CN104244318A - Method and device for adjusting time to trigger - Google Patents
Method and device for adjusting time to trigger Download PDFInfo
- Publication number
- CN104244318A CN104244318A CN201310228505.9A CN201310228505A CN104244318A CN 104244318 A CN104244318 A CN 104244318A CN 201310228505 A CN201310228505 A CN 201310228505A CN 104244318 A CN104244318 A CN 104244318A
- Authority
- CN
- China
- Prior art keywords
- switching
- weight
- information
- ttt
- switches
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a method for adjusting time to trigger (TTT). The method comprises the steps that when a mobile terminal (UE) switches, a target base station (TeNB) obtains the auxiliary switching information of the UE and determines the weight of switching this time according to the auxiliary switching information of the UE; the TeNB issues a switching command to the UE, wherein the switching weight is carried in the switching command; the UE performs switching counting according to the switching weight in the switching command to obtain updated switching frequency; the UE adjusts the TTT according to the updated switching frequency. The invention further discloses the base station and the UE for adjusting the TTT.
Description
Technical field
The application relates to mobile communication technology, and particularly mobile communication equipment adjusts method and the device in reporting measurement reports triggered time in handoff procedure.
Background technology
Cellular mobile telephone brings great convenience to the communication of people.Third generation partner program (3rd Generation Partnership Project, 3GPP), as the vital tissue of moving communicating field, has greatly promoted the Standardization of G mobile communication (The Third Generation, 3G).A few days ago, in order to tackle the challenge of broadband access technology, and meet the demand of growing new business, 3GPP will start 3G Long Term Evolution (Long Term Evolution in the end of the year 2004, LTE) standardization effort of technology, ites is desirable to improve spectrum efficiency further, improves the performance of Cell Edge User, reduce system delay, for high velocity mobile users provides the access service etc. of higher rate.The LTE(LTE-Advanced, the LTE-A that improve) technology is especially on the basis of LTE technology, and several times increase spectral bandwidth, significantly improve data rate, for more mobile subscribers provide the service of higher rate, better performance.
In above-mentioned various mobile communication system, the mobile management of user under connection (CONNECTED) state is particularly important.In order to realize, to user's ambulant management in connected state, defining the concept of switching in mobile communication system, the user being in connection status is allowed to be switched to other community from current Serving cell when meeting certain condition.If do not switched, user accesses the situation of new community again there will be call drop when shifting out Serving cell after, can have a strong impact on customers' satisfaction level like this.
In general, switch and mainly comprise four steps: measure, measurement reports, switch decision and switching perform.Wherein, measure and refer to Reference Signal Received Power (the Reference Signal Received Power of user to its Serving cell and neighbor cell, RSRP) or Reference Signal Received Quality (Reference Signal Received Quality, RSRQ) or other signal strength signal intensity parameter that can characterize cell signal strength measure.Measure report refer to meet by measure configuration setting handover measurement report reporting condition time report handover measurement to report to source base station.Switch decision refers to according to handover measurement report, source base station judges that this user is the need of carrying out switching and selected target base station.Switch to perform and mainly refer to that user disconnects with the connection of source base station and sets up the process with the connection of target BS.This shows, in above-mentioned handoff procedure, handover measurement report reporting condition and judge whether that the switching condition carrying out switching is related to the target BS that a performance whether can be chosen best, therefore the setting of handover measurement report reporting condition and switching condition is very important.The handover measurement report reporting condition that current LTE system uses mostly is the measurement report report condition based on event Event A3, also the difference namely measuring RSRP or RSRQ of certain neighbor cell and RSRP or RSRQ of Serving cell when mobile terminal (UE) is greater than the switching side-play amount HO_margin(that Serving cell configures and is usually set to 3dB) time, start timing; If above-mentioned measurement report report condition can be met within predetermined a period of time, then UE will report the handover measurement of the signal strength signal intensity parameter carrying Serving cell and this neighbor cell to report to source base station.After this, source base station will carry out switch decision according to the signal strength signal intensity parameter of the Serving cell of carrying in the handover measurement report of reporting of user and this neighbor cell.If the result of switch decision needs to switch, then complete hand-off execution process further.The predetermined a period of time mentioned in said process is also called the triggered time (Time To Trigger, TTT) of triggering reporting measurement reports.
Those skilled in the art will appreciate that the time required for whole handoff procedure mainly comprises: TTT, switch decision and the time switched needed for execution.Wherein, switch decision and the time needed for performing that switches are fixed substantially, and TTT is then variable.Therefore, can think that TTT is the principal element affecting whole handoff procedure required time.Under normal circumstances, if TTT is long, measurement can be made to report evening, this, when UE translational speed is very fast, can increase handover failure rate greatly; And if TTT is too short, then UE can be caused to switch frequently, cause ping-pong serious.
At existing LTE version 9(Rel-9) in standard, by mobility status, UE estimates that (Mobility State Estimation, MSE) adjusts the size of TTT.Specifically, UE estimates the translational speed of self according to the switching times in certain hour, and adjusts the size of TTT according to the translational speed of self.Under normal circumstances, the translational speed of UE is faster, then make TTT less, thus allows UE to access Target cell faster, to reduce the mortality of switching; And the translational speed of UE is slower, then make TTT larger, switching condition is become harsh, to reduce the impact of ping-pong.Above-mentioned mobility status method of estimation obtains and extensively and effectively applies in traditional homogeneous network (Homogeneous Network, HomoNet), but and is not suitable for being applied in heterogeneous network (Heterogeneous Network, HetNet).
Heterogeneous network HetNet be a kind of can the technology of significantly elevator system throughput and overall network efficiency.Heterogeneous network refers to that at least one low power nodes (Low Power Node, LPN) is placed on by cloth in the overlay area of a high power node (High Power Node, HPN), forms the heterogeneous system with the different node types covered.Wherein, HPN refers to that transmitting power is higher, the base station that covering radius is larger, such as, and macrocell base stations etc.; LPN refers to that transmitting power is lower, covers partly less base station, such as, and small cell base station, microcell base station, millimicro cellular basestation and far end radio frequency head (Remote Radio Head, RRH) or relaying (Relay) etc.
In HetNet, multiple cellulor community covered by small cell base station may be there is due in the macrocell that a macrocell base stations covers, network density is increased greatly.In this case, also may occur repeatedly to switch even if UE moves with slower speed in this macrocell.Now, if apply above-mentioned mobility status method of estimation, the basis for estimation only using switching times as UE translational speed speed, the translational speed of UE can be caused seriously to be over-evaluated, so TTT is adjusted too low, thus cause occurring serious ping-pong.
