CN115835325A

CN115835325A - Cell switching method, cell switching device, access network equipment, electronic equipment and storage medium

Info

Publication number: CN115835325A
Application number: CN202111095102.2A
Authority: CN
Inventors: 尹志宁; 姜春霞; 张元雨; 管文锦
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2023-03-21

Abstract

The embodiment of the application provides a cell switching method and device, access network equipment, electronic equipment and a storage medium, and relates to the technical field of communication. The method comprises the following steps: if the load of the pilot frequency cell is determined not to accord with a first preset condition, acquiring a signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching based on user throughput; if the source cell of the terminal is a higher-frequency cell, indicating the terminal to be started and carrying out different-frequency measurement according to the condition that the signal quality of the terminal in the source cell is lower than a signal quality threshold; and if the pilot frequency switching measurement report reported after the terminal performs pilot frequency measurement is determined to meet the preset switching condition, switching the terminal to the lower frequency cell. The method and the device can exert the high-capacity advantage of the high-frequency cell and the coverage protection advantage of the low-frequency cell, ensure the stability of user throughput under the condition of not influencing coverage, and further improve the system capacity.

Description

Cell switching method, cell switching device, access network equipment, electronic equipment and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a cell handover method, an apparatus, an access network device, an electronic device, and a storage medium.

Background

The existing network deployment is mainly a single-layer network structure, that is, only one frequency point exists in the same coverage area and the same system. Cell reselection and handover under a single-layer network are mainly performed based on coverage or load:

based on the switching of the coverage, the same-frequency measurement and the pilot frequency measurement of the high-priority frequency point are always started, the pilot frequency measurement of the low-priority frequency point is started when the A2 event is met, and the starting threshold is set based on the coverage. When the signal quality of the serving cell and/or the signal quality of the neighboring cell satisfy a certain event, such as an A3 event, the handover measurement report is triggered, and then the cell handover is triggered.

Load-based handover may trigger cell handover when the load of the source cell is heavy or the load of the source cell and the target cell is unbalanced.

For coverage-based handover, a user will access a lower frequency point when coverage is limited. For a cell, the number of users borne by the cell with a higher frequency point is more, the resource is limited, the advantage of large capacity cannot be exerted, the load of the cell with a lower frequency point is less, and the resource is wasted.

For the load-based handover, the user is handed over in the optimal cell only because of the heavy load, so that the number of times of handover is increased, and the handover failure rate is increased.

Thus, the prior art is only applicable to single layer webs, but not to multi-layer webs.

Disclosure of Invention

Embodiments of the present application provide a cell handover method, an apparatus, an access network device, an electronic device, and a storage medium, which overcome the above problems or at least partially solve the above problems.

In a first aspect, a cell handover method for a multi-layer network is provided, where the multi-layer network includes at least one higher frequency cell and at least one lower frequency cell, and the method includes:

if the load of the pilot frequency cell is determined not to accord with a first preset condition, acquiring a signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching based on user throughput;

if the source cell of the terminal is a higher-frequency cell, indicating the terminal to be started and carrying out different-frequency measurement according to the condition that the signal quality of the terminal in the source cell is lower than a signal quality threshold;

and if the pilot frequency switching value report reported after the terminal carries out pilot frequency measurement is determined to meet the preset switching condition, switching the terminal to a lower frequency cell.

In a possible implementation manner, the obtaining a signal quality threshold for the terminal to perform inter-frequency handover further includes:

if the source cell of the terminal is a lower frequency cell, switching the terminal to a higher frequency cell according to the condition that the signal quality of the higher frequency cell is higher than the signal quality threshold

In one possible implementation, if the source cell of the terminal is a lower frequency cell, the method further includes:

and instructing the terminal to perform pilot frequency measurement, and switching the terminal to a lower frequency cell if the pilot frequency switching measurement report reported after the terminal performs the pilot frequency measurement is determined to meet the preset switching condition.

In one possible implementation manner, the instructing the terminal to perform the inter-frequency measurement further includes:

and if the same-frequency switching measurement report reported by the terminal is received and the load of the different-frequency cell meets a second preset condition, switching the terminal to the same-frequency cell.

In a possible implementation manner, if a co-frequency handover measurement report reported by a terminal is received, the method further includes:

if the load of the pilot frequency cell does not accord with the second preset condition, judging whether the terminal starts pilot frequency measurement;

and if the terminal is determined to start the pilot frequency measurement, switching the terminal to the same-frequency cell.

In one possible implementation manner, the determining whether the terminal starts inter-frequency measurement further includes:

if the terminal is determined not to start the pilot frequency measurement, indicating the terminal to start the pilot frequency measurement;

if the pilot frequency switching measurement report reported by the terminal is received within the preset time, switching the terminal to the pilot frequency cell;

and if the pilot frequency switching measurement report reported by the terminal is not received within the preset time, switching the terminal to the same-frequency cell.

In a possible implementation manner, the acquiring a signal quality threshold for the terminal to perform inter-frequency handover includes:

and determining the signal quality threshold of the terminal for performing different-frequency switching by combining the bandwidth and the flow number of the terminal in the higher-frequency cell and the lower-frequency cell respectively on the basis of the principle that the user throughput before and after switching is unchanged.

