CN112312499A - Cell reselection method and device - Google Patents
Cell reselection method and device Download PDFInfo
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- CN112312499A CN112312499A CN202011200713.4A CN202011200713A CN112312499A CN 112312499 A CN112312499 A CN 112312499A CN 202011200713 A CN202011200713 A CN 202011200713A CN 112312499 A CN112312499 A CN 112312499A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- 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
Abstract
The application discloses a cell reselection method and a device thereof. The method comprises the following steps: if the cell reselection condition is met, acquiring a measured value of the signal-to-noise ratio of a serving cell signal; judging whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold value or not; and if the measured value of the signal-to-noise ratio is smaller than a preset threshold value, initiating a cell reselection process. By implementing the embodiment of the application, the situation of ping-pong reselection can be avoided.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a cell reselection method and apparatus.
Background
Cell reselection may be triggered when the terminal device is at the edge of two cells. According to the 3rd Generation Partnership Project (3 GPP), whether or not to trigger cell reselection is determined by a measurement value of Reference Signal Receiving Power (RSRP) of a Reference serving cell and neighbor cells.
In an actual networking environment of an operator, the RSRP measurement values of multiple cells may be approximate in the same location, which may cause the terminal device to repeatedly reselect among the multiple cells, that is, ping-pong reselection may be caused.
Disclosure of Invention
The application discloses a cell reselection method and a cell reselection device, which are beneficial to avoiding the ping-pong reselection condition.
In a first aspect, the present application provides a cell reselection method, applied to a terminal device, where the method includes: if the cell reselection condition is met, acquiring a measured value of the signal-to-noise ratio of a serving cell signal; judging whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold value or not; and if the measured value of the signal-to-noise ratio is smaller than the preset threshold value, initiating a cell reselection process.
In one embodiment, the cell reselection method further comprises: measuring the signal-to-noise ratio of a cell signal to be accessed; judging whether the measured value of the signal-to-noise ratio of the signal of the cell to be accessed is smaller than the preset threshold value or not; and if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is greater than or equal to the preset threshold value, initiating a cell reselection process.
In one embodiment, the cell reselection method further comprises: and if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is less than the preset threshold value, the cell signal to be accessed resides in the serving cell.
In one embodiment, the cell reselection method further comprises: receiving a first system message broadcasted by the serving cell, wherein the first system message carries cell reselection parameters; measuring Reference Signal Received Power (RSRP) of a cell to be accessed to obtain an RSRP measurement value of the cell to be accessed; and judging whether the cell reselection condition is met according to the RSRP measurement value of the cell to be accessed and the cell reselection parameter.
In one embodiment, the cell reselection method further comprises: and under the condition that the cell measurement is determined to be started, triggering and executing the step of measuring the Reference Signal Received Power (RSRP) of the cell to be accessed.
In one embodiment, the cell reselection method further comprises: measuring the RSRP of the serving cell to obtain an RSRP measurement value of the serving cell; judging whether cell measurement is started or not according to the RSRP measurement value of the serving cell and the measurement starting parameter; the measurement initiation parameter is carried in a second system message, which is broadcast by the serving cell.
In one embodiment, the preset threshold is determined according to a demodulation capability of a physical layer of the terminal device.
In a second aspect, the present application provides a communication device comprising:
an obtaining unit, configured to obtain a measured value of a signal-to-noise ratio of a serving cell signal if a cell reselection condition is satisfied;
a judging unit, configured to judge whether a measured value of a signal-to-noise ratio of the serving cell signal is smaller than a preset threshold;
and the processing unit is used for initiating a cell reselection process if the measured value of the signal-to-noise ratio is smaller than the preset threshold value.
In one embodiment, the communication device further comprises: the measuring unit is used for measuring the signal-to-noise ratio of the cell signal to be accessed; the judging unit is further configured to judge whether a measured value of a signal-to-noise ratio of a signal of a cell to be accessed is smaller than the preset threshold; the processing unit is further configured to initiate a cell reselection procedure if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold and the measured value of the signal-to-noise ratio of the to-be-accessed cell signal is greater than or equal to the preset threshold.
