CN110831079B - Communication switching method and device - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/36—Reselection control by user or terminal equipment
- H04W36/362—Conditional handover
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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
- H04W36/00835—Determination 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
- H04W36/0005—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
- H04W36/00838—Resource reservation for handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a communication switching method, which comprises the following steps: the user equipment reports a first measurement report to a source base station; the user equipment receives a conditional switching instruction from a source base station, wherein the conditional switching instruction comprises information of candidate cells and switching conditions; the user equipment measures according to the measurement configuration in the condition switching mode to obtain a measurement result, wherein the measurement configuration comprises at least one of the following measurement events: D1. the neighbor cell is superior to the best cell first threshold in the candidate cell list; D2. the neighbor cell is better than the best cell in the candidate cell list by a second threshold and the serving cell is worse than a third threshold; D3. the number of candidate cells of which the measured value is inferior to the fourth threshold value is larger than the fifth threshold value; A1. the measurement value of the serving cell is better than the sixth threshold. The invention also discloses a communication switching device and a readable storage medium. By the mode, the overhead brought by reporting the measurement report can be reduced.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for communication handover.
Background
Handover is the most fundamental and important procedure in mobility management. In LTE/LTE-a, handover of user equipment is base station controlled. In NR, since a high frequency carrier and a beamforming technique are used, a change in a channel state is fast, which may cause a failure in transmitting a handover command to a user equipment from a source base station, i.e., a base station to which the user equipment is currently connected. Once this occurs, the control signaling between the ue and the base station disappears, and the ue may enter Radio Link Failure (RLF) and perform RRC reestablishment, which results in longer delay.
To solve this problem, conditional handover is proposed (which may also be referred to as autonomous handover). Conditional handover is a network configured but user equipment controlled mobility management mechanism. The conditional handover allows the source base station to send a conditional handover command to the user equipment when the channel quality is more stable than that of the source base station when the conventional handover is started, the conditional handover command includes information of a plurality of candidate cells and handover conditions, and then the user equipment can perform a handover process by itself when the handover conditions are satisfied.
For convenience of description, a period between transmission of the conditional switch instruction and failure of the conditional switch instruction in the case where switching/non-switching is actually performed is referred to as a validity period of the conditional switch. In the validity period of the condition switching, the user equipment can still perform measurement according to the current measurement configuration and report a measurement report to the source base station so that the base station can adjust the condition switching, and frequent measurement report reporting brings great expense.
Disclosure of Invention
The invention mainly solves the technical problem of providing a communication switching method and a communication switching device, which can solve the problem of high overhead caused by frequent measurement report reporting in the effective period of condition switching in the prior art.
In order to solve the above technical problem, the present invention provides a communication handover method, including: the user equipment reports a first measurement report to a source base station; the user equipment receives a conditional switching instruction from the source base station, wherein the conditional switching instruction comprises information of a candidate cell and a switching condition, and the candidate cell is selected for the user equipment by the source base station according to the first measurement report; the user equipment measures according to the measurement configuration in the conditional switching mode to obtain a measurement result, wherein the measurement configuration in the conditional switching mode comprises at least one of the following measurement events: d1: the measured value of the adjacent cell is better than the measured value of the best cell in the candidate cell list, and the difference between the measured value of the adjacent cell and the measured value of the best cell in the candidate cell list is larger than a first threshold value; d2: the measured value of the neighbor cell is better than the measured value of the best cell in the candidate cell list and the difference between the measured value of the neighbor cell and the measured value of the best cell in the candidate cell list is larger than a second threshold value, and the measured value of the serving cell is lower than a third threshold value; d3: the number of candidate cells of which the measured value is inferior to the fourth threshold value is larger than the fifth threshold value; a1: the measurement value of the serving cell is better than the sixth threshold.
In order to solve the above technical problem, the present invention provides a communication handover method, including: a source base station receives a first measurement report reported by user equipment; the source base station selects a candidate cell for the user equipment according to the measurement report; the source base station sends a conditional switching instruction to the user equipment, wherein the conditional switching instruction comprises information of candidate cells and switching conditions, and the source base station sends measurement configuration in a conditional switching mode to the user equipment, and the measurement configuration in the conditional switching mode comprises at least one of the following measurement events: d1: the measured value of the adjacent cell is better than the measured value of the best cell in the candidate cell list, and the difference between the measured value of the adjacent cell and the measured value of the best cell in the candidate cell list is larger than a first threshold value; d2: the measured value of the neighbor cell is better than the measured value of the best cell in the candidate cell list and the difference between the measured value of the neighbor cell and the measured value of the best cell in the candidate cell list is larger than a second threshold value, and the measured value of the serving cell is lower than a third threshold value; d3: the number of candidate cells of which the measured value is inferior to the fourth threshold value is larger than the fifth threshold value; a1: the measurement value of the serving cell is better than the sixth threshold.
In order to solve the above technical problem, the present invention provides a communication switching apparatus, which includes a processor and a communication circuit, wherein the processor is connected to the communication circuit, and the processor is configured to execute instructions to implement any one of the aforementioned methods.
In order to solve the above technical problem, the present invention provides a readable storage medium storing instructions that, when executed, implement any one of the methods described above.
