CN113472506B - Downlink beam management method, base station and terminal - Google Patents

Downlink beam management method, base station and terminal Download PDF

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Publication number
CN113472506B
CN113472506B CN202110721859.1A CN202110721859A CN113472506B CN 113472506 B CN113472506 B CN 113472506B CN 202110721859 A CN202110721859 A CN 202110721859A CN 113472506 B CN113472506 B CN 113472506B
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China
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ssb
base station
target terminal
target
wave beam
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CN113472506A (en
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张敏
江世宇
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CICT Mobile Communication Technology Co Ltd
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CICT Mobile Communication Technology Co Ltd
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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
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • 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
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a downlink wave beam management method, a base station and a terminal, wherein the method comprises the following steps: receiving an access request sent by a target terminal through a first SSB wave beam; under the condition that the number of accessed terminals does not exceed a threshold value, allocating target CSI-RS resources for a target terminal, and sending the target CSI-RS to the target terminal through a first SSB wave beam; and sending downlink service information and control signaling to the target terminal through the first SSB wave beam. According to the downlink wave beam management method, the base station and the terminal, the SSB wave beam sent by the base station does not carry the CSI-RS, the base station sends the target CSI-RS to the target terminal through the first SSB wave beam, and sends the downlink service information and the control signaling to the target terminal through the first SSB wave beam, when the downlink wave beam is managed, the occupied time-frequency resources are less, the interference to the adjacent region can be avoided, and the communication quality of the 5G NR can be improved.

Description

Downlink beam management method, base station and terminal
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a downlink beam management method, a base station, and a terminal.
Background
Under a high-frequency-band scene, the 5G NR can improve the cell coverage distance through beamforming, realize multi-user space division and improve the frequency spectrum utilization rate, thereby meeting the requirements of more diversified scenes.
In the conventional management of the downlink beam in 5G NR, a base station may be configured with a plurality of SSBs (Synchronization Signal and pbcblock). Each SSB transmits in a narrow beam, and the beam scanning direction of each SSB beam is different. The base station may cover the entire cell through SSB beam polling scanning. Each SSB beam carries a CSI-RS (Channel state information Reference Signal), and before the base station sends downlink service information and a control signaling to the terminal through the SSB beam corresponding to the terminal, the terminal performs Channel state measurement and/or Channel state reporting according to the received CSI-RS. However, the CSI-RS carried by each SSB beam occupies more time-frequency resources, which may affect the communication quality of the 5G NR.
Disclosure of Invention
The invention provides a downlink beam management method, a base station and a terminal, which are used for solving the defect that CSI-RS carried by each SSB beam occupies more time-frequency resources in the prior art and realizing the purpose that less time-frequency resources are occupied when downlink beams are managed.
The invention provides a downlink wave beam management method, which comprises the following steps:
receiving an access request sent by a target terminal through a first SSB wave beam;
under the condition that the number of accessed terminals does not exceed a threshold value, allocating target CSI-RS resources for the target terminal, and sending the target CSI-RS to the target terminal through the first SSB wave beam;
and sending downlink service information and control signaling to the target terminal through the first SSB wave beam.
According to a downlink beam management method provided by the present invention, after sending downlink service information and control signaling to the target terminal through the first SSB beam, the method further includes:
receiving target information sent by the target terminal through a second SSB wave beam;
transmitting a target CSI-RS to the target terminal through the second SSB beam on a condition that the transmission direction of the second SSB beam is different from that of the first SSB beam;
and sending downlink service information and control signaling to the target terminal through the second SSB wave beam.
According to a downlink beam management method provided by the present invention, the sending downlink service information and control signaling to the target terminal through the first SSB beam specifically includes:
sending downlink service information and control signaling carried by a physical downlink shared channel and control signaling carried by a physical downlink control channel to the target terminal through the first SSB wave beam;
wherein the base station does not configure tci-PresentInDCI field.
According to a downlink beam management method provided by the present invention, the sending downlink service information and control signaling to the target terminal through the second SSB beam specifically includes:
sending downlink service information and control signaling carried by a physical downlink shared channel and control signaling carried by a physical downlink control channel to the target terminal through the second SSB wave beam;
wherein the base station does not configure tci-PresentInDCI field.
