CN103686826A - Admission control method of carrier aggregation system - Google Patents
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Abstract
The application discloses an admission control method of a carrier aggregation system. The method comprises the following steps: (A) accounting the time-frequency resource service condition on all component carriers in a cell by a base station; (B) determines whether the idle time-frequency resources on all component carriers can meet requirement for time-frequency resources of a bearer requested by a bearer admission request after receiving the bearer admission request by the base station, if yes, executing step (C), and if no, executing step (E); (C) determining whether a non-overloaded configuration component carrier exists in configuration component carriers of user equipment sending the bearer request, if yes, executing step (D), and if no, executing step (E); (D) returning admission decision success, and stopping the process; (E) returning admission decision failure, and stopping the process. The technical scheme provided by the application can avoid the problem that a bearer establishment request is refused, which is caused by lack of spare resources of individual component carriers, and can prevent new access service form influencing the service quality of existing services on some component carriers with heavy loads.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a carrier aggregation technology, and in particular, to an admission control method in a carrier aggregation system.
Background
The development of mobile communication technology has now experienced a development course from the first generation (1G), the second generation (2G), the third generation (3G), to the evolved third generation (E3G). Today, when spectrum resources are increasingly strained, how a next generation wireless communication network supports a larger bandwidth on the existing spectrum resources becomes a key factor for increasing the transmission rate of service data and enhancing the user experience, and faces a serious challenge. Currently, the third generation partnership project (3 GPP) proposes to use Carrier Aggregation (CA) technology in LTE-a to fully utilize spectrum resources scattered over multiple frequency bands to meet the requirements of new generation wireless standards for indexes such as throughput and peak rate.
The carrier aggregation technology is a key technology for supporting a larger bandwidth in a future wireless communication system, and a carrier with a larger bandwidth is formed by aggregating a plurality of discrete Component Carriers (CCs) which are continuous/discontinuous in frequency, and a User Equipment (UE) with a stronger capability is supported on the aggregated bandwidth, for example, LTE-a supports a bandwidth of 100MHz at maximum. Although each UE may use multiple component carriers, not all UEs will use all component carriers of the system, those used by the UE are called configured component carriers, unused component carriers are called non-configured component carriers, different UEs may have different configured/non-configured component carriers, and additional configured component carriers may be added to the UE through Radio Resource Control (RRC) signaling. The Set of Configured component carriers for one UE is called a Configured Set (Configured Set). The component carrier maintaining RRC connection with the UE in the configuration set is referred to as a Primary Component Carrier (PCC) or a PCell, and the carrier other than the PCC is referred to as a Secondary Component Carrier (SCC) or an SCell. PCC is always active, SCC can be activated or deactivated as needed.
Admission control is an important aspect of radio resource management, and its main task is to make admission or rejection decision on the establishment (activation or modification) request of radio bearer, and to satisfy the quality of service (QoS) required by the new access service, and at the same time, to ensure the QoS of the existing service in the network, or to minimize the impact of the new access service on the QoS of the existing service flow, so as to maintain the stability of the system and ensure the high-efficiency utilization of radio resources. To achieve this, admission control needs to consider the resource status of the entire system, the QoS status of existing traffic, and the QoS requirements of the newly requested radio bearer, etc. And when the admission control judges that the QoS of the radio bearer newly requested to be established cannot be met or the QoS requirement of the existing service can be influenced by the access of the new service, the access of the service is refused.
Since the LTE/LTE-a system employs a distributed radio resource management architecture, admission control thereof is mainly implemented in a base station (eNB). The LTE/LTE-a protocol specifies an application scenario and an interaction flow of admission control, and also explicitly defines QoS parameters for radio bearers, but the protocol does not specify an admission algorithm and a specific admission implementation process, and is designed and implemented by each eNB vendor.
For the LTE system, the admission control decision is based on the resource status of the own cell and the QoS status of the service. And when the resources of the cell can meet the QoS requirement of the new service and the admission of the service does not affect the QoS condition of the existing service, the service is permitted to be accessed, and if the conditions cannot be met, the service is forbidden to be accessed.
