CN110662255A - Method, base station and storage medium for channel state indication reference signal allocation - Google Patents
Method, base station and storage medium for channel state indication reference signal allocation Download PDFInfo
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Abstract
The embodiment of the invention discloses a CSI-RS (channel state information-reference signal) distribution method, a base station and a storage medium, belonging to the field of communication. Wherein, the method comprises the following steps: analyzing a frame structure, determining the working mode of each time slot of a new air interface NR, allocating CSI-RS transmission resources in the time slot with downlink symbols, and allocating CSI-RS feedback resources in the time slot with uplink symbols; initializing CSI-RS resources according to preset parameters; after receiving a feedback result of the measurement event, acquiring UE with poor channel quality; and allocating resources for each UE with poor channel quality according to the initialized CSI-RS resources. The embodiment of the invention allocates the CSI-RS with non-conflicted resources for each UE with poor accessed channel quality in the RRC reconfiguration process, thereby avoiding the conflict of resource feedback of a plurality of UEs at the same time, meeting the requirement of measuring the channel state of the UE in real time and ensuring that the side cost of the base station is as low as possible.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for allocating a CSI-RS (Channel State Information Reference Signal) in NR (New Radio, New air interface) mobile communications, a base station, and a storage medium thereof.
Background
Due to the popularization of the multi-antenna technology, CSI-RS is introduced in 4G, and the reference signal and the cell reference signal are used together to measure channel state information of a UE (User Equipment). As the protocol evolves, the CSI-RS replaces the cell reference signal entirely in the NR as the only reference signal for channel measurement, which can more accurately measure the channel quality to each UE. Because the frame structure configuration of NR is flexible, and there are various combination modes for uplink and downlink resources, an accurate method is needed to reasonably allocate the feedback resources of CSI-RS, to ensure that each UE position does not collide, and to implement the transmission and feedback of the resources.
Currently, the CSI-RS can be allocated to the UE only in two processes, the first process is allocated by a Radio Resource Control (RRC) layer when the UE initially accesses the base station; the second procedure is that the base station radio resource is allocated by the RRC layer at the time of the reconfiguration. Since the initial access cannot acquire the capability information of the UE, the UE can be allocated with the designated CSI-RS only through the RRC reconfiguration process. In order to satisfy the requirement that each UE can normally feed back channel state information under the condition that the channel quality of multiple UEs is poor and ensure that the side overhead of a base station is as low as possible, each UE with poor channel quality needs to be allocated with a CSI-RS (channel State reference signal-reference signal) with non-conflicted resources, so that the allocated CSI-RS are enabled to be in a state that the resources are not conflicted
The CSI-RS avoids resource feedback of a plurality of UEs at the same time from conflicting.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a CSI-RS allocation method, a base station, and a storage medium. The technical problem that each UE with poor accessed channel quality allocates the CSI-RS with non-conflicted resources is solved.
The technical scheme adopted by the embodiment of the invention for solving the technical problems is as follows:
according to an aspect of the present invention, a CSI-RS allocation method is provided, which includes:
analyzing a frame structure, determining the working mode of each time slot of a new air interface NR, allocating CSI-RS transmission resources in the time slot with downlink symbols, and allocating CSI-RS feedback resources in the time slot with uplink symbols;
initializing CSI-RS resources according to preset parameters;
after receiving a feedback result of the measurement event, acquiring UE with poor channel quality;
and allocating resources for each UE with poor channel quality according to the initialized CSI-RS resources.
According to another aspect of the present invention, a base station is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the CSI-RS allocation method described above.
According to still another aspect of the present invention, there is also provided a storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the steps of the CSI-RS allocation method described above.
The CSI-RS distribution method, the base station and the storage medium provided by the embodiment of the invention are based on a 5G protocol, and can avoid conflict of resource feedback of a plurality of UEs at the same time by distributing the CSI-RS with non-conflicted resources to each UE with poor channel quality, thereby meeting the requirement that each UE can normally feed back channel state information under the scene of poor channel quality, meeting the requirement of measuring the channel state of the UE in real time and ensuring that the side cost of the base station is as low as possible. The method not only enables the 5G beam management and channel measurement functions to obtain larger play space, but also can improve the switching speed in a switching scene, reduce the switching time delay and provide smoother experience and service for the UE. Meanwhile, the application of the CSI-RS can help the base station to evaluate the UE signals, better bandwidth resources are allocated to the UE, and user experience is improved.
Drawings
Fig. 1 is a flowchart of a CSI-RS allocation method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a next frame structure of an NR system according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for initializing CSI-RS according to an embodiment of the present invention.
Fig. 4 is a flowchart of a resource allocation method according to an embodiment of the present invention.
