CN109661007B - Cell switching method, communication device and storage medium - Google Patents
Cell switching method, communication device and storage medium Download PDFInfo
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- CN109661007B CN109661007B CN201710943459.9A CN201710943459A CN109661007B CN 109661007 B CN109661007 B CN 109661007B CN 201710943459 A CN201710943459 A CN 201710943459A CN 109661007 B CN109661007 B CN 109661007B
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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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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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
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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
Abstract
The embodiment of the invention discloses a cell switching method, communication equipment and a storage medium. The cell switching method comprises the following steps: determining a remote unit currently accessed by a terminal; querying configuration parameters of the remote unit when a handover condition is satisfied, wherein the configuration parameters at least include: a handover indication parameter; the switching indication parameter is at least used for determining whether the terminal is allowed to switch into a neighbor cell; a cell in which the neighboring cell is adjacent to a coverage area of a corresponding distal region; and determining whether to allow the cell switching of the terminal and/or a target cell allowing the switching according to the switching indication parameter.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a cell switching method, a communication device, and a storage medium.
Background
There is a distributed pico base station (Picocell) in the field of wireless communication.
As shown in fig. 1, the distributed pico base station includes: n remote units, through one or more convergence units, access the N remote units to a central unit. And N is an integer not less than 2, such as 2 or 3. Different remote units cover different areas, but the areas covered by the N remote units belong to the same logical cell.
In fig. 1, the neighbor cells of the serving cell from terminal 1, terminal 2 to terminal M include: neighbor cell a and neighbor cell B. The terminal may switch between the serving cell and neighbor cells a and B. In the prior art, a terminal reports and measures the signal quality of a cell, and performs handover of a cell where the terminal resides according to the cell signal quality measured by the terminal. However, in the prior art, it is found that there is an unnecessary handover of the terminal from a cell with better communication quality to another cell with worse communication quality, or there is a frequent handover back and forth (i.e. ping-pong handover).
Therefore, how to reduce unnecessary handover and avoid ping-pong handover as much as possible is one of the problems to be solved in the prior art.
Disclosure of Invention
In view of the above, embodiments of the present invention are directed to a cell handover method, a communication device and a storage medium, which at least partially solve the above problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a first aspect of the present invention provides a cell switching method, including:
determining a remote unit currently accessed by a terminal;
querying configuration parameters of the remote unit when a handover condition is satisfied, wherein the configuration parameters at least include: a handover indication parameter; the switching indication parameter is at least used for determining whether the terminal is allowed to switch into a neighbor cell; a cell in which the neighboring cell is adjacent to a coverage area of a corresponding distal region;
and determining whether to allow the cell switching of the terminal and/or a target cell allowing the switching according to the switching indication parameter.
Optionally, the determining, according to the handover indication parameter, whether to allow the cell handover of the terminal and/or a target cell allowed to be handed over includes:
when the switching indication parameter does not comprise the cell identification of the adjacent cell or switching is forbidden, the cell switching of the terminal is forbidden;
and/or the presence of a gas in the gas,
and when the switching indication parameter comprises the cell identification of the adjacent cell or the switching permission, allowing the cell of the terminal to switch and selecting the target cell according to the cell identification.
Optionally, when the coverage area of the remote unit is an edge area of a current cell where the terminal is currently located, the handover indication parameter includes: cell identities of neighbor cells adjacent to the coverage area; and/or, when the coverage area of the remote unit is the center area of the current cell, the handover indication parameter does not include: cell identification of a neighbor cell;
alternatively, the first and second electrodes may be,
when the coverage area of the remote unit is the edge area of the current cell where the terminal is currently located, the switching indication parameter indicates that switching is allowed; and/or, when the coverage area of the remote unit is the central area of the current cell, the handover indication parameter indicates that handover is allowed;
wherein the edge region is located outside the central region.
Optionally, the method further comprises:
receiving a measurement report reported by a terminal;
when the handover indication parameter includes a cell identifier of an adjacent cell, allowing the cell of the terminal to be handed over and selecting the target cell according to the cell identifier includes:
and selecting the target cell by combining the measurement report and the cell identifier in the switching indication parameter of the remote unit currently accessed by the terminal.
Optionally, the selecting the target cell according to the measurement report and a cell identifier in a handover indication parameter of a remote unit to which the terminal is currently connected includes:
and selecting the strongest cell in Reference Signal Received Power (RSRP) in the measurement report as the target cell from the cells corresponding to the cell identification.
Optionally, the determining a remote unit currently accessed by the terminal includes:
and determining a remote unit accessed by the terminal according to the signal strength of the uplink sounding reference signal of the terminal.
Optionally, the method further comprises:
acquiring cell switching result parameters in an evaluation period;
and updating the configuration parameters of the remote unit according to the cell switching result parameters.
Optionally, the updating the configuration parameter of the remote unit according to the cell switching result parameter includes:
if the switching times of the first adjacent cell corresponding to the remote unit are larger than the time threshold and the switching success rate is smaller than the probability threshold, or if the switching times of the first adjacent cell corresponding to the remote unit are larger than the time threshold and the abnormal switching ratio is larger than the abnormal threshold, deleting the cell identifier of the first adjacent cell from the switching indication parameter of the remote unit in the evaluation period.
