CN112929967B - Network device and communication method thereof - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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Abstract
The disclosure provides a network device and a communication method thereof, and relates to the field of wireless communication. The method and the device can improve the DMRS frequency domain density of the PDCCH by configuration according to service requirements, thereby improving the estimation precision of channel and interference covariance, improving the decoding accuracy of the PDCCH and helping to realize the reliability of the URLLC service.
Description
Technical Field
The present disclosure relates to the field of wireless communications, and in particular, to a network device and a communication method thereof.
Background
NR (New Radio, new air interface) PDCCH (Physical Downlink Control Channel) may be used to schedule PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel) data transmission, and its performance has very important performance for the overall reliability of URLLC (Ultra Reliable Low Latency Communications).
PDCCH DMRS (Demodulation Reference Signal) channel estimation performance has an important influence on PDCCH. Meanwhile, the DMRS frequency domain density of the NR PDCCH is fixed to 1/4 in consideration of DMRS overhead and DCI (Downlink control information) code rate.
Channel and interference covariance estimation performance based on this DMRS may deteriorate significantly in the following scenarios:
when the terminal adopts 4 receiving antennas, the number of channels and covariance estimation needs 4 and 10 respectively, when the DMRS density is low, the number of samples is small, and the estimation error is large. For example, when the REG (Resource element group) bundle size is 2, the performance deteriorates by 3-5dB.
For users at the edge of a cell or indoors, the SNR (Signal-to-Noise Ratio) operating point is low, the channel estimation error is significantly increased, and the demodulation performance is still insufficient when the PDCCH code rate is low.
Disclosure of Invention
The method and the device can provide various DMRS frequency domain densities of the PDCCH which can be configured and selected, and can improve the DMRS frequency domain density of the PDCCH by configuration according to service requirements, thereby improving the estimation precision of channel and interference covariance, improving the decoding accuracy of the PDCCH and helping to realize the reliability of the URLLC service.
Some embodiments of the present disclosure propose a communication method, comprising:
network equipment schedules a Physical Downlink Control Channel (PDCCH) of a user terminal in a control resource set;
and the network equipment configures the control resource set, and adds DMRS frequency domain density information of a PDCCH in the configuration information of the control resource set, wherein a plurality of DMRS frequency domain density information which can be selected by configuration are available.
In some embodiments, DMRS frequency domain density information available for configuration selection includes at least two of 1/4,1/3, 1/2; when the DMRS frequency domain density information is 1/4, 3 resource particles which are uniformly distributed in 1 resource block are used as demodulation reference signals; when the DMRS frequency domain density information is 1/3, 4 resource particles which are uniformly distributed in 1 resource block are demodulation reference signals; when the frequency domain density information of the DMRS is 1/2, 6 resource particles which are uniformly distributed in 1 resource block are used as demodulation reference signals.
In some embodiments, the network device configures DMRS frequency domain density information in different control resource sets independently.
In some embodiments, the network device configures different DMRS frequency domain density information for different sets of control resources.
In some embodiments, the network device configures DMRS frequency-domain density information based on at least one of current channel conditions of the user terminal and reliability requirements of the user.
In some embodiments, the worse the current channel condition of the user terminal is, the higher the configured DMRS frequency domain density information is; the higher the reliability requirement of the user is, the higher the configured DMRS frequency domain density information is.
In some embodiments, DMRS frequency domain density information of PDCCHs for a plurality of users may be configured in the same control resource set, wherein users having reliability requirements higher than a preset condition for the users and/or having current channel conditions worse than the preset condition for the user terminal are configured in the same control resource set, and are configured with DMRS frequency domain density information higher than a preset degree; the users with reliability requirements lower than the preset condition and/or the current channel condition of the user terminal better than the preset condition are configured in the same control resource set, and the DMRS frequency domain density information lower than the preset degree is configured.
In some embodiments, the current channel condition of the user terminal is determined from a three-layer filtered reference signal received power, RSRP, or reference signal received quality, RSRQ.
In some embodiments, the network device configures the set of control resources using radio resource control protocol, RRC, signaling.
Some embodiments of the present disclosure provide a network device, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the communication method of any of the embodiments based on instructions stored in the memory.
Some embodiments of the disclosure propose a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the communication method described in any one of the embodiments.
Drawings
The drawings that are required to be used in the embodiments or the related art description will be briefly described below. The present disclosure will be more clearly understood from the following detailed description, which proceeds with reference to the accompanying drawings,
it is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without undue inventive faculty.
Fig. 1 shows a schematic diagram of a PDCCH of the present disclosure having a DMRS frequency domain density of 1/4.
Fig. 2 shows a schematic diagram of DMRS frequency domain density of PDCCH of the present disclosure being 1/3.
Fig. 3 shows a schematic diagram of a PDCCH of the present disclosure with a DMRS frequency domain density of 1/2.
Fig. 4 is a flow diagram of some embodiments of the disclosed communication method.
Fig. 5 is a schematic structural diagram of some embodiments of a network device of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure.
As mentioned above, NR PDCCH can be used to schedule PDSCH and PUSCH data transmission, and its performance has very important performance for the overall reliability of URLLC.