Summary of the invention
In order to solve the problem, embodiments of the invention propose a kind of adjustment reporting measurement reports triggered time method, realize the accurate adjustment of TTT.
The method of the adjustment TTT that the embodiment of the present invention proposes comprises: when mobile terminal UE switches, target BS TeNB obtains the auxiliary handoff information of described UE; TeNB determines this switching weight switched according to the auxiliary handoff information of described UE; And TeNB issues switching command to UE, and in switching command, carry described switching weight.
Wherein, the supplementary that UE switches comprises the switching historical information of described UE.
Said method comprises further: source base station SeNB stores the switching historical information of described UE, and after switch decision, the switching historical information of the described UE self stored is sent to TeNB.
Said method can further include: Mobility Management Entity MME stores the switching historical information of described UE, and after switch decision, the switching historical information of the described UE self stored is sent to TeNB.
Wherein, according to the auxiliary handoff information of described UE, TeNB determines that the switching weight that this switches comprises: determine the first switching weight according to the switching historical information of described UE, and switches the switching weight that switches as this of weight using determine first.
The supplementary that UE switches comprises the deployment information of Target cell; According to the auxiliary handoff information of described UE, TeNB determines that the switching weight that this switches comprises: determine the second switching weight according to the deployment information of Target cell, and switches the switching weight that switches as this of weight using determine second.
The supplementary that UE switches comprises the switching historical information of described UE and the deployment information of Target cell; According to the auxiliary handoff information of described UE, TeNB determines that the switching weight that this switches comprises: determine the first switching weight according to the switching historical information of described UE; The second switching weight is determined according to the deployment information of Target cell; And the switching weight selecting the minimum value in the first switching weight and the second switching weight to switch as this.
Determine that the first switching weight comprises according to the switching historical information of described UE: if judge within predetermined a period of time according to the switching historical information of described UE, described UE switches away rear preparation from community A and again switches back community A, then switch weight by first and be set to 0; Otherwise, switch weight by first and be set to 1.
Determine that the second switching weight comprises according to the deployment information of Target cell: determine the second switching weight according to Target cell size information.
The auxiliary handoff information of UE comprises the deployment information of cell-of-origin further; Described method comprises further: judge whether cell-of-origin is identical with the coverage of Target cell according to the deployment information of cell-of-origin and the deployment information of Target cell or judge that the coverage of cell-of-origin is whether within the coverage of Target cell, if so, then switch weight by second and be set to 0.
The method of the adjustment TTT that another embodiment of the present invention provides comprises: UE carries out toggle count according to the switching weight of carrying in switching command, obtains the switching times after upgrading; And UE is according to the switching times adjustment TTT after renewal.
UE carries out toggle count according to the switching weight in switching command and comprises: UE carries out toggle count according to following formula:
Wherein, HO_count represents the switching times of UE record;
represent the switching weight of carrying in switching command.
The method of the TTT that further embodiment of this invention provides comprises: UE determines this weight switched according to the auxiliary handoff information of self; UE carries out toggle count according to switching weight, obtains the switching times after upgrading; And UE is according to the switching times adjustment TTT after renewal.
Auxiliary handoff information comprises the switching historical information that UE self stores; According to the auxiliary handoff information of self, described UE determines that the switching weight that this switches comprises: described UE determines the first switching weight according to the switching historical information self stored, and switches the switching weight that switches as this of weight using determine first.
Auxiliary handoff information comprises the deployment information of Target cell; According to the auxiliary handoff information of self, described UE determines that the switching weight that this switches comprises: described UE determines the second switching weight according to the deployment information of TeNB, and switches the switching weight that switches as this of weight using determine second.
Auxiliary handoff information comprises the deployment information of the Target cell that the switching historical information of UE and target BS TeNB provide; According to the auxiliary handoff information of self, described UE determines that the weight that this switches comprises: UE determines the first switching weight according to the switching historical information self stored; The deployment information of the Target cell that UE provides according to TeNB determines the second switching weight; And select first to switch the switching weight of the minimum value in weight and the second switching weight as current switching.
According to the switching historical information self stored, UE determines that the first switching weight comprises: if judge within predetermined a period of time according to the switching historical information of described UE, described UE switches away rear preparation from community A and again switches back community A, then switch weight by first and be set to 0; Otherwise, switch weight by first and be set to 1.
According to the deployment information of Target cell, UE determines that the second switching weight comprises: determine the second switching weight according to Target cell size information.
The auxiliary handoff information of UE comprises the deployment information of cell-of-origin further; Described method comprises further: judge whether cell-of-origin is identical with the coverage of Target cell according to the deployment information of cell-of-origin and the deployment information of Target cell or judge that the coverage of cell-of-origin is whether within the coverage of Target cell, if so, then switch weight by second and be set to 0.
UE carries out toggle count according to switching weight and comprises: UE carries out toggle count according to following formula:
Wherein, HO_count represents the switching times of UE record;
represent the switching weight that this switches.
The method of the adjustment TTT that another embodiment of the present invention provides comprises: the initial value TTT pre-setting TTT
0; Pre-set n threshold value thre
1, thre
2..., thre
nand n the coefficient factor corresponding with a described n threshold value
1, factor
2..., factor
n, meet 0<thre1<thre2< ... <thren and 1>factor
1>factor
2> ... >factor
n>0; Wherein, n is natural number; UE carries out toggle count, often occurs once to switch, and switching counter value HO_count adds 1; UE adjusts a described n threshold value or a described n coefficient according to the auxiliary handoff information of UE; If meet thre
k< HO_count < thre
k+1then, TTT=TTT is made
0× factor
k, wherein, k<n, and k is natural number; If meet HO_count > thre
n, then TTT=TTT is made
0× factor
n.
The base station that the embodiment of the present invention provides comprises: auxiliary handoff information acquisition module, for obtaining the auxiliary handoff information of user terminal UE; Switch weight determination module, for determining this switching weight switched according to the auxiliary handoff information of UE; And switching command issues module, for issuing switching command to UE, and in switching command, carry described switching weight.
