WO2015007152A1

WO2015007152A1 - Method and apparatus for indicating dm-rs pattern

Info

Publication number: WO2015007152A1
Application number: PCT/CN2014/081057
Authority: WO
Inventors: 张兴炜
Original assignee: 华为技术有限公司
Priority date: 2013-07-19
Filing date: 2014-06-28
Publication date: 2015-01-22
Also published as: CN104301067A; CN104301067B

Abstract

A method and apparatus for indicating a Demodulation Reference Signal (DM-RS) pattern. The method includes: obtaining a specific field in Downlink Control Information (DCI); determining the corresponding DM-RS pattern according to the specific field. In the process of reducing the cost of pilots and control signaling by reducing reference signals, in the present invention, the UE concludes the DM-RS pattern selected by the eNB according to the field relating to downlink channel quality in DCI, or, the field with redundancy. Hence, unlike the prior art, the eNB does not need to add additional new fields to indicate the DM-RS pattern used on the UE, thereby reducing the cost of the pilots and control signaling.

Description

DM-RS pattern indication method and device

This application is submitted to the Chinese Patent Office on July 19, 2013, and the application number is

The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of communications technologies, and in particular, to a DM-RS pattern indication method and apparatus. Background technique

3rd Generation Partnership Project (3GPP) Long Term Evolution-Advanced (LTE-A) Rel-10/11/12 is Long Term Evolution (LTE) Rel-8/ With the enhancement of version 9, the LTE-A system has higher bandwidth requirements than the LTE system and supports peak data rates up to lG/s. In order to meet the requirements of LTE-A, the LTE-A system uses Carrier Aggregation (CA) technology as its method of expanding system bandwidth, and uses a large number of antenna enhancement technologies (Multi-Input Multiple-Output). , MIMO) and link adaptation techniques to increase data rates and system performance.

In the LTE-A Rel-12 release, enhancements to hotspot areas have become a hot topic. The hotspot area includes indoor and outdoor scenes, and a plurality of low-power micro base stations (Pico eNBs) cover a plurality of small cells (Small Cell Network, SCN). The indoor Pico eNB only supports low-speed mobile user equipment (User Equipment, UE for short). The outdoor Pico eNB supports medium-speed mobile UEs in addition to low-speed mobile UEs. Both Pico eNBs do not support high-speed mobile. UE. Generally, the moving speed is called low-speed movement between 0km/h-15km/h, the moving speed is between 15km/h-60km/h, which is called medium-speed movement, and the moving speed is above 60km/h, which is called high-speed movement.

Since the micro base station only serves the medium and low speed mobile UE, the radio channel quality between the micro base station and the UE is relatively good, the coverage is relatively small, and the number of serving UEs is relatively small, so the pilot can be reduced. And the overhead of control signaling.

As shown in FIG. 1, a resource block (RB) is composed of a plurality of resource elements (REs). In an RB or RB pair, some RE locations are used to transmit DM-RS. The DM-RS pattern refers to a graphical representation of the number and location of REs used to transmit DM-RSs in RBs. Depending on the number and location of REs for transmitting DM-RSs in the RBs, there may be multiple DM-RS patterns, and these DM-RS patterns are respectively stored in the eNB and the UE, and the UE uses the same DM as the eNB. - RS pattern to demodulate data transmitted by the eNB.

The reduction of pilot and control signaling overhead can be achieved by reducing the Demodulation Reference Signal (DM-RS). Specifically, more sparse time domain or/and frequency domain DM-RS patterns can be used. To achieve the purpose of reducing the pilot overhead; at the same time, in order to be compatible with the existing DM-RS pattern, different DM-RS patterns are needed; thus, the eNB needs to inform the UE which DM-RS pattern the eNB uses, so that The UE can determine the DM-RS pattern that the UE should use according to the DM-RS pattern used by the eNB. In the prior art, the manner in which the eNB notifies the UE to use the DM-RS pattern includes: adding a new field by using Downlink Control Information (DCI) signaling at the physical layer to indicate the DM-RS pattern; In this way, a new field needs to be added, so the physical downlink control channel (PDCCH) has a relatively large overhead.

Summary of the invention

In view of this, the present invention provides a DM-RS pattern indication method and apparatus to achieve the purpose of saving downlink control channel overhead. This application is implemented as follows:

In a first aspect, an embodiment of the present invention provides a demodulation reference signal DM-RS pattern indication method, including: acquiring a specific field in a downlink control information DCI; the specific field includes a downlink channel quality Quantity related fields, or fields with redundant status;

A corresponding DM-RS pattern for use on the UE is determined based on the particular field.

In a first possible implementation manner of the first aspect, the specific field includes: one or any combination of a modulation coding scheme MCS, a new data indication NDI, or a redundancy version RV.

