CN112399514A - Cell switching method, terminal and computer readable storage medium - Google Patents
Cell switching method, terminal and computer readable storage medium Download PDFInfo
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- CN112399514A CN112399514A CN202011241703.5A CN202011241703A CN112399514A CN 112399514 A CN112399514 A CN 112399514A CN 202011241703 A CN202011241703 A CN 202011241703A CN 112399514 A CN112399514 A CN 112399514A
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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
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
The application provides a cell switching method, a terminal and a computer readable storage medium; the method comprises the following steps: reporting a measurement event to a first network device under the condition that a wireless resource control connection is established with a network device corresponding to a currently accessed service cell; if the measurement event is an adjacent cell measurement event, and the quality of the signal of the adjacent cell represented by the adjacent cell measurement event is higher than that of the serving cell, triggering the radio resource control connection reconnection to perform cell reselection when a connection reselection condition is met under the condition that a switching instruction returned by the network equipment for the adjacent cell measurement event is not received. By the method and the device, the network quality of the terminal can be improved.
Description
Technical Field
The present application relates to communications technologies, and in particular, to a cell switching method, a terminal, and a computer-readable storage medium.
Background
The inter-cell handover of a mobile communication system means that a mobile terminal completes the transition of radio link connection from a source cell to a target cell under the control of a radio access network, and is a basic technical means for ensuring seamless mobile communication service. According to the protocol, a cell change can be triggered only by network handover in a Radio Resource Control (RRC) connected state of Long Term Evolution (LTE) technology. In the related art, the handover is usually performed according to an air interface signaling of a network side, which depends on the neighboring cell configuration of the base station, and if the neighboring cell configuration threshold is too high, the serving cell signal may be weakened, but the network does not trigger the handover, and the terminal may be in a weak signal for a long time, thereby affecting the network quality.
Disclosure of Invention
The embodiment of the application provides a cell switching method, a terminal and a computer readable storage medium, which can improve the network quality of the terminal.
The technical scheme of the embodiment of the application is realized as follows:
the embodiment of the application provides a cell switching method, which comprises the following steps: under the condition that a first network device corresponding to a currently accessed service cell establishes a radio resource control connection, reporting a measurement event to the first network device; if the measurement event is an adjacent cell measurement event, and the quality of the signal of the adjacent cell represented by the adjacent cell measurement event is higher than that of the serving cell, triggering radio resource control connection reconnection to perform cell reselection when a connection reselection condition is met under the condition that a switching instruction returned by the first network device for the adjacent cell measurement event is not received.
An embodiment of the present application provides a terminal, including: a sending module, configured to report a measurement event to a first network device corresponding to a currently accessed serving cell when the first network device establishes a radio resource control connection; and if the measurement event is an adjacent cell measurement event, and the adjacent cell measurement event indicates that the signal quality of the adjacent cell is higher than that of the serving cell, triggering radio resource control connection reconnection when a connection reselection condition is met and performing cell reselection under the condition that a switching instruction returned by the first network device for the adjacent cell measurement event is not received.
An embodiment of the present application provides a terminal, including:
a receiver, a transmitter, a memory, and a processor;
the memory is used for storing executable instructions, data received by the receiver and data required to be transmitted by the transmitter; the receiver, the transmitter, and the memory rely on the processor to perform operations over a communication bus; the processor is configured to implement the cell handover method according to the embodiment of the present application when the executable instruction is executed.
An embodiment of the present application provides a computer-readable storage medium, which stores executable instructions for causing a processor to execute the computer-readable storage medium to implement the cell handover method provided in the embodiment of the present application.
The embodiment of the application has the following beneficial effects: according to the technical scheme, when the terminal does not receive the switching instruction of the network equipment and the terminal determines that the connection reselection condition is met, the wireless resource control connection reconnection is carried out so as to switch from the current serving cell to the adjacent cell; the method and the device realize that the terminal can be actively switched to the target cell when the cell switching requirement exists, improve the timeliness of cell switching compared with the method of executing cell switching according to a switching instruction issued by a base station, and enable the terminal to be timely switched to the target cell with better signal quality, thereby improving the network quality of the terminal.
Drawings
Fig. 1 is a schematic diagram of an alternative architecture of a communication system provided in an embodiment of the present application;
fig. 2 is an alternative flowchart of a cell handover method according to an embodiment of the present application;
fig. 3 is an alternative flowchart of a cell handover method according to an embodiment of the present application;
fig. 4 is an alternative flowchart of a cell handover method according to an embodiment of the present application;
fig. 5 is an alternative flowchart of a cell handover method according to an embodiment of the present application;
fig. 6 is an alternative flowchart of a cell handover method according to an embodiment of the present application;
fig. 7 is an alternative flowchart of a cell handover method according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a terminal provided in an embodiment of the present application;
fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present application.
Detailed Description
In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the attached drawings, the described embodiments should not be considered as limiting the present application, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
In the following description, references to the terms "first \ second \ third" are only to distinguish similar objects and do not denote a particular order, but rather the terms "first \ second \ third" are used to interchange specific orders or sequences, where appropriate, so as to enable the embodiments of the application described herein to be practiced in other than the order shown or described herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.
Before further detailed description of the embodiments of the present application, terms and expressions referred to in the embodiments of the present application will be described, and the terms and expressions referred to in the embodiments of the present application will be used for the following explanation.
