CN114390577B - Carrier aggregation-based main cell determination method, network equipment and communication system - Google Patents

Carrier aggregation-based main cell determination method, network equipment and communication system Download PDF

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CN114390577B
CN114390577B CN202210281568.XA CN202210281568A CN114390577B CN 114390577 B CN114390577 B CN 114390577B CN 202210281568 A CN202210281568 A CN 202210281568A CN 114390577 B CN114390577 B CN 114390577B
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lbt
cell
carrier
lbt detection
measurement report
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CN114390577A (en
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林力
宋怡昕
陈瑞欣
姚坤杰
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Guangzhou Shiju Network Technology Co Ltd
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Guangzhou Shiju Network Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA

Abstract

The invention discloses a main cell determining method based on carrier aggregation, network equipment and a communication system, wherein the method comprises the following steps: carrying out LBT detection on a carrier cell group where user equipment is located according to the preset configuration and recording an LBT detection result; receiving a measurement report uploaded by user equipment, wherein the measurement report comprises wireless measurement results of carrier cells in a carrier cell group; and when the switching judgment condition is met, determining a target main cell according to the measurement report and the LBT detection result. Compared with the prior art, the method comprehensively considers the channel quality and the LBT success rate of each carrier cell to determine the main cell, and the method increases the possibility that the carrier cell with higher LBT success rate is selected as the main cell, thereby avoiding the transmission blockage of key control information caused by the frequent LBT failure of the main cell in a communication system of an unlicensed spectrum multi-carrier system, and effectively improving the transmission efficiency and the reliability of the system.

Description

Carrier aggregation-based main cell determination method, network equipment and communication system
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method, a network device, and a communication system for determining a primary cell based on carrier aggregation.
Background
The 5G wireless NR system introduced in the 3GPP R15 standard is a communication technology used on licensed spectrum resources. The authorized spectrum is dedicated to the 5G system, and other communication services cannot be occupied. In addition to the licensed spectrum, there are a large number of unlicensed spectrum resources that can be shared for use by the parties. Compared with authorized spectrum resources, although gaps exist among seamless coverage, high spectrum efficiency, high peak rate and reliability, the unlicensed spectrum resources are beneficial supplements of the authorized spectrum and have great use value.
The 3GPP introduced access support for unlicensed spectrum in the R16 standard, called NR-unlicensed (NR-U). The NR-U supports two networking modes: licensed spectrum assisted access and unlicensed spectrum independent access. Since unlicensed spectrum is a frequency band shared by parties, some countries have regulated regulatory requirements for using such frequency bands. Generally, when using unlicensed spectrum for communication, a communication device needs to follow a "Listen Before Talk" rule (LBT), i.e., the communication device may perform signal transmission only when the result of channel listening is idle. In addition, the maximum communication time of the communication device on the unlicensed spectrum is also limited, so that resources are prevented from being occupied by one party for a long time. The above two mechanisms ensure friendly coexistence of the respective communication parties on the shared spectrum. The NR standard also designs a communication specification on the basis of the above two points.
After the Channel LBT of the unlicensed spectrum is successful (i.e. the detected result is Channel idle), the communication device may use the spectrum for signal transmission, where the behavior is called Channel Occupancy (CO) and the Occupancy duration is called Channel Occupancy Time (COT). Usually, the maximum bandwidth of a segment of unlicensed spectrum does not exceed 20MHz, and if multiple segments of unlicensed spectrum exist, the communication system may use its spectrum resources in a Carrier Aggregation (CA) manner. In the CA system, each segment of spectrum resource is defined as a Component Carrier (CC), each CC corresponds to a Cell of a wireless system, and multiple cells are grouped and managed together, which is called a Cell Group (CG). In a Cell group CG, one Cell may be defined as a Primary Cell (PCell) carrying centralized control information, and the other cells are defined as secondary cells. Since the primary cell PCell carries the transmission of the key control information, including Uplink Control Information (UCI) of each carrier cell, and HARQ-ACK codebook fed back by downlink transmission, etc., which are all fed back by the PCell resource in the CG, the selection of the primary cell PCell is relevant to the transmission efficiency and transmission reliability of the communication system.
Currently, in a cell group CG of a CA system, a primary cell PCell selection rule is that a carrier cell with the best channel quality serves as a primary cell PCell according to the channel quality of each cell. However, under the usage rule of the unlicensed spectrum, the problems of low transmission efficiency and poor system reliability still exist when the handover decision is made according to the existing primary cell determination method.