In one possible implementation, the method further includes:

and if the load of the pilot frequency cell is determined to meet the first preset condition, acquiring a signal quality threshold for pilot frequency measurement or pilot frequency switching of the terminal based on coverage.

In a possible implementation manner, the first preset condition is that the load of the pilot frequency cell is greater than the load of the source cell, and a load difference between the pilot frequency cell and the source cell exceeds a first preset load threshold.

In a possible implementation manner, the second preset condition is that the load of the different-frequency cell is greater than the load of the same-frequency cell, and the load difference between the same-frequency cell and the different-frequency cell exceeds a second preset load threshold.

In a second aspect, there is provided a cell switching apparatus for a multi-layer network, the multi-layer network including at least one higher frequency cell and at least one lower frequency cell, the apparatus comprising:

a first signal threshold determining module, configured to, if it is determined that the load of the pilot cell does not meet a first preset condition, obtain, based on user throughput, a signal quality threshold for the terminal to perform pilot frequency measurement or pilot frequency handover;

the pilot frequency measurement starting module is used for indicating the terminal to start and carry out pilot frequency measurement according to the condition that the signal quality of the terminal in the source cell is lower than a signal quality threshold if the source cell of the terminal is a higher-frequency cell;

and the first switching module is used for switching the terminal to the lower frequency cell if the pilot frequency switching measurement report reported after the pilot frequency measurement of the terminal is determined to meet the preset switching condition.

In one possible implementation manner, the cell switching apparatus further includes:

a second switching module, configured to switch the terminal to the higher frequency cell according to the fact that the signal quality of the higher frequency cell is higher than the signal quality threshold if the source cell of the terminal is the lower frequency cell

and the third switching module is used for indicating the terminal to perform pilot frequency measurement if the source cell of the terminal is a lower frequency cell, and switching the terminal to the lower frequency cell if the pilot frequency switching measurement report reported after the pilot frequency measurement performed by the terminal is determined to meet the preset switching condition.

and the fourth switching module is used for switching the terminal to the co-frequency cell if the co-frequency switching measurement report reported by the terminal is received and the load of the inter-frequency cell meets a second preset condition.

a fifth switching module, configured to determine whether the terminal starts inter-frequency measurement if the load of the inter-frequency cell does not meet the second preset condition; and if the terminal is determined to start the pilot frequency measurement, switching the terminal to the same-frequency cell.

the pilot frequency measurement indicating module is used for indicating the terminal to start pilot frequency measurement if the terminal is determined not to start the pilot frequency measurement;

a sixth switching module, configured to switch the terminal to the inter-frequency cell if the inter-frequency switching measurement report reported by the terminal is received within a preset time; and if the pilot frequency switching measurement report reported by the terminal is not received within the preset time, switching the terminal to the same-frequency cell.

In one possible implementation manner, the first signal threshold determining module is specifically configured to:

and determining the signal quality threshold of the terminal for carrying out pilot frequency measurement or pilot frequency switching by combining the bandwidth and the flow number of the terminal in the higher frequency cell and the lower frequency cell respectively on the basis of the principle that the user throughput before and after switching is unchanged.

and the second signal threshold determining module is used for obtaining a signal quality threshold of the pilot frequency measurement or pilot frequency switching based on the coverage if the load of the pilot frequency cell is determined to meet the first preset condition.

In a third aspect, an embodiment of the present application provides an access network device, including a memory, a transceiver, a processor:

a memory for storing a computer program; a transceiver for transceiving data under the control of the processor; a processor for reading the computer program in the memory and performing the steps of the method as provided by the first aspect.

In a fourth aspect, an embodiment of the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the method provided in the first aspect are implemented.

In a fifth aspect, embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the method as provided in the first aspect.

In a sixth aspect, embodiments of the present application provide a computer program, where the computer program includes computer instructions stored in a computer-readable storage medium, and when the computer instructions are read from the computer-readable storage medium by a processor of a computer device, the processor executes the computer instructions to make the computer device execute steps implementing the method as provided in the first aspect.

According to the cell switching method and device, the access network device, the electronic device and the storage medium, the load of the pilot frequency cell is determined not to meet the first preset condition, the signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching is obtained based on the user throughput, and when the source cell of the terminal is a higher frequency cell, the signal quality of the source cell of the terminal is lower than the signal quality threshold, the terminal is instructed to start pilot frequency measurement; if the pilot frequency switching measurement report reported after the pilot frequency measurement is started by the terminal is determined to meet the preset switching condition, the terminal is switched to the lower-frequency cell, so that the user can obtain the same user throughput after the pilot frequency switching is carried out, the high-capacity advantage of the high-frequency cell can be exerted, the coverage protection advantage of the low-frequency cell can be exerted, the stability of the user throughput is ensured under the condition that the coverage is not influenced, and the system capacity is further improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below.