Before further detailed description of the embodiments of the present application, terms and expressions referred to in the embodiments of the present application will be described, and the terms and expressions referred to in the embodiments of the present application will be used for the following explanation.
1) Radio Resource Control (RRC): also known as radio resource management or radio resource allocation. Radio resource management mainly refers to utilization of air interface resources such as frequency resources, time slot resources, power resources, code resources and space resources. The RRC protocol can be classified into the following 6 procedures in connection control: (1) and (3) paging process: the network sends out paging message to UE of RRC protocol idle mode in the cell, triggers the process that UE establishes SRB 1; (2) RRC connection establishment procedure: a procedure of establishing SRB1 between the UE and the eNodeB; (3) the security activation process comprises the following steps: after the SRB1 is established, the eNodeB activates and configures the ciphering algorithm and integrity protection of the UE; (4) RRC connection configuration procedure: is a process of managing the eNodeB, and can also trigger the UE to perform handover; (5) RRC connection reestablishment process: after the radio link is in a problem or the handover fails, the UE re-initiates the process of establishing the SRB 1; (6) and (3) a release process: and (4) switching the UE to the idle mode after releasing all RBs related to the eNodeB.
The RRC protocol states mainly have two states: an idle state and a connected state. The IDLE state (RRC _ IDLE) includes two sub-states: (1) NULL (NULL state): the network end is in an empty state when just starting up; or the network end automatically jumps to the empty state after irreparable errors such as failure of a bottom link occur. (2) IDL (idle state): when the network side is in an idle state, the system information can be encoded and the MAC sublayer is configured to broadcast the system information, so that the UE can obtain the current system information in real time. In idle state, the RRC may also configure the UE to perform channel measurement, so that the network may monitor the channel quality in real time and configure the UE to camp in a more suitable cell. The CONNECTED state (RRC _ CONNECTED) includes three different states: (1) ACC (random access state): the random access is initiated by the UE, and the random access state is the configuration of wireless resources and wireless channels when the UE receives a connection establishment request message configured by the self high layer. In the process of random access, firstly, uplink synchronization needs to be established through MAC, and the higher layer is notified to establish RRC connection, so as to establish SRB 1. (2) CON (connection state): i.e., normal connection state, which is called connection state during the whole process of the call, in this state, the SRB2 and the DRBS need to be established to complete the establishment of the radio link, and communication can be performed only after the establishment. (3) HO (handover): the current service cell is switched to another cell, the cells with the same frequency and different frequencies can be used, and in the process, the network terminal can perform corresponding operation according to the behavior of the terminal.
2) An LTE network: LTE is an evolution of 3G, a transition between 3G and 4G technologies, a global standard for 3.9G, improves and enhances 3G over-the-air access technologies, and adopts OFDM and MIMO as the only standards for its wireless network evolution. The peak rates of 326Mbit/s at the downlink and 86Mbit/s at the uplink can be provided under the 20MHz spectrum bandwidth. The performance of cell edge users is improved, the cell capacity is increased, and the system delay is reduced.
3) And (3) adjacent cells: also called neighbor cell, is the target cell when the terminal is switched.
When a terminal performs cell switching, a cell is replaced in an LTE RRC connected state according to a protocol and can only be triggered by network switching, namely, the terminal can only execute switching according to an air interface signaling issued by a network side, the issue of the air interface signaling depends on the adjacent cell configuration of a base station, if the adjacent cell configuration switching threshold of the base station is too high or the adjacent cell configuration switching function is not equipped, but a service cell signal of the terminal is weakened, even if the terminal reports an adjacent cell measurement event, but the base station does not trigger adjacent cell switching, the terminal can be in a weak signal for a long time, so that the communication quality is influenced, and the user experience is influenced.
The embodiment of the application provides a cell switching method, terminal equipment and a computer readable storage medium, which can enable a terminal to be switched to a target cell with better signal quality in time, so that the network quality of the terminal can be improved. An exemplary application of the terminal provided by the embodiment of the present application is described below, and the terminal provided by the embodiment of the present application can be implemented as various types of user terminals such as a notebook computer, a tablet computer, a desktop computer, a set-top box, a mobile device (e.g., a mobile phone, a portable music player, a personal digital assistant, a dedicated messaging device, a portable game device), and the like. In the following, an exemplary application will be explained when the device is implemented as a terminal.
Referring to fig. 1, fig. 1 is a schematic diagram of an alternative architecture of a communication system according to an embodiment of the present application. As shown, the communication system may include: a terminal 101 and a first network device 102.
The terminal 101 may include various types of user terminal handheld devices (e.g., Mobile phones, portable music players, personal digital assistants, dedicated messaging devices, portable gaming devices), in-vehicle devices, wearable devices (e.g., smartwatches, smartbands, etc.), computing devices (e.g., laptop, tablet, and desktop computers, etc.) or other processing devices connected to wireless modems, as well as various forms of user equipment, Mobile Stations (MSs), and so forth, having wireless communication capabilities. For convenience of description, the above-mentioned devices are collectively referred to as a terminal. The first network device 102 and the terminal 101 communicate with each other through some air interface technology, for example, a Uu interface.
