CN104581849B - A kind of cell switching method - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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Abstract
The present invention relates to a kind of cell switching methods, belong to wireless communication technology field.Include the following steps：1) UE persistently detects current service cell and neighboring community Reference Signal Received Power RSRP, and judge whether to meet handover triggering condition after carrying out data smoothing to RSRP, if satisfied, then triggered time TTT timers start timing, and step 2) is performed, otherwise continue to detect RSRP；2) UE sends pre-switch request message to current service cell, and current service cell determines UE pre-switch candidate cell collection according to the message of reception；3) notice pre-switch candidate cell in current service cell performs pre-switch and prepares；4) if TTT fails, UE detects that handover triggering condition still meets, then sends switching instruction to current service cell；5) current service cell determines switching target small area according to measurement report；6) notice switching target small area in current service cell performs switching.This method can effectively reduce ping-pong and handover delay, improve switching user QoS experience.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and relates to a cell switching method.
Background
With the rapid development of wireless communication technology, various intelligent terminals show an explosive growth trend, abundant and diverse data services are emerging, and user high-rate service needs to provide a severe challenge for a traditional cellular network. In the heterogeneous cellular network technology, low-power nodes such as relay stations, picocell stations, home base stations and the like are introduced into the coverage range of the traditional macrocell, so that the coverage of a specific area is enhanced in a targeted manner, multi-layer network coverage is formed, the QoS guarantee of a user can be effectively realized, and the utilization rate of system resources is improved. Network characteristics such as irregular low-power node deployment, large difference in coverage area and the like in the heterogeneous cellular network and characteristics such as different user moving speeds and different service demand characteristics all bring difficulties and challenges to the handover control technology of the heterogeneous cellular network.
Currently, research has been conducted to consider heterogeneous cellular network user handover performance improvement schemes. A pre-switch preparation mechanism is proposed in the proposal [3GPP Tdoc R2-132375.Performance analysis on EarlyHOPrepreparation and EarlyHO CMD.ZTE corporation.2013 ]. The current serving cell sends a pre-handover preparation message to the pre-handover candidate cell before handover execution, and informs the pre-handover candidate cell to perform resource reservation, thereby effectively reducing the probability of handover failure. In addition, in the existing research, the received signal strength of the user is mainly considered for selecting the target cell, and the service characteristics after the user is switched to the target cell are not considered, which may cause that the QoS experience of the user cannot be guaranteed. Therefore, how to comprehensively consider multiple factors such as the user handover success rate, the characteristics of the handover candidate cell and the target cell, and the user QoS experience, and designing an efficient handover method becomes an urgent problem to be solved.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a cell switching method, which includes:
a cell switching method comprises the following steps:
the method comprises the following steps: the User Equipment (UE) continuously detects the Reference Signal Received Power (RSRP) of the current service cell and the adjacent cell, and judges whether a switching trigger condition is met or not after data smoothing is carried out on the RSRP, if so, a Time To Trigger (TTT) timer is started, and the step two is executed, otherwise, the RSRP is continuously detected;
step two: UE sends a pre-switching request to a current service cell, wherein the pre-switching request comprises a self state and an adjacent cell state; the current service cell determines a UE pre-switching candidate cell set according to the received information;
step three: the current service cell informs the pre-switching candidate cell to execute pre-switching preparation;
step four: if the TTT is invalid and the UE detects that the switching triggering condition is still met, the UE sends a switching instruction to the current service cell, wherein the switching instruction comprises a measurement report of the current cell and an adjacent cell;
step five: the current service cell determines a switching target cell according to the measurement report;
step six: the current service cell informs the switching target cell to execute the switching.
Further, in step one, the UE continuously detects reference signal received powers RSRP of the current serving cell and the neighboring cell, and obtains the reference signal received powers RSRP after smoothing the RSRP by an exponential averaging filters(t), the filter model used is as follows:
RSRPs(t)＝kRSRPr(t-1)+(1-k)RSRPr(t)
wherein, RSRPs(t) denotes the filter output value, RSRP, at time tr(t) denotes the reference signal received power received at time t, i.e., the filter input value, and k denotes the filter smoothing parameter.
Further, the switching trigger condition isThe RSRP difference value of the adjacent cell after smoothing with the current service cell is higher than a trigger threshold value; if soRepresents the smoothed RSRP of the current serving cell toRepresenting the smoothed RSRP of the ith adjacent cell, and the handover trigger condition is represented as: presence of i, satisfyWherein, RSRPthIs a trigger threshold value.