In a first implementation manner of the first aspect, when the specific field includes the MCS, determining, according to the specific field, the corresponding DM-RS pattern used on the UE, including:

Determining a corresponding to the MCS according to the mapping relationship between the MCS value and the DM-RS pattern

DM-RS pattern.

In a first implementation manner of the first aspect, when the specific field includes the NDI, determining, according to the specific field, the corresponding DM-RS pattern used on the UE, including:

When the NDI indicates retransmission, a DM-RS pattern having a density not less than the original DM-RS pattern density is used for the retransmitted data;

When the NDI indicates a new transmission, a DM-RS pattern having a lower density than the original DM-RS pattern is used for the newly transmitted data.

In a first implementation manner of the first aspect, when the specific field includes an RV, the determining, according to the specific field, the corresponding DM-RS pattern used on the UE, includes:

And determining, according to the mapping relationship between the value of the RV and the DM-RS pattern, the DM-RS pattern corresponding to the RV.

In a first implementation manner of the first aspect, when the specific field includes an MCS and an RV, the determining, according to the specific field, the corresponding DM-RS pattern used on the UE, includes: according to the MCS Determining the density of the corresponding DM-RS pattern of the MCS by mapping the value to the DM-RS pattern density;

The DM-RS pattern corresponding to the RV is determined in the DM-RS pattern of the determined density by the mapping relationship between the value of the RV and the DM-RS pattern.

In a first implementation of the first aspect, when the specific field includes NDI and RV, Determining a density of the corresponding DM-RS pattern according to the value of the NDI;

In a first implementation manner of the first aspect, when the specific field includes the MCS and the RV, the method further includes:

The number of subsequent subframes using the same DM-RS pattern is determined based on the value of the RV.

In the first implementation manner of the first aspect, when the specific field includes the NDI and the RV, the method further includes:

In a first implementation manner of the first aspect, the determining, according to the value of the RV, the number of subsequent subframes that use the same DM-RS pattern includes:

The number of subsequent subframes is a value of the RV, or a product of the value of the RV and a preset value. In a second aspect, an embodiment of the present invention provides a DM-RS pattern indicating apparatus, including: a specific field obtaining module, configured to acquire a specific field in a downlink control information DCI; the specific field includes a field related to a downlink channel quality , or, a field with redundant status;

And a pattern determining module, configured to determine, according to the specific field, a corresponding DM-RS pattern used on the UE.

In a first possible implementation manner of the second aspect, the specific field includes: one or any combination of a modulation coding scheme MCS, a downlink allocation index NDI, or a redundancy version RV.

In a first possible implementation manner of the second aspect, when the specific field includes an MCS, the pattern determining module is configured to:

And determining, according to the mapping relationship between the MCS value and the DM-RS pattern, a DM-RS pattern corresponding to the MCS.

In a first possible implementation manner of the second aspect, when the specific field includes an NDI, the pattern determining module is configured to:

When the NDI indicates retransmission, the density used for retransmitting data is not less than the original DM-RS map. DM-RS pattern of sample density;

In a first possible implementation manner of the second aspect, when the specific field includes an RV, the pattern determining module is configured to:

In a first possible implementation manner of the second aspect, when the specific field includes the MCS and the RV, the pattern determining module includes:

a pattern density determining unit, configured to determine a density of a corresponding DM-RS pattern of the MCS according to a mapping relationship between the MCS value and a DM-RS pattern density;

And a pattern identifying unit, configured to determine, according to the mapping relationship between the value of the RV and the DM-RS pattern, the DM-RS pattern corresponding to the RV in the determined density DM-RS pattern.

In a first possible implementation manner of the second aspect, when the specific field includes the NDI and the RV, the pattern determining module includes:

a pattern density determining unit, configured to determine a density of the corresponding DM-RS pattern according to the value of the NDI;

In a first possible implementation manner of the second aspect, when the specific field includes the MCS and the RV, the method further includes a subsequent subframe number determining module;

And determining, according to the value of the RV, a number of subsequent subframes that use the same DM-RS pattern. In a first possible implementation manner of the second aspect, when the specific field includes the NDI and the RV, the subsequent subframe number determining module is further included;

And determining, according to the value of the RV, a number of subsequent subframes that use the same DM-RS pattern. In a first possible implementation of the second aspect, The number of subsequent subframes is a value of the RV, or a product of the value of the RV and a preset value. It can be seen from the above technical solution that the UE in the present application infers the DM-RS pattern selected by the eNB through a specific field in the DCI in the process of reducing the pilot and control signaling overhead by reducing the reference signal. Instead of the prior art, the eNB is required to additionally add new fields to indicate the DM-RS pattern that should be used on the UE, thereby reducing the overhead of pilot and control signaling.