The first network device 102 may be an evolved node b (eNB), an Access Point (AP), or a relay station in a long term evolution LTE system, or may be a base station (e.g., a gNB or a Transmission Point (TRP)) in a 5G system, and in a 5G NR-U system, a device having a base station function is referred to as a nodeb or a gNB. The description of "base station" may change as communication technology evolves. The first Network device 102 may also be a wireless controller in a Cloud Radio Access Network (CRAN), a Mobile switching center, a relay station, an Access Point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router or a Network device in a future communication System, a Base station in an NTN System such as a gNB or a transmission Point (TRP), a Global System for Mobile communication (GSM) System or a Base station (Base transceiver station, BTS) in a Code Division Multiple Access (CDMA) System, a Base station (NodeB, NB) in a Wideband Code Division Multiple Access (Wideband C Division Multiple Access, WCDMA) System, and the like, and the embodiment of the present application is not limited thereto.
In addition, in the embodiment of the present application, the first network device 102 serves different cells, and the terminal 101 and the first network device 102 use transmission resources (e.g., frequency domain resources or spectrum resources) through a cell corresponding to the first network device 102 (e.g., a base station). The cell may belong to a macro base station, or may belong to a base station corresponding to a small cell (small cell), where the small cell may include: urban cell (etro cell), Micro cell (Micro cell), Pico cell (Pico cell), femto cell (Fe femto cell), etc., these small cells have the characteristics that the coverage is small, the transmission power is low, are suitable for providing the data transmission service of high speed. In addition, the cell may also be a super cell (supercell).
In the embodiment of the present application, multiple cells may simultaneously operate at the same frequency on a carrier in an LTE system or an NR system, and under some special scenarios, the concepts of the carrier and the cell may also be considered to be equivalent. For example, in a Carrier Aggregation (CA) scenario, when a secondary Carrier is configured for a UE, a Carrier index of the secondary Carrier and a Cell identity (Cell identity, Cell ID) of a secondary Cell operating on the secondary Carrier are carried at the same time, and in this case, the Carrier and the Cell may be considered to be equivalent in concept, for example, it is equivalent that the UE accesses one Carrier and one Cell.
The cell handover method provided by the present application is implemented based on the architecture of the communication system shown in fig. 1.
Referring to fig. 2, fig. 2 is an alternative flowchart of a cell handover method provided in the embodiment of the present application, and will be described with reference to the steps shown in fig. 2.
S101, reporting a measurement event to a first network device under the condition that the first network device corresponding to the currently accessed service cell establishes a radio resource control connection.
In an embodiment of the present application, a terminal selects a cell (hereinafter referred to as a serving cell) corresponding to a first network, and after the cell is camped, performs RRC connection establishment with a first network device, and when the RRC establishment is successful (in an RRC connected state), the first network device sends a measurement configuration message to the terminal, where the measurement configuration message includes a measurement indicator, for example, an RSRP value and/or an RSRQ value, and related parameters that trigger reporting, and the like. The terminal measures signal strength values such as RSRP and/or RSRQ of an adjacent cell at a preset frequency based on the received measurement configuration message, judges whether the obtained measurement value meets related parameters triggering reporting, and reports a measurement event to the first network equipment when the obtained measurement value meets the related parameters triggering reporting; and when one measurement and reporting are finished, or after one measurement is finished, continuing to measure according to the preset frequency.
S102, if the measurement event is an adjacent cell measurement event, and the quality of a signal of the adjacent cell represented by the adjacent cell measurement event is higher than that of a serving cell, triggering wireless resource control connection reconnection when a connection reselection condition is met under the condition that a switching instruction returned by the first network device for the adjacent cell measurement event is not received, and performing cell reselection.
In the embodiment of the application, the measurement event reported by the terminal to the first network device includes multiple different types of events, and the first network device determines whether the terminal needs to be controlled to perform handover or not according to the reported neighbor cell measurement event, and sends a handover instruction to the terminal when determining that the terminal needs to be controlled to perform handover. After reporting the measurement event, the terminal determines whether the reported time belongs to the adjacent cell measurement event representing that the signal quality of the adjacent cell is higher than that of the serving cell, and waits for a switching instruction returned by the first network equipment when determining that the measurement event belongs to the adjacent cell measurement event; if the switching instruction of the first network equipment is not received, the terminal determines whether the connection reselection condition is met, and when the connection reselection condition is met, the terminal triggers RRC reconnection to reselect the cell so as to access other cells.
In an embodiment of the present application, the measurement event reported by the terminal may include the following types of measurement events:
a1: the source cell is better than a certain threshold; this event can be used to turn off measurements for certain cells;
a2: the source cell is worse than a certain threshold; this event may be used to start measurements for certain cells, since a handover or the like may occur after this event;
a3: the neighbor cell is better than the source cell by a certain threshold;
a4: the neighbor cell is better than a certain threshold;
a5: the source cell is worse than a certain threshold and the neighbor cell is better than a certain threshold;
b1: the quality of the adjacent area of the different system is higher than a certain threshold;
b2: the quality of the source cell is lower than a certain threshold and the quality of the adjacent cell of the different system is higher than a certain threshold.
In some embodiments of the present application, the events A3, a4, and a5 belong to neighboring cell events, and if a measurement event reported by the terminal is A3, a4, or a5, the terminal triggers radio resource control connection reconnection to perform cell reselection when a connection reselection condition is met without receiving a handover instruction returned by the first network device for the event A3, a4, or a 5.