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a flowchart illustrating a cell handover method of a multi-layer network according to an embodiment of the present application;

fig. 3 is a flowchart illustrating a cell handover method according to another embodiment of the present application;

fig. 4 is a flowchart illustrating a cell handover method according to still another embodiment of the present application;

fig. 5 is a schematic structural diagram of a cell switching apparatus of a multi-layer network according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an access network device according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a user distribution of a multi-layer network of an embodiment of the present application;

fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Several terms referred to in this application will first be introduced and explained:

(1) Multilayer net: the method is characterized in that a plurality of frequency points which are higher and lower are used for networking in the same mobile communication system and the same coverage area. Cells at higher frequency points typically have greater bandwidth and are therefore available to meet capacity requirements, where capacity refers to the throughput of users and cells. And the cell radius of the lower frequency point is larger, so that the coverage requirement can be met. Different frequency points are used for different purposes to form a multi-layer network under the common coverage.

(2) A cell, also called a cell, refers to an area covered by one or a part of a base station (sector antenna) in a cellular mobile communication system, in which a mobile station can reliably communicate with the base station via a radio channel.

(3) Handover is a process in which a terminal is handed over from one cell to a neighboring cell in an RRC connected state, and this process is called "handover". Handover over of a mobile communication system means that a terminal completes the transition of a radio link connection from a source cell to a target cell under the control of a radio access network, and is a basic technical means for ensuring seamless mobile communication service, and an ongoing call is exchanged between radio channels of different cells without interrupting the call.

When the terminal is in a service connection state and keeps service, the terminal moves from one cell to another cell, the original service cell cannot provide service for the terminal, and in order to not interrupt the service, the wireless bearing system searches the most suitable cell or network to provide continuous service for the terminal, so that the mobility management of seamless coverage of a wireless network is realized, namely cell switching.

(4) And performing same-frequency switching, wherein the target cell and the current serving cell use the same radio frequency carrier frequency. After the RRC connection between the terminal and the base station is established, the base station will immediately notify the terminal to perform the intra-frequency neighbor cell measurement (including the measurement of the cell reference signal of the current serving cell, of course) through the RRC reconfiguration message.

(5) Pilot frequency switching: the target cell and the current serving cell use different radio frequency carrier frequencies. Handover between different frequencies or systems is the most complex and broadly classified into two main categories:

1) Blind cutting: the base station is required to tell the terminal which target neighbor to switch to.

2) Based on pilot frequency measurement reports: the base station is required to tell the terminal which inter-frequency target cell to measure.

(6) Inter-frequency handover classification

The inter-frequency handover classification includes A1 to A5, B1 and B2, and 7 events in total, specifically:

an A1 event, the serving cell signal quality is higher than the corresponding threshold, the eNodeB stops inter-frequency/inter-system measurements, but in a frequency priority based handover, the A1 event is used to start inter-frequency measurements.

An A2 event, the serving cell signal quality is below the corresponding threshold, the eNodeB starts the pilot/inter-system measurement, but in the handover based on frequency priority, the A2 event is used to start the pilot measurement.

A3 event, the signal quality of the adjacent cell is better than that of the server cell, and the source eNodeB starts the same frequency/different frequency switching request

A4, in case of an event, the quality of the signal of the adjacent cell is higher than the corresponding threshold, the source eNodeB starts a pilot frequency switching request;

a5, in an event, the signal quality of a serving cell is lower than a threshold 1, and the signal quality of an adjacent cell is higher than a threshold 2, and a source eNodeB starts a pilot frequency switching request;

b1, in case of an event, the quality of the signal of the adjacent cell of the different system is higher than a corresponding threshold, the source eNodeB starts a different frequency switching request;

and B2, in the event that the signal quality of the serving cell is lower than the threshold 1 and the signal quality of the adjacent cell of the different system is higher than the threshold 2, the source eNodeB starts a different frequency handover request.

(7) The integrated Unit (CU) mainly includes a non-real-time wireless higher-layer protocol stack function, and also supports partial core network function convergence and edge application service deployment.

(8) Distributed Unit (DU), layer 2 functions that mainly handle physical layer functions and real-time requirements. In consideration of saving transmission resources between the remote radio unit and the DU, part of the physical layer functions may also be moved to the remote radio unit for implementation.

The present application provides a cell handover method, an apparatus, an electronic device, and a computer-readable storage medium for a multi-layer network, which are intended to solve the above technical problems in the prior art.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic architecture diagram of a communication system of an embodiment of the present application.

The base station provided in the embodiment of the present application may be a base station (Node B, NB) in a Universal Mobile Telecommunications System (UMTS), an evolved Node B (eNodeB, eNB) in a Long Term Evolution (LTE) or a base station or a controller in a fifth-generation Mobile communications System.

The user equipment (also called terminal) referred to in the embodiments of the present application may be a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem, etc. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be called a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile phone (or called a "cellular" phone) and a computer having a mobile terminal device, for example, a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN), and may exchange languages and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an access point (access point), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), and a user device (user device), which is not limited in this embodiment.

In addition, the technical scheme provided by the embodiment of the application can be suitable for various systems, especially 5G systems. For example, suitable systems may be global system for mobile communications (GSM) systems, code Division Multiple Access (CDMA) systems, wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) systems, long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, long term evolution (long term evolution) systems, LTE-a systems, universal mobile systems (universal mobile telecommunications systems, UMTS), universal internet Access (world interoperability for microwave Access (WiMAX) systems, new Radio interface (NR) systems, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5 GS), and the like.

The embodiment of the application provides a cell switching method of a multi-layer network, which can avoid cell reselection and switching triggered by load imbalance and can ensure that a user obtains the maximum throughput.