The invention also provides a downlink beam management method, which comprises the following steps:
sending an access request to a base station through the first SSB beam, so that after the base station receives the access request, under the condition that the number of accessed terminals does not exceed a threshold value, a target CSI-RS resource is allocated to a target terminal, and the target CSI-RS is sent to the target terminal through the first SSB beam;
receiving a target CSI-RS sent by the base station through the first SSB beam;
and receiving downlink service information and control signaling sent by the base station through the first SSB wave beam.
According to a downlink beam management method provided by the present invention, after receiving downlink service information and control signaling sent by the base station through the first SSB beam, the method further includes:
transmitting target information to the base station through a second SSB beam, so that the base station transmits a target CSI-RS to the target terminal through the second SSB beam when the transmission directions of the second SSB beam and the first SSB beam are different;
receiving a target CSI-RS sent by the base station through the second SSB wave beam;
and receiving downlink service information and control signaling sent by the base station through the second SSB wave beam.
The present invention also provides a base station, including:
the receiving request module is used for receiving an access request sent by a target terminal through a first SSB wave beam;
a channel reporting module, configured to allocate a target CSI-RS resource to the target terminal and send the target CSI-RS to the target terminal through the first SSB beam, when the number of accessed terminals does not exceed a threshold;
and the information sending module is used for sending downlink service information and control signaling to the target terminal through the first SSB wave beam.
The present invention also provides a terminal, comprising:
a detection module, configured to send an access request to a base station through the first SSB beam, so that after the base station receives the access request, a target CSI-RS resource is allocated to a target terminal when the number of accessed terminals does not exceed a threshold, and the target CSI-RS is sent to the target terminal through the first SSB beam;
a reporting module, configured to receive a target CSI-RS sent by the base station through the first SSB beam;
and the receiving module is used for receiving the downlink service information and the control signaling which are sent by the base station through the first SSB wave beam.
The present invention also provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the downlink beam management methods described above when executing the program.
The present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the downlink beam management method as described in any of the above.
According to the downlink wave beam management method, the base station and the terminal, the SSB wave beam sent by the base station does not carry the CSI-RS, the base station sends the target CSI-RS to the target terminal through the first SSB wave beam, and sends the downlink service information and the control signaling to the target terminal through the first SSB wave beam, when the downlink wave beam is managed, the occupied time-frequency resources are less, the interference to the adjacent region can be avoided, and the communication quality of the 5G NR can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a downlink beam management method according to the present invention;
fig. 2 is a flowchart illustrating a conventional downlink beam management method;
fig. 3 is a second schematic flowchart of a downlink beam management method according to the present invention;
fig. 4 is a second flowchart of a conventional downlink beam management method;
fig. 5 is a third schematic flow chart of a downlink beam management method according to the present invention;
fig. 6 is a fourth schematic flowchart of a downlink beam management method provided in the present invention;
fig. 7 is a schematic structural diagram of a base station provided in the present invention;
fig. 8 is a schematic structural diagram of a terminal provided by the present invention;
fig. 9 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic flow chart of a downlink beam management method according to the present invention. The downlink beam management method of the present invention is described below with reference to fig. 1. As shown in fig. 1, the method includes: step 101, receiving an access request sent by a target terminal through a first SSB beam.
It should be noted that the main execution unit in the embodiment of the present invention is a base station.
The base station can configure a target number of SSBs, each SSB is transmitted through a narrow beam, the transmitting directions of any two SSB beams are different, and the base station can cover the whole cell through SSB beam polling scanning before the target terminal accesses the base station.
It should be noted that any SSB beam transmitted by the base station in the embodiment of the present invention does not carry CSI-RS.
It should be noted that the target terminal is a terminal that requests to establish a connection with the base station. The terminal may be an electronic device having a communication function and capable of being used in a mobile, for example: smart phones, tablet computers, notebook computers, or the like.
It should be noted that the target number of the SSBs configured by the base station can be determined according to actual situations. However, in general, the base station in the 5G NR can configure 64 SSBs at most, and therefore the value range of the target number is greater than or equal to 1 and less than or equal to 64.
Before the target terminal establishes a connection with the base station, the target terminal may detect an SSB beam transmitted by the base station. The target terminal may detect one or more SSB beams.
After the target terminal detects one or more SSB beams, it may determine whether the SSB beams satisfy a Reference Signal Receiving Power (RSRP) threshold, and determine an SSB beam as a first SSB beam based on the SSB beams satisfying the RSRP threshold.
Specifically, in the case where only one SSB beam detected by the target terminal satisfies the RSRP threshold, the SSB beam is taken as the first SSB beam.
