CN107911849B - Access preemption method in admission control judgment of LTE (Long term evolution) system - Google Patents

Access preemption method in admission control judgment of LTE (Long term evolution) system Download PDF

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CN107911849B
CN107911849B CN201710978917.2A CN201710978917A CN107911849B CN 107911849 B CN107911849 B CN 107911849B CN 201710978917 A CN201710978917 A CN 201710978917A CN 107911849 B CN107911849 B CN 107911849B
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access
priority
user
bearer
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CN107911849A (en
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王红娟
施渊籍
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Nanjing Panda Electronics Co Ltd
Nanjing Panda Communication Technology Co Ltd
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Nanjing Panda Electronics Co Ltd
Nanjing Panda Communication Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Abstract

The invention discloses an access preemption method in an admission control judgment of an LTE system, which comprises the following steps: counting the use condition of the current resource of the base station and judging whether the use condition meets the triggering access preemption condition; traversing all connected UEs to find UE which can be released when the condition of triggering access preemption is met; when the condition of triggering access preemption is met and UE which can be released is existed, judging whether to initiate preemption or not by selecting the service type of the UE or ARP and QCI information carried by the UE according to the object which requests access, and when the preemption can be initiated, releasing the found UE which can be released and allowing the request object to access the base station. By the method, the emergency service of the user with high priority such as VOLTE can be processed in time when the resource is limited, and the access performance and the resource utilization rate of the LTE system are improved.

Description

Access preemption method in admission control judgment of LTE (Long term evolution) system
Technical Field
The invention relates to the technical field of LTE system wireless access, in particular to an access preemption strategy in an admission control function.
Background
Due to the limitation of air interface wireless resources and hardware resources of the device, the base station can only support a certain number of users and bearers to ensure the Quality of service (QoS) of the bearers. In order to access users and bearers as many as possible on the premise of ensuring the QoS of the accessed bearers, the base station needs to perform admission control on the users requesting access and the established bearers, thereby improving the capacity and resource utilization rate of the system.
The application scenario of the admission control function is shown in fig. 1, and includes three cases, which are respectively: firstly, when a user needs to establish connection in an initial service connection in an idle state or receives a paging message, the user sends an RRC connection establishment request message to a base station, and then the base station judges whether the RRC connection can be established according to an admission control algorithm; secondly, when the core network sends a bearer establishment request or a bearer modification request to the base station, the base station judges whether the bearer carried in the message can be accepted or not according to the received message; thirdly, when the connected user is switched to the current cell from other cells, the target cell needs to make admission decision for the user.
Long Term Evolution (LTE) is a shared resource system, and all users share resources by scheduling. When there are several users with large data volume in the system, all resources may be occupied, and according to the traditional admission control strategy, other users cannot access the system, including high-priority users who need to process emergency services, are all denied access. According to the requirements of some operators, when a high-priority user such as VOLTE carries out services such as voice, the user has higher priority, and resources should be allocated preferentially.
Therefore, corresponding access preemption policies need to be respectively formulated according to the three scenarios shown in fig. 1, and when resources reach a threshold value, access preemption can be performed according to information such as service type, QCI, ARP and the like, so that the access performance and the resource utilization rate of the whole LTE system are improved within a cell load range.
Disclosure of Invention
The invention aims to support the access preemption function when a certain resource is limited in admission control judgment, thereby being capable of timely processing the emergency service of a user with high priority such as VOLTE when the resource is limited and improving the access performance and the resource utilization rate of an LTE system.
In order to solve the above problems, the present invention discloses an access preemption method in admission control decision of an LTE system, which specifically comprises:
counting the service conditions of the current resources of the base station, including the number of activated bearers, the number of connected UEs and the utilization rate of uplink and downlink PRBs; updating the utilization rate of the uplink PRB and the downlink PRB in real time;
comparing the counted current resource use condition with each resource admission control threshold value set by an operator, and judging whether the triggering access preemption condition is met;
traversing all connected UEs to find UE which can be released when the condition of triggering access preemption is met;
when meeting the condition of triggering access preemption and having UE which can be released, according to the object which requests access, selecting the service type of the UE or ARP and QCI information carried by the UE to judge whether the preemption can be initiated, and when the preemption can be initiated, releasing the found UE which can be released and allowing the request object to access the base station;
the object requesting access comprises: the method comprises the steps that a user is in initial service connection in an idle state or receives a user needing to establish connection of a paging message, a core network sending a bearing establishment or bearing modification request and a connected-state user switched to a current cell by other cells, and RRC preemption, bearing preemption and switching preemption are correspondingly triggered respectively.
