CN114190114B - Cell reselection method and related communication equipment - Google Patents

Cell reselection method and related communication equipment Download PDF

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Publication number
CN114190114B
CN114190114B CN202080039552.7A CN202080039552A CN114190114B CN 114190114 B CN114190114 B CN 114190114B CN 202080039552 A CN202080039552 A CN 202080039552A CN 114190114 B CN114190114 B CN 114190114B
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cell
reselection
signal quality
threshold
cell reselection
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CN114190114A (en
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刘圆圆
陈洪强
韩磊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The embodiment of the application relates to a cell reselection method, which comprises the following steps: for a neighboring cell with a reselection priority higher than the reselection priority of the current serving cell, then: when the signal quality of the current service cell is higher than or equal to a preset threshold, cell reselection to the adjacent cell is prevented to reside in the current service cell; and if the signal quality of the current serving cell is lower than the preset threshold and the adjacent cell meets the cell reselection condition, initiating cell reselection to the adjacent cell. Based on the cell reselection method, under the condition that the current service cell is a high network type 5G cell and the adjacent cell is a low network type 4G cell, the method can ensure that the UE resides in the current service cell of the high network type 5G under the condition that the signal quality of the current service cell of the high network type 5G is good, so that the user experience is improved. The cell reselection method provided by the embodiment of the application can avoid the problem caused by unreasonable cell reselection priority of the system configuration under the condition of not changing the cell reselection priority of the system configuration.

Description

Cell reselection method and related communication equipment
Technical Field
The present application relates to the field of wireless communications, and in particular, to a cell reselection method and related communication devices.
Background
With the application and development of mobile communication technology, especially with the deployment of 5G, currently, user Equipment (UE) on the market basically supports network systems such as second generation mobile communication technology (2G), third generation mobile communication technology (3G), fourth generation mobile communication technology (4G), and fifth generation mobile communication technology (5G) at the same time.
When the UE is in an idle state in the current service cell, the cell reselection process can be performed through intra-mode cell reselection or inter-mode cell reselection so as to reselect to a cell with higher priority and better channel quality. Currently, during cell reselection, cell reselection decisions are based on a combination of cell reselection priorities and cell signal quality (RSRP, RSRQ, SINR, etc.). For example, three cell reselection decision strategies are specified in the prior art: (1) If the UE is to reselect from the service cell with low reselection priority to the adjacent cell with high reselection priority, the signal quality of the adjacent cell with high reselection priority is only required to be higher than a certain threshold; (2) If the UE is to select between cells with the same reselection priority, only the signal quality of the adjacent cell is required to be higher than that of the current service cell; (3) If the UE is to reselect from a high reselection priority serving cell to a low reselection priority neighbor cell, the signal quality of the high reselection priority serving cell is below a certain threshold and the signal quality of the low reselection priority neighbor cell is above a certain threshold.
For the case where the UE is to reselect from a serving cell of low reselection priority to a neighboring cell of high reselection priority, it is easy to cause the UE to always preferentially camp on the cell of high reselection priority based on the cell reselection policy described in (1) above. The user experience is affected if the current high priority cell is not the most desirable cell for the user.
Disclosure of Invention
The present application provides a cell reselection method and related communication device for solving at least the above-mentioned drawbacks of the prior art.
According to a first aspect of the present application, there is provided a cell reselection method, characterized in that, for a neighboring cell having a reselection priority higher than a reselection priority of a current serving cell, then: when the signal quality of the current service cell is higher than or equal to a preset threshold, cell reselection to the adjacent cell is prevented to reside in the current service cell; and if the signal quality of the current serving cell is lower than the preset threshold and the adjacent cell meets the cell reselection condition, initiating cell reselection to the adjacent cell.
Based on the cell reselection method, under the condition that the signal quality of the current service cell is good, the current service cell is ensured to reside without reselecting the adjacent cell with the high reselection priority.
Alternatively, the neighboring cell is a heterogeneous cell or a homogeneous heterogeneous cell compared to the current serving cell.
Optionally, the current serving cell is a high network type 5G cell, and the neighboring cell is a low network type 4G cell. Thus, under the condition that the signal quality of the current service cell is good, the equipment is ensured to reside in the high-network-type 5G cell without reselecting to the adjacent 4G cell with high priority.
Optionally, if the duration that the signal quality of the neighboring cell is higher than or equal to the cell reselection threshold meets the cell reselection timer value, the neighboring cell meets a cell reselection condition.
In a first implementation manner, according to the first aspect, the method further includes: and when the signal quality of the current serving cell is lower than a first threshold, starting measurement of the signal quality of the adjacent cell and starting a timer to count the time period when the signal quality of the adjacent cell is higher than or equal to a cell reselection threshold.
In a first implementation manner, according to the first aspect, the method further includes: and when the signal quality of the current serving cell is higher than or equal to a first threshold, preventing starting the measurement of the signal quality of the adjacent cell. Based on this, when camping on the current serving cell, measurement is reduced in the case that the signal quality of the current serving cell is good, so that the power consumption of the device can be reduced.
Optionally, the first threshold is higher than the preset threshold. In this way, before the signal quality of the serving cell drops below the preset threshold, the UE starts measurement of the signal quality of the neighboring cell in advance and records the duration that the signal quality of the neighboring cell meets the cell reselection threshold, so that the neighboring cell can be quickly reselected when the signal quality of the current serving cell drops below the preset threshold.
