CN104427552A - Method for load balancing in carrier aggregation - Google Patents
Method for load balancing in carrier aggregation Download PDFInfo
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- CN104427552A CN104427552A CN201310390854.0A CN201310390854A CN104427552A CN 104427552 A CN104427552 A CN 104427552A CN 201310390854 A CN201310390854 A CN 201310390854A CN 104427552 A CN104427552 A CN 104427552A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
- H04W28/082—Load balancing or load distribution among bearers or channels
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Abstract
The invention relates to a method for load balancing in carrier aggregation. The method disclosed by the invention comprises the following steps: determining an overload CC (Component Carrier) and a non-overload CC according to the load of a CC and a preset overload threshold, and determining a load mean value according to the load of the overload CC and the load of the non-overload CC; selecting a target CC and a CC to be adjusted according to the load mean value in the overload CC and the non-overload CC; switching UE (User Equipment) on the CC to be adjusted to the target CC. After the method disclosed by the embodiment of the invention is applied, the load balance among all CCs under the same eNB can be ensured, resources are sufficiently utilized, and thus the communication quality of a system is ensured.
Description
Technical field
The application relates to communication technical field, more specifically, relates to the method for load balancing in a kind of carrier aggregation.
Background technology
Carrier aggregation technology is an important technology in LTE-Advanced.Carrier aggregation refers to that the data of user can be transmitted on multiple member carrier (CC) simultaneously, is equivalent to the transmission bandwidth adding user.In LTE Rel-10 agreement, a user can use maximum 5 CC simultaneously, and the maximum transmission bandwidth of such unique user can reach 100MHz in theory, and this will greatly improve the peak rate of user data transmission.
CC represents a up-link carrier or a descending carrier, and a up CC and descending CC is associated by corresponding relation and just forms a community (Cell), so carrier aggregation is also referred to as cell aggregation.Member carrier is divided into main member carrier (PCC) and auxiliary member carrier (SCC) so that manage member carrier, and specifies that each UE is up to an a up PCC and descending PCC.Descending PCC and up PCC is associated and constitutes main plot (PCell); Descending SCC and optional up SCC is associated and constitutes auxiliary community (SCell).In Rel-10, time UE is from IDLE State Transferring to CONNECTED state, resident carrier wave becomes PCell; PCell exists always, and the increase of SCell is connected reconfiguration message with deletion by RRC and realizes.
Compared with SCell, PCell has some specific character, and as PCell can not carry out deexcitation, UE only performs activation/deactivation mechanism on SCell; User (UE) only on PCell to base station (eNB) transmitting physical uplink control information; The uplink and downlink being only supported in PCell in Rel-10 configure SPS resource.
In carrier aggregation system, LTE-A UE can configure multiple CC for transfer of data.Consider that PCC and SCC also exists otherness, compared with SCC, PCC needs additional support to manage the transmission of uplink control information, part signaling and SPS dispatching services data.
If CC as PCC access user or business too much time, having exceeded this CC can carry to greatest extent, can cause controlling resource reprovision and increasing a large amount of signaling consumption, user or business also can be caused to can not get timely scheduling, affect the communication quality of user.
Because user selects resident carrier wave according to certain principle, user transfers CONNECTED state to from IDLE state, its resident carrier wave becomes the PCell of this user, each CC like this under same eNB may occur that user distribution is unbalanced, some CC are in saturation condition as PCC, and other CC are not utilized fully as its resource of PCC.Therefore, in carrier aggregation system, between each CC under same eNB, there will be the problem that load imbalance, the utilization of resources are insufficient.This strengthens bringing the workload of system management and optimization, and the problems such as system congestion, have a strong impact on the communication quality of system.
Summary of the invention
The embodiment of the present invention proposes the method for load balancing in a kind of carrier aggregation, can ensure the load balancing between each CC under same eNB, make full use of resource, thus the communication quality of the system of guarantee.