Fig. 5 is a flowchart of another CSI-RS allocation method according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The parameter meanings involved in the examples of the present invention are as follows:
specification of CSI-RS parameters
| Abbreviations for parameters | Chinese explanation |
| T1 | CSI-RS transmission period |
| T2 | CSI-RS feedback period |
| M | Number of symbols used to transmit CSI-RS within a transmission period |
| N | Number of symbols for feeding back CSI-RS in feedback period |
| B1 | Total bandwidth for transmitting CSI-RS |
| B2 | Total bandwidth for feedback CSI-RS |
| P1 | Number of frequency domain resources for transmitting CSI-RS |
| P2 | Number of frequency domain resources for feedback CSI-RS |
| ρ | Density of CSI-RS |
| Q | Number of frequency domain resources supported per resource block |
| R1 | Number of transmission resource sets |
| R2 | Feedback resource set number |
Example one
As shown in fig. 1, an embodiment of the present invention provides a CSI-RS allocation method, where the method includes:
s101, analyzing a frame structure, determining the working mode of each NR time slot, allocating CSI-RS transmission resources in the time slot with downlink symbols, and allocating CSI-RS feedback resources in the time slot with uplink symbols.
Specifically, the operation mode of each timeslot of the NR system may be full downlink (all symbols are used for downlink), full uplink (all symbols are used for uplink), downlink self-contained (multiple symbols are used for downlink and a small number of symbols are used for uplink), and uplink self-contained (multiple symbols are used for uplink and a small number of symbols are used for downlink) according to the frame structure configuration of the cell. The base station analyzes the structure, and allocates CSI-RS transmission resources in the time slot with the downlink symbols, and allocates feedback resources in the time slot with the uplink symbols.
Please refer to fig. 2, which illustrates a frame structure of the NR system, wherein the abscissa represents the time domain and the ordinate represents the frequency domain. One slot (e.g., slot x) has 14 symbols. By analyzing the frame structure, the transmission time t1 and the feedback time t2 of the CSI-RS are obtained. According to the preset transmission period T1 and the feedback period T2, the transmission time T1 and the feedback time T2 in the whole period can be determined.
And S102, initializing the CSI-RS resource according to preset parameters.
Specifically, because the total air interface resources of the NR cell are limited, the number of CSI-RS resources is not infinite, and the number of resources needs to be reasonably controlled according to an actual scene, the total CSI-RS transmission resource count of one cell is determined by a CSI-RS transmission period T1, a symbol number M used for transmitting CSI-RS in a transmission period T1, a total bandwidth B1 used for transmitting CSI-RS, and a density ρ of CSI-RS, and the total feedback resource count is determined by a CSI-RS feedback period T2, a symbol number N used for feeding back CSI-RS in a feedback period T2, and a total bandwidth B2 used for feeding back CSI-RS. In practical application, the parameters can be preset according to scenes, but the base station can also flexibly adjust the seven parameters to meet different scenes.
Referring to fig. 3, the present step further includes:
s1021, determining the number M of time domain symbols used for sending the CSI-RS in the transmission period T1 and the number N of time domain symbols used for feeding back the CSI-RS in the feedback period T2 according to the preset CSI-RS transmission period T1 and the CSI-RS feedback period T2.
S1022, determining the number of frequency domain resources P1 for transmitting the CSI-RS and the number of frequency domain resources P2 for feeding back the CSI-RS according to the preset total bandwidth B1 for transmitting the CSI-RS, the preset total bandwidth B2 for feeding back the CSI-RS and the preset bandwidth segment BWP.
And S1023, determining the number of resources supported by each resource block in the transmission resources according to the preset density rho of the CSI-RS.
And S103, after receiving the feedback result of the measurement event, acquiring the UE with poor channel quality.
Specifically, the base station firstly issues a measurement event and confirms the UE with poor channel quality according to a result fed back by the measurement event.
Specifically, when the signal quality of the UE is lower than a certain threshold, the UE reports the signal quality to the base station through a measurement event. And after receiving the measurement event, the base station acquires the UE with poor signal quality from the a2 measurement event. Since only the UE with poor signal quality reports, the base station can determine that the UE has poor signal quality after receiving the a2 measurement event of a certain UE.
And S104, allocating resources to each UE with poor channel quality according to the initialized CSI-RS resources.
Preferably, in order to better prevent signals between E from interfering, time domain resources may be preferentially allocated according to a feedback sequence of a measurement event to a UE with poor channel quality, and then feedback resources may be sequentially allocated to each UE with poor channel quality.
Referring to fig. 4, the present step further includes:
s1041, according to the preset transmission resource set number R1, allocating R1 sets of transmission resources for each UE with poor channel quality.
S1042, allocating R2 sets of feedback resources to each UE with poor access channel quality according to the preset number of feedback resource sets R2.
And S1043, associating the allocated transmission resource and feedback resource, and sending to the access UE through air interface reconfiguration.