The multi-layer network of the embodiment of the present application includes at least one higher frequency cell and at least one lower frequency cell, and it can be understood that the frequency of the higher frequency cell is higher than that of the lower frequency cell. Taking 2.6GHz and 700MHz frequencies conventionally used by an operator as an example, the frequency of a higher frequency cell is 2.6GHz, the frequency of a lower frequency cell is 700MHz, wherein the 2.6GHz cell (i.e., the higher frequency cell) is in a TDD mode, and the ratio of uplink subframes to downlink subframes is 7.4:2.3, the uplink and the downlink share a large bandwidth of 100MHz to serve as a capacity layer; the 700MHz cell (i.e. the lower frequency cell) is in FDD mode, and the uplink and downlink are each 30MHz bandwidth as the overlay.

Since the 700MHz cell coverage is 3 times that of the 2.6GHz cell, both are given 1:3, namely the multilayer network comprises one 2.6GHz cell and three 700MHz cells. It should be noted that the deployment ratios and frequencies of the higher frequency cells and the lower frequency cells are merely examples, and the deployment ratios and frequencies of the higher frequency cells and the lower frequency cells are not specifically limited in the embodiments of the present application.

Since the multi-layer network involves information interaction among multiple cells, it is more advantageous to consider a CU-DU separation architecture with centralized management. Obtaining the load conditions of multiple cells requires a certain transmission delay, and has a large impact on the handover performance, so the execution subject of the embodiment of the present application may be a CU, and the CU is further considered to obtain the load conditions of other cells in advance and perform periodic update.

Referring to fig. 2, a schematic flow chart of a cell handover method of a multi-layer network according to an embodiment of the present application is exemplarily shown, where the schematic flow chart includes:

s101, if the load of the pilot frequency cell is determined not to accord with a first preset condition, a signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching is obtained based on user throughput.

In the embodiment of the present application, the cell with a higher frequency point generally has a larger bandwidth, and therefore can be used to meet the capacity requirement, and the cell with a lower frequency point has a larger radius, and can be used to meet the coverage requirement. The embodiment of the application can set the higher priority for the 2.6GHz in advance and the lower frequency priority for the 700MHz, so that the user is guaranteed to preferentially access the 2.6GHz cell and enjoy the advantage of high capacity.

In step S101, in the embodiment of the present application, it is first determined whether a load of a pilot frequency cell meets a first preset condition, where the pilot frequency cell is a cell having a frequency different from that of a source cell, and if the source cell of a terminal is a 2.6GHz cell, the pilot frequency cell is a 700MHz cell, and if the source cell of the terminal is a 700MHz cell, the pilot frequency cell is a 2.6GHz cell.

The first preset condition is that the load of the pilot frequency cell is greater than the load of the source cell and the load difference between the pilot frequency cell and the source cell exceeds a first preset load threshold. The size of the first preset load threshold is not specifically limited in the embodiment of the present application.

If the load of the pilot frequency cell meets the first preset condition, the source cell of the embodiment of the application uses the initial pilot frequency measurement threshold and the pilot frequency switching threshold to guide the terminal to perform coverage-based switching, and the initial pilot frequency measurement threshold of the higher frequency cell and the initial audio frequency switching threshold of the lower frequency cell of the embodiment of the application are both set based on coverage.

If the load of the pilot frequency cell does not accord with the first preset condition, the signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching is obtained based on the user throughput. It should be understood that, considering that the load of the inter-frequency cell does not meet the first preset condition, the terminal has not entered the weak coverage area of the higher frequency cell, but if the handover to the lower frequency cell can obtain higher user throughput, the terminal may perform handover based on the throughput. Because the frequency point priority of the lower frequency cell is lower, the opening threshold of pilot frequency measurement needs to be set. That is, when the source cell is a higher frequency cell, the signal quality threshold for the terminal to perform pilot frequency measurement is determined based on the user throughput, and when the source cell is a lower frequency cell, the signal quality threshold for the terminal to perform pilot frequency switching is determined based on the user throughput.

Specifically, in the embodiment of the present application, a signal quality threshold for performing inter-frequency handover by a terminal is determined by combining bandwidths and stream numbers of the terminal in a higher-frequency cell and a lower-frequency cell, respectively, on the basis of a principle that user throughput before and after handover is not changed.

The terminal capability to maximum number of flows is limited to: 2.6GHz terminal 2T4R,700MHz terminal 1T2R, the actual number of streams is determined according to the signal quality. Therefore, the signal quality threshold of the terminal in the 2.6GHz cell can be obtained by using the following formula, so that the terminal can obtain the same user throughput no matter the terminal is accessed into the 2.6GHz cell or the 700MHz cell:

bandwidth of terminal on 2.6GHz cell and flow number of user on 2.6GHz cell log ₂ (1 + SINR) = bandwidth of terminal on 700MHz cell [ { stream number of terminal in 700MHz cell } + ₂ (1+SINR+D)。

The SINR represents a signal quality threshold, D represents a preset signal quality increment, which belongs to a known quantity, and bandwidths and stream numbers of the terminal in a higher frequency cell (2.6 GHz cell) and a lower frequency cell (700 MHz cell) can be obtained in advance by the CU and also belong to a known quantity, so that the information quality threshold can be obtained by the above formula.