The invention has the beneficial effects that: and after receiving the conditional switching instruction, the UE performs measurement and report according to the measurement configuration in the conditional switching mode, wherein the measurement configuration in the conditional switching mode comprises at least one of measurement events D1, D2, D3 and A1. The measurement events can meet at least part of the requirements of the base station for adjusting the condition switching, and compared with the current A2-A6 measurement events, the probability that the measurement events D1, D2 and D3 are triggered is lower, and the overhead brought by the reporting of the measurement report is reduced.
Drawings
Fig. 1 is a flowchart illustrating a first embodiment of a communication handover method according to the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of a communication handover method according to the present invention;
FIG. 3 is a flowchart illustrating a communication handover method according to a third embodiment of the present invention;
fig. 4 is a flowchart illustrating a communication handover method according to a fourth embodiment of the present invention;
fig. 5 is a flowchart illustrating a fifth embodiment of a communication handover method according to the present invention;
fig. 6 is a flowchart illustrating a sixth embodiment of a communication handover method according to the present invention;
fig. 7 is a flowchart illustrating a communication handover method according to a seventh embodiment of the present invention;
fig. 8 is a flowchart illustrating an eighth embodiment of a communication handover method according to the present invention;
fig. 9 is a flowchart illustrating a ninth embodiment of the communication handover method according to the present invention;
fig. 10 is a flowchart illustrating a tenth embodiment of the communication handover method according to the present invention;
fig. 11 is a flowchart illustrating an eleventh embodiment of a communication handover method according to the present invention;
fig. 12 is a schematic structural diagram of a first embodiment of the communication switching apparatus of the present invention;
fig. 13 is a schematic structural diagram of a second embodiment of the communication switching apparatus of the present invention;
FIG. 14 is a schematic structural diagram of a first embodiment of a readable storage medium of the present invention;
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples. Non-conflicting ones of the following embodiments may be combined with each other.
The main implementation of the first embodiment of the method for switching communication in the present invention is a user equipment, which may be fixed or mobile, and may be a cellular phone, a Personal Digital Assistant (PDA), a wireless modem, a tablet computer, a notebook computer, a cordless phone, etc. As shown in fig. 1, the present embodiment includes:
s11: and the user equipment reports the first measurement report to the source base station.
The first measurement report may also be referred to as an early measurement report. The user equipment may receive a measurement control from the source base station for indicating when to start measuring and to report the first measurement report before this step. The measurement control may be carried by RRC connection reconfiguration (RRC connection reconfiguration). The measurement configuration indicated by the measurement control may be referred to as the measurement configuration in the normal mode. The reporting of the first measurement report may be periodic or aperiodic, e.g. event triggered.
The trigger condition for an event-triggered measurement report may be referred to as a measurement event. The measurement configuration in the normal mode may include some or all of the measurement events A1-A6, the measurement events A1-A6 being shown in Table 1.
TABLE 1
In table 1, a serving cell refers to a cell currently providing service for user equipment; when the ue is in the dual connectivity state, the special Cell refers to a Primary Cell (PCell) or a Primary Secondary Cell (PSCell), and the special Cell is the PCell in other cases. The PCell works on the main frequency, the user equipment executes an initial connection establishment process or starts a connection reestablishment process in the PCell, and if the user equipment is in a double-connection state, the PCell belongs to the main node; the PSCell belongs to the secondary node, and random access is performed in the PSCell when the user equipment performs the connection reconfiguration process with synchronization.
S12: the user equipment receives a conditional handover instruction from the source base station.
The conditional switch instruction may be carried by RRC connection reconfiguration. The conditional handover command includes information of candidate cells and handover conditions, and the candidate cells are selected by the source base station for the ue according to the first measurement report. The conditional handover command includes a candidate cell list, and the list includes partial or all information of all candidate cells. The handover conditions may be the same or different for different candidate cells.
S13: and the user equipment performs measurement according to the measurement configuration in the condition switching mode to obtain a measurement result.
Since conditional handover is a network configuration but user equipment controlled mechanism, the handover decision is made by the user equipment rather than the network side during the validity period of the conditional handover. The source base station may adjust the conditional handover according to the measurement report, and the adjustment may include ending the conditional handover in advance, adding a new candidate cell, removing an unsuitable candidate cell, and the like.
In this case, the source base station does not need to acquire the serving/special/neighbor cell measurement update results provided by the a1-a6 measurement report in all cases. In fact, most a1-a6 measurement reports do not directly provide useful information to the source base station during the validity period of the conditional switch. The following analysis of whether the a1-a6 measurement event is applicable during the validity period of the condition switch is only performed with respect to the entry condition of the measurement event, except as specifically noted.
A1: advantageously, the inclusion of the a1 event measurement report may indicate that the serving cell signal quality is good enough, in which case the source base station may end the conditional handover early.
A2: useless, conditional handover has already been initiated and the user equipment, rather than the source base station, decides whether or not to perform the actual handover.
A3: the neighboring cell triggering a3 may be a possible handover target for the user equipment. However, after the conditional handover is initiated, the ue selects a handover target from the configured candidate cells in a default state. In the case where the cell most suitable as the handover target belongs to the configured candidate cell, the source base station does not need to know whether a new cell can be used as the candidate cell, and the a3 event is useless.
A4: the entry condition analysis for the a4 event is similar to the A3 event. The measurement report including the leaving condition of the a4 event may be used for the source base station to determine whether to remove the unsuitable candidate cell, however, the measurement object of the a4 event is a neighboring cell (which may be defined by a cell triggeredlist), and the number of the measurement objects is generally significantly larger than the number of the candidate cells, which may cause many useless measurement report reports, resulting in unnecessary overhead.