Disclosure of Invention
In view of this, it is necessary to provide a primary cell determining method based on carrier aggregation, a network device, and a communication system, so as to solve the technical problems of low transmission efficiency and poor system reliability of the primary cell determining method in the unlicensed spectrum multi-carrier system in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a method for determining a primary cell based on carrier aggregation, including the following steps:
carrying out LBT detection on a carrier cell group where user equipment is located according to the preset configuration and recording an LBT detection result;
receiving a measurement report uploaded by user equipment, wherein the measurement report comprises a wireless measurement result of each carrier cell in the carrier cell group;
and when the switching judgment condition is met, determining a target main cell according to the measurement report and the LBT detection result.
Optionally, each carrier cell of the carrier cell group is configured with an LBT sounding parameter, after each LBT sounding, the LBT sounding parameter corresponding to each carrier cell is calculated according to the LBT sounding result and a preset calculation method, and the recorded LBT sounding parameter is updated according to the calculation result, where the wireless measurement result includes a cell quality parameter used for characterizing channel quality of the carrier cell;
the step of determining a target primary cell according to the measurement report and the LBT sounding result comprises:
acquiring LBT detection parameters and cell quality parameters corresponding to each carrier cell;
and determining a target main cell according to the LBT detection parameters and the cell quality parameters corresponding to each carrier cell.
Optionally, the LBT detection parameter is an LBT success rate or an LBT failure rate, and the LBT detection parameter has an initial value;
the preset calculation method comprises the following steps:
when the number of the LBT detection results is smaller than a preset number, the LBT detection parameters keep the initial values;
and when the number of the LBT detection results is greater than or equal to the preset number, calculating the LBT success rate or the LBT failure rate according to the latest LBT detection results with the preset number.
Optionally, the LBT detection result is stored in a first-in first-out data queue with a fixed length, where the fixed length corresponds to a storage space required by the LBT detection results of the preset number;
correspondingly, when the number of the LBT detection results is greater than or equal to the preset number, the step of calculating the LBT success rate or the LBT failure rate according to the latest LBT detection results of the preset number specifically includes:
and when the number of the LBT detection results is larger than or equal to a preset number, calculating the LBT success rate or the LBT failure rate according to the LBT detection results stored in the first-in first-out data queue.
Optionally, the step of determining a target primary cell according to the LBT sounding parameter and the cell quality parameter corresponding to each carrier cell includes:
inputting the cell quality parameters and the LBT detection parameters into a switching index calculation formula, and calculating the switching indexes of all carrier cells in the carrier cell group in sequence;
and determining the carrier cell serving as the target main cell according to the calculated switching indexes of the carrier cells.
Optionally, the cell quality parameter includes at least one of reference signal received energy RSRP, reference signal received quality RSRQ, and signal to interference and noise ratio SINR; in the handover indicator calculation formula, the handover indicator is positively correlated with the cell quality parameter, and when the LBT sounding parameter is an LBT success rate, the handover indicator is positively correlated with the LBT sounding parameter, and when the LBT sounding parameter is an LBT failure rate, the handover indicator is negatively correlated with the LBT sounding parameter.
Optionally, the meeting of the handover decision condition includes:
receiving a measurement report uploaded by the user equipment; and/or
Performing the LBT probing once.
Optionally, when the measurement report uploaded by the ue is received and the handover decision condition is met, the step of determining the target primary cell according to the measurement report and the LBT detection result includes:
determining a target primary cell according to the LBT detection parameters stored at the current moment and the currently received measurement report;
when the LBT probing is performed once and the handover decision condition is satisfied, the step of determining a target primary cell according to a measurement report and an LBT probing result includes:
updating the LBT detection parameters according to the current LBT detection result;
and determining a target primary cell according to the updated LBT detection parameters and the measurement report stored at the current moment.
Another embodiment of the present invention provides a network device, which includes a memory and a processor, where the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to implement the steps of the primary cell determination method based on carrier aggregation as described above.
Another embodiment of the present invention provides a communication system including a user equipment and a network device as described above.
Compared with the prior art, the method for determining the primary cell based on the carrier aggregation provided by the embodiment of the invention has the advantages that the network equipment is configured to carry out LBT detection on the carrier cell group where the user equipment is located, and can receive the measurement report uploaded by the user equipment, so that when the switching judgment condition is met, the base station can determine the primary cell by comprehensively considering the channel quality and the LBT success rate of each carrier cell according to the LBT detection result and the measurement report corresponding to the carrier cell group, the method enables the possibility that the carrier cell with higher LBT success rate is selected as the primary cell to be increased, thereby avoiding the transmission blockage of key control information caused by frequent LBT failure of the primary cell in a communication system of an unlicensed spectrum multi-carrier system, and effectively improving the transmission efficiency and reliability of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of an embodiment of a primary cell determining method based on carrier aggregation according to the present invention.