In an embodiment, the processing unit is further configured to camp in the serving cell if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold and the measured value of the signal-to-noise ratio of the to-be-accessed cell signal is smaller than the preset threshold.
In one embodiment, the communication device further comprises: a receiving unit, configured to receive a first system message broadcasted by a serving cell, where the first system message carries a cell reselection parameter; the measuring unit is further configured to measure Reference Signal Received Power (RSRP) of a cell to be accessed to obtain an RSRP measurement value of the cell to be accessed; the judging unit is further configured to judge whether the cell reselection condition is satisfied according to the RSRP measurement value of the cell to be accessed and the cell reselection parameter.
In one embodiment, the step of measuring reference signal received power, RSRP, of the cell to be accessed is triggered to be performed in case it is determined that cell measurement is initiated.
In an embodiment, the measuring unit is further configured to measure an RSRP of the serving cell, and obtain an RSRP measurement value of the serving cell; the judging unit is further configured to judge whether to start cell measurement according to the RSRP measurement value of the serving cell and the measurement start parameter; the measurement initiation parameter is carried in a second system message, which is broadcast by the serving cell.
In one embodiment, the preset threshold is determined according to a demodulation capability of a physical layer of the terminal device.
In a third aspect, the present application provides a communication device, comprising a processor, a memory and a communication interface, wherein the processor, the memory and the communication interface are connected to each other, the memory is used for storing a computer program, the computer program comprises program instructions, and the processor is configured to call the program instructions to execute the cell reselection method according to the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon one or more instructions adapted to be loaded by a processor and to perform the cell reselection method of the first aspect.
In the application, if the terminal equipment meets the cell reselection condition, the measured value of the signal-to-noise ratio of the serving cell signal is obtained; judging whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold value or not; and if the measured value of the signal-to-noise ratio is smaller than the preset threshold value, initiating a cell reselection process. By implementing the embodiment of the application, after the existing cell reselection conditions are met, the judgment on the measured value of the signal to noise ratio of the serving cell signal is increased, and the ping-pong reselection condition is favorably avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is an architecture diagram of a communication system according to an embodiment of the present application;
fig. 2 is a flowchart of a cell reselection method according to an embodiment of the present application;
fig. 3 is a flowchart of another cell reselection method according to an embodiment of the present application;
fig. 4 is a flowchart of another cell reselection method according to an embodiment of the present application;
fig. 5 is an overall flowchart of a cell reselection method according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another communication device according to an embodiment of the present application.
Detailed Description
For ease of understanding, terms referred to in the present application will be first introduced.
1. System Information (SI)
The system message is cell-level information, i.e. is valid for all terminal devices accessing the cell. The SI is divided into a main system information block (MIB) and a System Information Block (SIB). The MIB includes a limited number of the most important, most commonly used transmission parameters that require additional information from the cell, while the MIB is transmitted on the Physical Broadcast Channel (PBCH). There are many types of SIB types, where a system information block 1-narrowband (SIB 1-NB) not only carries parameters required for a terminal device to access a cell, but also carries scheduling information of other types of system information blocks. The system information blocks except the SIB1-NB can only be transmitted in the same SI message, but cannot be split and mapped into two different SI messages. Multiple system information blocks with the same scheduling requirements may also be encapsulated into the same SI message for transmission together. The protocol provides that the network device broadcasts the system information block in two different ways: the first is to broadcast SIB1-NB through SIB1 message periods, and the second is to broadcast other SIBs than SIB1 through multiple SI message periods.
2. Reference Signal Receiving Power (RSRP)
The reference signal received power is defined as the linear average of the received power in dBm over the considered measurement frequency bandwidth over the resource elements carrying the reference signal.
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is an architecture diagram of a communication system according to an embodiment of the present application. As shown in fig. 1, the terminal device 101, the first network device 102, and the second network device 103 are included. The terminal device 101 is an entity, such as a mobile phone, on the user side for receiving or transmitting signals. A terminal device may also be referred to as a terminal (terminal), a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc. The terminal device may be a mobile phone (mobile phone), a wearable device, a tablet computer (Pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in a smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in a smart city (smart city), a wireless terminal in a smart home (smart home), a terminal device for supporting enhanced Machine-Type communication (eMTC), Long Term Evolution (LTE) of a universal mobile telecommunications technology, and/or a terminal device for supporting narrowband Internet of Things (NB-IoT), and so on. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.
