CN112423345A - Cell reselection method, network side equipment and UE - Google Patents
Cell reselection method, network side equipment and UE Download PDFInfo
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- CN112423345A CN112423345A CN201910777435.XA CN201910777435A CN112423345A CN 112423345 A CN112423345 A CN 112423345A CN 201910777435 A CN201910777435 A CN 201910777435A CN 112423345 A CN112423345 A CN 112423345A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H04W36/08—Reselecting an access point
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Abstract
The invention provides a method for reselecting a cell, network side equipment and UE (user equipment), wherein the equipment comprises the following steps: for each UE which has load balancing switching, determining the load states of a target cell and a source cell of the UE; determining a first UE which enables a reflux control strategy according to the determined load state and indicating the first UE; receiving an RRC release message sent by first UE (user equipment) releasing RRC connection in a target cell, wherein the RRC release message carries an information item indicating that the target cell is preferentially connected; and when the first UE requests cell reselection, determining that the RRC connection is reestablished between the target cell and the first UE according to the information item. The invention can solve the problem that the effect of load balance is influenced by reselecting the source cell with higher access priority when the target cell reselects after the UE has load balance switching by starting the reflux control strategy and carrying the information item indicating the prior connection target cell in the RRC release message.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a cell reselection method, a network side device, and a UE.
Background
With the continuous expansion of the LTE (Long Term Evolution) network scale and the continuous improvement of the network coverage quality, the LTE network user scale increases year by year, but due to the reasons of uneven network user distribution, uncertain behavior, large difference in service habits and the like, the load levels in the wireless network range are not the same, resulting in the problem of load imbalance among different cells.
Load balancing is to maximally balance the resource utilization rate between cells in the case of ensuring the service quality of each network user, and the existing load balancing networking scenarios are divided into two categories: completely covering the scene and partially covering the scene.
As shown in fig. 1, for dual-D or dual-E layered networking, when two cells are located in the same eNB (evolved Node B or eNodeB), the same RRU (Remote Radio Unit), the same antenna and the same transmission power, it is considered to be completely the same coverage scenario; other layered construction scenes, such as the scene of partial same coverage when the transmitting power of the two cells between stations or in the stations is different; for TD-LTE (TD-SCDMA Long Term Evolution, time Division synchronous code Division multiple access-Long Term Evolution) and LTE-FDD (Long Term Evolution-Frequency Division synchronous code Division multiple access-Long Term Evolution) layered networking and layered networking of different Frequency bands in TD-LTE, whether located in the same eNB or not is considered to be a partial same coverage scene.
Under different coverage scenes, the adopted load balancing modes are different, and specifically the following steps are adopted:
1) load balancing under the same coverage scene completely, and a user migration mode in a fast switching mode is adopted, namely, the candidate balancing users can be switched to the target adjacent cells without measurement and report.
Specifically, when a load balancing period is reached, determining a candidate balancing user, and judging whether the candidate balancing user is switched to a neighboring cell to cause a high load of a neighboring cell PRB (PHYSICAL RESOURCE BLOCK) utilization rate; if yes, the user is not subjected to balanced switching, and the user is not selected as a candidate balanced user in the period; otherwise, the candidate equilibrium user is quickly switched to the target adjacent cell.
2) In the partially same-coverage scenario, the selection and switching execution of the candidate equalization users are the same as in the completely same-coverage scenario. The difference is that a candidate balancing user needs to be configured with a4 measurement based on the purpose of load balancing, and after receiving an a4 measurement report from the terminal, the base station determines whether the candidate balancing user is switched to the neighboring cell and causes high uplink or downlink load in the neighboring cell. If the two cells belong to different eNBs, the load information of the same coverage neighbor cell needs to be interacted through an X2 interface, and the selection strategies of the neighbor cell and the candidate balancing user are not different.
In a partial same coverage scenario, for a pair of load balancing cells with different priorities, if the load balancing switching direction is from a cell with a higher priority to a cell with a lower priority, the user with load balancing switching will switch back to the high priority source cell again through a4 measurement. To avoid this problem, the a5 load balancing ping-pong suppression measure was added. The suppression strategy matched with the A5 measurement event can avoid triggering the coverage-based back switch after the switch of load balancing occurs to a certain extent.
However, in the completely same coverage and partially same coverage scenarios, for a user whose source cell is a high-priority cell, if the user is switched from the high-priority cell to a low-priority cell and when the low-priority cell releases connection and enters an idle state, the user will reselect the source cell with a higher access priority according to the current cell reselection scheme, which may affect the load balancing effect.
Disclosure of Invention
The invention provides a cell reselection method, network side equipment and UE (user equipment), which are used for solving the problem that the effect of load balancing is influenced by reselecting a source cell with higher access priority when a target cell reselects after the UE is subjected to load balancing switching.
In a first aspect, the present application provides a method for cell reselection, including:
for each UE which has load balancing switching, determining the load states of a target cell and a source cell of the UE;
determining a first UE which enables a reflux control strategy according to the determined load state and indicating the first UE;
receiving an RRC release message sent by the first UE for releasing RRC connection in a target cell, wherein the RRC release message carries an information item indicating that the target cell is preferentially connected;
and when the first UE requests cell reselection, determining that the RRC connection is reestablished between the target cell and the first UE according to the information item.