Fig. 2 is a flowchart illustrating an embodiment of determining a target primary cell according to a measurement report and LBT sounding results.
Fig. 3 is a flowchart of a primary cell determining method based on carrier aggregation according to another embodiment of the present invention.
Fig. 4 is a block diagram of a network device according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating the principle of handover of a primary cell in a carrier cell group.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto. It is to be understood that the embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
The method for determining a primary cell based on carrier aggregation according to various embodiments of the present invention is used in a communication system adopting a 5G unlicensed spectrum multi-carrier system, where the communication system includes a network device and a user equipment UE, and the user equipment UE communicates with the network device through a carrier cell group CG. For the UE, the carrier cell set forming the CG and the primary cell PCell in the CG may change due to channel conditions and other factors, and may implement a change process of the primary cell through a handover process of wireless communication, and as shown in fig. 5, a handover process of changing the primary cell PCell in a cell group is shown, as shown in fig. 1, assuming that a carrier cell group includes 3 carrier cells, which are respectively denoted as a carrier cell a, a carrier cell B, and a carrier cell C, where the carrier cell a is the primary cell PCell before handover, and the carrier cell B and the carrier cell C are secondary cells scells, the primary cell may change after handover: and the carrier cell A and the carrier cell C are secondary cells SCell, and the carrier cell B is a primary cell PCell.
The applicant finds, through research, that in a communication system of a 5G unlicensed spectrum multi-carrier system, when a primary cell PCell is determined only according to channel quality in a handover decision process, transmission efficiency is low in a communication process between a user equipment UE and a base station gNB, and system reliability is poor mainly due to usage rules of an unlicensed spectrum, in the process of using the unlicensed spectrum, a situation that carrier resources cannot be used due to LBT failure may occur, and if a scenario of LBT failure frequently occurs on a carrier where the primary cell PCell is located, response information of downlink transmission cannot be smoothly fed back to a network, so that transmission blocking is caused, and transmission efficiency and reliability of the system are affected. Therefore, the applicant provides a new primary cell determining method, which takes the LBT detection result as a consideration index in the handover decision process in addition to the channel quality, and corrects the channel quality by using the LBT detection result, so that the possibility that the carrier with higher LBT success rate is selected as the primary cell PCell is increased, thereby facilitating the transmission of key control information, particularly HARQ-ACK information, and improving the transmission efficiency and reliability of the system. The present invention will be described in detail with reference to examples.
Example 1
Referring to fig. 1, fig. 1 is a flowchart illustrating a primary cell determining method based on carrier aggregation according to an embodiment of the present invention, where the method is described by taking a network device as an example. As shown in fig. 1, it comprises the following steps:
step S101, LBT detection is carried out on the carrier cell group where the user equipment is located according to the preset configuration, and an LBT detection result is recorded.
In this embodiment, LBT detection is initiated by the base station gNB side, and in order to determine the primary cell by comprehensively using the measurement report and the LBT detection result of each carrier cell, the base station gNB configures the LBT detection process in advance, including information such as the LBT detection period. For example, the base station gNB is configured in advance to perform LBT sounding periodically according to the time interval T.
And step S102, receiving a measurement report uploaded by the user equipment, wherein the measurement report comprises the wireless measurement result of each carrier cell in the carrier cell group.
Specifically, in the process of communicating with the UE, the gbb sends a radio measurement control command to the UE to instruct the UE to measure the channel quality of each carrier cell in the UE cell group, and reports a measurement result (i.e., a measurement report) after the measurement is finished, so that the gbb can make a handover decision.
Specifically, the measurement report includes the radio measurement result of each carrier cell in the carrier cell group. Each wireless measurement result includes a cell quality parameter for characterizing channel quality of a corresponding carrier cell, wherein the cell quality parameter may include at least one of reference signal received energy RSRP, reference signal received quality RSRQ, and signal to interference and noise ratio SINR. The higher the value of the cell quality parameter is, the better the channel quality of the corresponding carrier cell is. In some embodiments, three cell quality parameters, namely reference signal received energy RSRP, reference signal received quality RSRQ and signal to interference and noise ratio SINR, may be included in the measurement report, while the channel quality of the carrier cell is characterized by the three cell quality parameters.