The first network device 102 is a network device corresponding to a serving cell of the terminal device 101, and the second network device 103 is a network device corresponding to a cell to be accessed. The cell to be accessed is a neighboring cell of the serving cell, and the terminal device may initiate a cell reselection procedure for the cell to be accessed. It should be noted that the number of adjacent cells included in the communication system shown in fig. 1 is only for example and is not limited to the embodiment of the present application. It should be further noted that, the difference between the network devices corresponding to the serving cell and the cell to be accessed shown in fig. 1 is only for example and does not constitute a limitation to the embodiment of the present application. For example, the network devices corresponding to the serving cell and the cell to be accessed in fig. 1 may also be the same network device.
In one implementation, the communication system shown in fig. 1 may also include other cells to be accessed of the serving cell. In fig. 1, an oval area where the first network device 102 is located is a coverage area of a serving cell of the terminal device 101, and an oval area where the second network device 103 is located is a coverage area of a cell to be accessed. The terminal device 101 is simultaneously in the coverage of the serving cell and the cell to be accessed.
A network device (e.g., the first network device 102, the second network device 103) is an entity on the network side for transmitting or receiving signals. The network device may be an evolved node b (eNB), a transmission point (TRP), a next generation base station (gNB) in a New Radio (NR) system of 5G, a base station in another future mobile communication system, or an access node in a wireless fidelity (WiFi) system. The embodiments of the present application do not limit the specific technologies and the specific device forms used by the network devices.
It should be noted that the technical solution of the embodiment of the present application can be applied to the following communication systems: LTE, fifth generation (5G) mobile communication. Optionally, the method of the embodiment of the present application may also be applied to various future communication systems, such as a 6G system or other communication networks.
In a cell reselection method shown in fig. 1, a cell reselection process mainly includes: firstly, if the terminal equipment 101 meets the cell reselection condition, acquiring the measured value of the signal-to-noise ratio of the serving cell signal; the terminal device 101 judges whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold value; and thirdly, if the measured value of the signal to noise ratio is smaller than the preset threshold value, the terminal device 101 initiates a cell reselection process.
By the cell reselection method, when the terminal device 101 meets the existing cell reselection condition, if the measured value of the signal-to-noise ratio of the serving cell signal is smaller than the preset threshold, a cell reselection process is initiated, which is beneficial to avoiding the ping-pong reselection condition.
A cell reselection method provided by the present application is described in detail below.
Referring to fig. 2, fig. 2 is a flowchart illustrating a cell reselection method according to an embodiment of the present disclosure. The cell reselection method may be implemented by the terminal device 101 shown in fig. 1, or may be implemented by a chip in the terminal device 101; as shown in fig. 2, the cell reselection method includes, but is not limited to, the following steps 201 to 203, and the method shown in fig. 2 is described by taking the application to the terminal device 101 as an example.
S201, if the cell reselection condition is met, acquiring a measured value of the signal-to-noise ratio of the serving cell signal.
Specifically, obtaining the measurement value of the signal-to-noise ratio of the serving cell signal refers to obtaining the signal-to-noise ratio of a signal sent by a network device corresponding to the serving cell. It should be noted that the terminal device may always measure the signal-to-noise ratio of a signal sent by a network device corresponding to a serving cell, and in this embodiment of the present application, the measured value of the signal-to-noise ratio of the serving cell signal obtained under the condition that the cell reselection condition is satisfied refers to: the terminal device last measures the signal-to-noise ratio of the signal sent by the network device corresponding to the serving cell, and the obtained result (i.e., the measurement value of the signal-to-noise ratio). The signal sent by the network device corresponding to the serving cell may be a reference signal or a data transmission signal.