A5: similar to the a2 and a4 events.
A6: similar to the a3 event.
In this embodiment, after receiving the conditional switch instruction, the ue stops using the measurement configuration in the normal mode and enables the measurement configuration in the conditional switch mode (which may also be referred to as reporting configuration) to perform measurement. The measurement configuration in the conditional handover mode may be carried by the conditional handover instruction, or may be pre-configured to the ue. The measurement configuration in the conditional switching mode includes at least one of measurement events D1, D2, D3, and a1. The measurement events D1, D2, D3, and a1 and the corresponding trigger conditions are as follows:
D1. the measured value of the adjacent cell is better than the measured value of the best cell in the candidate cell list, and the difference between the measured value and the measured value is larger than a first threshold value, namely the adjacent cell is better than the first threshold value of the best cell in the candidate cell list;
D2. the measured value of the neighbor cell is better than the measured value of the best cell in the candidate cell list and the difference between the measured value of the neighbor cell and the measured value of the best cell in the candidate cell list is larger than a second threshold, and the measured value of the serving cell is inferior to a third threshold, namely the neighbor cell is better than the first threshold of the best cell in the candidate cell list and the serving cell is inferior to the third threshold;
D3. the number of candidate cells with the measured value being inferior to the fourth threshold is larger than the fifth threshold, namely the number of candidate cells with the measured value being inferior to the fourth threshold is larger than the fifth threshold;
A1. the measured value of the serving cell is better than the sixth threshold, i.e. the serving cell is better than the sixth threshold.
In the above measurement events, the measurement value is used to indicate the Quality of the Signal, and the measurement value may specifically include Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), and Signal to Interference plus Noise Ratio (SINR). The first threshold and the second threshold are relative thresholds of signal quality, and the first threshold and the second threshold may be the same or different; the third threshold is an absolute threshold of the signal quality; the fourth threshold is an absolute threshold of the signal quality; the fifth threshold is a quantity threshold; the sixth threshold is an absolute threshold for signal quality.
If the measurement result triggers at least one of the measurement events, the ue generates and reports a second measurement report including the triggered measurement event, and the source base station may adjust the conditional handover according to the second measurement report.
The triggering condition for the D1/D2 event includes that the measured value of the neighbor cell is better than the measured value of the best cell in the candidate cell list and the difference between the measured values is greater than the first/second threshold, and the best cell in the candidate cell list may be the one with the best signal quality in the candidate cell list, which means that the signal quality of the neighbor cell is better than the signal quality of all candidate cells. The neighboring cell signal quality triggering the D1/D2 event is better than the current candidate cell, is better suited as a handover target and is not a configured candidate cell. When the D1 and/or D2 event is triggered, the ue may report a second measurement report including the triggered D1 and/or D2 event, and after receiving the second measurement report, the source base station may add the neighboring cell triggering the D1 and/or D2 event as a new candidate cell, so as to ensure that the ue can handover to a suitable cell.
In the case where both D1 and D2 events are configured, and the second threshold is greater than or equal to the first threshold, the neighboring cells that triggered the D2 event must trigger the D1 event at the same time, and the D2 event can be considered as a combination of the D1 event and another trigger condition. The measurement configuration in the conditional switching mode may further include a combination of D1 events with other non-conflicting trigger conditions, such as a combination of D1 events with a special cell being worse than an absolute threshold.
The D3 event is triggered to mean that some candidate cells are no longer suitable as handover targets, the ue may report a second measurement report including the triggered D3 event, and the source base station may remove these candidate cells after receiving the second measurement report, so as to release resources reserved for the ue and reduce resource occupation. Compared with the leaving condition of A4 analyzed before, the number of the measurement objects of the D3 event is fewer and more accurate, and unnecessary overhead can be reduced. In the case that the D3 event is configured, the source base station may adjust the fourth threshold and/or the fifth threshold according to the requirements of different application scenarios, and decide the tradeoff between the measurement report overhead of the user equipment and the overhead of the reserved resources on the network side.
The triggered a1 event may mean that the signal quality of the source cell is good enough that handover is not required, the ue may report a second measurement report including the triggered a1 event, and the source base station may terminate the conditional handover earlier after receiving the second measurement report.
An example of Abstract Syntax Notation 1 (asn.1) of the D1 event, D2 event, and D3 event is as follows:
the measurement configuration in the conditional switching mode may not include at least one of the a2 event, the A3 event, the a4 event, the a5 event, and the a6 event to reduce measurement reporting overhead.
After obtaining the measurement result, the ue may determine whether the measurement result satisfies a trigger condition of a measurement event included in the measurement configuration in the condition switching mode, and if the measurement result satisfies the trigger condition of at least one measurement event, that is, the measurement result triggers at least one of the measurement events, the ue generates and reports a second measurement report including the triggered measurement event. In addition, the user equipment can judge whether the measurement value of the candidate cell in the measurement result meets the switching condition; and if so, selecting the candidate cell meeting the switching condition as the target cell and switching to the target cell by the user equipment. The generation and reporting of the second measurement report and the actual handover may not necessarily be performed. If the generation and reporting of the second measurement report and the actual handover are performed, the execution sequence between the two is not limited.