The reporting mode of the measurement report mainly includes two types: a periodic trigger or an event trigger. In a periodic triggering mode, User Equipment (UE) reports a measurement report according to a certain time interval; in the event-triggered mode, the UE reports the measurement result only when a certain set condition (e.g. the measured signal strength exceeds or is lower than a certain threshold) is met. In the prior art, a measurement report generally adopts an event triggering manner, so that a base station gNB can receive the measurement report when a wireless measurement result of each carrier cell in a carrier cell group meets a set condition, and perform handover judgment, where the wireless measurement result included in the measurement report is a unique index for performing handover judgment. In this embodiment, in order to determine the primary cell by comprehensively using the measurement report of the carrier cell and the LBT detection result, the reporting mode of the measurement report is set as periodic trigger. Specifically, the base station gNB configures a radio measurement procedure of the user equipment UE by sending a radio measurement control command to the user equipment UE. In some embodiments, the radio measurement control instruction includes, but is not limited to, parameters such as a reporting mode of a measurement report and a radio measurement period, and the radio measurement period is the same as the LBT detection period, and is a time interval T. That is, in this embodiment, the base station gNB notifies the UE of adopting the periodic reporting mode instead of the event reporting mode through the radio measurement control instruction. In addition, the base station gNB may store the measurement report after receiving the measurement report uploaded by the user equipment UE, and since the user equipment UE may periodically report the measurement report, only needs to refer to the latest measurement report when making a handover decision, the base station gNB side only needs to store the latest measurement report, that is, if the base station gNB side already has a stored measurement report, when receiving a new measurement report, the base station gNB directly covers the existing measurement report with the latest measurement report without storing all the measurement reports.
And step S103, when the switching judgment condition is met, determining a target main cell according to the measurement report and the LBT detection result.
When the handover decision condition is satisfied, the base station gNB is triggered to perform handover decision, that is, the target primary cell is determined according to the measurement report and the LBT detection result, and whether the user equipment UE needs to handover the primary cell is determined according to the determined target primary cell. Specifically, if the determined target primary cell is different from the source primary cell of the user equipment UE, the user equipment is controlled to be switched to the target primary cell. After the target primary cell is determined, the user equipment is controlled to switch the primary cell to the prior art, and the specific implementation process of the method is not described in detail in the invention.
In some embodiments, satisfying the handover decision condition may include the following situations:
(1) receiving a measurement report uploaded by User Equipment (UE);
(2) the base station gNB performs one LBT detection;
(3) a base station gNB receives a measurement report uploaded by user equipment UE or executes one LBT detection;
(4) the base station gNB executes one LBT detection while receiving the measurement report uploaded by the user equipment UE;
that is, a handover decision can be triggered by the above four cases. Since the measurement report and the LBT detection result both affect the determination of the target primary cell in the handover decision process in this embodiment, it is better that the measurement report or the LBT detection result is considered to satisfy the handover decision condition when it may change, thereby triggering the handover decision. That is, when the base station gNB receives the measurement report uploaded by the UE or the base station gNB performs an LBT detection, it is determined that the handover decision condition is satisfied, and then the step of determining the target primary cell according to the measurement report and the LBT detection result is performed.
Compared with the prior art, the method for determining the main cell based on the carrier aggregation has the advantages that the network equipment is configured to carry out LBT detection on the carrier cell group where the user equipment is located, and can receive the measurement report uploaded by the user equipment, so that when the switching judgment condition is met, the network equipment can comprehensively consider the channel quality and the LBT success rate of each carrier cell according to the LBT detection result and the measurement report corresponding to the carrier cell group to determine the main cell.
Example 2
While the embodiment 1 discloses a technical solution for performing handover decision by using a measurement report and an LBT detection result simultaneously, the embodiment describes in detail a specific implementation process thereof.
And on the side of the base station gNB, the base station gNB configures an LBT detection parameter for each carrier cell of the carrier cell group, after each LBT detection, the base station gNB calculates the LBT detection parameter corresponding to each carrier cell according to the LBT detection result and a preset calculation method, and updates the LBT detection parameter before the LBT detection according to the calculation result, so that on the side of the base station gNB, each carrier cell in the carrier cell group records the latest LBT detection parameter, and the latest LBT detection parameter can be used for carrying out switching judgment when the switching judgment condition is met.