DRAWINGS

In order to more clearly illustrate the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the description of the prior art will be briefly made. Obviously, the drawings in the following description are only Some embodiments of the invention may be obtained by those of ordinary skill in the art in view of the drawings without additional inventive labor.

1 is a schematic diagram of a DM-RS pattern described in the present application;

2 is a schematic flowchart of a method for indicating a DM-RS pattern according to the present application; FIG. 3 is another schematic diagram of a DM-RS pattern according to the present application;

4 is another schematic diagram of the DM-RS pattern described in the present application;

FIG. 5 is still another schematic diagram of the DM-RS pattern described in the present application; FIG. 6 is another schematic diagram of the DM-RS pattern described in the present application;

7 is a schematic structural diagram of a DM-RS pattern indicating device according to the present application;

FIG. 8 is still another schematic structural diagram of the DM-RS pattern indicating device according to the present application;

FIG. 9 is still another schematic structural diagram of the DM-RS pattern indicating device according to the present application;

FIG. 10 is a schematic structural diagram of a user equipment in the present application.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention. Rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

To achieve the purpose of reducing the PDCCH overhead when the eNB notifies the UE to use the DM-RS pattern, the present invention provides a DM-RS pattern indication method. As shown in FIG. 2, the method includes the following steps:

Sl l, obtaining a specific field in the downlink control information DCI;

In the present application, in order to achieve the purpose of reducing the PDCCH overhead when the eNB informs the UE to use the DM-RS pattern, a specific field in the existing DCI is utilized.

The specific fields in this application refer to fields related to the quality of the downlink channel, or fields with a redundant state.

Specifically, the density of the DM-RS used by the eNB is related to the quality of the downlink channel. When the target block error rate (BLER) is constant, the higher density DM-RS should be used when the theoretical downlink channel quality is poor. The lower density DM-RS can be used when the downlink channel quality is good. In the existing DCI, the value of some fields is also related to the downlink channel quality. For example, according to the principle of link adaptation technology, the eNB is different according to the principle. The downlink channel quality is selected by a different Modulation and Coding Scheme (MCS). This is because, in LTE, the downlink channel quality is obtained by feedback measurement of the UE, and the channel quality indicator is indicated by the UE. CQI) For the eNB, the 4-bit CQI corresponds to different Signal-to-Interference and Noise Ratio (SINR). The better the channel quality, the larger the CQI value, the worse the channel quality, the value of CQI. The smaller it is. After receiving the CQI, the eNB selects an appropriate MCS for the downlink according to the CQI. Specifically, the better the channel quality eNB can use the higher order modulation mode and the higher the MCS corresponding to the code rate, the worse In addition, the New Data Indicator (NDI) can also be used to reflect the quality of the downlink channel. For example, when NDI = 0, according to the original NDI indication information, the meaning is that the signal is sent. Retransmitted data, this means that it has been sent once, but the UE has not received it or not. If there is correct reception, it means that the channel condition is not good at this time; when NDI = 1, according to the original NDI indication information, the meaning means that the initial transmission data is sent, indicating that the channel quality has not deteriorated.

In order to reduce the PDCCH overhead, the eNB may use different time domain or/and frequency domain sparsity DM-RS patterns according to the channel quality; specifically, the better the channel quality, the time domain or/and frequency can be used. The DM-RS pattern with larger domain sparsity, that is, the DM-RS pattern with smaller RS density, thereby reducing the resource occupancy of the Demodulation Reference Signal (DM-RS) in the subframe; The worse the channel quality, the smaller the DM-RS pattern with smaller time domain or/and frequency domain sparsity, ie, the DM-RS pattern with higher RS density is used to ensure the transmission quality.

It can be known that the eNB selects an appropriate DM-RS pattern and has a certain correlation with the channel quality. The UE can also obtain some downlink channel quality related information by acquiring the downlink control channel DCI related to the downlink channel quality. Information, therefore, can be used to determine the DM-RS pattern indicated by the eNB.

In the present application, the field including the redundant state refers to a certain state in the DCI, including a state that is not used, so that by utilizing the state that is not used in these fields, the UE can be added to the UE without additionally adding a dedicated field. Indicates the DM-RS pattern.

For example, when a field uses 3 bits to identify 5 carriers, 3 bits will have 8 states, and 5 carriers will only use 5 states, and the other 3 will not be used. It is called a redundant state.

In the present application, the fields including the redundancy status may be, but are not limited to, the various fields mentioned herein, as long as they are in the DCI and include redundant states.

S12. Determine a corresponding DM-RS pattern according to the specific field.

In practical applications, the most commonly used downlink channel quality related fields in a specific field may include MCS and NDI, specifically:

Since the eNB selects an appropriate MCS after receiving the reported CQI information of the UE, and the eNB selects an appropriate DM-RS pattern according to the quality of the channel, it can be concluded that the eNB The selected DM-RS pattern selected by the MCS and the eNB is associated with the channel quality; that is, after obtaining the MCS selected by the eNB, the RS density of the DM-RS pattern selected by the eNB can be derived.

