CN113949484B

CN113949484B - Methods and devices for notifying and determining DMRS (demodulation reference signal) port or mapping relation

Info

Publication number: CN113949484B
Application number: CN202110749647.4A
Authority: CN
Inventors: 张淑娟; 陈艺戬; 李儒岳; 刘文豪
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-08-14
Filing date: 2015-09-25
Publication date: 2023-04-11
Anticipated expiration: 2035-09-25
Also published as: WO2017028673A1; CN113949484A

Abstract

The invention provides DMRS ports orA method and a device for notifying and determining a mapping relation are provided, wherein the method comprises the following steps: in a transmission mode, a sending end sends prompt information to a receiving end, the sending end indicates the DMRS port or the distribution information of the mapping relation through the indication information, and the indication information comprises at least one of the following information: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid The method solves the problem that the performance of the MU-MIMO system is affected due to low channel estimation performance caused by limited orthogonal DMRS ports and high MUI interference when the total number of MU-MIMO transmission layers is increased, increases the orthogonal DMRS ports for MU-MIMO transmission on the basis of improving the configuration flexibility of the base station during MU-MIMO transmission, effectively inhibits the MUI interference during channel estimation, and improves the channel estimation performance.

Description

Methods and devices for notifying and determining DMRS (demodulation reference signal) port or mapping relation

The application is a divisional application of Chinese patent application with the application number of ' 201510626635.7 ', the application date of ' 2015, 9 and 25 and is entitled ' method and device for informing and determining DMRS ports or mapping relationships '.

Technical Field

The invention relates to the field of communication, in particular to a method and a device for notifying and determining a DMRS port or a mapping relation.

Background

With the rapid development of communication technology and electronic technology, the number of antennas at the base station end is increasing, for example, in Full-dimensional Multiple-Input Multiple-Output technology (FD-MIMO) and high-frequency communication, the number of antennas at the base station end increases from 8 to 16,32,64 or even more, and at this time, due to the cost problem of the receiving end, the number of antennas does not increase with doubling, and meanwhile, a plurality of old receiving ends with small number of antennas exist under a Multi-antenna base station, and if the number of receiving ends of Multi-User Multiple-Input Multiple-Output technology (MU-User Multiple-Input Multiple-Output, MU-MIMO) increases asynchronously, the performance advantage that the number of antennas at the base station end increases greatly cannot be fully exerted. In order to fully exert the multi-antenna performance potential of the base station end and enhance the system capacity, the number of receiving ends and the number of layers of MU-MIMO communication need to be increased.

With the increase of the number of the receiving ends in the MU-MIMO, the total number of layers transmitted by the base station end increases, and meanwhile, due to the feedback delay and error of the receiving end, the base station end cannot perfectly and completely eliminate the inter-receiving-end Interference (Multi-User Interference, abbreviated as MUI) through the space diversity, so that the MUI Interference of the receiving end relatively increases. As shown in table 1, currently, in 2c and 2d of Downlink Control Information (DCI) under LTE-Rel12, a 2-layer orthogonal 2-layer pseudo-orthogonal MU-MIMO transmission method is supported by a joint coding result of table one layer number, port and scrambling code.

TABLE 1

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Under future FD-MIMO and high frequency, when the total number of MU-MIMO layers is greatly increased, the channel estimation performance becomes the main bottleneck of improving the MU-MIMO performance. Therefore, the DMRS ports for MU-MIMO communication need to be enhanced, for example, more orthogonal DMRS ports are supported, so that the channel estimation performance is improved, the MUI is effectively suppressed, and the performance of the MU-MIMO system is improved.

To increase the ports of orthogonal demodulation Reference signals (DMRSs) for MU-MIMO and support the dynamic switching of SU-MIMO/MU-MIMO, one way to achieve this is to expand table 1, i.e. to use more bits to represent the number of layers, ports, and joint coding of scrambling codes, and to support more DMRS ports of MU-MIMO receiving end to be orthogonal while supporting Single-User Multiple-Input Multiple-Output (SU-MIMO) or MU-MIMO dynamic switching. At this time, as the number of bits occupied by the joint coding increases, a new DCI mode needs to be added, and then a Transmission Mode (TM) is added, thereby increasing the complexity of the terminal. In addition, in actual scenes, the multi-layer MU-MIMO transmission has a certain proportion, and all scenes are informed by expanding the table 1 in DCI, thereby causing unnecessary waste of DCI resources.

Aiming at the problems that in the related art, after the total number of MU-MIMO transmission layers is increased, orthogonal DMRS ports for MU-MIMO are limited, and the channel estimation performance is not high due to high MUI interference, so that the performance of an MU-MIMO system cannot be fully exerted, no effective solution is provided at present.

Disclosure of Invention

The invention provides a method and a device for notifying and determining a DMRS port or a mapping relation, which are used for at least solving the problems that in the related technology, after the total number of MU-MIMO transmission layers is increased, orthogonal DMRS ports for MU-MIMO are limited, and the channel estimation performance is not high due to high MUI interference, so that the performance of an MU-MIMO system cannot be fully exerted.

According to an aspect of the present invention, a method for notifying a demodulation reference signal DMRS port is provided, including:

in a transmission mode, a sending end sends indication information to a receiving end, the sending end indicates the allocation information of the DMRS ports through the indication information, and the indication information comprises at least one of the following information: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid 。

Further, the sending end indicates, by using the indication information, the allocation information of the DMRS ports, including:

the sending end and the receiving end agree on N DMRS port groups, the sending end uses the RRC signaling or the physical layer NDI bit to indicate the DMRS port group allocation information, different indication information values indicated by the RRC signaling or the physical layer NDI bit correspond to different DMRS port groups, wherein the DMRS ports in the DMRS port groups have different sequences and correspond to different port groups, and N is a positive integer greater than 1.

and the sending end indicates the port allocation information in the DMRS port group through a port allocation signaling of a physical layer.

Further, the transmitting end indicates, through the indication information, the allocation information of the DMRS ports, including:

the sending end notifies the DMRS port allocation information and M-1 other information in a mode of M information joint coding, wherein M is a positive integer, and the M-1 other information comprises at least one of the following information: DMRS pilot scrambling configuration information n _scid Information, layer number indication information of a receiving end;

when the number of layers is r, the transmitting end and the receiving end agree on N N _scid Corresponding to N different DMRS port groups, wherein r is 1 or 2,N is a positive integer greater than 1.

the transmitting end informs the receiving end of the n _scid And whether the corresponding relation with the DMRS port group is enabled or not, and further indicating the allocation information of the DMRS ports, wherein the indication information of whether the corresponding relation is enabled or not is notified by one or more of the following modes: informed by high-level signaling; NDI notification by transport block; fixed enable, N times _scid Binding a value and N DMRS port groups during joint coding, wherein N is a positive integer greater than 1;

said receiving end said n _scid N when the correspondence with the DMRS port group is enabled _scid Values correspond to N DMRS port groups; said receiving end said n _scid When the correspondence with the DMRS port group is not enabled, n _scid There is no correspondence with the DMRS port group.

Further, said n _scid And when the corresponding relation with the DMRS port group is enabled, the initialization value of the DMRS random sequence is obtained based on the following formula:

wherein n is _s Is the number of the sub-frame,

f(n _scid ) E {0,1} or f (n) _scid ) E {0,1,2,3}, where n _scid E {0,1,2,3} represents the scrambling code ID, where ^ er>

Is the virtual cell ID, g (n), used by the terminal for DMRS demodulation _SCID ) Is n _SCID The correction value of (2).

Further, the air conditioner is provided with a fan,

the candidate value of (2) is notified by a high-level signaling, and the high-level signaling configures different candidate values for different code numbers.

Further, reference is made to the number of codewords currently transmitted and or the configuration of higher layer signaling, which is used to calculate c _init F (n) of _SCID ) The correction is one of the following modes:

f(n _SCID )＝xor(f(n _SCID ),1)；

f(n _SCID )＝k，k∈{0,1}。

further, reference is made to the number of codewords currently transmitted and or the configuration of higher layer signaling, which is used to calculate c _init G (n) of _SCID ) The correction is one of the following modes:

g(n _SCID )＝xor(g(n _SCID ),1)；

g(n _SCID )＝k，k∈{0,1}。

further, when only one codeword is transmitted, different NDI values of the non-enabled codeword indicate different DMRS port groups, and at this time, the number of DMRS port groups is equal to the number of different NDI values; when two code words are transmitted, different n _ scid values in the DCI indicate different DMRS port groups, and the number of the DMRS port groups is equal to the number of the different n _ scid values.