And S102, if the source cell of the terminal is a higher-frequency cell, indicating the terminal to be started and carrying out pilot frequency measurement according to the condition that the signal quality of the terminal in the source cell is lower than a signal quality threshold.

S103, if the pilot frequency switching measurement report reported after the pilot frequency measurement of the terminal is determined to meet the preset switching condition, switching the terminal to a lower frequency cell.

When the signal quality of a source cell of the terminal is lower than a signal quality threshold, the terminal is instructed to start pilot frequency measurement, a same-frequency switching measurement report may be reported after the terminal starts pilot frequency measurement, and a pilot frequency measurement report may also be reported, and when the pilot frequency switching measurement report reported by the terminal is received and meets a preset condition, for example, an A3 event occurs, the terminal is switched to a lower-frequency cell.

In the cell switching method of the multi-layer network, a signal quality threshold of a terminal for performing pilot frequency measurement or pilot frequency switching is obtained based on user throughput by determining that a load of a pilot frequency cell does not conform to a first preset condition, and when a source cell of the terminal is a higher frequency cell, the signal quality of the source cell of the terminal is lower than the signal quality threshold, and the terminal is instructed to start the pilot frequency measurement; if the pilot frequency switching measurement report reported after the pilot frequency measurement is started by the terminal is determined to meet the preset switching condition, the terminal is switched to the lower-frequency cell, so that the user can obtain the same user throughput after the pilot frequency switching is carried out, the high-capacity advantage of the high-frequency cell can be exerted, the coverage protection advantage of the low-frequency cell can be exerted, the stability of the user throughput is ensured under the condition that the coverage is not influenced, and the system capacity is further improved.

On the basis of the foregoing embodiments, as an optional embodiment, the obtaining a signal quality threshold for performing inter-frequency handover by a terminal further includes:

and if the source cell of the terminal is a lower frequency cell, switching the terminal to a higher frequency cell according to the condition that the signal quality of the higher frequency cell is higher than the signal quality threshold.

It should be noted that, in order to exert the advantage of large capacity of the higher frequency cell, in the embodiments of the present application, as long as the signal quality of the higher frequency cell meets the requirement, that is, is higher than the signal quality threshold, the terminal is switched to the higher frequency cell no matter what the signal quality of the lower frequency cell is the source cell.

On the basis of the foregoing embodiments, as an optional embodiment, for a terminal whose source cell is a lower frequency cell, the inter-frequency measurement is always on, so if the source cell of the terminal is the lower frequency cell, the method further includes: and further, if the pilot frequency switching measurement report reported after the pilot frequency measurement of the terminal is determined to accord with the preset switching condition, switching the terminal to a lower frequency cell.

Referring to fig. 3, a schematic flow chart of a cell handover method according to another embodiment of the present application is exemplarily shown, and as shown in the drawing, the method includes:

s201, judging whether the load of the pilot frequency cell meets a first preset condition, if so, executing a step S202; if not, executing step S203;

s202, based on the coverage to obtain the signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching, executing the step S204;

s203, acquiring a signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching based on user throughput;

s204, judging whether a source cell of the terminal is a higher frequency cell, if so, executing a step S205, and if not, executing a step S207;

s205, according to the condition that the signal quality of the terminal in the source cell is lower than a signal quality threshold, indicating the terminal to start pilot frequency measurement;

s206, if the pilot frequency switching measurement report reported after the pilot frequency measurement is started by the terminal is determined to meet the preset switching condition, switching the terminal to a lower frequency cell, and ending the switching process in the current round;

and S207, switching the terminal to the higher-frequency cell according to the condition that the signal quality of the higher-frequency cell is higher than the signal quality threshold, or switching the terminal to the lower-frequency cell if the pilot frequency switching measurement report reported after the pilot frequency measurement of the terminal is determined to meet the preset switching condition, and ending the switching process.

On the basis of the foregoing embodiments, as an optional embodiment, after instructing the terminal to perform inter-frequency measurement, the method further includes:

and if the same-frequency switching measurement report reported by the terminal is received and the load of the pilot frequency cell with the pilot frequency of the source cell meets a second preset condition, switching the terminal to the same-frequency cell with the source cell.

It should be understood that, this embodiment is applicable to both a higher frequency cell and a lower frequency cell as a source cell, and after a CU instructs a terminal to start inter-frequency measurement, the CU may receive an inter-frequency handover measurement report and may also receive an intra-frequency handover measurement report.

The second preset condition in the embodiment of the present application is that the load of the different-frequency cell is greater than the load of the same-frequency cell, and the load difference between the same-frequency cell and the different-frequency cell exceeds the second preset load threshold, because the possibility of occurrence of the second preset condition is obviously lower than the possibility of non-occurrence, the embodiment of the present application actually encourages the user who performs the same-frequency handover to preferentially perform the different-frequency handover.

The second preset load threshold in the embodiment of the present application may be equal to or different from the first preset load threshold, and the specific values of the two preset load thresholds are not specifically limited in the present application.

On the basis of the foregoing embodiments, as an optional embodiment, if an intra-frequency handover measurement report reported by a terminal is received, the method further includes:

It should be noted that if the CU determines that the inter-frequency measurement is started by the terminal, the CU still receives the intra-frequency handover measurement report (the inter-frequency handover measurement report is not received) of the terminal, which indicates that the inter-frequency cell does not satisfy the handover condition, and performs intra-frequency handover on the terminal.