Specifically, if a certain carrier cell LBT succeeds, it indicates that the cell is unoccupied, and it can be used, whereas if a certain carrier cell LBT fails, it indicates that the carrier cell is occupied, and it cannot be used. In a carrier cell group, under the usage rule of an unlicensed spectrum, if a scenario of LBT failure frequently occurs on a carrier where a primary cell PCell is located, critical control information carried by the primary cell cannot be reliably transmitted. Therefore, the higher the LBT success rate of the primary cell is, the better the primary cell can reliably transmit the key control information, and thus, as the primary cell, the higher the LBT success rate can be kept. For this reason, in this embodiment, when the LBT sounding parameter is used for the handover decision, the LBT sounding parameter may be an LBT success rate or an LBT failure rate, where the LBT success rate may be recorded as an LBT success rate
Figure 606342DEST_PATH_IMAGE001
LBT failure rate can be recorded as
Figure 186097DEST_PATH_IMAGE002
。
In the practical application process, the base station gNB periodically performs LBT detection on the carrier cell group, and the LBT detection parameter calculated according to the detection result is related to the number of LBT detection samples. Taking LBT detection parameters as an example of LBT success rate, assuming that after a base station performs LBT detection once, an LBT detection result corresponding to a certain carrier cell is LBT success, since the total number of LBT detections at this time is 1, and the LBT detection result is LTB success, if the LBT success rate is directly calculated, the obtained LBT success rate is 1, if the LBT success rate is directly used for handover decision, a large error is easily generated for the handover decision, and the reason for the error is mainly that: when the number of samples (LBT detection results) is 1 or the number of samples is small, that is, the number of samples is insufficient, the reference value of the samples is very low, and if the LBT success rate is calculated immediately by directly using the sample data, a large fluctuation is generated, which cannot objectively represent the resource occupation situation of the corresponding carrier cell. In order to solve the problem, in the embodiment of the present invention, an initial value and a preset number are set for the LBT sounding parameters in advance, when the number of LBT sounding performed by the base station gNB is smaller than the preset number, the LBT sounding parameters are always kept at the initial value, and only when the number of LBT sounding performed by the base station gNB is greater than or equal to the preset number, the LBT sounding parameters are updated by using the LBT sounding results.
In order to implement mapping from the LBT detection result to the LBT detection parameter, in the embodiment of the present invention, a preset calculation method is configured on the side of the base station gNB, where the preset calculation method is used to represent a relationship between the LBT detection result and the LBT detection parameter. In one embodiment, the preset calculation method includes:
(1) when the number of the LBT detection results is less than the preset number, the LBT detection parameters maintain initial values. Taking the LBT probing parameter as the LBT success rate as an example, in an embodiment, the value of the initial value is 1, that is, the value is
Figure 37378DEST_PATH_IMAGE003
. Of course, in other embodiments, the value of the initial value is not limited to 1.
(2) And when the number of the LBT detection results is greater than or equal to the preset number, calculating the LBT success rate or the LBT failure rate according to the latest LBT detection results with the preset number. Taking the LBT detection parameter as the LBT success rate as an example, the setting makes the statistical sample of the LBT success rate include only the LBT detection result in the time window traced back by taking the current LBT detection as the starting point, where the length of the time window is the preset number of LBT detection cycles, that is, the time required for performing the LBT detection for the preset number of times. Thus, the LBT success rate is obtained according to the latest LBT detection result, and the current resource occupation condition of the corresponding carrier cell can be more expressed.
In specific implementation, the LBT probing result is stored by a first-in first-out data queue with a fixed length, that is, a storage space with a fixed length is configured in advance on the side of the base station gNB, where the fixed length corresponds to a storage space required by a preset number of LBT probing results. Assuming that the predetermined number is
Figure 936064DEST_PATH_IMAGE004
The length of the FIFO data queue is
Figure 256318DEST_PATH_IMAGE005
If the capacity of the FIFO data queue is full at a certain time, and the base station gNB performs LBT detection on the carrier cell group where the UE is located to generate a new LBT detection result, the LBT detection result which enters the data queue earliest is popped up, and the newly generated LBT detection result is stored in the data queue. Thus, when the number of LBT detection results is greater than or equal to the preset number, the step of calculating the LBT success rate or the LBT failure rate according to the latest LBT detection results of the preset number specifically includes: and calculating the LBT success rate or the LBT failure rate according to the LBT detection result stored in the first-in first-out data queue. Continuing to take the LBT probing parameter as the LBT success rate as an example, when the number of LBT probing results is greater than or equal to the preset number,
Figure 283DEST_PATH_IMAGE006
in which
Figure 971650DEST_PATH_IMAGE007
Representing first-in first-out numbersThe number of LBT probing results in the queue is the number of LBT successes.
Referring to fig. 2, based on the above settings, when the handover decision condition is satisfied, the step of the base station gNB determining the target primary cell according to the measurement report and the LBT detection result in step S103 includes:
step S1031, obtaining LBT detection parameters and cell quality parameters corresponding to each carrier cell.
Specifically, the cell quality parameter is obtained from a measurement report received and stored by the base station gNB.
Step S1032, the cell quality parameter and the LBT detection parameter are input into a switching index calculation formula, and the switching indexes of all carrier cells in the carrier cell group are calculated in sequence.
And step S1033, determining the carrier cell serving as the target main cell according to the calculated switching indexes of the carrier cells.