In some embodiments of the present application, when determining that the measurement event belongs to a measurement event of a neighboring cell, the terminal may set a timer to count, and start to wait for a switching instruction returned by the first network device, and if the switching instruction returned by the first network device is not received before the timer is ended, consider that the switching instruction sent by the first network device is not received. The timing time may be set arbitrarily, for example, may be 30ms or 20ms, and the like, which is not limited in this embodiment of the application.
In some embodiments of the present application, the reselection condition may be: whether the signal strength of the serving cell recorded in the reported neighbor cell measurement event is lower than a preset value, for example, lower than-120 dBm. Therefore, when the terminal determines that the measurement event belongs to the measurement event of the adjacent cell, does not receive the switching instruction returned by the first network equipment, and determines that the signal strength of the serving cell recorded by the reported adjacent cell event is lower than-120 d Bm, the terminal triggers RRC reconnection to reselect the cell so as to access other cells.
In some embodiments of the present application, the neighboring cells include multiple cells, and the terminal triggers RRC reconnection to perform cell reselection, which may be implemented through steps S1-S2:
s1, determining a target cell from the neighbor cells according to the neighbor cell measurement event; the target cell is the cell with the highest signal quality in the adjacent cells.
In the embodiment of the present application, the terminal may rank the corresponding multiple cells according to the measured signal strength of each cell included in the measurement event of the neighboring cell, and select the cell with the highest signal quality as the target cell according to the ranking result. The target cell may be a cell corresponding to the first network device and different from the serving cell, or may be a cell corresponding to a second network device different from the first network device. The second network device may be the same as or different from the first network device in device type, as long as the second network device can provide network service for the terminal, which is not limited in this embodiment of the application.
S2, disconnecting the radio resource control connection with the first network device, and reestablishing the RRC connection with the second network device corresponding to the target cell, so as to access the target cell.
In the embodiment of the application, after the target cell is determined, the terminal disconnects the RRC connection with the first network device, reestablishes the RRC connection with the second network device corresponding to the target cell, recovers the bearer, and implements cell handover in a connected state.
In the embodiment of the application, when the terminal does not receive the switching instruction of the first network device and determines that the connection reselection condition is met, the terminal performs radio resource control connection reconnection so as to switch from the current serving cell to the adjacent cell with a strong signal; the method and the device realize that the terminal can be actively switched to the target cell when the cell switching requirement exists, improve the timeliness of cell switching compared with the method of executing cell switching according to a switching instruction issued by a base station, and enable the terminal to be timely switched to the target cell with better signal quality, thereby improving the network quality of the terminal.
In some embodiments, before triggering the rrc connection reconnection to perform the cell reselection, the terminal further determines whether a call service exists, and in the absence of the call service, triggers the rrc connection reconnection to perform the cell reselection.
In some embodiments of the present application, before reporting the measurement event, the terminal may determine whether a call service exists, and report the measurement event when the call service does not exist, and when the call service exists, the terminal may perform discontinuous or non-discontinuous detection at a preset frequency, and report the measurement event after detecting that the call service is ended.
In other embodiments of the present application, when a terminal does not receive a handover instruction returned by a first network device for an adjacent cell measurement event, after a connection reselection condition is satisfied, and before triggering rrc connection reconnection and performing cell reselection, it may determine whether a call service exists, and when a call service does not exist, trigger rrc connection reconnection and perform cell reselection, and when a call service exists, the terminal may perform discontinuous or discontinuous detection at a preset frequency, and after detecting that a call service ends, trigger rrc connection reconnection and perform cell reselection; therefore, the situation of forced cell switching can not occur under the condition that the call service exists in the terminal, so that the call service of the terminal can be normally carried out.
Exemplarily, fig. 3 is an optional flowchart of the method provided in the embodiment of the present application, and based on fig. 2, S102 may be implemented by S201 to S203:
s201, if the measurement event is an adjacent cell measurement event, and the quality of a signal of the adjacent cell represented by the adjacent cell measurement event is higher than that of a serving cell, determining whether a call service exists when a connection reselection condition is met under the condition that a switching instruction returned by the first network device for the adjacent cell measurement event is not received.
S202, under the condition that no conversation service exists, the wireless resource control connection reconnection is triggered to perform cell reselection.
And S203, returning to the step S201 to continuously determine whether the call service exists or not under the condition that the call service exists.
In some embodiments of the present application, the neighbor cell measurement event comprises: a first signal strength of a serving cell and a second signal strength of a neighbor cell; the connection reselection conditions include: the triggering times are more than or equal to the preset times.
Fig. 4 is an optional flowchart of the method provided in the embodiment of the present application, based on fig. 2, after S101 and before S102, S301 to S308 may be executed, and S201 may be implemented by S2011:
s301, determining whether a switching instruction returned by the first network equipment for the adjacent cell measurement event is received.
S302, when the switching instruction is not received, whether the difference value between the first signal strength and the second signal strength is larger than or equal to a first preset threshold value or not is determined.
In some embodiments of the present application, when the handover instruction is not received and when the neighboring cell includes a plurality of cells, the terminal may determine a difference between a second signal strength of a cell with a highest signal strength among the neighboring cells and a first signal strength of the serving cell, and determine whether the obtained difference is greater than or equal to a first preset threshold. The first preset threshold may be set arbitrarily according to actual needs, and may be, for example, 10dBm, and the like, which is not limited in this embodiment of the application.
