CN105557025A - Cell handover method and device - Google Patents

Cell handover method and device Download PDF

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Publication number
CN105557025A
CN105557025A CN201480000686.2A CN201480000686A CN105557025A CN 105557025 A CN105557025 A CN 105557025A CN 201480000686 A CN201480000686 A CN 201480000686A CN 105557025 A CN105557025 A CN 105557025A
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CN
China
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terminal
moment
channel quality
serving cell
neighboring community
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CN201480000686.2A
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Chinese (zh)
Inventor
朱晓荣
徐杰
邢平平
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华为技术有限公司
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Priority to PCT/CN2014/075971 priority Critical patent/WO2015161453A1/en
Publication of CN105557025A publication Critical patent/CN105557025A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Abstract

The present invention discloses a cell handover method and device. By means of predicting the channel quality of a serving cell of a terminal at the next moment, the terminal is enabled to make a handover preparation before a channel of the serving cell fades to be unable to transmit a data packet. On the premise of ensuring the normal transmission of the data packet, channel resources of the serving cell are utilized to the maximum extent, thereby realizing seamless handover. The terminal comprises: a prediction module for predicting, when the current monitoring moment ti arrives, the channel quality of a serving cell providing a service for the terminal currently and of at least one neighbour cell of the serving cell at the next monitoring moment ti+1, where ti+1 = ti + T, T is a set monitoring period, and i = 0, 1, 2,...; and a processing module for executing, according to the predicted channel quality of the serving cell and the predicted channel quality of the at least one neighbour cell, a cell handover process of the terminal.

Description

A kind of cell switching method and equipment

Technical field

The present invention relates to wireless communication technology field, in particular to a kind of cell switching method and equipment.Background technique

Cell switching refers to the process of that the terminal under connection status is transferred to another cell from a cell.At present, cell switching flow is the network-control switching by terminal auxiliary, referring specifically to shown in Fig. 1, when terminal serving cell channel quality lower than setting measurement thresholding (such as, set Reference Signal Received Quality (Reference Signal Received Quality, RSRQ threshold value), is denoted as RSRQThr) when, will triggering terminal (the handover measurement moment is denoted as ^) is measured to adjacent cell, and measurement report is reported to network side, if the channel quality of adjacent cell is not less than setting handoff threshold, triggering terminal is switched to the handover operation of the adjacent cell from serving cell, and (the pre-switch moment is denoted as Tn);After completing handoff procedure, (the switching completion moment is denoted as T to terminal access adjacent celln+1 )。

It can be seen that from above-mentioned handoff procedure, under existing handover mechanism, it reports from starting to measure measurement report and triggers switching, need hundreds of milliseconds to the several seconds time, it is completed from switching is initiated a switch to, it is also desirable to the time of hundreds of milliseconds to several seconds, due to needing longer time, and during this period of time the channel quality of serving cell may become very poor, so as to lead to handover failure.

With the growth of user demand and the development of the communication technology, long term evolution enhances (Long Term Evolution- Advanced, LTE- Advanced) in system, there is the region of heterogeneous network overlapping covering, heterogeneous network changes the topological structure of conventional cellular network, multiple and different network nodes can be disposed simultaneously in the same area, network deployment is more flexible, while also improving cell capacity and wireless link rate.Typical heterogeneous network includes: macro base station (Macro) and the cordless communication network that micro-base station (Pico) is constituted, and can also include Home eNodeB (Femto) and relay base station (Relay) etc. in the cordless communication network.In above-mentioned heterogeneous network, Macro cell is used to provide the wide area covering on basis for user;Pico cell improves the capacity in hot spot service area, for providing small-scale covering to achieve the purpose that balance the load of Macro cell;Femto cell can be a for providing small-scale covering People user provides better service quality, such as obtains higher service rate, higher-quality link;Relay cell is used to extend the covering of Macro cell edge, or is deployed in the place for being inconvenient to dispose wire-line back haul.

With the diversification of type of business and mobile rapid of user, existing cell handover mechanism has been unable to meet the demand of user experience quality, how handover delay is reduced in fast moving, avoid handover failure, unnecessary switching is reduced simultaneously, the Quality of experience for guaranteeing user becomes a major issue of current cell switching research.Summary of the invention

The embodiment of the invention provides a kind of cell switching method and equipment, by the channel quality for predicting the serving cell of subsequent time terminal, make the terminal that can carry out switching before serving cell channel declines to and can not transmit data packet to prepare, under the premise of guaranteeing data packet normal transmission, maximally utilise the channel resource of serving cell, realizes seamless switching.

In a first aspect, a kind of cell switching method, this method comprises:

In the currently monitored moment ttWhen arrival, prediction is current to provide the serving cell of service and at least one neighboring community of the serving cell at next monitoring moment for terminal+1Channel quality, wherein tM ^ tt+ T, for the monitoring cycle of setting ,=0,1,2 ...;

The channel quality of at least one neighboring community described according to the channel quality of the serving cell predicted and predicting, executes the cell switch process of the terminal.

With reference to first aspect, in the first possible implementation, according to the channel quality of the serving cell predicted and described in predicting at least one neighboring community channel quality, execute the cell switch process of the terminal, comprising:

When threshold value of the channel quality of the serving cell predicted lower than setting, exist according to the neighboring community each of is predicted+1The channel quality at moment selects a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell. With reference to first aspect, in the second possible implementation, initial monitor moment ^) it is at the time of setting at random, alternatively, at the time of to meet the trigger condition of setting.

The possible implementation of second with reference to first aspect, in the third possible implementation, the trigger condition include threshold value of the signal quality lower than setting of the current serving cell of terminal.

With reference to first aspect, the third possible implementation of the possible implementation of the first of first aspect, second of possible implementation of first aspect or first aspect, in the fourth possible implementation, predict that the serving cell and the neighboring community exist+1The channel quality at moment, comprising: according to Gauss-Markov mobility model, predict the serving cell and the neighboring community+1The channel quality at moment.

The 4th kind of possible implementation with reference to first aspect according to Gauss-Markov mobility model, predicts the serving cell and the neighboring community in t in a fifth possible implementationMThe channel quality at moment, comprising:

The terminal is obtained in the location information at moment, the location information includes movement speed and moving direction of the terminal at the moment;

Location information according to the terminal at the moment predicts that the terminal exists+1The location information at moment;And

According to the location information that prediction obtains, predict the serving cell and the neighboring community in the channel quality at t moment.

The 5th kind of possible implementation with reference to first aspect according to the location information that prediction obtains, predicts the serving cell and the neighboring community in the channel quality at t moment in a sixth possible implementation, comprising:

According to the location information that prediction obtains, the range information of base station belonging to the terminal to the serving cell and the neighboring community is determined respectively;

According to the range information of base station belonging to the terminal to the serving cell determined, using yin The path loss algorithm of shadow decline, predicts the serving cell and exists+1The channel quality at moment;And the range information of the base station according to belonging to the terminal to the neighboring community determined predicts the neighboring community in t using the path loss algorithm of shadow fadingMThe channel quality at moment.