However, in the LTE-a system, due to the introduction of the carrier aggregation technology, the situation may be different when each component carrier has independence and is closely related to each other: on one hand, due to the introduction of the carrier aggregation technology, a plurality of CCs can be simultaneously transmitted, and admission control needs to evaluate the resource use conditions on all CCs in the whole system; on the other hand, since the UE may only transmit data on activated or configured (after activation) CCs, if the load on these CCs is too heavy, the user's bearer setup request cannot be admitted even though there are enough remaining resources on other CCs. In the LTE-a system, if the original admission control method of the LTE system is continuously used, the following problems may occur:
1. because a plurality of CCs can be simultaneously transmitted, if only the resource condition of a certain CC is considered, the resource use condition of the whole system cannot be accurately evaluated, and the bearer establishment request may be rejected due to insufficient remaining resources of individual CCs;
2. because the load conditions on the CCs are different, if each CC is not subjected to load evaluation, the new access service may affect the QoS of the existing service on some CCs with heavier loads;
3. since the SCC of the UE can be activated as needed, it may cause waste of system resources and UE capability if only the current active SCC is considered in the admission decision.
Disclosure of Invention
The application provides an admission control method in a carrier aggregation system, which can avoid the problem that a bearing establishment request is rejected because the residual resources of individual member carriers are insufficient, and prevent the influence of new access service on the service quality of the existing service on some member carriers with heavier load.
An admission control method in a carrier aggregation system provided in an embodiment of the present application includes:
A. the base station counts the use condition of time-frequency resources on all member carriers in a cell;
B. after receiving the bearer admission request, the base station judges whether idle time-frequency resources on all the member carriers can meet the time-frequency resource requirement of the bearer requested by the bearer admission request, if so, the step C is executed, otherwise, the step E is executed;
C. judging whether an un-overloaded configuration member carrier exists in the configuration member carriers of the user equipment sending the bearing request, if so, executing the step D, otherwise, executing the step E;
D. returning to the admission judgment success and ending the process;
E. returning the admission judgment failure and ending the flow.
Preferably, step C includes:
c1, selecting the main member carrier of the user equipment sending the bearing request as the current member carrier;
c2, judging whether the current member carrier is overloaded, if so, executing the step C3; otherwise, executing step D;
c3, judging whether the UE has an undetermined activated secondary member carrier, if so, executing the step C4; otherwise, go to step C5;
c4, selecting an undetermined auxiliary member carrier from the activated auxiliary member carrier list of the user as the current member carrier, and executing the step C2;
c5, judging whether the user has an undetermined inactive secondary member carrier, if yes, executing step C6; otherwise, executing step E;
c6, selecting an undetermined inactive secondary member carrier from the configured inactive secondary member carrier list of the user as the current member carrier;
c7, judging whether the current member carrier is overloaded, if so, executing the step C5; otherwise, go to step C8;
c8, activating the current member carrier, and then executing the step D.
Preferably, the step C2 and the step C7 further include: and adjusting the scheduling parameters according to a scheduling algorithm.
Preferably, the step a of the base station counting the time-frequency resource usage status on all the component carriers in the cell includes: and the base station calculates the average transmission efficiency of all the member carriers in the cell and converts the number of the admitted and borne required physical resource blocks according to the average transmission efficiency.
An embodiment of the present application further provides an admission control device in a carrier aggregation system, where the device is located in a base station device, and the admission control device includes:
the UE context module is responsible for the management and operation of the UE context and provides an interface for the UE context operation for the admission control module; the UE context includes primary member carrier information, an activated secondary member carrier list and an inactivated secondary member carrier list;
the message processing module is used for receiving a bearing admission request from user equipment and outputting the bearing admission request to the admission control module for processing; and indicating the acceptance judgment failure or acceptance judgment success from the acceptance control module to the user equipment;
the receiving control module is used for counting the use conditions of the time-frequency resources on all the member carriers in the cell, judging whether the idle time-frequency resources on all the member carriers can meet the bearing receiving request or not after receiving the bearing receiving request from the message processing module, and if not, outputting a receiving judgment failure indication to the message processing module; if yes, judging whether an un-overloaded configuration member carrier exists in the configuration member carriers of the user equipment sending the bearing request, if yes, outputting an admission judgment success indication to a message processing module, otherwise, outputting an admission judgment failure indication to the message processing module; if any member carrier is found to be overloaded in the judgment process, outputting an overload indication to a scheduling module; if the non-overloaded member carrier is the non-activated auxiliary member carrier, outputting a carrier activation instruction to a carrier management module;
the scheduling module is used for scheduling and allocating the wireless resources;
and the carrier management module is used for being responsible for adding, deleting, changing, activating and deactivating the member carriers.