The UE that the embodiment of the present invention provides comprises: switch weight receiver module, switches weight for extracting from the switching command received; Toggle count module, for carrying out toggle count according to the switching weight in switching command, obtains the switching times after upgrading; And triggered time adjusting module, for adjusting triggered time TTT according to the switching times after renewal.
The another kind of base station that the embodiment of the present invention provides comprises: switching command issues module, for issuing switching command to UE, and in switching command, carries the deployment information of self.
The another kind of UE that the embodiment of the present invention provides comprises: switch weight determination module, for determining this weight switched according to the auxiliary handoff information of self; Toggle count module, for carrying out toggle count according to switching weight, obtains the switching times after upgrading; And triggered time adjusting module, for adjusting triggered time TTT according to the switching times after renewal.
Another UE that the embodiment of the present invention provides comprises: initialization module, for pre-setting the initial value TTT of triggered time TTT
0; Threshold setting module, for pre-setting n threshold value thre
1, thre
2..., thre
nand n the coefficient factor corresponding with this n threshold value
1, factor
2..., factor
n, meet 0<thre1<thre2< ... <thren and factor
1>factor
2> ... >factor
n>0; Wherein, n is natural number; Toggle count module, for carrying out toggle count, often occur once to switch, switching counter value HO_count adds 1; Threshold adjustment module, for adjusting a described n threshold value or a described n coefficient according to the auxiliary handoff information of self; And triggered time adjusting module, if meet thre
k< HO_count < thre
k+1then, TTT=TTT is made
0× factor
k, wherein, k<n, and k is natural number; If meet HO_count > thre
n, then TTT=TTT is made
0× factor
n.
As can be seen from the above-described embodiment, said method can switch historical information adjustment TTT according to network design information and/or UE, realize the accurate estimation of UE translational speed, effectively solve the UE translational speed that caused when edge, neighbor cell switches back and forth by the problem over-evaluated and UE due to the intensive too high UE translational speed caused in community under HetNet network environment by the problem over-evaluated.For these reasons, can be estimated the translational speed of UE by said method more accurately, adjustment obtains the TTT be applicable to, thus improves performance of handoffs, realizes lower handover failure rate, alleviates the impact of ping-pong simultaneously.
Accompanying drawing explanation
Fig. 1 shows the method flow diagram of the adjustment TTT described in one embodiment of the invention;
Fig. 2 shows the concrete methods of realizing of step 102 in Fig. 1;
Fig. 3 shows the method flow diagram of the adjustment TTT described in another embodiment of the present invention;
Fig. 4 shows the concrete methods of realizing of step 301 in Fig. 3;
Fig. 5 shows the method flow diagram of the adjustment TTT described in another embodiment of the present invention;
The internal structure schematic diagram that Fig. 6 is the base station described in one embodiment of the invention;
The internal structure schematic diagram that Fig. 7 is the UE described in one embodiment of the invention;
The internal structure schematic diagram that Fig. 8 is the base station described in another embodiment of the present invention;
The internal structure schematic diagram that Fig. 9 is the UE described in another embodiment of the present invention; And
Figure 10 is the internal structure schematic diagram of the UE described in another embodiment of the present invention.
Embodiment
In order to solve the problem, embodiments of the invention give the method for adjustment TTT, the auxiliary handoff information of UE can be utilized to realize more accurate mobility status and estimate.The auxiliary handoff information of above-mentioned UE can comprise: UE switches deployment information of historical information and cell-of-origin and/or Target cell etc.Wherein, deployment information comprises one of information such as subdistrict position, cell size and cell type or its combination in any.
Various implementation of the present invention is described in detail below in conjunction with concrete example and accompanying drawing.
Embodiment 1
Fig. 1 shows the method flow diagram of the adjustment TTT described in one embodiment of the invention.As shown in Figure 1, the method mainly comprises:
Step 101, when mobile terminal (UE) switches, target BS (TeNB) obtains the auxiliary handoff information of this UE;
Step 102, TeNB determines this switching weight switched according to the auxiliary handoff information of UE;
Step 103, TeNB issues switching command to UE, and in switching command, carry above-mentioned switching weight;
Step 104, UE carries out toggle count according to the switching weight in switching command, obtains the switching times after upgrading; And
Step 105, UE is according to the switching times adjustment TTT after renewal.
The concrete manner of execution of each step in Fig. 1 will be described in detail below further combined with accompanying drawing.
As previously mentioned, auxiliary handoff information can comprise the switching historical information of UE.The switching historical information of UE comprises: the list of UE service eNB after wireless heterogeneous networks (RRC) connection establishment and each eNB are the time etc. that this UE serves.
In the application of reality, the switching historical information of UE can be stored by source base station (SeNB), and in above-mentioned steps 101, after switch decision, the switching historical information of the UE self stored is sent to TeNB by SeNB.Usually, SeNB, when determining to switch, can send handover request message to TeNB.In the present embodiment, the switching historical information of UE, while transmission handover request, such as, by X2 interface, is sent to TeNB by SeNB.
Or, as the replacement scheme of such scheme, also can by other entities in network except SeNB, such as Mobility Management Entity (MME) stores the switching historical information of UE, and in above-mentioned steps 101, the switching historical information of the UE self stored by MME after switch decision sends to TeNB.
In addition, as previously mentioned, auxiliary handoff information also can comprise the deployment information of cell-of-origin and/or the deployment information of Target cell.Usually, after network design is complete, core net can store the deployment information of each community, and each eNB all can from the disposable deployment information obtaining self and neighbor cell thereof of core net.
Specifically, in above-mentioned steps 102, if auxiliary handoff information only includes the switching historical information of UE, then TeNB can determine the first switching weight according to the switching historical information of UE, and switches the switching weight that switches as this of weight using first; If auxiliary handoff information only includes the deployment information of Target cell, then TeNB can determine the second switching weight according to the deployment information of Target cell, and switches the switching weight that switches as this of weight using second; If the switching historical information that auxiliary handoff information had both comprised UE also comprises the deployment information of Target cell, then can determine this switching weight switched according to the method shown in Fig. 2.Method shown in Fig. 2 specifically comprises:
Step 1021:TeNB determines the first switching weight according to the switching historical information of UE;
Step 1022:TeNB determines the second switching weight according to the deployment information of Target cell; And
The switching weight that step 1023:TeNB selects the minimum value in the first switching weight and the second switching weight to switch as this.