The step of judging whether the cell reselection condition is met is as follows: receiving a first system message broadcasted by a service cell, wherein the first system message carries cell reselection parameters; measuring Reference Signal Received Power (RSRP) of a cell to be accessed to obtain an RSRP measurement value of the cell to be accessed; and judging whether the cell reselection condition is met according to the RSRP measurement value of the cell to be accessed and the cell reselection parameter. The cell reselection parameters include: a cell reselection threshold value, a cell reselection time parameter, a cell offset value, a cell reselection hysteresis value, and the like. The first system message may be SIB1-NB, system information block 3-narrowband (SIB 3-narrowband band, SIB3-NB), system information block 4-narrowband (SIB 4-NB), system information block 5-narrowband (SIB 5-NB), etc.
The step of judging whether the cell reselection condition is met according to the RSRP measurement value of the cell to be accessed and the cell reselection parameter is as follows: and when the time of the terminal equipment residing in the service cell exceeds 1S, the S value obtained according to the RSRP measurement value of the cell to be accessed is less than or equal to the cell reselection threshold value, and the R criterion is met in the cell reselection time parameter, the cell reselection condition is determined to be met. And the S value is the RSRP measurement value-the lowest receiving level + the lowest receiving level bias-the power compensation of the cell to be accessed. Wherein, the lowest receiving level is 0-140 dBm, and the lowest receiving level offset and power compensation are 0. The R criterion refers to: the sum of the RSRP measurement value and the cell bias value of the cell to be accessed is larger than the sum of the RSRP measurement value and the cell reselection hysteresis value of the serving cell.
In an implementation manner, if the time for the terminal device to camp on the serving cell does not exceed 1S, an S value obtained according to an RSRP measurement value of the cell to be accessed is greater than a cell reselection threshold value, and/or an R criterion is not satisfied within a cell reselection time parameter, it is determined that the cell reselection condition is not satisfied.
And under the condition that the cell measurement is determined to be started, the terminal equipment triggers and executes the step of measuring the Reference Signal Received Power (RSRP) of the cell to be accessed. The step of determining whether to initiate cell measurement is: measuring the RSRP of the serving cell to obtain the RSRP measurement value of the serving cell; judging whether cell measurement is started or not according to the RSRP measurement value of the serving cell and the measurement starting parameter; the measurement initiation parameter is carried in a second system message, which is broadcast by the serving cell. Judging whether cell measurement is started or not according to the RSRP measurement value and the measurement starting parameter of the serving cell specifically comprises the following steps: and obtaining an S value according to the RSRP measurement value of the serving cell, and determining to start cell measurement if the S value is less than or equal to the measurement starting parameter. Wherein, the second system message may be: SIB1-NB, SIB3-NB, etc.
S202, judging whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold value.
The preset threshold may be determined according to a demodulation capability of a physical layer of the terminal device. For example, it may be determined by the terminal device itself according to the demodulation capability of the physical layer of the terminal device. Or, the terminal device may report the demodulation capability of its physical layer to the network device, and then the network device determines the preset threshold according to the demodulation capability of the physical layer of the terminal device. And the network equipment is corresponding to the service cell of the terminal equipment.
S203, if the measured value of the signal-to-noise ratio is smaller than a preset threshold value, initiating a cell reselection process.
If the measured value of the signal-to-noise ratio is smaller than the preset threshold, the error rate of the terminal device in signal demodulation is high, which affects the normal operation of the uplink and downlink services of the terminal device, and therefore cell reselection is required. The initiating of the cell reselection procedure described in the embodiment of the present application refers to a cell reselection procedure initiated for a cell to be accessed.
In the prior art, cell reselection only refers to RSRP measurement values of a serving cell and a cell to be accessed. When the terminal device is located at the cell edge, there may be a situation where the RSRP measurement values of multiple cells are approximate, which may cause the terminal device to repeatedly reselect among multiple cells, i.e., may cause ping-pong reselection. The cell data transmission quality is not only related to RSRP but also to the signal-to-noise ratio of the cell signal. Therefore, after the existing cell reselection condition is met, the condition whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than the preset threshold is added, and if the measured value of the signal-to-noise ratio of the serving cell signal is smaller than the preset threshold, that is, the serving cell is a non-high quality cell, the normal operation of the service is affected, and a cell reselection process can be initiated. After the existing cell reselection condition is met, the condition whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than the preset threshold value is increased, so that the ping-pong reselection condition can be avoided.