Optionally, the RRC release message includes idle mobility control information, and a frequency point priority list in the idle mobility control information carries an information item indicating a preferred connection target cell.
Optionally, the content in the information item indicating the target cell for preferential connection is that the priority of the UE accessing the target cell is higher than the priority of the UE accessing the source cell.
Optionally, requesting, at the first UE, cell reselection, and determining to reestablish RRC connection between the target cell and the first UE according to the information item, includes:
and when the first UE requests cell reselection and the time length from the current moment to the time length of receiving the RRC release message is not longer than the set time length, determining to reestablish RRC connection between the target cell and the first UE according to the information item.
Optionally, if the time length from the current time to receiving the RRC release message exceeds the set time length, cell reselection is performed according to the priority of the cell frequency point and the pilot frequency point broadcasted in the cell system information.
Optionally, according to the determined load status, a second UE not enabling a reflux control policy is determined and indicated.
Optionally, when the second UE that releases the RRC connection in the target cell requests cell reselection, a cell with a high priority is selected according to the priority of the target cell frequency point and the pilot frequency point broadcast in the cell system information.
Optionally, determining the load states of the target cell and the source cell of each UE that performs load balancing handover includes:
and when the backflow control switch is determined to be turned on, determining the load states of the target cell and the source cell of each UE subjected to load balancing switching.
Optionally, determining the load states of the target cell and the source cell of the UE includes:
determining the load state of a target cell based on the number of users of the target cell or the number of users of the target cell and the uplink/downlink equivalent PRB occupancy rate;
and determining the load state of the source cell based on the number of users of the source cell or the number of users of the source cell and the uplink/downlink equivalent PRB occupancy rate.
Optionally, determining a first UE that enables a reflux control policy and indicating the first UE includes:
and indicating the first UE to start a reflux control strategy through a reflux control identifier.
In a second aspect, the present application provides a method for a UE to perform cell reselection, the method including:
receiving an indication whether a backflow control strategy is started or not from a target cell after load balancing switching occurs;
when releasing RRC connection, when determining to start a reflux control strategy according to the indication, sending an RRC release message carrying an information item indicating that the target cell is preferentially connected to the target cell;
and when determining that the cell reselection is needed, initiating a cell reselection process to perform the cell reselection.
Optionally, the RRC release message includes idle mobility control information, and a frequency point priority list in the idle mobility control information carries an information item indicating a preferred connection target cell.
Optionally, the content in the information item indicating the target cell for preferential connection is that the priority of the UE accessing the target cell is higher than the priority of the UE accessing the source cell.
Optionally, when releasing the RRC connection and determining that the backflow control policy is not enabled according to the indication, the cell reselection is performed according to the priority of the cell frequency point and the pilot frequency point broadcast in the cell system information.
In a third aspect, the present application provides a network side device, including:
the load module is used for determining the load states of a target cell and a source cell of each UE subjected to load balancing switching;
the first indication module is used for determining a first UE which enables a backflow control strategy according to the determined load state and indicating the first UE;
a receiving module, configured to receive an RRC release message sent by the first UE that releases RRC connection in a target cell, where the RRC release message carries an information item indicating that the target cell is preferentially connected;
and the first reselection module is used for determining that the RRC connection is reestablished between the target cell and the first UE according to the information item when the first UE requests the cell reselection.
In a fourth aspect, the present application provides a user equipment UE, including:
the second indication module is used for receiving an indication whether a backflow control strategy is started or not from the target cell after the load balancing switching occurs;
a sending module, configured to send, to the target cell, an RRC release message carrying an information item indicating that the target cell is preferentially connected when determining to enable the reflux control policy according to the indication when releasing the RRC connection;
and the second reselection module is used for initiating a cell reselection process to perform cell reselection when cell reselection is determined to be required.
In a fifth aspect, the present application provides a network side device, including: a memory, a processor;
wherein the memory is used for storing programs;
the processor is used for executing the program in the memory and comprises the following steps:
for each UE which has load balancing switching, determining the load states of a target cell and a source cell of the UE;
determining a first UE which enables a reflux control strategy according to the determined load state and indicating the first UE;
receiving an RRC release message sent by the first UE for releasing RRC connection in a target cell, wherein the RRC release message carries an information item indicating that the target cell is preferentially connected;
and when the first UE requests cell reselection, determining that the RRC connection is reestablished between the target cell and the first UE according to the information item.
In a sixth aspect, the present application provides a user equipment UE, including: a memory, a processor;
wherein the memory is used for storing programs;
the processor is used for executing the program in the memory and comprises the following steps:
receiving an indication whether a backflow control strategy is started or not from a target cell after load balancing switching occurs;
when releasing RRC connection, when determining to start a reflux control strategy according to the indication, sending an RRC release message carrying an information item indicating that the target cell is preferentially connected to the target cell;
and when determining that the cell reselection is needed, initiating a cell reselection process to perform the cell reselection.