In a first implementation manner, the preset threshold and the first threshold are optionally configured by a system, and the UE determines the preset threshold and the first threshold from received system broadcast information.
In a first implementation manner, the preset threshold and the first threshold are optionally preconfigured in the UE.
In a second implementation manner, according to the first aspect, the cell reselection method further includes: and when the UE receives the system information indicating the reselection priority of the current service cell and the reselection priority of the adjacent cell, starting measurement of the signal quality of the adjacent cell and starting a timer to count the time length that the signal quality of the adjacent cell is higher than or equal to a cell reselection threshold. In general, the UE receives such system information when entering a current serving cell. Therefore, the UE starts the measurement of the signal quality of the adjacent cells in advance so as to evaluate the time length that the signal quality of the adjacent cells meets the cell reselection threshold in advance, and can rapidly reselect the adjacent cells meeting the cell reselection condition when the signal quality of the current serving cell falls below the preset threshold.
In a first or second implementation manner, according to the first aspect, optionally, the neighboring cell is a plurality of neighboring cells, and the method further includes: and sequencing the plurality of adjacent cells according to the measurement results of the signal quality of the plurality of adjacent cells, and initiating cell reselection to the highest sequencing adjacent cell meeting the cell reselection condition.
In a second implementation manner, if the counted time length of the signal quality of the neighboring cell is higher than or equal to the cell reselection threshold meets the cell reselection timer value, the neighboring cell meets a cell reselection condition.
In a first or second implementation form, optionally, the values of the cell reselection threshold and the cell reselection timer value are configured by a system, the UE determining the cell reselection threshold and the cell reselection timer value from received system broadcast information.
In a first or second implementation form, the cell reselection threshold and the cell reselection timer value are optionally preconfigured in the UE.
In a first or second implementation manner, the preset threshold is optionally adjusted by the UE.
In a first or second implementation manner, optionally, the preset threshold is adjusted by the UE according to a frequency where the current serving cell is located and/or a fading condition of signal quality of the current serving cell.
According to the first aspect, in the first or second implementation manner, optionally, in a case where a frequency of a current serving cell is higher or a signal quality of the current serving cell decays faster, the UE increases the preset threshold, and conversely decreases the preset threshold. Therefore, under the condition that the signal quality decays fast, the preset threshold can be increased to avoid the network loss of the UE; in the case of slower signal attenuation, lowering the preset threshold may reduce the power consumption of the device.
In a first or second implementation form, the UE determines the reselection priority of the current serving cell and the reselection priority of the neighboring cell from the received system broadcast message.
In a first or second implementation form, the UE determines the reselection priority of the current serving cell and the reselection priority of the neighboring cell from the received dedicated signaling.
In a first or second implementation form, the parameter of the signal quality is optionally one or any combination of RSRP, RSRQ, SINR.
According to a second aspect of the present application there is provided a user equipment comprising a memory for storing instructions and a processor configured to perform any of the methods described above when the instructions are executed.
According to a third aspect of the present application, there is provided a computer readable storage medium having stored therein program code which when executed by a computer or processor implements any of the foregoing methods.
According to a fourth aspect of the present application, there is provided a computer program product comprising program code for implementing any of the methods described above when executed by a computer or processor.
According to a fifth aspect of the present application, there is provided a communication apparatus comprising a reselection decision module, wherein, for a neighboring cell having a reselection priority higher than a reselection priority of a current serving cell, the reselection decision module is configured to: when the signal quality of the current service cell is higher than or equal to a preset threshold, cell reselection to the adjacent cell is prevented to reside in the current service cell; and when the signal quality of the current serving cell is lower than the preset threshold and the adjacent cell meets the cell reselection condition, initiating cell reselection to the adjacent cell.
According to a fifth aspect of the present application, in a first implementation form, the communication device further comprises a measurement control module configured to: and when the signal quality of the current serving cell is higher than or equal to a first threshold, preventing starting the measurement of the signal quality of the adjacent cell.
According to a fifth aspect of the present application, in a first implementation manner, the measurement control module is configured to: and when the signal quality of the current serving cell is lower than a first threshold, starting measurement of the signal quality of the adjacent cell and starting a timer to count the time period when the signal quality of the adjacent cell is higher than or equal to a cell reselection threshold.
According to a fifth aspect of the present application, in a second implementation manner, the measurement control module is configured to: when the UE receives the system information indicating the reselection priority of the current service cell and the reselection priority of the adjacent cell, the UE starts the measurement of the signal quality of the adjacent cell and starts a timer to count the time length that the signal quality of the adjacent cell is higher than or equal to a cell reselection threshold.
According to a fifth aspect of the present application, in the first or second implementation manner, the neighboring cells are a plurality of neighboring cells, and the reselection decision module is configured to: and sequencing the plurality of adjacent cells according to the measurement results of the signal quality of the plurality of adjacent cells, and initiating cell reselection to the highest sequencing adjacent cell meeting the cell reselection condition.
In the embodiment of the application, when the signal quality of the service cell meets a specific condition, for example, is higher than or equal to the preset threshold, the UE guarantees that the user resides in the current service cell and prevents the cell from being reselected to a neighboring cell with high priority. In this way, the UE is not allowed to always preferentially select the high reselection priority cell to affect the user experience.