When the base station gNB performs handover decision, first, the LBT sounding parameters and the cell quality parameters corresponding to each carrier cell in the carrier cell group where the user equipment UE is located are obtained, and then, the target primary cell is determined according to the LBT sounding parameters and the cell quality parameters corresponding to each carrier cell, which is specifically implemented in step S1032 and step S1033. The handover indicator calculation formula is used for representing the relationship between the handover indicator and the LBT sounding parameter and the cell quality parameter, so that the level of the handover indicator can be used for representing the quality of each carrier cell.
In an embodiment, the handover indicator is positively correlated with the cell quality parameter, and when the LBT sounding parameter is the LBT success rate, the handover indicator is positively correlated with the LBT sounding parameter, and when the LBT sounding parameter is the LBT failure rate, the handover indicator is negatively correlated with the LBT sounding parameter, and at this time, the higher the value of the handover indicator is, the better the corresponding carrier cell is, and the handover indicator can be preferentially used as a primary cell. Taking the LBT probing parameter as the LBT success rate as an example, in some implementation manners, the handover indicator calculation formula may be:
Figure 152489DEST_PATH_IMAGE008
wherein the content of the first and second substances,
Figure 350252DEST_PATH_IMAGE009
which is indicative of a switch-over indicator,
Figure 756963DEST_PATH_IMAGE011
for representing cell quality parameters obtained from the measurement report, which may include one, two or three of reference signal received energy RSRP, reference signal received quality RSRQ, signal to interference and noise ratio SINR;
Figure 333569DEST_PATH_IMAGE012
indicating LBT success rate;
Figure 574057DEST_PATH_IMAGE014
the weighting factor is used for representing the influence weight of the LBT success rate on the handover index, and is a positive number, and the value can be preset. Similarly, if the LBT probing parameter is the LBT failure rate, the handover indicator calculation formula may be:
Figure 118171DEST_PATH_IMAGE015
certainly, in other embodiments, the handover indicator may also be negatively correlated with the cell quality parameter, and at the same time, positively correlated with the LBT failure rate or negatively correlated with the LBT success rate, where a higher value of the handover indicator indicates that the corresponding carrier cell is worse, and the handover indicator is not suitable for serving as the primary cell.
It should be noted that, in the embodiment of the present invention, the LBT detection parameters are obtained on the side of the base station gNB according to the LBT detection result, and other implementation manners may also be used as long as statistics of the LBT success rate or the LBT failure rate can be achieved. For example, corresponding LBT sounding variables are configured for each carrier cell of the carrier cell group, where the LBT sounding variables include at least two of LBT sounding number, LBT sounding failure number, and LBT sounding success number, and after the base station gNB has performed LBT sounding once, the LBT sounding variables corresponding to each carrier cell are updated according to LBT sounding results, so as to obtain updated LBT sounding parameters.
Example 3
Embodiment 1 describes that, when the base station gNB receives a measurement report uploaded by the user equipment UE or the base station gNB performs one LBT detection, it considers that the handover decision condition is satisfied, and performs the handover decision. The embodiment describes a specific implementation thereof in detail.
Specifically, when a measurement report uploaded by user equipment is received and a handover decision condition is met, a target primary cell is determined according to LBT detection parameters stored at the current moment and the currently received measurement report; when the LBT detection is executed once and the switching judgment condition is met, updating the LBT detection parameters according to the current LBT detection result; and determining a target primary cell according to the updated LBT detection parameters and the measurement report stored at the current moment. The process, when implemented, may include the steps of:
step S201, when the base station gNB receives the measurement report to trigger the handover decision, acquires the LBT detection parameters and acquires the cell quality parameters from the measurement report.
Step S202, a target primary cell is determined according to the LBT detection parameters and the cell quality parameters corresponding to each carrier cell. In this embodiment, when the handover decision is triggered by the measurement report, because the LBT sounding parameters corresponding to each carrier cell have an initial value, even if the base station gNB has not performed LBT sounding or the number of executed LBT sounding is too small at the current time, it does not affect the execution of the handover decision, the LBT sounding parameters may still be used to correct the cell quality parameters, and the target primary cell is determined by both the LBT sounding parameters and the LBT sounding parameters.
Step S203, when the base station gNB completes one LBT detection trigger handover decision, it searches whether a measurement report is stored on the base station gNB, if so, step S204 is executed, if not, the handover decision is not executed, and the procedure is ended.
When the LBT detection triggers the handover decision, it needs to search whether the base station gNB stores the measurement report, if there is no measurement report, the handover decision is ended, because the target primary cell cannot be determined only according to an index of the LBT detection result, if the target primary cell is determined only by using the index, the reliability is poor, and the channel quality of the target primary cell cannot be guaranteed, therefore, the embodiment of the present invention requires that the LBT detection result and the measurement report determine the target primary cell together, and the measurement report needs to be corrected by using the LBT detection result on the basis of the existence of the measurement report, but does not use the index of the LBT detection result alone.