In a seventh aspect, the present application further provides a computer storage medium having a computer program stored thereon, which when executed by a processing unit, performs the steps of the method of the first aspect.
In addition, for technical effects brought by any one implementation manner of the second aspect to the seventh aspect, reference may be made to technical effects brought by different implementation manners of the first aspect, and details are not described here.
The method for reselecting the cell, the network side equipment and the UE have the following beneficial effects that:
the cell reselection method, the network side equipment and the UE provided by the invention can determine whether to start a reflux control strategy for the UE according to the load states of the target cell and the source cell, for the UE which starts the reflux control strategy, an information item indicating that the target cell is preferentially connected is carried in an RRC release message, and when the UE performs cell reselection, the UE determines to reestablish RRC connection between the target cell and the first UE according to the information item. The method solves the problem that the effect of load balancing is influenced by reselecting the source cell with higher access priority when the target cell reselects after the UE is subjected to load balancing switching.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic view illustrating a classification of a load balancing networking scenario according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a cell reselection method according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a cell reselection method according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a method for performing cell reselection by a UE according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a network-side device according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a UE according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a network-side device according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a user equipment UE according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
For convenience of understanding, terms referred to in the embodiments of the present invention are explained below:
load balancing: under the condition of ensuring the service quality of each user, the balance of the resource utilization rate among the cells is realized to the maximum extent, the maximization of the resource utilization is realized, and the occurrence of unnecessary expansion or network congestion is avoided.
The application scenario described in the embodiment of the present invention is for more clearly illustrating the technical solution of the embodiment of the present invention, and does not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by a person skilled in the art that with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems. In the description of the present invention, the term "plurality" means two or more unless otherwise specified.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a completely same-coverage scene and a partially same-coverage scene, for each UE (User Equipment) that has undergone load balancing handover, when a target cell releases connection and enters an idle state, a source cell with a higher access priority is reselected according to a current cell reselection scheme, thereby affecting the load balancing effect.
In view of the foregoing problems, an embodiment of the present invention provides a method for cell reselection, as shown in fig. 2, including:
s201, for each UE subjected to load balancing switching, determining the load states of a target cell and a source cell of the UE;
and after detecting that the high-priority frequency point cell is in high load, performing load balancing switching, and switching each UE of the high-priority frequency point cell to a low-priority frequency point cell, wherein the low-priority frequency point cell is a target cell, and the high-priority frequency point cell is a source cell.
Under the completely same coverage scene, each UE which has load balancing switching adopts a fast switching mode to switch users, a target cell and a source cell are in the same base station, whether the UE is switched to the target cell to cause high load of the target cell is judged before switching, and if the UE causes high load of the target cell, the load balancing switching is not carried out.
Under the partially same coverage scene, the target cell and the source cell of each UE with load balancing handover may belong to the same base station, or may belong to different base stations. If the UE belongs to the same base station, the user is switched by adopting a fast switching mode, the UE needing load balancing switching needs to be configured with A4 measurement based on the load balancing purpose, and the base station judges whether the UE is switched to the target cell to cause high load of the target cell or not after receiving an A4 measurement report of the UE.
If the target cell and the source cell of each UE subjected to load balancing handover do not belong to the same base station, the load information of the source cell and the target cell needs to be interacted through an X2 interface, and whether to perform load balancing handover is determined according to the load information interacted between the target cell and the source cell.
After the load balancing switching occurs, a backflow control switch is set in the target cell, if the backflow control switch is turned off, the steps S201 and S02 are not executed, the UE is processed according to the existing mode, if the backflow control switch is turned on, the steps S201 and S202 are executed, whether a backflow control measurement strategy is started for the UE after the load balancing switching is determined, for the UE which enables the backflow control strategy, when the UE enters a connection state from an idle state, the target cell is preferentially accessed, for the UE which does not enable the backflow control strategy, message re-sending is carried out according to the existing mode, namely, cell reselection is carried out according to the target cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
Whether the UE starts the reflux control strategy or not is indicated through different values of the reflux control identifier, when the reflux control identifier is 0, the reflux control identifier is cleared, when the reflux control identifier is other values which are not 0, the reflux control identifier is set, the other values which are not 0 can be 1 or other numbers, the reflux control identifier is not limited, if the reflux control identifier is cleared, the UE is indicated not to start the reflux control strategy, and if the reflux control identifier is set, the UE is indicated to start the reflux control strategy.
And determining the load state of the target cell by adopting the user number based on the target cell or the uplink/downlink equivalent PRB occupancy rate.
When a load balancing switch based on the number of users in a target cell is turned on, if the number of users in the current target cell is lower than a user number balancing threshold of the target cell, the target cell is considered to be in a low-load state, and if the number of users in the current target cell is higher than the user number balancing threshold of the target cell, the target cell is considered to be in a high-load state; or
When the equivalent PRB load balancing algorithm switch is turned on, if the uplink/downlink equivalent PRB occupancy rate of the current target cell is lower than the uplink/downlink resource recovery threshold of the target cell, the target cell is considered to be in a low-load state, and if the uplink/downlink equivalent PRB occupancy rate of the current target cell is higher than the uplink/downlink resource recovery threshold of the target cell, the target cell is considered to be in a high-load state.