The technical scheme of the embodiment of the present invention is as follows:
A method for load balancing in carrier aggregation, described method comprises:
Load according to carrier wave CC determines to transship CC and non-overloaded CC, by the overload load of CC and the load determination load mean value of non-overloaded CC with the overload threshold preset;
According to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC;
User UE on CC to be adjusted is switched on target CC.
Describedly to comprise according to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC:
Load mean value is less than default overload threshold, then foundation load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC.
Describedly to comprise according to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC:
Load mean value is more than or equal to default overload threshold, and only has an overload CC, then foundation load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC.
Described by overload the load of CC and the load determination load mean value of non-overloaded CC comprise:
By the overload load of CC and the load computational load average of non-overloaded CC;
Load mean value is more than or equal to default overload threshold, and has two overload CC at least, then delete the overload CC of least-loaded, redefine load mean value.
Describedly to comprise according to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC:
The CC being more than or equal to load mean value in overload CC and non-overloaded CC is CC to be adjusted; The CC being less than load mean value in overload CC and non-overloaded CC is target CC.
Described being switched on target CC by UE on CC to be adjusted comprises:
In target CC, the minimum CC of present load is to be switched target CC;
Measure the Reference Signal Received Power RSRP of to be switched target CC according to the UE on CC to be adjusted, described UE is switched on to be switched target CC;
In the target CC except described to be switched target CC, redefine the minimum CC of present load.
The described RSRP measuring to be switched target CC according to the UE on CC to be adjusted, is switched to described UE on to be switched target CC and comprises:
When the RSRP that UE on CC to be adjusted measures to be switched target CC meets default switching condition, UE corresponding for described RSRP is switched on to be switched target CC by CC to be adjusted.
Described UE corresponding for described RSRP to be switched to after on to be switched target CC by CC to be adjusted, to comprise further:
After upgrading, the load of CC to be adjusted equals load mean value, and the UE on described CC to be adjusted no longer carries out load balancing.
Described UE corresponding for described RSRP to be switched to after on to be switched target CC by CC to be adjusted, to comprise further:
The load of target CC to be switched after upgrading equals load mean value, and described to be switched target CC no longer carries out load balancing.
Described UE corresponding for described RSRP to be switched to after on to be switched target CC by CC to be adjusted, to comprise further:
After upgrading, the load of to be switched target CC is less than load mean value, when the RSRP that the UE on CC to be adjusted measures to be switched target CC meets default switching condition, is switched on to be switched target CC by UE corresponding for described RSRP by CC to be adjusted.
A is the RSRP of the to be switched target CC that current maximum described UE measures, and B is the RSRP of the CC to be adjusted that described UE is corresponding;
Described default switching condition comprises: B is less than or equal to A, or 0 < B-A≤T, and T is predetermined threshold value.
The RSRP that UE on described CC to be adjusted measures to be switched target CC meets default switching condition and comprises:
The UE selecting current RSRP maximum corresponding is as to be switched UE;
Described current RSRP maximum does not meet the switching condition preset, the switching condition that adjustment is preset.
The switching condition that described adjustment is preset comprises: adjust T, 0 < α < 1 with step-length α; The switching condition preset comprises: B is less than or equal to A, or 0 < B-A≤T(1+ α), T is predetermined threshold value.
As can be seen from technique scheme, determine to transship CC and non-overloaded CC, by the overload load of CC and the load determination load mean value of non-overloaded CC according to the load of CC with the overload threshold preset in embodiments of the present invention; According to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC; User UE on CC to be adjusted is switched on target CC.Due to the load balancing between each CC under same eNB can be ensured, make full use of resource, thus the communication quality of the system of guarantee.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram of load balancing in carrier aggregation;
Fig. 2 is the schematic flow sheet of select target CC and CC to be adjusted;
Fig. 3 is the schematic flow sheet be switched to by the UE on CC to be adjusted on target CC;
Fig. 4 is the schematic flow sheet be switched to by UE according to the RSRP of UE on target CC.