When the SSB beams detected by a plurality of target terminals satisfy the RSRP threshold, the strongest SSB beam of the plurality of SSB beams may be used as the first SSB beam; alternatively, any one of the plurality of SSB beams may be the first SSB beam.
It should be noted that RSRP is one of the key parameters representing the radio signal strength and the key requirements of physical layer measurement. The RSRP threshold in the embodiment of the present invention may be determined according to actual situations. The specific value of the RSRP threshold is not limited in the embodiment of the present invention.
The target terminal may send an access request to the base station over the first SSB beam.
The base station may receive the access request sent by the target terminal through the first SSB beam.
And 102, under the condition that the number of the accessed terminals does not exceed a threshold value, allocating target CSI-RS resources for the target terminal, and sending the target CSI-RS to the target terminal through the first SSB wave beam.
Specifically, the base station may obtain the number of currently accessed terminals, and determine whether the number of currently accessed terminals exceeds a threshold.
If the number of the currently accessed terminals is judged and known not to exceed the threshold value, the base station can allocate target CSI-RS resources to the target terminal and send the target CSI-RS to the target terminal through the first SSB wave beam.
It should be noted that, in the embodiment of the present invention, the target CSI-RS resource allocated by the base station for the target terminal is a CSI-RS resource dedicated to the target terminal.
After the target terminal receives the target CSI-RS sent through the first SSB beam, the target terminal may obtain the state information of the current channel based on the target CSI-RS sent through the first SSB beam, and may return the obtained state information of the current channel to the base station.
It should be noted that the target CSI-RS sent through the BBS beams in different transmission directions corresponds to different channels.
Step 103, sending downlink service information and control signaling to the target terminal through the first SSB beam
Specifically, the base station may send downlink traffic information and control signaling to the target terminal through the first SSB beam.
Fig. 2 is a flowchart illustrating a conventional downlink beam management method. As shown in fig. 2, the base station is configured with 64 SSBs. SSB beams for each transmission direction are represented by SSB # i, and i is greater than or equal to 0 and less than or equal to 63.
Before the target terminal accesses the base station, each SSB wave beam transmitted by the base station carries CSI-RS, so that the base station needs to configure 64 CSI-RS resources. And the CSI-RS carried by each SSB beam is represented by CSI-RS # i.
After detecting each SSB beam sent by the base station, the target terminal detects that the SSB #1 beam is the strongest SSB beam and the SSB #1 beam satisfies the RSRP threshold. The target terminal sends an access request to the base station through the SSB #1 beams, each SSB beam transmitted by the base station still carries the CSI-RS, and the target terminal receives the CSI-RS #1 carried by the SSB #1 beams.
The CSI-RS carried by each SSB wave beam transmitted by the base station occupies more time-frequency resources, and does not conform to the design principle of reducing 'always-on' signals in 5G NR as much as possible, and the CSI-RS carried by each SSB wave beam causes stronger adjacent cell interference and influences the communication quality of the 5G NR.
Fig. 3 is a second flowchart of the downlink beam management method according to the present invention. As shown in fig. 3, in the downlink beam management method of the present invention, before the target terminal accesses the base station, each SSB beam sent by the base station does not carry a CSI-RS.
After the target terminal detects each SSB beam sent by the base station, it detects that the SSB #1 beam is the strongest SSB beam and the SSB #1 beam satisfies the RSRP threshold. The target terminal sends an access request to the base station through the SSB #1 wave beam, the base station sends the target CSI-RS to the target terminal through the SSB #1 wave beam, and the SSB wave beams in other transmitting directions still do not carry the CSI-RS, so that the occupation of time-frequency resources can be reduced, and the interference of adjacent regions can be reduced.
In the embodiment of the invention, the SSB wave beam sent by the base station does not carry the CSI-RS, the base station sends the target CSI-RS to the target terminal through the first SSB wave beam, and sends the downlink service information and the control signaling to the target terminal through the first SSB wave beam, so that when the downlink wave beam is managed, less time-frequency resources are occupied, the interference to the adjacent region can be avoided, and the communication quality of the 5G NR can be improved.
Based on the content of the foregoing embodiments, after sending the downlink service information and the control signaling to the target terminal through the first SSB beam, the method further includes: and receiving target information sent by the target terminal through the second SSB wave beam.
Specifically, when the position of the target terminal is changed or an obstacle occurs between the target terminal and the base station, the SSB beam detected by the target terminal changes.
Under the condition that the SSB wave beam detected by the target terminal changes, whether the currently detected SSB wave beam meets the RSRP threshold value can be judged.