And determining the load state of the source cell by adopting the user number based on the source cell or the uplink/downlink equivalent PRB occupancy rate.
When a load balancing switch based on the number of users of a source cell is turned on, if the number of users of the current source cell is lower than a user number balancing threshold of the source cell, the source cell is considered to be in a low-load state, and if the number of users of the current source cell is higher than the user number balancing threshold of the source cell, the source cell is considered to be in a high-load state; or
When the equivalent PRB load balancing algorithm switch is turned on, if the uplink/downlink equivalent PRB occupancy rate of the current source cell is lower than the uplink/downlink resource recovery threshold of the source cell, the source cell is considered to be in a low-load state, and if the uplink/downlink equivalent PRB occupancy rate of the current source cell is higher than the uplink/downlink resource recovery threshold of the source cell, the source cell is considered to be in a high-load state.
The embodiment of the invention controls the backflow control identifier through the load states of the target cell and the source cell, when the target cell is in a high load state, the backflow control identifier is cleared, when the target cell is in a low load state, the source cell is in a low load state, the backflow control identifier is cleared, and if the target cell is in a low load state, the source cell is in a high load state, and the backflow control identifier is set.
And when the UE is changed from a connection state to an idle state, determining whether to start a reflux control strategy according to the value of the reflux control identifier which is the closest to the current time.
S202, according to the determined load state, determining a first UE which enables a reflux control strategy and indicating the first UE;
and determining the load states of the target cell and the source cell of the UE, and if the target cell is in a low-load state and the source cell is in a high-load state, starting a reflux control strategy and indicating the UE.
And if the target cell and the source cell are in a low-load state, not starting a backflow control strategy, and performing cell reselection according to the target cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
And if the target cell is in a high load state, not judging the load state of the source cell, not starting a reflux control strategy, and reselecting the cell according to the priority of the target cell frequency point and the pilot frequency point broadcasted in the cell system information.
If the target cell and the source cell are in different base stations, the target cell cannot acquire the configuration of the source cell and cannot determine the load state of the source cell, and at this time, the load information of the coverage adjacent cell is interacted through an X2 interface. When the source cell reaches the high-load early warning threshold, an X2 resource interaction process is initiated to the target cell, and if the target cell receives a resource status req message sent by the source cell, the source cell is considered to be in a high-load state.
Determining a first UE enabling a reflux control strategy and indicating the first UE, comprising:
if the reflux Control strategy is started, indicating the UE to establish RRC (Radio Resource Control) connection with the target cell again;
and if the backflow control strategy is not started, the UE selects the cell with high priority according to the cell frequency point and the pilot frequency point priority broadcasted in the cell system information when the target cell releases the RRC connection for cell reselection.
S203, receiving an RRC release message sent by the first UE for releasing RRC connection in a target cell, wherein the RRC release message carries an information item indicating a priority connection target cell;
and the UE which determines to enable the backflow control strategy is called a first UE, and the first UE releases the RRC connection in the target cell and sends an RRC release message to the target cell.
When the UE under the target cell enters an idle state from a connected state, the UE sends an RRC release message to the target, wherein the RRC release message carries idle state Mobility control information idleModemobility control Info, and a frequency point priority list in the idle state Mobility control information carries an information item indicating that the target cell is preferentially connected.
The content in the information item indicating the priority connection target cell is that the priority of the UE accessing the target cell is higher than the priority of the UE accessing the source cell.
S204, when the first UE requests cell reselection, the RRC connection is determined to be reestablished between the target cell and the first UE according to the information item.
And when the first UE requests cell reselection, determining that the time length from the current moment to receiving the RRC release message does not exceed the set time length, and determining to reestablish RRC connection between the target cell and the first UE according to the information item.
And re-establishing the RRC connection between the target cell and the first UE when the time length from the current time to the RRC release message receiving is determined not to exceed the time length set by the T320 timer through configuring the time length set by the T320 timer.
And if the time length from the current moment to the time when the RRC release message is received exceeds the set time length of the T320 timer, carrying out cell reselection according to the cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
And when the second UE releases RRC connection in a target cell for cell reselection, selecting a cell with high priority according to the cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
The following describes a specific method for reselecting a cell with reference to fig. 3, including:
s301, switching the UE of the high-priority frequency point cell to a low-priority frequency point cell based on load balance;
the high priority cell is a source cell, and the low priority cell is a target cell.
S302, judging whether a target cell backflow control switch is turned on, if so, executing a step S303, and if not, executing a step S311;
s303, judging whether a target cell is switched on based on an equivalent PRB load balancing algorithm switch, if so, executing a step S304, and if not, executing a step S305;
s304, judging whether the up/down equivalent PRB occupancy rate of the target cell is lower than the up/down resource recovery threshold of the target cell, if so, executing the step S305, and if not, executing the step S311;
when the equivalent PRB load balancing algorithm switch is turned on, if the uplink/downlink equivalent PRB occupancy rate of the current target cell is lower than the uplink/downlink resource recovery threshold of the target cell, the target cell is considered to be in a low-load state, and if the uplink/downlink equivalent PRB occupancy rate of the current target cell is higher than the uplink/downlink resource recovery threshold of the target cell, the target cell is considered to be in a high-load state.