Wherein, according to the switching historical information of UE, TeNB determines that the concrete grammar of the first switching weight is: if judge that this UE switches back and forth between neighbor cell according to the switching historical information of UE, switches weight be set to 0 by first; Otherwise, switch weight by first and be set to 1.Such as, if judge within predetermined a period of time according to the switching historical information of UE, UE switches away rear preparation from community A and again switches back community A, then can switch weight by first and be set to 0; Otherwise, switch weight by first and be set to 1.Above-mentioned predetermined a period of time can be that eNB and UE is pre-specified, also can by eNB by RRC signal deployment to UE, and its representative value can be such as 1 second.
In addition, according to the deployment information of Target cell, TeNB determines that the method for the second switching weight comprises: determine the second switching weight according to Target cell size information, wherein, Target cell size can characterize by the diameter of Target cell or by the transmitting power of TeNB.Concrete grammar can comprise following two kinds:
Method 1, determines the second switching weight according to the cell size of the Target cell pre-set and the second corresponding relation switched between weight.Under normal circumstances, the community at TeNB place is larger, and it is less that second of its correspondence switches weight.
The diameter and second giving community, TeNB place as following table 1 switches an example of corresponding relation between weight.In the application of reality, directly can determine the second switching weight according to following table 1.It should be noted that, table 1 only provides an example, also can carry out accommodation to the concrete numerical value in following table, and as an alternative solution, the cell diameter parameter in following table 1 also can be replaced in practical application by the transmit power parameter of TeNB.
| Cell diameter (rice) | 0～100 | 100～200 | 200～300 | 300～400 | More than 400 |
| Second switches weight | 0.2 | 0.4 | 0.6 | 0.8 | 1 |
Table 1
Method 2, calculates second according to following formula (1) and switches weight.It should be noted that, if according to following formula (1) calculate second switch weight be greater than 1, then by second switch weight be set to 1.
ω2=cell_size×γ（1）
Wherein, ω 2 represents the second switching weight; Cell_size represents the size of Target cell, specifically can be characterized by the transmitting power of the diameter of Target cell or TeNB; γ is the coefficient preset, such as 0.002.
If comprise the deployment information of cell-of-origin in auxiliary handoff information further, then in a step 102, second can be upgraded according to the deployment information of cell-of-origin further and switch weight, concrete grammar comprises: judge whether cell-of-origin is identical with the coverage of Target cell according to the deployment information of cell-of-origin and the deployment information of Target cell or judge that the coverage of cell-of-origin is whether within the coverage of Target cell, if so, then switch weight by second further and be set to 0.
In above-mentioned steps 103, in order to carry switching weight in switching command, the information element (Information Element, IE) that increase by is new in switching command is needed to carry switching weight.
In above-mentioned steps 104, UE will carry out toggle count according to following formula (2), upgrade switching times.
Wherein, HO_count represents the switching times of UE record;
represent the switching weight that this switches.
It should be noted that, in the present embodiment, what the above-mentioned counter carrying out toggle count calculated is by the switching times after weighting in the predetermined time of system configuration at one section.Further, often pass through this predetermined time, this counter all can reset.
In above-mentioned steps 105, UE can according to the switching times adjustment TTT after renewal.Concrete grammar comprises:
Method 1: the initial value TTT pre-setting TTT
0, n threshold value thre
1, thre
2..., thre
nand n the coefficient factor corresponding with this n threshold value
1, factor
2..., factor
n, meet 0<thre
1<thre
2< ... <thre
nand 1>factor
1>factor
2> ... >factor
n>0, wherein, n is natural number.If kth+1 threshold value that HO_count is greater than a kth threshold value wherein and is less than wherein, if also namely meet thre
k< HO_count < thre
k+1then, TTT=TTT is made
0× factor
k, wherein k<n, and k is natural number; And if meet HO_count > thre
n, then TTT=TTT is made
0× factor
n.
In an example of the present invention, n can equal 2.If also namely HO_count is greater than a first threshold thre pre-set
1and be less than a Second Threshold thre pre-set
2, then think that UE is middling speed equipment, make TTT=TTT
0× factor
1; If HO_count is greater than Second Threshold thre
2, then think that UE is high-speed equipment, make TTT=TTT
0× factor
2.Wherein, factor
1>factor
2.
Method 2: directly calculate TTT according to following formula (3), but demand fulfillment condition TTT≤TTT
0:
Wherein, δ be pre-set be greater than 0 coefficient, and δ can pass through RRC signal deployment.
The dynamic conditioning to TTT can be realized by above-mentioned two kinds of methods, and can meet when HO_count is larger, obtain less TTT.
Afterwards, in upper handoff procedure once, the TTT triggering measurement that UE just can apply through dynamic conditioning has reported.
Embodiment 2:
Fig. 3 shows the adjustment TTT method described in another embodiment of the present invention.As shown in Figure 3, the method mainly comprises:
Step 301, UE determines this weight switched according to the auxiliary handoff information of self.
Step 302, UE carries out toggle count according to switching weight, obtains the switching times after upgrading.Wherein, the manner of execution of step 302 is identical with the step 104 in above-described embodiment 1, does not repeat them here.
Step 303, UE is according to the switching times adjustment TTT after renewal.Wherein, the manner of execution of step 303 is also identical with the step 105 in above-described embodiment 1, also repeats no more at this.
The manner of execution of step 301 in Fig. 4 will be described in detail below further combined with accompanying drawing.
As previously mentioned, the auxiliary handoff information of UE can comprise the switching historical information of UE.And the switching historical information of self in the present embodiment, can be stored by UE.
In addition, auxiliary handoff information can also comprise the deployment information of the Target cell that TeNB provides.In the present embodiment, the deployment information of Target cell is handed down to UE by the switching command issued to UE by TeNB.UE extracts the deployment information of Target cell from the switching command received.In this step, in order to carry the deployment information of Target cell in switching command, need in switching command, to increase a new IE to carry the deployment information of Target cell.
Specifically, in above-mentioned steps 301, if auxiliary handoff information only includes the switching historical information of UE, then UE determines the first switching weight according to the switching historical information of UE, and switches the switching weight that switches as this of weight using first.If auxiliary handoff information only includes the deployment information of Target cell, then UE can determine the second switching weight according to the deployment information of Target cell, and switches the switching weight that switches as this of weight using second.If the switching historical information that auxiliary handoff information had both comprised UE also comprises the deployment information of Target cell, then can determine this switching weight switched according to the method shown in Fig. 4.Method shown in Fig. 4 comprises:
Step 3011:UE determines the first switching weight according to the switching historical information self stored;
Step 3012:UE determines the second switching weight according to the deployment information of Target cell; And
Step 3013: select first to switch weight and second and switch the switching weight of the minimum value in weight as current switching.