Further, in step two, the pre-handover request message sent by the UE to the current serving cell includes a self-state and a neighboring cell state, where the self-state of the UE includes the current moving speed and direction of the UE.
Further, in step two, the current serving cell determines the UE pre-handover candidate cell set according to the UE self-state and the neighboring cell state, and specifically includes:
1) the current service cell judges whether to execute switching according to the UE moving speed, if the UE speed V is less than or equal to Vth，VthIf the threshold value is the moving speed threshold value, step 2) can be executed; otherwise, the current service cell terminates selecting pre-switching candidate cells for the UE;
2) the current serving cell performs first screening on the neighboring cells according to the RSRP difference between the neighboring cells reported by the UE and the current serving cell, specifically as follows: the difference value of the RSRP of the adjacent cell and the current service cell is compared with the preset delta RSRPthComparing, if greater than Δ RSRPthThen the neighboring cell can be used as a pre-handover candidate cell; otherwise, the adjacent cell is not taken as a pre-switching candidate cell;
3) the current service cell forms an included angle with the adjacent cell according to the moving direction of the UEAnd performing secondary screening on the pre-switching candidate cell, specifically as follows: to be provided withIndicating the included angle between the connection line between the base station of the ith handover candidate cell and the UE and the moving direction of the UE, if the included angle is larger than the set value, the UE moves in the moving direction of the ith handover candidate cellConfirming the cell as a user pre-switching candidate cell; if it isThe cell is not considered as a pre-handover candidate cell. After secondary screening, a UE pre-switching candidate cell set can be obtained.
Further, in step three, the informing, by the current serving cell, of the pre-handover candidate cell to perform pre-handover preparation specifically includes:
1) the current service cell sends pre-switching preparation information to the pre-switching candidate cell;
2) the pre-switching candidate cell receives the pre-switching preparation message, executes resource reservation and sends a pre-switching preparation response message to the current serving cell;
3) the current serving cell receives the pre-handover preparation response message and transmits the pre-handover request response message to the UE.
Further, in step five, the determining, by the current serving cell, a handover target cell according to the measurement report specifically includes:
1) smoothing of pre-handover candidate cells received at the UE by the current serving cell acquisitionAnd pre-switching candidate cell available bandwidth BiI is more than or equal to 1 and less than or equal to N, wherein N is the number of pre-handover candidate cells;
2) the current service cell estimates U according to the information of the UE pre-switching candidate cellE transmission rate after switching to pre-switching candidate cell, in RiThe transmission rate after the UE is identified to be switched to the ith cell can be obtained
Wherein,the RSRP, N of the UE arrived at by the jth cell with the same frequency as the ith celliFor the number of cells of the same frequency as the ith cell, σ2Is the noise power; the current serving cell selects a pre-switching candidate cell with the maximum corresponding transmission rate as a switching target cell, namely: i.e. i*＝argmaxRi。
The invention has the beneficial effects that:
1) the invention can estimate the reference signal received power RSRP of each cell received by the UE more accurately, reduces the influence of data mutation on switching judgment and effectively avoids ping-pong effect.
2) The pre-switching candidate cell selection method can effectively reduce the number of pre-switching preparation cells, thereby reducing the waste of cell reserved resources and reducing the signaling overhead.
3) The target cell selection method in the invention selects the target cell based on the transmission rate after the UE is switched to the target cell, thereby effectively ensuring the QoS experience of the switched UE.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is a diagram of a heterogeneous cellular network scenario;
FIG. 2 is a schematic flow chart of the method of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a diagram of a heterogeneous cellular network scenario in which there are 7 low power cells in a macro cell coverage area, each low power cell not sharing a frequency band with the macro cell, where cell A, C and F share frequency band F1Cell B, E, G sharing frequency band f2Frequency band f is exclusively shared by cell D3. The UE detects Reference Signal Received Power (RSRP) of macro cells and low-power cells in the moving process, and if the UE detects that a handover triggering condition is met and the condition is still met after a Time To Trigger (TTT), the handover is executed.
Fig. 2 is a flowchart of a cell switching method according to the present invention. As shown in the figure, the cell switching method of the present invention specifically includes:
s1: the current service cell sends a measurement control message to the UE, and the UE carries out measurement parameter configuration through the measurement control message and carries out periodic detection on the current service cell and the adjacent cell.