The possible implementation of with reference to first aspect the first exists in the 7th kind of possible implementation according to the neighboring community each of is predictedΜThe channel quality at moment, select a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell, comprising: exist in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted according to the terminal+1The channel quality at moment executes the cell switch process of the terminal.

The 7th kind of possible implementation with reference to first aspect, in the 8th kind of possible implementation, according to the terminal the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted the t moment channel quality, execute the cell switch process of the terminal, comprising:

If the macrocell in the first threshold value and the neighboring community that movement speed of the terminal at the moment is greater than setting is in tMThe macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell not less than the threshold value of setting by the channel quality at moment;Or

If the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, and the macrocell in the neighboring community is in tMThe macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value not less than the threshold value of setting by the channel quality at moment;Or

If the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is non-real-time service, from the adjacent of prediction The neighboring community for selecting channel quality best in cell is switched to the Target cell by the serving cell as Target cell, and by the terminal, and first threshold value is greater than second threshold value;If movement speed of the terminal at the moment is less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, the neighboring community for selecting channel quality best from the neighboring community of prediction is switched to the Target cell by the serving cell as Target cell, and by the terminal.

With reference to first aspect, the third possible implementation of the possible implementation of the first of first aspect, second of possible implementation of first aspect or first aspect, in the 9th kind of possible implementation, the size of the monitoring cycle is the handover delay size of the terminal, wherein, the handover delay size refers to the time completed from handover trigger to switching.

Second aspect, a kind of terminal, the terminal include:

Prediction module, for when reaching at the currently monitored moment, prediction currently to provide the serving cell of service and at least one neighboring community of the serving cell at next monitoring moment for terminal+1Channel quality, wherein tM=ti+T, for the monitoring cycle of setting ,=0,1,2 ...;

Processing module, for executing the cell switch process of the terminal according to the channel quality of the serving cell predicted and the channel quality of at least one neighboring community described in predicting.

In conjunction with second aspect, in the first possible implementation, the processing module is specifically used for: when threshold value of the channel quality for the serving cell that the prediction module predicts lower than setting, the neighboring community each of is predicted in the channel quality at moment according to the prediction module, it selects a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell.

In conjunction with second aspect, in the second possible implementation, initial monitor moment ^) it is at the time of setting at random, alternatively, at the time of to meet the trigger condition of setting.

In conjunction with second of possible implementation of second aspect, in the third possible implementation, the trigger condition includes threshold value of the signal quality lower than setting of the current serving cell of terminal.

In conjunction with the third possible implementation of the first possible implementation of second aspect, second aspect, second of possible implementation of second aspect or second aspect, in the 4th kind of possible reality In existing mode, the prediction module is specifically used for:

According to Gauss-Markov mobility model, predict the serving cell and the neighboring community+1The channel quality at moment.

In conjunction with the 4th kind of possible implementation of second aspect, in a fifth possible implementation, the prediction module is specifically used for:

The terminal is obtained in the location information at moment, the location information includes movement speed and moving direction of the terminal at the moment;

Location information according to the terminal at the moment predicts that the terminal exists+1The location information at moment;And

According to the location information that prediction obtains, predict the serving cell and the neighboring community in the channel quality at t moment.

In conjunction with the 5th kind of possible implementation of second aspect, in a sixth possible implementation, the prediction module is specifically used for:

According to the location information that prediction obtains, the range information of base station belonging to the terminal to the serving cell and the neighboring community is determined respectively;

It predicts the serving cell using the path loss algorithm of shadow fading according to the range information of base station belonging to the terminal to the serving cell determined and exists+1The channel quality at moment;And the range information of the base station according to belonging to the terminal to the neighboring community determined predicts the neighboring community in t using the path loss algorithm of shadow fadingMThe channel quality at moment.

In conjunction with the first possible implementation of second aspect, in the 7th kind of possible implementation, the processing module is specifically used for: being existed according to the terminal in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted+1The channel quality at moment executes the cell switch process of the terminal. In conjunction with the 7th kind of possible implementation of second aspect, in the 8th kind of possible implementation, the processing module is specifically used for:

If the macrocell in the first threshold value and the neighboring community that movement speed of the terminal at the moment is greater than setting is in tMThe macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell not less than the threshold value of setting by the channel quality at moment;Or

If the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, and the macrocell in the neighboring community is in tMThe macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value not less than the threshold value of setting by the channel quality at moment;Or

If movement speed of the terminal at the moment no more than the first threshold value set and is not less than the second threshold value set, and the currently transmitted business of the terminal is non-real-time service, the neighboring community for selecting channel quality best from the neighboring community of prediction is as Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value;If movement speed of the terminal at the moment is less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, the neighboring community for selecting channel quality best from the neighboring community of prediction is switched to the Target cell by the serving cell as Target cell, and by the terminal.

In conjunction with the third possible implementation of the first possible implementation of second aspect, second aspect, second of possible implementation of second aspect or second aspect, in the 9th kind of possible implementation, the size of the monitoring cycle is the handover delay size of the terminal, wherein, the handover delay size refers to the time completed from handover trigger to switching.

The third aspect, a kind of terminal, the terminal include:

Transceiver, for being communicated with other equipment;

Processor, for when reaching at the currently monitored moment, prediction currently to provide the service of service for terminal At least one neighboring community of cell and the serving cell is in next monitoring moment tMChannel quality, wherein t=ti+T, for the monitoring cycle of setting ,=ο, ι,2,···;The channel quality of at least one neighboring community described according to the channel quality of the serving cell predicted and predicting, executes the cell switch process of the terminal.

In conjunction with the third aspect, in the first possible implementation, processor is specifically used for: when threshold value of the channel quality of the serving cell predicted lower than setting, existing according to the neighboring community each of is predicted+1The channel quality at moment selects a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell.

In conjunction with the third aspect, in the second possible implementation, the initial monitor moment.At the time of to set at random, alternatively, at the time of to meet the trigger condition of setting.

In conjunction with second of possible implementation of the third aspect, in the third possible implementation, the trigger condition includes threshold value of the signal quality lower than setting of the current serving cell of terminal.

In conjunction with the third possible implementation of the first possible implementation of the third aspect, the third aspect, second of possible implementation of the third aspect or the third aspect, in the fourth possible implementation, processor is specifically used for:

According to Gauss-Markov mobility model, predict the serving cell and the neighboring community+1The channel quality at moment.