Step S204, calculating and updating LBT probing parameters according to the current LBT probing result, obtaining cell quality parameters from the measurement report, and executing step S202.
Example 4
The embodiment provides a primary cell determining apparatus 100 based on carrier aggregation, which includes an LBT detecting module 10, a communication module 11, and a handover deciding module 12.
Specifically, the LBT probing module 10 is configured to perform LBT probing on a carrier cell group where the ue is located according to a pre-configuration and record an LBT probing result.
Optionally, in the LBT detection module 10, each carrier cell of the carrier cell group is configured with an LBT detection parameter, after each LBT detection, the LBT detection parameter corresponding to each carrier cell is calculated according to the LBT detection result and a preset calculation method, and the recorded LBT detection parameter is updated according to the calculation result. In some embodiments, the LBT probing parameter is an LBT success rate or an LBT failure rate, the LBT probing parameter having an initial value; the preset calculation method comprises the following steps: when the number of the LBT detection results is less than a preset number, the LBT detection parameters keep the initial values; and when the number of the LBT detection results is greater than or equal to the preset number, calculating the LBT success rate or the LBT failure rate according to the latest LBT detection results with the preset number.
In specific implementation, the LBT detection result is stored by a first-in first-out data queue of a fixed length, where the fixed length corresponds to a storage space required by the LBT detection results of the preset number; correspondingly, when the number of the LBT detection results is greater than or equal to the preset number, the step of calculating the LBT success rate or the LBT failure rate according to the latest LBT detection results of the preset number specifically includes: and when the number of the LBT detection results is greater than or equal to the preset number, calculating the LBT success rate or the LBT failure rate according to the LBT detection results stored in the first-in first-out data queue.
A communication module 11, configured to receive a measurement report uploaded by a user equipment, where the measurement report includes a wireless measurement result of each carrier cell in the carrier cell group.
Optionally, the radio measurement result includes a cell quality parameter for characterizing channel quality of a carrier cell. In some embodiments, the cell quality parameter comprises at least one of a reference signal received energy, RSRP, a reference signal received quality, RSRQ, and a signal to interference and noise ratio, SINR.
And a handover decision module 12, configured to determine a target primary cell according to the measurement report and the LBT detection result when a handover decision condition is met.
Correspondingly, the process of determining the target primary cell according to the measurement report and the LBT detection result in the handover decision module 12 includes: acquiring LBT detection parameters and cell quality parameters corresponding to each carrier cell; and determining a target primary cell according to the LBT detection parameters and the cell quality parameters corresponding to the carrier cells. In specific implementation, the cell quality parameter and the LBT probing parameter need to be input into a handover index calculation formula, handover indexes of carrier cells in the carrier cell group are sequentially calculated, and then a carrier cell serving as a target primary cell is determined according to the calculated handover indexes of the carrier cells. Wherein, in the handover indicator calculation formula, the handover indicator is positively correlated with the cell quality parameter, and when the LBT sounding parameter is an LBT success rate, the handover indicator is positively correlated with the LBT sounding parameter, and when the LBT sounding parameter is an LBT failure rate, the handover indicator is negatively correlated with the LBT sounding parameter.
Further, the satisfying of the handover decision condition includes: receiving a measurement report uploaded by the user equipment; and/or
Performing the LBT probing once.
When the measurement report uploaded by the ue is received and the handover decision condition is satisfied, the process of determining the target primary cell by the handover decision module 12 according to the measurement report and the LBT detection result includes: determining a target primary cell according to the LBT detection parameters stored at the current moment and the currently received measurement report; when the LBT probing is performed once and the handover decision condition is satisfied, the process of determining the target primary cell by the handover decision module 12 according to the measurement report and the LBT probing result includes: updating the LBT detection parameters according to the current LBT detection result; and determining a target primary cell according to the updated LBT detection parameters and the measurement report stored at the current moment.
Compared with the prior art, the carrier aggregation-based primary cell determining apparatus 100 of the embodiment of the present invention is configured to perform LBT detection on a carrier cell group in which a user equipment is located, and may receive a measurement report uploaded by the user equipment, so that when a handover decision condition is satisfied, the primary cell may be determined by comprehensively considering channel quality and LBT success rate of each carrier cell according to the LBT detection result and the measurement report corresponding to the carrier cell group
Example 5
The present embodiment provides a network device, which includes a memory and a processor, where the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to implement the steps of the method for determining a primary cell based on carrier aggregation according to any one of embodiments 1 to 3.