On the basis of the foregoing embodiments, as an optional embodiment, determining whether the terminal starts inter-frequency measurement, and then further including:

According to the embodiment of the application, the timer is set after the pilot frequency measurement is started by the indication terminal, before the timer is overtime, if a pilot frequency switching measurement report is received, pilot frequency switching is carried out, if the pilot frequency switching measurement report is not received, the CU immediately sends a switching request to a same-frequency target cell, and same-frequency switching is carried out.

Referring to fig. 4, a schematic flow chart of a cell handover method according to another embodiment of the present application is exemplarily shown, and as shown in the drawing, the method includes:

s301, judging whether the load of the pilot frequency cell meets a first preset condition, and if so, executing a step S302; if not, go to step S303;

s302, based on the coverage to obtain the signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching, executing the step S304;

s303, acquiring a signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching based on the user throughput;

s304, judging whether a source cell of the terminal is a higher frequency cell; if yes, go to step S305; if not, executing step S306;

s305, indicating the terminal to start pilot frequency measurement according to the condition that the signal quality of the terminal in the source cell is lower than a signal quality threshold;

s306, judging whether a pilot frequency measurement report or a same frequency measurement report is received; if the pilot frequency measurement report is received, executing step S307, and if the common frequency measurement report is received, executing step S308;

s307, if the pilot frequency switching measurement report is determined to meet the preset switching condition, switching the terminal to the pilot frequency cell, and ending the cell switching process;

s308, judging whether the load of the pilot frequency cell meets a second preset condition, if so, executing a step S309, and if not, executing a step S310;

s309, switching the terminal to the same-frequency cell, and ending;

s310, judging whether the terminal starts pilot frequency measurement or not, if so, executing a step S309; if not, executing S311;

s311, instructing the terminal to start pilot frequency measurement, and setting a timer;

s312, judging whether a pilot frequency switching measurement report is received before the timer is overtime, if so, executing the step S309; if not, go to step S313;

s313, switching the terminal to the pilot frequency cell, and ending the cell switching process.

An embodiment of the present application provides a cell handover apparatus for a multi-layer network, and as shown in fig. 5, the apparatus may include: the first signal threshold determining module 101, the pilot frequency measurement starting module 102, and the first switching module 103 specifically:

a first signal threshold determining module 101, configured to, if it is determined that the load of the pilot cell does not meet a first preset condition, obtain, based on user throughput, a signal quality threshold for the terminal to perform pilot measurement or pilot switching;

a pilot frequency measurement starting module 102, configured to instruct the terminal to start and perform pilot frequency measurement according to that signal quality of the terminal in a source cell is lower than a signal quality threshold if the source cell of the terminal is a higher-frequency cell;

the first switching module 103 is configured to switch the terminal to the lower frequency cell if it is determined that the inter-frequency handover measurement report reported after the terminal performs the inter-frequency measurement meets a preset handover condition.

The cell switching device of the multi-layer network provided in the embodiment of the present application specifically executes the process of the method embodiment, and please refer to the content of the cell switching method embodiment of the multi-layer network in detail, which is not described herein again. The cell switching device of the multi-layer network, provided by the embodiment of the application, acquires a signal quality threshold of a terminal for pilot frequency measurement or pilot frequency switching based on user throughput by determining that a load of a pilot frequency cell does not conform to a first preset condition, and instructs the terminal to start pilot frequency measurement when a source cell of the terminal is a higher frequency cell and the signal quality of the source cell of the terminal is lower than the signal quality threshold; if the pilot frequency switching measurement report reported after the pilot frequency measurement is started by the terminal is determined to meet the preset switching condition, the terminal is switched to the lower-frequency cell, so that the user can obtain the same user throughput after the pilot frequency switching is carried out, the high-capacity advantage of the high-frequency cell can be exerted, the coverage protection advantage of the low-frequency cell can be exerted, the stability of the user throughput is ensured under the condition that the coverage is not influenced, and the system capacity is further improved.

and the fourth switching module is used for switching the terminal to the same-frequency cell if the same-frequency switching measurement report reported by the terminal is received and the load of the different-frequency cell meets a second preset condition.

the fifth switching module is used for judging whether the terminal starts the pilot frequency measurement or not if the load of the pilot frequency cell does not accord with the second preset condition; and if the terminal is determined to start the pilot frequency measurement, switching the terminal to the same-frequency cell.

An embodiment of the present application provides an electronic device, including: a memory and a processor; at least one program stored in the memory for execution by the processor, which when executed by the processor, implements: the method comprises the steps that a signal quality threshold of a terminal for carrying out pilot frequency measurement or pilot frequency switching is obtained based on user throughput by determining that the load of a pilot frequency cell does not accord with a first preset condition, and when a source cell of the terminal is a higher frequency cell, the signal quality of the source cell of the terminal is lower than the signal quality threshold, the terminal is instructed to start pilot frequency measurement; if the pilot frequency switching measurement report reported after the pilot frequency measurement is started by the terminal is determined to meet the preset switching condition, the terminal is switched to the lower-frequency cell, so that the user can obtain the same user throughput after the pilot frequency switching is carried out, the high-capacity advantage of the high-frequency cell can be exerted, the coverage protection advantage of the low-frequency cell can be exerted, the stability of the user throughput is ensured under the condition that the coverage is not influenced, and the system capacity is further improved.