The Control channel Resource of one PDCCH is called CORESET (Control Resource Set), and its frequency domain structure is as follows:
time domain: it takes 1-3 OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the starting OFDM symbol can be flexibly configured by a high level of flexibility.
Frequency domain: the system is composed of N RBGs (Resource block groups), and multiple RBGs may be continuous or discontinuous in the frequency domain.
In addition, there may be 3 (or less) CORESET per Bandwidth Part (Bandwidth portion, a subset over the entire Bandwidth). Each REG (Resource element group) bundle may consist of 2,3,6 REGs, and the same precoding may be used in each REG bundle, i.e. the receiving end may perform joint channel estimation.
DMRS (also called demodulation pilot) of PDCCH is a pseudo random sequence and is used for related demodulation of PUSCH and PUCCH (Physical Uplink Control Channel) channels. In the present disclosure, there are a plurality of DMRS frequency domain density information available for configuration selection, thereby implementing a flexible DMRS frequency domain density structure of a PDCCH. For example, DMRS frequency domain density information available for configuration selection includes 1/4,1/3,1/2, and so on. Referring to fig. 1-3, white blocks represent DMRSs, and black blocks represent PDCCH.
As shown in fig. 1, when the DMRS frequency domain density information is 1/4, 3 resource elements RE uniformly distributed in 1 resource block RB are demodulation reference signals.
As shown in fig. 2, when DMRS frequency domain density information is 1/3, 4 resource elements uniformly distributed in 1 resource block are demodulation reference signals;
as shown in fig. 3, when DMRS frequency domain density information is 1/2, 6 resource elements uniformly distributed in 1 resource block are demodulation reference signals.
And adding DMRS frequency domain density information of the PDCCH in the configuration information of the control resource set to inform a User Equipment (UE) of the DMRS frequency domain density of the current control resource set. The DMRS frequency domain density information in different control resource sets is configured independently, and different DMRS frequency domain density information can be configured for different control resource sets. One control resource set is configured with one DMRS frequency domain density information, namely the DMRS frequency domain densities of the same control resource set are the same.
Fig. 4 is a flow diagram of some embodiments of the disclosed communication method.
As shown in fig. 4, the communication method of the embodiment includes:
in step 410, the network device schedules the PDCCH of a certain user terminal in a certain control resource set.
The network device may be a base station or an evolved node or a transceiving node, etc., but is not limited to these devices.
In step 420, the network device configures the control resource set, and adds DMRS frequency domain density information of the PDCCH in the configuration information of the control resource set. As described above, there are multiple pieces of DMRS frequency domain density information available for configuration selection, and one of the DMRS frequency domain densities may be configured for the user terminal, so as to inform the user terminal of the DMRS frequency domain density of the current control resource set, so that the network device and the user terminal communicate with each other according to the indication of the control resource set. For example, the user terminal determines the position of the resource element where the DMRS is located according to the DMRS frequency domain density, and if DMRS transmission is required, transmits the DMRS on the resource element at the corresponding position, so that the network device acquires the DMRS, and demodulates channels such as a PUSCH and a PUCCH.
The network device may configure the Control Resource set by using an improved higher layer signaling, such as a Radio Resource Control (RRC) signaling. For example, RRC signaling is modified to increase DMRS frequency domain density information. In the related art, such as Rel-15, DMRS frequency domain density of PDCCH is fixed without RRC signaling.
If there are multiple control resource sets, the network device configures DMRS frequency domain density information in different control resource sets independently, for example, the network device configures different DMRS frequency domain density information for different control resource sets as needed.
And the network equipment configures the DMRS frequency domain density information according to at least one of the current channel condition of the user terminal and the reliability requirement of the user. The worse the current channel condition of the user terminal is, the higher the configured DMRS frequency domain density information is; the higher the reliability requirement of the user is, the higher the configured DMRS frequency domain density information is. The current channel condition of the ue is determined according to three layers (L3) of filtered RSRP (Reference Signal Receiving Power) or RSRQ (Reference Signal Receiving Quality).
DMRS frequency domain density information for PDCCHs of a plurality of users may be configured in the same control resource set. For example, users whose reliability requirements are higher than a preset condition and/or whose current channel conditions of the user terminal are worse than the preset condition are configured in the same control resource set, and a kind of DMRS frequency domain density information higher than a preset degree is configured, that is, users whose reliability requirements are higher and/or whose current channel conditions of the user terminal are worse are configured in the same control resource set with higher DMRS frequency domain density. For another example, users whose reliability requirements are lower than the preset condition and/or whose current channel conditions of the user terminal are better than the preset condition are configured in the same control resource set, and are configured with DMRS frequency domain density information lower than the preset degree. That is, users with lower reliability requirements and/or better current channel conditions of the user terminal are configured in the same control resource set with lower DMRS frequency domain density.
Taking URLLC users and eMBB (Enhanced Mobile Broadband) users as examples, reliability requirements of URLLC users are higher than that of eMBB users. Some application examples are as follows:
first, a PDCCH for URLLC data scheduling, especially a PDCCH for a user with poor channel conditions such as a cell edge, is configured in the same CORESET. The size of the CORESET, namely the size of the frequency resource, can be flexibly configured according to the number of the URLLC users.