According to the technical scheme, the time-frequency resource use conditions on all the member carriers are counted when admission judgment is carried out, so that whether the residual resources of the whole system can meet the bearing requirement of requesting admission or not is estimated, and the condition that a bearing establishment request is rejected due to the fact that the residual resources of individual CCs are insufficient is avoided; according to the configuration and activation conditions of the user equipment member carriers and the load conditions of the member carriers, whether the access of the request bearer affects the QoS of the established bearer or not is evaluated, and the influence of the new access service on the service quality of the existing service on some member carriers with heavier load is avoided; and outputting corresponding instructions to the carrier management and scheduling module according to the evaluation result of the load condition of each member carrier in the admission judgment process, and combining a carrier management and scheduling algorithm to be beneficial to load balancing among carriers.
Drawings
Fig. 1 is a block diagram of an admission control device in a carrier aggregation system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of an admission control method in a carrier aggregation system according to an embodiment of the present disclosure.
Detailed Description
The basic idea of the admission control method provided by the present application is to evaluate the resource usage status on all CCs in the entire system, estimate whether the remaining resources of the entire system can meet the bearer requirement of the admission request, and simultaneously evaluate whether the access of the bearer request will affect the QoS of the established bearer according to the configuration and activation status of the UE component carrier and the load conditions on these CCs, and finally decide whether to admit the bearer.
The application provides an admission control method in a carrier aggregation system, which comprises the following steps:
A. the base station counts the use condition of time-frequency resources on all member carriers in a cell;
B. after receiving the bearing admission request, the base station judges whether idle time-frequency resources on all the member carriers can meet the bearing admission request, if so, the step C is executed, otherwise, the step E is executed;
C. judging whether an un-overloaded configuration member carrier exists in the configuration member carriers of the user equipment sending the bearing request, if so, executing the step D, otherwise, executing the step E;
D. returning to the admission judgment success and ending the process;
E. returning the admission judgment failure and ending the flow.
For a carrier aggregation system, the resource possibly used for bearing is not limited to one member carrier, and the resource requirement for requesting to bear on a certain member carrier cannot be estimated, so that whether the time-frequency resource of a certain member carrier meets the bearing admission request cannot be judged, and only whether the remaining time-frequency resources on all carriers meet the bearing admission request can be judged. The purpose of the judgment in step C is to avoid the situation that the bearer which can only be transmitted on the overloaded component carrier is also accepted under the condition of unbalanced load among the component carriers. The bearer may be configured over a plurality of component carriers, but at least one of the plurality of component carriers is not overloaded.
In order to make the technical principle, characteristics and technical effects of the technical scheme of the present application clearer, the technical scheme of the present application is explained in detail with reference to specific embodiments below.
As shown in fig. 1, an admission control device in a carrier aggregation system according to an embodiment of the present application is located in a base station device, and includes: UE context module 101, message processing module 102, admission control module 103, scheduling module 104, and carrier management module 105. Wherein,
the UE context module 101: is responsible for the management and operation of UE context and provides interfaces for other modules (including but not limited to the admission control module 103) to operate on UE context. The UE context includes primary member carrier information, an activated secondary member carrier list, and an inactivated secondary member carrier list.
The message processing module 102: the system is configured to receive a bearer admission request from a user equipment, and output the bearer admission request to the admission control module 103 for processing. And an admission decision failure indication or an admission decision success indication from the admission control module 103 to the user equipment. Preferably, the message processing module 102 may output the bearer admission request to the admission control module 103 for processing according to a first-in first-out principle according to an arrival sequence of the bearer admission request from the user equipment. The message processing module 102 may also prioritize forwarding of the bearer admission request according to other principles, such as priority, etc.
The admission control module 103: the system comprises a message processing module, a receiving module and a judging module, wherein the receiving module is used for counting the use condition of time-frequency resources on all member carriers in a cell, judging whether idle time-frequency resources on all the member carriers can meet a bearing admission request or not after receiving the bearing admission request from the message processing module, and outputting an admission judgment failure indication if the idle time-frequency resources on all the member carriers can not meet the bearing admission request; if yes, judging whether an un-overloaded member carrier exists in the configured member carriers of the user equipment sending the bearing request, if yes, outputting an admission judgment success indication, and if not, outputting an admission judgment failure indication; if any member carrier is found to be overloaded in the judgment process, outputting an overload indication to a scheduling module; if the non-overloaded member carrier is the non-activated auxiliary member carrier, outputting a carrier activation instruction to a carrier management module;
the scheduling module 104: for scheduling allocation of radio resources according to a scheduling algorithm. The specific operations performed by the scheduling module 104 are related to different scheduling algorithms, for example, the scheduling algorithms may adjust resource allocation coefficients of services on different carriers or adjust priorities of the carriers. The core idea is to reduce the load on the overloaded carrier by adjusting the scheduling parameters, so as to avoid the phenomenon of unbalanced load of each carrier.