As an optimal scheme, judging whether the trigger access preemption condition is met according to a trigger access preemption identifier, wherein the trigger access preemption identifier is as follows:
Figure GDA0002702936340000021
when S is equal to TRUE, the condition of triggering access preemption is met;
in the formula, NERAB、NUE、NPRB_UL、NPRB_DLRespectively representing the current activated bearing number, the number of connected UE, the utilization rate of uplink PRB and the utilization rate of downlink PRB; THERAB、THUE、THPRB_ULAnd THPRB_DLRespectively representing the maximum activated bearer number, the maximum connected UE number, the uplink PRB utilization rate threshold value and the uplink PRB utilization rate threshold value set by an operator.
As a preferred scheme, the UE that can be released refers to: the preempted and lowest priority UE is allowed.
As a preferred scheme, when RRC preemption is triggered, the priority of the UE is judged according to ARP; judging the priority of the UE according to the ARP and the QCI when triggering bearer preemption and switching preemption, and comparing the ARP first when judging the priority of the UE, and comparing the QCI again if the ARP is the same; the lower the APR value, the lower the QCI priority value, the higher the priority.
As a preferred scheme, the user allowed to be preempted refers to a connected user other than the user not allowed to be preempted, the user not allowed to be preempted includes that the UE attribute Pre-occupation continuity is not allowed to be preempted, the RRC establishment cause of the UE is either the authentication or high Priority Access or mo-VoiceCall-v1280, or the UE is marked as any one of VOLTE users.
As a preferred scheme, the condition for triggering RRC preemption is the number N of connected UEsUEReaching an admission control threshold THUE(ii) a When the conditions for triggering RRC preemption are met and UE capable of being released exists, judging whether the preemption can be initiated or not according to the RRC establishment reason, and selecting a user with low priority to execute RRC release according to the ARP; RRC establishment causes include authentication, high Priority Access, and mo-VoiceCall-v 1280.
As a preferred scheme, all UEs are accessed in the RRC connection establishment request phase, and a timer is set for each UE; when the timer is running, allowing the addition of all bearers of the UE, and judging whether the UE is a VOLTE user according to whether the bearer of the QCI1 is established; and judging whether the triggering access preemption condition is met or not after the timer is overtime.
As a preferred scheme, the timing range of the timer is 3-5S.
As a preferred scheme, the condition for triggering bearer preemption is that the number of activated bearers or the utilization rate of PRBs reaches an access threshold; and when the condition of triggering the occupation of the load is met and the UE which can be released is existed, judging whether the occupation can be initiated or not according to the priority comparison result of the ARP and QCI information of the newly-built load and the UE which can be released.
As a preferred scheme, when bearer preemption is triggered, if a user needs to be allowed to access first if the access of the user is available, and when the number of activated bearers or the utilization rate of PRBs reaches an access threshold value, if a timer in an RRC preemption stage is still running, the access of all bearers is allowed, and whether the bearer is a VOLTE user is determined according to whether the bearer of QCI1 exists; after the timer is overtime, whether RRC preemption can be initiated or not is judged according to whether the user is a VOLTE user or not; and if the UE has new bearer establishment, judging whether to perform bearer preemption according to the ARP and QCI information of the bearer.
As a preferred scheme, the condition for triggering the switching preemption is that the number of activated bearers or the utilization rate of PRBs reaches an access threshold value; and when the switching preemption condition is met and the UE capable of being released exists, judging whether to initiate preemption or not according to the priority comparison result of the ARP and QCI information of the bearer and the UE capable of being released in the switching request information.
Has the advantages that:
the invention aims at the access preemption method of the LTE system, supports the access preemption function when a certain resource is limited in admission control judgment, and can perform access preemption according to the information such as service type, QCI, ARP and the like when the resource reaches the threshold value, so that a user with high priority like VOLTE can preferentially distribute the resource when performing services such as voice and the like, and the access performance and the resource utilization rate of the LTE system are effectively improved.
