CN101815330A - Selection method, system and device for switching candidate target cells - Google Patents
Selection method, system and device for switching candidate target cells Download PDFInfo
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- CN101815330A CN101815330A CN200910078539A CN200910078539A CN101815330A CN 101815330 A CN101815330 A CN 101815330A CN 200910078539 A CN200910078539 A CN 200910078539A CN 200910078539 A CN200910078539 A CN 200910078539A CN 101815330 A CN101815330 A CN 101815330A
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Abstract
The embodiment of the invention discloses a selection method for switching candidate target cells, which comprises the following steps: a base station receives a measuring report message transmitted by a terminal and carrying a sign of entering a cell edge, and saves the corresponding relation between an adjacent cell identification carried in the measuring report message and the signal intensity value; and after the base station determines to carry out cell switching on the terminal, according to the corresponding relation, the adjacent cell identification corresponding to the signal intensity meeting a preset switching threshold is determined, and the adjacent cell corresponding to the adjacent cell identification is selected as a candidate target cell for switching the terminal. The embodiment of the invention also discloses a selection system and device for switching the candidate target cells. The invention can improve the possibility of selecting the best candidate target cell when the terminal carries out cell switching and reduce the probability of switching failure.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of system of selection, system and equipment of switching candidate target cells.
Background technology
In long-term advancing time division duplex (LTE TDD) system, radio network controller among original 3G (RNC) no longer exists, undertaken alternately by X2 interface between the base station (eNB), undertaken alternately by the S1 interface between mobile management entity in eNB and the core net (MME) or the gateway (S-GW), the network architecture as shown in Figure 1.
Because the variation of network configuration brings wireless access network (RAN) and the variation of core net (CN) on function is divided, the partial function of being finished by RNC among original 3G is finished by eNB in the LTE system, switches such as the sub-district of subscriber equipment (UE) and is controlled by eNB.
The measurement of UE reports the process that triggering cell is switched roughly can be divided into following three steps:
First step: measurement reports;
In this step, UE carries out the measurement of Serving cell and adjacent cell signal quality according to the measurement configuration of network side after entering Radio Resource control (RRC) connection status.Along with UE moves to cell edge, the signal strength signal intensity that UE measures Serving cell weakens gradually, the signal strength signal intensity of adjacent sub-district strengthens gradually, when the signal strength signal intensity that surpasses the signal intensity ratio Serving cell of Serving cell and adjacent sub-district when the signal strength signal intensity of adjacent sub-district was higher than the trigger gate limit value of setting, UE sent to the eNB of its ownership and is used for the trigger network side this UE is carried out the measurement reporting message that switch the sub-district.
Network side mainly comprises allocating and measuring object, measuring amount and measures report condition the measurement configuration of UE.Wherein, measuring object is meant the adjacent sub-district that UE will measure, and each measuring object comprises the adjacent sub-district that a class frequency is identical, bandwidth is identical; Measuring amount generally comprises signal strength parameters such as Reference Signal Received Power and Reference Signal Received Quality; Measure report condition and described the mode that the triggering measurement reports, comprise periodic report, reporting events and corresponding triggering thresholding.The content of measuring reporting message comprises the measurement result of Serving cell measurement result and measuring object one group of neighbour sub-district down.
Periodic report is meant that UE periodically sends the measurement reporting message to network side according to the time interval of measuring in the configuration.Reporting events is that UE measures according to the measuring amount of configuration, sends the measurement reporting message when measurement result meets some requirements to network side.The measurement that UE carried out when switched the sub-district reports and belongs to reporting events.
Comprise the measurement result tabulation of measuring ID (configuration that sign one cover is measured), Serving cell measurement result, one group of adjacent sub-district in the measurement reporting message that UE sends.UE constantly measures the signal strength signal intensity of adjacent sub-district and compares with the signal strength signal intensity of Serving cell, when the signal strength signal intensity that surpasses the signal intensity ratio Serving cell of Serving cell and adjacent sub-district when the signal strength signal intensity of adjacent sub-district is higher than the threshold value of setting, the UE measurement reports, and measures the adjacent cell list that carries in the reporting message and has comprised the identical adjacent sub-district of a group switching centre frequency.
Second step: switch and prepare.
After eNB receives and measures reporting message, from the adjacent sub-district that the measurement reporting message comprises, choose N the adjacent sub-district that signal strength signal intensity satisfies the handoff threshold value, and send handoff request to the eNB of this N adjacent sub-district respectively, the eNB that receives handoff request carries out acceptance judging to this UE, if admission judgment result is for to admit successfully, then send and admit success response message to the eNB that sends handoff request, if admission judgment result for admitting failure, then sends to the eNB that sends handoff request and admits failure response message.The eNB that sends handoff request is called source eNB, the eNB that receives handoff request is called target eNB.
