WO2019227432A1

WO2019227432A1 - Downlink control information transmission method and device

Info

Publication number: WO2019227432A1
Application number: PCT/CN2018/089365
Authority: WO
Inventors: 张瑞齐
Original assignee: 华为技术有限公司
Priority date: 2018-05-31
Filing date: 2018-05-31
Publication date: 2019-12-05
Also published as: CN112136351A

Abstract

The present application provides a downlink control information transmission method and a device, pertaining to the technical field of communications and improving the accuracy of channel estimation. The method comprises: allocating P resource element groups (REG), the P REGs comprising M REG sets, and each of the M REG sets comprising K REGs occupying consecutive resource elements in a frequency domain, where M ≥ 1, K ≥ 2, P ≥ MK, and M and K are integers; and sending DCI and a dedicated pilot signal on the P REGs, the dedicated pilot signal being carried on at least one RE of each REG of the P REGs.

Description

Method and device for transmitting downlink control information

Technical field

The present application relates to the field of communication technologies, and in particular, to a method and device for transmitting downlink control information (DCI).

Background technique

In a long term evolution (LTE) system, before a base station sends data to a terminal device on a physical downlink shared channel (PDSCH), the base station usually uses a physical downlink control channel (PDCCH). The DCI is sent to the terminal device to indicate the time-frequency resource occupied by the PDSCH allocated to the terminal device in the PDSCH area, the modulation and coding mode of the data, and the like. When the base station allocates the PDCCH, it usually uses resource group (resource element group, REG) as the minimum resource unit for allocation. A REG includes an orthogonal frequency division multiplexing (OFDM) symbol. In addition to REs carrying cell-specific reference signals (CRS), there are 4 consecutive resource elements. , RE), 9 REGs constitute a control channel element (control channel element, CCE).

Because terminal equipment usually does not know the specific time-frequency position of the PDCCH and the number of CCEs allocated by the base station when receiving the DCI, the terminal device generally uses the protocol to blindly detect the PDCCH time-frequency position and the number of CCEs. Tune the DCI carried on the PDCCH. In order to detect the PDCCH, the CRS needs to be used for channel estimation. The CRS and the PDCCH have a wide coverage area, that is, the entire cell is covered. Since the DCI carries parameters for demodulating and decoding downlink data, there is a high requirement for accuracy, for example, the bit error rate cannot exceed 0.1%. When a terminal device is located at the edge of a cell, it will be subject to strong neighboring cell interference. In order to ensure the accuracy of detection, the base station needs to allocate more CCEs (such as 4 CCEs or 8 CCEs) to carry the DCI of the terminal device. In order to reduce the encoding rate of DCI and improve the decoding performance. However, because the resources of the PDCCH region are limited, this approach will reduce the number of users that the PDCCH region can support.

Currently, a DCI of a terminal device is transmitted by using a beamforming weight specific to the terminal device. In this manner, a resource element (resource element, RE) of each REG allocated by the base station carries a demodulation reference signal (DMRS) dedicated to a terminal device. Enables the terminal to perform channel estimation based on DMRS, thereby demodulating DCI. Because the DMRS and DCI are weighted and transmitted by a specific beamforming weight of the terminal device, the energy of the DCI and DMRS is more concentrated at the receiving end, thereby improving the received DCI and DMRS signal quality.

However, the REGs allocated by the base station are currently distributed in the frequency domain in a discrete state. Therefore, the terminal can only perform channel estimation and signal demodulation on individual REGs with one DMRS carried on each REG, so the accuracy of channel estimation is low. .

Summary of the Invention

The present application provides a DCI transmission method and device, which can improve the accuracy of channel estimation.

In a first aspect, the present application provides a DCI transmission method, which includes: allocating P resource groups REGs to a terminal device, the P REGs including M REG groups, and each REG group in the M REG groups includes K REGs, the resources occupied by the K REGs in the frequency domain are continuous, M≥1, K≥2, P≥MK, M and K are integers; DCI and dedicated pilot signals are sent on the P REGs , The dedicated pilot signal is carried on at least one resource unit RE of each REG in the P REGs.

With the method provided in this application, a network device includes at least M REG groups among the P REGs allocated to the terminal device, and the K REGs included in each REG group occupy the resources in the frequency domain continuously. The terminal device can perform channel estimation on the corresponding REG group according to the dedicated pilot signal carried on each REG group, thereby improving the accuracy of the channel estimation, thereby improving the accuracy of demodulation of the DCI carried on each REG group.

In a second aspect, the present application provides a DCI transmission method. The method includes: receiving dedicated pilot signals and DCIs sent by network equipment on P resource groups REGs, and the dedicated pilot signals are carried in each of the P REGs. On at least one resource unit RE of the REG, the P REGs include M REG groups, each REG group in the M REG groups includes K REGs, and the resources occupied by the K REGs in the frequency domain are continuous, M ≥1, K≥2, P≥MK, M and K are integers; the dedicated pilot signals carried on each REG group are used to perform channel estimation on the corresponding REG group, and the channel estimation results of M REG groups are obtained; The DCIs carried on the M REG groups are processed according to the channel estimation results of the M REG groups.