Drawings
FIG. 1 is a diagram illustrating an admission control function application scenario;
FIG. 2 is a flow chart for finding lowest priority users;
fig. 3RRC preemption flow diagram;
fig. 4 is a bearer preemption flow diagram;
fig. 5 handover preemption flow chart.
Detailed Description
Before describing the embodiments, the present invention is explained by referring to terms as follows:
RRC, Radio Resource Control;
ARP, Allocation and retention priority;
QCI, QoS Class Identifier, QoS grade Identifier;
PRB, Physical Resource Block;
pre-occupation Vulnerability, preempted capability;
not pre-emptable, cannot be preempted;
the invention provides an access preemption method in an admission control decision of an LTE system, which specifically comprises the following steps:
step one, counting and updating the service conditions of the current resources of the base station in real time, wherein the service conditions comprise the number of activated bearers, the number of connected UEs and the utilization rate of uplink and downlink PRBs;
step two, comparing the resource utilization rate counted in the step one with the threshold value of each factor set by an operator, and judging whether available resources exist;
step three, when the resource utilization rate reaches a threshold value, searching a user with the lowest priority according to information such as QCI (quaternary ammonium chloride interface), ARP (address resolution protocol) and the like;
and step four, the user sends an access request to the system, and when the resource is limited, RRC preemption, bearer preemption and switching preemption are respectively carried out according to different access scenes.
Aiming at the access preemption strategy of the LTE system, the invention enables the high-priority user like VOLTE to carry out services such as voice and the like in the resource-limited environment. The access preemption is mainly carried out according to the information of the service type, the ARP, the QCI and the like, and the resources are preferentially allocated, so that the access performance and the resource utilization rate of the LTE system are effectively improved.
The invention is further described with reference to the following figures and specific embodiments.
The method comprises the following steps: counting and updating the service condition of the current resource of the base station in real time to obtain the active bearing number N at the momentERABNumber of connected UEs NUEUplink PRB utilization NPRB_ULDownlink PRB utilization NPRB_DL(ii) a And updating N in real time in a resource management systemPRB_UL，NPRB_DLAnd (4) data.
Step two: and D, comparing the resource utilization rate counted in the step I with the threshold value of each factor set by the operator, and judging whether available resources exist.
Let THERAB，THUE，THPRB_ULAnd THPRB_DLRespectively representing the maximum activated bearer number, the maximum connected UE number, and the uplink and downlink PRB utilization threshold set by the operator, whether to trigger the access preemption identifier is specifically as follows:
Figure GDA0002702936340000051
in the formula, NERAB、NUE、NPRB_UL、NPRB_DLRespectively representing the current activated bearing number, the number of connected UE, the utilization rate of uplink PRB and the utilization rate of downlink PRB; THERAB、THUE、THPRB_ULAnd THPRB_DLRespectively representing the maximum activated bearer number, the maximum connected UE number, the uplink PRB utilization rate threshold value and the uplink PRB utilization rate threshold value set by an operator.
When N is presentERAB、NUE、NPRB_UL、NPRB_DLWhen any one of the four factors reaches the corresponding threshold value, the identifier S is TRUE, and the condition of triggering access preemption is satisfied.
Step three: and when the resource reaches a threshold value, namely the access preemption identifier S is triggered to be equal to TRUE, searching the user with the lowest priority according to the ARP, QCI and other information.
And comparing the priority, comparing the ARP firstly, and comparing the QCI if the ARP is the same. The lower the APR value, the lower the QCI value, and the higher the priority. However, if the user attribute Pre-assignment continuity is Not Pre-assigned to be preempted, or the RRC establishment priority of the UE is higher, the service is more urgent (including identity, highpriority access, mo-VoiceCall-v1280), or the UE is marked as a VOLTE user, the user is Not allowed to be preempted, and the return result is null.
Referring to fig. 2, first, all connected UEs are sorted in ascending order and form a UE list. The ARP represents distribution and retention priority, and has different values, usually 0-15, and different ARP values correspond to different priorities; the QCI is a QoS grade identifier of a bearer, has different values, generally takes 1-9 values, respectively corresponds to different bearer services and also corresponds to different QCI priority values. The lower the ARP value is, the lower the QCI priority value is, the higher the priority is, and the later the UE is ranked.