In conjunction with the 4th kind of possible implementation of the third aspect, in a fifth possible implementation, processor is specifically used for:

The terminal is obtained in the location information at ti moment, the location information includes movement speed and moving direction of the terminal at the ti moment;

Location information according to the terminal at the moment predicts the terminal in the location information at d moment;And

According to the location information that prediction obtains, predict that the serving cell and the neighboring community exist+1When The channel quality at quarter.

In conjunction with the 5th kind of possible implementation of the third aspect, in a sixth possible implementation, processor is specifically used for:

According to the location information that prediction obtains, the range information of base station belonging to the terminal to the serving cell and the neighboring community is determined respectively;

It predicts the serving cell using the path loss algorithm of shadow fading according to the range information of base station belonging to the terminal to the serving cell determined and exists+1The channel quality at moment;And the range information of the base station according to belonging to the terminal to the neighboring community determined predicts the neighboring community in t using the path loss algorithm of shadow fadingMThe channel quality at moment.

In conjunction with the first possible implementation of the third aspect, in the 7th kind of possible implementation, processor is specifically used for:

Existed according to the terminal in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted+1The channel quality at moment executes the cell switch process of the terminal.

In conjunction with the 7th kind of possible implementation of the third aspect, in the 8th kind of possible implementation, processor is specifically used for:

If the macrocell in the first threshold value and the neighboring community that movement speed of the terminal at the moment is greater than setting is in tMThe macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell not less than the threshold value of setting by the channel quality at moment;Or

If the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, and the macrocell in the neighboring community is in tMThe macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value not less than the threshold value of setting by the channel quality at moment;Or If movement speed of the terminal at the moment no more than the first threshold value set and is not less than the second threshold value set, and the currently transmitted business of the terminal is non-real-time service, the neighboring community for selecting channel quality best from the neighboring community of prediction is as Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value;If movement speed of the terminal at the moment is less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, the neighboring community for selecting channel quality best from the neighboring community of prediction is switched to the Target cell by the serving cell as Target cell, and by the terminal.

In conjunction with the third possible implementation of the first possible implementation of the third aspect, the third aspect, second of possible implementation of the third aspect or the third aspect, in the 9th kind of possible implementation, the size of the monitoring cycle is the handover delay size of the terminal, wherein, the handover delay size refers to the time completed from handover trigger to switching.

Method and apparatus provided in an embodiment of the present invention, when reaching at the currently monitored moment, prediction currently provides the serving cell of service and at least one neighboring community of the serving cell in next monitoring moment t for the terminalMChannel quality;And according to the channel quality of the serving cell predicted and the channel quality of at least one neighboring community predicted, the cell switch process of terminal is executed.Due to predicting the channel quality of the serving cell of subsequent time terminal, make the terminal that can carry out switching before serving cell channel declines to and can not transmit data packet to prepare, under the premise of guaranteeing data packet normal transmission, maximally utilise the channel resource of serving cell, realizes seamless switching.Detailed description of the invention

Fig. 1 is a kind of schematic diagram of the network-control switching of terminal auxiliary;

Fig. 2 is a kind of flow diagram of cell switching method provided by the invention;

Fig. 3 is the flow diagram of embodiment one provided by the invention;

Fig. 4 is the schematic diagram of the first terminal provided by the invention;

Fig. 5 is the schematic diagram of second of terminal provided by the invention. Specific embodiment

The channel quality that the embodiment of the present invention passes through the serving cell of prediction subsequent time terminal, make the terminal that can carry out switching before serving cell channel declines to and can not transmit data packet to prepare, under the premise of guaranteeing data packet normal transmission, maximally utilise the channel resource of serving cell, realizes seamless switching.

The embodiment of the present invention is suitable for GSM (Global System for Mobile communication, global system for mobile communications), CDMA (the Time Division- Synchronous Code Division Multiple Access of time division synchronous, TD-SCDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA), CDMA2000, long term evolution (Long Term Evolution, LTE), long term evolution Enhance communication systems such as (LTE- Advanced, LTE-A).

By taking lte-a system as an example, base station is the node B (eNode B, eNB) of evolution, and the network interface between base station and terminal is Uu interface, network interface between base station and base station is X2 interface, and the interface between base station and core net is S1 interface.Realize and cover to the wireless signal of specific region that these specific regions are referred to as cell using single antenna or multiple antennas in base station.Cell provides service for the user terminal in this particular coverage.

The embodiment of the present invention is described in further detail with reference to the accompanying drawings of the specification.It should be appreciated that embodiment described herein is only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.

A kind of cell switching method provided in an embodiment of the present invention, it is shown in Figure 2, this method comprises: step 21, when reaching at the currently monitored moment, prediction is current to provide the serving cell of service and at least one neighboring community of the serving cell in next monitoring moment t for terminalMChannel quality.In this step, ti+1=ti+T, for the monitoring cycle of setting, ζ=0,1,2,.

In this step, since the value size of monitoring cycle Τ influences whether the performance of network, and then the Quality of experience of user is influenced.Monitoring cycle is smaller, although prediction result is accurate, will cause the frequent switching of terminal, and monitoring cycle is too small also results in computationally intensive, waste of resource;Monitoring cycle is bigger, and prediction result will be more inaccurate, and will lead to when the signal quality of serving cell has been unable to maintain that data normal transmission, and there are no access Target cells, increases the risk of handover failure;Therefore, in order to maximally utilise the Internet resources of current service cell under the premise of guaranteeing not lost data packets, preferably, The size of monitoring cycle is the handover delay size of the terminal, wherein the handover delay size refers to the time completed from handover trigger to switching.Prediction result is the signal quality that terminal completes serving cell and Target cell after switching in this way.

Specifically, the size of handover delay t and current handover measurement time Tmeasure, network switching time length TreadyAnd target network link turn-on time length TaccessThe channel quality for the serving cell that correlation, i.e. step 22, basis predict and the channel quality of at least one neighboring community predicted, execute the cell switch process of terminal.

In the embodiment of the present invention, in the currently monitored moment ttWhen arrival, prediction currently provides the serving cell of service and at least one neighboring community of the serving cell at next monitoring moment for the terminal+1Channel quality;And according to the channel quality of the serving cell predicted and the channel quality of at least one neighboring community predicted, the cell switch process of terminal is executed.Due to predicting the channel quality of the serving cell of subsequent time terminal, make the terminal that can carry out switching before serving cell channel declines to and can not transmit data packet to prepare, under the premise of guaranteeing data packet normal transmission, maximally utilise the channel resource of serving cell, realizes seamless switching.

In the embodiment of the present invention, the channel quality of the current serving cell of prediction terminal decides whether to switch, when the channel quality of the serving cell predicted is less than threshold value (i.e. the switching preset value) of setting, it will prepare from the moment for cell switching, guarantee before link quality deteriorates, cell switching is completed, guarantees the continuity of data transmission.And predict that the channel quality of the neighboring community of the serving cell determines the Target cell that terminal is switched to, and can choose the best cell of channel quality as Target cell.