Drawings
Fig. 1 is a schematic diagram of a scenario of a cell reselection procedure provided in an embodiment of the present application;
fig. 2 is a flowchart of a cell reselection procedure provided by an embodiment of the present application;
fig. 3 is a schematic diagram of an implementation of a cell reselection procedure according to an embodiment of the present application;
fig. 4 is another implementation of a cell reselection procedure provided in an embodiment of the present application.
Fig. 5 is a schematic diagram of a terminal device for performing a cell reselection procedure according to an embodiment of the present application.
Fig. 6 is a schematic diagram of a communication device for performing a cell reselection procedure according to an embodiment of the present application.
Detailed Description
The technical scheme provided by the application is further described below with reference to the attached drawings and the embodiments. It should be understood that the system or application scenario provided in the embodiment of the present application is mainly for explaining some possible implementations of the technical solution of the present application, and should not be construed as a unique limitation of the technical solution of the present application. Those skilled in the art can appreciate that, with the evolution of the system and the appearance of updated application scenarios, the technical solution provided by the present application may still be applicable to the same or similar technical problems.
The terms "first," "second," and "third," and the like, in embodiments of the present application and in the drawings, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to denote a non-exclusive inclusion, such as a series of steps or elements. The method, system, article, or apparatus is not necessarily limited to only those steps or units listed and may include other steps or units not listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s).
It should be understood that, in the present application, the sequence of steps in each method does not mean that the execution sequence of the steps in each process or method should be determined by the functions and internal logic, and should not limit the implementation process of the embodiments of the present application.
Technical terms in the communication system to which the present application relates are described below.
The present application relates generally to a communication system and a device for providing a wireless network service and a device for using the wireless network service.
Devices providing wireless network services are those devices that make up a wireless communication network, which may be referred to simply as network devices (network equipment), or network elements. Network devices are typically owned by and are responsible for operation or maintenance by operators (e.g., china mobile and Vodafone) or infrastructure providers (e.g., iron tower companies). The network devices may be further divided into radio access network (radio access network, RAN) devices and Core Network (CN) devices. A typical RAN apparatus includes a Base Station (BS).
It should be appreciated that a base station may also sometimes be referred to as a wireless Access Point (AP), or a transmitting receiving point (transmission reception point, TRP). Specifically, the base station may be a general node B (generation Node B, gNB) in a 5G new radio, NR, system, and an evolved node B (evolutional Node B, eNB) of a 4G long term evolution (long term evolution, LTE) system. Base stations may be classified as macro base stations (macro base station) or micro base stations (micro base station) depending on their physical form or transmit power. Micro base stations are sometimes also referred to as small base stations or small cells (small cells).
Devices that use wireless network services are typically located at the edge of the network and may be referred to simply as terminal (terminal) devices. The terminal device can establish connection with the network device and provide specific wireless communication service for the user based on the service of the network device. It should be appreciated that because of the closer relationship of the terminal device to the user, sometimes referred to as a User Equipment (UE), or Subscriber Unit (SU). In addition, with respect to base stations that are typically placed at fixed locations, terminal devices tend to move with users, sometimes also referred to as Mobile Stations (MSs). In addition, some network devices, such as a Relay Node (RN) or a wireless router, may be considered terminals because they have UE identities or belong to users.
Specifically, the terminal device may be a mobile phone (mobile phone), a tablet computer (tablet computer), a laptop computer (laptop computer), a wearable device (such as a smart watch, a smart bracelet, a smart helmet, a smart glasses), and other devices with wireless access capability, such as a smart car, various internet of things (internet of thing, IOT) devices, including various smart home devices (such as smart electric meters and smart home appliances), and smart city devices (such as security or monitoring devices, intelligent road transportation facilities), and the like.
The network type refers to a network type, for example, LTE (long term evolution) (4G), NR (New Radio) (5G), GERAN (GSM EDGE Radio Access Network) (2G), WCDMA (Wideband Code Division Multiple Access) (3G), UTRAN (UMTS Terrestrial Radio Access Network) (3G), and the like.
In the present application, the term "high network system" refers to a network system of 5G which is higher than a network system of 4G, and a network system of 4G which is higher than a network system of 3G or 2G. For example, LTE belongs to 4G and NR belongs to 5G, so the network system of NR is higher than that of LTE. With the development of communication technology, there may be a 6G network, where the network system of the 6G network is higher than the network system of the NR under 5G.
A serving cell refers to a cell in which a UE currently resides or a cell in which data transmission is being provided for the UE.
Cell reselection refers to a process in which a UE measures and evaluates signal quality of a current serving cell and neighbor cells to find a neighbor cell better than the current serving cell while camping in the current serving cell and selects the neighbor cell to provide service.
"Inter-system (Inter-RAT) cell reselection" refers to cell reselection between cells of different types of radio access networks. For example, the serving cell and the neighboring cell have different network formats, which typically employ different Radio Access Technologies (RATs), and thus belong to different RAT systems. Cell reselection to neighboring cells for such serving cells is therefore considered to be "Inter-system (Inter-RAT) cell reselection". If the serving cell and the neighboring cell are different frequency points of the same radio access network, then the cell reselection from the serving cell to the neighboring cell is an "inter-frequency cell reselection".