Embodiment
Express clearly clear for making the object, technical solutions and advantages of the present invention, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, determine to transship CC and non-overloaded CC, by the overload load of CC and the load determination load mean value of non-overloaded CC according to load and the overload threshold preset of CC; According to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC; User UE on CC to be adjusted is switched on target CC.Due to the load balancing between each CC under same eNB can be ensured, make full use of resource, thus the communication quality of the system of guarantee.
See the method flow schematic diagram that accompanying drawing 1 is load balancing in carrier aggregation, specifically comprise the following steps:
101, determine to transship CC and non-overloaded CC, by the overload load of CC and the load determination load mean value of non-overloaded CC according to the load of CC and default overload threshold.
Add up and assess the loading condition of each CC.The load that can consider comprises maximum user number, can utilize Radio Resource, hardware load instruction etc.Use number of users to characterize the load of CC in the present invention.Add up the number of users as PCC under each CC in eNB respectively.
If N number of CC is respectively C
1, C
2..., C
n, the load value statistical conditions of each CC current are respectively L
1, L
2..., L
n.Each CC has certain bearing capacity, if exceed this bearing capacity, then transships.Bearing capacity can convert out the user of the some that a CC supports according to the restriction configuring available idle wireless resource and device hardware resource.
Preset an overload threshold.If the load value of a CC exceedes default overload threshold, then this CC transships, otherwise this CC non-overloaded.Judge the loading condition of each CC according to the overload threshold preset, and be referred to overload CC queue or non-overloaded CC queue accordingly.
According to the situation of load evaluation, determine the need of carrying out load balancing.If all CC transship or all CC all nonoverloads, then do not carry out load balancing; Otherwise carry out load balancing.In other words, the load value L of N number of CC
1, L
2..., L
nif meet following arbitrary condition, then do not carry out load balancing:
(1) load value of all CC is all less than or equal to default overload threshold.
(2) load value of all CC is all greater than or equal to default overload threshold.
According to the load value of each CC, sort to overload CC and non-overloaded CC queue respectively, A is default overload threshold.Be provided with M(M<N) individual CC overload, two queue order are
Overload CC:A < L'
1≤ L'
2≤ ...≤L'
m
Non-overloaded CC:L'
m+1≤ L'
m+2≤ ...≤L'
n≤ A
102, foundation load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC.
According to current whole loading condition computational load average.According to load mean value, overload CC and non-overloaded CC is divided into two queues, i.e. target CC and CC to be adjusted.
103, the UE on CC to be adjusted is switched on target CC.
Due to the UE on CC to be adjusted is switched on target CC, the correspondingly load reduction of CC to be adjusted, the load of target CC increases, and achieves the load balancing between each CC, makes full use of resource, thus the communication quality of the system of guarantee.
Below in conjunction with accompanying drawing 2, the process according to load mean value select target CC and CC to be adjusted is described.
201, computational load average, is averaged by the load value of each CC in non-overloaded CC queue and overload CC queue and obtains load mean value.
202, load mean value is less than default overload threshold, then illustrate and can realize load balancing between overload CC and non-overloaded CC, perform 204; Load mean value is more than or equal to default overload threshold, then illustrate and cannot realize load mean value between overload CC and non-overloaded CC, therefore need the number adjusting overload CC, perform 203.
If 203 only remain an overload CC, the number of overload CC cannot be adjusted, then perform 204.
204, the CC being more than or equal to load mean value in overload CC and non-overloaded CC is CC to be adjusted; The CC being less than load mean value in overload CC and non-overloaded CC is target CC.
205, by deleting the number of the overload CC adjustment overload CC of least-loaded, then returning 201 and recalculating load mean value.
Describe in detail below in conjunction with accompanying drawing 3 and the UE on CC to be adjusted is switched on target CC.