Preferably, the executing subject of above-mentioned steps is terminal.

In the embodiment of the present invention, (which is suitable for serving cell and its neighboring community as co-frequency cell at the time of the initial monitor moment can be to set at random, the setting when terminal establishes connection), the ^) or meet set trigger condition at the time of (which be suitable for serving cell quality lower than sets thresholding and monitor neighboring community as alien-frequency district). Preferably, the trigger condition of setting includes but is not limited to the following conditions: threshold value of the signal quality of the current serving cell of terminal lower than setting.

In an implementation, step 22 specifically includes: when threshold value of the channel quality of the serving cell predicted lower than setting, being existed according to each neighboring community predicted+1The channel quality at moment selects a neighboring community as Target cell, and terminal is switched to the Target cell by current serving cell.

Specifically, when the serving cell for predicting the terminal exists+1When the channel quality at moment is lower than the threshold value set, i.e. the serving cell of the terminal exists+1The channel quality at moment is deteriorated, and can switch the terminal into the cell that channel quality is good.

In an implementation, in step 21, at least one neighboring community of prediction terminal current serving cell and the serving cell exists+1The channel quality at moment, comprising:

According to Gauss-Markov mobility model, at least one neighboring community of the serving cell and the serving cell is predicted in tMThe channel quality at moment.

Further, according to Gauss-Markov mobility model, at least one neighboring community of serving cell and the serving cell is predicted in ti+lThe channel quality at moment, comprising: obtain terminal in ttThe location information at moment, the location information include terminal in ttThe movement speed and moving direction at moment;

Location information according to terminal at the moment predicts that the terminal exists+1The location information at moment;And according to the obtained location information of prediction, predict at least one neighboring community of the current serving cell of the terminal and the serving cell in tMThe channel quality at moment.

Specifically, the working principle of Gauss-Markov mobility model is that the movement rate of mobile node (such as terminal) is regarded as to time upper relevant Gauss-Markov process, carve at the beginning is that each mobile node designs a speed and direction, after time interval T by setting, each mobile node updates current speed and direction, it is considered that the speed of the mobile node and direction are constant, to go out speed and the direction of later moment in time by the speed and direction prediction of previous moment in each time interval. For example, after the terminal is linked into serving cell, due to user's initial time be it is static, define initial velocity ^=0, set macro base station as coordinate origin, initial position is (A, Y0), the channel quality of current time serving cell is obtained, and the data of these measurements are stored into location database, is updated periodically information.Then according to location information current in location database, the movement speed and moving direction θ of the subsequent time terminal are predicted using one Markov mobility model of Gaussη, under specific formula:

Vn= *Vn_1+(\-a)*V + (l-«2) * ^ ... formula 1; θη= *θη_λ+{\-α)*θ+ (l-a2) * θΧηFormula 2;

Wherein, " for characterizing mobile randomness, and 0≤, "≤1, ultimately, when " is linear uniform motion when=0, when " being Brownian movement when=1;With the mean value for indicating speed and direction at that time; ― ^.^ is the stochastic variable in the Gaussian Profile that mean value is 0.

The position coordinates () of subsequent time terminal can be obtained by following formula:

... formula 3;

... formula 4;

Wherein, Τ is the monitoring cycle of setting.

It should be noted that in above-mentioned formula 1 and formula 2, " value be to be configured according to the needs of the actual motion scene of terminal, connected each other due to moving under normal conditions, so " value range be 0 < α < 1 ,-as can be set to 0.75. VnIt is according to initial velocity V.It obtains, and initial time mobile subscriber is generally stationary state, so V can be defined.=0, so as to obtain V according to formula recursionn.And { VxnIt is the Gaussian Profile for meeting mean value and being 0, it may select from a random number.

Based on any of the above-described embodiment, in an implementation, according to the location information that prediction obtains, at least one neighboring community of prediction terminal current serving cell and the serving cell exists+1The channel quality at moment, comprising:

According to the location information that prediction obtains, the range information of base station belonging to terminal at least one of serving cell and the serving cell neighboring community is determined respectively;And

According to the range information of base station belonging to the terminal to serving cell determined, using shadow fading Path loss algorithm, predict the serving cell and exist+1The channel quality at moment;And/or the range information of the base station according to belonging at least one neighboring community of the terminal determined to the serving cell predicts at least one neighboring community in t using the path loss algorithm of shadow fadingMThe channel quality at moment.

For example, to predict that serving cell exists+1For the channel quality at moment, terminal according to predict from+1The location information at moment determines that itself arrives the distance (i.e. the distance of base station belonging to the terminal to serving cell) of serving cell, according to the path loss model of shadow fading, can be obtained+1The signal strength of moment serving cell.

RSS= PTx - PLrf- 10 * β * ^ -/(, σ) ... ... formula5

"ref

Wherein, ΡΤχIt is the transmission power of base station,!^ is the path loss of the reference point of setting, and it is path loss index that ^, which is distance of the reference point to base station, value in urban environment is usually 2 dB ~ 4dB, be distance of the terminal current location to base station, represent shadow fading, generally mean value be 0, variance σ2Gaussian Profile.Wherein, the path loss of reference point and the distance of reference point to base station are known.

It is also possible to calculate the interference strength of neighboring community's (cell i.e. in addition to the serving cell of the terminal) using above-mentioned formula 5, the ratio of the two measurement parameters is exactly+1The channel quality of moment serving cell.

Based on any of the above-described embodiment, preferably, measurement parameter for measuring cell (serving cell including terminal and the cell in addition to the serving cell) channel quality can be Reference Signal Received Quality (Reference Signal Received Quality, RSRQ), i.e. the ratio between signal strength and interference strength.When the RSRQ value of the current serving cell of the terminal of prediction is less than preset handoff threshold value (RSRQThr) when, then it is assumed that the terminal currently meets cell switching condition, otherwise, continues the channel quality for periodically monitoring itself current serving cell, updates location database information.

Certainly, the embodiment of the present invention is not limited to measure the cell (serving cell including terminal using RSRQ And the cell in addition to the serving cell) channel quality, cell channel quality can also be measured using other parameters, such as Reference Signal Received Power (Reference Signal Received Power, RSRP).

Based on any of the above-described embodiment, in step 22, existed according to each neighboring community predicted+1The channel quality at moment selects a neighboring community to be switched to Target cell by serving cell as Target cell, and by terminal, comprising:

Existed according to terminal in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted+1The channel quality at moment executes the cell switch process of the terminal.

Specifically, not only considering the channel quality of each neighboring community, it is also contemplated that the terminal is in current time (the currently transmitted type of service of movement speed and/or the terminal i.e. when executing the cell switch process of the terminal.Wherein, the speed mobile according to terminal can be divided into high-speed mobile, middling speed movement and low mobility state, mainly be divided according to preset speed threshold value;Type of service is divided into real time business (such as voice communication, Video chat) and non-real-time service (such as short message service).