Example 6
This embodiment provides a communication system, which includes a user equipment and a network device shown in embodiment 5, and when communicating with the user equipment, the method for determining a primary cell based on carrier aggregation described in embodiments 1 to 3 of the present invention can be utilized.
Example 7
The present embodiment provides a computer-readable storage medium, having stored therein a plurality of instructions adapted to be loaded by a processor to perform the steps of the method for determining a primary cell based on carrier aggregation as recited in embodiments 1-3.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable 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 invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A method for determining a primary cell based on carrier aggregation is characterized by comprising the following steps:
carrying out LBT detection on a carrier cell group where user equipment is located according to the pre-configuration and recording an LBT detection result, wherein each carrier cell of the carrier cell group is configured with an LBT detection parameter, the LBT detection result is used for obtaining the LBT detection parameter through calculation, and the LBT detection parameter is an LBT success rate or an LBT failure rate;
receiving a measurement report uploaded by user equipment, wherein the measurement report comprises a wireless measurement result of each carrier cell in the carrier cell group, and the wireless measurement result comprises a cell quality parameter used for representing the channel quality of the carrier cell;
when a switching judgment condition is met, determining a target main cell according to the measurement report and an LBT detection result;
the step of determining the target primary cell according to the measurement report and the LBT detection result comprises:
inputting the cell quality parameters and the LBT detection parameters into a switching index calculation formula, and calculating the switching indexes of all carrier cells in the carrier cell group in sequence;
determining a carrier cell serving as a target primary cell according to the calculated handover indexes of the carrier cells, wherein in the handover index calculation formula, the handover indexes are positively correlated with the cell quality parameters, when the LBT detection parameters are LBT success rates, the handover indexes are positively correlated with the LBT detection parameters, and when the LBT detection parameters are LBT failure rates, the handover indexes are negatively correlated with the LBT detection parameters;
the reporting mode of the measurement report is periodic triggering, and the period of the wireless measurement for obtaining the measurement report is the same as the period of the LBT detection.
2. The method for determining a primary cell based on carrier aggregation according to claim 1, wherein after each LBT detection, LBT detection parameters corresponding to each carrier cell are calculated according to the LBT detection result and a preset calculation method, and the recorded LBT detection parameters are updated according to the calculation result;
correspondingly, the step of determining the target primary cell according to the measurement report and the LBT sounding result includes:
acquiring LBT detection parameters and cell quality parameters corresponding to each carrier cell;
and determining a target primary cell according to the LBT detection parameters and the cell quality parameters corresponding to the carrier cells.
3. The carrier aggregation based primary cell determination method of claim 2, wherein the LBT sounding parameters have initial values;
the preset calculation method comprises the following steps:
when the number of the LBT detection results is less than a preset number, the LBT detection parameters keep the initial values;
and when the number of the LBT detection results is greater than or equal to the preset number, calculating the LBT success rate or the LBT failure rate according to the latest LBT detection results with the preset number.
4. The carrier aggregation-based primary cell determination method according to claim 3, wherein the LBT sounding results are stored through a first-in-first-out data queue of a fixed length, the fixed length corresponding to a storage space required by the preset number of LBT sounding results;
correspondingly, when the number of the LBT detection results is greater than or equal to the preset number, the step of calculating the LBT success rate or the LBT failure rate according to the latest LBT detection results of the preset number specifically includes:
and when the number of the LBT detection results is greater than or equal to the preset number, calculating the LBT success rate or the LBT failure rate according to the LBT detection results stored in the first-in first-out data storage queue.
5. The carrier aggregation-based primary cell determination method of claim 1, wherein the cell quality parameter comprises at least one of reference signal received energy, RSRP, reference signal received quality, RSRQ, and signal to interference and noise ratio, SINR.
6. The method for determining a primary cell based on carrier aggregation according to claim 2, wherein the meeting of the handover decision condition comprises:
receiving a measurement report uploaded by the user equipment; and/or
Performing the LBT probing once.
7. The method of claim 6, wherein when the handover decision condition is satisfied by receiving a measurement report uploaded by the UE, the step of determining the target primary cell according to the measurement report and the LBT detection result comprises:
determining a target primary cell according to the LBT detection parameters stored at the current moment and the currently received measurement report;
when the LBT probing is performed once and the handover decision condition is satisfied, the step of determining a target primary cell according to a measurement report and an LBT probing result includes:
updating the LBT detection parameters according to the current LBT detection result;
and determining a target primary cell according to the updated LBT detection parameters and the measurement report stored at the current moment.
8. A network device comprising a memory and a processor, the memory having stored thereon a computer program that, when executed by the processor, causes the processor to carry out the steps of the method for carrier aggregation based primary cell determination according to any of claims 1 to 7.
9. A communication system comprising a user equipment and a network device according to claim 8.
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