And in the case that only one SSB beam currently detected by the target terminal meets the RSRP threshold, taking the SSB beam as a second SSB beam.
When a plurality of SSB beams currently detected by the target terminal satisfy the RSRP threshold, the strongest SSB beam of the plurality of SSB beams may be used as the second SSB beam; alternatively, any one of the plurality of SSB beams may be used as the second SSB beam.
The base station may receive target information transmitted by the target terminal through the second SSB beam.
It should be noted that the target information may be a beam measurement result obtained by the target terminal by measuring a BBS beam transmitted by the base station.
And under the condition that the transmission direction of the second SSB beam is different from that of the first SSB beam, transmitting the target CSI-RS to the target terminal through the second SSB beam.
After receiving the target information sent by the target terminal through the second SSB beam, the base station may determine whether the transmission directions of the second SSB beam and the first SSB beam are the same.
And if the transmitting direction of the second SSB wave beam is different from that of the first SSB wave beam, the base station can send the target CSI-RS to the target terminal through the second SSB wave beam.
After receiving the target CSI-RS sent by the base station through the second SSB beam, the target terminal may obtain state information of the current channel based on the target CSI-RS, and may return the obtained state information of the current channel to the base station.
It should be noted that, if it is determined that the transmission direction of the second SSB beam is the same as that of the first SSB beam, the base station may still transmit the target CSI-RS to the target terminal through the first SSB beam.
And sending downlink service information and control signaling to the target terminal through the second SSB wave beam.
Specifically, the base station may send downlink traffic information and control signaling to the target terminal through the second SSB beam.
Fig. 4 is a second flowchart of a conventional downlink beam management method. As shown in fig. 4, the target terminal moves from the location in fig. 2 to the current location.
And after the target terminal moves to the current position, the target terminal sends target information to the base station through the SSB #2 wave beam, and each SSB wave beam transmitted by the base station still carries the CSI-RS. The base station further needs to send reconfiguration information to the target terminal and send CSI-RS #2 carried by the SSB #2 beam to the target terminal through the SSB #2 beam, thereby increasing additional signaling overhead, and especially in a scenario where the beam corresponding to the target terminal is frequently adjusted, the additional signaling overhead further increases, increases communication load, and increases interference to the neighboring cell.
Fig. 5 is a third flowchart of a downlink beam management method according to the present invention. As shown in fig. 5, in the downlink beam management method of the present invention, after the target terminal moves to the current location, the target terminal transmits target information to the base station through the SSB #2 beam.
After receiving the target information sent by the target terminal through the SSB #2 wave beam, the base station determines that the SSB #2 wave beam is different from the transmitting wave beam of the SSB #1 wave beam, the base station sends the target CSI-RS to the target terminal through the SSB #2 wave beam, and the SSB wave beams in other transmitting directions do not carry the target CSI-RS, so that the occupation of time-frequency resources can be reduced, the signaling overhead is reduced, and the interference of adjacent regions is reduced.
In the embodiment of the invention, under the condition that the position of the target terminal is changed or an obstacle occurs between the target terminal and the base station, the SSB wave beam which is sent by the base station and does not carry the CSI-RS is detected again through the target terminal, the target information is sent to the base station through the second SSB wave beam, the base station sends the target CSI-RS to the target terminal through the second SSB wave beam under the condition that the transmitting direction of the second SSB wave beam is different from that of the first SSB wave beam, and the base station sends the downlink service information and the control signaling to the target terminal through the second SSB wave beam.
Based on the content of the foregoing embodiments, sending downlink service information and a control signaling to a target terminal through a first SSB beam specifically includes: and sending downlink service information and control signaling carried by a physical downlink shared channel and control signaling carried by a physical downlink control channel to the target terminal through the first SSB wave beam.
Wherein the base station does not configure tci-PresentInDCI field.
Specifically, according to the 3Gpp 38331 protocol, the high layer parameter tci-PresentInDCI may indicate whether a tci (tag Control information) field exists in Downlink Control Information (DCI). If the TCI-PresentInDCI is configured to be enabled, the TCI field in the DCI exists and has a length of 3bit, which may indicate a transmission beam of Downlink traffic information and control signaling carried by a Physical Downlink Shared Channel (PDSCH) and a transmission direction of the transmission beam; if TCI-PresentInDCI is not configured, the length of the TCI field in the DCI is 0, which indicates that the target terminal receives a Control signaling carried by a Physical Downlink Control Channel (PDCCH) through the same transmission beam as the PDSCH.