According to another aspect of the present invention, there is also provided a method for notifying a mapping relationship, including: in a transmission mode, a sending end sends a notification message to a receiving end, the receiving end selects a mapping relation from a plurality of mapping relations according to the notification message, wherein the mapping relation refers to a mapping relation between a joint coding domain value set and a joint coding content set, and the sending method of the notification message comprises at least one of the following modes:

notification by radio resource control, RRC, signaling;

indicating NDI notification by new data of the transport block;

notification of redundancy versions by transport blocks;

notifying by 1 or more bits in a hybrid automatic repeat request, HARQ, process number bit field;

the transport block modulation and coding strategy MCS bit field is signaled in 1 or more bits.

Further, the method further comprises:

and when the bit number indicating the mapping relation is less than the bit number in the bit field, the bit indicating the mapping relation occupies 1 or more Least Significant Bit (LSB) bits of the bit field.

Further, the notifying of the different mapping relationships by a new data indication NDI of a transport block includes:

under the condition that a downlink control message DCI notification has an incapability transmission block, indicating different mapping relations by different values of NDI of the incapability transmission block;

indicating that the different mapping relationship includes one of the following when no transport block is not enabled in the downlink DCI notification: fixedly selecting a mapping relation; selecting any one of the N mapping relations; indicating different mapping relationships using the NDI of the first enabled transport block; indicating a different mapping relationship using the NDI of the second enabled transport block; different mapping relationships are jointly indicated using NDI of all enabled transport blocks.

Further, the joint encoding of the joint encoding domain comprises one of:

the joint coding is DMRS port of the receiving end, number of physical downlink shared channel PDSCH layers of the receiving end, scrambling code n of the DMRS port of the receiving end _scid Joint coding of the three;

the joint coding is DMRS port of the receiving end, PDSCH layer number of the receiving end, scrambling code n of the DMRS port of the receiving end _scid And joint coding of the DMRS power of the receiving end.

Further, the joint coding represents the DMRS port of the receiving end, the number of PDSCH layers of the receiving end and the scrambling code n of the DMRS port of the receiving end _scid In the case of the joint coding of the three, the joint coding content indicates the DMRS port value of the receiving end, the PDSCH layer value of the receiving end, and the DMRS port scrambling code n of the receiving end _scid A combination of values, all possible combinations of the three constituting a joint coded content ensemble;

the joint coding represents the DMRS port of the receiving end, the number of PDSCH layers of the receiving end and the scrambling code n of the DMRS port of the receiving end _scid And under the condition of the joint coding of the DMRS power of the receiving end, the joint coding content represents the DMRS port value of the receiving end, the PDSCH layer value of the receiving end, and the DMRS port scrambling code n of the receiving end _scid A combination of values, all possible combinations of said four constituting said joint encoded content ensemble.

Further, the mapping relationship between the set of values of the joint coding domain and the set of joint coded content satisfies at least one of the following characteristics:

the bit numbers of the joint coding domains corresponding to different mapping relations are the same;

the same bit value of the joint coding domain corresponding to one transmission block and two transmission blocks is regarded as two different values;

the mapping relation is a one-to-one corresponding mapping relation, a numerical value set of a joint coding domain in one mapping relation is a subset of the total set of joint coding numerical values, and a coding content set in one mapping relation is a subset of the total set of coding content;

the joint coding contents represented by the same value of the joint coding field in different mapping relations are the same or different.

The different mapping relations and the number of the mapping relations are known in advance by the receiving end and the sending end;

the mapping relation indication information and the mapping relation are in a correspondence relation agreed by the receiving end and the transmitting end in advance.

According to another aspect of the present invention, there is also provided a method for determining a demodulation reference signal DMRS port, including:

in a transmission mode, a receiving end receives indication information sent by a sending end, the receiving end determines a DMRS port used by a current subframe of the receiving end for data demodulation according to the indication information, and the indication information includes at least one of the following information: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid 。

Further, the determining, by the receiving end through the indication information, the DMRS port used by the current subframe of the receiving end for data demodulation includes:

the sending end and the receiving end agree on N DMRS port groups, N is greater than 1 and N is a positive integer, and the receiving end obtains the DMRS port groups of the receiving end through one or more of the following information:

the receiving end acquires DMRS port group information through RRC signaling;

the receiving end is according to n _scid Determining DMRS port group information;

the receiving end acquires DMRS port group information through NDI signaling;

the receiving end is according to n _scid And n _scid Determining DMRS port group information together with DMRS port group mapping enable/disable information;

after the receiving end obtains the DMRS port group information, the receiving end further determines, by combining with the intra-group DMRS port configuration information of the physical layer signaling, a DMRS port used by the current subframe for data demodulation.

wherein n is _s Is the number of the sub-frame,

Further, the air conditioner is provided with a fan,

f(n _SCID )＝xor(f(n _SCID ),1)；

f(n _SCID )＝k，k∈{0,1}。

g(n _SCID )＝xor(g(n _SCID ),1)；

g(n _SCID )＝k，k∈{0,1}。

According to another aspect of the present invention, there is also provided a method for determining a mapping relationship, including:

in a transmission mode, a receiving end receives a notification message sent by a sending end, the receiving end selects a mapping relation from a plurality of mapping relations according to the notification message, the mapping relation refers to a mapping relation between a value set of a joint coding domain and a joint coding content set, the selected mapping relation is referred to according to the value of the joint coding domain to obtain the joint coding content, and the notification message comprises at least one of the following messages:

radio resource control, RRC, signaling;

new data indication NDI of the transport block;

a redundancy version of the transport block;

1 or more bits in a hybrid automatic repeat request, HARQ, process number bit field;

1 or more bits in the transport block MCS bit field.

Further, the method further comprises:

Further, the joint encoding of the joint encoding domain comprises one of:

Further, the joint coding represents the DMRS port of the receiving end, the number of PDSCH layers of the receiving end and the scrambling code n of the DMRS port of the receiving end _scid Under the condition of the joint coding of the three, the joint coding content represents the DMRS port value of the receiving end, the PDSCH layer value of the receiving end and the DMRS port scrambling code n of the receiving end _scid A combination of values, all possible combinations of the three constituting a joint coded content ensemble;

the joint code represents the DMRS port of the receiving end, the number of PDSCH layers of the receiving end and the scrambling code n of the DMRS port of the receiving end _scid And under the condition of the joint coding of the DMRS power of the receiving end, the joint coding content represents the DMRS port value of the receiving end, the PDSCH layer value of the receiving end, and the DMRS port scrambling code n of the receiving end _scid A combination of values, all possible combinations of said four constituting said joint encoded content ensemble.

Further, the mapping relationship between the set of values of the joint coding field and the set of joint coded content satisfies at least one of the following characteristics:

the joint coding contents expressed by the same value of the joint coding domain in different mapping relations are the same or different;

different mapping relations and the number of the mapping relations are known in advance by the receiving end and the transmitting end;

According to another aspect of the present invention, there is also provided an apparatus for notifying a DMRS port of a demodulation reference signal, where the apparatus is located at a transmitting end, and the apparatus includes:

a first sending module, configured to send, by a sending end, indication information to a receiving end in a transmission mode, where the sending end indicates allocation information of a DMRS port through the indication information, and the indication information includes at least one of the following information: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid 。

wherein n is _s Is the number of the sub-frame,

Further, the air conditioner is characterized in that,

f(n _SCID )＝xor(f(n _SCID ),1)；

f(n _SCID )＝k，k∈{0,1}。

g(n _SCID )＝xor(g(n _SCID ),1)；

g(n _SCID )＝k，k∈{0,1}。

According to another aspect of the present invention, there is also provided a mapping relationship notification apparatus, located at a sending end, including:

a second sending module, configured to send a notification message to a receiving end in a transmission mode, where the receiving end selects a mapping relationship from multiple mapping relationships according to the notification message, where the mapping relationship refers to a mapping relationship between a joint coding domain value set and a joint coding content set, and the sending method of the notification message includes at least one of the following manners:

notification by radio resource control, RRC, signaling;

indicating an NDI notification by new data of a transport block;

notification of redundancy version by transport block;

According to another aspect of the present invention, there is also provided an apparatus for determining a DMRS port for demodulation reference signals, at a receiving end, the apparatus including:

a first receiving module, configured to, in a transmission mode, receive indication information sent by a sending end by a receiving end, where the receiving end determines, through the indication information, a DMRS port used by a current subframe of the receiving end for data demodulation, and the indication information includes at least one of the following information: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid 。

wherein n is _s Is the number of the sub-frame,

Further, the air conditioner is provided with a fan,

the candidate value is informed by a high-level signaling, and the high-level signaling configures different candidate selections aiming at different code numbersThe value is obtained.

f(n _SCID )＝xor(f(n _SCID ),1)；

f(n _SCID )＝k，k∈{0,1}。

g(n _SCID )＝xor(g(n _SCID ),1)；

g(n _SCID )＝k，k∈{0,1}。

According to another aspect of the present invention, there is also provided an apparatus for determining a mapping relationship, which is located at a receiving end, and includes:

a second receiving module, configured to, in a transmission mode, receive a notification message sent by a sending end, where the receiving end selects a mapping relationship from multiple mapping relationships according to the notification message, where the mapping relationship refers to a mapping relationship between a value set of a joint coding domain and a joint coding content set, and obtains a joint coding content according to a value of the joint coding domain by referring to the selected mapping relationship, where the notification message includes at least one of the following information:

radio resource control, RRC, signaling;

new data indication NDI of the transport block;

a redundancy version of the transport block;

1 or more bits in the transport block MCS bit field.