Through the implementation of this embodiment, after receiving the conditional switch instruction, the ue performs measurement and reporting according to the measurement configuration in the conditional switch mode, where the measurement configuration in the conditional switch mode includes at least one of measurement events D1, D2, D3, and a1. The measurement events can meet at least part of the requirements of the base station for adjusting the condition switching, and compared with the current A2-A6 measurement events, the probability that the measurement events D1, D2 and D3 are triggered is lower, and the overhead brought by the reporting of the measurement report is reduced.
As shown in fig. 2, the second embodiment of the communication switching method of the present invention is based on the first embodiment of the communication switching method of the present invention, and the measurement event includes a D1 event and/or a D2 event and the D1 event and/or the D2 event is triggered. This embodiment is a further extension of the first embodiment of the communication handover method of the present invention, and the same parts are not repeated here, and this embodiment includes:
s101: and the user equipment reports the first measurement report to the source base station.
S102: the user equipment receives a conditional handover instruction from the source base station.
S103: and the user equipment performs measurement according to the measurement configuration in the condition switching mode to obtain a measurement result.
The measurement configuration in the conditional switching mode includes a D1 event and/or a D2 event.
S104: the measurement result triggers a D1 event and/or a D2 event, and the user equipment generates and reports a second measurement report including the triggered D1 event and/or D2 event.
The second measurement report includes information of neighboring cells that triggered the D1 event and/or the D2 event.
S105: the user equipment receives the updated conditional handover instruction from the source base station.
The source base station adds the neighboring cells triggering the D1 event and/or the D2 event as new candidate cells into the candidate cell list and updates the conditional handover instruction. The updated conditional handover instruction includes information of the neighboring cells that triggered the D1 event and/or the D2 event.
As shown in fig. 3, the third embodiment of the communication switching method of the present invention is based on the first embodiment of the communication switching method of the present invention, wherein the measurement event includes a D3 event and a D3 event is triggered. This embodiment is a further extension of the first embodiment of the communication handover method of the present invention, and the same parts are not repeated here, and this embodiment includes:
s111: and the user equipment reports the first measurement report to the source base station.
S112: the user equipment receives a conditional handover instruction from the source base station.
S113: and the user equipment performs measurement according to the measurement configuration in the condition switching mode to obtain a measurement result.
The measurement configuration in the conditional switching mode includes the D3 event.
S114: the measurement results trigger a D3 event, and the user equipment generates and reports a second measurement report including the triggered D3 event.
The second measurement report includes information of the candidate cell that triggered the D3 event.
S115: the user equipment receives the updated conditional handover instruction from the source base station.
The source base station removes the candidate cell triggering the D3 event from the candidate cell list and updates the conditional handover instruction. The updated conditional handover instruction includes updated candidate cell information that excludes information of candidate cells that triggered the D3 event.
As shown in fig. 4, the fourth embodiment of the communication switching method of the present invention is based on the first embodiment of the communication switching method of the present invention, wherein the measurement event includes an a1 event and an a1 event is triggered. This embodiment is a further extension of the first embodiment of the communication handover method of the present invention, and the same parts are not repeated here, and this embodiment includes:
s121: and the user equipment reports the first measurement report to the source base station.
S122: the user equipment receives a conditional handover instruction from the source base station.
S123: and the user equipment performs measurement according to the measurement configuration in the condition switching mode to obtain a measurement result.
The measurement configuration in the conditional switching mode includes an a1 event.
S124: the measurement results trigger an a1 event, and the user equipment generates and reports a second measurement report including the triggered a1 event.
And the source base station determines to stop the automatic switching in advance after receiving the second measurement report.
S125: the user equipment receives a stop automatic switching instruction from the source base station.
The main execution body of the fifth embodiment of the communication switching method of the present invention is a base station, and the base station is used as a source base station in an automatic switching process, that is, a base station to which User Equipment (UE) is currently connected. The base station is connected with the core network and performs wireless communication with the user equipment to provide communication coverage for a corresponding geographic area. The base station may be a macro base station, a micro base station, a pico base station, or a home base station (femtocell). In some embodiments, a base station may also be referred to as a radio base station, access point, node B, evolved node B (eNodeB, eNB), gNB, or other suitable terminology. As shown in fig. 5, the present embodiment includes:
s21: the source base station receives a first measurement report reported by user equipment.
Before this step, the source base station may send a measurement control to the user equipment for indicating when to start measurement and to report the first measurement report. The measurement control may be carried by RRC connection reconfiguration. The measurement configuration indicated by the measurement control may be referred to as the measurement configuration in the normal mode. The reporting of the first measurement report may be periodic or aperiodic, e.g. event triggered. The measurement configuration in the normal mode may include part or all of the measurement events a1-a6, and reference may be made to the related description in the first embodiment of the communication handover method of the present invention.
S22: the source base station selects a candidate cell for the user equipment according to the first measurement report.
The first measurement report comprises the signal quality of the adjacent cells, and the source base station selects a plurality of adjacent cells as candidate cells according to the signal quality in the first measurement report. In addition to the first measurement report, the source base station may refer to the current location of the user equipment, the motion direction, the load of the candidate cell, and the like in the process of selecting the candidate cell.
S23: and the source base station sends a conditional switching instruction and measurement configuration in a conditional switching mode to the user equipment.