And S303, initializing the triggering times under the condition of receiving the switching instruction returned by the first network equipment.
In some embodiments of the present application, in a case that a handover instruction returned by a first network device is received, a terminal may set the number of triggers to 0, and then perform re-accumulation of the number of triggers in the following; in other embodiments, the terminal may also set the number of triggers to other values, which is not limited in this application embodiment.
And S304, triggering the radio resource control connection reconnection based on the switching instruction, and performing cell reselection.
In this embodiment of the present application, S303 and S304 may be executed simultaneously, so that when the terminal receives the handover instruction returned by the first network device, the number of triggers may be set to zero, so as to perform accumulation of the number of triggers again, and simultaneously trigger RRC reconnection for cell reselection. In some embodiments of the present application, S303 and S304 may also be performed sequentially, and the execution order is not limited in this embodiment of the present application.
And S305, initializing the triggering times under the condition that the difference value is smaller than a first preset threshold value.
In some embodiments of the present application, when the difference is smaller than a first preset threshold, it indicates that the difference between the signal qualities of the serving cell and the neighboring cell is small, and the handover may not be performed, and the terminal may initialize the trigger times, for example, clear the trigger times to perform the re-accumulation of the trigger times.
And S306, adding one to the triggering times to obtain updated triggering times under the condition that the difference value is greater than or equal to the first preset threshold value.
In some embodiments of the present application, when it is determined that the difference is greater than or equal to the first preset threshold, it indicates that a cell with high signal quality exists in the neighboring cell, at this time, the terminal may control the value (trigger number) of the internal counter to add 1, to obtain a new count value of the counter,
and S307, determining whether the updated triggering times are more than or equal to the preset times.
In some embodiments of the present application, after obtaining the new count value, the terminal may determine whether the obtained new count value is greater than or equal to a preset value (preset number of times), so as to perform RRC reconnection or perform continuous measurement and reporting of the neighboring cell according to the determination result. The preset number of times can be arbitrarily set according to actual needs, for example, the number of times can be 10, and the like, which is not limited in the embodiment of the present application.
And S308, returning to execute S101 under the condition that the updated triggering times are less than the preset times.
In the embodiment of the application, after determining that the updated triggering times are greater than or equal to the preset times and triggering RRC reconnection, the terminal may clear the count of the timer to restart the accumulation of the triggering times from zero.
And S2011, when the updated triggering times are larger than or equal to the preset times, triggering the radio resource control connection reconnection to reselect the cell.
Fig. 5 is an optional flowchart of the method provided in the embodiment of the present application, based on fig. 2, after S101 and before S102, S401-S408 may be executed, and S201 may be implemented by S2012:
s401, determining whether a switching instruction returned by the first network equipment for the adjacent cell measurement event is received.
S402, when the switching instruction is not received, whether the first signal strength is smaller than or equal to a second preset threshold value is determined.
In some embodiments of the present application, when the terminal does not receive the handover command, the terminal may determine whether the signal strength of the currently accessed serving cell is less than or equal to a second preset threshold, so as to determine whether the signal quality of the serving cell is poor. The second preset threshold may be arbitrarily set according to actual needs, for example, may be-120 dBm, and the like, which is not limited in the embodiment of the present application.
And S403, initializing the triggering times when receiving the switching instruction returned by the first network equipment.
And S404, triggering the radio resource control connection reconnection based on the switching instruction, and performing cell reselection.
In this embodiment of the present application, S403 and S404 may be executed simultaneously, so that when the terminal receives a handover instruction returned by the first network device, the number of triggers may be set to zero, so as to perform accumulation of the number of triggers again, and simultaneously trigger RRC reconnection for cell reselection. In some embodiments of the present application, S403 and S404 may also be executed sequentially, and the execution order is not limited in this embodiment of the present application.
S405, initializing the triggering times under the condition that the first signal intensity is larger than a second preset threshold value.
In some embodiments of the present application, when the first signal strength is greater than the second preset threshold, it indicates that the signal quality of the serving cell is not very poor, and the terminal may not perform handover, and may zero the trigger number to perform re-accumulation of the trigger number.
And S406, under the condition that the first signal intensity is smaller than or equal to a second preset threshold, adding one to the triggering times to obtain updated triggering times.
In some embodiments of the present application, when it is determined that the first signal strength is less than or equal to the second preset threshold, which indicates that the signal quality of the serving cell is poor, the terminal may control the value (trigger count) of the internal counter to add 1 to obtain a new count value of the counter,
and S407, determining whether the updated triggering times are greater than or equal to preset times.
In some embodiments of the present application, when a new count value of the counter is obtained, it may be determined whether the obtained new count value is greater than or equal to a preset value, so that RRC reconnection may be performed, or continuous measurement and reporting of a neighboring cell may be performed according to a determination result.
And S408, returning to execute S101 when the updated triggering times are less than the preset times.
In the embodiment of the application, after determining that the updated triggering times are greater than or equal to the preset times and triggering RRC reconnection, the terminal may clear the count of the timer to restart the accumulation of the triggering times from zero.
And S2012, when the updated triggering times are greater than or equal to the preset times, triggering the RRC connection reconnection to perform cell reselection.