Through the invention, in a transmission mode, a sending end sends indication information to a receiving end, the sending end indicates the DMRS port or the distribution information of the mapping relation through the indication information, and the indication information comprises at least one of the following information: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid The invention solves the problems that after the total number of MU-MIMO transmission layers is increased, orthogonal DMRS ports for MU-MIMO transmission are limited, and high MUI causes low channel estimation performance, thereby affecting the performance of the MU-MIMO system.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a flowchart of a method for notifying a demodulation reference signal DMRS port according to an embodiment of the present invention;

FIG. 2 is a flowchart of a method for notifying mapping relationships according to an embodiment of the present invention;

fig. 3 is a flowchart of a method for determining a DMRS port of a demodulation reference signal according to an embodiment of the present invention;

FIG. 4 is a flow chart of a method for determining a mapping relationship according to an embodiment of the invention;

fig. 5 is a block diagram of a structure of a notification apparatus for a demodulation reference signal DMRS port according to an embodiment of the present invention;

fig. 6 is a block diagram of a notification apparatus of a mapping relationship according to an embodiment of the present invention;

fig. 7 is a block diagram illustrating a structure of a device for determining a DMRS port for a demodulation reference signal according to an embodiment of the present invention;

fig. 8 is a block diagram of a mapping relation determining apparatus according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In this embodiment, a method for notifying a demodulation reference signal DMRS port is provided, and fig. 1 is a flowchart of a method for notifying a demodulation reference signal DMRS port according to an embodiment of the present invention, where as shown in fig. 1, the flowchart includes the following steps:

step S102, in a transmission mode, a sending end sends indication information to a receiving end, the sending end indicates the distribution information of the DMRS port through the indication information, and the indication information includes at least one of the following: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid ；

Through the above steps, in a transmission mode, a transmitting end transmits indication information to a receiving end, the transmitting end indicates allocation information of a DMRS port through the indication information, and the indication information includes at least one of the following: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid The method solves the problems that when the total number of MU-MIMO layers is increased, orthogonal DMRS ports for MU-MIMO transmission are limited, and the performance of the MU-MIMO system is influenced due to low channel estimation performance caused by high MUI interference.

In this embodiment, the sending end and the receiving end agree on N DMRS port groups, the sending end uses the RRC signaling or the physical layer NDI bit to indicate the DMRS port group allocation information, different indication information values indicated by the RRC signaling or the physical layer NDI bit correspond to different DMRS port groups, where DMRS ports in the DMRS port groups have different sequences and correspond to different port groups, and N is a positive integer greater than 1.

In this embodiment, the sending end may indicate port allocation information in the DMRS port group through a port allocation signaling of a physical layer.

In this embodiment, the sending end notifies the DMRS port allocation information and M-1 other information in a manner of joint coding of M information, where M is a positive integer, and the M-1 other information includes at least one of the following information: DMRS pilot scrambling configuration information n _scid Information, layer number indication information of a receiving end;

when the number of layers is r, the transmitting end and the receiving end appoint N N _scid Corresponding to N different DMRS port groups, wherein r is 1 or 2,N is a positive integer greater than 1.

In this embodiment, the sending end indicates, by using the indication information, allocation information of the DMRS ports, including:

the transmitting end informs the receiving end of the n _scid And whether the corresponding relation with the DMRS port group is enabled or not is judged, and then the allocation information of the DMRS ports is indicated, and whether the indication information is enabled or not is notified through one or more of the following modes: informed by high-level signaling; NDI notification by transport block; fixed enable, N times _scid And binding the values with N DMRS port groups during joint coding, wherein N is a positive integer greater than 1.

The receiving end is n _scid N when the correspondence with the DMRS port group is enabled _scid Values correspond to N DMRS port groups; the receiving end is n _scid When the corresponding relation with the DMRS port group is not enabled, n _scid There is no correspondence with the DMRS port group.

In this embodiment, a method for notifying a mapping relationship is provided, and fig. 2 is a flowchart of a method for notifying a mapping relationship according to an embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:

step S202, in a transmission mode, a sending end sends a notification message to a receiving end, the receiving end selects a mapping relation from a plurality of mapping relations according to the notification message, wherein the mapping relation refers to a mapping relation between a joint coding domain value set and a joint coding content set, and the sending method of the notification message comprises at least one of the following modes:

informed by high-level signaling;

indicating NDI notification by new data of the transport block;

notification of redundancy versions by transport blocks;

Through the steps, in a transmission mode, a sending end sends a notification message to a receiving end, and the receiving end selects one mapping relation from a plurality of mapping relations according to the notification message, wherein the mapping relation refers to the mapping relation between a joint coding domain value set and a joint coding content set, so that the problem that when the total number of MU-MIMO layers is increased, orthogonal DMRS ports for MU-MIMO transmission are limited, and the channel estimation performance is not high due to high MUI interference, so that the MU-MIMO system performance is influenced is solved.

In this embodiment, when the number of bits indicating the mapping relation is less than the number of bits in the bit field, the bits indicating the mapping relation occupy 1 or more least significant bits LSB of the bit field.

In this embodiment, in the case that there is an un-enabled transport block in the DCI notification of the downlink control message, different values of the NDI of the un-enabled transport block indicate different mapping relationships;

in case that no transport block is not enabled in the downlink DCI notification, indicating that the different mapping relationship includes one of: fixedly selecting a mapping relation; selecting any one of the N mapping relations; indicating different mapping relationships using the NDI of the first enabled transport block; indicating a different mapping relationship using the NDI of the second enabled transport block; different mapping relationships are jointly indicated using NDI of all enabled transport blocks.

In this embodiment, the joint coding of the joint coding field includes one of:

the joint coding is DMRS port of the receiving end, the number of PDSCH layers of the physical downlink shared channel of the receiving end, and scrambling code n of the DMRS port of the receiving end _scid Joint coding of the three;

In this embodiment, the joint coding indicates the DMRS port of the receiving end, the number of PDSCH layers of the receiving end, and the scrambling code n of the DMRS port of the receiving end _scid In the case of the joint coding of the three, the joint coding content indicates the DMRS port value of the receiving end, the PDSCH layer value of the receiving end, and the DMRS port scrambling code n of the receiving end _scid Value composition, all possible combinations of the three form a joint coding content aggregate;

the joint coding represents the DMRS port of the receiving end, the PDSCH layer number of the receiving end and the scrambling code n of the DMRS port of the receiving end _scid And in the case of the joint coding of the DMRS power of the receiving end, the joint coding content indicates the DMRS port value of the receiving end, the PDSCH layer value of the receiving end, and the DMRS port scrambling code n of the receiving end _scid Combinations of values, all possible combinations of the four constituting the joint encoded content ensemble.

In this embodiment, the mapping relationship between the value set of the joint coding field and the joint coding content set satisfies at least one of the following characteristics:

the same bit value of the joint coding field corresponding to one transmission block and two transmission blocks is regarded as two different values, i.e. the total set of joint coding values is 2 ^m+1 Each element being { a value of 0 to 2 corresponding to one transport block } ^m -1, the values 0-2 for two transport blocks ^m -1, where m represents the number of bits occupied by the joint coding field;

the mapping relation is a one-to-one corresponding mapping relation, a numerical value set of a joint coding domain in one mapping relation is a subset of the total set of the joint coding numerical values, and a coding content set in one mapping relation is a subset of the total set of the coding content;

the mapping relationship indication information and the mapping relationship are pre-agreed by the receiving end and the transmitting end.