With the method provided in this application, since the P REGs allocated by the network device to the terminal device include at least M REG groups, and the K REGs included in each REG group occupy continuous resources in the frequency domain, the terminal The device can perform channel estimation on the corresponding REG group according to the dedicated pilot signal carried on each REG group, and improve the accuracy of the channel estimation, thereby improving the accuracy of demodulation of the DCI carried on each REG group.

In a third aspect, a network device includes: an allocation unit for allocating P resource groups REG to a terminal device, the P REGs include M REG groups, and each REG group in the M REG groups includes K REG, the resources occupied by the K REGs in the frequency domain are continuous, M≥1, K≥2, P≥MK, M and K are integers; the sending unit is used to send on the P REGs allocated by the allocation unit The downlink control information DCI and a dedicated pilot signal are carried on at least one RE of each REG of the P REGs.

In a fourth aspect, the present application provides a terminal device, including: a receiving unit, configured to receive dedicated pilot signals and downlink control signals DCI sent by network equipment on P resource groups REGs, and the dedicated pilot signals are carried on the P On at least one RE of each REG in the REG, the P REGs include M REG groups, each REG group in the M REG groups includes K REGs, and the resources occupied by the K REGs in the frequency domain Continuous, M≥1, K≥2, P≥MK, M and K are integers; the processing unit is used to use the dedicated pilot signal carried on each REG group to perform channel estimation on the corresponding REG group to obtain M Channel estimation results of the REG groups; the processing unit is further configured to process the DCIs carried on the M REG groups according to the channel estimation results of the M REG groups.

For the first to fourth aspects, optionally, the value of K is indicated by the radio resource control RRC signaling or the media access control unit MAC-CER.

Optionally, the resources occupied by the K REGs in the frequency domain are continuous and include: in addition to REs carrying a physical control channel format indication channel PCFICH, a physical hybrid adaptive retransmission indication channel PHICH, and a cell-specific reference signal CRS, K There are no REs carrying other channels between the REGs.

Optionally, the sequence number of each REG in the mth REG group of the M REG groups is {i _m , i _m + N, ..., i _m + (K-1) N}, and i _m represents the mth Sequence number of the first REG in each REG group, N represents the number of interleaver columns that interleave the P REGs, i _m ≧ 0, 1 ≦ _m ≦ M, and m and i are positive integers.

Optionally, the sequence number i _m of the first REG in the m-th REG group satisfies: i _m = i ₁ + m-1, where i ₁ represents the sequence number of the first REG in the first REG group.

Optionally, when P> MK, the P REGs also include the M + 1th REG group, the M + 1th REG group includes the P-MK REGs, and the sequence number of each REG in the M + 1th REG group In order: {i _{M + 1} , i _{M + 1} + N, ..., i _{M + 1} + (P-MK-1) N}, P-MK <K.

Optionally, the M REG groups include B control channel elements CCE, and each CCE in the B CCEs includes L such REG groups, where M≥BL, L≥1, B≥1, and B and L are integers. .

Optionally, the M REG groups include B control channel elements CCE, and the K REGs in each REG group belong to the K CCEs in the B CCEs, respectively.

Based on the second aspect or the fourth aspect, optionally, before receiving dedicated pilot signals and DCIs sent by network equipment on P REGs, the method further includes: for K REGs in each REG group, assuming network equipment The same beamforming weights are used to send dedicated pilot signals and DCI on the K REGs.

Optionally, for the M REG groups, it is assumed that the network device sends a dedicated pilot signal and DCI with different beamforming weights on the M REG groups.

In a fifth aspect, a network device is provided, and the communication device has a function of implementing the network device in the method design of the first aspect. These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software. The hardware or software includes one or more units corresponding to the functions described above.

According to a sixth aspect, a terminal device is provided, and the communication device has a function of implementing the terminal device in the method design of the second aspect. These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software. The hardware or software includes one or more units corresponding to the functions described above.

According to a seventh aspect, a communication device is provided, including a processor and a memory. The memory is used to store a program or instruction, and the processor is used to call and run the program or instruction from the memory, so that the communication device executes the method in the first aspect.

Optionally, the communication device may further include a transceiver, which is used to support the communication device to perform data transmission, signaling, or information transmission in the method of the first aspect, for example, sending a DCI and a dedicated pilot signal.

Optionally, the communication device may be a network device or a part of the network device, such as a chip system in the network device. Optionally, the chip system is configured to support a network device to implement the functions involved in the foregoing aspects, for example, allocating, sending, or processing data and / or information involved in the foregoing methods. In a possible design, the chip system further includes a memory, and the memory is configured to store program instructions and data necessary for the network device. The chip system, including the chip, may also include other discrete devices or circuit structures.

According to an eighth aspect, a communication device is provided, including a processor and a memory. The memory is used to store a program or instruction, and the processor is used to call and run the program or instruction from the memory, so that the communication device executes the method in the second aspect.

Optionally, the communication device may further include a transceiver for supporting the communication device to perform data receiving, data receiving, signaling, or information receiving in the method of the second aspect, for example, receiving a DCI and a dedicated pilot signal.