In the existing downlink beam management, tci-PresentInDCI is configured as enabled, on one hand, a target terminal may receive downlink service information and a control signaling through a beam indicated by DCI, and receive a control signaling carried by a PDSCH through the beam indicated by DCI, and the target terminal needs a certain time for beam adjustment and has a certain requirement on the capability of the target terminal. On the other hand, downlink service information and control signaling carried by the PDCCH are mapped to resource units together with PDCCH DM-RS through operations such as CRC scrambling, CRC interleaving, RNTI encoding, polarization code encoding, rate matching, scrambling, modulation and the like, and are transmitted through the base station, when tci-PresentInDCI is configured to be enabled, the information quantity carried by the PDCCH becomes more, the error rate during decoding is increased, and the success rate of PDCCH demodulation is influenced.
In the embodiment of the invention, the base station does not configure tci-PresentInDCI field, and sends the downlink service information and the control signaling carried by the physical downlink shared channel and the control signaling carried by the physical downlink control channel to the target terminal through the first SSB wave beam.
The embodiment of the invention can reduce the error rate when the physical downlink shared channel is decoded and improve the success rate of demodulation by not configuring tci-PresentInDCI field and sending the downlink service information and the control signaling carried by the physical downlink shared channel and the control signaling carried by the physical downlink control channel through the first SSB wave beam.
Based on the content of the foregoing embodiments, sending downlink service information and a control signaling to a target terminal through a second SSB beam specifically includes: and sending the downlink service information and the control signaling carried by the physical downlink shared channel and the control signaling carried by the physical downlink control channel to the target terminal through the second SSB wave beam.
Wherein the base station does not configure tci-PresentInDCI field.
Specifically, after the location of the target terminal is changed, the base station may send, to the target terminal, the downlink traffic information and the control signaling carried by the physical downlink shared channel and the control signaling carried by the physical downlink control channel through the second SSB beam without configuring the tci-PresentInDCI field.
In the embodiment of the invention, under the condition that the position of the target terminal is changed, the tci-PresentInDCI field is not configured, and the downlink service information and the control signaling carried by the physical downlink shared channel and the control signaling carried by the physical downlink control channel are sent through the second SSB wave beam, so that the error rate in the decoding process of the physical downlink shared channel can be reduced, and the success rate of demodulation is improved.
Fig. 6 is a fourth flowchart illustrating a downlink beam management method according to the present invention. The downlink beam management method of the present invention is described below with reference to fig. 6. As shown in fig. 6, the method includes: step 601, sending an access request to the base station through the first SSB beam, so that after the base station receives the access request, a target CSI-RS resource is allocated to the target terminal under the condition that the number of accessed terminals does not exceed a threshold, and the target CSI-RS is sent to the target terminal through the first SSB beam.
It should be noted that the execution subject of the embodiment of the present invention is a target terminal.
Before the target terminal establishes a connection with the base station, the target terminal may detect an SSB beam transmitted by the base station. The target terminal may detect one or more SSB beams.
After the target terminal detects one or more SSB beams, it may determine whether the SSB beams satisfy a Reference Signal Receiving Power (RSRP) threshold, and determine an SSB beam as a first SSB beam based on the SSB beams satisfying the RSRP threshold.
Specifically, in the case where only one SSB beam detected by the target terminal satisfies the RSRP threshold, the SSB beam is taken as the first SSB beam.
When the SSB beams detected by a plurality of target terminals satisfy the RSRP threshold, the strongest SSB beam of the plurality of SSB beams may be used as the first SSB beam; alternatively, any one of the plurality of SSB beams may be the first SSB beam.
The target terminal may send an access request to the base station over the first SSB beam.
And step 602, receiving the target CSI-RS sent by the base station through the first SSB beam.
The base station receives an access request sent by a target terminal, and after determining that the number of the currently accessed terminals does not exceed a threshold value, the base station can send a target CSI-RS to the target terminal through a first SSB wave beam.
The target terminal may receive a target CSI-RS sent by the base station through the first SSB beam, and may acquire state information of a current channel based on the target CSI-RS.
After the target terminal acquires the state information of the current channel, the acquired state information of the current channel may be returned to the base station.
Step 603, receiving the downlink service information and the control signaling sent by the base station through the first SSB beam
The base station can send downlink service information and control signaling to the target terminal through the first SSB wave beam.
The target terminal may receive downlink traffic information and control signaling sent by the base station through the first SSB beam.