Referring to fig. 3, fig. 3 is a flowchart of another cell reselection method provided in this embodiment, where the cell reselection method shown in fig. 3 may be implemented by the terminal device 101 shown in fig. 1, or may be implemented by a chip in the terminal device 101; as shown in fig. 3, the cell reselection method includes, but is not limited to, the following steps 301 to 305:
s301, if the cell reselection condition is met, acquiring a measured value of the signal-to-noise ratio of the serving cell signal.
S302, whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold value is judged.
It should be noted that, the execution processes of steps S301 to S302 may refer to the specific descriptions in steps S201 to S202 in fig. 2, and are not described herein again.
S303, measuring the signal-to-noise ratio of the cell signal to be accessed.
And measuring the signal to noise ratio of the signal of the cell to be accessed, namely measuring the signal to noise ratio of the reference signal sent by the network equipment corresponding to the cell to be accessed.
S304, judging whether the measured value of the signal-to-noise ratio of the cell signal to be accessed is smaller than a preset threshold value.
The process of determining whether the measured value of the signal-to-noise ratio of the signal of the cell to be accessed is smaller than the preset threshold is the same as the process of determining whether the measured value of the signal-to-noise ratio of the signal of the serving cell is smaller than the preset threshold, and the difference is that the cell to be accessed becomes the serving cell. Therefore, the execution process of step S304 can refer to the detailed description in step S202 in fig. 2, and is not described herein again.
S305, if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to a preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is greater than or equal to the preset threshold value, initiating a cell reselection process.
If the measured values of the signal-to-noise ratios of the signals of the serving cell and the cell to be accessed are greater than or equal to the preset threshold value, the serving cell and the cell to be accessed can be considered as high-quality cells, and good service experience can be provided. The serving cell satisfies the cell reselection condition, which indicates that the signal quality of the serving cell is poor, so that the terminal device initiates a cell reselection process to reselect to a high-quality cell to be accessed, thereby facilitating the normal operation of the terminal device.
In the above embodiment, after the terminal device meets the cell reselection condition, a condition whether the measured value of the signal-to-noise ratio of the signals of the serving cell and the cell to be accessed is smaller than a preset threshold is added, so that the ping-pong reselection condition can be avoided, and power consumption can be reduced.
Referring to fig. 4, fig. 4 is a flowchart of another cell reselection method provided in this embodiment, where the cell reselection method shown in fig. 4 may be implemented by the terminal device 101 shown in fig. 1, or may be implemented by a chip in the terminal device 101; as shown in fig. 4, the cell reselection method includes, but is not limited to, the following steps 401 to 405:
s401, if the cell reselection condition is met, acquiring a measured value of a signal-to-noise ratio of a serving cell signal;
s402, judging whether the measured value of the signal-to-noise ratio of the signal of the service cell is smaller than a preset threshold value;
s403, measuring the signal-to-noise ratio of the cell signal to be accessed;
s404, judging whether the measured value of the signal-to-noise ratio of the signal of the cell to be accessed is smaller than a preset threshold value;
it should be noted that the execution processes of steps S401 to S402 may refer to the specific descriptions in steps S201 to S202 in fig. 2, and the execution processes of steps S403 to S404 may refer to the specific descriptions in steps S303 to S304 in fig. 3, which are not described herein again.
S405, if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to a preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is less than the preset threshold value, the cell signal to be accessed resides in the serving cell.
The measured value of the signal-to-noise ratio of the signal of the cell to be accessed is smaller than the preset threshold value, that is, the cell to be accessed is a non-high quality cell, and the service experience may be poor. The measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold, that is, the serving cell is a high-quality cell, and the terminal device may consider that although the signal quality of the serving cell is poor, the normal operation of the service is not affected, and thus the terminal device resides in the serving cell. When the measured value of the signal-to-noise ratio of the signal of the cell to be accessed is smaller than the preset threshold, if the terminal device is switched to the cell to be accessed, the service of the terminal device is affected.