Source eNB has two kinds to the mode that target eNB sends handoff request, and a kind of is to send by the X2 interface between two eNB, and another kind is that source eNB sends to target eNB by MME with handoff request, is undertaken alternately by the S2 interface between eNB and the MME.
Third step: switch and carry out.
In this step, after source eNB receives and admits response message, choose a business admission situation and preferably reach the highest target eNB of signal strength signal intensity from send the target eNB of admitting success response message, send switching command to UE, UE inserts to the target eNB that source eNB chooses according to this switching command.
Network side switches except carry out the sub-district after receiving the measurement reporting message of UE, reaches balanced in order to make cell load, and network side also forces UE to carry out the sub-district switching, specifically also comprises following three steps:
First step, the management station of network side sends to source base station and forces switching command, forces to comprise in the switching command management station according to the number of definite to be switched UE and the candidate target cells of switching artificially are set;
Second step after source base station receives switching command, is chosen to be switched UE according to this switching command from the UE of this sub-district, and the candidate target cells that carries in switching command sends handoff request.After the base station of candidate target cells receives handoff request, carry out acceptance judging, if admission judgment result for to admit successfully, then sends to source eNB and admits success response message, if admission judgment result for admitting failure, then sends to source eNB and admits failure response message.
Third step, source eNB chooses a business admission situation and preferably reaches the highest target eNB of signal strength signal intensity from send the target eNB of admitting success response message, send switching command to UE, and UE inserts to the target eNB that source eNB chooses according to this switching command.
In realizing process of the present invention, the inventor finds to exist in the prior art following technical problem:
Network side is when switching to this candidate target cells according to the candidate target cells that the switching of selection terminal artificially is set and with UE, the possibility of choosing the optimal candidate Target cell is less, and, occur probably because the signal strength signal intensity of candidate target cells does not satisfy the handoff failure that switching condition causes.
Summary of the invention
The embodiment of the invention provides a kind of system of selection, system and equipment of switching candidate target cells, be used to improve terminal carry out the sub-district when switching network side choose the possibility of optimal candidate Target cell, reduce the probability of handoff failure.
The embodiment of the invention provides a kind of system of selection of switching candidate target cells, and this method comprises:
The base station receiving terminal is sent carries the measurement reporting message that enters the cell edge sign, preserves the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values;
After the base station is determined to carry out the sub-district switching to described terminal, according to described corresponding relation, determine the adjacent cell ID of the signal strength signal intensity correspondence of the satisfied handoff threshold value that sets in advance, and choose the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence as described terminal switching.
The embodiment of the invention provides a kind of selective system of switching candidate target cells, and this system comprises:
Terminal is used for sending to the base station and carries the measurement reporting message that enters the cell edge sign;
The base station is used to receive described measurement reporting message, preserves the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values; After determining that need carry out the sub-district to described terminal switches, according to described corresponding relation, determine the adjacent cell ID of the signal strength signal intensity correspondence of the satisfied handoff threshold value that sets in advance, and choose the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence as described terminal switching.
The embodiment of the invention provides a kind of base station, and this base station comprises:
The message sink unit is used for the measurement reporting message that enters the cell edge sign that carries that receiving terminal sends;
Information is preserved the unit, is used for preserving the adjacent cell ID that described measurement reporting message carries and the corresponding relation of signal strength values;
Carry out determining unit, be used for determining that need carry out the sub-district to described terminal switches;
First chooses the unit, be used for after described execution determining unit determines to carry out described terminal the sub-district switching, preserve the corresponding relation that the unit is preserved according to described information, determine the adjacent cell ID of the signal strength signal intensity correspondence of the satisfied handoff threshold value that sets in advance, and choose the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence as described terminal switching.
The embodiment of the invention provides a kind of terminal, and this terminal comprises:
Detecting unit is used to detect the signal strength signal intensity of Serving cell and adjacent sub-district;
First reports the unit, be used for during greater than the first trigger gate limit value, carrying the measurement reporting message that enters the cell edge sign less than the difference of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and the signal strength signal intensity of Serving cell to the transmission of described base station in the signal strength signal intensity of determining Serving cell.
Among the present invention, the base station receives that terminal sends when carrying the measurement reporting message that enters the cell edge sign, preserves the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values; After determining that need carry out the sub-district to terminal switches, from the adjacent sub-district of preserving, choose the candidate target cells that switch as terminal the adjacent sub-district of satisfying switching condition.By the measurement when entering the cell edge area reports and chooses candidate target cells according to terminal, can effectively avoid network side to choose candidate target cells and choose, and because the signal strength signal intensity of candidate target cells does not satisfy the problem that switching condition causes handoff failure less than the optimal candidate Target cell according to artificial setting.