The carrier management module 105: and is responsible for adding, deleting, changing, activating and deactivating carriers.
The UE context module 101, the scheduling module 104, and the carrier management module 105 are existing functional modules, and in the technical solution of the present application, some functions are utilized, and the admission control module is a specific module in the technical solution of the present application.
An admission control method in a carrier aggregation system provided in an embodiment of the present application has a flow as shown in fig. 2, and includes the following steps:
step 201: and the base station counts the use condition of time-frequency resources on all CCs in the cell. For example, the base station may calculate an average transmission efficiency of all CCs in the cell, and convert the required Physical Resource Block (PRB) number of the admitted bearer according to the average transmission efficiency.
Step 202: after receiving the bearer admission request, the base station determines whether the idle time-frequency resources on all CCs can satisfy the bearer admission request, that is, determines whether the sum of the time-frequency resources occupied by the admitted bearer and the time-frequency resources required by the request for admission bearer is less than the total time-frequency resources available to the system, if so, executes step 203; otherwise, step 214 is performed. The bearer admission request may be a bearer establishment request or a bearer activation request, and the specific procedure for receiving the bearer admission request by the base station is described in section 8.2 of protocol 3GPP TS 36.413. The idle time-frequency resource may be the number of unused PRBs, and is obtained by subtracting the number of PRBs admitted to the bearer from the total number of PRBs.
Step 203: and selecting the main component carrier of the UE which sends the bearer admission request as the current component carrier.
Step 204: judging whether the current member carrier is overloaded, if so, executing step 205; otherwise, step 213 is performed.
Step 205: an overload indication is output to the scheduling module. And the scheduling module adjusts the scheduling parameters according to a scheduling algorithm.
Step 206: judging whether the UE has an active secondary member carrier which is not judged, if so, executing step 207; otherwise, step 208 is performed.
Step 207: an undetermined secondary component carrier is selected from the activated secondary component carrier list of the user as the current component carrier, and step 204 is executed.
Step 208: judging whether the user has an undetermined inactive secondary member carrier, if so, executing step 209; otherwise, step 214 is performed.
Step 209: and selecting an undetermined inactive secondary member carrier from the configured inactive secondary member carrier list of the user as the current member carrier. One preferred selection method is to select the inactive secondary component carrier with the best channel quality from the configured inactive secondary component carrier list.
Step 210: judging whether the current member carrier is overloaded, if so, executing step 211; otherwise, step 212 is performed.
Step 211: an overload indication is output to the scheduling module and step 208 is performed.
Step 212: and outputting a carrier activation instruction to a carrier management module to activate the current member carrier for the user.
Step 213: returning the admission judgment success and ending the flow.
Step 214: returning the admission judgment failure and ending the flow.
The admission control method in the carrier aggregation system provided by the application has the following beneficial effects:
1. counting the use conditions of time-frequency resources on all CCs during admission judgment, thereby estimating whether the residual resources of the whole system can meet the bearing requirement of requesting admission or not and avoiding that the bearing establishment request is rejected due to insufficient residual resources of individual CCs;
2. evaluating whether the access of the request bearer can influence the QoS of the established bearer according to the configuration and activation conditions of the member carriers of the UE and the load conditions on the CCs, and avoiding that the new access service influences the QoS of the existing service on the CCs with heavier loads;
3. and outputting corresponding instructions to the carrier management and scheduling module according to the evaluation result of each CC load condition in the admission judgment process, and combining a carrier management and scheduling algorithm to be beneficial to load balancing among carriers.
The scheme of the application is not only suitable for the LTE-A system, but also suitable for other wireless communication systems adopting carrier aggregation.
The above description is only a preferred embodiment of the present application and should not be taken as limiting the scope of the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the technical solution of the present application should be included in the scope of the present application.