S305, judging whether the number of users in the target cell is lower than the user number balance threshold of the target cell, if so, executing a step S306, and if not, executing a step S311;
and if the number of the users of the current target cell is lower than the user number balance threshold of the target cell, the target cell is considered to be in a low-load state, and if the number of the users of the current target cell is higher than the user number balance threshold of the target cell, the target cell is considered to be in a high-load state.
S306, judging whether the target cell and the source cell are in the same base station, if so, executing a step S307, and if not, executing a step S308;
s307, determine whether the target cell receives a resource status req message sent by the source cell, if so, execute step S312, and if not, execute step S311.
S308, judging whether a source cell is switched on or not based on an equivalent PRB load balancing algorithm switch, if so, executing the step S309, and if not, executing the step S310;
s309, judging whether the uplink/downlink equivalent PRB occupancy rate of the source cell is lower than the uplink/downlink resource recovery threshold of the source cell, if so, executing the step S310, and if not, executing the step S311;
when the equivalent PRB load balancing algorithm switch is turned on, if the uplink/downlink equivalent PRB occupancy rate of the current source cell is lower than the uplink/downlink resource recovery threshold of the source cell, the source cell is considered to be in a low-load state, and if the uplink/downlink equivalent PRB occupancy rate of the current source cell is higher than the uplink/downlink resource recovery threshold of the source cell, the source cell is considered to be in a high-load state.
S310, judging whether the number of users of the source cell is lower than a user number balance threshold of the source cell, if so, executing a step S312, and if not, executing a step S311;
and if the number of the users of the current source cell is lower than the user number balance threshold of the source cell, the source cell is considered to be in a low-load state, and if the number of the users of the current source cell is higher than the user number balance threshold of the source cell, the source cell is considered to be in a high-load state.
S311, resetting the reflux control identifier;
s312, the flow control flag is set.
If the backflow control identifier is set, indicating the UE to start a backflow control strategy and reestablishing RRC connection with the target cell;
and if the backflow control identifier is cleared, indicating the UE not to start a backflow control strategy, and when the UE releases the RRC connection in the target cell to reselect the cell, selecting the cell with high priority according to the cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
An embodiment of the present invention provides a method for a UE to perform cell reselection, as shown in fig. 4, including:
s401, after the load balance switching, receiving an indication whether to start a reflux control strategy from a target cell;
s402, when releasing RRC connection and determining to start a reflux control strategy according to the indication, sending an RRC release message carrying an information item indicating a priority connection target cell to the target cell;
and S403, when determining that the cell reselection is needed, initiating a cell reselection process to perform the cell reselection.
And the source cell where the UE is located is in high load, and the UE is switched to the target cell in a load balancing mode.
The target cell determines whether to enable the backflow control strategy according to the load states of the target cell and the source cell, and the method for determining the load states of the target cell and the source cell is the same as that described above and is not described herein again.
And if the UE receives the indication of starting the reflux control strategy, sending an RRC release message carrying an information item indicating the priority connection target cell to the target cell when the RRC connection is released.
The RRC release message comprises idle state mobility control information, and a frequency point priority list in the idle state mobility control information carries an information item indicating a priority connection target cell.
The content in the information item indicating the target cell for preferential connection is that the priority of the UE accessing the target cell is higher than the priority of the access source cell, and specifically, the information may be indicated by using a specific content, for example, using the identifier 1 to indicate that the priority of the UE accessing the target cell is higher than the priority of the access source cell.
When determining that cell reselection is needed, that is, when the UE changes from the connected state to the idle state, initiating a cell reselection process to perform cell reselection, where the cell reselection process is an existing process and is not repeated here.
And when the RRC connection is released and the backflow control strategy is not started according to the indication, cell reselection is carried out according to the cell frequency point and the different frequency point priority broadcasted in the cell system information.
Referring to fig. 5, a network side device is illustrated, which includes:
a load module 501, configured to determine, for each UE that performs load balancing handover, load states of a target cell and a source cell of the UE;
a first indicating module 502, configured to determine a first UE enabling a reflux control policy according to the determined load status and indicate the first UE;
a receiving module 503, configured to receive an RRC release message sent by the first UE that releases RRC connection in a target cell, where the RRC release message carries an information item indicating that the target cell is preferentially connected;
a first reselection module 504, configured to determine, according to the information item, to reestablish the RRC connection with the first UE in the target cell when the first UE requests cell reselection.
Optionally, the receiving module is configured to include idle mobility control information in the RRC release message, and a frequency point priority list in the idle mobility control information carries an information item indicating a preferred connection target cell.
Optionally, the receiving module is configured to indicate that the content in the information item for preferentially connecting to the target cell is that the priority of the UE accessing the target cell is higher than the priority of the UE accessing the source cell.
