CN103037458A - Method and terminal of cell reselection in long term evolution (LTE) system - Google Patents
Method and terminal of cell reselection in long term evolution (LTE) system Download PDFInfo
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- CN103037458A CN103037458A CN2012105244747A CN201210524474A CN103037458A CN 103037458 A CN103037458 A CN 103037458A CN 2012105244747 A CN2012105244747 A CN 2012105244747A CN 201210524474 A CN201210524474 A CN 201210524474A CN 103037458 A CN103037458 A CN 103037458A
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Abstract
The invention discloses a method and a terminal of cell reselection in a long term evolution (LTE) system. The method includes that the terminal under an idle state receives reference signals of all cells of a candidate cell collection, selects the reference signal with the maximum power among reference signals of all the cells of the candidate cell collection and judges whether the power of the reference signal with the maximum power is larger than the first preset threshold value or not, when the power of the reference signal with the maximum power is larger than the first preset threshold value, a cell with the maximum power of downlink reference signal is used as an initial reselection cell, resource load condition of the initial reselection cell is judged to be low or not according to system information, and the initial reselection cell is used as an aim reselection cell when resource load condition of the initial reselection cell is low. According to the method and the terminal of the cell reselection in the LTE system, when the terminal initiates service in the aim reselection cell, the terminal can conduct service transmission by means of free resources of the aim reselection cell, and therefore the probability that the terminal is forced to switch to another cell is small, and service interruption rate of the terminal is reduced.
Description
Technical field
The present invention relates to wireless communication technology, particularly relate to a kind of LTE system's small area reselecting method and terminal.
Background technology
At LTE(Long Term Evolution, Long Term Evolution) in the mobile communications network, the terminal after the start has two states: connection status and idle condition.When terminal had professional transmission, described terminal was in connection status, namely existed Radio Link to be connected between one of them residential quarter of certain base station in terminal and the LTE mobile communications network.In other situations, terminal is in idle condition, and described terminal can go to select a suitable residential quarter according to the cell reselection criterion, and with the cell report selected to network, this is called as the gravity treatment of residential quarter.
When terminal is carried out cell reselection between a plurality of co-frequency cells, in existing residence reselecting, terminal is according to default cell reselection criterion select target re-selecting cell, be specially: terminal is measured the RSRP(Reference Signal Received Power of former persistent district and adjacent co-frequency cell, Reference Signal Received Power), described RSRP represents to be fit to terminal in the residential quarter when being higher than a thresholding resident (it is resident that indication here shows that the residential quarter is fit to terminal, but whether terminal can reside in this residential quarter, needs also to judge whether this residential quarter meets resident condition); Then, described terminal is higher than in the RSRP value and selects the highest residential quarter of RSRP value as the target re-selecting cell in a plurality of co-frequency cells of described thresholding.
In described prior art, when terminal is carried out cell reselection, only consider the RSRP of each co-frequency cell.The problem of bringing like this is, if the target re-selecting cell that described terminal is selected can be resident, when described terminal has professional transmission, if this moment, the resource of target re-selecting cell was relatively more nervous, after connecting, described terminal and target re-selecting cell probably required to switch to the lower residential quarter of other resource load by the base station.And switch certain probability of failure is arranged, may cause disconnecting or the traffic delay of described terminal and target re-selecting cell.
Summary of the invention
The invention provides a kind of LTE system's small area reselecting method and terminal, to solve in the prior art, because of re-selecting cell resource load anxiety, the technical problem of the terminal that causes and the disconnecting of re-selecting cell or traffic delay, reduce the Service disruption ratio of terminal, improve the user and experience.