In this application, as shown in FIG. 3 to FIG. 5, both the eNB and the UE store multiple DM-RS patterns, and each DM-RS pattern has a mapping relationship with a MCS value range. The eNB will be at

The DL grant of the PDCCH/EPDCCH carries an MCS field, which is used to indicate the MCS used by the PDSCH. The DL grant in the PDCCH/EPDCCH received by the UE may be mapped from the MCS to the corresponding DM-RS pattern, and the DM-RS pattern is used for the PDSCH. For example, when the MCS is at 0 to 9, corresponding to the DM-RS pattern in FIG. 3, when the MCS is at 10 to 16, corresponding to the DM-RS pattern in FIG. 4, when the MCS is at 17 to 31, corresponding to FIG. DM-RS pattern.

In this way, based on the link adaptation technology, the eNB selects the MCS according to the received CQI information of the UE from 0 to 9; meanwhile, according to the current channel quality, the eNB should select the DM-RS pattern as shown in FIG. In order to ensure the data transmission requirements, the sparse time domain or / and frequency domain DM-RS patterns are used as much as possible to reduce the pilot overhead.

Since the MCS selected by the eNB and the DM-RS pattern selected by the eNB are associated with the channel quality, after obtaining the field of the MCS information in the DCI, the UE learns that the MCS selected by the eNB is 10 to 16, so that The mapping relationship infers the RS density of the DM-RS pattern selected by the eNB. When each RS density corresponds to only one DM-RS pattern, it is concluded that the RS density of the DM-RS pattern can be inferred that the DM-RS pattern is The DM-RS pattern shown in Figure 4.

In addition, in the present application, after the UE obtains the field of the NDI information in the DCI, it may be determined whether the channel quality is deteriorated by the value of the NDI, and further whether the eNB selects a denser DM-RS pattern. Specifically, when the value of the NDI is 0, it indicates that the NDI indicates retransmission, indicating that the channel quality is degraded, and thus it can be inferred that the eNB does not select a smaller density for retransmitting data.

DM-RS pattern, at this time, according to the preset convention, it is necessary to use a DM-RS pattern with a density not less than the original DM-RS pattern density. In addition, when the value of NDI is 0, it indicates that the NDI indicates a new transmission, indicating that the channel quality is good. At this time, according to the preset convention, the original DM-RS map can be used. A DM-RS pattern with a small sample density to save the overhead of the downlink control channel.

In the present application, the field including the redundant state is most typically an RV field, that is, the corresponding DM-RS pattern can be indicated by the value in the RV field. Specifically, the mapping relationship between the RV value and the DM-RS pattern may be preset, so that the corresponding DM-RS pattern may be determined according to the value of the RV field.

As can be seen from the above, in the process of reducing the pilot and control signaling overhead by reducing the reference signal, in the present application, the UE passes the field related to the downlink channel quality in the DCI, or has a redundant The field is used to infer the DM-RS pattern selected by the eNB, so that there is no need to additionally add a new field to indicate the DM-RS pattern as in the prior art, thus reducing the overhead of pilot and control signaling.

Further, in the present application, the field RV can also be used in conjunction with the field MCS or the field NDf.

Specifically, when the field RV is used in combination with the field MCS, when the DM-RS pattern density corresponding to one MCS field includes multiple DM-RS patterns, the multiple DM-RS patterns may be identified by different values of the field RV. So that the UE can further determine the required DM-RS pattern. For example, the DM-RS pattern shown in FIG. 6 has the same density as the DM-RS pattern shown in FIG. 5, and at this time, when the field RV=0, corresponding to the DM-RS pattern shown in FIG. 5, when When the field RV=1, it corresponds to the DM-RS pattern shown in FIG. 6.

In addition, the field RV is used in combination with the MCS, and the UE may determine the required DM-RS pattern according to the MCS field, and then obtain the number of subframes that can be used by the DM-RS pattern through the value of the field RV. When the UE obtains the MCS information field in the DCI, it knows that the MCS selected by the eNB is between 10 and 16, so that the required DM-RS pattern is the DM-RS pattern as shown in FIG. The value of the RV is used to determine the number of subframes in which the DM-RS pattern shown in FIG. 4 can be used later. The specific number of subsequent subframes may be the value of the RV itself. For example, when the value of the RV is equal to 0, the DM-RS pattern Only valid for this frame; when the value of RV is equal to 1, the number of subsequent subframes may be lk; when the value of RV is equal to 2, the number of subsequent subframes may be 2k; in addition, the value of the RV may be multiplied by The preset value, for example, when the value of RV is equal to 1, the number of subsequent subframes may be lk. When the value of RV is equal to 2, the number of subsequent subframes may be 2k, that is, the preset value may be set to lk; The determination of the preset value can be determined according to the needs of the actual application, and no specific numerical limitation is made here.