Then, traversing the sorted UE list from the first UE, if the user attribute Pre-occupation Vulneravailability is Not Pre-executable, or the RRC establishment reason of the UE is error or high Priority Access or mo-VoiceCall-v1280, or the UE is marked as a VOLTE user, the user is Not allowed to be preempted, and continuing to search and compare from the next user until the user with lower Priority and allowed to be preempted is found finally, and returning to the null if the user is Not found.
Step four: the user sends an access request to the system, and when resources are limited, RRC preemption, bearer preemption, and handover preemption are respectively performed according to the three admission control application scenarios of fig. 1.
1) RRC preemption:
RRC preemption is triggered when the number of cell users reaches the admission control threshold, i.e. NUE≥THUEAnd judging whether to initiate preemption or not according to RRC establishment reasons (authentication, high Priority Access and mo-VoiceCall-v1280), wherein the preempted user selects a low-Priority user to execute RRC release according to ARP.
It should be noted that different service types correspond to different RRC establishment reasons. When the service types are an emergency call service, a high Priority Access service and a VOLTE service, the corresponding RRC establishment reasons are respectively authentication, high Priority Access and mo-VoiceCall-v1280, and at this time, the UE has a higher level and can initiate preemption.
However, at present, the RRC establishment cause cannot identify the called VOLTE, and the calling VOLTE identifies that the calling VOLTE is also newly added to the R12 protocol version by the 3GPP through the RRC establishment cause mo-VoiceCall-v1280, and is not effective for old terminals before R12. Therefore, in order to completely identify the VOLTE user, all UEs are accessed in the RRC connection establishment request phase, and then a timer is set for each UE, and the threshold determination is performed after the timer is over.
Specifically, whether the ue is a VOLTE user may be determined according to whether the bearer establishment of QCI1 is available. QCI is the QoS grade sign of bearing, has different values, and the value is 1 ~ 9 usually, corresponds different bearer service respectively, and the clear requirement of china mobile device standard, no matter VOLTE pronunciation or video all have QCI1 to bear the weight of and establish certainly, consequently, bear through QCI1 and judge whether to be VOLTE user relatively accurate. And when the number of the connected UE or the number of the activated bearers or the PRB utilization rate reaches a threshold value, releasing the user with lower priority according to the search result in the step three, and if the return result in the step three is empty, indicating that other users cannot be preempted, only releasing the user.
Wherein, the effect of timer is: in the timer time, allowing the establishment of all the bearers of the UE and identifying whether the UE is a VOLTE user; and after the timer is overtime, threshold judgment is carried out, when the resource reaches a threshold value, if the resource is a VOLTE user, preemption can be initiated, and if the resource is not the VOLTE user, the user is released. The timer is set for a time that is only required to ensure that the traffic bearer (including QCI1 bearer for VOLTE user) of the UE can be established after the RRC connection is successful within the time. But not too long, otherwise the timeliness of the preemption function is affected, and under normal conditions, the RRC connection and bearer establishment are all completed instantaneously. The reasonable value range of the timer is 3-5 s, the UE bearer can be established and completed by generally setting 3s, and the timeliness cannot be influenced by too long waiting time.
In conjunction with the RRC preemption procedure shown in fig. 3, in order to fully identify VOLTE users, all UEs are accessed in the RRC connection establishment request phase, and then a 3s timer is set for each UE.
If the timer is running, the addition of all the bearers of the UE is allowed, and when the UE establishes the bearer of QCI1, the UE is marked as a VOLTE user; and if the timer is overtime, stopping the timer and carrying out threshold judgment to judge whether to trigger the preemption flow.
When the number of connected UEs, the number of activated bearers, or the PRB utilization reaches a threshold, the following determination is made according to the search result in step three: if the returned result in the third step is not empty and the level of the request for accessing the UE is higher than the found low-priority user, the UE is successfully accessed and the low-priority user returned in the third step is released; if the returned result in the third step is empty or the priority of the UE requested to be accessed is lower, it indicates that other users cannot be preempted, at this time, only the user can be released, and the UE fails to be accessed.