The conditional switch instruction may be carried by RRC connection reconfiguration. The conditional handover command includes information of the candidate cell and handover conditions. The conditional handover command includes a candidate cell list, and the list includes partial or all information of all candidate cells. The handover conditions may be the same or different for different candidate cells. The user equipment receiving the conditional switch instruction may initiate the conditional switch.
It should be noted that the sending of the measurement configuration in the conditional switching mode may be performed simultaneously with the sending of the conditional switching instruction, for example, the measurement configuration in the conditional switching mode may be carried by the conditional switching instruction, that is, the measurement configuration in the conditional switching mode is included in the conditional switching instruction. The source base station may also send the measurement configuration in the conditional switching mode first and then send the conditional switching instruction. The measurement configuration in the conditional switching mode may not be carried by the conditional switching instruction, regardless of whether the measurement configuration in the conditional switching mode is sent earlier than or simultaneously with the conditional switching instruction. The sequence of the transmission of the measurement configuration in the conditional switching mode and the execution between steps S21 and S22 is merely illustrative and is not actually limited.
The measurement configuration in the conditional switching mode includes at least one of measurement events D1, D2, D3, and a1. The detailed contents may refer to the related description in the first embodiment of the communication handover method of the present invention, and will not be repeated here.
The measurement configuration in the conditional switching mode may not include at least one of the a2 event, the A3 event, the a4 event, the a5 event, and the a6 event to reduce measurement reporting overhead.
Optionally, the source base station receives a second measurement report from the user equipment, where the second measurement report includes the triggered measurement event.
By implementing the embodiment, the source base station sends the conditional switch instruction and the measurement configuration in the conditional switch mode to the user equipment, so that the user equipment can perform measurement and report according to the measurement configuration in the conditional switch mode after receiving the conditional switch instruction. The measurement configuration in the conditional switching mode includes at least one of measurement events D1, D2, D3, and a1. The measurement events can meet at least part of the requirements of the base station for adjusting the condition switching, and compared with the current A2-A6 measurement events, the probability that the measurement events D1, D2 and D3 are triggered is lower, and the overhead brought by the reporting of the measurement report is reduced.
As shown in fig. 6, a sixth embodiment of the communication switching method of the present invention is based on the fifth embodiment of the communication switching method of the present invention, wherein the measurement event includes a D1 event and/or a D2 event, and the D1 event and/or the D2 event is triggered. This embodiment is a further extension of the fifth embodiment of the communication handover method of the present invention, and the same parts are not repeated here, and this embodiment includes:
s201: the source base station receives a first measurement report reported by user equipment.
S202: the source base station selects a candidate cell for the user equipment according to the first measurement report.
S203: and the source base station sends a conditional switching instruction and measurement configuration in a conditional switching mode to the user equipment.
The measurement configuration in the conditional switching mode includes a D1 event and/or a D2 event.
S204: the source base station receives a second measurement report including the D1 event and/or the D2 event from the user equipment.
The second measurement report includes information of neighboring cells that triggered the D1 event and/or the D2 event.
S205: the source base station completes handover preparation with the base station of the neighboring cell that triggered the D1 event and/or the D2 event.
Specifically, the source base station may send a handover request instruction to the base station of the neighboring cell. The handover request command includes information of the ue. The base station of the adjacent cell executes admission control, judges whether enough resources receive the user equipment, if so, sends a switching preparation confirmation message to the source base station and reserves the resources for the user equipment, and the switching preparation confirmation message is used for indicating the success of the admission control.
S206: and the source base station sends the updated conditional switching instruction to the user equipment.
The source base station adds the neighboring cells triggering the D1 event and/or the D2 event as new candidate cells into the candidate cell list and updates the conditional handover instruction. The updated conditional handover instruction includes information of the neighboring cells that triggered the D1 event and/or the D2 event.
As shown in fig. 7, the seventh embodiment of the communication switching method of the present invention is based on the fifth embodiment of the communication switching method of the present invention, wherein the measurement event includes a D3 event and a D3 event is triggered. This embodiment is a further extension of the fifth embodiment of the communication handover method of the present invention, and the same parts are not repeated here, and this embodiment includes:
s211: the source base station receives a first measurement report reported by user equipment.
S212: the source base station selects a candidate cell for the user equipment according to the first measurement report.
S213: and the source base station sends a conditional switching instruction and measurement configuration in a conditional switching mode to the user equipment.
The measurement configuration in the conditional switching mode includes the D3 event.
S214: the source base station receives a second measurement report from the user equipment comprising the D3 event.
The second measurement report includes information of the candidate cell that triggered the D3 event.
S215: the source base station informs the base station of the candidate cell triggering the D3 event to release the resources reserved for the user equipment.
The candidate cell triggering the D3 event is no longer suitable as a possible handover target for the user equipment and therefore does not need to continue to reserve resources for the user equipment.
S216: and the source base station sends the updated conditional switching instruction to the user equipment.
The source base station removes the candidate cell triggering the D3 event from the candidate cell list and updates the conditional handover instruction. The updated conditional handover instruction includes updated candidate cell information that excludes information of candidate cells that triggered the D3 event.
The execution sequence between this step and S215 is only illustrative, and actually, the execution sequence may be executed simultaneously or exchanged.
As shown in fig. 8, an eighth embodiment of the communication switching method of the present invention is based on the fifth embodiment of the communication switching method of the present invention, wherein the measurement event includes an a1 event and an a1 event is triggered. This embodiment is a further extension of the fifth embodiment of the communication handover method of the present invention, and the same parts are not repeated here, and this embodiment includes:
s221: the source base station receives a first measurement report reported by user equipment.