As shown in fig. 6, an embodiment of the present application further provides an access network device, including a memory 120, a transceiver 140, a processor 110;

a memory 120 for storing a computer program;

a transceiver 140 for receiving and transmitting data under the control of the processor 110;

a processor 110 for reading the computer program in the memory 120 and performing the following operations:

and if the pilot frequency switching measurement report reported after the terminal performs pilot frequency measurement is determined to meet the preset switching condition, switching the terminal to a lower frequency cell.

In a possible implementation manner, if a common-frequency handover measurement report reported by a terminal is received, the method further includes:

In one possible implementation, the method further includes:

Where, in fig. 6, the bus architecture may include any number of interconnected buses and bridges, in particular one or more of the processor 110, as represented by the processor 110, and the various circuits of the memory 120, as represented by the memory 120, are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. Bus interface 130 provides an interface. The transceiver 140 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The processor 110 is responsible for managing the bus architecture and general processing, and the memory 120 may store data used by the processor 110 in performing operations. For different user devices, the user interface 150 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 110 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and the processor 110 may also have a multi-core architecture.

The processor 110 is configured to execute any of the methods provided by the embodiments of the present application by calling the computer program stored in the memory 120 according to the obtained executable instructions. The processor 110 and the memory 120 may also be physically separated.

Referring to fig. 7, a schematic diagram of user distribution of a multi-layer network according to an embodiment of the present application is exemplarily shown, where a ratio of a 2.6GHz cell to a 700MHz cell in the multi-layer network is 3:1. at the initial moment, all users preferentially access the 2.6GHz cell, the users in the 2.6GHz cell are distinguished according to the shapes, the five-pointed star represents a user with an excellent point (signal quality), the circle represents a user with a good point, and the triangle and the square represent users with a poor point. By applying the method of the embodiment of the application, the square represents the users which do not send the same-frequency handover measurement report but start the different-frequency measurement, and the users are left in the 2.6GHz cell when the 700MHz cell is heavier in load, otherwise, the users are switched to the 700MHz cell.

The triangle represents the users who send the measurement report of the same-frequency switching, when the 700MHz cell is heavily loaded, the users are preferentially switched to the 2.6GHz cell with the same frequency, otherwise, the users are preferentially switched to the 700MHz cell, after a period of time, the users in the dotted line area are distributed in the 700MHz cell, and the rest users are distributed in 3 2.6GHz cells.

The cell switching method can ensure that the maximum throughput of the user is achieved under the condition of not influencing coverage, and further improves the system throughput; meanwhile, the load balance among all cells under the multi-layer network is ensured, and the switching triggered by the load unbalance under the multi-layer network is further avoided. Compared with reselection and switching based on coverage, the method can fully utilize the characteristics of a multi-layer network, not only can exert the high-capacity advantage of a high-frequency cell, but also can exert the coverage protection advantage of a low-frequency cell, and under the condition of not influencing coverage, the throughput of the UE is improved, and further the system capacity is improved.

Compared with reselection and switching based on load, the method utilizes the characteristic that the same-frequency adjacent cells and different-frequency adjacent cells exist under the multi-layer network, adjusts the cell reselection and switching strategy based on the load condition, inhibits the problem of unbalanced load among the multi-layer network, and avoids cell reselection and switching triggered by the load.

In an alternative embodiment, an electronic device is provided, as shown in fig. 8, the electronic device 4000 shown in fig. 8 comprising: a processor 4001 and a memory 4003. Processor 4001 is coupled to memory 4003, such as via bus 4002. Optionally, the electronic device 4000 may further comprise a transceiver 4004. In addition, the transceiver 4004 is not limited to one in practical applications, and the structure of the electronic device 4000 is not limited to the embodiment of the present application.

The Processor 4001 may be a CPU (Central Processing Unit), a general-purpose Processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (field programmable Gate Array) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 4001 may also be a combination that performs a computing function, e.g., comprising one or more microprocessors, a combination of DSPs and microprocessors, etc.

Bus 4002 may include a path that carries information between the aforementioned components. The bus 4002 may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 4002 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 8, but that does not indicate only one bus or one type of bus.

The Memory 4003 may be a ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, a RAM (Random Access Memory) or other type of dynamic storage device that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

The memory 4003 is used for storing application codes for executing the scheme of the present application, and the execution is controlled by the processor 4001. Processor 4001 is configured to execute application code stored in memory 4003 to implement what is shown in the foregoing method embodiments.

The embodiment of the present application provides a computer readable storage medium, on which a computer program is stored, and when the computer program runs on a computer, the computer is enabled to execute the corresponding content in the foregoing method embodiment. Compared with the prior art, the method comprises the steps that by determining that the load of the pilot frequency cell does not accord with a first preset condition, a signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching is obtained based on user throughput, and when the source cell of the terminal is a higher frequency cell, the signal quality of the source cell of the terminal is lower than the signal quality threshold, the terminal is instructed to start pilot frequency measurement; if the pilot frequency switching measurement report reported after the pilot frequency measurement is started by the terminal is determined to meet the preset switching condition, the terminal is switched to the lower-frequency cell, so that the user can obtain the same user throughput after the pilot frequency switching is carried out, the high-capacity advantage of the high-frequency cell can be exerted, the coverage protection advantage of the low-frequency cell can be exerted, the stability of the user throughput is ensured under the condition that the coverage is not influenced, and the system capacity is further improved.