Optionally, the updating the configuration parameter of the remote unit according to the cell switching result parameter includes:
if the number of times of discovering a second neighbor cell by the remote unit accessing the terminal in the evaluation period reaches a first discovery threshold, adding the cell identifier of the second neighbor cell to the handover indication parameter.
Optionally, the updating the configuration parameter of the remote unit according to the cell switching result parameter includes:
and if the discovery frequency of the second adjacent cell discovered by the terminal accessed by the remote unit reaches a second discovery threshold value in the evaluation period, updating the configuration parameters of the remote unit according to the cell switching result parameters.
A second aspect of an embodiment of the present invention provides a communication device, including:
a first determining unit, configured to determine a remote unit to which the terminal is currently connected;
a query unit, configured to query configuration parameters of the remote unit when a handover condition is satisfied, where the configuration parameters at least include: a handover indication parameter; the switching indication parameter is at least used for determining whether the terminal is allowed to switch into a neighbor cell; a cell in which the neighboring cell is adjacent to a coverage area of a corresponding distal region;
and a second determining unit, configured to determine whether to allow cell handover of the terminal and/or a target cell allowed to be handed over according to the handover indication parameter.
A third aspect of an embodiment of the present invention provides a communication device, including: a transceiver, a memory, a processor, and a computer program stored on the memory and executed by the processor;
the processor is connected to the transceiver and the memory, respectively, and is configured to implement one or more of the foregoing cell handover methods by executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer storage medium, in which a computer program is stored; the computer program, when executed, can implement one or more cell handover methods provided by the technical solutions.
The cell switching method, the communication device and the storage medium provided by the embodiment of the invention can determine which remote unit the cell accesses to the wireless network before cell switching is carried out, and determine whether to allow cell switching of the terminal and/or allow selection of a switched-in target cell according to the configuration parameters of the accessed remote unit when cell switching is carried out.
In this way, on the first hand, the neighboring cell relations corresponding to different remote units in the same cell are different, so that the problems of unnecessary handover, ping-pong handover and other abnormal handovers caused by the fact that a terminal with a coverage area being a cell center area is switched into the neighboring cell can be prohibited.
In the second aspect, when the terminal is located in the coverage area corresponding to the remote unit corresponding to the cell edge position, the terminal is switched into a suitable adjacent cell, and the switching to the adjacent cell far away from the current position is prohibited, so that the switching success rate can be improved.
In the third aspect, unnecessary switching is reduced, and repeated switching caused by unsuccessful switching is reduced, so that signaling overhead and switching resource overhead generated by switching can be reduced, and the method has the characteristic of low consumption of the signaling overhead and the communication resources.
Drawings
FIG. 1 is a schematic diagram of a distributed antenna system
Fig. 2 is a flowchart illustrating a first cell handover method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a second cell handover method according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a third cell handover method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another communication device according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a fourth cell handover method according to an embodiment of the present invention.
Detailed Description
Research shows that the neighbor cell relation tables and the switching parameters of neighbor cells configured by different remote units of the same cell in the antenna distributed system are the same, and the adopted switching strategies are also the same. However, due to the transmission characteristics of the radio signal, even if a terminal connected to the network through a remote area corresponding to the central area of the cell can still monitor the signal of the neighboring cell, the signal strength of the radio signal of the neighboring cell is measured, and cell handover is triggered. However, when the cell is located in the central area of the current serving cell, handover to other cells is obviously not needed, or handover to other cells with poorer communication quality is obviously not needed, so that problems such as frequent handover and the like are caused. Therefore, in this embodiment, different remote units no longer share the configuration parameters for cell handover of the terminal, but different remote units in the same cell have different configuration parameters for cell handover of the terminal. Therefore, in the embodiment of the present invention, before performing cell handover of a terminal, it is necessary to determine a remote unit to which the terminal is currently accessed, and then perform cell handover of the terminal based on configuration parameters of the remote unit to which the terminal is accessed, which may specifically include: it is determined whether the terminal is allowed to perform cell handover or a neighbor cell specifically handed in when the terminal is allowed to perform handover. The neighboring cell is the target cell where the terminal resides after being handed out from the current cell. The technical solution of the present invention is further described in detail with reference to the drawings and the specific embodiments of the specification.
As shown in fig. 2, the present embodiment provides a cell handover method, including:
step S110: determining a remote unit currently accessed by a terminal;
step S120: when a switching condition is met, inquiring configuration parameters of the remote unit, wherein the switching indication parameters are at least used for determining whether the terminal is allowed to be switched into a neighbor cell; a cell in which the neighboring cell is adjacent to a coverage area of a corresponding distal region;
step S130: and when the cell switching of the terminal and/or the target cell allowing the switching are determined according to the switching indication parameters.
The cell switching method provided in this embodiment may be a method applied to a switching device, for example, a cell switching method applied to a terminal of a centralized unit of a distributed antenna system.
In this embodiment, a determination is first made as to whether the terminal is accessing the base station or accessing the remote unit in the distributed antenna system. In this embodiment, the remote unit may be configured to directly perform wireless signal interaction with the terminal, for example, receive a wireless signal reported by the terminal, and/or convert a signal sent by the central unit and the aggregation unit into a wireless signal and send the wireless signal to the terminal.
