink channel according to a pre-agreement between the network side and the UE specifically comprises:

22. The method according to any one of claims 12 to 21, wherein the mapping manner of the second type DM-RS resource is:

23. The method of claim 22, wherein the partial DM-RS resources are:

24. A User Equipment (UE), comprising:

25. The UE of claim 24, wherein the determining unit determines, according to the configuration information sent by the network side, a DM-RS resource mapping manner used by the downlink channel, specifically includes:

26. The UE according to claim 24 or 25, wherein the determining unit receives the configuration information through at least 1 of physical downlink control channel, PDCCH, enhanced physical downlink control channel, E-PDCCH, medium access control, MAC, and radio resource control, RRC, signaling.

27. The UE of claim 24, wherein the determining unit determines, according to a predetermined agreement between the UE and the network side, a DM-RS resource mapping scheme adopted by the downlink channel, specifically including:

28. The UE of claim 27, wherein the determining unit determines that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employs another DM-RS resource mapping manner, specifically includes:

29. The UE of claim 27, wherein the determining unit determines that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employs another DM-RS resource mapping manner, specifically includes:

30. The UE of claim 27, wherein the determining unit determines that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employs another DM-RS resource mapping manner, specifically includes:

31. The UE of claim 27, wherein the determining unit determines that the PDSCH employs one of the two DM-RS resource mapping manners in a transmission subframe and/or PRB satisfying a set condition, and otherwise, employs another DM-RS resource mapping manner, specifically includes:

32. The UE of claim 24, wherein the determining unit determines, according to a predetermined agreement between the UE and the network side, a DM-RS resource mapping scheme adopted by the downlink channel, specifically comprising:

33. The UE according to any one of claims 24 to 32, wherein the determining unit determines the mapping manner of the second type DM-RS resources as:

34. The UE of claim 33, wherein the partial DM-RS resources are:

35. A network-side apparatus, comprising:

36. The network-side device of claim 35, wherein the determining unit determines the DM-RS resource mapping scheme used by the downlink channel, specifically includes:

37. The network-side apparatus of claim 36, wherein the determining unit determines, according to the transmission condition and/or the transmission requirement, a DM-RS resource mapping scheme adopted by the downlink channel, and sends configuration information used for indicating the DM-RS resource mapping scheme to the UE, specifically includes:

38. The network apparatus of claim 36 or 37, wherein the determining unit sends the configuration information to the UE through at least one of PDCCH signaling, E-PDCCH signaling, MAC signaling, and RRC signaling.

39. The network-side device of claim 36, wherein the determining unit determines, according to a predetermined agreement between the network-side device and the UE, a DM-RS resource mapping scheme adopted by a downlink channel, specifically includes:

40. The network side apparatus of claim 39, wherein the determining unit determines that the PDSCH employs one of the two types of DM-RS resource mapping manners in a transmission subframe and/or a PRB satisfying a set condition, and otherwise, employs another type of DM-RS resource mapping manner, specifically includes:

41. The network side apparatus of claim 39, wherein the determining unit determines that the PDSCH employs one of the two types of DM-RS resource mapping manners in a transmission subframe and/or a PRB satisfying a set condition, and otherwise, employs another type of DM-RS resource mapping manner, specifically includes:

42. The network side apparatus of claim 39, wherein the determining unit determines that the PDSCH employs one of the two types of DM-RS resource mapping manners in a transmission subframe and/or a PRB satisfying a set condition, and otherwise, employs another type of DM-RS resource mapping manner, specifically includes:

43. The network side apparatus of claim 39, wherein the determining unit determines that the PDSCH employs one of the two types of DM-RS resource mapping manners in a transmission subframe and/or a PRB satisfying a set condition, and otherwise, employs another type of DM-RS resource mapping manner, specifically includes:

44. The network-side device of claim 35, wherein the determining unit determines, according to a predetermined agreement between the network-side device and the UE, a DM-RS resource mapping scheme adopted by a downlink channel, specifically includes:

45. The network-side device according to any one of claims 35 to 44, wherein the determining unit determines the mapping manner of the second type DM-RS resource as follows:

46. The network-side apparatus of claim 45, wherein the partial DM-RS resources are:

47. A system for downlink user dedicated demodulation reference signal DM-RS transmission, comprising:

the user equipment UE is used for determining a DM-RS resource mapping mode adopted by a downlink channel according to the pre-agreement between the UE and a network side or according to configuration information sent by the network side; in the transmission resource of the downlink channel, acquiring DM-RS information according to the determined DM-RS resource mapping mode;

the network side device is used for determining a DM-RS resource mapping mode adopted by a downlink channel; in the transmission resources of the downlink channel, performing DM-RS resource mapping and transmission according to the determined DM-RS resource mapping mode;

the DM-RS resource mapping mode is divided into a first DM-RS resource mapping mode and a second DM-RS resource mapping mode, the first DM-RS resource mapping mode is a DM-RS resource mapping mode defined in a long term evolution enhanced LTE-A Rel-10 system, and the second DM-RS resource mapping mode is a mapping mode which occupies less resources compared with the DM-RS resource mapping mode of the first DM-RS resource mapping mode.