301, compared by CC to be adjusted and target CC and sort, can be divided into following two queues, load mean value is B:
Be greater than load mean value CC and CC:B < L to be adjusted "
1≤ L''
2≤ ...≤L''
p.
Be less than or equal to load mean value CC and target CC:L''
p+1≤ L''
p+2≤ ...≤L''
p+Q≤ B.
Choose and be less than or equal to first CC in load mean value CC queue and, as to be switched target CC, namely select the CC of least-loaded in target CC as to be switched target CC.
302, measure the Reference Signal Received Power (RSRP) of to be switched target CC according to the UE on CC to be adjusted, be switched on to be switched target CC by described UE, detailed process is see Fig. 4 and 401-410.
303, in the target CC except to be switched target CC, the minimum CC of present load can be redefined, then return 301; Otherwise, terminate.
Describe in detail below in conjunction with accompanying drawing 4 and according to the RSRP of UE, UE is switched on target CC.
401, the RSRP that the to be switched target CC measured according to the UE of CC to be adjusted is corresponding carries out descending sort, and this UE refers to the user of CC to be adjusted as PCC.
402, first user profile in RSRP sequencing queue is read.
403, this user meets switching condition, then perform 404; This user does not meet switching condition, then perform 405.
A is the RSRP of the to be switched target CC that the UE of CC to be adjusted measures, and B is the RSRP of the CC to be adjusted that the UE of CC to be adjusted is corresponding;
Switching condition comprises: B is less than or equal to A, or 0 < B-A≤T, and T is predetermined threshold value.
First user in RSRP sequencing queue does not meet switching condition, and namely current RSRP maximum does not meet the switching condition preset, then need to adjust switching condition.T, 0 < α < 1 is adjusted with step-length α; Switching condition is adjusted to: B is less than or equal to A, or 0 < B-A≤T(1+ α), T is predetermined threshold value.
404, the UE of CC to be adjusted switches, and is namely switched to be switched target CC from CC to be adjusted.
405, this UE is not last user in RSRP queue, then perform 406; This UE is last user in RSRP queue, then perform 407.
406, next user profile in RSRP queue is read, the user profile that namely the maximum RSRP of reading except current RSRP maximum in RSRP is corresponding.
407, revise RSRP predetermined threshold value, namely revise T.T, 0 < α < 1 is adjusted with step-length α.
408, the load of CC to be adjusted is upgraded.Because UE is switched to be switched target CC from CC to be adjusted, therefore the load of CC to be adjusted there occurs change.After upgrading, the load of CC to be adjusted equals load mean value, then perform 409; Otherwise, perform 410.
409, the load owing to upgrading rear CC to be adjusted equals load mean value, then this CC to be adjusted reaches load balancing, therefore in the queue of CC to be adjusted, deletes CC to be adjusted.
410, the load of to be switched target CC is upgraded.Because UE is switched to be switched target CC from CC to be adjusted, the load of therefore to be switched target CC there occurs change.The load of target CC to be switched after upgrading equals load mean value, then the load of to be switched target CC reaches load balancing, then terminate; Otherwise, perform 405, continue the UE of CC to be adjusted to be switched on to be switched target CC.
It should be noted that herein, in the handoff procedure of 401-410, only comprise a to be switched target CC, at least one CC to be adjusted.When the load of CC to be adjusted equals load mean value, and the load of to be switched target CC does not reach load mean value, then illustrate that to be switched target CC can also carry UE, therefore can continue to determine that meeting switching condition UE switches.When the load of CC to be adjusted equals load mean value, the load of to be switched target CC also equals load mean value, illustrate that CC to be adjusted and to be switched target CC all reaches load balancing, in 303, therefore redefine the minimum CC of present load, namely redefine to be switched target CC.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the method for load balancing in carrier aggregation, it is characterized in that, described method comprises:
Load according to carrier wave CC determines to transship CC and non-overloaded CC, by the overload load of CC and the load determination load mean value of non-overloaded CC with the overload threshold preset;
According to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC;
User UE on CC to be adjusted is switched on target CC.