In the above embodiment, after the terminal device meets the cell reselection condition, a condition whether the measured value of the signal-to-noise ratio of the signals of the serving cell and the cell to be accessed is smaller than a preset threshold is added, so that the ping-pong reselection condition can be avoided, and power consumption can be reduced.
Referring to fig. 5, fig. 5 is a flowchart of a cell reselection method according to an embodiment of the present disclosure, where the cell reselection method shown in fig. 5 may be implemented by the terminal device 101 shown in fig. 1, or may be implemented by a chip in the terminal device 101; as shown in fig. 5, the cell reselection method includes, but is not limited to, the following steps S501 to S505:
s501, if the cell reselection condition is met, acquiring a measured value of the signal-to-noise ratio of the serving cell signal.
S502, judging whether the measured value of the signal-to-noise ratio of the service cell signal is smaller than a preset threshold value.
And S503, if the measured value of the signal-to-noise ratio is smaller than a preset threshold value, initiating a cell reselection process.
It should be noted that, the execution process of steps S501 to S503 can refer to the specific description in steps S201 to S203 in fig. 2, and is not described herein again.
S504, if the measured value of the signal-to-noise ratio is larger than or equal to the preset threshold value, the signal-to-noise ratio of the signal of the cell to be accessed is measured.
And S505, judging whether the measured value of the signal-to-noise ratio of the cell signal to be accessed is smaller than a preset threshold value.
S506, if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is greater than or equal to the preset threshold value, initiating a cell reselection process.
It should be noted that, the execution process of steps S504 to S506 may refer to the specific description in steps S303 to S305 in fig. 3, and is not described herein again.
And S507, if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to a preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is less than the preset threshold value, the cell signal to be accessed resides in the serving cell.
It should be noted that, the execution process of step S507 may refer to the specific description in step S405 in fig. 4, and is not described herein again.
In the above embodiment, after the terminal device meets the cell reselection condition, a condition whether the measured value of the signal-to-noise ratio of the signals of the serving cell and the cell to be accessed is smaller than a preset threshold is added, so that the ping-pong reselection condition can be avoided, and power consumption can be reduced.
While the method of the embodiments of the present application has been described in detail above, to facilitate better implementation of the above-described aspects of the embodiments of the present application, the apparatus of the embodiments of the present application is provided below accordingly.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure, and the communication device shown in fig. 6 may be used to perform part or all of the functions in the method embodiments described in fig. 2 to fig. 5. The detailed description of each unit is as follows:
an obtaining unit 601, configured to obtain a measured value of a signal-to-noise ratio of a serving cell signal if a cell reselection condition is met.
The determining unit 602 is configured to determine whether a measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold.
The processing unit 603 is configured to initiate a cell reselection procedure if the measured value of the signal-to-noise ratio is smaller than a preset threshold.
In an embodiment, the communication apparatus further includes: a measuring unit 604, configured to measure a signal-to-noise ratio of a signal of a cell to be accessed. The determining unit 602 is further configured to determine whether a measured value of the signal-to-noise ratio of the signal of the cell to be accessed is smaller than a preset threshold. The processing unit 603 is further configured to initiate a cell reselection procedure if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to a preset threshold, and the measured value of the signal-to-noise ratio of the to-be-accessed cell signal is greater than or equal to a preset threshold.
In an embodiment, the processing unit 603 is further configured to camp on the serving cell if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold and the measured value of the signal-to-noise ratio of the to-be-accessed cell signal is less than the preset threshold.
In an embodiment, the communication apparatus further includes: a receiving unit 605, configured to receive a first system message broadcasted by a serving cell, where the first system message carries a cell reselection parameter; the measuring unit 604 is further configured to measure a reference signal received power RSRP of the cell to be accessed, so as to obtain an RSRP measurement value of the cell to be accessed; the determining unit 602 is further configured to determine whether a cell reselection condition is met according to the RSRP measurement value of the cell to be accessed and the cell reselection parameter.
In an embodiment, the communication apparatus further includes: and under the condition that the cell measurement is determined to be started, triggering and executing the step of measuring the Reference Signal Received Power (RSRP) of the cell to be accessed.