Fig. 6 is an optional flowchart of the method according to the embodiment of the present application, and based on fig. 4, after S301 and before S306, S501 may be executed, S305 may be executed as S3051, and S306 may be executed as S3061:
s501, determining whether the first signal strength is smaller than or equal to a second preset threshold value.
In some embodiments of the present application, in order to reduce unnecessary cell handover in the case that the signal quality of the current serving cell is good, the terminal may continue to determine whether the signal strength of the serving cell is less than or equal to a second preset threshold after determining that the difference between the signal strengths of the serving cell and the neighboring cell is greater than or equal to or lower than the preset threshold.
In other embodiments of the present application, S302 and S501 may also be executed simultaneously, which is not limited in this embodiment of the present application.
S3051, adding one to the triggering times to obtain updated triggering times under the condition that the difference is greater than or equal to a first preset threshold and the first signal strength is less than or equal to a second preset threshold.
In some embodiments of the present application, when the terminal determines that the difference between the signal strengths of the serving cell and the neighboring cell is greater than or equal to a preset threshold and the signal strength of the serving cell is less than or equal to a second preset threshold, the terminal may control a value (trigger frequency) of an internal counter to add 1 to obtain a new count value of the counter and determine whether the obtained new count value is greater than or equal to the preset value, so as to perform RRC reconnection or perform continuous measurement and reporting of the neighboring cell according to the determination result, so as to reduce unnecessary cell switching and improve network stability of the terminal.
S3061, initializing the triggering times under the condition that the difference value is smaller than a first preset threshold value or the first signal intensity is larger than a second preset threshold value.
In some embodiments of the present application, when the first signal strength is greater than the second preset threshold, it indicates that the signal quality of the serving cell and the neighboring cell is not very poor, and handover may not be performed, and when the difference cell is greater than the first preset threshold, it indicates that the signal quality difference between the serving cell and the neighboring cell is small, and handover may not be performed; in either case, the terminal may clear the trigger times to perform the re-accumulation of the trigger times.
Next, an exemplary application of the embodiment of the present application in a practical application scenario will be described. Fig. 7 is a flowchart of an exemplary cell handover method provided in an embodiment of the present application, where the method includes:
s11, the terminal executes cell selection;
s12, the terminal carries out cell residence according to the selected cell;
s13, the terminal establishes RRC connection with the network equipment corresponding to the resident cell (service cell), and is in a connection state;
s14, measuring the signal quality of the adjacent cell and reporting the measurement event;
s15, when the measurement event is A3/A4/A5, determining whether a switching instruction sent by the network equipment is received;
and S16, initializing the triggering times, actively and locally releasing the RRC connection and returning to execute S11 when receiving the switching command returned by the network equipment.
S17, when a switching instruction sent by the network equipment is not received, determining whether the difference value between the signal intensity of the current cell and the signal intensity of the adjacent cell is greater than or equal to 10dBm or not, and whether the first signal intensity is less than or equal to-120 dBm or not;
s18, when the difference between the signal intensity of the current cell and the signal intensity of the adjacent cell is larger than or equal to 10dBm and the first signal intensity is smaller than or equal to, adding one to the triggering times to obtain updated triggering times;
and S19, resetting the triggering times when the difference between the signal intensity of the current cell and the signal intensity of the adjacent cell is less than 10dBm and the first signal intensity is greater than-120 dBm.
S20, determining whether the updated triggering times are more than or equal to 10;
and S21, when the updated triggering times are more than 10, actively and locally releasing the RRC connection, and returning to execute S11.
S22, when the updated trigger number is less than 10, returning to continue executing S14.
Fig. 8 is a schematic structural diagram of a terminal provided in an embodiment of the present application. As shown in fig. 8, the terminal includes: a sending module 11, configured to report a measurement event to a first network device corresponding to a currently accessed serving cell when the first network device establishes a radio resource control connection;
a connection module 12, configured to trigger a radio resource control connection reconnection to perform cell reselection when a connection reselection condition is met without receiving a switching instruction returned by the first network device for the neighboring cell measurement event if the measurement event is a neighboring cell measurement event and the neighboring cell measurement event indicates that the signal quality of the neighboring cell is higher than that of the serving cell.
In some embodiments of the present application, the connection module 12 is further configured to determine whether a call service exists before the triggering rrc connection reconnection and cell reselection.
In some embodiments of the present application, the connection module 12 is further configured to trigger a rrc connection reconnection to perform cell reselection when there is no call service.
In some embodiments of the present application, the neighbor cell measurement event comprises: a first signal strength of the serving cell and a second signal strength of the neighbor cell; the connection reselection conditions include: the triggering times are more than or equal to the preset times; the connection module 12 is further configured to, when the handover instruction returned by the first network device for the neighboring cell measurement event is not received and a connection reselection condition is met, trigger a radio resource control connection reconnection, and determine whether a handover instruction returned by the first network device for the neighboring cell measurement event is received before cell reselection; when the switching instruction is not received, determining whether the difference value between the first signal strength and the second signal strength is greater than or equal to a first preset threshold value; under the condition that the difference value is greater than or equal to the first preset threshold value, adding one to the triggering times to obtain updated triggering times; and determining whether the updated triggering times are greater than or equal to preset times.