Further, existed according to terminal in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted+1The channel quality at moment executes the cell switch process of the terminal, including the preferred implementation of following four:

If the macrocell (Macrocell) in the first threshold value and neighboring community that the movement speed of mode 1, terminal at the moment is greater than setting exists+1Macrocell is then chosen to be Target cell, and the terminal is switched to selected Target cell by current serving cell not less than the threshold value of setting by the channel quality at moment.

Under which, it is only necessary to which macro base station is found by the base station of serving cell in base station belonging to the serving cell for notifying itself current, and the terminal is guided to be switched under corresponding macrocell (Macrocell), to ensure that the continuity of communication.

Under which, if macrocell exists+1The channel quality at moment exists lower than the threshold value set, i.e. macrocell+1The channel quality at moment is also bad, then terminal carries out cell switching using existing way, that is, enters cell level pre-switch mode, and switch selection algorithm according to preset cell, (should from cell candidates list List include the predictably terminal imagination meet channel quality not less than setting threshold value neighboring community) in select channel quality best neighboring community as Target cell, and the result of decision is advertised to base station belonging to itself current serving cell, specifically information exchange and Coordination Treatment can be carried out by the serving cell and Target cell of the terminal, guiding terminal is switched to Target cell, realize seamless switching, i.e. using the cell switching mode of " network-control, terminal auxiliary ".

If mode 2, terminal are in ttThe movement speed at moment is no more than the first threshold value set and not less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, and channel quality of the macrocell in neighboring community at the moment is not less than the threshold value of setting, macrocell is then chosen to be Target cell, and the terminal is switched to selected Target cell by current serving cell, wherein, the first threshold value is greater than the second threshold value.

If mode 3, terminal are in ttThe movement speed at moment is no more than the first threshold value set and not less than the second threshold value of setting, and the currently transmitted business of the terminal is non-real-time service, the neighboring community for then selecting channel quality best from the neighboring community of prediction is as Target cell, and the terminal is switched to selected Target cell by current serving cell, wherein, the first threshold value is greater than the second threshold value.

Under which, terminal realizes seamless switching, referring specifically to the description in aforesaid way 1 using the cell switching mode of " network-control, terminal auxiliary ".

If the movement speed of mode 4, terminal at the moment is less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, the neighboring community for then selecting channel quality best from the neighboring community of prediction is switched to selected Target cell by current serving cell as Target cell, and by the terminal.

Under which, terminal realizes seamless switching, referring specifically to the description in aforesaid way 1 using the cell switching mode of " network-control, terminal auxiliary ".

Below with reference to following specific embodiments, handoff procedure provided by the invention is described in detail.Embodiment one, shown in Figure 3, cell switch process includes: in the present embodiment

Step 301, the movement speed of periodically monitoring user's current time (i.e.) and position; Step 302, prediction user are in subsequent time (speed and position i.e.;

Step 303 calculates channel quality of the user in subsequent time, the channel quality of channel quality and neighboring community including the current serving cell of user;

Step 304 judges whether user meets cell switching condition;

If so, thening follow the steps 305;

If it is not, then return step 301;

Step 305 judges whether user is in high-speed mobile;

If so, thening follow the steps 306;

If it is not, thening follow the steps 307;

Step 306, the macrocell being directly switch under macro base station;

Step 307 judges whether user is in middling speed movement;

If so, thening follow the steps 308;

If it is not, thening follow the steps 309;

Whether step 308, the business for judging user's current transmission are real time business;

If so, thening follow the steps 306;

If it is not, thening follow the steps 310;

Step 310, selection best target cell execute switching, i.e., existing cell switch process.

Above method process flow can realize that the software program can store in storage medium with software program, when the software program of storage is called, execute above method step.

Based on the same inventive concept, the embodiment of the invention also provides a kind of terminals, and shown referring to fig. 4, which includes:

Prediction module 41, in the currently monitored moment ttWhen arrival, prediction is current to provide the serving cell of service and at least one neighboring community of the serving cell at next monitoring moment for terminal+1Channel quality, wherein tM=ti+T, for the monitoring cycle of setting ,=0,1,2 ...;

Processing module 42, for executing the cell switch process of the terminal according to the channel quality of the serving cell predicted and the channel quality of at least one neighboring community described in predicting. Terminal provided in an embodiment of the present invention, when reaching at the currently monitored moment, prediction currently provides the serving cell of service and at least one neighboring community of the serving cell in next monitoring moment t for the terminali+lChannel quality;And according to the channel quality of the serving cell predicted and the channel quality of at least one neighboring community predicted, the cell switch process of terminal is executed.Due to predicting the channel quality of the serving cell of subsequent time terminal, make the terminal that can carry out switching before serving cell channel declines to and can not transmit data packet to prepare, under the premise of guaranteeing data packet normal transmission, maximally utilise the channel resource of serving cell, realizes seamless switching.

In order to maximally utilise the Internet resources of current service cell under the premise of guaranteeing not lost data packets, preferably, the size of monitoring cycle is the handover delay size of the terminal, wherein the handover delay size refers to the time completed from handover trigger to switching.Prediction result is the signal quality that terminal completes serving cell and Target cell after switching in this way.

Specifically, the size of handover delay t and current handover measurement time Tmeasure, network switching time length TreadyAnd target network link turn-on time length TaccessIt is related, i.e. in the embodiment of the present invention, prediction module 41 predicts that the channel quality of the current serving cell of terminal decides whether to switch, when the channel quality of the serving cell predicted is less than threshold value (i.e. the switching preset value) of setting, it will prepare from the moment for cell switching, guarantee before link quality deteriorates, completes cell switching, guarantee the continuity of data transmission.And prediction module 41 predicts that the channel quality of the neighboring community of the serving cell determines the Target cell that terminal is switched to, and can choose the best cell of channel quality as Target cell.

In the embodiment of the present invention, (which is suitable for serving cell and its neighboring community as co-frequency cell at the time of the initial monitor moment can be to set at random, the setting when terminal establishes connection), the ^) or meet set trigger condition at the time of (which be suitable for serving cell quality lower than sets thresholding and monitor neighboring community as alien-frequency district).

Preferably, the trigger condition of setting includes but is not limited to the following conditions: the current serving cell of terminal Signal quality lower than setting threshold value.

In an implementation, processing module 42 is specifically used for:

When threshold value of the channel quality for the serving cell that prediction module 41 predicts lower than setting, the neighboring community each of is predicted according to prediction module 41 and is existed+1The channel quality at moment selects a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell.

Specifically, when the serving cell that prediction module 41 predicts the terminal exists+1When the channel quality at moment is lower than the threshold value set, i.e. the serving cell of the terminal exists+1The channel quality at moment is deteriorated, and can switch the terminal into the cell that channel quality is good.