Optionally, the communication device may be a terminal device or a part of the terminal device, such as a chip system in the terminal device. Optionally, the chip system is configured to support a terminal device to implement the functions involved in the foregoing aspects, for example, to receive or process data and / or information involved in the foregoing methods. In a possible design, the chip system further includes a memory, and the memory is configured to store program instructions and data necessary for the terminal device. The chip system, including the chip, may also include other discrete devices or circuit structures.

In a ninth aspect, the present application provides a computer storage medium. The computer storage medium stores instructions. When the instructions are run on the computer, the computer is implemented as in the first aspect, the optional manner of the first aspect, the second aspect, or the first aspect. The DCI transmission method described in the optional aspect of the second aspect.

In a tenth aspect, the present application provides a computer program product containing instructions, which when run on a computer, causes the computer to implement the first aspect, the optional manner of the first aspect, the second aspect, or the optional aspect of the second aspect. The DCI transmission method described in the above method.

In an eleventh aspect, the present application provides a communication system including the network device according to the third aspect or any optional aspect of the third aspect, and the fourth aspect or any optional aspect of the fourth aspect. Or a terminal device according to the fifth aspect, and a terminal device according to the sixth aspect; or a communication device according to the seventh aspect or any optional aspect of the seventh aspect And the communication device according to the eighth aspect or any optional aspect of the eighth aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a communication system provided by the present application;

2 is a schematic diagram of an allocation method of REGs in the prior art;

3 is a schematic diagram of the distribution of REGs in the prior art;

4 is a schematic flowchart of an embodiment of a DCI transmission method provided by this application;

FIG. 5A is a first schematic diagram of interleaving of a REG provided by this application; FIG.

5B is a second schematic diagram of interleaving of a REG provided in this application;

FIG. 6A is a first schematic diagram of interleaving of CCEs provided by the present application; FIG.

FIG. 6B is a second schematic diagram of interleaving of CCEs provided by the present application; FIG.

7 is a schematic diagram of a bearer situation of a DCI and a DMRS provided in this application in a REG;

FIG. 8 is a schematic structural diagram of a network device provided by this application;

FIG. 9 is a schematic structural diagram of a terminal device provided by this application;

FIG. 10 is a schematic structural diagram of a communication device provided by the present application.

Detailed ways

First of all, the term "and / or" in this article is just a kind of association relationship describing related objects. It means that there can be three kinds of relationships. For example, A and B can mean: A exists separately, A and B exist simultaneously, and they exist separately. B these three cases.

Second, the DCI transmission method provided in this application can be applied to any system that needs to transmit DCI, including long term evolution (LTE) systems, advanced long term evolution (LTE-Avanced, LTE-A), or other methods A wireless communication system of a wireless access technology, such as a system using access technologies such as code division multiple access, frequency division multiple access, time division multiple access, orthogonal frequency division multiple access, and carrier aggregation (CA). In addition, it can also be applied to the use of subsequent evolved systems, such as the fifth generation 5G system.

Exemplarily, as shown in FIG. 1, the DCI transmission method provided in this application may be applied to a communication system including at least one network device and at least one terminal device. The network device may be a device deployed in a wireless access network to provide wireless communication functions for terminal devices, such as a base station (BS) or a base transceiver station (BTS). In systems using different wireless access technologies, the names of equipment with base station functions may be different. For example, in the LTE network, it is called evolved NodeB (eNB or eNodeB). In the communication (3G) network, it is called Node B, or it is used in the fifth generation communication system and has equipment with base station functions. For convenience of description, in the present application, the above-mentioned devices having a base station function are collectively referred to as network devices.

The terminal devices involved in this application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, smart phones, smart watches, tablet computers, and various forms of user equipment (user equipment) , UE) and so on. For the convenience of description, the devices mentioned above are collectively referred to as terminal devices in this application.

When a network device assigns a REG to a terminal device, it usually assigns them in order according to the sequence number of the REG. For example, if the sequence number of the first REG assigned by the network device to the terminal device is j, and the total number of assigned REGs is p, then the sequence numbers of the p REGs are j, j + 1, j + 2, ... , J + p-1. Assume that the total number of REGs in the PDCCH region in one subframe is J. As shown in FIG. 2, the p REGs are arranged according to the sequence number.

The network device inputs the p REGs into the interleaver, and the number of columns of the interleaver is N and the number of rows is

,among them

Represents a round-up operation. The interleaver maps the p REGs in rows as

In a matrix with rows and N columns, the matrix is then exchanged with rows and columns according to a preset rule, and then an interleaver is output in the order of the columns of the matrix to complete the mapping to the frequency domain. Then in the frequency domain, the p REGs are distributed in the PDCCH region in a discrete state. The p REGs are divided into one CCE every 9 numbers in sequence. Therefore, each REG in each CCE is also discrete in the frequency domain.

Exemplarily, as shown in FIG. 3, in one subframe, 3 REGs allocated by the network device to the terminal device (as shown in FIG. 3, the 4 REs circled by the coil constitute one REG) in the frequency domain and the time domain All are discrete state distributions. This results in that when a terminal device performs channel estimation, it can only use the DMRS carried on each REG to perform channel estimation on an individual REG, so the accuracy of the channel estimation is low, which affects the demodulation of the DCI carried on the REG. .