In some embodiments of the present application, the neighbor cell measurement event comprises a first signal strength of the serving cell; the connection reselection conditions include: the triggering times are more than or equal to the preset times; the connection module 12 is further configured to, when the handover instruction returned by the first network device for the neighboring cell measurement event is not received and a connection reselection condition is met, trigger a radio resource control connection reconnection, and determine whether a handover instruction returned by the first network device for the neighboring cell measurement event is received before cell reselection; when the switching instruction is not received, determining whether the first signal strength is less than or equal to a second preset threshold value; under the condition that the first signal intensity is smaller than or equal to the second preset threshold, adding one to the triggering times to obtain updated triggering times; and determining whether the updated triggering times are greater than or equal to preset times.
In some embodiments of the application, the connection module 12 is further configured to, when the handover instruction is not received, add one to the number of triggers when the difference is greater than or equal to the first preset threshold, and determine whether the first signal strength is less than or equal to a second preset threshold before obtaining an updated number of triggers.
In some embodiments of the application, the connection module 12 is further configured to add one to the triggering number to obtain an updated triggering number when the difference is greater than or equal to the first preset threshold and the first signal strength is less than or equal to the second preset threshold.
In some embodiments of the present application, the connection module 12 is further configured to initialize the number of triggers when receiving a handover instruction returned by the first network device after the determining whether the handover instruction returned by the first network device for the neighbor cell measurement event is received and before the determining whether the updated number of triggers is greater than or equal to a preset number of times; and triggering the radio resource control connection reconnection based on the switching instruction to perform cell reselection.
In some embodiments of the present application, the connection module 12 is further configured to initialize the number of triggering times when the difference value is smaller than the first preset threshold before determining whether the updated number of triggering times is larger than or equal to a preset number after determining whether the difference value between the first signal strength and the second signal strength is larger than or equal to the first preset threshold when the handover instruction is not received.
In some embodiments of the present application, the connection module 12 is further configured to initialize the triggering time when the first signal strength is greater than the second preset threshold after determining whether the first signal strength is less than or equal to the second preset threshold and before determining whether the updated triggering time is greater than or equal to the preset time when the handover instruction is not received.
In some embodiments of the present application, the connection module 12 is further configured to determine a target cell from the neighboring cells according to the neighboring cell measurement event; the target cell is a cell with the highest signal quality in the adjacent cells; and disconnecting the radio resource control connection with the first network equipment, and reestablishing the radio resource control connection with second network equipment corresponding to the target cell so as to access the target cell.
In some embodiments of the present application, the first network device is a network device of a fifth generation mobile communication technology.
An embodiment of the present application further provides a terminal, and fig. 9 is another schematic structural diagram of the terminal provided in the embodiment of the present application; as shown in fig. 9, the terminal includes: a receiver 21, a transmitter 22, a memory 23, and a processor 24; the transmitter 22, receiver 21, memory 23 and processor 24 are connected by a communication bus 25. A memory 23 for storing executable computer programs, data received by the receiver 21, and data that the transmitter 22 needs to transmit; the receiver 21, the transmitter 22 and the memory 23 operate over a communication bus in dependence on the processor 24, which when executed by the processor 24, implement the cell handover method described above.
Embodiments of the present application provide a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and executes the computer instructions, so that the computer device executes the cell handover method described in the embodiment of the present application.
Embodiments of the present application provide a computer-readable storage medium storing executable instructions, which when executed by a processor, cause the processor to perform a method provided by embodiments of the present application, for example, the cell handover method described above.
In some embodiments, the computer-readable storage medium may be memory such as FRAM, ROM, PROM, EP ROM, EEPROM, flash memory, magnetic surface memory, optical disk, or CD-ROM; or may be various devices including one or any combination of the above memories.
In some embodiments, executable instructions may be written in any form of programming language (including compiled or interpreted languages), in the form of programs, software modules, scripts or code, and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
By way of example, executable instructions may correspond, but do not necessarily have to correspond, to files in a file system, and may be stored in a portion of a file that holds other programs or data, such as in one or more scripts in a hypertext Markup Language (H TML) document, in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub-programs, or portions of code).
By way of example, executable instructions may be deployed to be executed on one computing device or on multiple computing devices at one site or distributed across multiple sites and interconnected by a communication network.
In summary, according to the embodiments of the present application, when there is a cell handover requirement, the terminal may actively switch to the target cell, and compared with performing cell handover according to a handover instruction issued by the base station, the timeliness of cell handover is improved, and the terminal can timely switch to the target cell with better signal quality, so as to improve the network quality of the terminal.
The above description is only an example of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, and improvement made within the spirit and scope of the present application are included in the protection scope of the present application.
Claims (16)
1. A cell switching method is applied to a terminal and comprises the following steps:
under the condition that a first network device corresponding to a currently accessed service cell establishes a radio resource control connection, reporting a measurement event to the first network device;
if the measurement event is an adjacent cell measurement event, and the quality of the signal of the adjacent cell represented by the adjacent cell measurement event is higher than that of the serving cell, triggering radio resource control connection reconnection to perform cell reselection when a connection reselection condition is met under the condition that a switching instruction returned by the first network device for the adjacent cell measurement event is not received.
2. The cell handover method according to claim 1, wherein before triggering rrc connection reconnection for cell reselection, the method further comprises:
it is determined whether a call service exists.
3. The cell handover method according to claim 2, wherein the triggering rrc connection reconnection for cell reselection comprises:
and under the condition that the call service does not exist, triggering the radio resource control connection reconnection to perform cell reselection.