2. the method for load balancing in carrier aggregation according to claim 1, is characterized in that, describedly comprises according to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC:
Load mean value is less than default overload threshold, then foundation load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC.
3. the method for load balancing in carrier aggregation according to claim 1, is characterized in that, describedly comprises according to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC:
Load mean value is more than or equal to default overload threshold, and only has an overload CC, then foundation load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC.
4. the method for load balancing in carrier aggregation according to Claims 2 or 3, is characterized in that, is describedly comprised by the overload load of CC and the load determination load mean value of non-overloaded CC:
By the overload load of CC and the load computational load average of non-overloaded CC;
Load mean value is more than or equal to default overload threshold, and has two overload CC at least, then delete the overload CC of least-loaded, redefine load mean value.
5. the method for load balancing in carrier aggregation according to claim 1, is characterized in that, describedly comprises according to load mean value select target CC and CC to be adjusted in overload CC and non-overloaded CC:
The CC being more than or equal to load mean value in overload CC and non-overloaded CC is CC to be adjusted; The CC being less than load mean value in overload CC and non-overloaded CC is target CC.
6. the method for load balancing in carrier aggregation according to claim 1, it is characterized in that, described being switched on target CC by UE on CC to be adjusted comprises:
In target CC, the minimum CC of present load is to be switched target CC;
Measure the Reference Signal Received Power RSRP of to be switched target CC according to the UE on CC to be adjusted, described UE is switched on to be switched target CC;
In the target CC except described to be switched target CC, redefine the minimum CC of present load.
7. the method for load balancing in carrier aggregation according to claim 6, is characterized in that described UE is switched on to be switched target CC and comprises by the described RSRP measuring to be switched target CC according to the UE on CC to be adjusted:
When the RSRP that UE on CC to be adjusted measures to be switched target CC meets default switching condition, UE corresponding for described RSRP is switched on to be switched target CC by CC to be adjusted.
8. the method for load balancing in carrier aggregation according to claim 7, is characterized in that, is describedly switched to after on to be switched target CC by CC to be adjusted by UE corresponding for described RSRP, comprises further:
After upgrading, the load of CC to be adjusted equals load mean value, and the UE on described CC to be adjusted no longer carries out load balancing.
9. the method for load balancing in carrier aggregation according to claim 7, is characterized in that, is describedly switched to after on to be switched target CC by CC to be adjusted by UE corresponding for described RSRP, comprises further:
The load of target CC to be switched after upgrading equals load mean value, and described to be switched target CC no longer carries out load balancing.
10. the method for load balancing in carrier aggregation according to claim 7, is characterized in that, is describedly switched to after on to be switched target CC by CC to be adjusted by UE corresponding for described RSRP, comprises further:
After upgrading, the load of to be switched target CC is less than load mean value, when the RSRP that the UE on CC to be adjusted measures to be switched target CC meets default switching condition, is switched on to be switched target CC by UE corresponding for described RSRP by CC to be adjusted.
11. methods of load balancing in carrier aggregation according to claim 7, it is characterized in that, A is the RSRP of the to be switched target CC that current maximum described UE measures, and B is the RSRP of the CC to be adjusted that described UE is corresponding;
Described default switching condition comprises: B is less than or equal to A, or 0 < B-A≤T, and T is predetermined threshold value.
12. methods of load balancing in carrier aggregation according to claim 7, is characterized in that, the RSRP that the UE on described CC to be adjusted measures to be switched target CC meets default switching condition and comprises:
The UE selecting current RSRP maximum corresponding is as to be switched UE;
Described current RSRP maximum does not meet the switching condition preset, the switching condition that adjustment is preset.