The present application is directed to a case of heterogeneous cell reselection, inter-system (Inter-RAT) cell reselection or Inter-frequency cell reselection by a terminal device, e.g., a UE, from a serving cell of low reselection priority to a neighboring cell of high reselection priority. The embodiment of the application describes a scene that the high-system network reselection priority is lower than the low-system network reselection priority, namely, the cell reselection from a service cell with high-system low reselection priority to a neighboring cell with low-system high reselection priority.
The embodiment of the application specifically describes a cell reselection process by taking the example of cell reselection from a 5G high network type NR service cell with low reselection priority to a 4G low network type EUTRA adjacent cell with high reselection priority. The cell reselection procedure between other network systems is also applicable, for example, to reselect a serving cell of a 4G network system with a low reselection priority to a cell of a low network system with a high reselection priority, for example, 2G, 3G, etc.
For convenience of description, in the embodiment of the present application, a base station BS and a user equipment UE will be taken as examples, and a technical solution of the embodiment of the present application will be described in detail.
Fig. 1 is a schematic diagram of a cell reselection procedure according to an embodiment of the present application.
As shown in fig. 1, the UE is currently camping on a serving Cell 1. For example, as the UE moves, the signal quality becomes worse, and the current serving Cell1 may not be the optimal Cell. The UE may measure the signal quality of the current serving Cell1 and the neighboring Cell2, in particular the neighboring Cell2 of high reselection priority, in an idle state to determine whether to reselect to such neighboring Cell 2. The UE, when idle, takes precedence measurements for cells with higher reselection priorities than the serving Cell1, e.g. Cell2, to evaluate whether to reselect to such a neighboring Cell2 with higher reselection priority than the serving Cell.
Here, the neighboring cell of high priority may be a heterogeneous cell or a heterogeneous system cell or a heterogeneous frequency cell compared to the current serving cell. For example, the high priority neighbor cell is a low network format 4G, e.g., EUTRA, and the low priority current serving cell is a high network format 5G, e.g., NR.
For ease of illustration, fig. 1 shows only one neighboring Cell 2. This is merely exemplary. There may be several such high reselection priorities of neighboring cells Cell 2.
The base station BS1 may broadcast system information periodically in its serving Cell 1. The UE receives the system information in the serving Cell1, which indicates the reselection priority corresponding to the current serving Cell1 and the reselection priority corresponding to the neighboring Cell 2.
In general, the serving cell and each neighboring cell correspond to a particular RAT and corresponding frequency point based on the respective network system. For example, the current serving cell is a high network format 5G, the corresponding RAT is NR, the neighboring cell is a low network format 4G, and the corresponding RAT is EUTRA.
Before the UE selects the serving Cell1, the UE may be preconfigured with RAT corresponding to the neighboring Cell 2, such as frequency point information of EUTRA, and a corresponding reselection priority. Thus, the UE can learn the reselection priority corresponding to the neighboring Cell 2. Other manners may be adopted to learn the reselection priority corresponding to the current serving Cell1 and the reselection priority corresponding to the neighboring Cell 2. For example, the UE acquires the reselection priority corresponding to the serving Cell1 and the reselection priority corresponding to the neighboring Cell 2 by receiving dedicated signaling, for example, RRC signaling. The manner in which the UE obtains the information of the reselection priority is not limited to the above.
The UE may learn, through the received or preconfigured reselection priority information, a neighboring Cell 2 having a higher reselection priority than the current serving Cell 1.
The Cell reselection method provided by the embodiment of the application aims at evaluating the Cell reselection of the adjacent Cell 2 with the reselection priority higher than that of the current serving Cell 1.
In the cell reselection method in the embodiment of the present application, for the neighboring cell with the reselection priority higher than the reselection priority of the current serving cell, the following steps are performed: when the signal quality of the current service cell is higher than or equal to a preset threshold, cell reselection to the adjacent cell is prevented to reside in the current service cell; and if the signal quality of the current serving cell is lower than the preset threshold and the adjacent cell meets the cell reselection condition, initiating cell reselection to the adjacent cell.
Fig. 2 is a flowchart of a cell reselection procedure performed by a UE according to an embodiment of the present application. As shown in step S10, the UE camps on the current serving cell. Next, as shown in step S12, for a neighboring cell having a higher reselection priority than the current serving cell, the UE determines whether the neighboring cell satisfies a cell reselection condition. If the neighboring cell satisfies the cell reselection condition, the UE determines whether the signal quality of the current serving cell is below a preset threshold, as shown in step S13. If the signal quality of the current serving cell is lower than a preset threshold, the UE initiates cell reselection to the adjacent cell; if the signal quality of the current serving cell is not below the preset threshold, i.e., is greater than or equal to the preset threshold, the UE continues to camp on the current serving cell and prevents cell reselection to the neighboring cell.
The cell reselection condition herein may be, for example, that a time period in which the signal quality of the neighboring cell is higher than or equal to a cell reselection threshold and the signal quality of the clocked neighboring cell is higher than or equal to the cell reselection threshold satisfies a cell reselection timer value. This is merely exemplary and not limiting. Other cell reselection conditions may also be employed.