In this embodiment, a method for determining a DMRS port is provided, and fig. 3 is a flowchart of a method for determining a DMRS port according to an embodiment of the present invention, where as shown in fig. 3, the flowchart includes the following steps:

step S302, in a transmission mode, a receiving end receives indication information sent by a sending end, and the receiving end determines, through the indication information, a DMRS port used by a current subframe of the receiving end for data demodulation, where the indication information includes at least one of: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid 。

Through the above steps, in a transmission mode, a receiving end receives indication information sent by a sending end, and the receiving end determines a DMRS port used for data demodulation by the receiving end in a current subframe according to the indication information, where the indication information includes at least one of: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRSPilot scrambling configuration information n _scid The method solves the problems that when the total number of MU-MIMO layers is increased, orthogonal DMRS ports for MU-MIMO transmission are limited, and the performance of the MU-MIMO system is affected due to low channel estimation performance caused by high MUI interference.

In this embodiment, the sending end and the receiving end agree on N DMRS port groups, where N >1 and N is a positive integer, and the receiving end obtains the DMRS port group of the receiving end through one or more of the following information:

the receiving end acquires DMRS port group information through RRC signaling;

the receiving end acquires DMRS port group information through NDI signaling;

after the receiving end obtains the DMRS port group information, the receiving end further determines, in combination with the intra-group DMRS port configuration information of the physical layer signaling, a DMRS port used by the current subframe for data demodulation.

In this embodiment, a method for determining a mapping relationship is provided, and fig. 4 is a flowchart of a method for determining a mapping relationship according to an embodiment of the present invention, as shown in fig. 4, the flowchart includes the following steps:

step S402, in a transmission mode, a receiving end receives a notification message sent by a sending end, the receiving end selects a mapping relation from a plurality of mapping relations according to the notification message, the mapping relation refers to a mapping relation between a value set of a joint coding domain and a joint coding content set, and the joint coding content is obtained according to the value of the joint coding domain and by referring to the selected mapping relation, the notification message includes at least one of the following information:

high-level signaling;

new data indication NDI of the transport block; a redundancy version of the transport block;

1 or more bits in the transport block MCS bit field.

Through the steps, in a transmission mode, a receiving end receives a notification message sent by a sending end, the receiving end selects a mapping relation from a plurality of mapping relations according to the notification message, the mapping relation refers to the mapping relation between a value set and a combined coding content set of a combined coding domain, and the problem that when the total number of MU-MIMO layers is increased, orthogonal DMRS ports for MU-MIMO transmission are limited, and channel estimation performance is not high due to high MUI interference, so that MU-MIMO system performance is affected is solved.

In this embodiment, when the number of bits indicating the mapping relationship is less than the number of bits in the bit field, the bits indicating the mapping relationship occupy 1 or more LSB bits of the bit field.

In this embodiment, the joint coding of the joint coding field includes one of:

In this embodiment, the joint coding indicates the DMRS port on the receiving side, the number of PDSCH layers on the receiving side, and the scrambling code n of the DMRS port on the receiving side _scid In the case of joint coding of the three, the joint coding content indicates the DMRS port value of the receiving end, and the receiving endPDSCH layer value, DMRS port scrambling code n of the receiving end _scid The value composition, all possible combinations of the three form a joint coding content aggregate;

the joint coding represents the DMRS port of the receiving end, the PDSCH layer number of the receiving end and the scrambling code n of the DMRS port of the receiving end _scid And under the condition of the joint coding of the DMRS power of the receiving end, the joint coding content indicates the DMRS port value of the receiving end, the PDSCH layer numerical value of the receiving end and the DMRS port scrambling code n of the receiving end _scid Combinations of values, all possible combinations of the four constituting the joint encoded content ensemble.

the joint coding contents of the same value of the joint coding field expressed in different mapping relations are the same or different, namely 2 is in the total set of the joint coding values ^m+1 Each element being { a value of 0 to 2 corresponding to one transport block } ^m -1, two transport blocks correspond to values 0-2 ^m -1, where m represents the number of bits occupied by the jointly coded field.

In this embodiment, a device corresponding to the method is further provided, and the device is used to implement the above embodiments and preferred embodiments, and the description of the device that has been already described is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware or a combination of software and hardware is also possible and contemplated.

Fig. 5 is a block diagram of a structure of an apparatus for notifying of a DMRS port of a demodulation reference signal according to an embodiment of the present invention, where as shown in fig. 5, the apparatus is located at a transmitting end, and the apparatus includes:

a first sending module 52, configured to send, in a transmission mode, a prompt message to a receiving end by a sending end, where the sending end indicates, through the indication message, allocation information of a DMRS port, where the indication message includes at least one of the following information: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid 。

Fig. 6 is a block diagram of a structure of an apparatus for notifying a mapping relationship according to an embodiment of the present invention, and as shown in fig. 6, the apparatus is located at a sending end, and the apparatus includes:

a second sending module 62, configured to send, in a transmission mode, a notification message to a receiving end, where the receiving end selects a mapping relationship from multiple mapping relationships according to the notification message, where the mapping relationship refers to a mapping relationship between a joint coding domain value set and a joint coding content set, and a sending method of the notification message includes at least one of the following manners:

informed by high-level signaling;

indicating NDI notification by new data of the transport block;

notification of redundancy versions by transport blocks;

Fig. 7 is a block diagram of a structure of an apparatus for determining a DMRS port for a demodulation reference signal according to an embodiment of the present invention, where the apparatus is located at a receiving end, as shown in fig. 7, and the apparatus includes:

a first receiving module 72, configured to, in a transmission mode, receive indication information sent by a sending end, where the receiving end determines, by using the indication information, a DMRS port used by a current subframe of the receiving end for data demodulation, where the indication information includes at least one of: radio resource control, RRC, signaling; a physical layer New Data Indication (NDI) bit; DMRS pilot scrambling configuration information n _scid 。

Fig. 8 is a block diagram of a mapping relationship determining apparatus according to an embodiment of the present invention, and as shown in fig. 8, the apparatus is located at a receiving end, and includes:

a second receiving module 82, configured to, in a transmission mode, receive a notification message sent by a sending end, where the receiving end selects a mapping relationship from multiple mapping relationships according to the notification message, where the mapping relationship refers to a mapping relationship between a value set of a joint coding domain and a joint coding content set, and obtains the joint coding content according to the value of the joint coding domain and by referring to the selected mapping relationship, where the notification message includes at least one of the following information:

high-level signaling;

1 or more bits in the transport block MCS bit field.

In the above embodiment, n is _scid And when the corresponding relation with the DMRS port group is enabled, the initialization value of the DMRS random sequence is obtained based on the following formula:

wherein n is _s Is the number of the sub-frame,

f(n _scid ) E {0,1} or f (n) _scid ) E {0,1,2,3}, whereinn _scid E {0,1,2,3} represents the scrambling code ID, where ^ er>

In the present embodiment, it is preferred that,

In this embodiment, reference is made to the number of codewords currently transmitted and or the configuration of higher layer signaling, which is used to calculate c _init F (n) of _SCID ) The correction is one of the following modes:

f(n _SCID )＝xor(f(n _SCID ),1)；

f(n _SCID )＝k，k∈{0,1}。

in this embodiment, reference is made to the number of codewords currently transmitted and or the configuration of higher layer signaling, which is used to calculate c _init G (n) of _SCID ) The correction is one of the following modes:

g(n _SCID )＝xor(g(n _SCID ),1)；

g(n _SCID )＝k，k∈{0,1}。

in the above embodiment, when only one codeword is transmitted, different NDI values of the non-enabled codeword indicate different DMRS port groups, where the number of DMRS port groups is equal to the number of different NDI values; when two code words are transmitted, different n _ scid values in the DCI indicate different DMRS port groups, and the number of the DMRS port groups is equal to the number of the different n _ scid values;

the present invention will be described in detail with reference to preferred examples and embodiments;

preferred embodiment 1

In the preferred embodiment, the transmitting end indicates the receiving end to be 2 through high-level n-bit signaling ⁿ A selection is made among the mapping relationships. Assuming that n =1, the higher layer signaling value of 0 indicates receiver selectionAnd the first mapping relation indicates that the receiving end selects the second mapping relation when the high-level signaling value is 1. The mapping relation is shown in table 1, and at this time, the joint coding value 7 corresponding to one transmission block does not have a coding content corresponding thereto, and does not belong to the joint coding value set in the mapping relation as a reservation, that is, the joint coding value set corresponding to the mapping relation is composed of 13 values in total, namely { a value 0-6 corresponding to one transmission block, and 0-7 corresponding to two transmission blocks }, and the joint coding content set in the mapping relation is composed of 13 elements in total, in which the joint coding content corresponding to each value in the joint coding value set shown in table 1 is composed of 13 elements in total. The second mapping relationship is shown in table 2.