Description of drawings
Fig. 1 is the part configuration diagram of LTE system in the prior art;
The method flow schematic diagram that Fig. 2 provides for the embodiment of the invention;
Fig. 3 A is the schematic flow sheet that the UE measurement reports in the embodiment of the invention;
Fig. 3 B is that UE carries out the schematic flow sheet that switch the sub-district in the embodiment of the invention;
Fig. 3 C forces UE to carry out the schematic flow sheet that switch the sub-district in the embodiment of the invention;
The system configuration schematic diagram that Fig. 4 provides for the embodiment of the invention;
The architecture of base station schematic diagram that Fig. 5 provides for the embodiment of the invention;
The terminal structure schematic diagram that Fig. 6 provides for the embodiment of the invention.
Embodiment
Carry out choosing when switch the sub-district possibility of optimal candidate Target cell in order to improve terminal, reduce the probability of handoff failure, the embodiment of the invention provides a kind of system of selection of switching candidate target cells, in this method, network side receive that terminal sends carry the measurement reporting message that enters the cell edge sign time, the information of adjacent cells that carries in this measurement reporting message is preserved, and terminal is being carried out the sub-district when switching, from the adjacent sub-district of preserving, choose the candidate target cells that switch as terminal the adjacent sub-district of satisfying switching condition.
Referring to Fig. 2, the system of selection of the switching candidate target cells that the embodiment of the invention provides specifically may further comprise the steps:
Step 20: the base station receiving terminal is sent carries the measurement reporting message that enters the cell edge sign;
Step 21: the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values are preserved in the base station;
Step 22: the base station determines that need carry out the sub-district to terminal switches;
Step 23: the adjacent cell ID of the signal strength signal intensity correspondence of the satisfied handoff threshold value that sets in advance is determined according to the corresponding relation of preserving in the base station, and chooses the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence as the terminal switching.
In the step 20, it is as follows that terminal sends the concrete steps of carrying the measurement reporting message that enters the cell edge sign:
Terminal detects the signal strength signal intensity of Serving cell and adjacent sub-district according to the first measurement configuration signal that the base station issues; When the signal strength signal intensity of determining adjacent sub-district is measured trigger gate limit value that in configuration signal measurement report condition comprise with the difference of the signal strength signal intensity of Serving cell greater than first greater than the signal strength signal intensity of the signal strength signal intensity of Serving cell and adjacent sub-district, send to the base station and to carry the measurement reporting message that enters the cell edge sign, carry the corresponding relation of the signal strength values of the sign of adjacent sub-district of detection and this neighbour sub-district in this measurement reporting message.Measure the trigger gate limit value that comprises in the configuration signal with first and be called the first trigger gate limit value, the first trigger gate limit value can have one or more.
Step 22 and step 23 specifically comprise following two embodiment:
Embodiment one:
In the present embodiment, the base station determines that need carry out the sub-district to terminal switches when receiving the switching command that network management entity sends, and this switching command can be the pressure switching command that network management entity is sent for balanced cell load.Then, the candidate target cells that switch as terminal the adjacent sub-district of satisfying switching condition is chosen in the base station from the adjacent sub-district of preserving, that is: according to the corresponding relation of preserving, determine the adjacent cell ID of the signal strength signal intensity correspondence of the satisfied handoff threshold value that sets in advance, choose the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence then as the terminal switching.
Embodiment two:
In the present embodiment, the base station receive that terminal sends carry the measurement reporting message that triggers switching mark the time, determine that need carry out the sub-district to described terminal switches.The base station except from the adjacent sub-district of preserving, choose satisfy switching condition adjacent sub-district as the switching candidate target cells, also choose the candidate target cells that switch as terminal the adjacent sub-district of satisfying switching condition in the adjacent sub-district of from carry the measurement reporting message that triggers switching mark, carrying, concrete, at first obtain the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of handoff threshold value then according to this corresponding relation, and choose the candidate target cells that switch as terminal the adjacent sub-district of this neighbour's cell ID correspondence.In the present embodiment, choose candidate target cells in the adjacent sub-district that carry the base station and choose candidate target cells from carry the measurement reporting message that enters the cell edge sign from the adjacent sub-district of preserving, both sequential relationships can be any.
It is as follows that terminal sends the concrete steps of carrying the measurement reporting message that triggers switching mark:
Terminal detects the signal strength signal intensity of Serving cell and adjacent sub-district according to the second measurement configuration signal that the base station issues; When the signal strength signal intensity of determining adjacent sub-district is measured trigger gate limit value that in configuration signal measurement report condition comprise with the difference of the signal strength signal intensity of Serving cell greater than second greater than the signal strength signal intensity of the signal strength signal intensity of Serving cell and adjacent sub-district, send to the base station and to carry the measurement reporting message that triggers switching mark, carry the corresponding relation of the signal strength values of the sign of adjacent sub-district of detection and this neighbour sub-district in this measurement reporting message.Measure the trigger gate limit value that comprises in the configuration signal with second and be called the second trigger gate limit value.Because carrying the measurement reporting message that triggers switching mark is to be used for the trigger network side terminal is switched, carrying the measurement reporting message that enters the cell edge sign is to be used for entering cell edge to the network side reporting terminal, and therefore the second trigger gate limit value can be greater than the first trigger gate limit value.