Specifically, the CSI-RS plays an irreplaceable role in channel measurement, beam management and other functions. The base station may perform beam management based on the feedback of the UE for each set of resources. It is also possible to let the UE feed back different content based on R2 sets of different feedback purposes. Each set of feedback resources may correspond to 1 or more sets of transmission resources, but the purpose of each set of feedback resources must be unique. One or more sets of transmission resources may be used for measurements on different beams, which may assist the base station in selecting the best beam.
In the embodiment of the invention, a 5G protocol is used as a support, and the CSI-RS with non-conflicted resources is distributed to each UE with poor channel quality, so that the conflict of resource feedback of a plurality of UEs at the same time can be avoided, the requirement that each UE can normally feed back channel state information under the scene of poor channel quality by the plurality of UEs is met, the requirement of measuring the channel state of the UE in real time is met, and the side cost of a base station is ensured to be as low as possible.
Example two
As shown in fig. 5, a method for initializing CSI-RS resources provided in an embodiment of the present invention includes:
s501, analyzing a frame structure, determining a working mode of each time slot of a new air interface NR, and allocating CSI-RS transmission resources in the time slot with downlink symbols and allocating CSI-RS feedback resources in the time slot with uplink symbols.
And S502, initializing the CSI-RS resource according to the preset parameters.
And S503, after receiving the feedback result of the measurement event, acquiring the UE with poor channel quality.
S504, according to the initialized CSI-RS resources, resources are distributed to the UE with poor channel quality.
And S505, after the UE release is detected, recovering the feedback resource allocated to the UE.
In the embodiment of the present invention, on the basis of the first embodiment, when it is detected that the UE is released, the feedback resource allocated to the UE is recovered, and the base station may continue to allocate the resource to the UE with poor quality of a new access channel, thereby improving the utilization rate of the resource.
EXAMPLE III
The embodiment of the present invention is described by taking a typical scenario as an example: and in an office building scene, 400 UEs with poor channel quality are supported. The configuration parameters are as follows: the frame structure is 10ms in period, 1 downlink symbol is used for measuring the channel state of each frame, 5 uplink symbols are used for feeding back information, the cell bandwidth is 272RB, 20 resources are supported by the frequency domain to feed back CSI information at the same time, each CSI information occupies 2RB, and the number of feedback resource sets is 1 (only the channel quality is measured). The measurement period is configured to be 10ms, the feedback period is configured to be 40ms, and the allocation principle is that according to the feedback sequence of the UE measurement event to the poor channel quality, the time domain resource is allocated first, and then the frequency domain resource is allocated.
Typical scene parameter configuration table
| Parameter(s)Lists | Parameter configuration value |
| T1 | 10ms |
| T2 | 40ms |
| M | 1 |
| N | 20 |
| B1 | 272RB |
| B2 | 40RB |
According to the sequence of the feedback of the UE measurement events to the poor channel quality, the feedback time domain position of the ith UE with the poor channel quality is as follows: (slot0+ (i-1) × slot)% N, where slot0 represents a slot position allocated to the CSI-RS feedback resource, slot represents a total number of slots of each frame structure, and a feedback frequency domain position of the ith UE with poor channel quality is: (i × P2)% N + P0, where P0 denotes an initial position of the frequency domain resource position.
According to the above rule, specifically to the scenario of the present embodiment, that is:
the CSI-RS feedback time domain positions are as follows: the CSI for the 1 st UE is offset by 3 within the configured CSI period,
the CSI of the second UE is offset by 7 within the configured CSI period,
the CSI of the ith UE is shifted to 3+ (i-1) × 4 in the configured CSI period.
After 20 UEs are configured, the slot of the CSI sent by the subsequent UE is analogized,
and the time domain position of the jth UE needing to send the CSI-RS is consistent with that of the (j% 20) th UE.
The frequency domain positions are: the 1 st UE frequency domain continuously occupies 2RB, the second UE occupies the same frequency domain position, and the occupied frequency domain position is unchanged until the 20 th UE. And the frequency domain positions of the 20 th to 40 th UE needing to send the CSI-RS are 2 RBs which are continuous behind the first 20 UEs, and by analogy, each 20 UEs form one group, and each group occupies 2 RBs which are continuous behind the frequency domain of the previous group. After 400 UEs access, the time domain occupies 20 resources, and the frequency domain occupies 20 resources. The embodiment of the present invention takes a typical scenario as an example to intuitively explain the CSI-RS allocation method, and is not limited to this in practical application.
In addition, an embodiment of the present invention further provides a base station, where the base station includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the computer program is executed by the processor, the steps of the CSI-RS allocation method are implemented.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above CSI-RS allocation method are implemented.