As shown in fig. 1, N remote units may be included in a cell, with the coverage areas of different remote units being at least partially different. Generally, if a terminal accesses a network through a remote unit n, the remote unit is located in an area covered by a wireless signal of the remote unit n. Generally, due to the transmission characteristics of wireless signals, a terminal may receive wireless signals transmitted by a plurality of remote units at a location, or a wireless signal transmitted by a terminal may be received by a plurality of remote units, but since the location of the terminal has the maximum received signal strength or the maximum transmitted signal strength of one remote unit, the terminal accesses to a base station or a distributed antenna system through the remote unit with the maximum received signal strength or the maximum transmitted signal strength. In this embodiment, it is first necessary to determine the remote unit currently accessed by the terminal. For example, the step S110 may include: and determining a remote unit accessed by the terminal according to the Signal strength of an uplink Sounding Reference Signal (SRS) of the terminal. In this embodiment, the remote terminal to which the terminal is accessed is determined according to the SRS, and in a specific implementation process, the remote terminal may also be determined according to other signals, for example, a traffic signal used by the terminal to transmit uplink data, or a control signal used to transmit uplink control information, and the like, which is not limited to the SRS.
When the switching condition is satisfied, the configuration parameters of the remote unit currently accessed by the terminal need to be inquired.
The handover indication parameter of the remote unit may in some embodiments comprise: cell identification of the neighbor cell that is allowed to hand in.
In the embodiments of the present invention, the remote units can be divided into two categories, one being edge remote units and center remote units. In the embodiment of the present invention, the coverage area of the edge remote unit is an edge area of a cell; the coverage area of the central distal region is the central region of the cell. The central area may be in the middle of the edge area, or the edge area surrounds the central area, where the edge area and the central area are the location areas of the geographic locations corresponding to the cells.
Therefore, in this embodiment, the edge area will border the neighboring cells, and the central area will not border the neighboring cells. Therefore, in this embodiment, it can be considered that the edge remote unit will border the neighboring cell, and the central line region will not border the neighboring cell. If the coverage area of the remote unit borders the neighboring cell, the coverage area of the remote unit is adjacent to the neighboring cell.
Therefore, in the embodiment of the present invention, the cell identifier of the neighboring cell included in the cell indication parameter of the edge remote unit is the identifier of the cell adjacent to the coverage area of the corresponding remote unit.
In this embodiment, the configuration parameters at least include: a handover indication parameter, which may be one or more cell identification bytes. The byte content of the cell identification byte can be used to record the cell identification of the neighbor cell accessible to the network terminal through the corresponding remote unit access.
In this embodiment, the form of the handover indication parameter may be various, for example, one or more bytes as described above. In other embodiments, the handover indication parameter may also be: a list. The list records the cell identifier of the neighboring cell corresponding to the remote unit, and may be referred to as a neighboring cell relation table, a neighboring cell list, or a target cell list.
In still other embodiments, the handover indication parameter may also be 1 or more bits, the 1 or more bits being used to indicate whether a cell handover is allowed for a terminal that is allowed to access the network through. For example, two states of allowing cell switching and prohibiting cell switching are indicated by values of "0" and "1" of 1 bit. Specifically, which target cell is to be handed over to may be determined according to the signal strength of the neighboring cell measured by the terminal itself, and specifically how to select the handed-in target cell, here, the neighboring cell with the largest signal strength, or any neighboring cell with a signal strength greater than the handover threshold value, or a neighboring cell with a signal strength greater than the handover threshold value and a signal strength continuously greater than the handover threshold value and reaching the time threshold value may be selected.
As shown in fig. 1, the handover indication parameter in the configuration parameters of the remote unit 1 includes: cell identity of neighbor cell a; the handover indication parameter in the configuration parameters of the remote unit N includes: cell identity of neighbor cell B. The handover indication parameter in the configuration parameters from remote unit 2 to remote unit N-1 at least does not include the cell identities of neighboring cell a and neighboring cell B. If remote unit 1 and remote unit N belong to edge remote units and the coverage area of remote units 2 to N-1 is not adjacent to other neighbor cells, then these remote units 2 to N-1 are all central remote areas.
In any case, the handover indication parameter configured in the configuration parameter of the remote unit in the embodiment of the present invention is different, and is specifically determined according to whether the coverage area of the corresponding remote unit is adjacent to the neighboring cell.
In step S130 in the embodiment of the present invention, it is determined whether to allow handover of the terminal and/or a target cell to which handover is allowed according to the handover indication parameter.
In this case, since the coverage area of the central remote unit is not adjacent to the neighboring cell of the current cell, the handover indication parameter of the central remote unit does not include: the cell id of the neighboring cell indicates that the terminal accessed through the central remote unit does not allow cell handover, while the terminal accessed through the edge remote unit allows cell handover, and the cell allowed to be handed in is the neighboring cell adjacent to the coverage area of the corresponding edge remote unit.
Therefore, the switching of the terminal accessed to the network through the central remote unit is reduced, and the switching of the terminal accessed to the network by utilizing the edge remote unit to the adjacent cell of which the coverage area of the accessed edge remote unit is not adjacent is reduced, thereby reducing unnecessary switching, unsuccessful switching and ping-pong switching, reducing unnecessary switching, improving the success rate of switching, and reducing the signaling overhead and occupied communication resources caused by unnecessary switching.