In the embodiment of the invention, the SSB wave beam sent by the base station does not carry the CSI-RS, the base station sends the target CSI-RS to the target terminal through the first SSB wave beam, and sends the downlink service information and the control signaling to the target terminal through the first SSB wave beam, so that when the downlink wave beam is managed, the occupied time-frequency resources are less, the interference to the adjacent region can be avoided, and the communication quality of the 5G NR can be improved.
Based on the content of the foregoing embodiments, after receiving the downlink service information and the control signaling sent by the base station through the first SSB beam, the method further includes: and sending target information to the base station through the second wave beam, so that the base station sends the target CSI-RS to the target terminal through the second SSB wave beam under the condition that the transmission direction of the second SSB wave beam is different from that of the first SSB wave beam.
Specifically, the position of the target terminal is changed, or an obstacle occurs between the target terminal and the base station, and the SSB beam detected by the target terminal changes. Under the condition that the SSB wave beam detected by the target terminal changes, whether the currently detected SSB wave beam meets the RSRP threshold value can be judged.
And in the case that only one SSB beam currently detected by the target terminal meets the RSRP threshold, taking the SSB beam as a second SSB beam.
Under the condition that SSB beams currently detected by a plurality of target terminals meet an RSRP threshold, the strongest SSB beam in the plurality of SSB beams can be used as an alternative SSB beam; alternatively, any one of the plurality of SSB beams may be used as the second SSB beam.
The target terminal may transmit the target information to the base station through the second SSB beam.
The base station receives target information sent by the target terminal through the second SSB beam, and can determine whether the transmission directions of the second SSB beam and the first SSB beam are the same.
And if the transmitting direction of the second SSB wave beam is different from that of the first SSB wave beam, the base station can send the target CSI-RS to the target terminal through the second SSB wave beam.
After receiving the target CSI-RS sent by the base station through the second SSB beam, the target terminal may obtain state information of the current channel based on the target CSI-RS, and may return the obtained state information of the current channel to the base station.
It should be noted that, if it is determined that the transmission direction of the second SSB beam is the same as that of the first SSB beam, the base station may still transmit the target CSI-RS to the target terminal through the first SSB beam.
And receiving downlink service information and control signaling sent by the base station through the second SSB wave beam.
Specifically, the base station may send downlink traffic information and control signaling to the target terminal through the second SSB beam.
The target terminal may receive the downlink traffic information and the control signaling sent by the base station through the second SSB beam.
In the embodiment of the invention, under the condition that the position of the target terminal is changed or an obstacle occurs between the target terminal and the base station, the SSB wave beam which is sent by the base station and does not carry the CSI-RS is detected again through the target terminal, the target information is sent to the base station through the second SSB wave beam, the base station sends the target CSI-RS to the target terminal through the second SSB wave beam under the condition that the transmitting direction of the second SSB wave beam is different from that of the first SSB wave beam, and the base station sends the downlink service information and the control signaling to the target terminal through the second SSB wave beam.
Fig. 7 is a schematic structural diagram of a base station provided in the present invention. The base station provided by the present invention is described below with reference to fig. 7, and the base station described below and the downlink beam management method described above may be referred to correspondingly. As shown in fig. 7, the base station includes: a request receiving module 701, a channel reporting module 702 and an information sending module 703.
A receiving request module 701, configured to receive an access request sent by a target terminal through a first SSB beam.
A channel reporting module 702, configured to allocate a target CSI-RS resource to a target terminal and send the target CSI-RS to the target terminal through a first SSB beam when the number of accessed terminals does not exceed a threshold.
An information sending module 703 is configured to send downlink service information and a control signaling to the target terminal through the first SSB beam.
Specifically, the receiving request module 701, the channel reporting module 702 and the information sending module 703 are electrically connected.
Optionally, the reception request module 701 may be further configured to receive target information sent by the target terminal through the second SSB beam.
Optionally, the channel reporting module 702 may be further configured to send the target CSI-RS to the target terminal through the second SSB beam under the condition that the transmission direction of the second SSB beam is different from that of the first SSB beam.
Optionally, the information sending module 703 may be further configured to send downlink service information and control signaling to the target terminal through the second SSB beam.
Optionally, the information sending module 703 may be specifically configured to send, to the target terminal, downlink service information and a control signaling carried by a physical downlink shared channel and a control signaling carried by a physical downlink control channel through the first SSB beam; wherein the base station does not configure tci-PresentInDCI field.