Optionally, the receiving module is configured to request cell reselection at the first UE, and determine to reestablish the RRC connection between the target cell and the first UE according to the information item, and includes:
optionally, the receiving module is configured to determine, when the first UE requests cell reselection and it is determined that a time length from a current time when receiving the RRC release message does not exceed a preset time length, reestablish RRC connection between the target cell and the first UE according to the information item.
Optionally, the receiving module is configured to perform cell reselection according to the priority of the cell frequency point and the pilot frequency point broadcasted in the cell system information if a time length from the current time to the time when the RRC release message is received exceeds a set time length.
Optionally, the receiving module is configured to determine a second UE that does not enable the reflux control policy according to the determined load status, and indicate the second UE.
Optionally, the receiving module is configured to select a cell with a higher priority according to the priority of the target cell frequency point and the pilot frequency point broadcast in the cell system information when the second UE that releases the RRC connection in the target cell requests cell reselection.
Optionally, the load module is configured to determine, for each UE that performs load balancing handover, load states of a target cell and a source cell of the UE, where the load states include:
and when the backflow control switch is determined to be turned on, determining the load states of the target cell and the source cell of each UE subjected to load balancing switching.
Optionally, the load module is configured to determine load states of a target cell and a source cell of the UE, and includes:
determining the load state of a target cell based on the number of users of the target cell or the number of users of the target cell and the uplink/downlink equivalent PRB occupancy rate;
and determining the load state of the source cell based on the number of users of the source cell or the number of users of the source cell and the uplink/downlink equivalent PRB occupancy rate.
Optionally, the determining, by the receiving module, the first UE that enables the reflux control policy and indicating the first UE includes:
and indicating the first UE to start a reflux control strategy through a reflux control identifier.
Please refer to fig. 6 for describing a UE, which includes:
a second indication module 601, configured to receive, from the target cell, an indication of whether to enable a reflux control policy after the load balancing handover occurs;
a sending module 602, configured to send, to the target cell, an RRC release message carrying an information item indicating that the target cell is preferentially connected when determining to enable the reflux control policy according to the indication when releasing the RRC connection;
a second reselection module 603, configured to initiate a cell reselection procedure to perform cell reselection when it is determined that cell reselection is needed.
Optionally, the sending module is configured to use the RRC release message to include idle mobility control information, where a frequency point priority list in the idle mobility control information carries an information item indicating a preferred connection target cell.
Optionally, the second indicating module is configured to indicate that the content in the information item for preferentially connecting to the target cell is that the priority of the UE accessing the target cell is higher than the priority of the UE accessing the source cell.
Optionally, the second reselection module is configured to reselect the cell according to the priority of the cell frequency point and the pilot frequency point broadcast in the cell system information when it is determined that the reflux control policy is not enabled according to the indication when the RRC connection is released.
The device in the embodiment of the present application is described above from the perspective of a modular functional entity, and the device in the embodiment of the present application is described below from the perspective of hardware processing.
Referring to fig. 7, in an embodiment of the present application, a network side device includes:
a memory 701, a processor 702;
wherein the memory is used for storing programs;
the processor is used for executing the program in the memory and comprises the following steps:
for each UE which has load balancing switching, determining the load states of a target cell and a source cell of the UE;
determining a first UE which enables a reflux control strategy according to the determined load state and indicating the first UE;
receiving an RRC release message sent by the first UE for releasing RRC connection in a target cell, wherein the RRC release message carries an information item indicating that the target cell is preferentially connected;
and when the first UE requests cell reselection, determining that the RRC connection is reestablished between the target cell and the first UE according to the information item.
Optionally, the processor is configured to include idle mobility control information in the RRC release message, where a frequency point priority list in the idle mobility control information carries an information item indicating a preferred connection target cell.
Optionally, the processor is configured to indicate that the priority of the UE accessing the target cell is higher than the priority of the UE accessing the source cell, in the information item for preferentially connecting the target cell.
Optionally, the processor is configured to request cell reselection at the first UE, and determine to reestablish the RRC connection with the first UE at the target cell according to the information item, and includes:
and when the first UE requests cell reselection and the time length from the current moment to the time length of receiving the RRC release message is not longer than the set time length, determining to reestablish RRC connection between the target cell and the first UE according to the information item.
Optionally, the processor is configured to perform cell reselection according to the priority of the cell frequency point and the pilot frequency point broadcasted in the cell system information if the time length from the current time to the time when the RRC release message is received exceeds a set time length.
Optionally, the processor is configured to determine a second UE not enabling a reflux control policy according to the determined load status, and indicate the second UE.
Optionally, the processor is configured to select a cell with a higher priority according to the priority of the target cell frequency point and the pilot frequency point broadcast in the cell system information when the second UE that releases the RRC connection in the target cell requests cell reselection.
Optionally, the processor is configured to determine, for each UE that performs load balancing handover, load states of a target cell and a source cell of the UE, where the load balancing handover includes:
and when the backflow control switch is determined to be turned on, determining the load states of the target cell and the source cell of each UE subjected to load balancing switching.