In this embodiment, the configuration parameters at least include: cell
Alternatively, as shown in fig. 3, the step S130 may include at least one of:
step S131: when the switching indication parameter does not comprise the cell identification of the adjacent cell or indicates to forbid switching, forbidding the cell switching of the terminal;
step S132: and when the switching indication parameter comprises the cell identification of the adjacent cell or indicates the permission of switching, the cell of the terminal is permitted to be switched, and the target cell is selected according to the cell identification.
If the handover indication parameter of a remote unit does not include the cell identifier of a neighboring cell, indicating that the coverage area of the remote unit is adjacent to the neighboring cell of the cell to which the remote unit belongs, cell handover is allowed, and handover is allowed only to the neighboring cell adjacent to the coverage area of the remote unit. If the handover indication parameter of a remote unit includes a cell identifier of a neighboring cell, indicating that the coverage area of the remote unit is not adjacent to the neighboring cell of the cell to which the remote unit belongs, cell handover is prohibited.
In some embodiments, if the network is at the edge of the network infrastructure, even the handover indication parameters of the edge remote unit may not include: cell identity of the neighbor cell. For example, there may not be a cellular network in open sea, and during the erection of the base stations, the handover indication parameter of the marginal remote unit of the cell formed by the base station closest to open sea may be empty.
In some embodiments, when the coverage area of the remote unit is an edge area of a current cell in which the terminal is currently located, the handover indication parameter includes: cell identities of neighbor cells adjacent to the coverage area;
and/or the presence of a gas in the gas,
when the coverage area of the remote unit is the center area of the current cell, the handover indication parameter does not include: cell identification of a neighbor cell;
the edge region is located outside the central region.
For example, when the remote unit is an edge remote unit, the handover indication parameter is not null, and the parameter content of the cell edge parameter is a cell identifier of a neighboring cell adjacent to the coverage area of the edge remote unit.
For another example, if the cell identifier is empty when the remote unit is a central remote unit, it indicates that the coverage area of the central remote unit is geographically separated from the neighboring cells.
In other embodiments, when the coverage area of the remote unit is an edge area of a current cell where the terminal is currently located, the handover indication parameter indicates that handover is allowed;
and/or the presence of a gas in the gas,
when the coverage area of the remote unit is the central area of the current cell, the handover indication parameter indicates that handover is allowed;
wherein the edge region is located outside the central region.
In this embodiment, the handover indication parameter may be one or more bits, which directly indicate the indication bits for allowing or disallowing handover (i.e. prohibiting handover).
In some embodiments, the configuration parameters may further include: the measurement parameters can be used for indicating the measurement of parameters such as wireless signals sent by the cell and/or the neighboring cell, measurement period, measured frequency points and the like, and the measurement parameters can be used for indicating how the cell performs the measurement of relevant parameters such as communication signal quality of the cell and/or the neighboring cell.
In other embodiments, the configuration parameters may further include: and switching parameters. The handover parameter may be used to indicate how to perform handover, for example, a handover mode, and handover between cells may be performed according to the handover mode.
Optionally, the method further comprises:
receiving a measurement report reported by a terminal;
the step S132 may include:
and selecting the target cell by combining the measurement report and the cell identifier in the switching indication parameter of the remote unit currently accessed by the terminal.
The terminal performs measurement of radio signals and/or measurement of channel states of the own cell and the neighboring cells, for example, measures sounding reference signals and/or demodulation reference signals, and measures parameters indicating signal quality such as received power, received signal strength, and signal-to-noise ratio of these signals. And then, generating the measurement report according to the measured parameters, and sending the measurement report to a network side device, for example, a base station, so that the network side device receives the measurement report, and when determining a target cell to which the terminal is handed in, selecting the target cell by combining with a handover indication parameter of a remote unit through which the terminal of the measurement report passes in a current cell access network.
For example, the handover indication parameters of the remote unit include: and the cell identifiers of the adjacent cell 1 and the adjacent cell 2, the target cell is limited to the adjacent cell 1 and the adjacent cell 2.
The step S132 may include:
and selecting the neighbor cell with the strongest reported signal quality in the measurement report as the target cell from the cells corresponding to the cell identifiers in the switching indication parameters. For example, the step S120 may specifically be:
and selecting the strongest cell in Reference Signal Received Power (RSRP) in the measurement report as the target cell from the cells corresponding to the cell identification.
In other embodiments, the step S132 may include:
and selecting the cell with the signal quality exceeding a preset switching threshold reported in the measurement report as the target cell from the cells corresponding to the cell identifiers in the switching indication parameters.
In still other embodiments, the step S132 may include:
and selecting a cell of which the signal quality reported in the measurement report exceeds a preset switching threshold and the duration of which exceeds the preset switching threshold is greater than a time threshold from the cells corresponding to the cell identifiers in the switching indication parameters, and taking the selected adjacent cell as the target cell.
In some embodiments, as shown in fig. 4, the method further comprises:
step S101: acquiring cell switching result parameters in an evaluation period;
step S102: and updating the configuration parameters of the remote unit according to the cell switching result parameters.
In this embodiment, a cell handover result parameter in the evaluation period is also obtained. In this embodiment, the cell switching result parameter is counted by the remote unit.