Optionally, the information sending module 703 may be specifically configured to send, to the target terminal, downlink service information and a control signaling carried by the physical downlink shared channel and a control signaling carried by the physical downlink control channel through the second SSB beam; wherein the base station does not configure tci-PresentInDCI field.
In the embodiment of the invention, the SSB wave beam sent by the base station does not carry the CSI-RS, the base station sends the target CSI-RS to the target terminal through the first SSB wave beam, and sends the downlink service information and the control signaling to the target terminal through the first SSB wave beam, so that when the downlink wave beam is managed, the occupied time-frequency resources are less, the interference to the adjacent region can be avoided, and the communication quality of the 5G NR can be improved.
Fig. 8 is a schematic structural diagram of a terminal provided by the present invention. The terminal provided by the present invention is described below with reference to fig. 8, and the terminal described below and the downlink beam management method described above may be referred to correspondingly. As shown in fig. 8, the terminal includes: a detection module 801, a reporting module 802 and a receiving module 803.
A detecting module 801, configured to send an access request to a base station through a first SSB beam, so that after the base station receives the access request, when the number of accessed terminals does not exceed a threshold, a target CSI-RS resource is allocated to a target terminal, and the target CSI-RS is sent to the target terminal through the first SSB beam.
A reporting module 802, configured to receive a target CSI-RS sent by a base station through a first SSB beam.
A receiving module 803, configured to receive downlink service information and control signaling sent by the base station through the first SSB beam.
Specifically, the detecting module 801, the reporting module 802 and the receiving module 803 are electrically connected.
Optionally, the detection module 801 may further be configured to send target information to the base station through the second SSB beam, so that the base station sends the target CSI-RS to the target terminal through the second SSB beam if the transmission direction of the second SSB beam is different from that of the first SSB beam.
Optionally, the reporting module 802 may be further configured to receive a target CSI-RS sent by the base station through the second SSB beam.
Optionally, the receiving module 803 may also be configured to receive downlink traffic information and control signaling that are sent by the base station through the second SSB beam.
In the embodiment of the invention, the SSB wave beam sent by the base station does not carry the CSI-RS, the base station sends the target CSI-RS to the target terminal through the first SSB wave beam, and sends the downlink service information and the control signaling to the target terminal through the first SSB wave beam, so that when the downlink wave beam is managed, the occupied time-frequency resources are less, the interference to the adjacent region can be avoided, and the communication quality of the 5G NR can be improved.
Fig. 9 illustrates a physical structure diagram of an electronic device, and as shown in fig. 9, the electronic device may include: a processor (processor)910, a communication Interface (Communications Interface)920, a memory (memory)930, and a communication bus 990, wherein the processor 910, the communication Interface 920, and the memory 930 communicate with each other via the communication bus 990. Processor 910 may invoke logic instructions in memory 930 to perform a method of downlink beam management comprising: a base station receives an access request sent by a target terminal through a first SSB wave beam; under the condition that the number of accessed terminals does not exceed a threshold value, allocating target CSI-RS resources for a target terminal, and sending the target CSI-RS to the target terminal through a first SSB wave beam; and sending downlink service information and control signaling to the target terminal through the first SSB wave beam. The terminal sends an access request to the base station through the first SSB wave beam, so that after the base station receives the access request, under the condition that the number of accessed terminals does not exceed a threshold value, a target CSI-RS resource is distributed to the target terminal, and the target CSI-RS is sent to the target terminal through the first SSB wave beam; receiving a target CSI-RS sent by a base station through a first SSB wave beam; and receiving downlink service information and control signaling which are sent by the base station through the first SSB wave beam.
Furthermore, the logic instructions in the memory 930 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product includes a computer program stored on a non-transitory computer readable storage medium, the computer program includes program instructions, when the program instructions are executed by a computer, the computer can execute the downlink beam management method provided by the above embodiments, the method includes: a base station receives an access request sent by a target terminal through a first SSB wave beam; under the condition that the number of accessed terminals does not exceed a threshold value, allocating target CSI-RS resources for a target terminal, and sending the target CSI-RS to the target terminal through a first SSB wave beam; and sending downlink service information and control signaling to the target terminal through the first SSB wave beam. The terminal sends an access request to the base station through the first SSB wave beam, so that after the base station receives the access request, under the condition that the number of the accessed terminals does not exceed a threshold value, a target CSI-RS resource is distributed to the target terminal, and the target CSI-RS is sent to the target terminal through the first SSB wave beam; receiving a target CSI-RS sent by a base station through a first SSB wave beam; and receiving downlink service information and control signaling which are sent by the base station through the first SSB wave beam.