The order of steps S12 and S13 described above is exemplary. For example, step S13 may be performed first, i.e. determining whether the signal quality of the current serving cell is below a preset threshold. If not, i.e. the signal quality of the current serving cell is higher than or equal to the preset threshold, the UE continues to camp on the current serving cell and prevents cell reselection to the neighboring cell. If the signal quality of the current serving cell is lower than the preset threshold, step S12 is executed, and the UE determines whether the neighboring cell satisfies the cell reselection condition, and if so, initiates cell reselection to the neighboring cell.
One specific implementation of the cell reselection procedure provided by the embodiment of the present application is described in detail below in conjunction with the specific scenario of fig. 3.
The present implementation takes as an example the cell reselection where the current serving cell is a low priority 5G mode NR cell and the neighboring cell is a high priority 4G mode EUTRA cell.
Specifically, the UE camps on the current serving NR cell and receives system broadcast information from the base station gNodeB, such as system information blocks SIB2 and SIB5, which carry information that may be seen in 3gpp TS 38.304. Specifically, the SIB2 carries a cell reselection parameter corresponding to the current serving cell, for example, a cellreselection priority and a cellreselection sub priority (optional) cell, which indicate frequency point information of an NR system corresponding to the current serving cell and corresponding cell reselection priority information, so that the UE acquires the reselection priority corresponding to the current serving NR cell by receiving the SIB 2. The SIB5 carries cell reselection parameters corresponding to the neighboring cells, for example, a cellreselection priority and a cellreselection sub priority (optional) cell, and indicates frequency point information and corresponding reselection priority information of an EUTRA system corresponding to the neighboring cells, so that the UE obtains the reselection priority information corresponding to the neighboring EUTRA cell by receiving the SIB 5. The embodiments of the present application are not limited thereto.
The UE may determine the neighboring EUTRA cells with high priority by the received cell reselection parameters described above, e.g., cellreselection priority. If the two cells, that is, the current serving NR cell and the adjacent EUTRA cell, have different cellReselection priority corresponding to the frequency point where the two cells are located, the reselection priorities of the two cells can be compared by the cellReselection priority of the two cells. If the cellReselection priority is the same and there is a cellReselection sub priority cell, the reselection priorities of the two cells can be compared by the cellReselection sub priority of the two cells. Further details of the information of the reselection priorities described above may be found in the 3gpp TS 38.304 protocol specification. The embodiments of the present application are not limited thereto.
The UE may measure the signal quality of the current serving NR cell and the neighboring EUTRA cell to evaluate whether a cell reselection to the neighboring EUTRA cell is to be made. The parameter of the signal quality may be one or any combination of RSRP (Reference Signal Received Power ), RSRQ (Reference Signal Received Quality, reference signal received quality), SINR (Signal to Interference plus Noise Ratio ). The specific way in which the UE measures the signal quality of the current serving NR cell and the neighboring EUTRA cell is well known to those skilled in the art and will not be described in detail here.
In this implementation, as shown in step S21, in case the signal quality of the current serving NR cell is good, for example above a first threshold, the UE prevents starting the measurement of the EUTRA cell. This may reduce the measurement and reduce the power consumption of the UE. Preferably, the first threshold is higher than the preset threshold, so that in practice, in case the signal quality of the current serving cell gradually decreases as the UE moves, the UE starts the measurement of the EUTRA cell in advance before the signal quality decreases to the preset threshold.
As shown in step S22, when the signal quality of the currently serving NR cell is below a first threshold, a measurement of the signal quality of the EUTRA cell is initiated. Preferably, when the measurement is started, a timer is started to count a time period when the signal quality of the EUTRA cell is higher than or equal to a cell reselection threshold. The cell reselection threshold here may be referred to as 3gpp TS 38.304, e.g. contained in SIB5, sent to the UE. Here, the value of the first threshold may be configured by the system, and is included in the system information to be broadcast to the UE. Of course, the cell reselection threshold and the first threshold herein may also be preconfigured in the UE. Further, in step S22, a buffer value may be set, i.e. a measurement of the signal quality of the neighboring EUTRA cell is started when the signal quality of the current serving NR cell falls below a buffer value smaller than the first threshold.
Further, as shown in step S23, when the signal quality of the current serving NR cell is higher than or equal to the preset threshold, the UE continues to camp on the current serving NR cell and prevents cell reselection to the EUTRA cell. Thus, under the condition that the signal quality of the current service NR cell is good, the resident in the current service NR cell is ensured without reselecting the EUTRA cell with the high reselection priority. It will be appreciated that at this time, as shown in step S23, even if it is determined that the duration of time that the signal quality of the neighboring EUTRA cell is higher than or equal to the cell reselection threshold satisfies the cell reselection timer value, if the signal quality of the current serving cell is higher than or equal to the preset threshold, the current serving NR cell remains camped on and cell reselection to the neighboring EUTRA cell of high reselection priority is prevented.
Here, the preset threshold may be system-configured, for example, the system information broadcast by the base station gNodeB in the current serving NR cell includes a value of the preset threshold. The UE determines the preset threshold from the received system information for use in the cell reselection method. The system may add information indicating the preset threshold to an existing system information block or define a system information block separately to indicate the value of the preset threshold, and broadcast the separately defined system information block to the UE in the current serving NR cell.
The present embodiment is not limited thereto. The preset threshold may also be preconfigured in the UE.