In an embodiment, the communication apparatus further includes: the measuring unit 604 is further configured to measure an RSRP of the serving cell to obtain an RSRP measurement value of the serving cell; the determining unit 602 is further configured to determine whether to start cell measurement according to the RSRP measurement value of the serving cell and the measurement start parameter; the measurement initiation parameter is carried in a second system message, which is broadcast by the serving cell.
In one embodiment, the preset threshold is determined according to the demodulation capability of the physical layer of the terminal device.
The embodiments of the present invention and the embodiments of the methods shown in fig. 2 to 5 are based on the same concept, and the technical effects thereof are also the same, and for the specific principle, reference is made to the description of the embodiments shown in fig. 2 to 5, which is not repeated herein.
According to an embodiment of the present application, the units in the communication apparatus shown in fig. 6 may be respectively or entirely combined into one or several other units to form the unit, or some unit(s) therein may be further split into multiple units with smaller functions to form the unit(s), which may achieve the same operation without affecting the achievement of the technical effect of the embodiment of the present application. The units are divided based on logic functions, and in practical application, the functions of one unit can be realized by a plurality of units, or the functions of a plurality of units can be realized by one unit. In other embodiments of the present application, the communication device may also include other units, and in practical applications, the functions may also be implemented by being assisted by other units, and may be implemented by cooperation of a plurality of units.
According to the communication device, after the terminal equipment meets the existing cell reselection conditions, the condition whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than the preset threshold value is increased, the ping-pong reselection condition can be avoided, and the reduction of power consumption is facilitated.
Based on the description of the method embodiment and the device embodiment, the embodiment of the application also provides a communication device. Referring to fig. 7, the communication device at least includes a communication interface 701, a processor 702 and a memory 703. The communication interface 701, the processor 702, and the memory 703 may be connected by a bus 704 or by other means. The bus lines are shown in fig. 7 by thick lines, and the connection manner between other components is merely illustrative and not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.
In embodiments of the present application, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface for communicating with other devices over a transmission medium. For example, the communication interface 701 is used in a communication apparatus so that the communication apparatus can communicate with other devices. The processor 702 is configured to send and receive data using the communication interface 701 and is configured to implement the methods of the above-described method embodiments. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. In the embodiment of the present application, the specific connection medium among the communication interface 701, the processor 702, and the memory 703 is not limited.
The Processor 702 may be a Central Processing Unit (CPU), and the Processor 702 may also be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general-purpose processor may be a microprocessor, but in the alternative, the processor 702 may be any conventional processor or the like. Wherein:
a memory 703 for storing program instructions.
A processor 702 for invoking program instructions stored in memory 703 for:
if the cell reselection condition is met, acquiring a measured value of the signal-to-noise ratio of a serving cell signal;
judging whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold value or not;
and if the measured value of the signal-to-noise ratio is smaller than a preset threshold value, initiating a cell reselection process.
In one embodiment, the processor 702 is further configured to: measuring the signal-to-noise ratio of a cell signal to be accessed; judging whether the measured value of the signal-to-noise ratio of the signal of the cell to be accessed is smaller than a preset threshold value or not; and if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is greater than or equal to the preset threshold value, initiating a cell reselection process.
In one embodiment, the processor 702 is further configured to: and if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is less than the preset threshold value, the cell signal to be accessed resides in the serving cell.
In one embodiment, the communication interface 701 is further configured to: and receiving a first system message broadcasted by the service cell, wherein the first system message carries cell reselection parameters.
In one embodiment, the processor 702 is further configured to: measuring Reference Signal Received Power (RSRP) of a cell to be accessed to obtain an RSRP measurement value of the cell to be accessed; and judging whether the cell reselection condition is met according to the RSRP measurement value of the cell to be accessed and the cell reselection parameter.
In one embodiment, the processor 702 is further configured to: and under the condition that the cell measurement is determined to be started, triggering and executing the step of measuring the Reference Signal Received Power (RSRP) of the cell to be accessed.
In one embodiment, the processor 702 is further configured to: measuring the RSRP of the serving cell to obtain the RSRP measurement value of the serving cell; judging whether cell measurement is started or not according to the RSRP measurement value of the serving cell and the measurement starting parameter; the measurement initiation parameter is carried in a second system message, which is broadcast by the serving cell.