The embodiment of the present application provides a computer program, which includes computer instructions stored in a computer-readable storage medium, and when a processor of a computer device reads the computer instructions from the computer-readable storage medium, the processor executes the computer instructions, so that the computer device executes the contents as shown in the foregoing method embodiment. Compared with the prior art, the method comprises the steps that by determining that the load of the pilot frequency cell does not accord with a first preset condition, a signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching is obtained based on user throughput, and when the source cell of the terminal is a higher frequency cell, the signal quality of the source cell of the terminal is lower than the signal quality threshold, the terminal is instructed to start pilot frequency measurement; if the pilot frequency switching measurement report reported after the pilot frequency measurement is started by the terminal is determined to meet the preset switching condition, the terminal is switched to the lower-frequency cell, so that the user can obtain the same user throughput after the pilot frequency switching is carried out, the high-capacity advantage of the high-frequency cell can be exerted, the coverage protection advantage of the low-frequency cell can be exerted, the stability of the user throughput is ensured under the condition that the coverage is not influenced, and the system capacity is further improved.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless otherwise indicated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of execution is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.

Claims

1. A cell handover method for a multi-layer network, wherein the multi-layer network includes at least one higher frequency cell and at least one lower frequency cell, the method comprising:

if the source cell of the terminal is the higher frequency cell, indicating the terminal to be started and carrying out pilot frequency measurement according to the condition that the signal quality of the terminal in the source cell is lower than the signal quality threshold;

and if the pilot frequency switching measurement report reported after the pilot frequency measurement of the terminal is determined to meet the preset switching condition, switching the terminal to the lower frequency cell.

2. The cell switching method according to claim 1, wherein the obtaining a signal quality threshold for the terminal to perform inter-frequency handover further comprises:

and if the source cell of the terminal is the lower frequency cell, switching the terminal to the higher frequency cell according to the condition that the signal quality of the higher frequency cell is higher than the signal quality threshold.

3. The cell switching method according to claim 2, wherein if the source cell of the terminal is the lower frequency cell, the method further comprises:

and instructing the terminal to perform pilot frequency measurement, and switching the terminal to the lower frequency cell if the pilot frequency switching measurement report reported after the pilot frequency measurement performed by the terminal is determined to meet a preset switching condition.

4. The cell switching method according to claim 1 or 3, wherein the terminal is instructed to perform inter-frequency measurement, and thereafter further comprising:

5. The cell switching method according to claim 4, wherein if the intra-frequency handover measurement report reported by the terminal is received, then further comprising:

6. The cell switching method according to claim 5, wherein the determining whether the terminal starts inter-frequency measurement further comprises:

if a pilot frequency switching measurement report reported by the terminal is received within a preset time, switching the terminal to the pilot frequency cell;

and if the pilot frequency switching measurement report reported by the terminal is not received within the preset time, switching the terminal to the co-frequency cell.

7. The cell switching method according to claim 1, wherein the obtaining the signal quality threshold for the inter-frequency handover performed by the terminal comprises:

8. The cell switching method according to claim 1, further comprising:

and if the load of the pilot frequency cell is determined to meet a first preset condition, acquiring a signal quality threshold of the terminal for pilot frequency measurement or pilot frequency switching based on coverage.

9. The cell handover method according to claim 1 or 8, wherein the first predetermined condition is that the load of the inter-frequency cell is greater than the load of the source cell and the difference between the loads of the inter-frequency cell and the source cell exceeds a first predetermined load threshold.

10. The cell switching method according to claim 4, wherein the second preset condition is that the load of the inter-frequency cell is greater than the load of the intra-frequency cell and a difference between the loads of the intra-frequency cell and the inter-frequency cell exceeds a second preset load threshold.

11. A cell switching apparatus of a multi-layer network, wherein the multi-layer network includes at least one higher frequency cell and at least one lower frequency cell, the apparatus comprising:

a pilot frequency measurement starting module, configured to instruct the terminal to start and perform pilot frequency measurement according to that the signal quality of the terminal in the source cell is lower than the signal quality threshold if the source cell of the terminal is the higher-frequency cell;

12. An access network device comprising a memory, a transceiver, a processor:

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

if the source cell of the terminal is a higher-frequency cell, indicating the terminal to be started and carrying out pilot frequency measurement according to the condition that the signal quality of the terminal in the source cell is lower than the signal quality threshold;

and if the pilot frequency switching measurement report reported after the pilot frequency measurement of the terminal is determined to meet the preset switching condition, switching the terminal to a lower frequency cell.

13. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the cell handover method of the multi-layer network according to any of claims 1 to 10 when executing the computer program.

14. A computer-readable storage medium, characterized in that it stores computer instructions that cause the computer to perform the steps of the method for cell handover of a multi-layer network according to any one of claims 1 to 10.