To this end, this application provides a DCI transmission method. The P REGs allocated by the network device to the terminal device include at least M REG groups, and the K REGs included in each REG group occupy the frequency domain. The resources are continuous, so that the terminal device can perform channel estimation on the corresponding REG group according to the dedicated pilot signal carried on each REG group, and improve the accuracy of the channel estimation, thereby improving the demodulation of the DCI carried on each REG group. Correct rate.

As shown in FIG. 4, it is a schematic flowchart of an embodiment of a DCI transmission method provided by the present application. The method includes:

Step 401: The network device allocates P REGs to the terminal device. The P REGs include M REG groups. Each REG group in the M REG groups includes K REGs. The K REGs occupy the frequency domain. Resources are continuous, M≥1, K≥2, P≥MK, M and K are integers.

In this application, one REG includes one orthogonal frequency division multiplexing (OFDM) symbol. In addition to REs carrying cell-specific reference signals (CRS), n consecutive Resource element (RE), n> 1, n integer.

When a network device allocates a PDCCH to a terminal device, it can use a grouping method to allocate a REG to the terminal device. That is, the P REGs constituting the PDCCH allocated by the network device to the terminal device include at least M REG groups, and each REG group includes K consecutive REGs occupying resources in the frequency domain.

Among them, the resources occupied by the K REGs contained in each REG group in the frequency domain are continuous, meaning that in addition to carrying the physical control channel format indication channel (PCFICH), the physical hybrid adaptive retransmission indication channel ( Physical HARQ (indication channel, PHICH) and CRS REs, there are no REs carrying other channels between the K REGs. That is, the K REGs in each REG group may be adjacent in sequence, or may be adjacent in sequence through REs carrying PCFICH, PHICH, and / or CRS.

Exemplarily, the network device may allocate P REGs according to a preset sequence number rule. For example, the sequence number of each REG in the mth REG group of the M REG groups is {i _m , i _m + N, ..., i _m + (K-1) N}, and i _m represents the mth REG Sequence number of the first REG in the group, N represents the number of interleaver columns that interleave the P REGs, i _m ≥0, 1≤m≤M, and m and i are positive integers.

Exemplary, assuming _{m = 2, i m = 3} , N = 32, K = 3, a total number of the sub-frame PDCCH region is J-REG. After the network device inputs the three REGs (the sequence numbers are 3, 35, 67) in the second REG group to the interleaver, the interleaver maps the three REGs to the interleaver row by row.

Row, 32 column matrix. As shown in FIG. 5A, the three REGs are

Rows, 32 columns of matrices are adjacent on one column. Therefore, according to the column output, when mapped to the frequency domain, the three REGs are continuous.

Optionally, the sequence number i _m of the first REG in the m-th REG group satisfies: i _m = i ₁ + m-1, where i ₁ represents the sequence number of the first REG in the first REG group. That is, the sequence numbers of the first REGs in the M REG groups are consecutive.

Exemplarily, based on the example shown in FIG. 5A, as shown in FIG. 5B, i ₁ = 2, and the serial numbers of the three REGs of the first REG group are 2,34,66 in sequence. Maps to

After the matrix of rows and 32 columns, the three REGs of the first REG group are also adjacent on one column. Therefore, according to the column output, when mapping to the frequency domain, the three REGs of the first REG group are also continuous.

It can be understood that the sequence number of the first REG in each REG group may also be irregular, for example, i ₁ = 1, i ₂ = 5, i ₃ = 6, etc. It is only necessary to ensure that the sequence numbers of the K REGs in each REG group of the M REG groups are sequentially different by N.

In one example, when P> MK, the P REGs also include the M + 1th REG group, the M + 1th REG group includes the P-MK REGs, and each REG in the M + 1th REG group The serial numbers are {i _{M + 1} , i _{M + 1} + N, ..., i _{M + 1} + (P-MK-1) N}, and P-MK <K.

In this application, the P REGs can be divided into at least B (B ≧ 1, B is an integer) CCEs.

In one example, the M REG groups may include at least B CCEs, and each CCE is composed of L (L ≧ 1, L is an integer) REG groups, instead of being composed of multiple REGs with consecutive numbers, M ≧ BL. Assuming that one CCE includes 9 REGs as an example, when K = 3, L = 3, that is, one CCE includes 3 REG groups. Exemplarily, the network device allocates 21 REGs to the terminal device, a total of 7 REG groups, and each REG group includes 3 REGs with continuous resources occupied in the frequency domain. The distribution of the 30 REGs after being mapped by the interleaver can be shown in FIG. 6A. The first to third REG groups constitute a CCE (assuming CCE1), and the fourth to sixth groups constitute a CCE (assuming CCE2). In this example, the resources occupied by each K REG in the frequency domain in each CCE are continuous.

Optionally, the K REGs in each REG group may belong to the K CCEs, respectively. Exemplarily, a CCE includes 9 REGs as an example, it is assumed that P = 18, M = 9, and K = 2. The distribution of the 18 REGs after being mapped by the interleaver can be shown in FIG. 6B. Among them, two of the nine REGs belong to CCE3 and CCE4, respectively. In this example, although the resources occupied by the REG in each CCE in the frequency domain are discontinuous, each REG in each CCE is in the frequency domain with a REG in another CCE Is continuous.