The receiving end is at 2 according to n bit high layer signaling ⁿ A selection is made from the mapping relationships. Specifically, in the preferred embodiment, if the bit value of the 1 bit received by the receiving end in the high-level signaling is 0, a mapping relation one, that is, table 1, is selected, and then the table 1 is referred to, and the joint coding content is obtained according to the received numerical value of the joint coding domain; if the bit value of the received high-level signaling 1 is 1, the receiving end selects a mapping relation II, namely the table 2, and then obtains the joint coding content according to the received numerical value of the joint coding domain by referring to the table 2.

In the preferred embodiment, the joint coding is the joint coding of the number of layers of the receiving end, the DMRS port and the scrambling code ID nSCID corresponding to the DMRS port.

TABLE 1

TABLE 2

The item not labeled nSCID in table 1 and table 2 indicates nSCID =0. In the preferred embodiment, different mapping relationships are allocated to different receiving ends through high-level signaling, so that more MU-MIMO DMRS ports of the receiving ends are orthogonal.

For example, in MU-MIMO transmission, each receiving end transmits one layer, table 1 is allocated to receiving ends 1 to 2, table 2 is allocated to receiving ends 3 to 4, 7 ports (i.e., 0 value for one transmission block in table 1), 8 ports (i.e., 2 values for one transmission block in table 1), 11 ports (i.e., 0 value for one transmission block in table 2), and 13 ports (i.e., 2 values for one transmission block in table 2) are sequentially allocated to receiving ends 1 to 4, so that DMRS ports of 4 receiving ends are orthogonal.

If each receiving end has a layer of 1, allocating a table 1 to the receiving ends 1 to 4, allocating a table 2 to the receiving ends 5 to 8, and allocating DMRS ports 7n to the receiving ends 1 to 4 in sequence _scid =0,DMRS port 8n _scid =0,DMRS port 7n _scid =1,dmrs port 8,n _scid =1, which in turn corresponds to the 0-3 values of one transport block in table 1; DMRS ports 11n are sequentially distributed to receiving ends 5-8 _scid =0,dmrs port 13n _scid =0,dmrs port 11n _scid =1,dmrs port 13,n _scid =1, which in turn corresponds to the 0-3 values of one transport block in table 2; 4-layer orthogonal 4-layer pseudo-orthogonal MU-MIMO transmission is supported in this manner.

If each receiving end is distributed with 2 layers, then distributing a table 1 to the receiving ends 1-2, distributing a table 2 to the receiving ends 3-4, and sequentially distributing 0-1 values corresponding to 2 transmission blocks in the table 1 to the receiving ends 1-2; and (3) values 0-1 corresponding to 2 transmission blocks in the table 2 are sequentially distributed to the receiving ends 3-4, so that 4-layer orthogonal 4-layer pseudo-orthogonal MU-MIMO transmission can be achieved.

In summary, by the method of the preferred embodiment, each receiving end has 1 layer or 2 layers, and total 8 layers of MU-MIMO transmission are achieved, wherein 8 DMRS ports have 2 pseudo-orthogonal groups, and each pseudo-orthogonal group has 4 orthogonal DMRS ports.

Note that when it is SU-MIMO transmission, if it is 1 layer, any one of DMRS ports {7,8,11,13} is equivalent in effect; if the port is equivalent to a 2-layer {7,8} port and a {11,13} port; corresponding to more than 2 layers, the items in the 2 tables are the same, so that the updating period of the high-level indication parameters can be longer, and the method can also adapt to the dynamic switching of SU-MIMO/MU-MIMO transmission.

In the above manner, the situation of continuously keeping one transport block corresponding to 2,3,4 layers in the existing 212 protocol is only suitable for the initial transmission.

In the preferred embodiment, tables 1 and 2 are the case of 3 bits in the joint coding field, and the preferred embodiment does not limit other joint coding value sets and joint coding content sets.

Preferred embodiment two

In the preferred embodiment, the transmitting end indicates the receiving end to be 2 through high-level n-bit signaling ⁿ A selection is made from the mapping relationships. Assuming that n =1, the mapping relationship one is shown in table 3, and the mapping relationship two is shown in table 4.

The receiving end is at 2 according to n bit high layer signaling ⁿ A selection is made among the mapping relationships. Specifically, in the preferred embodiment, if the bit value of the 1 bit received by the receiving end in the high-level signaling is 0, a mapping relation one, that is, table 3, is selected, and then the table 3 is referred to, and the joint coding content is obtained according to the received numerical value of the joint coding domain; if the bit value of the received high-level signaling 1 is 1, the receiving end selects a mapping relation II, namely the table 4, and then obtains the joint coding content according to the received numerical value of the joint coding domain by referring to the table 4.

In this preferred embodiment, the joint coding is a joint coding of four of the number of layers of the receiving end, DMRS ports, scrambling codes ID nSCID corresponding to the DMRS ports, and DMRS power of the receiving end.

TABLE 3

TABLE 4

In tables 3 and 4, P denotes a power difference between the DMRS and the PDSCH of the receiving end. The item receiving end which is not marked with nSCID in the tables 3 and 4 determines the power difference between the DMRS and the PDSCH according to the number of layers, namely the number of layers is less than or equal to 2, the power difference between the DMRS and the PDSCH is 0dB, the number of layers is more than 2, and the power difference between the DMRS and the PDSCH is 3dB. The term labeled nSCID derives the power difference between DMRS and PDSCH from the P value. Where { A, B, C, D, A1, B1, C1, D1} is a fixed value.

At this time, table 4 may be allocated to the receiving end with poor channel quality or less number of antennas at the receiving end; table 3 is assigned to the receiving end having good channel quality or a large number of receiving antennas. In this way, more pseudo-orthogonal groups can be realized, that is, up to 4 pseudo-orthogonal groups, with 4 orthogonal DMRS ports {7,8,11,13} in each pseudo-orthogonal group. I.e. up to 16 DMRS pseudo-orthogonal DMRS ports are implemented for MU-MIMO transmission. The DMRS pilot power is adjusted in tables 3 and 4 at the same time to improve the pilot power when the total number of layers of MU-MIMO transmission increases, thereby improving the channel estimation performance. Meanwhile, when table 4 is used, the restriction that the 5-6 value of one transport block in the existing 212 protocol is only used for first transmission is cancelled.

For example, table 3 is allocated to the receiving terminals 1 to 2, table 4 is allocated to the receiving terminals 7 to 8, then the receiving terminals 1 to 2 are sequentially allocated with values 0 to 1 corresponding to the two transport blocks in table 3, and the receiving terminals 3 to 8 are sequentially allocated with values {0,1,4 to 7} corresponding to the two transport blocks in table 4.

In another implementation manner of the preferred embodiment, the second mapping relationship is shown in table 5:

TABLE 5

The entries not labeled nSCID in table 3, table 4, and table 5 indicate nSCID =0.

Table 5 can support an increase in the number of layers for user transmission compared to table 4, so that the update period of the higher layer signaling can be relatively lengthened.

Preferred embodiment three

In this preferred embodiment, the sending end indicates the receiving end to select in different mapping relationships through the NDI of the transport block in the DCI command:

in the preferred embodiment, if the receiving end receives only one enabled transport block in the DCI and one disabled transport block, the receiving end selects the mapping relationship table according to the NDI value of the disabled transport block, where the NDI value is 0, and the receiving end selects table 6; the receiver selection table 7 has an NDI value of 1. If the receiving end receives both enabled transport blocks in the DCI, the receiving end selects mapping relation one, i.e. table 6. And the receiving end refers to the selected mapping relation table according to the value of the joint coding domain obtained in the DCI command to obtain the joint coding content.

TABLE 6

TABLE 7

Another implementation of the mapping table 7 of the preferred embodiment is shown in table 8:

TABLE 8

In table 6, table 7, and table 8, the item not labeled nSCID indicates nSCID =0.

In the preferred embodiment, the receiving end is instructed to select between table 6 and table 7 by the NDI of the non-enabled transport block, supporting more orthogonal DMRS ports for MU-MIMO transmission while supporting SU-MIMO/MU-MIMO dynamic switching to the maximum extent.