S2: the UE detects whether a handover trigger condition is satisfied. The handover trigger condition is defined as:wherein,represents the smoothed RSRP value of the current serving cell,and the smoothed RSRP value of the ith adjacent cell is represented. UE obtains the reference signal received power RSRP after smoothing by adopting an exponential averaging filters(t), the filter model used is: RSRPs(t)＝kRSRPr(t-1)+(1-k)RSRPr(t) of (d). If the switching triggering condition is met, the UE sends a pre-switching request message to the current serving cell, and a TTT timer starts to time; otherwise, the UE continues to detect the RSRP values of the current serving cell and the adjacent cells.
S3: and the UE sends a pre-switching request message to the current serving cell, wherein the pre-switching request message comprises the self moving speed and the moving direction of the UE. The current serving cell selects a pre-switching candidate cell according to the UE moving state, and the specific selection process is as follows: (1) the current service cell judges whether to execute switching according to the UE moving speed; if V is less than or equal to VthIf yes, executing the step (2); otherwise, the current service cell stops selecting a pre-switching candidate cell set for the UE; (2) the current service cell carries out primary screening on the adjacent cells according to the RSRP difference value of the adjacent cells reported by the UE and the current service cell, and the screening criterion is as follows: the difference value of the RSRP between the adjacent cell and the current service cell and a preset threshold value delta RSRP are comparedthComparing, if greater than Δ RSRPthThen the neighboring cell can be used as a pre-handover candidate cell; otherwise, the adjacent cell is not taken as a pre-switching candidate cell; (3) the current service cell forms an included angle with the adjacent cell according to the moving direction of the UEAnd carrying out secondary screening on the pre-switching candidate cells, wherein the screening preparation is as follows: to be provided withIndicating the included angle between the connection line between the base station of the ith handover candidate cell and the UE and the moving direction of the UE, if the included angle is larger than the set value, the UE moves in the moving direction of the ith handover candidate cellIf the UE moves towards the direction adjacent to the cell, the cell is determined to be a UE pre-switching candidate cell; if it isIt indicates that the UE is moving away from this cell, which is not a pre-handover candidate cell. And the UE pre-switching candidate cell set can be obtained through secondary screening.
S4: the current service cell selects a pre-switching candidate cell for the UE and then sends a pre-switching preparation message to the pre-switching candidate cell; the pre-switching candidate cell receives the pre-switching preparation message, executes resource reservation, sends a pre-switching preparation response message to the current serving cell and informs the current serving cell of ready switching; and the current serving cell sends a pre-switching request response message to the UE after receiving the pre-switching preparation response, and informs the UE that the pre-switching preparation is completed.
S5: UE continues to detect the RSRP values of the current serving cell and the adjacent cells, and if the TTT timer is over, the switching triggering condition is still met, namelyThe UE sends a handover indication message to the current serving cell.
S6: after receiving the switching instruction, the current serving cell selects a target cell by taking the transmission rate of the UE after switching to the target cell as a consideration, specifically: method for acquiring pre-handover candidate cell at UE by current serving cellValue and pre-handover candidate cell available bandwidth BiI is more than or equal to 1 and less than or equal to N, wherein N is the number of UE neighbor cells; the current service cell estimates the transmission rate after the UE is switched to the pre-switching candidate cell according to the information of the pre-switching candidate cell, and the transmission rate is RiThe transmission rate after the UE is switched to the ith cell is identified and obtained
Wherein,the RSRP, N of the base station of the jth cell reaching the UE is the same frequency as the ith celliNumber of co-channel cells, σ, for ith cell2Is the noise power;the current cell base station selects the candidate handover cell with the maximum corresponding transmission rate as the handover target cell, namely: i.e. i*＝argmaxRi。
S7: and the current service cell sends a switching indication response message to the UE and starts to execute a switching process. After the switching process is finished, the current service cell sends a resource release message to other pre-switching candidate cells and informs the other pre-switching candidate cells to release the switching reserved resources.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (1)
1. A method of cell handover, characterized by: the method comprises the following steps:
the method comprises the following steps: the User Equipment (UE) continuously detects the Reference Signal Received Power (RSRP) of the current service cell and the adjacent cell, and judges whether a switching trigger condition is met or not after data smoothing is carried out on the RSRP, if so, a Time To Trigger (TTT) timer is started, and the step two is executed, otherwise, the RSRP is continuously detected;