13., according to the method for load balancing in carrier aggregation described in claim 12, is characterized in that, the switching condition that described adjustment is preset comprises: adjust T, 0 < α < 1 with step-length α; The switching condition preset comprises: B is less than or equal to A, or 0 < B-A≤T(1+ α), T is predetermined threshold value.
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| CN105101299A (en) * | 2014-05-09 | 2015-11-25 | 普天信息技术有限公司 | Load balancing method in carrier aggregation system |
| CN105208602A (en) * | 2015-10-16 | 2015-12-30 | 中国联合网络通信集团有限公司 | Load balancing method and device |
| CN105898801A (en) * | 2016-06-07 | 2016-08-24 | 中国联合网络通信集团有限公司 | Load balance method and base station |
| CN106612522A (en) * | 2015-10-26 | 2017-05-03 | 大唐移动通信设备有限公司 | Method and device for configuring component carriers in LTE-A (Long Term Evolution-Advanced) heterogeneous network |
| CN107124739A (en) * | 2017-04-14 | 2017-09-01 | 京信通信技术(广州)有限公司 | A kind of load-balancing method and device |
| WO2019095805A1 (en) * | 2017-11-17 | 2019-05-23 | 电信科学技术研究院有限公司 | Congestion control method, terminal and computer-readable storage medium |
| CN110611918A (en) * | 2018-06-14 | 2019-12-24 | 成都鼎桥通信技术有限公司 | Method and device for configuring uplink carrier in carrier aggregation and base station |
| CN109586861B (en) * | 2017-09-28 | 2021-05-25 | 中国移动通信集团山东有限公司 | Load balancing method and device for carrier aggregation system |
| CN113098763A (en) * | 2021-06-10 | 2021-07-09 | 天聚地合(苏州)数据股份有限公司 | Instant communication message sending method, device, storage medium and equipment |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105101299B (en) * | 2014-05-09 | 2018-08-24 | 普天信息技术有限公司 | A kind of method of load balancing in carrier aggregation system |
| CN105101299A (en) * | 2014-05-09 | 2015-11-25 | 普天信息技术有限公司 | Load balancing method in carrier aggregation system |
| CN105208602A (en) * | 2015-10-16 | 2015-12-30 | 中国联合网络通信集团有限公司 | Load balancing method and device |
| CN105208602B (en) * | 2015-10-16 | 2018-12-11 | 中国联合网络通信集团有限公司 | A kind of method and device of load balancing |
| CN106612522A (en) * | 2015-10-26 | 2017-05-03 | 大唐移动通信设备有限公司 | Method and device for configuring component carriers in LTE-A (Long Term Evolution-Advanced) heterogeneous network |
| CN105898801A (en) * | 2016-06-07 | 2016-08-24 | 中国联合网络通信集团有限公司 | Load balance method and base station |
| CN105898801B (en) * | 2016-06-07 | 2019-04-02 | 中国联合网络通信集团有限公司 | A kind of load-balancing method and base station |
| CN107124739A (en) * | 2017-04-14 | 2017-09-01 | 京信通信技术(广州)有限公司 | A kind of load-balancing method and device |
| CN107124739B (en) * | 2017-04-14 | 2020-06-23 | 京信通信系统（中国）有限公司 | Load balancing method and device |
| CN109586861B (en) * | 2017-09-28 | 2021-05-25 | 中国移动通信集团山东有限公司 | Load balancing method and device for carrier aggregation system |
| WO2019095805A1 (en) * | 2017-11-17 | 2019-05-23 | 电信科学技术研究院有限公司 | Congestion control method, terminal and computer-readable storage medium |
| CN110611918A (en) * | 2018-06-14 | 2019-12-24 | 成都鼎桥通信技术有限公司 | Method and device for configuring uplink carrier in carrier aggregation and base station |
| CN113098763A (en) * | 2021-06-10 | 2021-07-09 | 天聚地合(苏州)数据股份有限公司 | Instant communication message sending method, device, storage medium and equipment |
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| CN104427552B (en) | 2018-03-30 |
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