In the present application, the number of subframes in which the same DM-RS pattern can be subsequently used is determined by the RV value, so that the same DM-RS pattern can be used in a certain subframe, thereby avoiding frequent DM-RS patterns. Transform.

In addition, the joint use of the field RV and the NDI may specifically be: when the UE determines the required DM-RS pattern according to the NDI field, when the corresponding same RS density includes multiple DM-RS patterns, the different values of the field RV may be adopted. The plurality of DM-RS patterns are identified to enable the UE to accurately determine the required DM-RS pattern.

In addition, the joint use of the field RV and the NDI may specifically be: the UE determines the required DM-RS pattern according to the NDI field, and then obtains the number of subframes that can be used by the DM-RS pattern by using the value of the field RV; The role and application principle of RV is similar to the joint use of RV and MCS. The purpose is to use the same DM-RS pattern in a certain sub-frame, thus avoiding the frequent conversion of DM-RS patterns.

The present invention provides a DM-RS pattern indicating device 10, as shown in Fig. 7, the DM-RS pattern indicating device 10 includes:

a specific field obtaining module 01, configured to acquire a specific field in the DCI; the specific field includes a field related to the quality of the downlink channel, or a field having a redundant state;

The pattern determining module 02 is configured to determine a corresponding DM-RS pattern used on the UE according to a specific field.

In the present application, in order to achieve the purpose of reducing PDCCH overhead when the eNB informs the UE to use the DM-RS pattern, a specific field in the existing DCI is utilized.

In practical applications, the DM-RS pattern indicating device 10 in the present application may be disposed in the UE. In this way, after the eNB sends the DCI to the UE, the specific field obtaining module 01 can acquire the specific field according to the DCI received by the UE.

The field related to the downlink channel quality in the present application may specifically be MCS or NDI; for example, the better the channel quality, the higher order modulation mode and the higher the code rate corresponding to the MCS, and the NDI may also be used. In order to reflect the quality of the downlink channel, for example, when NDI = 0, according to the original NDI indication information, the meaning is that the retransmitted data is sent, which means that it has been sent once, but the UE has not received or is not correct. Receiving, indicating that the channel condition is not good at this time; when NDI = 1, according to the original NDI indication information, the meaning refers to the initial data transmitted, indicating that the channel quality has not deteriorated.

For example, the specific field includes the field MCS. In this application, as shown in FIG. 3 to FIG. 5, both the eNB and the UE store multiple DM-RS patterns; since the eNB selects a suitable channel according to the quality of the channel. The MCS is used for the downlink, and the eNB also instructs the UE to determine the corresponding DM-RS pattern according to the quality of the channel. To this end, each DM-RS pattern and one MCS are set in this application. The value range has a mapping relationship; for example, when the MCS is 0 to 9, corresponding to the DM-RS pattern in FIG. 3, when the MCS is 10 to 16, corresponding to the DM-RS pattern in FIG. 4, when the MCS is in the MCS From 17 to 31, it corresponds to the DM-RS pattern in Figure 5.

Due to the above mapping relationship, the pattern determining module 02 can determine the corresponding DM-RS pattern used on the UE according to the mapping relationship. For example, when the MCS field obtained by the specific field obtaining module 01 has a value of 5, the pattern determining module 02 can infer that the eNB should select the DM-RS pattern as shown in FIG. 3 according to the above mapping relationship. It is also possible to determine the DM-RS pattern as shown in FIG. 3 that the UE should also use. By analogy, when the field MCS obtained by the specific field obtaining module 01 has a value of 12, the pattern determining module 02 can determine that the corresponding DM-RS pattern used on the UE is the DM-RS pattern as shown in FIG.

Taking a specific field including the field NDI as an example, in this application, the corresponding DM-RS pattern is determined according to the field NDI, and the specific determining scheme is: When the field NDI obtained by the specific field obtaining module 01 is 0, that is, when the NDI indicates retransmission, the pattern determining module 02 can determine that the DM-RS having a density not less than the original DM-RS pattern density is used for the retransmitted data. For example, after the DM-RS pattern shown in FIG. 4 is used as an example, when the field NDI obtained by the specific field obtaining module 01 is 0, the data can be re-transmitted according to the preset convention as shown in FIG. 4 The DM-RS pattern shown, or, uses the DM-RS pattern shown in Figure 3.