Further, as shown in step S24, when the signal quality of the current serving NR cell is lower than the preset threshold, if the adjacent EUTRA cell satisfies a cell reselection condition, for example, the signal quality of the adjacent EUTRA cell is higher than or equal to the cell reselection threshold and the time duration of the counted signal quality of the adjacent cell is higher than or equal to the cell reselection threshold satisfies a cell reselection timer value, cell reselection to the adjacent EUTRA cell is initiated.
Here, the cell reselection timer value may be referred to, for example, as T defined in 3gpp TS 38.304 reselectionRAT Which is transmitted to the UE, for example, contained in SIB 5. Different cell reselection timer values (T may be defined for different RAT technologies reselectionRAT ). The cell reselection timer value may be configured by the system, as is well known to those skilled in the art and will not be described in detail.
It will be appreciated that in a practical scenario there may be more than one neighbouring EUTRA cell with a higher reselection priority than the current serving NR cell.
The UE may measure the signal quality of these high priority neighboring EUTRA cells and then rank the signal quality of these high priority neighboring EUTRA cells according to the measurement result. When the signal quality of the current serving NR cell falls below a preset threshold, the UE initiates cell reselection to the adjacent EUTRA cell with highest signal quality ranking which meets the cell reselection condition.
In this implementation, the first threshold is greater than a preset threshold. When the signal quality of the serving cell is reduced below a first threshold, and the signal quality of the adjacent EUTRA cell is not reduced below a preset threshold, the UE starts measurement of the signal quality of the adjacent EUTRA cell in advance and records the time length that the signal quality of the adjacent EUTRA cell meets the cell reselection threshold. Thus, when the signal quality of the current serving NR cell drops below a preset threshold, the adjacent EUTRA cell meeting the reselection condition can be quickly reselected.
In this implementation, the advantage of such a setting that the first threshold is greater than the preset threshold is that: when the NR cell is not attenuated to a preset threshold, the signal quality of the adjacent cell is started to be measured in advance, and the adjacent cell meeting the reselection condition is determined, so that when the signal quality of the NR cell is attenuated to be below the preset threshold, the adjacent cell can be quickly reselected, and the network loss of the UE is avoided.
In this implementation, the preset threshold may be a fixed value, that is, a fixed value that the UE may set, or a dynamically adjusted value. The preset threshold may be adjusted by the UE. The UE adjusts according to the frequency in which the current serving NR cell is located and/or the attenuation of the signal quality of the current serving NR cell. Preferably, the UE adjusts the preset threshold higher in the case that the frequency of the current serving cell is higher or the signal quality of the current serving cell is attenuated faster, and otherwise adjusts the preset threshold lower. Therefore, under the condition that the signal quality decays fast, the preset threshold can be increased to avoid the network loss of the UE; in the case of slower signal attenuation, lowering the preset threshold may reduce the power consumption of the device.
In a practical scenario, in view of network deployment of operators, there may be a case where the reselection priorities of not less than 5G cells and the reselection priorities of 4G cells are the same, or even lower than the reselection priorities of 4G cells in the network configuration, that is, the reselection priorities of cells in a high network system (e.g., 5G) are lower than the reselection priorities of cells in a low network system (e.g., 4G, etc.). In this case, based on the cell reselection in the implementation manner, the current serving cell is a high-network-type 5G cell with a low priority, and the neighboring cell is a low-network-type 4G cell with a high priority, so that the UE can be ensured to reside in the current serving cell of the high-network-type 5G under the condition that the signal quality of the current serving cell of the high-network-type 5G is good, thereby improving the user experience. Further, the first threshold for starting to measure the signal quality of the adjacent cell is increased, for example, is higher than the preset threshold, so that the UE evaluates the signal quality of the adjacent cell in advance to meet the cell reselection threshold, and the UE can quickly initiate cell reselection to the new cell to avoid network loss of the UE in the scene of quick degradation of the signal quality of the serving cell.
Another specific implementation of the cell reselection procedure provided by the embodiment of the present application is described in detail below with reference to the flowchart of fig. 4.
The present implementation still takes as an example the cell reselection from the current serving NR cell of the low priority 5G format to the neighboring EUTRA cell of the high priority 4G format.
The difference from the cell reselection procedure of fig. 3 is that in this implementation, as shown in step S31, measurement of the signal quality of the EUTRA cell is started immediately upon determining that the EUTRA cell reselection priority is higher than the reselection priority of the current serving NR cell.
Specifically, the UE initiates measurement of signal quality of a neighboring EUTRA cell indicating a high reselection priority upon receiving system information of the neighboring EUTRA cell.
Similar to fig. 3, the UE camps on the current serving NR cell and receives system broadcast information, e.g. system information blocks SIB2 and SIB5, from the base station gNodeB, which carries information as described above with respect to fig. 3. And will not be described in detail here.
Thus, as shown in step S31, measurement of signal quality of the neighboring EUTRA cell is initiated when the UE receives system information (e.g., system information blocks SIB2 and SIB 5) indicating the reselection priority of the current serving NR cell and the reselection priority of the neighboring EUTRA cell. Optionally, when the measurement of the signal quality of the EUTRA cell is started, a timer is started to count the time period that the signal quality of the adjacent EUTRA cell is higher than or equal to the cell reselection threshold. Here, the cell reselection threshold is transmitted to the UE, for example, contained in SIB 5.