For example, the handover result parameters of the terminal accessing the network by the nth remote unit are counted, where the handover result parameters may include: the cell switching times, the switching success rate, the cell number of the adjacent cell requesting access, the cell identification of the adjacent cell and other parameters.
In this embodiment, in order to reduce the statistical operation, the cell handover result parameter may be collected, counted, or processed only for the remote edge unit.
And then dynamically updating the configuration parameters of the remote unit according to the cell switching result parameters, for example, dynamically updating the configuration parameters of the edge remote unit. Specifically, the handover indication parameter of the remote unit is dynamically updated according to the cell handover result.
The step S102 may include:
if the handover frequency of the first neighboring cell corresponding to the remote unit is greater than the frequency threshold and the handover success rate is less than the probability threshold within the evaluation period.
If the number of times of initiating handover to an adjacent cell is large but the handover success rate is low in one evaluation period, it is obvious that the success rate of handover to the adjacent cell is low when the terminal accesses the network through the remote unit, and in order to reduce unnecessary handover and improve the handover success rate, in this embodiment, the cell identifier of the adjacent cell is removed from the handover indication parameter.
The step S102 may further include:
and if the switching times of the first adjacent cell corresponding to the remote unit are greater than the switching threshold and the abnormal switching ratio is greater than the abnormal threshold, deleting the cell identifier of the first adjacent cell from the switching indication parameter of the remote unit.
In some cases, a handover procedure for switching into the first neighboring cell is initiated and the handover success rate is high, but the handover procedure for switching the terminal to the current cell is automatically triggered in a short time, resulting in ping-pong handover. In this embodiment, the ping-pong switching is a back-and-forth switching in which the switching frequency is greater than a preset switching frequency. Ping-pong switching is one of the abnormal switching. If the ping-pong switching ratio in the evaluation period reaches a preset ratio, the abnormal switching ratio can be considered to be greater than the abnormal threshold value.
In some cases, the hand-in to the first neighboring cell is initiated and the handover is successful, but through signal interaction with the neighboring cell, the communication quality after the terminal is handed in to the neighboring cell is found to be lower than the communication quality of the terminal residing in the cell. Here, the communication quality may include: signal strength, signal power, etc. of the communication quality associated with the wireless signal may also include: communication response delay and other parameters reflect the communication quality in terms of response speed. However, such switching abnormality may require that abnormal switching caused by load balancing be eliminated.
In short, in this embodiment, it may also be determined whether the cell identifier of a certain neighboring cell in the handover indication parameter needs to be deleted in combination with the handover frequency and the handover abnormal ratio, so as to reduce unnecessary handovers.
The step S102 may include:
if the number of times of discovering a second neighbor cell by the remote unit accessing the terminal in the evaluation period reaches a first discovery threshold, adding the cell identifier of the second neighbor cell to the handover indication parameter.
In this embodiment, the number of times of discovery may be the number of times of occurrence of a cell identifier of a certain neighboring cell in a measurement report that triggers a cell handover procedure, that is, the number of times of a certain neighboring cell that is measured to meet a handover threshold in an evaluation period. If the number of times of the cell identifier of a certain neighboring cell in the measurement report reported by the terminal accessed by the nth remote unit is greater than the first discovery threshold in an evaluation period and the cell identifier of the neighboring cell is not included in the handover indication parameter, adding the cell identifier of the second neighboring cell to the handover indication parameter, and if the cell identifier of the neighboring cell is included in the handover indication parameter, maintaining the cell identifier of the neighboring cell in the handover indication parameter. This enables the addition of cell identities in the cell identity parameter of the remote unit.
In other embodiments, configuration parameters such as switching indication parameters of the remote unit may also be changed based on input from the staff.
In this embodiment, the dynamically updating the configuration parameters may include: and dynamically updating the switching indication parameters of the edge remote units.
Optionally, the step S102 may further include:
and if the discovery frequency of the second adjacent cell discovered by the terminal accessed by the remote unit reaches a second discovery threshold value in the evaluation period, updating the configuration parameters of the remote unit according to the cell switching result parameters.
The second discovery threshold may be a threshold that triggers dynamic update of configuration parameters, and the first discovery threshold is a threshold that adds a cell identity of a new neighbor cell to a handover indication parameter.
In this embodiment, the second discovery threshold may be smaller than the first discovery threshold, which is only an example and is not limited to this specific implementation.
As shown in fig. 5, the present embodiment provides a communication apparatus, including:
a first determining unit 110, configured to determine a remote unit currently accessed by a terminal;
a querying unit 120, configured to query configuration parameters of the remote unit when a handover condition is satisfied, where the configuration parameters at least include: a handover indication parameter; the switching indication parameter is at least used for determining whether the terminal is allowed to switch into a neighbor cell; a cell in which the neighboring cell is adjacent to a coverage area of a corresponding distal region;
a second determining unit 130, configured to determine whether to allow cell handover of the terminal and/or a target cell for allowing handover according to the handover indication parameter.
The communication device in this embodiment may be a device on a network side, which is referred to as a network side device for short, and is generally an access device of an access network, for example, a communicable electronic device such as a central unit in fig. 1.