When the field NDI obtained by the specific field obtaining module 01 is 1, that is, when the NDI indicates a new transmission, a DM-RS pattern having a smaller density than the original DM-RS pattern is used for the newly transmitted data. Taking the DM-RS pattern as shown in FIG. 4 as an example, when the field NDI obtained by the specific field obtaining module 01 is 1, the DM-RS pattern shown in FIG. 5 may be used for the newly transmitted data. The principle of the scheme is that when the value of the NDI is 0, it indicates that the NDI indicates retransmission, indicating that the channel quality is degraded, and thus it can be inferred that the eNB does not select a DM-RS pattern with a smaller density for retransmitting data. According to the preset convention, it is necessary to use a DM-RS pattern with a density not less than the original DM-RS pattern density. In addition, when the value of NDI is 1, it indicates that the NDI indicates a new transmission, indicating that the channel quality is good. At this time, according to a preset convention, a DM-RS pattern having a smaller density than the original DM-RS pattern can be used. The overhead of the downlink control channel is saved.

In the present application, the field including the redundant state means that in some fields, the state that is not used is included, so that by using the state that is not used in these fields, the DM can be indicated to the UE without additionally adding a dedicated field. RS pattern.

In the present application, the field including the redundant state is most typically an RV field, that is, the corresponding DM-RS pattern can be indicated by the value in the RV field. Specifically, the mapping relationship between the value of the RV and the DM-RS pattern may be preset, so that the pattern determining module 02 can be based on the specific word. The value of the RV field acquired by the segment acquisition module 01 is used to determine the corresponding DM-RS pattern used on the UE.

It can be seen from the above that in the process of reducing the pilot and control signaling overhead by reducing the reference signal, in the present application, the DM-RS pattern indicating device is related to the downlink channel quality in the DCI, or includes redundancy. The field of the state is used to infer the DM-RS pattern selected by the eNB, so that there is no need to additionally add a new field to indicate the DM-RS pattern as in the prior art, so the pilot and control signaling are further reduced. s expenses.

Further, as shown in FIG. 8, in the present application, the pattern determining module 02 may further include a pattern density determining unit 021 and a pattern identifying unit 022; specifically:

The pattern density determining unit 021 is configured to determine a density of the corresponding DM-RS pattern of the MCS according to a mapping relationship between the MCS value and the DM-RS pattern density;

The pattern identifying unit 022 is configured to determine a corresponding DM-RS pattern of the RV by using a mapping relationship between the value of the RV and the DM-RS pattern.

Specifically, when the field RV is used in combination with the MCS, when the RS density corresponding to an MCS field includes multiple DM-RS patterns, the different values of the field RV may be used to determine the plurality of DM-RS patterns. First, the UE can accurately determine the required DM-RS pattern. For example, the DM-RS pattern shown in Figure 5 has the same density as the DM-RS pattern shown in Figure 4.

At this time, first, the pattern density determining unit 021 can determine the density of the corresponding DM-RS pattern of the MCS according to the mapping relationship between the MCS value and the DM-RS pattern density, and determine the density of the DM-RS pattern including FIG. 5. And Figure 2 two DM-RS patterns as an example; since two DM-RS patterns are included in the density, it is still impossible to accurately determine which DM-RS pattern the DM-RS pattern used on the UE should be. For this, further confirmation by the pattern identification unit 022 is required.

When the field RV=0, the pattern identifying unit 022 determines that the DM-RS pattern used on the UE should be the DM-RS pattern shown in FIG. 5 by the mapping relationship between the value of the RV and the DM-RS pattern; Including, when the field RV=1, the pattern identification unit 022 determines that the DM-RS pattern used on the UE should be as shown in FIG. 6 by the mapping relationship between the value of the RV and the DM-RS pattern. DM-RS pattern.

In the present application, the pattern determining module 02 includes a pattern density determining unit 021 and a pattern identifying unit 022, and may further include another embodiment;

The pattern density determining unit 021 determines the density of the corresponding DM-RS pattern according to the value of the NDI;

The pattern identifying unit 022 determines the DM-RS pattern corresponding to the RV by using the mapping relationship between the value of the RV and the DM-RS pattern.

The present embodiment is similar to the principle of the previous embodiment. When the pattern density determining unit 021 determines the density of the corresponding DM-RS pattern according to the value of the NDI, when a plurality of DM-RS patterns are included, the pattern can be passed. The identification unit 022 specifically determines which DM-RS pattern should be from the plurality of DM-RS patterns according to the value of the RV.

FIG. 9 is a DM-RS pattern indicating apparatus 11 according to another embodiment of the present invention. The DM-RS pattern indicating apparatus 22 includes: a specific field obtaining module 01, a pattern determining module 02, and a subsequent subframe number determining module 03; The specific field obtaining module 01 and the pattern determining module 02 have the same functions as the corresponding embodiments of FIG. 7 and FIG. 8. The fixed field obtaining module 01 and the pattern determining module 02 are not described in detail in this embodiment.