step two: UE sends a pre-switching request to a current service cell, wherein the pre-switching request comprises a self state and an adjacent cell state; the current service cell determines a UE pre-switching candidate cell set according to the received information;
step three: the current service cell informs the pre-switching candidate cell to execute pre-switching preparation;
step four: if the TTT is invalid and the UE detects that the switching triggering condition is still met, the UE sends a switching instruction to the current service cell, wherein the switching instruction comprises a measurement report of the current cell and an adjacent cell;
step five: the current service cell determines a switching target cell according to the measurement report;
step six: the current service cell informs the switching target cell to execute switching;
in step two, the pre-switching request message sent by the UE to the current service cell comprises a self state and an adjacent cell state, wherein the self state of the UE comprises the current moving speed and direction of the UE;
in step two, the current serving cell determines the UE pre-handover candidate cell set according to the UE self-state and the neighboring cell state, and specifically includes:
1) the current service cell judges whether to execute switching according to the UE moving speed, if the UE speed V is less than or equal to Vth，VthIf the threshold value is the moving speed threshold value, step 2) can be executed; otherwise, the current service cell terminates selecting pre-switching candidate cells for the UE;
2) the current serving cell performs first screening on the neighboring cells according to the RSRP difference between the neighboring cells reported by the UE and the current serving cell, specifically as follows: the difference value of the RSRP of the adjacent cell and the current service cell is compared with the preset delta RSRPthComparing, if greater than Δ RSRPthThen the neighboring cell can be used as a pre-handover candidate cell; otherwise, the adjacent cell is not taken as a pre-switching candidate cell;
3) the current service cell forms an included angle with the adjacent cell according to the moving direction of the UEAnd performing secondary screening on the pre-switching candidate cell, specifically as follows: to be provided withIndicating the included angle between the connection line between the base station of the ith handover candidate cell and the UE and the moving direction of the UE, if the included angle is larger than the set value, the UE moves in the moving direction of the ith handover candidate cellConfirming the cell as a user pre-switching candidate cell; if it isThe cell is not taken as a pre-handover candidate cell; after secondary screening, a UE pre-switching candidate cell set can be obtained;
in step one, the UE continuously detects reference signal received power RSRP of the current service cell and the adjacent cell, and obtains the reference signal received power RSRP after smoothing by an exponential averaging filters(t), the filter model used is as follows:
RSRPs(t)＝kRSRPr(t-1)+(1-k)RSRPr(t)
wherein, RSRPs(t) denotes the filter output value, RSRP, at time tr(t) denotes a reference signal received power received at time t, i.e., a filter input value, and k denotes a filter smoothing parameter;
the switching triggering condition is that the RSRP difference value after the adjacent cell and the current service cell are smoothed is higher than a triggering threshold value; if soRepresenting the smoothed RSRP of the current serving cell as the RSRPi sRepresenting the smoothed RSRP of the ith adjacent cell, and the handover trigger condition is represented as: presence of i, satisfyWherein, RSRPthIs a trigger threshold value;
in step three, the current serving cell notifies the pre-handover candidate cell to perform pre-handover preparation, which specifically includes:
1) the current service cell sends pre-switching preparation information to the pre-switching candidate cell;
2) the pre-switching candidate cell receives the pre-switching preparation message, executes resource reservation and sends a pre-switching preparation response message to the current serving cell;
3) the current service cell receives the pre-switching preparation response message and sends the pre-switching request response message to the UE;
in step five, the determining, by the current serving cell, a handover target cell according to the measurement report specifically includes:
1) current serving cell acquisition pre-handover candidate cell smoothed RSRP received at UEi sAnd pre-switching candidate cell available bandwidth BiI is more than or equal to 1 and less than or equal to N, wherein N is the number of pre-handover candidate cells;
2) the current service cell estimates the transmission rate after the UE is switched to the pre-switching candidate cell according to the information of the UE pre-switching candidate cell, and the transmission rate is RiThe transmission rate after the UE is identified to be switched to the ith cell can be obtained
Wherein,the RSRP, N of the UE arrived at by the jth cell with the same frequency as the ith celliFor the number of cells of the same frequency as the ith cell, σ2Is the noise power; the current serving cell selects a pre-switching candidate cell with the maximum corresponding transmission rate as a switching target cell, namely: i.e. i*＝argmaxRi。
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