In this application, the value of K may be a preset fixed value, or may be indicated by high-level signaling. For example, it is indicated by radio resource control (radio resource control (RRC)) signaling or a multimedia access control unit (media access control-control element (MAC-CE)).

Step 402: The network device sends DCI and a dedicated pilot signal on the P REGs, and the dedicated pilot signal is carried on at least one RE of each REG in the P REGs.

It can be understood that each REG uses a designated RE to carry the dedicated pilot signal of the terminal device, and the remaining remaining REs are used to carry the DCI of the terminal device.

For example, as shown in FIG. 7, it is assumed that the dedicated pilot signal of the terminal device is the DMRS of the terminal device. One REG contains four consecutive REs, one of which carries the DMRS, and the remaining three REs respectively carry Part of the terminal device is DCI.

When the network device sends the DCI and the dedicated pilot signal on the P REGs, it may use the specific beamforming weights of the terminal device to send. Wherein, the beamforming weight value is a multiplication factor used by the network device when transmitting dedicated pilot signals and DCI on A (A ≧ 1, A is an integer) antenna ports. Network equipment sends DCI and dedicated pilot signals through specific beamforming weights of the terminal equipment, so that the energy of DCI and DMRS can be concentrated at the location of the terminal equipment, and the signal quality of the DCI and DMRS signals received by the terminal equipment can be improved.

Exemplarily, for K REGs in each REG group, the network device may use the same beamforming weights on the K REGs to send dedicated pilot signals and DCI. For M REG groups or M + 1 REG groups, the network device may use the same or different beamforming weights on M REG groups or M + 1 REG groups.

It should be noted that the specific value of the beamforming weights used by the network equipment may be different for different terminal equipment. The beamforming weights used for a certain terminal equipment are generally specific to the terminal equipment. The terminal device has a better performance weight.

Correspondingly, before receiving the DCI and the dedicated pilot signals on the P REGs, the terminal device needs to assume the network device adopts beamforming weighting according to the transmission rule corresponding to the network device.

For example, for the K REGs in each REG group, it is assumed that the network device uses the same beamforming weights on the K REGs to send dedicated pilot signals and DCI. For M REG groups, it is assumed that the network equipment sends dedicated pilot signals and DCI using different or the same beamforming weights on the M REG groups.

Step 403: The terminal device uses the K dedicated pilot signals carried on each REG group to perform channel estimation on the corresponding REG group, and obtains the channel estimation results of the M REG groups.

Because the network device allocates at least M REG groups in a grouping manner when assigning the PDCCH to the terminal device, and the K REGs included in each REG group occupy consecutive resources in the frequency domain. Therefore, when the terminal device performs channel estimation, it can perform channel estimation for each REG group. For each REG group in the M group, since the resources occupied by the K REGs in the frequency domain are continuous, the terminal device can use the dedicated pilot signals carried on the REG group to perform channel estimation on the REG group to obtain the REG. Group channel estimation results, instead of performing channel estimation on a single REG, improves the accuracy of the channel estimation results.

Step 404: The terminal device processes the DCIs carried on the M REG groups according to the channel estimation results of the M REG groups.

When the terminal device obtains the channel estimation results of the M REG groups, it can use the corresponding channel estimation results to separately process the DCIs carried on the M REG groups, including demodulation processing and decoding processing.

It can be understood that when P> MK, for P-MK REGs in the M + 1th REG group, if P-MK> 1, the terminal device can also perform channel estimation on the M + 1th REG group. And use the channel estimation results to process part of the DCI carried on the M + 1th REG group.

With the method provided in this application, since the P REGs allocated by the network device to the terminal device include at least M REG groups, and the K REGs included in each REG group occupy continuous resources in the frequency domain, therefore, The terminal device can perform channel estimation on the corresponding REG group according to the K dedicated pilot signals carried on each REG group to improve the accuracy of the channel estimation, thereby improving the accuracy of the demodulation of the DCI carried on each REG group. .

The above mainly introduces the solution provided in this application from the perspective of interaction between various network elements. It can be understood that, in order to realize the above functions, the terminal device and the network device include a hardware structure and / or a software module corresponding to each function. Those skilled in the art should easily realize that, with reference to the units and algorithm steps of the various examples described in the embodiments disclosed herein, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is performed by hardware or computer software-driven hardware depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

As shown in FIG. 8, a possible structure diagram of a network device provided by this application includes:

An allocation unit 801 is configured to allocate P REGs to the terminal device, the P REGs include M REG groups, each REG group in the M REG groups includes K REGs, and the K REGs are in a frequency domain The resources occupied on the network are continuous, M≥1, K≥2, P≥MK, M and K are integers.

The sending unit 802 is configured to send a DCI and a dedicated pilot signal on the P REGs allocated by the allocating unit 801, where the dedicated pilot signal is carried on one RE of each REG in the P REGs.

Optionally, the resources occupied by the K REGs in the frequency domain are continuous and include: Except for REs carrying PCFICH, PHICH, and cell-specific reference signals CRS, there are no other bearers between the K REGs carrying other channels. RE.