Based on any of the above-described embodiment, in an implementation, prediction module 41 is specifically used for:

According to Gauss-Markov mobility model, predict the serving cell and the neighboring community+1The channel quality at moment.

Further, prediction module 41 predicts the serving cell and the neighboring community in t according to Gauss-Markov mobility modeli+1The channel quality at moment, comprising: obtain the terminal in ttThe location information at moment, the location information include the terminal in ttThe movement speed and moving direction at moment;

Location information according to the terminal at the moment predicts that the terminal exists+1The location information at moment;And

According to the location information that prediction obtains, predict the serving cell and the neighboring community in the channel quality at moment.

Specifically, the working principle of Gauss-Markov mobility model is that the movement rate of mobile node (such as terminal) is regarded as to time upper relevant Gauss-Markov process, carve at the beginning is that each mobile node designs a speed and direction, after time interval T by setting, each mobile node updates current speed and direction, it is considered that the speed of the mobile node and direction are constant, to go out speed and the direction of later moment in time by the speed and direction prediction of previous moment in each time interval. Based on any of the above-described embodiment, in an implementation, the location information that prediction module 41 is obtained according to prediction predicts that the serving cell and the neighboring community exist+1The channel quality at moment, comprising:

According to the location information that prediction obtains, the range information of base station belonging to the terminal to the serving cell and the neighboring community is determined respectively;

It predicts the serving cell using the path loss algorithm of shadow fading according to the range information of base station belonging to the terminal to the serving cell determined and exists+1The channel quality at moment;And the range information of the base station according to belonging to the terminal to the neighboring community determined predicts the neighboring community in t using the path loss algorithm of shadow fadingi+1The channel quality at moment.

Based on any of the above-described embodiment, preferably, measurement parameter for measuring cell (serving cell including terminal and the cell in addition to the serving cell) channel quality can be Reference Signal Received Quality (Reference Signal Received Quality, RSRQ), i.e. the ratio between signal strength and interference strength.When the RSRQ value of the current serving cell of the terminal of prediction is less than preset handoff threshold value (RSRQThr) when, then it is assumed that the terminal currently meets cell switching condition, otherwise, continues the channel quality for periodically monitoring itself current serving cell, updates location database information.

Certainly, the embodiment of the present invention is not limited to measure cell (serving cell including terminal and the cell in addition to the serving cell) channel quality using RSRQ, cell channel quality can also be measured using other parameters, such as Reference Signal Received Power (Reference Signal Received Power, RSRP).

Based on any of the above-described embodiment, in an implementation, processing module 42 is specifically used for:

Existed according to the terminal in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted+1The channel quality at moment executes the cell switch process of the terminal.

Specifically, not only considering the channel quality of each neighboring community, it is also contemplated that the terminal is in current time (the currently transmitted type of service of movement speed and/or the terminal i.e. when executing the cell switch process of the terminal.Wherein, the speed mobile according to terminal can be divided into high-speed mobile, middling speed movement and low mobility state, mainly be divided according to preset speed threshold value;Type of service is divided into real time Business (such as voice communication, Video chat) and non-real-time service (such as short message service).

Further, processing module 42 is according to terminal in ttThe movement speed at moment and/or the currently transmitted type of service of the terminal and each neighboring community predicted exist+1The channel quality at moment executes the cell switch process of the terminal, including the preferred implementation of following four:

If the macrocell in the first threshold value and the neighboring community that the movement speed of mode one, the terminal at the moment is greater than setting is in ti+1The macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell not less than the threshold value of setting by the channel quality at moment.Referring specifically to the description of aforesaid way 1, details are not described herein again.

If mode two, the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, and the macrocell in the neighboring community is in ti+1The macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value not less than the threshold value of setting by the channel quality at moment.Referring specifically to the description of aforesaid way 2, details are not described herein again.

If mode three, the terminal are in ttThe movement speed at moment is no more than the first threshold value set and not less than the second threshold value of setting, and the currently transmitted business of the terminal is non-real-time service, the neighboring community for selecting channel quality best from the neighboring community of prediction is as Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value.Referring specifically to the description of aforesaid way 3, details are not described herein again.

If the movement speed of mode four, the terminal at the moment is less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, the neighboring community for selecting channel quality best from the neighboring community of prediction is switched to the Target cell by the serving cell as Target cell, and by the terminal.Referring specifically to the description of aforesaid way 4, details are not described herein again.

Based on the same inventive concept, the present invention also provides another terminal, join as shown in Figure 5, the end End includes:

Transceiver 51, for being communicated with other equipment;

Processor 52, for when reaching at the currently monitored moment, prediction currently to provide the serving cell of service and at least one neighboring community of the serving cell at next monitoring moment for terminal+1Channel quality, wherein t=ti+T, for the monitoring cycle of setting ,=0,1,2,;The channel quality of at least one neighboring community described according to the channel quality of the serving cell predicted and predicting, executes the cell switch process of the terminal.

Terminal provided in an embodiment of the present invention, when reaching at the currently monitored moment, prediction currently provides the serving cell of service and at least one neighboring community of the serving cell in next monitoring moment t for the terminali+lChannel quality;And according to the channel quality of the serving cell predicted and the channel quality of at least one neighboring community predicted, the cell switch process of terminal is executed.Due to predicting the channel quality of the serving cell of subsequent time terminal, make the terminal that can carry out switching before serving cell channel declines to and can not transmit data packet to prepare, under the premise of guaranteeing data packet normal transmission, maximally utilise the channel resource of serving cell, realizes seamless switching.

In order to maximally utilise the Internet resources of current service cell under the premise of guaranteeing not lost data packets, preferably, the size of monitoring cycle is the handover delay size of the terminal, wherein the handover delay size refers to the time completed from handover trigger to switching.Prediction result is the signal quality that terminal completes serving cell and Target cell after switching in this way.

Specifically, the size of handover delay t and current handover measurement time Tmeasure, network switching time length TreadyAnd target network link turn-on time length TaccessIt is related, i.e. in the embodiment of the present invention, processor 52 predicts that the channel quality of the current serving cell of terminal decides whether to switch, when the channel quality of the serving cell predicted is less than threshold value (i.e. the switching preset value) of setting, it will prepare from the moment for cell switching, guarantee before link quality deteriorates, completes cell switching, guarantee the continuity of data transmission.And processor 52 predicts the serving cell The channel quality of neighboring community determine the Target cell that is switched to of terminal, can choose the best cell of channel quality as Target cell.

In the embodiment of the present invention, (which is suitable for serving cell and its neighboring community as co-frequency cell at the time of the initial monitor moment can be to set at random, the setting when terminal establishes connection), the ^) or meet set trigger condition at the time of (which be suitable for serving cell quality lower than sets thresholding and monitor neighboring community as alien-frequency district).