Preferable, in order further to improve the scope of choosing of candidate target cells, in the setting-up time section after the base station is determined to carry out the sub-district switching to terminal, if the base station receives the measurement reporting message that enters little distinctive emblem or trigger switching mark that carries that terminal sends once more, then choose the candidate target cells that switch as terminal the adjacent sub-district of satisfying switching condition in the adjacent sub-district of from this measurement reporting message, carrying, concrete: as at first to obtain the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of handoff threshold value then according to this corresponding relation, and choose the candidate target cells that switch as terminal the adjacent sub-district of this neighbour's cell ID correspondence.
Need to prove, for the foregoing description one, choose candidate target cells and from the adjacent sub-district of preserving, choose candidate target cells in the adjacent sub-district of carrying the measurement reporting message that the base station receives in the setting-up time section after determining to carry out the sub-district switching to terminal, both sequential relationships can be any, for the foregoing description two, choose candidate target cells and from the adjacent sub-district of preserving, choose candidate target cells in the adjacent sub-district of carrying the measurement reporting message that the base station receives in the setting-up time section after determining to carry out the sub-district switching to terminal, and choose candidate target cells from carrying in the adjacent sub-district of carrying the measurement reporting message that enters the cell edge sign of switching of triggering cell, three's sequential relationship also can be any.
Behind the candidate target cells that the base station selection terminal is switched, send handoff request to each candidate target cells of choosing.After the base station of candidate target cells receives handoff request, terminal is carried out acceptance judging, if admission judgment result for to admit successfully, then sends and admits success response message, if admission judgment result for admitting failure, then sends and admits failure response message.After the base station that sends handoff request receives and admits success response message and/or admit failure response message, from send the candidate target cells of admitting success response message, choose a signal strength signal intensity and/or admittance situation and satisfy the candidate target cells that imposes a condition, and sending the switching command carry the cell information of choosing to terminal, the candidate target cells that terminal is carried in this switching command inserts.
Preferable, what receive in the base station that terminal sends carries after the measurement reporting message that enters the cell edge sign, if receive the measurement reporting message that leaves the cell edge sign that carries that this terminal sends, the then adjacent cell ID preserved of deletion and the corresponding relation of signal strength values.Switch to candidate target cells to avoid the base station to choose candidate target cells and will leave the terminal that cell edge enters center of housing estate, thereby avoid because the handoff failure that the candidate target cells signal strength signal intensity does not satisfy condition and causes according to the invalid information of preserving.
It is specific as follows that terminal sends the step of carrying the measurement reporting message that leaves the cell edge sign:
Terminal detects the signal strength signal intensity of Serving cell and adjacent sub-district according to the 3rd measurement configuration signal that the base station issues; Measure when measuring trigger gate limit value sum that report condition comprises greater than the signal strength signal intensity of adjacent sub-district in the configuration signal in the signal strength signal intensity of determining Serving cell and the 3rd, the measurement reporting message that leaves the cell edge sign is carried in transmission to the base station.Measure the trigger gate limit value that comprises in the configuration signal with the 3rd and be called the 3rd trigger gate limit value.The 3rd trigger gate limit value can equal the first trigger gate limit value.
As shown in Figure 3A, for terminal is entering cell edge and is leaving the flow chart that the cell edge measurement reports, before carrying out this flow process, the base station sends two to UE and measures configuration signal, wherein, a measurement configuration signal is used for indicating terminal measurement when satisfying the first measurement report condition and reports, first measures report condition is: the signal strength signal intensity of the adjacent sub-district of detection is greater than the signal strength signal intensity of Serving cell, and the difference of the signal strength signal intensity of adjacent sub-district and the signal strength signal intensity of Serving cell is greater than the first trigger gate limit value, the promptly adjacent cell signal strength＞Serving cell signal strength signal intensity+first trigger gate limit value.Another measurement configuration signal is used for indicating terminal measurement when satisfying the second measurement report condition and reports, second measures report condition is: the signal strength signal intensity of the adjacent sub-district of detection is less than the signal strength signal intensity and the first trigger gate limit value sum of Serving cell, the promptly adjacent cell signal strength＜Serving cell signal strength signal intensity+first trigger gate limit value.Concrete report flow is as follows:
Step S01:UE measures the signal strength signal intensity of Serving cell and adjacent sub-district, determines to satisfy first and measures report condition;
Step S02:UE sends to the base station and carries the measurement reporting message that enters the cell edge sign, also carries the sign of adjacent sub-district of measurement and signal strength values that should neighbour sub-district correspondence in this message;
Step S03: after the base station receives and carries the measurement reporting message that enters the cell edge sign, preserve the adjacent cell ID that carries in this measurement reporting message and signal strength values that should neighbour sub-district correspondence, and record UE enters cell edge;
Step S04:UE measures the signal strength signal intensity of Serving cell and adjacent sub-district, determines to satisfy second and measures report condition;
Step S05:UE sends to the base station and carries the measurement reporting message that leaves the cell edge sign, also carries the sign of the adjacent sub-district that UE measures and signal strength values that should neighbour sub-district correspondence in this message;
Step S06: after the base station receives and carries the measurement reporting message that leaves the cell edge sign, preserve the adjacent cell ID that carries in this measurement reporting message and signal strength values that should neighbour sub-district correspondence, and leave cell edge under the record UE.