Optionally, the sequence number of each REG in the mth REG group of the M REG groups is {i _m , i _m + N, ..., i _m + (K-1) N}, and i _m represents Sequence number of the first REG in the mth REG group, N represents the number of interleaver columns that interleave the P REGs, i _m ≥0, 1≤m≤M, both m and i are Positive integer.

Optionally, when P> MK, the P REGs further include an M + 1th REG group, the M + 1th REG group includes P-MK REGs, and the M + 1th REG group The serial numbers of each REG in the sequence are {i _{M + 1} , i _{M + 1} + N, ..., i _{M + 1} + (P-MK-1) N}, and P-MK <K.

Optionally, the value of K is indicated by radio resource control RRC signaling.

Optionally, the M REG groups include B control channel element CCEs, and each CCE in the B CCEs includes L REG groups, M≥BL, L≥1, B≥1, B and L is an integer.

Optionally, the M REG groups include B control channel elements CCE, and the K REGs belong to the K CCEs in the B CCEs, respectively.

As shown in FIG. 9, a possible structure diagram of a terminal device provided by this application includes:

A receiving unit 901 is configured to receive a dedicated pilot signal and DCI sent by a network device on P REGs, where the dedicated pilot signal is carried on one RE of each REG in the P REGs, and the P The REG includes M REG groups, each REG group of the M REG groups includes K REGs, and the resources occupied by the K REGs in the frequency domain are continuous, M≥1, K≥2, and P≥MK , M and K are integers;

A processing unit 902, configured to use the K dedicated pilots carried on each REG group to perform joint channel estimation on corresponding REG groups, and obtain channel estimation results of the M REG groups;

The processing unit 902 is further configured to process the DCIs carried on the M REG groups according to a channel estimation result of the M REG groups.

Optionally, the processing unit 902 is further configured to: before the receiving unit 901 receives dedicated pilot signals and DCIs sent by network equipment on P REGs, for the K REGs in each REG group, It is assumed that the network device sends the dedicated pilot signal and the DCI with the same beamforming weights on the K REGs.

Optionally, the processing unit 901 is further configured to, for the M REG groups, assuming that the network device sends the dedicated pilot signal and the dedicated pilot signals with different beamforming weights on the M REG groups. The DCI.

Optionally, the resources occupied by the K REGs in the frequency domain are continuous, including: except for the REs of PCFICH, PHICH, and CRS, there are no REs carrying other channels between the K REGs.

As shown in FIG. 10, it is a schematic structural diagram of a communication device provided in the present application, including a processor 1001 and a memory 1002.

The processor 1001 may be a central processing unit (CPU), a general-purpose processor 1001, a digital signal processor (DSP), and an application-specific integrated circuit (ASIC). Programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logical blocks, modules, and circuits described in connection with the disclosure of this application. The processor 1001 may also be a combination that realizes computing functions, for example, it includes a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.

Optionally, the communication device may further include a transceiver 1003 for supporting the communication device to perform data transmission, signaling, or information transmission in the data transmission method, for example, receiving or sending DCI and a dedicated pilot signal.

The processor 1001, the transceiver 1003, and the memory 1002 are connected to each other through a bus 1004. The bus 1004 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA). ) Bus and so on. The bus 1004 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only a thick line is used in FIG. 10, but it does not mean that there is only one bus or one type of bus.

The processor 1001 is configured to be coupled to the memory 1002, and read and execute instructions in the memory 1002 to implement the steps performed by the network device in the method embodiment shown in FIG. 4. For details, refer to the related description in the method embodiment shown in FIG. 4, and details are not described herein again.

When the communication device is a terminal device or a part of the terminal device, the processor 1001 is configured to be coupled to the memory 1002, and read and execute the instructions in the memory 1002 to implement the method shown in FIG. 4 Steps performed by the terminal device in the method embodiment. For details, refer to the related description in the method embodiment shown in FIG. 4, and details are not described herein again.

In one example, the steps of the method or algorithm described in connection with the disclosure of the present application may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions. Software instructions can be composed of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), erasable programmable read-only memory ( erasable (programmable ROM, EPROM), electrically erasable programmable read-only memory (EPROM), registers, hard disks, mobile hard disks, read-only optical disks (CD-ROMs), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC can be located in a core network interface device. Of course, the processor and the storage medium can also exist as discrete components in the core network interface device.

In specific implementation, the present application also provides a computer storage medium, where the computer storage medium may store a program, and when executed, the program may include some or all of the steps in the embodiments of the DCI transmission method provided by the application. The storage medium may be a magnetic disk, an optical disk, a read-only memory (English: ROM) or a random access memory (English: random access memory (RAM)).

The present application also provides a computer program product containing instructions, which when executed on a computer, causes the computer to perform some or all of the steps in the embodiments of the data transmission method provided by the present application.

Those skilled in the art can clearly understand that the technology in this application can be implemented by means of software plus a necessary universal hardware platform. Based on this understanding, the technical solutions in this application that are essentially or contribute to the existing technology can be embodied in the form of software products, which can be stored in storage media, such as ROM / RAM, magnetic Disks, compact discs, etc., include several instructions to cause a computer device (which may be a personal computer, a server, or a VPN gateway, etc.) to perform the methods described in various embodiments of the present invention or certain parts of the embodiments.