In yet another aspect, the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to perform the downlink beam management method provided in the foregoing embodiments, the method including: a base station receives an access request sent by a target terminal through a first SSB wave beam; under the condition that the number of accessed terminals does not exceed a threshold value, allocating target CSI-RS resources for a target terminal, and sending the target CSI-RS to the target terminal through a first SSB wave beam; and sending downlink service information and control signaling to the target terminal through the first SSB wave beam. The terminal sends an access request to the base station through the first SSB wave beam, so that after the base station receives the access request, under the condition that the number of the accessed terminals does not exceed a threshold value, a target CSI-RS resource is distributed to the target terminal, and the target CSI-RS is sent to the target terminal through the first SSB wave beam; receiving a target CSI-RS sent by a base station through a first SSB wave beam; and receiving downlink service information and control signaling sent by the base station through the first SSB wave beam.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for downlink beam management, comprising:
receiving an access request sent by a target terminal through a first SSB wave beam;
under the condition that the number of accessed terminals does not exceed a threshold value, allocating target CSI-RS resources for the target terminal, and sending the target CSI-RS to the target terminal through the first SSB wave beam;
and sending downlink service information and control signaling to the target terminal through the first SSB wave beam.
2. The method of claim 1, wherein after the sending downlink traffic information and control signaling to the target terminal through the first SSB beam, the method further comprises:
receiving target information sent by the target terminal through a second SSB wave beam;
on a condition that the transmission direction of the second SSB beam is different from that of the first SSB beam, transmitting a target CSI-RS to the target terminal through the second SSB beam;
and sending downlink service information and control signaling to the target terminal through the second SSB wave beam.
3. The method of claim 1, wherein the sending downlink service information and control signaling to the target terminal through the first SSB beam specifically includes:
sending downlink service information and control signaling carried by a physical downlink shared channel and control signaling carried by a physical downlink control channel to the target terminal through the first SSB wave beam;
wherein the base station does not configure tci-PresentInDCI field.
4. The method according to claim 2, wherein the sending downlink service information and control signaling to the target terminal through the second SSB beam specifically includes:
sending downlink service information and control signaling carried by a physical downlink shared channel and control signaling carried by a physical downlink control channel to the target terminal through the second SSB wave beam;
wherein the base station does not configure tci-PresentInDCI field.
5. A method for downlink beam management, comprising:
sending an access request to a base station through a first SSB beam, so that after the base station receives the access request, under the condition that the number of accessed terminals does not exceed a threshold value, a target CSI-RS resource is allocated to a target terminal, and the target CSI-RS is sent to the target terminal through the first SSB beam;
receiving a target CSI-RS sent by the base station through the first SSB beam;
and receiving downlink service information and control signaling sent by the base station through the first SSB wave beam.
6. The downlink beam management method according to claim 5, wherein after receiving the downlink traffic information and the control signaling transmitted by the base station through the first SSB beam, the method further comprises:
transmitting target information to the base station through a second SSB beam, so that the base station transmits a target CSI-RS to the target terminal through the second SSB beam when the transmission direction of the second SSB beam is different from that of the first SSB beam;
receiving a target CSI-RS sent by the base station through the second SSB wave beam;
and receiving downlink service information and control signaling sent by the base station through the second SSB wave beam.
7. A base station, comprising:
the receiving request module is used for receiving an access request sent by a target terminal through a first SSB wave beam;
a channel reporting module, configured to allocate a target CSI-RS resource to the target terminal and send the target CSI-RS to the target terminal through the first SSB beam, when the number of terminals that have been accessed does not exceed a threshold value;
and the information sending module is used for sending downlink service information and control signaling to the target terminal through the first SSB wave beam.
8. A terminal, comprising:
a detection module, configured to send an access request to a base station through a first SSB beam, so that after the base station receives the access request, when the number of accessed terminals does not exceed a threshold, a target CSI-RS resource is allocated to a target terminal, and the target CSI-RS is sent to the target terminal through the first SSB beam;
a reporting module, configured to receive a target CSI-RS sent by the base station through the first SSB beam;
and the receiving module is used for receiving the downlink service information and the control signaling which are sent by the base station through the first SSB wave beam.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the downlink beam management method according to any one of claims 1 to 6.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, performs the steps of the downlink beam management method according to any one of claims 1 to 6.
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