Network side can be safeguarded an adjacent cell list for each UE that is in linking status, and measure the adjacent cell ID that reports and the signal strength values of this neighbour sub-district correspondence is stored in the tabulation with UE is each, if having adjacent sub-district to be kept in the tabulation in this reported result then use this content update that reports tabulation.
Shown in Fig. 3 B, when reporting triggering cell to switch for the terminal measurement, network side is chosen the flow process of candidate target cells, before carrying out this flow process, the base station sends three to UE and measures configuration signal, wherein two to measure the measurement configuration signal that issues before configuration signal and as shown in Figure 3A the flow process identical, another measurement configuration signal is used for indicating terminal measurement when satisfying the 3rd measurement report condition and reports, the 3rd measures report condition is: the signal strength signal intensity of the adjacent sub-district of detection is greater than the signal strength signal intensity of Serving cell, and the difference of the signal strength signal intensity of adjacent sub-district and the signal strength signal intensity of Serving cell is greater than the second trigger gate limit value, the promptly adjacent cell signal strength＞Serving cell signal strength signal intensity+second trigger gate limit value.It is as follows specifically to choose flow process:
Step S11: determine to satisfy first when measuring report condition, UE sends to the base station and carries the measurement reporting message that enters the cell edge sign, also carries the sign of adjacent sub-district of the current measurement of UE and signal strength values that should neighbour sub-district correspondence in this message;
Step S12: after the base station receives and carries the measurement reporting message that enters the cell edge sign, preserve the adjacent cell ID that carries in this measurement reporting message and signal strength values that should neighbour sub-district correspondence, and record UE enters cell edge;
Step S13: determine to satisfy the 3rd when measuring report condition, UE sends to the base station and carries the measurement reporting message that triggers switching mark, also carries the sign of the adjacent sub-district that current UE measures and signal strength values that should neighbour sub-district correspondence in this message;
Step S14: the base station from the adjacent sub-district of preserving and carry choose in the adjacent sub-district of carrying the measurement reporting message that triggers switching mark satisfy switching condition adjacent sub-district as the candidate target cells that switches;
Step S15: the base station sends handoff request to the candidate target cells of choosing;
Step S16: candidate target cells feedback handover request ack message comprises and admits success response message or admit failure response message;
Step S17: determine to satisfy the 3rd when measuring report condition, UE sends to the base station once more and carries the measurement reporting message that triggers switching mark, also carries the sign of the adjacent sub-district that current UE measures and signal strength values that should neighbour sub-district correspondence in this message;
Step S18: choose the adjacent sub-district of satisfying switching condition in the adjacent sub-district that carry the base station from the measurement reporting message that this receives as the candidate target cells that switches;
Step S 19: the base station sends handoff request to this candidate target cells of choosing;
Step S20: candidate target cells feedback handover request ack message comprises and admits success response message or admit failure response message;
Step S21: a signal strength signal intensity and the best candidate target cells of admittance situation are chosen in the base station from send the candidate target cells of admitting success response message;
Step S22: the base station sends to terminal and carries the switching command of the candidate target cells information of choosing.
Shown in Fig. 3 C, when carrying out the sub-district switching for the terminal of network inclination, network side is chosen the flow process of candidate target cells, before carrying out this flow process, the base station sends one to UE and measures configuration signal, this measurement configuration signal is used for indicating terminal measurement when satisfying the first measurement report condition and reports, and the first measurement report condition is the same.It is as follows specifically to choose flow process:
Step S31: determine to satisfy first when measuring report condition, UE sends to the base station and carries the measurement reporting message that enters the cell edge sign, also carries the sign of adjacent sub-district of the current measurement of UE and signal strength values that should neighbour sub-district correspondence in this message;
Step S32: after the base station receives and carries the measurement reporting message that enters the cell edge sign, preserve the adjacent cell ID that carries in this measurement reporting message and signal strength values that should neighbour sub-district correspondence, and record UE enters cell edge;
Step S33: management station sends to the base station and forces switching command;
Step S34: the base station from the adjacent sub-district of preserving, choose satisfy switching condition adjacent sub-district as the candidate target cells that switches;
Step S35: the base station sends handoff request to the candidate target cells of choosing;
Step S36: candidate target cells feedback handover request ack message comprises and admits success response message or admit failure response message;
Step S37: a signal strength signal intensity and the best candidate target cells of admittance situation are chosen in the base station from send the candidate target cells of admitting success response message;
Step S38: the base station sends to terminal and carries the switching command of the candidate target cells information of choosing.