Taking the specific field obtained by the specific field acquisition module 01 as the MCS as an example, the specific field acquisition module 01 acquires the field MCS, and the pattern determination module 02 determines the corresponding DM-RS pattern used on the UE according to the value of the MCS.

Then, the subsequent subframe number determining module 03 obtains the number of subframes that can use the DM-RS pattern later by using the value of the field RV; for example, when the specific field obtaining module 01 in the UE obtains the field of the MCS information in the DCI, It is known that the MCS selected by the eNB is 10 to 16, thereby determining that the DM-RS pattern used on the UE should be the DM-RS pattern shown in FIG. 4, and further, the subsequent subframe number determining module 03 is based on the field RV. The value is used to determine the number of subframes in which the DM-RS pattern shown in FIG. 4 can be used later; the specific number of subsequent subframes may be the value of the RV itself. For example, when the value of the RV is equal to 0, the DM-RS pattern is only for the present version. The frame is valid; when the value of RV is equal to 1, the number of subsequent subframes can be lk; When the value of RV is equal to 2, the number of subsequent subframes may be 2k. In addition, the value of the RV may be multiplied by a preset value. For example, when the value of RV is equal to 1, the number of subsequent subframes may be lk. When the value of the RV is equal to 2, the number of subsequent subframes may be 2k, that is, the preset value may be set to lk; the determination of the preset value may be determined according to the needs of the actual application, and no specific numerical limitation is used herein.

The specific field obtained by the specific field obtaining module 01 is NDI, and the specific field obtaining module 01 obtains the field NDI, and the pattern determining module 02 determines the corresponding DM-RS pattern used on the UE according to the value of the NDI.

Then, the subsequent subframe number determining module 03 obtains the number of subframes that can subsequently use the DM-RS pattern by using the value of the field RV;

Here, the role and application principle of RV is similar to the combination of RV and MCS. The purpose is to use the same DM-RS pattern in a certain sub-frame, thus avoiding the frequent conversion of DM-RS patterns.

Further, corresponding to the method embodiment, the embodiment of the present invention further provides a user equipment 20, which is used to implement parsing of the DM-RS pattern indication of the eNB. As shown in FIG. 10, the user equipment 20 includes:

The receiver 2101 obtains a specific field in the downlink control information DCI; the specific field includes a field related to the quality of the downlink channel, or a field with a redundant state;

In an actual application, after the eNB sends the DCI to the UE, the receiver 2101 can acquire a specific field according to the DCI received by the UE. Since the user equipment also includes specific fields and The mapping relationship of the DM-RS patterns, therefore, the memory 2103 can determine the corresponding DM-RS pattern used on the UE according to the mapping relationship.

Specifically, the field related to the downlink channel quality in this application may specifically be MCS or NDI; the field including the redundancy status may be an RV field.

Further, in the embodiment of the present invention, the processor 2102 may be further configured to determine, according to the mapping relationship between the MCS value and the DM-RS pattern density, the density of the corresponding DM-RS pattern of the MCS; And determining, by using the mapping relationship between the value of the RV and the DM-RS pattern, the DM-RS pattern corresponding to the RV.

Similarly, in the embodiment of the present invention, the processor 2102 is further configured to determine a density of the corresponding DM-RS pattern according to the value of the NDI; and then, by using the value of the RV and the DM- The mapping relationship of the RS patterns determines the corresponding DM-RS pattern of the RV.

It can be seen from the above that in the process of reducing the pilot and control signaling overhead by reducing the reference signal, in the present application, the field in the DCI related to the downlink channel quality or including the redundant state is inferred. The DM-RS pattern selected by the eNB is outdated, so that it is not necessary to additionally add a new field to indicate the DM-RS pattern as in the prior art, so the overhead of pilot and control signaling is further reduced.

Further, in the embodiment of the present invention, the processor 2102 is further configured to obtain, according to the value of the field RV, the number of subframes that can be subsequently used by the DM-RS pattern. In the present application, the RV value is used to determine that the frame can be used subsequently. The number of subframes of the same DM-RS pattern, so that the same DM-RS pattern can be used in a certain subframe, thereby avoiding frequent conversion of the DM-RS pattern. It will be apparent to those skilled in the art that, for convenience and brevity of description, only the division of each functional module described above is exemplified. In practical applications, the above-mentioned function assignment can be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the system, device and unit described above, reference may be made to the corresponding process in the foregoing method embodiment, and no longer Narration.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise. The components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. The instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The method for switching user equipment provided by the embodiment of the present invention and including the source network design The apparatus, the user equipment, and the target wireless network control node are described in detail, but the description of the above embodiments is only for helping to understand the method of the present invention and its core idea, and should not be construed as limiting the present invention. Those skilled in the art will be able to devise variations or substitutions within the scope of the present invention within the scope of the present invention.