Preferably, the trigger condition of setting includes but is not limited to the following conditions: threshold value of the signal quality of the current serving cell of terminal lower than setting.

In an implementation, processor 52 is specifically used for:

When threshold value of the channel quality of the serving cell predicted lower than setting, exist according to the neighboring community each of is predicted+1The channel quality at moment selects a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell.

Specifically, when the serving cell for predicting the terminal exists+1When the channel quality at moment is lower than the threshold value set, i.e. the serving cell of the terminal exists+1The channel quality at moment is deteriorated, and can switch the terminal into the cell that channel quality is good.

Based on any of the above-described embodiment, in an implementation, processor 52 is specifically used for:

According to Gauss-Markov mobility model, predict the serving cell and the neighboring community+1The channel quality at moment.

Further, processor 52 predicts the serving cell and the neighboring community exists according to Gauss-Markov mobility model+1The channel quality at moment, comprising: obtain the terminal in ttThe location information at moment, the location information include the terminal in ttThe movement speed and moving direction at moment;

Location information according to the terminal at the moment predicts that the terminal exists+1The location information at moment;And According to the location information that prediction obtains, predict the serving cell and the neighboring community in the channel quality at t moment.

Based on any of the above-described embodiment, in an implementation, the location information that processor 52 is obtained according to prediction predicts that the serving cell and the neighboring community exist+1The channel quality at moment, comprising:

According to the location information that prediction obtains, the range information of base station belonging to the terminal to the serving cell and the neighboring community is determined respectively;

It predicts the serving cell using the path loss algorithm of shadow fading according to the range information of base station belonging to the terminal to the serving cell determined and exists+1The channel quality at moment;And the range information of the base station according to belonging to the terminal to the neighboring community determined predicts the neighboring community in t using the path loss algorithm of shadow fadingi+1The channel quality at moment.

Based on any of the above-described embodiment, preferably, the measurement parameter for measuring cell (serving cell including terminal and the cell in addition to the serving cell) channel quality can be RSRQ, i.e. the ratio between signal strength and interference strength.When the RSRQ value of the current serving cell of the terminal of prediction is less than preset handoff threshold value (R^RO), then think that the terminal currently meets cell switching condition, otherwise, continue the channel quality for periodically monitoring itself current serving cell, update location database information.

Certainly, the embodiment of the present invention is not limited to measure cell (serving cell including terminal and the cell in addition to the serving cell) channel quality using RSRQ, can also measure cell channel quality, such as RSRP using other parameters.

Based on any of the above-described embodiment, in an implementation, processor 52 is specifically used for:

Existed according to the terminal in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted+1The channel quality at moment executes the cell switch process of the terminal.

Specifically, processor 52 not only considers the channel quality of each neighboring community, it is also contemplated that the terminal is in current time (the currently transmitted type of service of movement speed and/or the terminal i.e. when executing the cell switch process of the terminal.Wherein, the speed mobile according to terminal, can be divided into high-speed mobile, Middling speed movement and low mobility state, mainly divide according to preset speed threshold value;Type of service is divided into real time business (such as voice communication, Video chat) and non-real-time service (such as short message service).

Further, processor 52 is according to terminal in ttThe movement speed at moment and/or the currently transmitted type of service of the terminal and each neighboring community predicted exist+1The channel quality at moment executes the cell switch process of the terminal, including the preferred implementation of following four:

If the macrocell in the first threshold value and the neighboring community that the movement speed of mode one, the terminal at the moment is greater than setting is in ti+1The macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell not less than the threshold value of setting by the channel quality at moment.Referring specifically to the description of aforesaid way 1, details are not described herein again.

If mode two, the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, and the macrocell in the neighboring community is in ti+1The macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value not less than the threshold value of setting by the channel quality at moment.Referring specifically to the description of aforesaid way 2, details are not described herein again.

If mode three, the terminal are in ttThe movement speed at moment is no more than the first threshold value set and not less than the second threshold value of setting, and the currently transmitted business of the terminal is non-real-time service, the neighboring community for selecting channel quality best from the neighboring community of prediction is as Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value.Referring specifically to the description of aforesaid way 3, details are not described herein again.

If the movement speed of mode four, the terminal at the moment is less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, the neighboring community for selecting channel quality best from the neighboring community of prediction is switched to the Target cell by the serving cell as Target cell, and by the terminal.Referring specifically to the description of aforesaid way 4, details are not described herein again. It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program product.Therefore, the form of complete hardware embodiment, complete software embodiment or embodiment combining software and hardware aspects can be used in the present invention.Moreover, the form for the computer program product implemented in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) that one or more wherein includes computer usable program code can be used in the present invention.

The present invention be referring to according to the method for the embodiment of the present invention, the flowchart and/or the block diagram of equipment (system) and computer program product describes.It should be understood that the combination of process and/or box in each flow and/or block and flowchart and/or the block diagram that can be realized by computer program instructions in flowchart and/or the block diagram.These computer program instructions be can provide to the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to generate a machine, so that generating by the instruction that computer or the processor of other programmable data processing devices execute for realizing the device for the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions, which may also be stored in, to be able to guide in computer or other programmable data processing devices computer-readable memory operate in a specific manner, so that instruction stored in the computer readable memory generates the manufacture including command device, which realizes the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that series of operation steps are executed on a computer or other programmable device to generate computer implemented processing, thus the step of instruction executed on a computer or other programmable device is provided for realizing the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram.

Although preferred embodiments of the present invention have been described, once a person skilled in the art knows basic creative concepts, then additional changes and modifications may be made to these embodiments.So it includes preferred embodiment and all change and modification for falling into the scope of the invention that the following claims are intended to be interpreted as.The spirit and scope of invention.If being wanted in this way, these modifications and changes of the present invention belongs to right of the present invention Ask and its equivalent technologies within the scope of, then the present invention is also intended to include these modifications and variations.