Claims (5)
1. An admission control method in a carrier aggregation system, comprising:
A. the base station counts the use condition of time-frequency resources on all member carriers in a cell;
B. after receiving the bearer admission request, the base station judges whether idle time-frequency resources on all the member carriers can meet the time-frequency resource requirement of the bearer requested by the bearer admission request, if so, the step C is executed, otherwise, the step E is executed;
C. judging whether an un-overloaded configuration member carrier exists in the configuration member carriers of the user equipment sending the bearing request, if so, executing the step D, otherwise, executing the step E;
D. returning to the admission judgment success and ending the process;
E. returning the admission judgment failure and ending the flow.
2. The method of claim 1, wherein step C comprises:
c1, selecting the main member carrier of the user equipment sending the bearing request as the current member carrier;
c2, judging whether the current member carrier is overloaded, if so, executing the step C3; otherwise, executing step D;
c3, judging whether the UE has an undetermined activated secondary member carrier, if so, executing the step C4; otherwise, go to step C5;
c4, selecting an undetermined auxiliary member carrier from the activated auxiliary member carrier list of the user as the current member carrier, and executing the step C2;
c5, judging whether the user has an undetermined inactive secondary member carrier, if yes, executing step C6; otherwise, executing step E;
c6, selecting an undetermined inactive secondary member carrier from the configured inactive secondary member carrier list of the user as the current member carrier;
c7, judging whether the current member carrier is overloaded, if so, executing the step C5; otherwise, go to step C8;
c8, activating the current member carrier, and then executing the step D.
3. The method according to claim 2, wherein the step C2 and the step C7 are yes, further comprising: and adjusting the scheduling parameters according to a scheduling algorithm.
4. The method of claim 1, wherein the step a of the base station counting the usage of time-frequency resources on all component carriers in the cell comprises: and the base station calculates the average transmission efficiency of all the member carriers in the cell and converts the number of the admitted and borne required physical resource blocks according to the average transmission efficiency.
5. An admission control apparatus in a carrier aggregation system, the apparatus being located in a base station device, comprising:
the UE context module is responsible for the management and operation of the UE context and provides an interface for the UE context operation for the admission control module; the UE context includes primary member carrier information, an activated secondary member carrier list and an inactivated secondary member carrier list;
the message processing module is used for receiving a bearing admission request from user equipment and outputting the bearing admission request to the admission control module for processing; and indicating the acceptance judgment failure or acceptance judgment success from the acceptance control module to the user equipment;
the receiving control module is used for counting the use conditions of the time-frequency resources on all the member carriers in the cell, judging whether the idle time-frequency resources on all the member carriers can meet the bearing receiving request or not after receiving the bearing receiving request from the message processing module, and if not, outputting a receiving judgment failure indication to the message processing module; if yes, judging whether an un-overloaded configuration member carrier exists in the configuration member carriers of the user equipment sending the bearing request, if yes, outputting an admission judgment success indication to a message processing module, otherwise, outputting an admission judgment failure indication to the message processing module; if any member carrier is found to be overloaded in the judgment process, outputting an overload indication to a scheduling module; if the non-overloaded member carrier is the non-activated auxiliary member carrier, outputting a carrier activation instruction to a carrier management module;
the scheduling module is used for scheduling and allocating the wireless resources;
and the carrier management module is used for being responsible for adding, deleting, changing, activating and deactivating the member carriers.
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| CN105813132A (en) * | 2014-12-29 | 2016-07-27 | 普天信息技术有限公司 | Carrier deactivation method and system for LTE-A (Long Term Evolution Advance) |
| CN106412949A (en) * | 2015-07-31 | 2017-02-15 | 中兴通讯股份有限公司 | Method and apparatus for aggregating 3GPP-WLAN fusion networking |
| CN106412949B (en) * | 2015-07-31 | 2020-09-11 | 中兴通讯股份有限公司 | Method and device for aggregating 3GPP-WLAN converged networking |
| CN105337717A (en) * | 2015-10-16 | 2016-02-17 | 武汉虹信通信技术有限责任公司 | Load balancing method under carrier wave aggregation system |
| CN105307234A (en) * | 2015-11-05 | 2016-02-03 | 东莞酷派软件技术有限公司 | Access control method and access control device for remote terminals, terminals and base station |
| CN106998246B (en) * | 2016-01-22 | 2020-07-10 | 电信科学技术研究院 | Admission control method and device for carrier aggregation system |
| CN107466071A (en) * | 2017-07-14 | 2017-12-12 | 中国联合网络通信集团有限公司 | A kind of network load balancing method and access network equipment |
| CN107466071B (en) * | 2017-07-14 | 2020-03-03 | 中国联合网络通信集团有限公司 | Network load balancing method and access network equipment |
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