Claims

Rights request

1. A demodulation reference signal DM-RS pattern indication method, characterized in that it includes: obtaining a specific field in the downlink control information DCI; the specific field includes a field related to the downlink channel quality, or is redundant Status fields;

The DM-RS pattern used on the UE is determined according to the specific field.

2. The method according to claim 1, wherein the specific field includes: one or any combination of modulation coding scheme MCS, new data indication NDI or redundancy version RV.

3. The method according to claim 2, wherein when the specific field includes an MCS, determining the DM-RS pattern used on the UE according to the specific field includes: obtaining a DM-RS pattern based on the MCS. The mapping relationship between the value and the DM-RS pattern determines the DM-RS pattern corresponding to the MCS.

4. The method according to claim 2, wherein when the specific field includes NDI, determining the DM-RS pattern used on the UE according to the specific field includes: when the NDI indicates When retransmitting, use a DM-RS pattern with a density not less than that of the original DM-RS pattern for the retransmitted data;

When the NDI indicates new transmission, a DM-RS pattern with a smaller density than the original DM-RS pattern is used for the newly transmitted data.

5. The method according to claim 2, wherein when the specific field includes RV, determining the DM-RS pattern used on the UE according to the specific field includes:

According to the mapping relationship between the RV value and the DM-RS pattern, the DM-RS pattern corresponding to the RV is determined.

6. The method according to claim 2, characterized in that, when the specific field includes MCS and RV, determining the DM-RS pattern used on the UE according to the specific field includes: obtaining the DM-RS pattern according to the MCS. The mapping relationship between the value and the DM-RS pattern density determines the density of the DM-RS pattern corresponding to the MCS;

Through the mapping relationship between the RV value and the DM-RS pattern, in the DM-RS pattern of the determined density, the DM-RS pattern corresponding to the RV is determined.

7. The method according to claim 2, characterized in that when the specific field includes NDI and RV, determining the DM-RS pattern used on the UE according to the specific field includes: determining the density of the corresponding DM-RS pattern according to the value of the NDI;

Through the mapping relationship between the RV value and the DM-RS pattern, at the determined density

Among the DM-RS patterns, the DM-RS pattern corresponding to the RV is determined.

8. The method according to claim 3, characterized in that when the specific fields include MCS and RV, it also includes:

The number of subsequent subframes using the same DM-RS pattern is determined according to the value of the RV.

9. The method according to claim 4, characterized in that when the specific fields include NDI and RV, it also includes:

10. The method according to claim 8 or 9, characterized in that,

The number of subsequent subframes is the value of the RV, or the product of the value of the RV and a preset value.

11. A DM-RS pattern indicating device, characterized in that it includes:

A specific field acquisition module is used to acquire a specific field in the downlink control information DCI; the specific field includes a field related to downlink channel quality, or a field with a redundant state; a pattern determination module is used to determine the specific field according to the specific field. Field determination uses the corresponding DM-RS pattern on the UE.

12. The device according to claim 11, characterized in that the specific field includes: one or any combination of modulation coding scheme MCS, downlink allocation index NDI or redundancy version RV.

13. The device according to claim 12, wherein when the specific field includes MCS, the pattern determination module is used to:

According to the mapping relationship between the MCS value and the DM-RS pattern, the DM-RS pattern corresponding to the MCS is determined.

14. The device according to claim 12, wherein when the specific field includes NDI, the pattern determination module is used to:

When the NDI indicates retransmission, the usage density of the retransmitted data is not less than that of the original DM-RS DM-RS pattern of pattern density;

15. The device according to claim 12, characterized in that, when the specific field includes RV, the pattern determination module is configured to:

16. The device according to claim 12, wherein when the specific field includes MCS and RV, the pattern determination module includes:

The pattern density determination unit is used to determine the density of the DM-RS pattern corresponding to the MCS according to the mapping relationship between the MCS value and the density of the DM-RS pattern;

The pattern identification unit is configured to determine the DM-RS pattern corresponding to the RV among the DM-RS patterns of the determined density through the mapping relationship between the value of the RV and the DM-RS pattern.

17. The method according to claim 12, wherein when the specific fields include NDI and RV, the pattern determination module includes:

The pattern density determination unit is used to determine the density of the corresponding DM-RS pattern according to the value of the NDI;

18. The device according to claim 13, characterized in that, when the specific field includes MCS and RV, it further includes a subsequent subframe number determination module;

Used to determine the number of subsequent subframes using the same DM-RS pattern according to the value of the RV.

19. The device according to claim 14, characterized in that, when the specific field includes NDI and RV, it further includes a subsequent subframe number determination module;

20. The device according to claim 18 or 19, characterized in that,