Claims (1)

  1. Claim
    1, a kind of terminal, which is characterized in that the terminal includes:
    Prediction module, for when reaching at the currently monitored moment, prediction currently to provide the serving cell of service and at least one neighboring community of the serving cell at next monitoring moment for terminal+1Channel quality, wherein tM=ti+T, for the monitoring cycle of setting ,=0,1,2 ...;
    Processing module, for executing the cell switch process of the terminal according to the channel quality of the serving cell predicted and the channel quality of at least one neighboring community described in predicting.
    2, terminal as described in claim 1, it is characterized in that, the processing module is specifically used for: when threshold value of the channel quality for the serving cell that the prediction module predicts lower than setting, the neighboring community each of is predicted in the channel quality at moment according to the prediction module, it selects a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell.
    3, terminal as described in claim 1, which is characterized in that initial monitor moment ^) it is at the time of setting at random, alternatively, at the time of to meet the trigger condition of setting.
    4, terminal as claimed in claim 3, which is characterized in that the trigger condition includes threshold value of the signal quality lower than setting of the current serving cell of terminal.
    5, the described in any item terminals of such as claim 1 ~ 4, which is characterized in that the prediction module is specifically used for:
    According to Gauss-Markov mobility model, predict the serving cell and the neighboring community+1The channel quality at moment.
    6, terminal as claimed in claim 5, which is characterized in that the prediction module is specifically used for: the terminal is obtained in ttThe location information at moment, the location information include the terminal in ttThe movement speed and moving direction at moment;
    Location information according to the terminal at the moment predicts that the terminal exists+1The location information at moment;And According to the location information that prediction obtains, predict the serving cell and the neighboring community in the channel quality at t moment.
    7, terminal as claimed in claim 6, which is characterized in that the prediction module is specifically used for: the location information obtained according to prediction determines the range information of base station belonging to the terminal to the serving cell and the neighboring community respectively;
    It predicts the serving cell using the path loss algorithm of shadow fading according to the range information of base station belonging to the terminal to the serving cell determined and exists+1The channel quality at moment;And the range information of the base station according to belonging to the terminal to the neighboring community determined predicts the neighboring community in t using the path loss algorithm of shadow fadingi+1The channel quality at moment.
    8, terminal as claimed in claim 2, which is characterized in that the processing module is specifically used for: existed according to the terminal in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted+1The channel quality at moment executes the cell switch process of the terminal.
    9, terminal as claimed in claim 8, which is characterized in that the processing module is specifically used for: if the macrocell in the first threshold value and the neighboring community that movement speed of the terminal at the moment is greater than setting is in ti+1The macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell not less than the threshold value of setting by the channel quality at moment;Or
    If the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, and the macrocell in the neighboring community is in ti+1The macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value not less than the threshold value of setting by the channel quality at moment;Or
    If the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is non-real-time service, from the adjacent of prediction The neighboring community for selecting channel quality best in cell is switched to the Target cell by the serving cell as Target cell, and by the terminal, and first threshold value is greater than second threshold value;If movement speed of the terminal at the moment is less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, the neighboring community for selecting channel quality best from the neighboring community of prediction is switched to the Target cell by the serving cell as Target cell, and by the terminal.
    10, the described in any item terminals of such as claim 1 ~ 4, which is characterized in that the size of the monitoring cycle is the handover delay size of the terminal, wherein the handover delay size refers to the time completed from handover trigger to switching.
    11, a kind of cell switching method, which is characterized in that this method comprises:
    In the currently monitored moment ttWhen arrival, prediction is current to provide the serving cell of service and at least one neighboring community of the serving cell at next monitoring moment for terminal+1Channel quality, wherein tM ^ tt+ T, for the monitoring cycle of setting ,=0,1,2 ...;
    The channel quality of at least one neighboring community described according to the channel quality of the serving cell predicted and predicting, executes the cell switch process of the terminal.
    12, method as claimed in claim 11, which is characterized in that the channel quality of at least one neighboring community described according to the channel quality of the serving cell predicted and predicting executes the cell switch process of the terminal, comprising:
    When threshold value of the channel quality of the serving cell predicted lower than setting, exist according to the neighboring community each of is predicted+1The channel quality at moment selects a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell.
    13, method as claimed in claim 11, which is characterized in that initial monitor moment ^) it is at the time of setting at random, alternatively, at the time of to meet the trigger condition of setting.
    14, method as claimed in claim 13, which is characterized in that the trigger condition includes threshold value of the signal quality lower than setting of the current serving cell of terminal.
    15, the described in any item methods of such as claim 11 ~ 14, which is characterized in that predict the service Cell and the neighboring community exist+1The channel quality at moment, comprising:
    According to Gauss-Markov mobility model, predict the serving cell and the neighboring community+1The channel quality at moment.
    16, method as claimed in claim 15, which is characterized in that according to Gauss-Markov mobility model, predict the serving cell and the neighboring community exists+1The channel quality at moment, comprising: obtain the terminal in ttThe location information at moment, the location information include the terminal in ttThe movement speed and moving direction at moment;
    Location information according to the terminal at the moment predicts that the terminal exists+1The location information at moment;And
    According to the location information that prediction obtains, predict the serving cell and the neighboring community in the channel quality at moment.
    17, the method described in claim 16, which is characterized in that according to the location information that prediction obtains, predict that the serving cell and the neighboring community exist+1The channel quality at moment, comprising:
    According to the location information that prediction obtains, the range information of base station belonging to the terminal to the serving cell and the neighboring community is determined respectively;
    It predicts the serving cell using the path loss algorithm of shadow fading according to the range information of base station belonging to the terminal to the serving cell determined and exists+1The channel quality at moment;And the range information of the base station according to belonging to the terminal to the neighboring community determined predicts the neighboring community in t using the path loss algorithm of shadow fadingi+1The channel quality at moment.
    18, method as claimed in claim 12, which is characterized in that exist according to the neighboring community each of is predicted+1The channel quality at moment selects a neighboring community as Target cell, and the terminal is switched to the Target cell by the serving cell, comprising:
    According to the terminal service class currently transmitted in the movement speed at moment and/or the terminal Type and each neighboring community predicted exist+1The channel quality at moment executes the cell switch process of the terminal.
    19, method as claimed in claim 18, which is characterized in that existed according to the terminal in the currently transmitted type of service of the movement speed at moment and/or the terminal and each neighboring community predicted+1The channel quality at moment executes the cell switch process of the terminal, comprising: if the macrocell in the first threshold value and the neighboring community that movement speed of the terminal at the moment is greater than setting is in ti+1The macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell not less than the threshold value of setting by the channel quality at moment;Or
    If the terminal the moment movement speed no more than setting the first threshold value and not less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, and the macrocell in the neighboring community is in ti+1The macrocell is chosen to be Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value not less than the threshold value of setting by the channel quality at moment;Or
    If movement speed of the terminal at the moment no more than the first threshold value set and is not less than the second threshold value set, and the currently transmitted business of the terminal is non-real-time service, the neighboring community for selecting channel quality best from the neighboring community of prediction is as Target cell, and the terminal is switched to the Target cell by the serving cell, first threshold value is greater than second threshold value;If movement speed of the terminal at the moment is less than the second threshold value of setting, and the currently transmitted business of the terminal is real time business, the neighboring community for selecting channel quality best from the neighboring community of prediction is switched to the Target cell by the serving cell as Target cell, and by the terminal.
    20, the described in any item methods of such as claim 11 ~ 14, which is characterized in that the size of the monitoring cycle is the handover delay size of the terminal, wherein the handover delay size refers to the time completed from handover trigger to switching.
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