2) Carrying and preempting:
when the number of active bearers or PRB utilization reaches the access threshold value, i.e. whenNERAB≥THERABOr NPRB_UL≥THPRB_ULOr NPRB_DL≥THPRB_DLAnd judging whether the occupation can be initiated or not according to information such as QCI, ARP and the like of the newly-built bearer and the searching result in the step three, selecting UE with lower priority to execute release, and if the returned result in the step three is empty, indicating that other users cannot be occupied, and only refusing the establishment of the bearer at this time.
With reference to the bearer preemption procedure shown in fig. 4, when the number of active bearers or the PRB utilization reaches the access threshold, if the timer for access preemption waiting in the RRC phase is still running, the bearer access is successful, and at this time, all bearers accessed to the UE (i.e., the UE that sets the timer) are accessed, and after the timer expires, it is determined whether to release the bearers; if the timer is overtime, the following judgment is made according to the searching result in the step three: if the returned result in the third step is not empty and the ARP and QCI levels of the request for accessing the bearer are higher than the found low-priority user, the bearer is successfully accessed and the low-priority user returned in the third step is released; if the result returned in the third step is empty or the priority of the request for accessing the bearer is lower, it indicates that other users cannot be preempted, and at this time, only the bearer access can be rejected.
It should be noted that, as mentioned above, in order to fully identify the VOLTE user, it is first necessary to allow the user to access, and all bearers are allowed to access within the timer time, and whether the VOLTE user is determined according to whether there is a bearer of QCI 1; and after the timer is overtime, threshold judgment is carried out, whether RRC preemption can be initiated or not is judged according to whether the UE is a VOLTE user or not, and if the UE has new bearer establishment, whether bearer preemption is carried out or not is judged according to bearer priority information (namely ARP and QCI information). Therefore, the preemption at this stage needs to take into account the timer set by the UE at the time of RRC preemption.
3) Switching and preempting:
when the PRB utilization rate reaches the PRB threshold value accessed due to switching, namely NPRB_UL≥THPRB_ULOr NPRB_DL≥THPRB_DLJudging whether to initiate preemption or not according to information such as QCI (quaternary Commitment identifier) and ARP (Address resolution protocol) carried in the switching request information and the searching result in the step three, and selecting priorityAnd the lower UE executes release, if the return result in the step three is null, the other users cannot be preempted, and the switching access can only be refused at the moment.
It should be noted that, from the implementation process, both handover preemption and bearer preemption are based on bearer preemption, but from the above description, it can be seen that the actual two are different processes, and the access threshold values are also different, and are not described herein again.
With reference to the handover preemption procedure shown in fig. 5, when the number of active bearers or the PRB utilization reaches the handover access threshold, the following determination is made according to the search result in step three: if the returned result in the third step is not empty and the ARP and QCI carried in the switching request information are higher than the found low-priority users, the switching access is successful, and the low-priority users returned in the third step are released; if the returned result in the third step is null or the priority carried in the switching request information is low, it indicates that other users cannot be preempted, and at this time, only the switching access can be refused.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. An access preemption method in admission control decision of an LTE system is characterized by comprising the following steps:
counting the service conditions of the current resources of the base station, including the number of activated bearers, the number of connected UEs and the utilization rate of PRBs (physical resource blocks) of uplink and downlink; updating the PRB utilization rate of the uplink and downlink physical resource blocks in real time;
comparing the counted current resource use condition with each resource admission control threshold value set by an operator, and judging whether the triggering access preemption condition is met;
traversing all connected UEs to find UE which can be released when the condition of triggering access preemption is met;
when meeting the condition of triggering access preemption and having UE which can be released, according to the object of request access, selecting the service type of UE or the distribution and retention priority ARP carried by the UE and the QCI information of the service quality grade identification to judge whether the preemption can be initiated, and when the preemption can be initiated, releasing the found UE which can be released and allowing the request object to access the base station;
the object requesting access comprises: the method comprises the following steps that a user is in initial service connection in an idle state or receives a user needing to establish connection of a paging message, a core network sending a bearer establishment or bearer modification request, and a connected-state user switched to a current cell by other cells, and respectively triggers Radio Resource Control (RRC) preemption, bearer preemption and switching preemption;
the conditions for triggering the RRC preemption are as follows: number of connected UEs NUEReaching an admission control threshold THUE(ii) a When the conditions for triggering the Radio Resource Control (RRC) preemption are met and UE capable of being released is available, judging whether the preemption can be initiated or not according to the establishment reason of the RRC, and selecting a user with low priority to execute the RRC release according to the allocation and retention priority ARP;
the conditions for triggering bearer preemption and handover preemption are as follows: activating the bearing number or the physical resource block PRB utilization rate to reach an access threshold value; when the condition of triggering the occupation of the load is met and the UE which can be released is existed, judging whether the occupation can be initiated or not according to the distribution of the newly-built load and the UE which can be released and the priority comparison result of reserving the priority ARP and the service quality grade identification QCI information; and when the switching preemption condition is met and the UE capable of being released exists, judging whether to initiate preemption or not according to the priority comparison result of the distribution of the bearer and the UE capable of being released in the switching request information, the priority ARP and the service quality grade identification QCI information.