For example, the receiving terminals 1 to 4 are sequentially assigned with the values 0 to 3 corresponding to one transport block in the table 6, and the receiving terminals 5 to 8 are sequentially assigned with the values 0 to 3 corresponding to one transport block in the table 7. DMRS ports to reach MU-MIMO have 2 pseudo-orthogonal groups, with 4 orthogonal DMRS ports in each group.

Or 4 values corresponding to one transmission block in the table 6 are allocated to the receiving end 1, 4-6 values corresponding to one transmission block in the table 7 are sequentially allocated to the receiving ends 2-4, at this time, 2 pseudo-orthogonal groups are also arranged on the DMRS port of the MU-MIMO by each receiving end 2 layer, and 4 orthogonal DMRS ports are arranged in each group.

There are of course other port allocation schemes.

For the number of layers of each receiving end participating in MU-MIMO transmission, in one embodiment of the present invention, it is defined that, in the case of MU-MIMO transmission, the number of layers transmitted by each receiving end is less than or equal to 2, and corresponds to one transmission block.

For the number of layers of each receiving end participating in MU-MIMO transmission, in another embodiment of the present invention, when performing MU-MIMO transmission, the number of transmission layers of each receiving end is not limited, that is, the number of transmission layers may be 1 to 8, and may correspond to 2 transmission blocks, and when the number of transmission layers is 2, the receiving end defaults to select table 6.

Preferred embodiment four

In the preferred embodiment, the sending end indicates the receiving end, and the scrambling code n of the DMRS port in the joint coding is _scid Whether the mapping of values to port groups is enabled.

When the data is not enabled, the DMRS port indicated in the DCI joint coding is the DMRS port used for data demodulation of the current subframe of the receiving end, n _scid There is no correspondence with the DMRS port group;

when enabled, the receiving end first jointly encodes n according to the DCI _scid Obtaining a port group, wherein if the port group is one, the DMRS port indicated in the DCI joint coding is the DMRS port used for data demodulation by the current subframe of the receiving end; and if the port group is two, replacing the DMRS port indicated in the DCI joint coding with a port in the port group two as the DMRS port for demodulating the current subframe data.

In the preferred embodiment, the first port group is DMRS port {7,8}, and the second port group is DMRS port {11,13}. n is _scid =0 corresponding port group one, n _scid =1 for port group two, port 7 for port 11, and port 8 for port 13.

In the preferred embodiment, the reference mapping relationship between the joint coding domain set and the joint coding content is shown in table 9:

TABLE 9

For the indication information of enabling or not, an implementation manner of the preferred embodiment is to notify through higher layer signaling, specifically 1-bit higher layer signaling n _scid -Point-DMRSPortType indicates the scrambling code n _scid The value indicates whether the port type is enabled.

Indicates that it is not enabled and takes place>

The representation is enabled when the set of jointly coded fields and the reference mapping of the jointly coded content are either as shown in table 9.

As for the indication information of enabling or not, another implementation manner of the present preferred embodiment is to indicate by NDI of the transport block, specifically, NDI =0 of the transport block not enabled indicates disabling, NDI =1 indicates enabling; when there are no transport blocks not enabled, or the scrambling code n is fixed _scid The value indicating port type enable, or fixed scrambling code n _scid The value indicates that the port type is not enabled, or whether the NDI indication of the first transport block is enabled, or whether the NDI indication of the second transport block is enabled. The reference mapping relationship between the set of jointly encoded fields and the jointly encoded content is shown either in table 9 or table 10.

For the indication information of enabling or not, the third implementation manner of the preferred embodiment is to indicate the scrambling code n by 1 LSB bit of RV bit field of the first enabled transport block _scid The value indicates whether the port type is enabled.

For the indication information of enabling or not, the fourth implementation of the preferred embodiment is indicated by 1 LSB bit of the MCS bit field of the first enabled transport blockThe scrambling code n _scid The value indicates whether the port type is enabled.

For the indication information of enabling or not, a fifth implementation manner of the preferred embodiment is to indicate the scrambling code n by 1 LSB bit of the process number bit field _scid The value indicates whether the port type is enabled.

TABLE 10

When n is _scid When the corresponding relationship with the port group is not enabled, the receiving end refers to the reference mapping relationship table (such as table 9 or table 10) according to the value of the joint coding domain to obtain a DMRS port, which is a DMRS port used for data demodulation reference signals in the current subframe of the receiving end, for example, the value of the joint coding domain of the receiving end corresponds to a value 1 of 1 transmission block, and the DMRS port used for data demodulation in the current subframe of the receiving end is a port 7; the value of the joint coding domain of the receiving end corresponds to the value 3 of 1 transmission block, and the DMRS port of the current subframe for data demodulation is port 8; the value of the joint coding domain of the receiving end corresponds to the value 1 of 2 transmission blocks, and the DMRS ports of the current subframe for data demodulation are ports 7-8.

When n is _scid When the corresponding relation with the port group is enabled, the receiving end firstly carries out the corresponding relation according to n in the joint coding domain _scid And obtaining a port group, and referring to the DMRS port obtained by referring to the mapping relationship table (e.g., table 9 or table 10), wherein if the port group is one, the DMRS port is the DMRS port used for data demodulation in the current subframe of the receiving end, and if the port group is two, the DMRS port indicated in the DCI joint coding needs to be replaced by a port in the port group two, which is the DMRS port used for data demodulation in the current subframe of the receiving end. Where 7 in port group one corresponds to 11 in port group two, and where 8 in port group one corresponds to 13 in port group two. For example, the value of the joint coding domain of the receiving end corresponds to the value 1 of 1 transmission block, and the DMRS port of the current subframe for data demodulation is port 11; the value of the joint coding domain of the receiving end corresponds to the value 3 of 1 transmission blockThe DMRS port of the current subframe for data demodulation is port 13; the value of the joint coding domain of the receiving end corresponds to the value 1 of 2 transmission blocks, and the DMRS ports of the current subframe for data demodulation are ports 11-13.

When n is _scid When the corresponding relationship with the port group is enabled, the existing initialization mode for generating the DMRS random sequence, that is, formula (1), needs to be modified to the mode shown in formula (2):

wherein n is _s Is the number of the sub-frame,

the DMRS random sequence is a Gold random sequence defined by a 31-bit 2-ary initialization value, and after QPSK modulation is carried out on the generated DMRS random sequence, the generated DMRS random sequence is multiplied by an OCC orthogonal code to be used as a final DMRS demodulation reference signal. In this case for both terminals 1 and 2, when terminal 1->

And terminal 2->

Are the same (or of terminal 1 +)>

And terminal 2->

Same), n in DCI may be utilized _scid And dynamically indicating the port group so as to achieve the orthogonality of the DMRS of the terminal 1 and the terminal 2.

Preferred embodiment five

In the preferred embodiment, the sending end notifies the receiving end to select among a plurality of mapping relationships. Different indication information corresponds to different mapping relations, and the indication information comprises at least one of the following information:

high-layer signaling;

new data indication NDI of the transport block;

a redundancy version of the transport block;

1 or more bits in a Hybrid Automatic Repeat request (HARQ) process number bit field.

1 or more bits in the transport block MCS bit field.

Preferably, when the number of bits indicating the mapping relation is less than the number of bits in the Bit field, the bits indicating the mapping relation occupy 1 or more LSB (Least Significant Bit) bits in the Bit field.

Specifically, in the preferred embodiment, the sending end notifies the receiving end to select from four mapping relationships, and the correspondence between the indication information and the mapping relationships is shown in table 11:

TABLE 11

Indicating information value	Mapping relation
		00	TABLE 12
01	Watch 13
		10	TABLE 14
11	Watch 15

One implementation of the 2-bit indication information of the preferred embodiment is via higher layer information notification.

A second implementation manner of the 2-bit indication information in the preferred embodiment is to indicate the NDI of the transport block, where 1 bit on the left side of the 2-bit indication bit is composed of the NDI of the first enabled transport block, and 1 bit on the right side of the 2-bit indication bit is composed of the NDI of another transport block except the first enabled transport block.

A third implementation manner of the 2-bit indication information in the preferred embodiment is to indicate the RV of the transport block, where 1 bit on the left side of the 2-bit indication bit is composed of 1 LSB bits of the RV bit field of the first enabling transport block, and 1 bit on the right side of the 2-bit indication bit is composed of 1 LSB bits of the RV bit field of another transport block except the first enabling transport block.

A fourth implementation manner of the 2-bit indication information of the preferred embodiment is to indicate by RV of a transport block, where the 2-bit indication is composed of 2 LSB bits of the RV bit field of the first enabled transport block.