For solving the problems of the technologies described above, the invention provides a kind of LTE system's small area reselecting method and terminal, the invention provides following technical scheme:
A kind of LTE system's small area reselecting method and terminal, the method comprises:
The terminal of idle condition receives the reference signal of all residential quarters in the candidate set, and described candidate set comprises: former persistent district and a plurality of adjacent co-frequency cell;
The prominent reference signal of the reference signal selection of all residential quarters in described candidate set;
Whether judge the power of prominent reference signal greater than the first predetermined threshold value, if, then with the prominent residential quarter of downlink reference signal as initial re-selecting cell;
Judge that according to system information whether the resource load state of described initial re-selecting cell is low load, if, then with described initial re-selecting cell as the target re-selecting cell.
Preferably, described initial re-selecting cell as before the target re-selecting cell, is also comprised:
Will except select in the candidate set of described initial re-selecting cell reference signal power greater than all residential quarters of described the first predetermined threshold value as candidate set;
Calculate successively a plurality of differences of the received power of the reference signal of all residential quarters in the received power of reference signal of described initial re-selecting cell and the described candidate set, obtain power difference collection;
Judge whether described power difference converges exists the difference less than the second predetermined threshold value, if exist, then judge that according to described system information whether the edge resource load condition of described initial re-selecting cell is low load, if, then with described initial re-selecting cell as the target re-selecting cell.
Preferably, if the edge resource load condition of described initial re-selecting cell is not low load, described method also comprises:
From described candidate set, select the largest cell of reference signal power maximum;
Whether the edge resource load condition of judging described largest cell according to described system information is low load;
If, then with described largest cell as the target re-selecting cell;
If not, then will except the candidate set of described largest cell as candidate set, return the described step of from described candidate set, selecting the largest cell of reference signal power maximum;
Preferably, describedly judge that according to system information whether the resource load state of described initial re-selecting cell is low load, specifically comprises:
Whether judge the resource load of described initial re-selecting cell less than the 3rd predetermined threshold value, if determine that then the resource load state of described initial re-selecting cell is low load.
Preferably, describedly judge that according to described system information whether the edge resource load condition of described initial re-selecting cell is low load, specifically comprises:
Whether judge the edge resource load of described initial re-selecting cell less than the 4th predetermined threshold value, if determine that then the edge resource load condition of described initial re-selecting cell is low load.
The embodiment of the invention provides a kind of terminal, and described terminal is in idle condition, and described terminal comprises:
Receiving element, for the reference signal that receives all residential quarters of candidate set, described candidate set comprises: former persistent district and a plurality of adjacent co-frequency cell;
The first selected cell is used for the prominent reference signal of reference signal selection in all residential quarters of described candidate set;
The first judging unit is used for judging that whether the power of prominent reference signal is greater than the first predetermined threshold value;
The first determining unit, the power that is used for prominent reference signal be during greater than the first predetermined threshold value, with the prominent residential quarter of downlink reference signal as initial re-selecting cell;
The second judging unit is used for judging according to system information whether the resource load state of described initial re-selecting cell is low load;
The second determining unit, the resource load state that is used for described initial re-selecting cell be during for low load, with described initial re-selecting cell as the target re-selecting cell.
Preferably, described terminal also comprises:
The second selected cell, be used for select except the candidate set of described initial re-selecting cell reference signal power greater than all residential quarters of described the first predetermined threshold value as candidate set;
The difference acquiring unit is used for calculating successively a plurality of differences of received power of the reference signal of the received power of reference signal of described initial re-selecting cell and all residential quarters of described candidate set, obtains power difference collection;
The 3rd judging unit is used for judging whether described power difference converges exists the difference less than the second predetermined threshold value;
The 4th judging unit when being used for described power difference converges and having difference less than the second predetermined threshold value, judges according to described system information whether the edge resource load condition of described initial re-selecting cell is low load;
Described the second determining unit then, the edge resource load condition that specifically is used for described initial re-selecting cell be during for low load, with described initial re-selecting cell as the target re-selecting cell.
Preferably, described terminal also comprises:
The 3rd selected cell is used for from the largest cell of described candidate set selection reference signal power maximum;
The 5th judging unit is used for judging according to described system information whether the edge resource load condition of described largest cell is low load;
Then described the second determining unit specifically is used for, with described initial re-selecting cell as the target re-selecting cell;
Trigger element, when the edge resource load condition that is used for described largest cell is not low load, will except the candidate set of described largest cell as candidate set, trigger described the 3rd selected cell.