In the communication device provided in this embodiment, before performing cell handover, it is determined whether the terminal accesses a remote unit of a network, and whether to allow cell handover of the terminal, selection of a target cell, and how to perform the cell handover are determined based on configuration parameters of the remote unit.
Optionally, the second determining unit 130 is configured to prohibit cell handover of the terminal when the handover indication parameter does not include a cell identifier of an adjacent cell or indicates that handover is prohibited; and/or, when the switching indication parameter comprises the cell identification of the adjacent cell or indicates the switching permission, the cell switching of the terminal is permitted and the target cell is selected according to the cell identification.
Optionally, the second determining unit 130 is further configured to indicate that the handover is allowed according to the handover indication parameter when the coverage area of the remote unit is an edge area of a current cell where the terminal is currently located; and/or, when the coverage area of the remote unit is the central area of the current cell, the handover indication parameter indicates that handover is allowed; wherein the edge region is located outside the central region.
Optionally, when the coverage area of the remote unit is an edge area of a current cell where the terminal is currently located, the handover indication parameter includes: cell identities of neighbor cells adjacent to the coverage area; and/or, when the coverage area of the remote unit is the center area of the current cell, the handover indication parameter does not include: cell identification of a neighbor cell; the edge region is located outside the central region.
Optionally, the method further comprises:
a receiving unit, configured to receive a measurement report reported by a terminal;
the second determining unit 130 is specifically configured to select the target cell by combining the measurement report and the cell identifier in the handover indication parameter of the remote unit to which the terminal is currently connected.
Optionally, the second determining unit 130 is specifically configured to select, as the target cell, a strongest cell in reference signal received power RSRP in the measurement report from cells corresponding to the cell identifier.
Optionally, the first determining unit 110 is specifically configured to determine, according to the signal strength of the uplink sounding reference signal of the terminal, a remote unit to which the terminal is accessed.
Optionally, the communication device further comprises:
the acquiring unit is specifically used for acquiring cell switching result parameters in an evaluation period;
and the updating unit is used for updating the configuration parameters of the remote unit according to the cell switching result parameters.
Optionally, the updating unit is specifically configured to delete the cell identifier of the first neighboring cell from the handover indication parameter of the remote unit if, in the evaluation period, the handover frequency of the first neighboring cell corresponding to the remote unit is greater than the frequency threshold and the handover success rate is smaller than the probability threshold, or if the handover frequency of the first neighboring cell corresponding to the remote unit is greater than the frequency threshold and the abnormal handover ratio is greater than the abnormal threshold.
Further optionally, the updating unit is specifically configured to add the cell identifier of the second neighboring cell to the handover indication parameter if the number of times of discovery that the remote unit accesses the terminal to discover the second neighboring cell reaches the first discovery threshold in the evaluation period.
In addition, the updating unit is specifically configured to update the configuration parameter of the remote unit according to the cell switching result parameter if the number of times of discovery that the remote unit accesses the terminal to discover the second neighboring cell reaches a second discovery threshold in the evaluation period.
As shown in fig. 6, an embodiment of the present invention provides a communication device, including: a transceiver, a memory, a processor, and a computer program stored on the memory and executed by the processor;
the communication device may include: a transceiver 310, a memory 320, a processor 330, and a computer program stored on the memory 320 and executed by the processor 330;
the processor 330 is connected to the transceiver 310 and the memory 320, respectively, and configured to implement, by executing the computer program, the SRS transmission method provided by one or more technical solutions, or implement the cell handover method provided by one or more technical solutions.
The transceiver 310 may be a transceiver antenna in a communication device;
the memory 320 may be a piece of memory 320 including a storage medium in the communication device, and may be a random access memory 320, a read only memory 320, a storage hard disk, and the like.
The processor 330, which may be any one or more of the processors 330 described above, may be connected to the transceiver 310 and the memory 320 via an integrated circuit bus (IIC) or the like.
The processor 330 can read the computer program from the memory 320 and execute the computer program, so as to implement the data transmission method applied to the first communication device or execute the data transmission method applied to the second communication device.
The embodiment also provides a computer storage medium, wherein the computer storage medium stores a computer program; after the computer program is executed, one or more of the cell switching methods provided by the foregoing technical solutions.
The computer storage medium may be: a mobile storage device, a Read-Only Memory (ROM or y), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. Optionally, the computer storage medium is preferably a non-transitory storage medium, or a non-volatile storage medium.
Several alternative application examples are provided below in connection with any of the embodiments described above:
example 1:
as shown in fig. 7, the present example provides a cell handover method, including:
step 0: and configuring a neighbor area table, measurement parameters and switching parameters of the distributed antenna system according to network planning, and configuring a list of target cells allowing switching of each remote unit. The list of cells allowed to be handed over may be one of the aforementioned handover indication parameters.