The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention.

Claims

A method for transmitting a downlink control signal DCI, characterized in that the method includes:

Allocate P resource groups REG to the terminal device, the P REGs include M REG groups, each REG group of the M REG groups includes K REGs, and the K REGs occupy a frequency domain. Resources are continuous, M≥1, K≥2, P≥MK, M and K are integers;

DCI and a dedicated pilot signal are sent on the P REGs, and the dedicated pilot signal is carried on at least one resource unit RE of each REG in the P REGs.
The method according to claim 1, wherein the resources occupied by the K REGs in the frequency domain are continuous, comprising:

Except for REs carrying a physical control channel format indication channel PCFICH, a physical hybrid adaptive retransmission indication channel PHICH, and a cell-specific reference signal CRS, there are no REs carrying other channels between the K REGs.
The method according to claim 1 or 2, wherein a sequence number of each REG in the m-th REG group of the M REG groups is {i m , i m + N, ..., i m + (K-1) N}, i m represents the sequence number of the first REG in the m-th REG group, N represents the number of columns of the interleaver that interleaves the P REGs, i m ≥0, 1≤m≤M, m and i are positive integers.
The method according to claim 3, wherein the serial number i m of the first REG in the m-th REG group satisfies: i m = i 1 + m-1, where i 1 represents the first number in the first REG group. The sequence number of a REG.
The method according to claim 3 or 4, wherein when P> MK, the P REGs further include an M + 1th REG group, and the M + 1th REG group includes P-MK REG, the sequence number of each REG in the M + 1th REG group is {i M + 1 , i M + 1 + N, ..., i M + 1 + (P-MK-1) N}, P-MK <K.
The method according to any one of claims 1 to 5, wherein the value of K is indicated by radio resource control RRC signaling or a media access control unit MAC-CE.
The method according to any one of claims 1-6, wherein the M REG groups include B control channel elements CCE, and each CCE in the B CCEs includes L the REG groups, M≥BL, L≥1, B≥1, B and L are integers.
The method according to any one of claims 1-6, wherein the M REG groups include B control channel elements CCE, and the K REGs belong to the K CCEs in the B CCEs, respectively.
A method for transmitting a downlink control signal DCI, characterized in that the method includes:

Receive dedicated pilot signals and DCIs sent by network equipment on P resource groups REGs, the dedicated pilot signals being carried on at least one resource unit RE of each REG in the P REGs, the P REGs Including M REG groups, each REG group of the M REG groups includes K REGs, and the resources occupied by the K REGs in the frequency domain are continuous, M≥1, K≥2, P≥MK, M and K are integers;

Performing channel estimation on the corresponding REG group by using the dedicated pilot signal carried on each REG group, and obtaining channel estimation results of the M REG groups;

And processing the DCI carried on the M REG groups according to a channel estimation result of the M REG groups.
The method according to claim 9, wherein before the receiving the dedicated pilot signal and DCI sent by the network device on P REGs, the method further comprises:

For the K REGs in each REG group, it is assumed that the network device sends the dedicated pilot signal and the DCI with the same beamforming weights on the K REGs.
The method according to claim 10, wherein:

For the M REG groups, it is assumed that the network device sends the dedicated pilot signal and the DCI by using different beamforming weights on the M REG groups.
The method according to any one of claims 9 to 11, wherein the resources occupied by the K REGs in the frequency domain are continuous, including:

Except for REs carrying a physical control channel format indication channel PCFICH, a physical hybrid adaptive retransmission indication channel PHICH, and a cell-specific reference signal CRS, there are no REs carrying other channels between the K REGs.
The method according to any one of claims 9-12, characterized in that the sequence numbers of each REG in the mth REG group among the M REG groups are in sequence {i m , i m + N, ..., i m + (K-1) N}, i m represents the sequence number of the first REG in the m th REG group, N represents the number of interleaver columns that interleave the P REGs, i m ≥0, 1≤m≤M, m and i are positive integers.
The method according to claim 13, wherein the serial number i m of the first REG in the m-th REG group satisfies: i m = i 1 + m-1, where i 1 represents the first number in the first REG group. The sequence number of a REG.
The method according to claim 11 or 12, wherein when P> MK, the P REGs further include an M + 1th REG group, and the M + 1th REG group includes P-MK REG, the sequence number of each REG in the M + 1th REG group is {i M + 1 , i M + 1 + N, ..., i M + 1 + (P-MK-1) N}, P-MK <K.
The method according to any one of claims 9 to 15, wherein the value of K is indicated by radio resource control RRC signaling or a media access control unit MAC-CE.
The method according to any one of claims 9-16, wherein the M REG groups include B control channel elements CCE, and each CCE in the B CCEs includes L the REG groups, M≥BL, L≥1, B≥1, B and L are integers.
The method according to any one of claims 9-16, wherein the M REG groups include B control channel elements CCE, and the K REGs belong to the K CCEs in the B CCEs, respectively.
A network device, comprising:

An allocation unit, configured to allocate P resource groups REGs to the terminal device, the P REGs include M REG groups, each REG group in the M REG groups includes K REGs, and the K REGs are in frequency The resources occupied by the domain are continuous, M≥1, K≥2, P≥MK, M and K are integers;