Wherein, the manner of execution of step 3011 is identical with step 1021, does not repeat them here.
The manner of execution of step 3012 and step 1022 are also similar.Specifically, in step 3012, can determine the second switching weight according to the cell size information of TeNB (such as, the diameter of Target cell or the transmitting power of TeNB), concrete grammar can comprise following two kinds:
Method 1, determines the second switching weight according to the size of predetermined Target cell and the second corresponding relation switched between weight.Under normal circumstances, the second switching weight of the larger correspondence in Target cell is less.The diameter of Target cell and second switches corresponding relation between weight can with reference to above-mentioned table 1.
Method 2, according to above-mentioned formula (1) calculate second switch weight, if according to formula (1) calculate second switch weight be greater than 1, then by second switch weight be set to 1.
In addition, if comprise the deployment information of cell-of-origin in auxiliary handoff information further, then in step 301, second can be upgraded according to the deployment information of cell-of-origin further and switch weight, concrete grammar comprises: judge whether cell-of-origin is identical with the coverage of Target cell according to the deployment information of cell-of-origin and the deployment information of Target cell or judge that the coverage of cell-of-origin is whether within the coverage of Target cell, if so, then switch weight by second further and be set to 0.
Afterwards, in upper handoff procedure once, the TTT triggering measurement that UE just can apply through dynamic conditioning has reported.
As can be seen from the above-described embodiment, on the one hand, said method can take into full account the switching historical information of UE when carrying out switching times counting, if UE is repeatedly switched to same community within a period of time, then these switchings can not be counted, thus effectively can solve the UE translational speed that causes when cell edge moves around as UE by the problem over-evaluated; On the other hand, said method can also take into full account the deployment information of cell-of-origin and Target cell when carrying out switching times counting, thus the accurate estimation of UE translational speed can be realized under HetNet network environment, because the intensive too high UE translational speed caused in community is by the problem over-evaluated under effective solution HetNet network environment.For these reasons, can be estimated the translational speed of UE by said method more accurately, adjustment obtains the TTT be applicable to, thus improves performance of handoffs, realizes lower handover failure rate, alleviates the impact of ping-pong simultaneously.
Further, in the above-mentioned methods, in order to carry out mobility status estimation more accurately, system is arranging the initial value TTT of TTT
0time can further consider average station distance (InterSite Distance, ISD) or network density.Such as, the initial value TTT of lower TTT is set when average station distance is less or network density is higher
0, and the initial value TTT of higher TTT is set when average station distance is comparatively large or network density is lower
0.
Embodiment 3
Fig. 5 shows the adjustment TTT method described in another embodiment of the present invention.As shown in Figure 5, the method mainly comprises:
Step 501: the initial value TTT pre-setting TTT
0.
As previously mentioned, system is arranging the initial value TTT of TTT
0time can further consider average station distance or network density.Such as, the initial value TTT of lower TTT is set when average station distance is less or network density is higher
0, and the initial value TTT of higher TTT is set when average station distance is comparatively large or network density is lower
0.
Step 502: pre-set n threshold value thre
1, thre
2..., thre
nand n the coefficient factor corresponding with this n threshold value
1, factor
2..., factor
n, meet 0<thre1<thre2< ... <thren and 1>factor
1>factor
2> ... >factor
n>0; Wherein, n is natural number.
Step 503:UE carries out toggle count, often occurs once to switch, and switching counter value HO_count adds 1.
Step 504:UE is according to an auxiliary handoff information adjustment said n threshold value or a said n coefficient;
In this step, UE can according to the network design information in auxiliary handoff information, and such as network density information or average station distance adjust a said n threshold value, and make the larger or average station distance of network density more hour, the value of n threshold value is larger.Or UE can also according to a history handover information adjustment said n threshold value of the UE in auxiliary handoff information, such as, if judge that this UE switches (prepare after predetermined a period of time NeiUECong community A switches away and again switch back community A) back and forth between neighbor cell according to the switching historical information of UE, increase the value of a said n threshold value, such as, add 1.
As the replacement scheme of such scheme, in this step, UE can also according to the network design information in auxiliary handoff information, and such as network density information or average station distance adjust a said n coefficient, make the larger or average station distance of network density more hour, the value of n coefficient is larger.Or UE can also according to a history handover information adjustment said n threshold value of the UE in auxiliary handoff information, such as, if judge that this UE switches (prepare after predetermined a period of time NeiUECong community A switches away and again switch back community A) back and forth between neighbor cell according to the switching historical information of UE, the value of a said n coefficient is increased.
Step 505: if kth+1 threshold value that HO_count is greater than a kth threshold value wherein and is less than wherein, if also namely meet thre
k< HO_count < thre
k+1, then TTT=TTT is made
0× factor
k, wherein k<n, and k is natural number; And if meet HO_count > thre
n, then TTT=TTT is made
0× factor
n.
As can be seen from the above-described embodiment, said method also can switch historical information adjustment TTT according to network design information and/or UE, make comparatively large in network density, when station spacing is less or UE switches back and forth between neighbor cell, reduce the speed turned down by TTT, realize the accurate estimation of UE translational speed, because the intensive too high UE translational speed caused in community is over-evaluated by the UE translational speed that the problem over-evaluated and UE cause when edge, neighbor cell switches back and forth under effective solution HetNet network environment, thus TTT is caused to be turned down too fast problem.For these reasons, can be estimated the translational speed of UE by said method more accurately, adjustment obtains the TTT be applicable to, thus improves performance of handoffs, realizes lower handover failure rate, alleviates the impact of ping-pong simultaneously.
The method of corresponding above-described embodiment 1, embodiments of the invention also proposed the base station eNB and user terminal UE that realize the method.
Fig. 6 shows a kind of internal structure of base station, and as shown in Figure 6, this base station comprises:
Auxiliary handoff information acquisition module 601, for obtaining the auxiliary handoff information of UE;
Switch weight determination module 602, for determining this switching weight switched according to the auxiliary handoff information of UE;
Switching command issues module 603, for issuing switching command to UE, and in switching command, carries above-mentioned switching weight.