Step 1: a certain terminal m accesses the distributed antenna system, and triggers the measurement and report of the switching event due to the position movement, and meets the switching threshold;
step 2: the central unit demodulates the uplink SRS signal of the terminal m received by each remote unit, and judges that the remote unit n with the strongest uplink SRS signal intensity is the access remote unit of the terminal m at the moment;
and step 3: the centralized unit inquires the list of the target cells allowed to be switched in the step 0 according to the serial number n of the remote unit where the terminal m is judged to be located, and finds the list of the target cells allowed to be switched of the remote unit n;
and 4, step 4: judging whether the list of the target cells allowed to be switched of the remote unit is empty, if the list of the target cells allowed to be switched of the remote unit n is empty (for example, in step 0, the example n of the list of the target cells allowed to be switched is 2), not executing the relevant switching process, and ending;
and 5: and if the list of the target cells allowed to be switched of the remote unit n is not empty, selecting the final target cell to be switched according to the terminal measurement report and the list of the target cells allowed to be switched, and executing a subsequent switching process. Examples of the method for selecting the final handover target cell include: and the cell with the strongest RSRP in the measurement report of the corresponding terminal in the list of the allowed handover target cells.
Example 2
This example provides several examples of handover indication parameters based on the cell handover method of example 1.
In step 0, only whether each remote unit allows handover list is given, and an example of a list format of the target cells for allowing handover may be as shown in table 1:
TABLE 1 example allowed handover target cell list
Wherein the list of allowed handover target cells must be included in the neighbor list of the distributed antenna system.
In the above step 0, only whether each remote unit allows handover list is given, and an example of a list format of the target cells that can be implemented to allow handover is shown in table 2:
TABLE 2 remote Unit permission Handover List
| Numbering of remote units | Whether to allow |
| 1 | Is that |
| 2 | Whether or not |
| … | … |
| N | Is that |
Correspondingly, if the remote unit n allows handover in step 5, the final handover target cell is selected according to the terminal measurement report and the neighbor list of the distributed antenna system, and the subsequent handover procedure is executed, and the process is ended. Wherein the method of selecting the final handover target cell follows the existing strategy.
Further, it is also possible to perform statistical evaluation on the performance index (for example, handover success rate, handover times, ping-pong abnormal handover times/ratio, neighbor cell discovery times, etc.) of each remote unit in the statistical evaluation period, so as to achieve automatic optimization and adjustment of table 1 or table 2.
One possible embodiment for table 1 is as follows:
1. in the statistical evaluation period, the target cell i is deleted (or pulled into the blacklist) from the list of allowed handover target cells corresponding to the remote unit n if the following conditions are satisfied:
the number of handovers to target cell i corresponding to remote unit n > number threshold HO _ Num and
the success rate of the handover to the target cell i corresponding to the remote unit n < the probability threshold HO _ Ratio;
or
The number of handovers to target cell i corresponding to remote unit n > number threshold HO _ Num and
the abnormal handover Ratio to the target cell i corresponding to the remote unit n > the probability threshold value AbnHO _ Ratio.
2. In the statistical evaluation period, if the following conditions are satisfied, adding the target cell i into the list of the target cells allowed to be switched corresponding to the remote unit n:
the number of neighbor cell discovery times (the number of times that the handover threshold is measured and satisfied) to the target cell i corresponding to the remote unit n > the first discovery threshold (NC _ Discover).
One possible embodiment for table 2 is as follows:
1. in the statistical evaluation period, if the following conditions are satisfied, changing the field content of whether the remote unit n is allowed to switch to "no":
the number of handovers corresponding to remote unit n > number threshold (HO _ Num') and
the handover success rate < probability threshold (HO _ Ratio') for remote unit n;
or
The number of handovers corresponding to remote unit n > number threshold (HO _ Num') and
the abnormal handover Ratio corresponding to the remote unit n > the probability threshold (AbnHO _ Ratio').
2. In the statistical evaluation period, the content of the field corresponding to the remote unit n whether the handover is allowed is changed to "yes" if the following conditions are met:
the number of neighbor cell discovery times (the number of times that the handover threshold is measured and met) corresponding to the remote unit n > the first discovery threshold (NC _ Discover').
In summary, in the embodiment of the present invention, during the network planning of the distributed antenna system, a list of target cells allowing handover or a list of whether to allow handover of each remote unit is configured; judging the serial number of a remote unit where the terminal meets the switching condition based on the uplink SRS signal strength of the terminal; determining whether to allow switching and switching target cells according to the list of the target cells allowed to be switched corresponding to the sequence numbers of the remote units or whether to allow the switching list and the terminal measurement report; and automatically optimizing and adjusting the list of the allowed switching target cells or whether the list is allowed to be switched through the performance indexes of each remote unit in the statistical evaluation period.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (12)
1. A method of cell handover, comprising:
determining a remote unit currently accessed by a terminal;
querying configuration parameters of the remote unit when a handover condition is satisfied, wherein the configuration parameters at least include: a handover indication parameter; the switching indication parameter is at least used for determining whether the terminal is allowed to switch into a neighbor cell; a cell in which the neighboring cell is adjacent to a coverage area of a corresponding distal region;
determining whether to allow the cell switching of the terminal and/or a target cell allowing the switching according to the switching indication parameter; wherein the content of the first and second substances,
the determining the remote unit currently accessed by the terminal includes:
and determining a remote unit accessed by the terminal according to the signal strength of the uplink sounding reference signal of the terminal.
2. The method of claim 1,
the determining whether to allow the cell switching of the terminal and/or the target cell allowing the switching according to the switching indication parameter includes:
when the switching indication parameter does not comprise the cell identification of the adjacent cell or switching is forbidden, the cell switching of the terminal is forbidden;
and/or the presence of a gas in the gas,
and when the switching indication parameter comprises the cell identification of the adjacent cell or the switching permission, allowing the cell of the terminal to switch and selecting the target cell according to the cell identification.