S222: the source base station selects a candidate cell for the user equipment according to the first measurement report.
S223: and the source base station sends a conditional switching instruction and measurement configuration in a conditional switching mode to the user equipment.
The measurement configuration in the conditional switching mode includes an a1 event.
S224: the source base station receives a second measurement report from the user equipment comprising the a1 event.
And the source base station determines to stop the automatic switching in advance after receiving the second measurement report.
S225: the source base station informs the base stations of the candidate cells to release the resources reserved for the user equipment.
The automatic handover is stopped and therefore the candidate cell does not need to continue to reserve resources for the user equipment.
S226: and the source base station sends an automatic switching stopping instruction to the user equipment.
The execution sequence between this step and S225 is only illustrative, and actually, the execution sequence may be executed simultaneously or exchanged.
A specific reporting procedure of the second measurement report including different measurement events is illustrated in the following with reference to the accompanying drawings, wherein the same parts as those in the foregoing embodiments are not repeated here.
As shown in fig. 9, in a ninth embodiment of the communication handover method according to the present invention, a second measurement report includes a D1 event, and the embodiment includes:
s301: the source base station sends measurement control to the user equipment.
S302: the source base station receives a first measurement report reported by user equipment.
S303: the source base station selects a candidate cell A, B, C for the user equipment.
The base station of candidate cell a is gNB a, the base station of candidate cell B is gNB B, and the base station of candidate cell C is gNB C.
S304: the source base station completes handover preparation with the gNB A.
S305: the source base station completes handover preparation with the gNB B.
S306: the source base station completes handover preparation with the gNB C.
The order of execution of S304-S306 is merely illustrative.
S307: and the source base station sends a conditional switching instruction to the user equipment.
The conditional handover command includes information of the candidate cell A, B, C, handover conditions, and measurement configuration in the conditional handover mode. The measurement configuration in the conditional switching mode includes the D1 event.
S308: and the user equipment performs measurement according to the measurement configuration in the condition switching mode to obtain a measurement result.
The measurement results include measurement values of the neighboring cell D. The base station of the neighboring cell D is the gbb D.
S309: the user device determines whether the D1 event is triggered.
The measured value of the neighboring cell D satisfies the trigger condition of the D1 event, and the D1 event is triggered.
S310: the user equipment reports a second measurement report including the D1 event to the source base station.
The second measurement report includes measurement values of the neighboring cell D.
S311: the source base station completes handover preparation with the gNB D.
S312: and the source base station sends the updated conditional switching instruction to the user equipment.
The neighbor cell D is added to the candidate cell list. The updated conditional handover instruction includes information of the candidate cell D.
As shown in fig. 10, in a tenth embodiment of the communication handover method according to the present invention, a second measurement report includes a D3 event, and the embodiment includes:
s321: the source base station sends measurement control to the user equipment.
S322: the source base station receives a first measurement report reported by user equipment.
S323: the source base station selects a candidate cell A, B, C for the user equipment.
The base station of candidate cell a is gNB a, the base station of candidate cell B is gNB B, and the base station of candidate cell C is gNB C.
S324: the source base station completes handover preparation with the gNB A.
S325: the source base station completes handover preparation with the gNB B.
S326: the source base station completes handover preparation with the gNB C.
The order of execution of S324-S326 is merely illustrative.
S327: and the source base station sends a conditional switching instruction to the user equipment.
The conditional handover command includes information of the candidate cell A, B, C, handover conditions, and measurement configuration in the conditional handover mode. The measurement configuration in the conditional switching mode includes the D3 event.
S328: and the user equipment performs measurement according to the measurement configuration in the condition switching mode to obtain a measurement result.
The measurements include measurements of the candidate cell A, B, C.
S329: the user device determines whether the D3 event is triggered.
The measured value of candidate cell C satisfies the trigger condition of the D3 event, and the D3 event is triggered.
S330: the user equipment reports a second measurement report including the D3 event to the source base station.
The second measurement report includes information of the candidate cell C.
S331: the source base station informs the gNB C to release the resources reserved for the user equipment.
S332: and the source base station sends the updated conditional switching instruction to the user equipment.
The updated conditional handover instruction does not include information of the candidate cell C.
As shown in fig. 11, in an eleventh embodiment of the communication handover method of the present invention, a second measurement report includes an event a1, and the embodiment includes:
s341: and the source base station sends measurement configuration under the measurement control and condition switching mode to the user equipment.
The measurement configuration in the conditional switching mode includes an a1 event.
S342: the source base station receives a first measurement report reported by user equipment.
S343: the source base station selects a candidate cell A, B, C for the user equipment.
The base station of candidate cell a is gNB a, the base station of candidate cell B is gNB B, and the base station of candidate cell C is gNB C.
S344: the source base station completes handover preparation with the gNB A.
S345: the source base station completes handover preparation with the gNB B.
S346: the source base station completes handover preparation with the gNB C.
The order of execution of S344-S346 is merely illustrative.
S347: and the source base station sends a conditional switching instruction to the user equipment.
The conditional handover command includes information of the candidate cell A, B, C and handover conditions.
S348: and the user equipment performs measurement according to the measurement configuration in the condition switching mode to obtain a measurement result.
The measurement results include measurement values of the serving cell.