When the signal quality of the current serving NR cell is higher than or equal to the preset threshold, the UE continues to camp on the current serving NR cell and prevents cell reselection to the EUTRA cell, as shown in step S32.
When the signal quality of the current serving NR cell is below the preset threshold and the neighboring EUTRA cell meets the cell reselection condition, e.g., the duration of the signal quality being higher than or equal to the cell reselection threshold is met (i.e.Up) cell reselection timer value (T reselectionRAT ) And when the cell reselection of the adjacent EUTRA cell is initiated.
In this implementation, in general, the UE receives system information, including SIB2 and SIB5 described above, while camping on the current serving NR cell. Through the received system information, the UE acquires the adjacent EUTRAN cell with the reselection priority higher than that of the current serving NR cell, and the UE starts the measurement of the signal quality of the adjacent EUTRA cell, so that the time length that the signal quality of the adjacent EUTRAN cell meets the cell reselection threshold can be estimated in advance, and the EUTRA cell can be quickly reselected when the signal quality of the current serving NR cell falls below the preset threshold.
The cell reselection method provided by the embodiment of the invention can avoid various problems caused by unreasonable cell reselection priority of system configuration under the condition of not changing the cell reselection priority and the cell reselection timer value of the system configuration. The method can enable the UE to reside in the current service cell as much as possible without reselecting to a neighboring cell with high priority under the condition that the signal of the current service cell is good enough. Cell reselection can be rapidly performed when the current service cell is poor, so that network loss of the UE is avoided, and the method is particularly suitable for a scene of rapid signal decay of a 5G network.
The methods of embodiments of the present application may include various other operations and/or variations of the illustrated operations. Also, the order of the steps of the flowcharts may be modified. It should be understood that not all steps in the flow chart are performed.
In the above-described embodiments of the present application, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer program codes or computer program instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus.
Fig. 5 is a schematic diagram of a terminal device for performing the above cell reselection procedure according to an embodiment of the present application.
As shown in fig. 5, a terminal device, such as a User Equipment (UE) 100, includes a processor 101, a memory 102, and a transceiver 103. The processor 101 is configured to implement processing of communication protocols and communication data by executing computer-readable and executable instructions (or codes) such as program modules, or the like.
Memory 102 is used to store computer readable and executable instructions (or code) and data such as program modules. The transceiver 103 is used for reception and transmission of data. For ease of illustration, only memory 102 and processor 101 and transceiver 103 are shown in fig. 5. In addition to the above components, the UE may include other various types of components or components performing various functions, and other components are not listed here in order to avoid obscuring the technical solution proposed by the present application.
The methods of embodiments of the present application may be implemented by processor 101 by executing computer-readable and executable instructions (or code). Computer readable and executable instructions (or code), such as program modules, may reside in the memory 102. By way of example, memory 102 may comprise a non-transitory computer storage medium.
Specifically, in performing the method of an embodiment of the present application, for example, the transceiver 103 receives data from a base station and transmits the data to the processor 101. The data here includes, but is not limited to, the system information described above, such as SIB2 and SIB5. The data herein may also include other various types of information, as desired.
The processor 101, when executing computer-readable and/or executable instructions (or code), implements the methods of the above-described embodiments. If it is determined that a cell reselection to a neighboring cell is to be initiated, the processor 101 sends control information to the transceiver 103, which transceiver 103 in turn signals the cell reselection to the base station of the neighboring cell to initiate a cell reselection to the neighboring cell, as shown in steps S14, S24 or S33.
The application also provides a computer program product comprising computer program code or computer program instructions for implementing any of the methods of the embodiments of the application when the computer program code or computer program instructions are executed by a computer or processor.
The computer program code or computer program instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, etc.) or wireless (e.g., infrared, radio, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. Computer-readable media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data. Computer-readable media include, but are not limited to: random Access Memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk ROM (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed to retrieve the information.
Fig. 6 is a schematic diagram of a communication device for performing a cell reselection procedure according to an embodiment of the present application.
The communication device 200 comprises a measurement control module 201 and a reselection decision module 202.
In performing the method of the embodiment of the present application, for a neighboring cell having a reselection priority higher than the reselection priority of the current serving cell, the reselection decision module 202 may be configured to: when the signal quality of the current service cell is higher than or equal to a preset threshold, cell reselection to the adjacent cell is prevented to reside in the current service cell; and if the signal quality of the current serving cell is lower than the preset threshold and the adjacent cell meets the cell reselection condition, initiating cell reselection to the adjacent cell.
In performing the method of the first implementation of the embodiment of the present application, the measurement control module 201 may be configured to: and when the signal quality of the current serving cell is higher than or equal to a first threshold, preventing starting the measurement of the signal quality of the adjacent cell.
In performing the method of the first implementation of the embodiment of the present application, the measurement control module 201 may be configured to: and when the signal quality of the current serving cell is lower than a first threshold, starting measurement of the signal quality of the adjacent cell and starting a timer to count the time period when the signal quality of the adjacent cell is higher than or equal to a cell reselection threshold.
In performing the method of the second implementation of the embodiment of the present application, the measurement control module 201 may be configured to: when the UE receives the system information indicating the reselection priority of the current service cell and the reselection priority of the adjacent cell, the UE starts the measurement of the signal quality of the adjacent cell and starts a timer to count the time length that the signal quality of the adjacent cell is higher than or equal to a cell reselection threshold.