Secondly, configuring the DMRS density of the PDCCH according to the channel condition of the URLLC user, and informing the DMRS frequency domain density in RRC signaling configuring the CORESET. Considering RRC signaling non-dynamic real-time, here the channel condition of the URRLC user considers L3 filtered RSRP or RSRQ, etc.
And thirdly, for URLLC users with poor channel conditions, the DMRS frequency domain density is improved (for example, improved to 1/3 or 1/2), and for URLLC users and eMBB users with better channel conditions, the DMRS frequency domain density is not changed and can still be 1/4, so that the influence on the change of the whole standard and the realization of a chip algorithm is reduced.
Suppose there are 10 users in a target cell, 6 of them are scheduled in a time slot, UE1, UE2, UE3, UE4, UE5 and UE6 respectively. Wherein,
UE1 is URLLC service with reliability requirement of 10 -6 The channel condition is poor;
UE2 is URLLC service, and the reliability requirement is 10 -6 The channel condition is moderate;
UE3 is URLLC service with reliability requirement of 10 -5 The channel condition is poor;
UE4 is URLLC service with reliability requirement of 10 -5 The channel condition is moderate;
the UE5 is eMBB service, and the channel condition is poor;
the UE6 is an eMBB service, and the channel condition is moderate.
According to the scheme disclosed by the invention, the PDCCH of the UE1 can be scheduled in the same CORESET, and the frequency domain density of the DMRS of the PDCCH in the CORESET is configured to be 1/2 through RRC signaling; the PDCCH of the UE2 and the PDCCH of the UE3 are scheduled in a second CORESET, and the frequency domain density of the PDCCH DMRS in the CORESET is configured to be 1/3 through RRC signaling; and the PDCCHs of the UE4, the UE5 and the UE6 are scheduled in a third CORESET, and the DMRS frequency domain density of the PDCCHs in the CORESET is configured to be 1/4 through RRC signaling. These are merely a few example configurations and are not intended to limit the present disclosure.
The embodiment provides various DMRS frequency domain densities of the PDCCH which can be configured and selected, and the DMRS frequency domain density of the PDCCH can be improved by configuration according to service requirements, so that the estimation precision of channel and interference covariance is improved, the decoding accuracy of the PDCCH is improved, and the reliability of the URLLC service is facilitated.
Fig. 5 is a schematic structural diagram of some embodiments of a network device of the present disclosure.
As shown in fig. 5, the network device 500 of this embodiment includes: a memory 510 and a processor 520 coupled to the memory 510, the processor 520 being configured to perform the communication method of any of the foregoing embodiments based on instructions stored in the memory 510.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A method of communication, comprising:
network equipment schedules a Physical Downlink Control Channel (PDCCH) of a user terminal in a control resource set;
the network equipment configures the control resource set, and adds demodulation reference signal (DMRS) frequency domain density information of a PDCCH in the configuration information of the control resource set, wherein a plurality of DMRS frequency domain density information can be selected for configuration,
and the network equipment configures the DMRS frequency domain density information according to at least one of the current channel condition of the user terminal and the reliability requirement of the user.
2. The method of claim 1,
the DMRS frequency domain density information available for configuration selection includes at least two of 1/4,1/3, 1/2;
when the frequency domain density information of the DMRS is 1/4, 3 resource particles which are uniformly distributed in 1 resource block are used as demodulation reference signals; when the DMRS frequency domain density information is 1/3, 4 resource particles which are uniformly distributed in 1 resource block are demodulation reference signals; when the frequency domain density information of the DMRS is 1/2, 6 resource particles which are uniformly distributed in 1 resource block are used as demodulation reference signals.
3. The method of claim 1,
and the network equipment respectively and independently configures the DMRS frequency domain density information in different control resource sets.
4. The method of claim 3,
and the network equipment configures different DMRS frequency domain density information for different control resource sets.
5. The method of claim 1,
the worse the current channel condition of the user terminal is, the higher the configured DMRS frequency domain density information is;
the higher the reliability requirement of the user is, the higher the configured DMRS frequency domain density information is.
6. The method according to claim 5 or 1,
DMRS frequency domain density information for PDCCHs of multiple users may be configured in the same control resource set,
the method comprises the steps that users with reliability requirements higher than a preset condition and/or current channel conditions of a user terminal worse than the preset condition are configured in the same control resource set, and DMRS frequency domain density information higher than a preset degree is configured;
the users with reliability requirements lower than the preset condition and/or the current channel condition of the user terminal better than the preset condition are configured in the same control resource set, and the DMRS frequency domain density information lower than the preset degree is configured.
7. The method according to claim 5 or 1,
the current channel condition of the user terminal is determined according to the reference signal received power RSRP or the reference signal received quality RSRQ after the three-layer filtering.
8. The method according to any one of claims 1 to 5,
the network device configures the set of control resources using radio resource control protocol, RRC, signaling.
9. A network device, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the communication method of any of claims 1-8 based on instructions stored in the memory.
10. A non-transitory computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the communication method according to any one of claims 1 to 8.
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