S349: the user equipment determines whether an a1 event is triggered.
The measurement value of the serving cell satisfies the trigger condition of the a1 event, and the a1 event is triggered.
S350: the user equipment reports a second measurement report including the a1 event to the source base station.
The second measurement report includes a measurement value of the serving cell.
S351: the source base station informs the gNB a, B, C to release the resources reserved for the user equipment.
S352: and the source base station sends an automatic switching stopping instruction to the user equipment.
As shown in fig. 12, the first embodiment of the communication switching apparatus of the present invention includes: processor 110 and communication circuit 120, communication circuit 120 is connected to processor 110.
The communication circuit 120 is used for transmitting and receiving user data, and is an interface for the communication switching apparatus to communicate with other communication devices.
The processor 110 controls the operation of the communication switching device, and the processor 110 may also be referred to as a Central Processing Unit (CPU). The processor 110 may be an integrated circuit chip having signal processing capabilities. The processor 110 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The processor 110 is configured to execute instructions to implement the method provided by any one of the first to fourth communication handover methods of the present invention and any non-conflicting combination.
The communication switching device in this embodiment may be a user equipment, or may be a separate component, such as a baseband chip, that may be integrated in the user equipment.
As shown in fig. 13, the second embodiment of the communication switching apparatus of the present invention includes: processor 210 and communication circuit 220, communication circuit 220 is connected to processor 210.
The communication circuit 220 is used for transmitting and receiving user data, and is an interface for the communication switching device to communicate with other communication apparatuses.
The processor 210 controls the operation of the communication switching device, and the processor 110 may also be referred to as a Central Processing Unit (CPU). The processor 110 may be an integrated circuit chip having signal processing capabilities. The processor 110 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The processor 210 is configured to execute instructions to implement the method provided by any one of the fifth to eighth embodiments of the communication handover method of the present invention and any non-conflicting combinations.
The communication switching device in this embodiment may be a base station, or may be a separate component, such as a baseband board, that may be integrated into the base station.
As shown in fig. 14, the first embodiment of the storage medium readable by the present invention includes a memory 310, and the memory 310 stores instructions that, when executed, implement the method provided by any one of the first to eighth embodiments of the communication state transition method of the present invention and any non-conflicting combinations.
The Memory 310 may include a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a hard disk, an optical disk, and the like.
In the embodiments provided in the present invention, it should be understood that the disclosed method and apparatus can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
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, 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 embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, 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 an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (19)
1. A method of communication handover, comprising:
the user equipment reports a first measurement report to a source base station;
the user equipment receives a conditional handover instruction from the source base station, wherein the conditional handover instruction comprises information of candidate cells and handover conditions, and the candidate cells are selected for the user equipment by the source base station according to the first measurement report;
the user equipment measures according to the measurement configuration in the conditional switching mode to obtain the measurement result, wherein the measurement configuration in the conditional switching mode comprises any one of D1, D2 and D3 in the following measurement events or at least two of the following measurement events:
D1. the measured value of the adjacent cell is better than the measured value of the best cell in the candidate cell list, and the difference between the measured value of the adjacent cell and the measured value of the best cell in the candidate cell list is larger than a first threshold value;
D2. the measured value of the neighbor cell is better than the measured value of the best cell in the candidate cell list and the difference between the measured value of the neighbor cell and the measured value of the best cell in the candidate cell list is larger than a second threshold value, and the measured value of the serving cell is lower than a third threshold value;
D3. the number of candidate cells whose measured value is inferior to the fourth threshold is greater than the fifth threshold;
A1. the measurement value of the serving cell is better than a sixth threshold;
if the measurement result triggers any one of D1, D2 and D3 or at least two of the measurement events, the ue generates and reports a second measurement report including the triggered measurement event.
2. The method of claim 1, wherein the second measurement report comprises the D1 event and/or the D2 event;
after the user equipment generates and reports a second measurement report including the triggered measurement event, the method further includes:
the user equipment receives an updated conditional handover instruction from the source base station, the updated conditional handover instruction including information of neighboring cells triggering the D1 event and/or the D2 event.
3. The method of claim 1, wherein the second measurement report comprises the D3 event;
after the user equipment generates and reports a second measurement report including the triggered measurement event, the method further includes:
the UE receives an updated conditional handover instruction from the source base station, wherein the updated conditional handover instruction includes updated candidate cell information, and the updated candidate cell information does not include information of a candidate cell triggering the D3 event.
4. The method of claim 1, wherein the second measurement report comprises the a1 event;
after the user equipment generates and reports a second measurement report including the triggered measurement event, the method further includes:
the user equipment receives a stop automatic switching instruction from the source base station.
5. The method according to any one of claims 1-3, further comprising:
the user equipment judges whether the measurement value of the candidate cell in the measurement result meets the switching condition;
and if so, the user equipment selects the candidate cell meeting the switching condition as a target cell and switches to the target cell.
6. The method according to any one of claims 1 to 4,
the measurement configuration in the conditional switching mode does not include at least one of an a2 event, an A3 event, an a4 event, an a5 event, and an a6 event.
7. The method according to any one of claims 1 to 4,
the measurement configuration in the conditional switching mode is carried by the conditional switching instruction.
8. The method according to any one of claims 1 to 4,
before the ue performs measurement according to the measurement configuration in the conditional switching mode to obtain the measurement result, the method further includes:
the user equipment receives a measurement configuration in the conditional handover mode from the source base station.