Referring to Fig. 4, the embodiment of the invention also provides a kind of selective system of switching candidate target cells, and this system comprises:
This system further comprises:
Described base station 41 is used for: when receiving described switching command, determine that need carry out the sub-district to described terminal switches.
Described terminal 40 also is used for: send to described base station and carry the measurement reporting message that triggers switching mark;
Described base station 41 is used for: receive describedly when carrying the measurement reporting message that triggers switching mark, determine that need carry out the sub-district to described terminal switches; According to the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
Described base station 41 also is used for: when determining to receive after need carry out the sub-district to described terminal switches the measurement reporting message that described terminal sends, according to the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
Described base station 41 also is used for: send handoff request to each candidate target cells of choosing; From send the candidate target cells of admitting success response message, choose a signal strength signal intensity and/or admittance situation and satisfy the sub-district that imposes a condition, and send the switching command that carries the cell information of choosing to described terminal.
Described base station 41 also is used for: receive that described terminal sends carry the measurement reporting message that leaves the cell edge sign time, the described adjacent cell ID that deletion is preserved and the corresponding relation of signal strength values.
Described terminal 40 is used for:, send to described base station and to carry the measurement reporting message that enters the cell edge sign less than the difference of the signal strength signal intensity of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and Serving cell during greater than the first trigger gate limit value in the signal strength signal intensity that detects Serving cell.
Described terminal 40 is used for:, send to described base station and to carry the measurement reporting message that triggers switching mark less than the difference of the signal strength signal intensity of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and Serving cell during greater than the second trigger gate limit value in the signal strength signal intensity that detects Serving cell.The described second trigger gate limit value is greater than the described first trigger gate limit value.
Referring to Fig. 5, the embodiment of the invention also provides a kind of base station, can be applied in the selective system of switching candidate target cells, and this base station comprises:
Message sink unit 50 is used for the measurement reporting message that enters the cell edge sign that carries that receiving terminal sends;
Information is preserved unit 51, is used for preserving the adjacent cell ID that described measurement reporting message carries and the corresponding relation of signal strength values;
Carry out determining unit 52, be used for determining that need carry out the sub-district to described terminal switches;
First chooses unit 53, be used for after described execution determining unit determines to carry out described terminal the sub-district switching, preserve the corresponding relation that the unit is preserved according to described information, determine the adjacent cell ID of the signal strength signal intensity correspondence of the satisfied handoff threshold value that sets in advance, and choose the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence as described terminal switching.
Carrying out determining unit 52 is used for: when receiving the switching command that network management entity sends, determine that need carry out the sub-district to described terminal switches.
Carrying out determining unit 52 is used for: receive that described terminal sends carry the measurement reporting message that triggers switching mark the time, determine that need carry out the sub-district to described terminal switches; This base station also comprises: second chooses unit 54, be used for carrying the adjacent cell ID that the measurement reporting message that triggers switching mark carries and the corresponding relation of signal strength values according to this, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
This base station also comprises:
The 3rd chooses unit 55, be used for when determining to receive after need carry out the sub-district to described terminal switches the measurement reporting message that described terminal sends, according to the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
This base station also comprises:
Request transmitting unit 56 is used for sending handoff request to each candidate target cells of choosing; From send the candidate target cells of admitting success response message, choose a signal strength signal intensity and/or admittance situation and satisfy the sub-district that imposes a condition, and send the switching command that carries the cell information of choosing to described terminal.
This base station also comprises:
Information updating unit 57, be used for receive that described terminal sends carry the measurement reporting message that leaves the cell edge sign time, delete described information and preserve the described adjacent cell ID preserved the unit and the corresponding relation of signal strength values.
Referring to Fig. 6, the embodiment of the invention also provides a kind of terminal, can be applied in the selective system of switching candidate target cells, and this terminal comprises:
Detecting unit 60 is used to detect the signal strength signal intensity of Serving cell and adjacent sub-district;
First reports unit 61, be used for during greater than the first trigger gate limit value, carrying the measurement reporting message that enters the cell edge sign less than the difference of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and the signal strength signal intensity of Serving cell to the transmission of described base station in the signal strength signal intensity of determining Serving cell.