A sending unit, configured to send downlink control information DCI and a dedicated pilot signal on the P REGs allocated by the allocation unit, where the dedicated pilot signal carries at least one resource of each REG in the P REGs Unit RE.
The network device according to claim 19, wherein the resources occupied by the K REGs in the frequency domain are continuous, comprising:

Except for REs carrying a physical control channel format indication channel PCFICH, a physical hybrid adaptive retransmission indication channel PHICH, and a cell-specific reference signal CRS, there are no REs carrying other channels between the K REGs.
The network device according to claim 19 or 20, wherein a sequence number of each REG in an m-th REG group among the M REG groups is {i m , i m + N, ..., i m in order + (K-1) N}, i m represents the sequence number of the first REG in the m-th REG group, N represents the number of columns of the interleaver that interleaves the P REGs, i m ≥0 , 1≤m≤M, m and i are positive integers.
The network device according to claim 21, wherein a sequence number i m of the first REG in the m-th REG group satisfies: i m = i 1 + m-1, where i 1 represents a number in the first REG group. Sequence number of the first REG.
The network device according to claim 21 or 22, wherein when P> MK, the P REGs further include an M + 1th REG group, and the M + 1th REG group includes P-MK REGs, the sequence numbers of each REG in the M + 1th REG group are {i M + 1 , i M + 1 + N, ..., i M + 1 + (P-MK-1) N} , P-MK <K.
The network device according to any one of claims 19 to 23, wherein the value of K is indicated by radio resource control RRC signaling or a media access control unit MAC-CE.
The network device according to any one of claims 19 to 24, wherein the M REG groups include B control channel elements CCE, and each CCE of the B CCEs includes L the REG groups , M≥BL, L≥1, B≥1, B and L are integers.
The network device according to any one of claims 19 to 24, wherein the M REG groups include B control channel elements CCE, and the K REGs belong to K CCEs in the B CCEs, respectively .
A terminal device, comprising:

A receiving unit, configured to receive a dedicated pilot signal and a downlink control signal DCI sent by a network device on P resource groups REGs, where the dedicated pilot signal is carried in at least one resource unit of each REG in the P REGs On the RE, the P REGs include M REG groups, each REG group in the M REG groups includes K REGs, and the resources occupied by the K REGs in the frequency domain are continuous, M≥1, K≥2, P≥MK, M and K are integers;

A processing unit, configured to use the dedicated pilot signal carried on each REG group to perform channel estimation on the corresponding REG group, and obtain channel estimation results of the M REG groups;

The processing unit is further configured to process the DCIs carried on the M REG groups according to a channel estimation result of the M REG groups.
The terminal device according to claim 27, wherein

The processing unit is further configured to: before the receiving unit receives the dedicated pilot signal and DCI sent by the network device on P REGs, for the K REGs in each REG group, it is assumed that the network device is in The K REGs use the same beamforming weights to send the dedicated pilot signal and the DCI.
The terminal device according to claim 28, wherein

The processing unit is further configured to, for the M REG groups, assuming that the network device sends the dedicated pilot signal and the DCI by using different beamforming weights on the M REG groups.
The terminal device according to any one of claims 27-29, wherein the resources occupied by the K REGs in the frequency domain are continuous, and include:

Except for REs carrying a physical control channel format indication channel PCFICH, a physical hybrid adaptive retransmission indication channel PHICH, and a cell-specific reference signal CRS, there are no REs carrying other channels between the K REGs.
The terminal device according to any one of claims 27 to 30, wherein the serial numbers of the REGs in the mth REG group of the M REG groups are in sequence {i m , i m + N, ... , I m + (K-1) N}, i m represents the sequence number of the first REG in the m-th REG group, N represents the number of interleaver columns that interleave the P REGs, i m ≥0, 1≤m≤M, m and i are positive integers.
The terminal device according to claim 31, wherein a sequence number i m of the first REG in the m-th REG group satisfies: i m = i 1 + m-1, where i 1 represents a number in the first REG group. Sequence number of the first REG.
The terminal device according to claim 31 or 32, wherein when P> MK, the P REGs further include an M + 1th REG group, and the M + 1th REG group includes P-MK REGs, the sequence numbers of each REG in the M + 1th REG group are {i M + 1 , i M + 1 + N, ..., i M + 1 + (P-MK-1) N} , P-MK <K.
The terminal device according to any one of claims 27 to 33, wherein the value of K is indicated by radio resource control RRC signaling or a media access control unit MAC-CE.
The terminal device according to any one of claims 27-34, wherein the M REG groups include B control channel elements CCE, and each CCE of the B CCEs includes L the REG groups , M≥BL, L≥1, B≥1, B and L are integers.
The terminal device according to any one of claims 27-34, wherein the M REG groups include B control channel elements CCE, and the K REGs belong to K CCEs in the B CCEs, respectively .
A computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are run on a computer, the computer enables the computer to implement the downlink control information DCI according to any one of claims 1-8. Transmission method.
A computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are run on a computer, the computer enables the computer to implement the downlink control information DCI according to any one of claims 9-18. Transmission method.