Wherein, above-mentioned auxiliary handoff information acquisition module 601 other can store the entity that UE switches historical information from SeNB or network, and such as, MME, receives the switching historical information of UE.
Above-mentioned auxiliary handoff information acquisition module 601 can also obtain the deployment information of cell-of-origin and/or the deployment information of Target cell according to the method for step 101.
Above-mentioned switching weight determination module 602 can determine this switching weight switched according to the method for step 102 according to auxiliary handoff information.
Above-mentioned switching command issues module 603 can carry switching weight in switching command, and is handed down to UE by carrying the switching command switching weight.
Fig. 7 shows a kind of internal structure of user terminal, and as shown in Figure 7, this user terminal comprises:
Switching weight receiver module 701, switching weight for extracting from the switching command received;
Toggle count module 702, for carrying out toggle count according to the switching weight of carrying in switching command, obtains the switching times after upgrading; And
Triggered time adjusting module 703, for adjusting TTT according to the switching times after renewal.
Wherein, above-mentioned toggle count module can carry out the above-mentioned triggered time adjusting module of toggle count according to the method for step 104 can adjust TTT according to the method for the step 105 in Fig. 1, therefore has not repeated them here.
The method of corresponding above-described embodiment 2, embodiments of the invention also proposed the base station eNB and user terminal UE that realize the method.
Fig. 8 shows a kind of internal structure of base station, and as shown in Figure 8, this base station comprises:
Switching command issues module 801, for issuing switching command to UE, and in switching command, carries the deployment information of self.
Fig. 9 shows a kind of internal structure of user terminal, and as shown in Figure 9, this user terminal comprises:
Switch weight determination module 901, for determining this weight switched according to the auxiliary handoff information of self;
Toggle count module 902, for carrying out toggle count according to switching weight, obtains the switching times after upgrading; And
Triggered time adjusting module 903, for adjusting TTT according to the switching times after renewal.
Wherein, above-mentioned switching weight determination module 901 can determine this weight switched according to step 301; Above-mentioned toggle count module 902 can carry out toggle count according to the method for step 302; Above-mentioned triggered time adjusting module 903 according to the method adjustment TTT of step 303, therefore can not repeat them here.
The method of corresponding above-described embodiment 3, embodiments of the invention also proposed the user terminal UE realizing the method.
Figure 10 shows a kind of internal structure of user terminal, and as shown in Figure 10, this user terminal comprises:
Initialization module 1001, for pre-setting the initial value TTT of TTT
0;
Threshold setting module 1002, for pre-setting n threshold value thre
1, thre
2..., thre
nand n the coefficient factor corresponding with this n threshold value
1, factor
2..., factor
n, meet 0<thre1<thre2< ... <thren and 1>factor
1>factor
2> ... >factor
n>0; Wherein, n is natural number;
Toggle count module 1003, for carrying out toggle count, often occur once to switch, switching counter value HO_count adds 1;
Adjusting module 1004, for adjusting a said n threshold value or a said n coefficient according to auxiliary handoff information; And
Namely triggered time adjusting module 1005, if kth+1 threshold value that HO_count is greater than a kth threshold value wherein and is less than wherein, if also meet thre
k< HO_count < thre
k+1then, TTT=TTT is made
0× factor
k, wherein k<n, and k is natural number; And if meet HO_count > thre
n, then TTT=TTT is made
0× factor
n.
Wherein, the concrete operations of each module can each step in reference diagram 5, has also repeated no more at this.
As previously mentioned, method and apparatus of the present invention can adjust TTT comparatively accurately, thus realizes good performance of handoffs.
It should be noted that, although the method described in the embodiment of the present invention is applied in HetNet can obtain better effect, said method is not limited to be applied in HetNet, can also be applied in traditional HomoNet.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (26)
1. adjust a method of triggered time TTT, it is characterized in that, comprising:
When mobile terminal UE switches, target BS TeNB obtains the auxiliary handoff information of described UE;
TeNB determines this switching weight switched according to the auxiliary handoff information of described UE; And
TeNB issues switching command to UE, and in switching command, carry described switching weight.
2. method according to claim 1, is characterized in that, the supplementary that described UE switches comprises the switching historical information of described UE.
3. method according to claim 2, is characterized in that, comprises further: source base station SeNB stores the switching historical information of described UE, and after switch decision, the switching historical information of the described UE self stored is sent to TeNB.
4. method according to claim 2, is characterized in that, comprises further: Mobility Management Entity MME stores the switching historical information of described UE, and after switch decision, the switching historical information of the described UE self stored is sent to TeNB.
5. method according to claim 2, it is characterized in that, according to the auxiliary handoff information of described UE, TeNB determines that the switching weight that this switches comprises: determine the first switching weight according to the switching historical information of described UE, and switches the switching weight that switches as this of weight using determine first.
6. method according to claim 1, is characterized in that, the supplementary that described UE switches comprises the deployment information of Target cell;
According to the auxiliary handoff information of described UE, TeNB determines that the switching weight that this switches comprises: determine the second switching weight according to the deployment information of Target cell, and switches the switching weight that switches as this of weight using determine second.
7. method according to claim 1, is characterized in that, the supplementary that described UE switches comprises the switching historical information of described UE and the deployment information of Target cell;
According to the auxiliary handoff information of described UE, TeNB determines that the switching weight that this switches comprises:
The first switching weight is determined according to the switching historical information of described UE;
The second switching weight is determined according to the deployment information of Target cell; And
Select the switching weight that the minimum value in the first switching weight and the second switching weight switches as this.
8. the method according to claim 5 or 7, it is characterized in that, determine that the first switching weight comprises according to the switching historical information of described UE: if judge within predetermined a period of time according to the switching historical information of described UE, described UE switches away rear preparation from community A and again switches back community A, then switch weight by first and be set to 0; Otherwise, switch weight by first and be set to 1.
9. the method according to claim 6 or 7, is characterized in that, determines that the second switching weight comprises: determine the second switching weight according to Target cell size information according to the deployment information of Target cell.
10. the method according to claim 6 or 7, is characterized in that, the auxiliary handoff information of described UE comprises the deployment information of cell-of-origin further;
Described method comprises further: judge whether cell-of-origin is identical with the coverage of Target cell according to the deployment information of cell-of-origin and the deployment information of Target cell or judge that the coverage of cell-of-origin is whether within the coverage of Target cell, if so, then switch weight by second and be set to 0.