This terminal also comprises:
Second reports unit 62, be used for during greater than the second trigger gate limit value, sending the measurement reporting message that carries the triggering switching mark less than the difference of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and the signal strength signal intensity of Serving cell to described base station in the signal strength signal intensity of determining Serving cell.The described second trigger gate limit value is greater than the described first trigger gate limit value.
To sum up, beneficial effect of the present invention comprises:
In the scheme that the embodiment of the invention provides, the base station receives that terminal sends when carrying the measurement reporting message that enters the cell edge sign, preserves the corresponding relation of the adjacent cell sign of carrying in this measurement reporting message and signal strength values; Determining and to carry out the residential quarter when switching to terminal, from the adjacent cell of preserving, choosing the candidate target cells that the adjacent cell that satisfies switching condition is switched as terminal. By the measurement when entering the cell edge area reports and chooses candidate target cells according to terminal, can effectively avoid network side to choose candidate target cells according to artificial setting and choose less than the optimal candidate Target cell, and because the signal strength signal intensity of candidate target cells does not satisfy the problem that switching condition causes handoff failure.
In the scheme that the embodiment of the invention provides, when the base station is determined to carry out the residential quarter switching to terminal at the measurement reporting message that carries the triggering switching mark that receives UE, from the adjacent cell of preserving and in the adjacent cell of carrying in this measurement reporting message, choose the candidate target cells that meets switching condition, with choose candidate target cells in the adjacent cell of only from this measurement reporting message, carrying and compare, the range of choice of candidate target cells is bigger, thereby can increase the probability of choosing the optimal candidate Target cell, effectively avoid the UE handoff failure that causes in the less situation of the adjacent cell number that in this measurement reporting message, carries, reduced the call drop probability of UE.
And, in the scheme that the embodiment of the invention provides, in the setting-up time section after determining to carry out the residential quarter switching to terminal, if the base station receives the measurement reporting message that enters little distinctive emblem or trigger switching mark that carries that terminal sends again, choose the candidate target cells that the adjacent cell that satisfies switching condition is switched as terminal in the adjacent cell of then from this measurement reporting message, carrying, further increased the range of choice of candidate target cells, and then increase the probability of choosing the optimal candidate Target cell, reduced the call drop probability of UE.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention. Like this, if of the present invention these are revised and modification belongs to the range of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (20)
1. the system of selection of a switching candidate target cells is characterized in that, this method comprises:
The base station receiving terminal is sent carries the measurement reporting message that enters the cell edge sign, preserves the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values;
After the base station is determined to carry out the sub-district switching to described terminal, according to described corresponding relation, determine the adjacent cell ID of the signal strength values correspondence of the satisfied handoff threshold value that sets in advance, and choose the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence as described terminal switching.
2. the method for claim 1 is characterized in that, described base station determines that need carry out the sub-district switching to described terminal comprises:
When described base station receives the switching command that network management entity sends, determine that need carry out the sub-district to described terminal switches.
3. the method for claim 1 is characterized in that, described base station determines that need carry out the sub-district switching to described terminal comprises:
Described base station receives that described terminal sends when carrying the measurement reporting message that triggers switching mark, determines that need carry out the sub-district to described terminal switches;
After the sub-district switching was determined to carry out described terminal in described base station, this method further comprised:
Described base station is according to the described adjacent cell ID that carries in the measurement reporting message that triggers switching mark and the corresponding relation of signal strength values of carrying, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
4. the method for claim 1 is characterized in that, after the sub-district switching was determined to carry out described terminal in the base station, this method further comprised:
Described base station receives the measurement reporting message that described terminal is sent, according to the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
5. as arbitrary described method among the claim 1-4, it is characterized in that after choosing the candidate target cells that switches as described terminal adjacent sub-district, this method further comprises:
Described base station sends handoff request to each candidate target cells of choosing;
From send the candidate target cells of admitting success response message, choose a signal strength signal intensity and/or admittance situation and satisfy the sub-district that imposes a condition, and send the switching command that carries the cell information of choosing to described terminal.
6. the method for claim 1 is characterized in that, what receive in the base station that terminal sends carries after the measurement reporting message that enters the cell edge sign, and this method further comprises:
Described base station receives the measurement reporting message that leaves the cell edge sign that carries that described terminal sends, the described adjacent cell ID that deletion is preserved and the corresponding relation of signal strength values.
7. method as claimed in claim 3, it is characterized in that, described terminal, sends to described base station and to carry the measurement reporting message that enters the cell edge sign less than the difference of the signal strength signal intensity of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and Serving cell during greater than the first trigger gate limit value in the signal strength signal intensity that detects Serving cell.
8. method as claimed in claim 7, it is characterized in that, described terminal, sends to described base station and to carry the measurement reporting message that triggers switching mark less than the difference of the signal strength signal intensity of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and Serving cell during greater than the second trigger gate limit value in the signal strength signal intensity that detects Serving cell; And the described second trigger gate limit value is greater than the described first trigger gate limit value.