Optionally, the processor is configured to determine load states of a target cell and a source cell of the UE, and includes:
determining the load state of a target cell based on the number of users of the target cell or the number of users of the target cell and the uplink/downlink equivalent PRB occupancy rate;
and determining the load state of the source cell based on the number of users of the source cell or the number of users of the source cell and the uplink/downlink equivalent PRB occupancy rate.
Optionally, the processor is configured to determine a first UE enabling a reflux control policy and indicate the first UE, and includes:
and indicating the first UE to start a reflux control strategy through a reflux control identifier.
Referring to fig. 8, in an embodiment of the present application, a user equipment UE includes:
a memory 801, a processor 802;
wherein the memory is used for storing programs;
the processor is used for executing the program in the memory and comprises the following steps:
receiving an indication whether a backflow control strategy is started or not from a target cell after load balancing switching occurs;
when releasing RRC connection, when determining to start a reflux control strategy according to the indication, sending an RRC release message carrying an information item indicating that the target cell is preferentially connected to the target cell;
and when determining that the cell reselection is needed, initiating a cell reselection process to perform the cell reselection.
Optionally, the processor is configured to use the RRC release message to include idle mobility control information, where a frequency point priority list in the idle mobility control information carries an information item indicating a preferred connection target cell.
Optionally, the processor is configured to indicate that the priority of the UE accessing the target cell is higher than the priority of the UE accessing the source cell, in the information item for preferentially connecting the target cell.
Optionally, the processor is configured to perform cell reselection according to the priority of the cell frequency point and the pilot frequency point broadcast in the cell system information when the RRC connection is released and when it is determined that the backflow control policy is not enabled according to the indication.
Embodiments of the present invention also provide a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method for satisfying cell reselection provided in the foregoing embodiments.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. 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 modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The technical solutions provided by the present application are introduced in detail, and the present application applies specific examples to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understand the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (31)
1. A method of cell reselection, the method comprising:
for each UE which has load balancing switching, determining the load states of a target cell and a source cell of the UE;
determining a first UE which enables a reflux control strategy according to the determined load state and indicating the first UE;
receiving an RRC release message sent by the first UE for releasing RRC connection in a target cell, wherein the RRC release message carries an information item indicating that the target cell is preferentially connected;
and when the first UE requests cell reselection, determining that the RRC connection is reestablished between the target cell and the first UE according to the information item.
2. The method according to claim 1, wherein the RRC release message includes idle state mobility control information, and the frequency point priority list in the idle state mobility control information carries an information item indicating a target cell for preferential connection.
3. The method of claim 1, wherein the information item indicating the target cell for preferential connection comprises that the priority of the UE accessing the target cell is higher than that of the UE accessing the source cell.
4. The method of claim 1, wherein requesting cell reselection at the first UE, and wherein determining that the RRC connection is reestablished at the target cell with the first UE based on the information item comprises:
and when the first UE requests cell reselection and the time length from the current moment to the time length of receiving the RRC release message is not longer than the set time length, determining to reestablish RRC connection between the target cell and the first UE according to the information item.
5. The method of claim 4, comprising:
and if the time length from the current moment to the time when the RRC release message is received exceeds the set time length, carrying out cell reselection according to the target cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
6. The method of claim 1, further comprising:
and according to the determined load state, determining a second UE which does not enable a backflow control strategy and indicating the second UE.
7. The method of claim 1 or 6, further comprising:
and when the second UE of the target cell releasing the RRC connection requests cell reselection, selecting a cell with high priority according to the target cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
8. The method of claim 1, wherein determining the load status of the target cell and the source cell of each UE with load balancing handover comprises:
and when the backflow control switch is determined to be turned on, determining the load states of the target cell and the source cell of each UE subjected to load balancing switching.
9. The method of claim 1, wherein determining the load status of the target cell and the source cell of the UE comprises:
determining the load state of a target cell based on the number of users of the target cell or the number of users of the target cell and the uplink/downlink equivalent PRB occupancy rate;
and determining the load state of the source cell based on the number of users of the source cell or the number of users of the source cell and the uplink/downlink equivalent PRB occupancy rate.
10. The method of claim 1, wherein determining a first UE that enables a reflux control policy and indicating the first UE comprises:
and indicating the first UE to start a reflux control strategy through a reflux control identifier.
11. A method for a UE to perform cell reselection, the method comprising:
receiving an indication whether a backflow control strategy is started or not from a target cell after load balancing switching occurs;
when releasing RRC connection, when determining to start a reflux control strategy according to the indication, sending an RRC release message carrying an information item indicating that the target cell is preferentially connected to the target cell;
and when determining that the cell reselection is needed, initiating a cell reselection process to perform the cell reselection.
12. The method according to claim 11, wherein the RRC release message includes idle state mobility control information, and wherein a frequency point priority list in the idle state mobility control information carries an information item indicating a target cell for preferential connection.
13. The method of claim 11, wherein the information item indicating the target cell for preferential connection comprises that the priority of the UE accessing the target cell is higher than the priority of the UE accessing the source cell.