Preferably, described the second judging unit specifically comprises:
The first judgment sub-unit is used for judging that whether the resource load of described initial re-selecting cell is less than the 3rd predetermined threshold value;
First determines subelement, and the result who is used for described the first judgment sub-unit determines that the resource load state of described initial re-selecting cell is for hanging down load when being.
Preferably, described the 4th judging unit specifically comprises:
The second judgment sub-unit is used for judging that whether the edge resource load of described initial re-selecting cell is less than the 4th predetermined threshold value;
First determines subelement, and the result who is used for described the second judgment sub-unit determines that the edge resource load condition of described initial re-selecting cell is for hanging down load when being.
In the technical scheme of the present invention, the terminal of idle condition is determined after the initial re-selecting cell, further judge the resource load situation of initial re-selecting cell, if the resource load situation is low load, the available free frequency resource of described initial re-selecting cell then is described, like this, when described terminal resident when this residential quarter, base station under the described initial re-selecting cell just can be dispatched the frequency resource of free time to described terminal and be used, when described like this terminal is initiated business in the target re-selecting cell of selecting, the probability that is forced to switch to other residential quarters will diminish, thereby has reduced the Service disruption ratio of terminal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of the small area reselecting method embodiment of a kind of LTE of the present invention system 1;
Fig. 2 is the flow chart of the small area reselecting method embodiment of a kind of LTE of the present invention system 2;
Fig. 3 is the structural representation of a kind of terminal embodiment 1 of the present invention;
Fig. 4 is the structural representation of a kind of terminal embodiment 2 of the present invention.
Embodiment
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
With reference to shown in Figure 1, be the flow chart of a kind of LTE small area reselecting method embodiment of system 1 provided by the invention, present embodiment specifically can comprise:
Step 101: the terminal of idle condition receives the reference signal of all residential quarters in the candidate set.
In the present embodiment, candidate set can comprise: former persistent district and a plurality of adjacent co-frequency cell.In the practical communication environment, operator can use a plurality of different frequency bands.For a concrete residential quarter, can only use one of them frequency band.Use a plurality of residential quarters of identical frequency band to be called as co-frequency cell, these residential quarters are nonoverlapping, with the formal distribution of tiling.In addition, former persistent district refers to the last resident residential quarter of terminal of this idle condition.
The terminal of idle condition periodically receives the reference signal of the neighbor cell of former persistent district and described former persistent district, and a terminal specifically can receive the reference signal of which residential quarter, is specifically arranged by network side.In fact, described terminal can receive the adjacent co-frequency cell of former persistent district, former persistent district, the reference signal of adjacent alien-frequency district, present embodiment comprises that take the candidate set that network side arranges terminal former persistent district and a plurality of adjacent co-frequency cell are as example, reference signal for alien-frequency district is not considered here.
Step 102: the prominent reference signal of the reference signal selection of all residential quarters in described candidate set.
When described terminal receives the reference signal of adjacent co-frequency cell of former persistent district and described former persistent district, described terminal will be selected a prominent reference signal in described former persistent district and a plurality of homogeneous frequency adjacent area.
Step 103: judge that whether the power of prominent reference signal is greater than the first predetermined threshold value, if then enter step 104.
Corresponding residential quarter is suitable as re-selecting cell if the power of described prominent reference signal, illustrates described prominent reference signal greater than the first predetermined threshold value, and the residential quarter that the reference signal of maximum is corresponding is designated as initial re-selecting cell here.Described the first predetermined threshold value is not specifically limited here, because for different co-frequency cells, the first concrete predetermined threshold value is different, and its scope can be-and 70dBm is to-22dBm.If the power of prominent reference signal is not more than the first predetermined threshold value, then all residential quarters in the candidate set all are not suitable for doing the re-selecting cell of described terminal.