9. the selective system of a switching candidate target cells is characterized in that, this system comprises:
Terminal is used for sending to the base station and carries the measurement reporting message that enters the cell edge sign;
The base station is used to receive described measurement reporting message, preserves the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values; After determining that need carry out the sub-district to described terminal switches, according to described corresponding relation, determine the adjacent cell ID of the signal strength signal intensity correspondence of the satisfied handoff threshold value that sets in advance, and choose the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence as described terminal switching.
10. system as claimed in claim 9 is characterized in that, this system further comprises:
Network management entity is used for sending switching command to described base station;
Described base station is used for: when receiving described switching command, determine that need carry out the sub-district to described terminal switches.
11. system as claimed in claim 9 is characterized in that, described terminal also is used for:
Send the measurement reporting message that carries the triggering switching mark to described base station;
Described base station is used for: receive describedly when carrying the measurement reporting message that triggers switching mark, determine that need carry out the sub-district to described terminal switches; According to the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
12. system as claimed in claim 9 is characterized in that, described base station also is used for:
When determining to receive after need carry out the sub-district to described terminal switches the measurement reporting message that described terminal sends, according to the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
13. a base station is characterized in that, this base station comprises:
The message sink unit is used for the measurement reporting message that enters the cell edge sign that carries that receiving terminal sends;
Information is preserved the unit, is used for preserving the adjacent cell ID that described measurement reporting message carries and the corresponding relation of signal strength values;
Carry out determining unit, be used for determining that need carry out the sub-district to described terminal switches;
First chooses the unit, be used for after described execution determining unit determines to carry out described terminal the sub-district switching, preserve the corresponding relation that the unit is preserved according to described information, determine the adjacent cell ID of the signal strength signal intensity correspondence of the satisfied handoff threshold value that sets in advance, and choose the candidate target cells of the adjacent sub-district of this neighbour's cell ID correspondence as described terminal switching.
14. base station as claimed in claim 13 is characterized in that, described execution determining unit is used for:
When receiving the switching command that network management entity sends, determine that need carry out the sub-district to described terminal switches.
15. base station as claimed in claim 13 is characterized in that, described execution determining unit is used for:
Receive that described terminal sends carry the measurement reporting message that triggers switching mark the time, determine that need carry out the sub-district to described terminal switches;
This base station also comprises: second chooses the unit, be used for according to the described adjacent cell ID that the measurement reporting message that triggers switching mark carries and the corresponding relation of signal strength values of carrying, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
16. base station as claimed in claim 13 is characterized in that, this base station also comprises:
The 3rd chooses the unit, be used for when determining to receive after need carry out the sub-district to described terminal switches the measurement reporting message that described terminal sends, according to the adjacent cell ID that carries in this measurement reporting message and the corresponding relation of signal strength values, determine to satisfy the adjacent cell ID of the signal strength signal intensity correspondence of described handoff threshold value, and choose the candidate target cells that switch as described terminal the adjacent sub-district of this neighbour's cell ID correspondence.
17., it is characterized in that this base station also comprises as arbitrary described base station among the claim 13-16:
Request transmitting unit is used for sending handoff request to each candidate target cells of choosing; From send the candidate target cells of admitting success response message, choose a signal strength signal intensity and/or admittance situation and satisfy the sub-district that imposes a condition, and send the switching command that carries the cell information of choosing to described terminal.
18. base station as claimed in claim 13 is characterized in that, this base station also comprises:
Information updating unit, be used for receive that described terminal sends carry the measurement reporting message that leaves the cell edge sign time, delete described information and preserve the described adjacent cell ID preserved the unit and the corresponding relation of signal strength values.
19. a terminal is characterized in that, this terminal comprises:
Detecting unit is used to detect the signal strength signal intensity of Serving cell and adjacent sub-district;
First reports the unit, be used for during greater than the first trigger gate limit value, carrying the measurement reporting message that enters the cell edge sign less than the difference of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and the signal strength signal intensity of Serving cell to the transmission of described base station in the signal strength signal intensity of determining Serving cell.
20. terminal as claimed in claim 19 is characterized in that, this terminal also comprises:
Second reports the unit, be used for during greater than the second trigger gate limit value, sending the measurement reporting message that carries the triggering switching mark less than the difference of the signal strength signal intensity of the signal strength signal intensity of adjacent sub-district and adjacent sub-district and the signal strength signal intensity of Serving cell to described base station in the signal strength signal intensity of determining Serving cell; And the described second trigger gate limit value is greater than the described first trigger gate limit value.
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| CN2009100785398A CN101815330B (en) | 2009-02-25 | 2009-02-25 | Selection method, system and device for switching candidate target cells |
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| CN2009100785398A CN101815330B (en) | 2009-02-25 | 2009-02-25 | Selection method, system and device for switching candidate target cells |
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