It should be noted that the base station and the computer-readable storage medium belong to the same concept as the CSI-RS allocation method embodiment, and specific implementation processes thereof are detailed in the method embodiment, and technical features in the method embodiment are applicable to both the base station and the computer-readable storage medium, which are not described herein again.
The CSI-RS distribution method, the base station and the storage medium provided by the embodiment of the invention are based on a 5G protocol, and can avoid conflict of resource feedback of a plurality of UEs at the same time by distributing the CSI-RS with non-conflicted resources to each UE with poor channel quality, thereby meeting the requirement that each UE can normally feed back channel state information under the scene of poor channel quality, meeting the requirement of measuring the channel state of the UE in real time and ensuring that the side cost of the base station is as low as possible. The method not only enables the 5G beam management and channel measurement functions to obtain larger play space, but also can improve the switching speed in a switching scene, reduce the switching time delay and provide smoother experience and service for the UE. Meanwhile, the application of the CSI-RS can help the base station to evaluate the UE signals, better bandwidth resources are allocated to the UE, and user experience is improved.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.
In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present invention are intended to be within the scope of the claims.
Claims (9)
1. A method for allocating CSI-RS (channel State indication reference signals), which comprises the following steps:
analyzing a frame structure, determining the working mode of each time slot of a new air interface NR, allocating CSI-RS transmission resources in the time slot with downlink symbols, and allocating CSI-RS feedback resources in the time slot with uplink symbols;
initializing CSI-RS resources according to preset parameters;
after receiving a feedback result of the measurement event, acquiring UE with poor channel quality;
and allocating resources for each UE with poor channel quality according to the initialized CSI-RS resources.
2. The CSI-RS allocation method according to claim 1, wherein the preset parameters include: a CSI-RS transmission period T1, a CSI-RS feedback period T2, a bandwidth B1 for transmitting the CSI-RS, a bandwidth B2 for feeding back the CSI-RS, a density rho of the CSI-RS, a transmission resource set number R1 and a feedback resource set number R2.
3. The CSI-RS allocation method according to claim 2, comprising: the initializing the CSI-RS resource includes:
determining the number M of time-domain symbols used for sending the CSI-RS in the transmission period T1 and the number N of time-domain symbols used for feeding back the CSI-RS in the feedback period T2 according to the preset CSI-RS transmission period T1 and the CSI-RS feedback period T2;
determining the number P1 of frequency domain resources for transmitting the CSI-RS and the number P2 of frequency domain resources for feeding back the CSI-RS according to a preset total bandwidth B1 for transmitting the CSI-RS, a preset total bandwidth B2 for feeding back the CSI-RS and a preset bandwidth segment BWP;
and determining the number of resources supported by each resource block in the transmission resources according to the preset density rho of the CSI-RS.
4. The CSI-RS allocation method according to claim 2, wherein the allocating resources for each UE with poor accessed channel quality comprises:
allocating R1 sets of transmission resources for each UE with poor accessed channel quality according to the preset number of transmission resource sets R1;
allocating R2 sets of feedback resources to each UE with poor accessed channel quality according to the preset number of the sets of feedback resources R2;
and associating the allocated transmission resources and feedback resources, and sending to the access UE through air interface reconfiguration.
5. The CSI-RS allocation method according to claim 1, wherein said allocating resources to each UE with poor channel quality comprises in the following order:
according to the feedback sequence of the measurement events to the UE with poor channel quality, the time domain resources are firstly allocated, and then the frequency domain resources are allocated in sequence.
6. The CSI-RS allocation method according to claim 5, wherein the allocating time domain resources and the allocating frequency domain resources respectively comprise:
the feedback time domain position of the ith UE with poor channel quality is as follows: (slot0+ (i-1) × slot)% N, where slot0 denotes a slot position allocated to the CSI-RS feedback resource, slot denotes a total number of slots per frame structure, and N denotes a number of time domain symbols for feeding back the CSI-RS;
the feedback frequency domain position of the ith UE with poor channel quality is as follows: (i × P2)% N + P0, where P0 denotes an initial position of the frequency domain resource position, and P2 denotes the number of frequency domain resources P2 for feedback of CSI-RS.
7. The CSI-RS allocation method according to any of claims 1-6, characterized in that the method thereafter comprises: and when the UE release is detected, recovering the CSI-RS feedback resources of the UE.
8. A base station, characterized in that the device comprises a memory, a processor and a computer program stored on said memory and executable on said processor, said computer program, when executed by said processor, implementing the steps of the CSI-RS allocation method according to any of claims 1 to 8.
9. A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, carries out the steps of the CSI-RS allocation method according to any of claims 1 to 7.
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| PCT/CN2019/093118 WO2020001501A1 (en) | 2018-06-29 | 2019-06-26 | Channel state information reference signal allocation method, base station, and storage medium |
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| CN110662255B (en) | 2024-01-23 |
| WO2020001501A1 (en) | 2020-01-02 |
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