9. The method according to any one of claims 1 to 4,
the measurements include at least one of reference signal received power, reference signal received quality, and signal to interference and noise ratio.
10. A method of communication handover, comprising:
a source base station receives a first measurement report reported by user equipment;
the source base station selects a candidate cell for the user equipment according to the first measurement report;
the source base station sends a conditional handover command to the ue, where the conditional handover command includes information of the candidate cell and handover conditions, and the source base station sends measurement configuration in a conditional handover mode to the ue, where the measurement configuration in the conditional handover mode includes any one of D1, D2, and D3 or at least two of the following measurement events:
D1. the measured value of the adjacent cell is better than the measured value of the best cell in the candidate cell list, and the difference between the measured value of the adjacent cell and the measured value of the best cell in the candidate cell list is larger than a first threshold value;
D2. the measured value of the neighbor cell is better than the measured value of the best cell in the candidate cell list and the difference between the measured value of the neighbor cell and the measured value of the best cell in the candidate cell list is larger than a second threshold value, and the measured value of the serving cell is lower than a third threshold value;
D3. the number of candidate cells whose measured value is inferior to the fourth threshold is greater than the fifth threshold;
A1. the measurement value of the serving cell is better than a sixth threshold;
the source base station receives a second measurement report from the user equipment, the second measurement report including the triggered measurement event.
11. The method of claim 10, wherein the second measurement report comprises the D1 event and/or the D2 event;
after the source base station receives the second measurement report from the user equipment, the method further comprises:
the source base station completes handover preparation with a base station of a neighboring cell that triggered the D1 event and/or the D2 event;
the source base station sends an updated conditional handover instruction to the user equipment, the updated conditional handover instruction including information of neighboring cells triggering the D1 event and/or the D2 event.
12. The method of claim 10, wherein the second measurement report comprises the D3 event;
after the source base station receives the second measurement report from the user equipment, the method further comprises:
the source base station notifies a base station of the candidate cell triggering the D3 event to release resources reserved for the user equipment, and sends an updated conditional handover instruction to the user equipment, wherein the updated conditional handover instruction includes updated candidate cell information, and the updated candidate cell information does not include information of the candidate cell triggering the D3 event.
13. The method of claim 10, wherein the second measurement report comprises the a1 event;
after the source base station receives the second measurement report from the user equipment, the method further comprises:
and the source base station informs the base station of the candidate cell to release the resource reserved for the user equipment and sends an automatic switching stopping instruction to the user equipment.
14. The method according to any one of claims 10 to 13,
the measurement configuration in the conditional switching mode does not include at least one of an a2 event, an A3 event, an a4 event, an a5 event, and an a6 event.
15. The method according to any one of claims 10 to 13,
the measurement configuration in the conditional switching mode is carried by the conditional switching instruction.
16. The method according to any one of claims 10 to 13,
the measurement configuration in the conditional switching mode is not carried by the conditional switching instruction.
17. The method according to any one of claims 10 to 13,
the measurements include at least one of reference signal received power, reference signal received quality, and signal to interference and noise ratio.
18. A communication switching apparatus, comprising a processor and a communication circuit, wherein the processor is connected to the communication circuit;
the processor is configured to execute instructions to implement the method of any one of claims 1-17.
19. A readable storage medium storing instructions that, when executed, implement the method of any one of claims 1-17.
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| PCT/CN2018/105261 WO2020029366A1 (en) | 2018-08-09 | 2018-09-12 | Handover method and apparatus |
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| CN201810903477.9A CN110831079B (en) | 2018-08-09 | 2018-08-09 | Communication switching method and device |
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| CN113784401B (en) * | 2020-06-10 | 2023-03-28 | 中国移动通信有限公司研究院 | Information sending method, receiving method and equipment |
| WO2021248505A1 (en) * | 2020-06-13 | 2021-12-16 | Qualcomm Incorporated | Base station reselection using a signal-to-noise ratio |
| WO2022011500A1 (en) * | 2020-07-13 | 2022-01-20 | 华为技术有限公司 | Configuration method and apparatus |
| CN114071598A (en) * | 2020-08-03 | 2022-02-18 | 中国移动通信有限公司研究院 | Receiving and configuring method, equipment and medium |
| CN114268977A (en) * | 2020-09-16 | 2022-04-01 | 夏普株式会社 | Radio link failure reporting method and user equipment |
| CN115038128B (en) * | 2021-03-05 | 2023-11-24 | 大唐移动通信设备有限公司 | Cell switching method, device, base station and storage medium |
| CN115942397A (en) * | 2021-08-25 | 2023-04-07 | 展讯通信（上海）有限公司 | Cell switching method, cell switching device, cell configuration method, cell configuration device, computer-readable storage medium, user equipment and network equipment |
| CN114125973B (en) * | 2021-12-01 | 2023-09-26 | Oppo广东移动通信有限公司 | Condition switching configuration removing method and device |
| WO2023184499A1 (en) * | 2022-04-01 | 2023-10-05 | Lenovo (Beijing) Limited | Methods and apparatuses for aerial user equipment signaling optimization |
| WO2023230960A1 (en) * | 2022-06-01 | 2023-12-07 | Oppo广东移动通信有限公司 | Measurement information reporting method and apparatus, measurement information receiving method and apparatus, device, and storage medium |
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