4. The cell handover method of claim 1, wherein the neighbor cell measurement event comprises: a first signal strength of the serving cell and a second signal strength of the neighbor cell; the connection reselection conditions include: the triggering times are more than or equal to the preset times;
when the handover instruction returned by the first network device for the neighbor cell measurement event is not received, and when a connection reselection condition is met, triggering a radio resource control connection reconnection, before performing cell reselection, the method further includes:
determining whether a switching instruction returned by the first network equipment for the neighbor cell measurement event is received;
when the switching instruction is not received, determining whether the difference value between the first signal strength and the second signal strength is greater than or equal to a first preset threshold value;
under the condition that the difference value is greater than or equal to the first preset threshold value, adding one to the triggering times to obtain updated triggering times;
and determining whether the updated triggering times are greater than or equal to preset times.
5. The cell handover method of claim 1, wherein the neighbor cell measurement event comprises a first signal strength of the serving cell; the connection reselection conditions include: the triggering times are more than or equal to the preset times;
when the handover instruction returned by the first network device for the neighbor cell measurement event is not received, and when a connection reselection condition is met, triggering a radio resource control connection reconnection, before performing cell reselection, the method further includes:
determining whether a switching instruction returned by the first network equipment for the neighbor cell measurement event is received;
when the switching instruction is not received, determining whether the first signal strength is less than or equal to a second preset threshold value;
under the condition that the first signal intensity is smaller than or equal to the second preset threshold, adding one to the triggering times to obtain updated triggering times;
and determining whether the updated triggering times are greater than or equal to preset times.
6. The cell switching method according to claim 4, wherein when the switching instruction is not received and the difference is greater than or equal to the first preset threshold, before adding one to the number of triggers to obtain an updated number of triggers, the method further comprises:
determining whether the first signal strength is less than or equal to a second preset threshold.
7. The cell switching method according to claim 6, wherein the step of adding one to the number of triggers to obtain an updated number of triggers when the difference is greater than or equal to the first preset threshold comprises:
and under the condition that the difference value is greater than or equal to the first preset threshold value and the first signal strength is less than or equal to the second preset threshold value, adding one to the triggering times to obtain updated triggering times.
8. The cell switching method according to any one of claims 4 to 7, wherein the triggering radio resource control connection reconnection for cell reselection when a connection reselection condition is met without receiving a handover instruction returned by the first network device for the neighbor cell measurement event comprises:
and under the condition that a switching instruction returned by the first network equipment for the adjacent cell measurement event is not received, triggering the radio resource control connection reconnection to perform cell reselection when the triggering times are greater than or equal to the preset times.
9. The cell switching method according to claim 4 or 5, wherein after the determining whether the switching instruction returned by the first network device for the neighbor cell measurement event is received and before the determining whether the updated number of triggers is greater than or equal to a preset number, the method further comprises:
initializing the triggering times under the condition of receiving a switching instruction returned by the first network equipment;
and triggering the radio resource control connection reconnection based on the switching instruction to perform cell reselection.
10. The method of claim 4, wherein after the determining whether the difference between the first signal strength and the second signal strength is greater than or equal to a first preset threshold value and before the determining whether the updated number of triggers is greater than or equal to a preset number of times when the handover command is not received, the method further comprises:
and initializing the triggering times under the condition that the difference value is smaller than the first preset threshold value.
11. The method of claim 5, wherein after the determining whether the first signal strength is less than or equal to a second predetermined threshold and before the determining whether the updated number of triggers is greater than or equal to a predetermined number when the handover command is not received, the method further comprises:
and initializing the triggering times under the condition that the first signal strength is greater than the second preset threshold value.
12. The cell handover method according to any of claims 1 to 11, wherein the first network device is a network device of a fifth generation mobile communication technology.
13. The cell handover method according to claim 1, wherein the triggering rrc connection reconnection for cell reselection comprises:
determining a target cell from the neighbor cells according to the neighbor cell measurement event; the target cell is a cell with the highest signal quality in the adjacent cells;
and disconnecting the radio resource control connection with the first network equipment, and reestablishing the radio resource control connection with second network equipment corresponding to the target cell so as to access the target cell.
14. A terminal, comprising:
a sending module, configured to report a measurement event to a first network device corresponding to a currently accessed serving cell when the first network device establishes a radio resource control connection;
and if the measurement event is an adjacent cell measurement event, and the adjacent cell measurement event indicates that the signal quality of the adjacent cell is higher than that of the serving cell, triggering radio resource control connection reconnection when a connection reselection condition is met and performing cell reselection under the condition that a switching instruction returned by the first network device for the adjacent cell measurement event is not received.
15. A terminal, comprising:
a receiver, a transmitter, a memory, and a processor;
the memory is used for storing executable instructions, data received by the receiver and data required to be transmitted by the transmitter; the receiver, the transmitter, and the memory rely on the processor to perform operations over a communication bus; the processor, when executing the executable instructions, is configured to implement the method of any one of claims 1 to 13.
16. A computer-readable storage medium having stored thereon executable instructions for, when executed by a processor, implementing the method of any one of claims 1 to 13.
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| CN202011241703.5A CN112399514A (en) | 2020-11-09 | 2020-11-09 | Cell switching method, terminal and computer readable storage medium |
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