11. 1 kinds of methods adjusting triggered time TTT, is characterized in that, comprising:
UE carries out toggle count according to the switching weight of carrying in switching command, obtains the switching times after upgrading; And
UE is according to the switching times adjustment TTT after renewal.
12. methods according to claim 11, is characterized in that, UE carries out toggle count according to the switching weight in switching command and comprises: UE carries out toggle count according to following formula:
Wherein, HO_count represents the switching times of UE record;
represent the switching weight of carrying in switching command.
13. 1 kinds of methods adjusting triggered time TTT, is characterized in that, comprising:
UE determines this weight switched according to the auxiliary handoff information of self;
UE carries out toggle count according to switching weight, obtains the switching times after upgrading; And
UE is according to the switching times adjustment TTT after renewal.
14. method according to claim 13, is characterized in that, described auxiliary handoff information comprises the switching historical information that UE self stores;
According to the auxiliary handoff information of self, described UE determines that the switching weight that this switches comprises: described UE determines the first switching weight according to the switching historical information self stored, and switches the switching weight that switches as this of weight using determine first.
15. methods according to claim 13, is characterized in that, described auxiliary handoff information comprises the deployment information of Target cell;
According to the auxiliary handoff information of self, described UE determines that the switching weight that this switches comprises: described UE determines the second switching weight according to the deployment information of TeNB, and switches the switching weight that switches as this of weight using determine second.
16. methods according to claim 13, is characterized in that, described auxiliary handoff information comprises the deployment information of the Target cell that the switching historical information of UE and target BS TeNB provide;
According to the auxiliary handoff information of self, described UE determines that the weight that this switches comprises:
UE determines the first switching weight according to the switching historical information self stored;
The deployment information of the Target cell that UE provides according to TeNB determines the second switching weight; And
Select first to switch weight and second and switch the switching weight of the minimum value in weight as current switching.
17. methods according to claim 14 or 16, it is characterized in that, according to the switching historical information self stored, UE determines that the first switching weight comprises:
If judge within predetermined a period of time according to the switching historical information of described UE, described UE switches away rear preparation from community A and again switches back community A, then switch weight by first and be set to 0; Otherwise, switch weight by first and be set to 1.
18. methods according to claim 15 or 16, it is characterized in that, according to the deployment information of Target cell, UE determines that the second switching weight comprises: determine the second switching weight according to Target cell size information.
19. methods according to claim 15 or 16, it is characterized in that, the auxiliary handoff information of described UE comprises the deployment information of cell-of-origin further;
Described method comprises further: judge whether cell-of-origin is identical with the coverage of Target cell according to the deployment information of cell-of-origin and the deployment information of Target cell or judge that the coverage of cell-of-origin is whether within the coverage of Target cell, if so, then switch weight by second and be set to 0.
20. methods according to claim 13, is characterized in that, UE carries out toggle count according to switching weight and comprises: UE carries out toggle count according to following formula:
Wherein, HO_count represents the switching times of UE record;
represent the switching weight that this switches.
21. 1 kinds of methods adjusting triggered time TTT, is characterized in that, comprising:
Pre-set the initial value TTT of TTT
0;
Pre-set n threshold value thre
1, thre
2..., thre
nand n the coefficient factor corresponding with a described n threshold value
1, factor
2..., factor
n, meet 0<thre1<thre2< ... <thren and 1>factor
1>factor
2> ... >factor
n>0; Wherein, n is natural number;
UE carries out toggle count, often occurs once to switch, and switching counter value HO_count adds 1;
UE adjusts a described n threshold value or a described n coefficient according to the auxiliary handoff information of UE;
If meet thre
k< HO_count < thre
k+1then, TTT=TTT is made
0× factor
k, wherein, k<n, and k is natural number;
If meet HO_count > thre
n, then TTT=TTT is made
0× factor
n.
22. 1 kinds of base stations, is characterized in that, comprising:
Auxiliary handoff information acquisition module, for obtaining the auxiliary handoff information of user terminal UE;
Switch weight determination module, for determining this switching weight switched according to the auxiliary handoff information of UE; And
Switching command issues module, for issuing switching command to UE, and in switching command, carries described switching weight.
23. 1 kinds of user terminal UE, is characterized in that, comprising:
Switching weight receiver module, switching weight for extracting from the switching command received;
Toggle count module, for carrying out toggle count according to the switching weight in switching command, obtains the switching times after upgrading; And
Triggered time adjusting module, for adjusting triggered time TTT according to the switching times after renewal.
24. 1 kinds of base stations, is characterized in that, comprising:
Switching command issues module, for issuing switching command to UE, and in switching command, carries the deployment information of self.
25. 1 kinds of user terminal UE, is characterized in that, comprising:
Switch weight determination module, for determining this weight switched according to the auxiliary handoff information of self;
Toggle count module, for carrying out toggle count according to switching weight, obtains the switching times after upgrading; And
Triggered time adjusting module, for adjusting triggered time TTT according to the switching times after renewal.