14. The method of claim 11, further comprising:
and when the RRC connection is released and the backflow control strategy is not started according to the indication, cell reselection is carried out according to the cell frequency point and the different frequency point priority broadcasted in the cell system information.
15. A network-side device, comprising: a memory, a processor;
wherein the memory is used for storing programs;
the processor is used for executing the program in the memory and comprises the following steps:
for each UE which has load balancing switching, determining the load states of a target cell and a source cell of the UE;
determining a first UE which enables a reflux control strategy according to the determined load state and indicating the first UE;
receiving an RRC release message sent by the first UE for releasing RRC connection in a target cell, wherein the RRC release message carries an information item indicating that the target cell is preferentially connected;
and when the first UE requests cell reselection, determining that the RRC connection is reestablished between the target cell and the first UE according to the information item.
16. The apparatus according to claim 15, wherein the RRC release message includes idle mobility control information, and the frequency point priority list in the idle mobility control information carries an information item indicating a target cell for preferential connection.
17. The apparatus of claim 15, wherein the information item indicating the target cell for preferential connection comprises information indicating that the UE has a higher priority for accessing the target cell than for accessing the source cell.
18. The apparatus of claim 15, wherein requesting cell reselection at the first UE, and wherein determining from the information item that the RRC connection is reestablished at the target cell with the first UE, comprises:
and when the first UE requests cell reselection and the time length from the current moment to the time length of receiving the RRC release message is not longer than the set time length, determining to reestablish RRC connection between the target cell and the first UE according to the information item.
19. The apparatus of claim 18, comprising:
and if the time length from the current moment to the time when the RRC release message is received exceeds the set time length, carrying out cell reselection according to the target cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
20. The apparatus of claim 15, further comprising:
and according to the determined load state, determining a second UE which does not enable a backflow control strategy and indicating the second UE.
21. The apparatus of claim 15 or 20, further comprising:
and when the second UE of the target cell releasing the RRC connection requests cell reselection, selecting a cell with high priority according to the target cell frequency point and the pilot frequency point priority broadcasted in the cell system information.
22. The apparatus of claim 15, wherein for each UE with a load balancing handover, determining the load status of the target cell and the source cell of the UE comprises:
and when the backflow control switch is determined to be turned on, determining the load states of the target cell and the source cell of each UE subjected to load balancing switching.
23. The apparatus of claim 15, wherein determining the load status of the target cell and the source cell of the UE comprises:
determining the load state of a target cell based on the number of users of the target cell or the number of users of the target cell and the uplink/downlink equivalent PRB occupancy rate;
and determining the load state of the source cell based on the number of users of the source cell or the number of users of the source cell and the uplink/downlink equivalent PRB occupancy rate.
24. The apparatus of claim 15, wherein determining a first UE that enables a reflux control policy and indicating the first UE comprises:
and indicating the first UE to start a reflux control strategy through a reflux control identifier.
25. A user terminal, UE, comprising: a memory, a processor;
wherein the memory is used for storing programs;
the processor is used for executing the program in the memory and comprises the following steps:
receiving an indication whether a backflow control strategy is started or not from a target cell after load balancing switching occurs;
when releasing RRC connection, when determining to start a reflux control strategy according to the indication, sending an RRC release message carrying an information item indicating that the target cell is preferentially connected to the target cell;
and when determining that the cell reselection is needed, initiating a cell reselection process to perform the cell reselection.
26. The UE of claim 25, wherein the RRC release message includes idle state mobility control information, and wherein a frequency priority list in the idle state mobility control information carries an information item indicating a target cell for preferential connection.
27. The UE of claim 25, wherein the information item indicating the preferred connection target cell comprises information indicating that the UE has a higher priority for accessing the target cell than for accessing the source cell.
28. The UE of claim 25, further comprising:
and when the RRC connection is released and the backflow control strategy is not started according to the indication, cell reselection is carried out according to the cell frequency point and the different frequency point priority broadcasted in the cell system information.
29. A network side device, characterized in that the network side device comprises:
the load module is used for determining the load states of a target cell and a source cell of each UE subjected to load balancing switching;
the first indication module is used for determining a first UE which enables a backflow control strategy according to the determined load state and indicating the first UE;
a receiving module, configured to receive an RRC release message sent by the first UE that releases RRC connection in a target cell, where the RRC release message carries an information item indicating that the target cell is preferentially connected;
and the first reselection module is used for determining that the RRC connection is reestablished between the target cell and the first UE according to the information item when the first UE requests the cell reselection.
30. A user equipment, UE, comprising:
the second indication module is used for receiving an indication whether a backflow control strategy is started or not from the target cell after the load balancing switching occurs;
a sending module, configured to send, to the target cell, an RRC release message carrying an information item indicating that the target cell is preferentially connected when determining to enable the reflux control policy according to the indication when releasing the RRC connection;
and the second reselection module is used for initiating a cell reselection process to perform cell reselection when cell reselection is determined to be required.
31. A computer-readable storage medium comprising computer program instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 13.
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