In one embodiment, the preset threshold is determined according to a demodulation capability of a physical layer of the terminal device.
According to another embodiment of the present application, the communication apparatus as shown in fig. 6-7 may be constructed by running a computer program (including program code) capable of executing the steps involved in the respective methods as shown in fig. 2-5 on a general-purpose computing apparatus, such as a computer, including a Central Processing Unit (CPU), a random access storage medium (RAM), a read-only storage medium (ROM), etc., and a storage element, and implementing the cell reselection method of the embodiments of the present application. The computer program may be recorded on, for example, a computer-readable recording medium, loaded into the above-described communication apparatus via the computer-readable recording medium, and executed therein.
Based on the same inventive concept, the principle and the advantageous effect of the communication apparatus to solve the problem provided in the embodiment of the present application are similar to the principle and the advantageous effect of the communication apparatus to solve the problem in the embodiment of the method of the present application, and for brevity, the principle and the advantageous effect of the implementation of the method may be referred to, and are not described herein again.
The embodiment of the present application further provides a computer-readable storage medium, where one or more instructions are stored in the computer-readable storage medium, and the one or more instructions are adapted to be loaded by a processor and to execute the cell reselection method according to the foregoing method embodiment.
Embodiments of the present application also provide a computer program product containing instructions, which when run on a computer, cause the computer to perform the cell reselection method of the above method embodiments.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs. The modules in the device can be merged, divided and deleted according to actual needs.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, which may include: flash disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A cell reselection method is applied to a terminal device, and comprises the following steps:
if the cell reselection condition is met, acquiring a measured value of the signal-to-noise ratio of a serving cell signal;
judging whether the measured value of the signal-to-noise ratio of the serving cell signal is smaller than a preset threshold value or not;
and if the measured value of the signal-to-noise ratio is smaller than the preset threshold value, initiating a cell reselection process.
2. The method of claim 1, further comprising:
measuring the signal-to-noise ratio of a cell signal to be accessed;
judging whether the measured value of the signal-to-noise ratio of the signal of the cell to be accessed is smaller than the preset threshold value or not;
and if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is greater than or equal to the preset threshold value, initiating a cell reselection process.
3. The method of claim 1, further comprising:
and if the measured value of the signal-to-noise ratio of the serving cell signal is greater than or equal to the preset threshold value and the measured value of the signal-to-noise ratio of the cell signal to be accessed is less than the preset threshold value, the cell signal to be accessed resides in the serving cell.
4. The method of claim 1, further comprising:
receiving a first system message broadcasted by the serving cell, wherein the first system message carries cell reselection parameters;
measuring Reference Signal Received Power (RSRP) of a cell to be accessed to obtain an RSRP measurement value of the cell to be accessed;
and judging whether the cell reselection condition is met according to the RSRP measurement value of the cell to be accessed and the cell reselection parameter.
5. The method of claim 4, further comprising:
and under the condition that the cell measurement is determined to be started, triggering and executing the step of measuring the Reference Signal Received Power (RSRP) of the cell to be accessed.
6. The method of claim 5, further comprising:
measuring the RSRP of the serving cell to obtain an RSRP measurement value of the serving cell;
judging whether cell measurement is started or not according to the RSRP measurement value of the serving cell and the measurement starting parameter; the measurement initiation parameter is carried in a second system message, which is broadcast by the serving cell.
7. The method according to any one of claims 1 to 6, wherein the preset threshold is determined according to a demodulation capability of a physical layer of the terminal device.
8. A cell reselection apparatus comprising means for performing the method of any of claims 1-7.
9. A cell reselection apparatus comprising a processor, a memory and a communication interface, said processor, said memory and said communication interface being interconnected, wherein said memory is configured to store a computer program, said computer program comprising program instructions, said processor being configured to invoke said program instructions to perform the method of any of claims 1 to 7.
10. A computer-readable storage medium having stored thereon one or more instructions adapted to be loaded by a processor and to perform the method of any of claims 1-7.
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