The fifth implementation manner of the 2-bit indication information of the preferred embodiment is to indicate the MCS of the transport block, wherein the left 1 bit of the 2-bit indication bit is composed of 1 LSB bits of the MCS bit field of the first enabled transport block, and the right 1 bit of the 2-bit indication bit is composed of 1 LSB bits of the MCS bit field of another transport block except the first enabled transport block.

The sixth implementation of the 2-bit indication information of the preferred embodiment is the MCS indication by the transport block, wherein the 2-bit indication is composed of 2 LSB bits of the MCS bit field of the first enabled transport block.

The seventh implementation of the 2-bit indication information of the preferred embodiment is composed of 2 LSB bits of the process number indication field.

An eighth implementation manner of the 2-bit indication information in the preferred embodiment is to jointly indicate through the transmission block NDI and RV, where 1 bit on the left of the 2-bit indication bit is composed of 1 LSB bit of the RV bit field of the first enabling transmission block, and 1 bit on the right of the 2-bit indication bit is composed of the NDI of another transmission block except the first enabling transmission block.

TABLE 12

Watch 13

TABLE 14

Watch 15

In the entries not labeled in tables 12 to 15, nSCID =0, in tables 12 to 15, for the case of one codeword, transmission of 1 to 4 layers is reserved, and for the case of two codewords, port allocation of 2 to 8 layers is reserved, which is to solve the problem of collision of two contents required to be indicated by bits indicating mapping relationships, where one of the two contents indicates original indication contents (such as RV, MCS, NDI, process number) of the information bits, and the other indicates the indicated mapping relationships. For example, in the sixth embodiment, if the MCS value of the first enabled transport block is 19, the value of the 2 LSB bit field is 11, but SU-MIMO 8-layer transmission is performed at this time, if there is no 8-layer SU-MIMO scheduling in the table 15, the 2 LSB indication bit field of the MCS bit field needs to be modified to another value at this time, or other layer allocation in the table 15 is adopted at this time, so that the system performance is reduced, and a limitation is imposed on the base station scheduling.

Preferred embodiment six

In this preferred embodiment, the sender instructs the receiver to select among different mapping relationships through the NDI of the transport block in the DCI command. When the transmission block is not enabled, the NDI of the transmission block is indicated to select different mapping relations; when there are no disabled transport blocks, that is, the receiving end transmits two transport blocks, the transmitting end instructs the receiving end to select a mapping relationship by one of the following methods:

selecting different mapping relations according to the NDI of the first enabling transmission block;

and selecting different mapping relations according to the NDI of the second enabled transmission block.

In the preferred embodiment, if the receiving end receives only one enabled transport block in the DCI and one disabled transport block, the receiving end selects the mapping relationship table according to the NDI value of the disabled transport block; if the receiving end receives the two transmission blocks in the DCI, the receiving end selects different mapping relations according to the NDI of the first enabling block or selects different mapping relations according to the NDI of the second enabling block, wherein the NDI value is 0, and the receiving end selects the table 16; the receiver selection table 17 has an NDI value of 1. And then the receiving end refers to the selected mapping relation table according to the joint coding domain value obtained in the DCI command to obtain the joint coding content.

TABLE 16

TABLE 17

N in the items not labeled in tables 16 and 17 _SCID ＝0。

Preferred embodiment seven

In this preferred embodiment, the sending end and the receiving end agree on N port groups, and the sending end indicates, through at least one of the following indication information, the port group that should be selected by the receiving end in the current subframe:

RRC signaling;

a physical layer NDI;

and the receiving end further determines the DMRS port of the current subframe for data demodulation according to the DMRS port group information and by combining with the DMRS port configuration information of the physical layer signaling.

Specifically, in the preferred embodiment, N =2, port group one is DMRS port {7,8}, and port group two is DMRS port {11,13}, and the joint coding table of ports, number of layers, and scrambling codes in the DCI command is shown in table 18.

Watch 18

For the indication of the port group, in an implementation manner of this preferred embodiment, the receiving end obtains the port group indication information according to the RRC high layer signaling, where a corresponding relationship between the high layer signaling value and the port group is shown in table 19:

watch 19

High layer signaling value	Port group
		0	{7,8}
1	{11,13}

For the indication of the port group, in another implementation manner of the preferred embodiment, the receiving end obtains the indication information of the port group according to the NDI, specifically:

when the code word is not enabled, the NDI of the code word is indicated to be different port groups;

when there are no non-enabled codewords, the NDI of the first enabled codeword indicates a different port group;

the mapping relationship between NDI and port group is shown in table 20:

watch 20

NDI	Port group
		0	{7,8}
1	{11,13}

When the receiving end obtains the DMRS port set of the current subframe as {7,8}, the DMRS port indicated in table 19 is the DMRS port used for data demodulation by the receiving end in the current subframe.

When the receiving end obtains the DMRS port group of the current subframe as {11,13}, the following two cases are handled:

the first condition is as follows: corresponding to the entry with the number of layers indicated in table 18 being less than or equal to 2, at this time, the DMRS port indicated in table 18 needs to be replaced, that is, the port indicated in table 18 in port group one corresponds to the port in port group two, the port in port group two serves as the DMRS port used for data demodulation by the current subframe of the receiving end, specifically, port 7 corresponds to port 11, and port 8 corresponds to port 13;

case two: corresponding to the entry with the number of layers greater than 2 indicated in the table 20, at this time, the DMRS port indicated in the table 18 is the DMRS port for demodulating the current subframe data of the receiving end.

Preferred embodiment eight

RRC signaling;

a physical layer NDI;

and the receiving end further determines the DMRS port used for data demodulation in the current subframe according to the DMRS port group information and the index configuration information of the DMRS port in the group of the physical layer signaling.

In the preferred embodiment, N =2, port group one is DMRS port {7,8,9,10,11,12,13,14}, port group two is DMRS port {11,13,9,10,7,12,8,14}, and the joint coding table of intra-group port index, number of layers, and scrambling code in the DCI command is shown in table 21.

TABLE 21

For the indication of the port group, in an implementation manner of this preferred embodiment, the receiving end obtains the port group indication information according to the RRC high layer signaling, where a corresponding relationship between the high layer signaling value and the port group is shown in table 22:

TABLE 22

High layer signaling value	Port group
		0	{7,8,9,10,11,12,13,14}
1	{11,13,9,10,7,12,8,14}

the mapping relationship between NDI and port group is shown in table 23:

TABLE 23

NDI	Port group
		0	{7,8,9,10,11,12,13,14}
1	{11,13,9,10,7,12,8,14}

The receiving end combines the port group and the port group index information notification in the DCI command to obtain the DMRS port information used for demodulation by the current subframe, for example, the receiving end obtains a port group of a, a port index of a DCI command of k, a DMRS port used for demodulation by the current subframe of the receiving end of a {11,13,9,10,7,12,8,14} and obtains a scrambling code, an intra-group port index, a number of layer number combined coding field value of 3 corresponding to two codewords, that is, 4 layers, and a port index of 1-4 in the DCI command, then the DMRS port used for demodulation by the current subframe of the receiving end of a {11,13,9,10}.

Preferred embodiment nine

In the preferred embodiment, the base station notifies DMRS port allocation information and M-1 other information in a manner of jointly encoding M information, wherein the M-1 other information at least includes DMRS pilot scrambling code configuration information n _scid When the number of layers is r (r =1,2), the base station and the receiving end agree on N pieces of N number of layers _scid Corresponding to N different DMRS port groups, N N _scid And binding the values and the N DMRS port groups during joint coding.

Specifically, in the preferred embodiment, M =3,n =1, which refers to the DMRS port of the receiving end, the number of PDSCH layers of the receiving end, and the scrambling code n of the DMRS port of the receiving end _scid Joint coding of the three, n _scid Binding with a port group, for example, the joint encoding result is shown in table 24:

watch 24

At this time, the existing DMRS random sequence generation initialization method, that is, formula (1), needs to be modified to the formula (2):

wherein n is _s Is the number of the sub-frame,

And terminal 2->

Is the same (or of terminal 1->

And terminal 2->

Same), n in DCI may be utilized _scid And dynamically indicating the port group so as to achieve the orthogonality of the DMRSs of the terminal 1 and the terminal 2.

Preferred embodiment ten

In the preferred embodiment, the base station notifies DMRS port allocation information and M-1 other information in a manner of jointly encoding M information, wherein the M-1 other information at least includes DMRS pilot scrambling code configuration information, n, and _scid information and layer number indication information of the receiving end, when the layer number is r (r =1,2), the base station and the receiving end agree N N _scid Corresponding to N different DMRS port groups, N N _scid And binding the values and the N DMRS port groups during joint coding.