3. The method of claim 2,
when the coverage area of the remote unit is the edge area of the current cell where the terminal is currently located, the handover indication parameter includes: cell identities of neighbor cells adjacent to the coverage area; and/or, when the coverage area of the remote unit is the center area of the current cell, the handover indication parameter does not include: cell identification of a neighbor cell;
alternatively, the first and second electrodes may be,
when the coverage area of the remote unit is the edge area of the current cell where the terminal is currently located, the switching indication parameter indicates that switching is allowed, and/or when the coverage area of the remote unit is the center area of the current cell, the switching indication parameter indicates that switching is forbidden;
wherein the edge region is located outside the central region.
4. A method according to claim 2 or 3, characterized in that the method further comprises:
receiving a measurement report reported by a terminal;
when the handover indication parameter includes a cell identifier of an adjacent cell, allowing the cell of the terminal to be handed over and selecting the target cell according to the cell identifier includes:
and selecting the target cell by combining the measurement report and the cell identifier in the switching indication parameter of the remote unit currently accessed by the terminal.
5. The method of claim 4,
selecting the target cell by combining the measurement report and the cell identifier in the handover indication parameter of the remote unit to which the terminal is currently accessed, including:
and selecting the strongest cell in Reference Signal Received Power (RSRP) in the measurement report as the target cell from the cells corresponding to the cell identification.
6. A method according to claim 1, 2 or 3, characterized in that the method further comprises:
acquiring cell switching result parameters in an evaluation period;
and updating the configuration parameters of the remote unit according to the cell switching result parameters.
7. The method of claim 6,
the updating the configuration parameters of the remote unit according to the cell switching result parameters includes:
if the switching times of the first adjacent cell corresponding to the remote unit are larger than the time threshold and the switching success rate is smaller than the probability threshold, or if the switching times of the first adjacent cell corresponding to the remote unit are larger than the time threshold and the abnormal switching ratio is larger than the abnormal threshold, deleting the cell identifier of the first adjacent cell from the switching indication parameter of the remote unit in the evaluation period.
8. The method of claim 6,
the updating the configuration parameters of the remote unit according to the cell switching result parameters includes:
if the number of times of discovering a second neighbor cell by the remote unit accessing the terminal in the evaluation period reaches a first discovery threshold, adding the cell identifier of the second neighbor cell to the handover indication parameter.
9. The method of claim 6,
the updating the configuration parameters of the remote unit according to the cell switching result parameters includes:
and if the discovery frequency of the second adjacent cell discovered by the terminal accessed by the remote unit reaches a second discovery threshold value in the evaluation period, updating the configuration parameters of the remote unit according to the cell switching result parameters.
10. A communication device, comprising:
a first determining unit, configured to determine a remote unit to which the terminal is currently connected;
a query unit, configured to query configuration parameters of the remote unit when a handover condition is satisfied, where the configuration parameters at least include: a handover indication parameter; the switching indication parameter is at least used for determining whether the terminal is allowed to switch into a neighbor cell; a cell in which the neighboring cell is adjacent to a coverage area of a corresponding distal region;
a second determining unit, configured to determine whether to allow cell handover of the terminal and/or a target cell allowed to be handed over according to the handover indication parameter; wherein the content of the first and second substances,
the first determining unit is specifically configured to determine, according to the signal strength of the uplink sounding reference signal of the terminal, a remote unit to which the terminal is accessed.
11. A communication device, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executed by the processor;
the processor is connected to the transceiver and the memory, respectively, and is configured to implement the cell handover method provided in any one of claims 1 to 9 by executing the computer program.
12. A computer storage medium storing a computer program; the computer program, when executed, is capable of implementing a cell handover method as provided in any one of claims 1 to 9.
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| WO2021051336A1 (en) * | 2019-09-19 | 2021-03-25 | Qualcomm Incorporated | Avoiding ping-pong handovers in cellular networks |
| CN110769475B (en) * | 2019-10-22 | 2021-08-24 | 京信网络系统股份有限公司 | Neighbor cell switching method and device, computer equipment and storage medium |
| CN111107596B (en) * | 2019-12-13 | 2022-07-12 | 京信网络系统股份有限公司 | Neighbor cell switching method and device, pico-base station and storage medium |
| CN111212463B (en) * | 2020-01-10 | 2022-07-12 | 京信网络系统股份有限公司 | Energy saving method and device, computer equipment and storage medium |
| WO2021226985A1 (en) * | 2020-05-15 | 2021-11-18 | Qualcomm Incorporated | Barring handover to cell for avoiding ping-pong between long term evolution cells in non-stand-alone mode |
| CN111787582A (en) * | 2020-06-30 | 2020-10-16 | 联想(北京)有限公司 | Network switching processing method and device |
| CN112203361B (en) * | 2020-10-12 | 2023-02-28 | Oppo（重庆）智能科技有限公司 | Method and device for processing radio link failure, terminal and storage medium |
| CN114423056A (en) * | 2020-10-28 | 2022-04-29 | 大唐移动通信设备有限公司 | Cell switching method, source base station and target base station |
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