26. 1 kinds of user terminal UE, is characterized in that, comprising:
Initialization module, for pre-setting the initial value TTT of triggered time TTT
0;
Threshold setting module, for pre-setting n threshold value thre
1, thre
2..., thre
nand n the coefficient factor corresponding with this n threshold value
1, factor
2..., factor
n, meet 0<thre1<thre2< ... <thren and factor
1>factor
2> ... >factor
n>0; Wherein, n is natural number;
Toggle count module, for carrying out toggle count, often occur once to switch, switching counter value HO_count adds 1;
Threshold adjustment module, for adjusting a described n threshold value or a described n coefficient according to the auxiliary handoff information of self; And
Triggered time adjusting module, if meet thre
k< HO_count < thre
k+1then, TTT=TTT is made
0× factor
k, wherein, k<n, and k is natural number;
If meet HO_count > thre
n, then TTT=TTT is made
0× factor
n.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310228505.9A CN104244318A (en) | 2013-06-08 | 2013-06-08 | Method and device for adjusting time to trigger |
| JP2014110346A JP6444617B2 (en) | 2013-06-08 | 2014-05-28 | Method and apparatus for adjusting trigger time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310228505.9A CN104244318A (en) | 2013-06-08 | 2013-06-08 | Method and device for adjusting time to trigger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104244318A true CN104244318A (en) | 2014-12-24 |
Family
ID=52136225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310228505.9A Pending CN104244318A (en) | 2013-06-08 | 2013-06-08 | Method and device for adjusting time to trigger |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6444617B2 (en) |
| CN (1) | CN104244318A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110178407A (en) * | 2017-01-16 | 2019-08-27 | 瑞典爱立信有限公司 | Link switching in wireless communication system |
| CN112135332A (en) * | 2019-06-24 | 2020-12-25 | 中兴通讯股份有限公司 | Information management method, auxiliary node changing method, node, and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873659A (en) * | 2009-04-21 | 2010-10-27 | 中兴通讯股份有限公司 | Implementation method and device for reporting measurement reports |
| CN101959239A (en) * | 2009-07-20 | 2011-01-26 | 中兴通讯股份有限公司 | Historical cell information application method, target cell switching confirmation method and system |
| CN101998563A (en) * | 2009-08-13 | 2011-03-30 | 中兴通讯股份有限公司 | Method for preventing pingpang handover between neighboring cells and evolved node B |
| CN102859905A (en) * | 2010-04-27 | 2013-01-02 | 三星电子株式会社 | Apparatus and method for providing handover support information in mobile communication system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120014308A1 (en) * | 2009-11-11 | 2012-01-19 | Samsung Electronics Co., Ltd. | Methods and apparatus to support reconfiguration in self organized wireless communications and networks |
| EP2385725A1 (en) * | 2010-05-03 | 2011-11-09 | Alcatel Lucent | Method of performing a handover procedure in a wireless telecommunication network |
| JP5907074B2 (en) * | 2010-12-28 | 2016-04-20 | 日本電気株式会社 | Handover control method, control device, adjustment device, and program |
| US20130040692A1 (en) * | 2011-08-11 | 2013-02-14 | Mediatek, Inc. | Method of Heterogeneous Network Mobility |
| US9220041B2 (en) * | 2011-09-30 | 2015-12-22 | Nokia Technologies Oy | Mobility enhancement for fast moving user equipment in a heterogenous network environment |
-
2013
- 2013-06-08 CN CN201310228505.9A patent/CN104244318A/en active Pending
-
2014
- 2014-05-28 JP JP2014110346A patent/JP6444617B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873659A (en) * | 2009-04-21 | 2010-10-27 | 中兴通讯股份有限公司 | Implementation method and device for reporting measurement reports |
| CN101959239A (en) * | 2009-07-20 | 2011-01-26 | 中兴通讯股份有限公司 | Historical cell information application method, target cell switching confirmation method and system |
| CN101998563A (en) * | 2009-08-13 | 2011-03-30 | 中兴通讯股份有限公司 | Method for preventing pingpang handover between neighboring cells and evolved node B |
| CN102859905A (en) * | 2010-04-27 | 2013-01-02 | 三星电子株式会社 | Apparatus and method for providing handover support information in mobile communication system |
Non-Patent Citations (4)
| Title |
|---|
| CATT, CATR: "Cell Type Based Handover for Hetnet", 《3GPP TSG RAN WG2 MEETING #79 R2-123343》 * |
| MEDIATEK: "Enhanced Mobility State Estimation for HetNet", 《3GPP TSG RAN WG2 MEETING #78 R2-122834》 * |
| NOKIA SIEMENS NETWORKS， NOKIA CORPORATION: "Enhanced Mobility State Estimation", 《3GPP TSG-RAN WG2 MEETING #81BIS R2-131422》 * |
| NOKIA SIEMENS NETWORKS, NOKIA CORPORATION: "Improved mobility performance by applying Gray-listing", 《3GPP TSG-RAN WG2 MEETING #81BIS R2-131420》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110178407A (en) * | 2017-01-16 | 2019-08-27 | 瑞典爱立信有限公司 | Link switching in wireless communication system |
| US11729681B2 (en) | 2017-01-16 | 2023-08-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Link switch in a wireless communication system |
| CN112135332A (en) * | 2019-06-24 | 2020-12-25 | 中兴通讯股份有限公司 | Information management method, auxiliary node changing method, node, and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6444617B2 (en) | 2018-12-26 |
| JP2014239433A (en) | 2014-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10848983B2 (en) | Communications device and method | |
| US20180227824A1 (en) | Method of Heterogeneous Network Mobility | |
| EP2800412B1 (en) | Method and system for measurement and handover reliability enhancement in a wireless communication system | |
| KR101722204B1 (en) | Apparatus and method for providing handover support inforamtion in mobile communication system | |
| US20110098042A1 (en) | Apparatus and Method for Deriving Idle Mode Parameters for Cell Selection/Reselection | |
| EP2749082B1 (en) | Adapting a triggering threshold for cell re-selection measurements | |
| EP2728937B1 (en) | Cell changing method and device | |
| CN104080118B (en) | The method, apparatus and system of biasing adjustment about cell coverage expansion | |
| CN102474777B (en) | Apparatus and method for determining mobility state in wireless communication system | |
| EP2938118A1 (en) | Method, apparatus and communication node for measurement | |
| KR20090030907A (en) | Methods of cell selection in mobile communication system | |
| WO2013189310A1 (en) | Control method for cognitive radio system, base station and neighbour relationship | |
| WO2021019680A1 (en) | Terminal, base station, and wireless communication method | |
| Tesema et al. | Evaluation of adaptive active set management for multi-connectivity in intra-frequency 5G networks | |
| KR20150034717A (en) | Method for reporting mobility state information in wireless communication system, and apparatus for supporting same | |
| CN104244342B (en) | A kind of user's mobile status method of estimation for LTE A heterogeneous networks | |
| KR101737398B1 (en) | Method and apparatus for handover control and handover blacklist management in a mobile communication system | |
| CN104244318A (en) | Method and device for adjusting time to trigger | |
| Khwandah et al. | Energy efficient mobility enhancement in LTE pico–macro HetNet systems | |
| JP2017509225A (en) | Cell switching for non-CA based ICIC with enhanced radio resource management (RRM) for LTE methods and apparatus | |
| EP2532193A1 (en) | Method and apparatus for cross mode mobility optimization | |
| KR101831689B1 (en) | Apparatus and method for providing handover support inforamtion in mobile communication system | |
| Jadhav et al. | Energy-efficient method for handover in lte femtocell networks | |
| KR101680478B1 (en) | Method and apparatus for handover control and handover blacklist management in a mobile communication system | |
| WO2015117153A1 (en) | Range tuning for open access small cells |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AD01 | Patent right deemed abandoned | ||
| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20191108 |