Notification by higher layer signaling

The high layer configures different candidate values for different numbers of codewords. As shown in the following table:

TABLE 25

In particular, high layer configuration

But the high-level configuration process does not know the specific number of the code words in actual transmission, and the virtual cell and the candidate value are determined by searching the corresponding table according to the actual number of the code words in the transmission process.

Description of the preferred embodiment

In the preferred embodiment, the base station notifies DMRS port allocation information and M-1 other information in a manner of jointly encoding M information, wherein the M-1 other information at least includes DMRS pilot scrambling code configuration information n _scid Information and layer number indication information of the receiving end, when the layer number is r (r =1,2), the base station and the receiving end agree N N _scid Corresponding to N different DMRS port groups, N N _scid And binding the values and the N DMRS port groups during joint coding.

Specifically, in the preferred embodiment, M =3,n =1, which refers to the DMRS port of the receiving end, the number of PDSCH layers of the receiving end, and the scrambling code n of the DMRS port of the receiving end _scid Joint coding of the three, n _scid Binding with a port group, such as its joint encoding result is shown in table 26:

watch 26

when the number of codewords is one, the mapping relationship between the NDI and the port group is shown in table 27:

watch 27

When the number of codewords is one, the mapping relationship between nSCID and port group is shown in table 28:

watch 28

/>

wherein n is _s Is the number of the sub-frame,

f(n _scid )∈{0,1}，n _scid e {0,1}, wherein

Is the virtual cell ID that the terminal uses for DMRS demodulation.

Further, the number of currently transmitted code words and/or the configuration of high-level signaling may be referred to, and when the number of code words is two, c _init F (n) of _SCID ) Is modified into

f(n _SCID )＝xor(f(n _SCID ),1)

C, referring to the number of the currently transmitted code words and the configuration of the high-level signaling, when the number of the code words is enabled by the configuration of the two-level and high-level signaling _init G (n) of _SCID ) The correction is as follows:

g(n _SCID )＝0

wherein n is _s Is the number of the sub-frame,

the DMRS random sequence is a Gold random sequence defined by a 31-bit 2-ary initialization value, and after QPSK modulation is carried out on the generated DMRS random sequence, the generated DMRS random sequence is multiplied by an OCC orthogonal code to be used as a final DMRS demodulation reference signal. Now for both terminal 1 and terminal 2, when terminal 1 is @>

And terminal 2>

Are the same (or of terminal 1 +)>

And terminal 2>

Same), the number of code words is two, n in DCI can be utilized _scid And dynamically indicating the port group so as to achieve the orthogonality of the DMRSs of the terminal 1 and the terminal 2.

In this embodiment, the transmission process is double-codeword transmission, and the mapping relationship between the virtual cell and the candidate value is determined by searching the mapping relationship between double codewords according to the configuration of the high layer.

The above preferred embodiment increases the orthogonal DMRS ports for MU-MIMO transmission without increasing the number of layers, ports, and the number of bits occupied by the scrambling code joint coding field, thereby increasing the number of orthogonal DMRS ports for MU-MIMO without increasing the TM mode.

Even if TM mode needs to be increased due to increase in other aspects, the number of layers, ports, and the number of bits occupied by the scrambling code joint coding domain in the method of the preferred embodiment of the present invention may be kept unchanged, thereby saving DCI overhead, or the number of bits occupied by the joint coding domain is increased, and with the above preferred embodiment, the number of orthogonal DMRS ports used for MU-MIMO transmission may be greatly increased.

By using the method of the preferred embodiment of the invention, under the condition of not increasing DCI2C and DCI2D bit numbers, more DMRS ports of an MU-MIMO receiving end are orthogonalized, and further, under the condition of not increasing transmission modes, high-order MU-MIMO transmission is supported, the system performance is improved, and the terminal complexity is reduced.

Particularly, when the NDI indicates a port group or a mapping relation, the orthogonalization indication at the moment is dynamic, and the dynamic switching of MU-MIMO/SU-MIMO can be supported to the maximum extent.

Meanwhile, the method of the preferred embodiment of the present invention can also be used for a DCI mode newly added in the future, and at this time, the method of the preferred embodiment of the present invention can also support high-order MU-MIMO transmission while reducing the bit number of the newly added DCI mode.

Meanwhile, when multiplexing the existing information bits in the DCI, the preferred embodiment of the present invention fully considers the solution of the conflict between two contents indicated by the information bits, where one of the two contents represents the original indicated content (such as RV, MCS, NDI, process number) of the existing information bits, and the other represents the mapping relationship indicated by the existing information bits.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

It should be noted that the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.

The embodiment of the invention also provides a storage medium. Optionally, in this embodiment, the storage medium may be configured to store program codes for executing the method steps of the above embodiment:

optionally, in this embodiment, the storage medium may include but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

Optionally, in this embodiment, the processor executes the method steps of the above embodiments according to the program code stored in the storage medium.

Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method of wireless communication, the method comprising:

a base station transmits indication information to a terminal device, wherein the indication information is used for indicating one selected mapping relation from a plurality of mapping relations, the selected mapping relation specifies a relation between a numerical value of a joint coding domain and joint coding information, the joint coding information comprises one or more demodulation reference signal (DMRS) ports of a Physical Downlink Shared Channel (PDSCH) and grouping information related to the DMRS, and the joint coding information comprises power difference information between the PDSCH and the DMRS ports of the PDSCH;

the base station transmits on the PDSCH based on the selected one mapping relationship.

2. The method of claim 1,

the bit numbers of the joint coding domains corresponding to different mapping relations are the same.

3. The method of claim 1,

the same value of the joint coding field corresponds to first joint coding information when one transmission block is available, and corresponds to second joint coding information when two transmission blocks are available, wherein the second joint coding information is different from the first joint coding information.

4. The method of claim 1,

the plurality of mapping relationships are predefined.

5. The method of claim 1,

the indication information is included in higher layer signaling.

6. A method of wireless communication, the method comprising:

the method comprises the steps that a terminal device receives indication information sent by a base station, wherein the indication information is used for indicating one selected mapping relation from a plurality of mapping relations, the selected mapping relation specifies the relation between the numerical value of a joint coding domain and joint coding information, the joint coding information comprises one or more demodulation reference signals (DMRS) ports of a Physical Downlink Shared Channel (PDSCH) and grouping information related to the DMRS, and the joint coding information comprises power difference information between the PDSCH and the DMRS ports of the PDSCH;

the terminal device receives a transmission on the PDSCH from the base station based on the selected one mapping.

7. The method of claim 6,

8. The method of claim 6,

the same value of the joint coding field corresponds to first joint coding information when one transmission block corresponds, and corresponds to second joint coding information when two transmission blocks correspond, and the second joint coding information is different from the first joint coding information.

9. The method of claim 6,

the plurality of mapping relationships are predefined.

10. The method of claim 6,

the indication information is included in higher layer signaling.

11. A wireless communication apparatus, comprising a processor configured to:

transmitting indication information to a terminal device, the indication information indicating a selected one of a plurality of mapping relationships, wherein the selected one of the mapping relationships specifies a relationship between a numerical value of a joint coding field and joint coding information, the joint coding information includes one or more demodulation reference signal (DMRS) ports of a Physical Downlink Shared Channel (PDSCH) and grouping information related to DMRS, and the joint coding information includes power difference information between the PDSCH and the DMRS ports of the PDSCH;

transmitting on the PDSCH based on the selected one mapping relationship.

12. The apparatus of claim 11,

13. The apparatus of claim 11,

14. The apparatus of claim 11,

the plurality of mapping relationships are predefined.

15. The apparatus of claim 11,

the indication information is included in higher layer signaling.

16. A wireless communication apparatus, comprising a processor configured to:

receiving indication information transmitted by a base station, wherein the indication information is used for indicating one selected mapping relation from a plurality of mapping relations, the selected mapping relation specifies a relation between a numerical value of a joint coding domain and joint coding information, the joint coding information comprises one or more demodulation reference signal (DMRS) ports of a Physical Downlink Shared Channel (PDSCH) and grouping information related to DMRS, and the joint coding information comprises power difference information between the PDSCH and the DMRS ports of the PDSCH;

receiving a transmission on the PDSCH from the base station based on the selected one mapping.

17. The apparatus of claim 16,

18. The apparatus of claim 16,

19. The apparatus of claim 16,

the plurality of mapping relationships are predefined.

20. The apparatus of claim 16,

the indication information is included in higher layer signaling.