2. The access preemption method of claim 1, wherein the access preemption trigger is determined to satisfy the access preemption conditions based on an access preemption trigger identifier that is:
Figure FDA0002775937060000021
when S is equal to TRUE, the condition of triggering access preemption is met;
in the formula, NERAB、NUE、NPRB_UL、NPRB_DLRespectively representing the current activated bearing number, the number of connected UE, the utilization rate of an uplink physical resource block PRB and the utilization rate of a downlink physical resource block PRB; THERAB、THUE、THPRB_ULAnd THPRB_DLThe maximum activated bearer number, the maximum connected UE number, the threshold value of the utilization rate of the PRB of the uplink physical resource block and the threshold value of the utilization rate of the PRB of the uplink physical resource block which are set by an operator are respectively represented.
3. The access preemption method of claim 1, wherein the UE that can be released refers to: the preempted and lowest priority UE is allowed.
4. The access preemption method of claim 3, wherein, in triggering Radio Resource Control (RRC) preemption, the priority of the UE is determined according to the allocation and retention priority ARP; when triggering bearing preemption and switching preemption, judging the priority of the UE according to the allocation and retention priority ARP and the service quality grade identification QCI, and when judging the priority of the UE, firstly comparing the allocation and retention priority ARP, and if the allocation and retention priority ARP is the same, then comparing the service quality grade identification QCI; the lower the value of the allocated and reserved priority APR is, the lower the value of the priority of the quality of service class identifier QCI is, the higher the priority is.
5. The Access preemption method of claim 3 wherein the user allowed to be preempted is a connected user except the user not allowed to be preempted, the user not allowed to be preempted comprises the UE property preempted capability Pre-occupation Vulnerability being not preempted, the RRC establishment cause of the UE is either evolution or high Priority Access or mo-VoiceCall-v1280, or the UE is marked as any one of VOLTE users.
6. The Access preemption method of claim 1, wherein the radio resource control, RRC, establishment cause comprises authentication, high Priority Access, and mo-VoiceCall-v 1280.
7. The access preemption method of claim 1, wherein all UEs are accessed in a radio resource control, RRC, connection setup request phase and a timer is set for each UE; when the timer is running, allowing the addition of all bearers of the UE, and judging whether the UE is a VOLTE user according to whether the bearer of the QCI1 is established; and after the timer is overtime, judging whether the RRC preemption condition for triggering the access of the radio resource control is met.
8. The access preemption method of claim 7, wherein the timer has a timing in the range of 3-5S.
9. The access preemption method of claim 1, wherein when triggering bearer preemption, if there is a user access first requiring to allow user access, when the number of activated bearers or the physical resource block PRB utilization reaches the access threshold, if the timer of the radio resource control RRC preemption phase is still running, allowing access of all bearers, and determining whether the bearer is a VOLTE user according to whether there is a bearer of QCI 1; after the timer is overtime, judging whether the RRC occupation can be initiated according to whether the VOLTE user is allowed or not; if the UE has a new bearer establishment, judging whether to perform bearer preemption according to the bearer allocation, the reserved priority ARP and the service quality grade identification QCI information.
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