In performing the method of the first or second implementation of the embodiment of the present application, the neighboring cells are a plurality of neighboring cells, and the reselection determination module 202 may be configured to: and sequencing the plurality of adjacent cells according to the measurement results of the signal quality of the plurality of adjacent cells, and initiating cell reselection to the highest sequencing adjacent cell meeting the cell reselection condition.
While the application has been described with respect to the preferred embodiments, it will be apparent to those skilled in the art that various changes and substitutions can be made herein without departing from the scope of the application as defined by the appended claims. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (20)

1. A cell reselection method, comprising: for a neighboring cell with a reselection priority higher than the reselection priority of the current serving cell, then: when the signal quality of the current service cell is higher than or equal to a preset threshold, cell reselection to the adjacent cell is prevented to reside in the current service cell; when the signal quality of the current serving cell is higher than or equal to a first threshold, stopping starting the measurement of the signal quality of the adjacent cell, wherein the first threshold is higher than the preset threshold; and if the signal quality of the current serving cell is lower than the preset threshold and the adjacent cell meets the cell reselection condition, initiating cell reselection to the adjacent cell.
2. The cell reselection method of claim 1, wherein the neighboring cell is a heterogeneous cell or a homogeneous heterogeneous frequency cell compared to a current serving cell.
3. The cell reselection method of claim 1 or 2, wherein the current serving cell is a high network type 5G cell and the neighboring cell is a low network type 4G cell.
4. The cell reselection method of claim 1 or 2, wherein the neighboring cell satisfies a cell reselection condition if a duration of time that the signal quality of the neighboring cell is greater than or equal to a cell reselection threshold satisfies a cell reselection timer value.
5. The cell reselection method of claim 1 or 2, wherein the cell reselection method further comprises: and when the signal quality of the current serving cell is lower than a first threshold, starting measurement of the signal quality of the adjacent cell and starting a timer to count the time period when the signal quality of the adjacent cell is higher than or equal to a cell reselection threshold.
6. The cell reselection method of claim 1, wherein the preset threshold and the first threshold are configured by a system, the preset threshold, the first threshold being determined by a UE from received system broadcast information.
7. The cell reselection method of claim 1, wherein the preset threshold and the first threshold are preconfigured in a UE.
8. The cell reselection method of claim 1 or 2, wherein the neighboring cell is a plurality of neighboring cells, the method further comprising: and sequencing the plurality of adjacent cells according to the measurement results of the signal quality of the plurality of adjacent cells, and initiating cell reselection to the highest sequencing adjacent cell meeting the cell reselection condition.
9. The cell reselection method of claim 4, wherein values of the cell reselection threshold and the cell reselection timer value are configured by a system from which a UE determines the cell reselection threshold and the cell reselection timer value from received system broadcast information.
10. The cell reselection method of claim 4, wherein the cell reselection threshold and the cell reselection timer value are preconfigured in a UE.
11. The cell reselection method of claim 1 or 2, wherein the preset threshold is adjusted by the UE.
12. The cell reselection method of claim 11, wherein the preset threshold is adjusted by the UE according to a frequency at which the current serving cell is located and/or a fading condition of signal quality of the current serving cell.
13. The cell reselection method of claim 1 or 2, wherein the UE determines the reselection priority of the current serving cell and the reselection priorities of neighboring cells from the received system broadcast message.
14. The cell reselection method of claim 1 or 2, wherein the UE determines the reselection priority of the current serving cell and the reselection priorities of the neighboring cells from the received dedicated signaling.
15. The cell reselection method of claim 1 or 2, wherein the parameter of signal quality is one or any combination of RSRP, RSRQ, SINR.
16. A user equipment comprising a memory for storing instructions and a processor configured to perform any of the methods of any of claims 1-15 when the instructions are executed.
17. A computer readable storage medium having stored therein program code which when executed by a computer or processor implements any of the methods of any of claims 1-16.
18. A communication apparatus, comprising: a reselection decision module and a measurement control module, wherein, for a neighboring cell having a reselection priority higher than the reselection priority of the current serving cell, the reselection decision module is configured to: when the signal quality of the current service cell is higher than or equal to a preset threshold, cell reselection to the adjacent cell is prevented to reside in the current service cell; the measurement control module is configured to: when the signal quality of the current serving cell is higher than or equal to a first threshold, stopping starting the measurement of the signal quality of the adjacent cell, wherein the first threshold is higher than the preset threshold; the reselection decision module is further configured to: and if the signal quality of the current serving cell is lower than the preset threshold and the adjacent cell meets the cell reselection condition, initiating cell reselection to the adjacent cell.
19. The communication device of claim 18, wherein the measurement control module is configured to: and when the signal quality of the current serving cell is lower than a first threshold, starting measurement of the signal quality of the adjacent cell and starting a timer to count the time period when the signal quality of the adjacent cell is higher than or equal to a cell reselection threshold.
20. The communication device of claim 18 or 19, wherein the neighboring cell is a plurality of neighboring cells, the reselection decision module configured to: and sequencing the plurality of adjacent cells according to the measurement results of the signal quality of the plurality of adjacent cells, and initiating cell reselection to the highest sequencing adjacent cell meeting the cell reselection condition.
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