Step 104: whether the resource load state of judging described initial re-selecting cell according to system information is low load, if then enter step 105.
The physical layer of LTE system is take orthogonal frequency division multiplexi as the basis, thus between each terminal same residential quarter in almost without any interference, disturb the terminal of main adjacent co-frequency cell from cell edge.For the appearance of reduce disturbance, need to do some restrictions to the Radio Resource that the terminal that is in adjacent co-frequency cell edge is used, Here it is coordinating district interference.The method for cell interference coordination that more generally adopts at present is the soft-frequency reuse technology.The main feature of this technology is: mark off a special-purpose sub-band in the whole frequency band that use the residential quarter, the cell edge terminal can only use the resource of this special use sub-band to carry out the business transmission, and the center of housing estate terminal can use all band resources in whole residential quarter to carry out the business transmission.And be not occur simultaneously between the sub-band that adjacent co-frequency cell marks separately, so just guaranteed that the terminal at adjacent co-frequency cell edge can not use identical sub-carrier resources to carry out the business transmission, just reached the purpose of evading interference.
So the base station needs regularly resource load situation and the cell edge resource load situation of the interior residential quarter of its coverage of statistics, be the sub-band resources occupation rate of a period of time subdistrict frequency band resources occupation rate and cell edge special use, if occupancy is high load condition after surpassing some thresholdings.Wherein can to adopt same thresholding to identify its load be high or low to the sub-band resources occupation rate of subdistrict frequency band resources occupation rate and cell edge special use.The base station with the report the test of above-mentioned regular statistics to webmaster, webmaster is according to the affiliated relation of residential quarter neighbouring relations and residential quarter and base station, regular sends to relevant base station with above-mentioned statistics, for described terminal, after webmaster receives the statistics that the base station reports under the adjacent co-frequency cell of the former persistent district of described terminal, to in system information, upgrade the resource load information of adjacent co-frequency cell, and with the terminal of system information broadcast to idle pulley, described like this terminal just can have been judged the loading condition of each co-frequency cell by the system information that receives.
When practical operation, can adopt in such a way and realize, for two parameters of each little area definition: local resource overload sign (Resource Over load), cell edge resource overload sign (Edge Resource Over load), two parameter values all are Boolean types.Whole band resource occupancies are when higher (for example being higher than 90%) when residential quarter in a period of time, and area resource overload sign value is true (true), otherwise value is false (false).When the sub-band resources occupation rate of Cell Edge User special use in a period of time when higher (for example being higher than 90%), cell edge resource overload sign value is true, otherwise is false.These two parameters can be added to system information block 4(System Information Block4) and system information block 5(System Information Block5) in the information of each residential quarter of cell list in.
Step 105: with described initial re-selecting cell as the target re-selecting cell.
When the resource load state of the described initial re-selecting cell of sign is low in the system information, described terminal then illustrates in the described initial re-selecting cell to exist idling-resource to use, so can be treated resident target re-selecting cell as the terminal of final idle condition with described initial re-selecting cell.Like this, carry out business transmission to the described target re-selecting cell if described terminal is resident, the possibility that is forced to switch to other residential quarter can diminish, and the possibility that business is transmitted interrupt also can diminish.
In the technical scheme of present embodiment, the terminal of idle condition is determined after the initial re-selecting cell, further judge the resource load situation of initial re-selecting cell, if the resource load situation is low load, the available free frequency resource of described initial re-selecting cell then is described, like this, when described terminal resident when this residential quarter, base station under the described initial re-selecting cell just can be dispatched the frequency resource of free time to described terminal and be used, when described like this terminal is initiated business in the target re-selecting cell of selecting, the probability that is forced to switch to other residential quarters will diminish, thereby has reduced the Service disruption ratio of terminal.
Although the technical scheme by embodiment 1 can reach the purpose that reduces the terminal traffic interruption rate, does not consider the position of described terminal reality in the residential quarter in the technical scheme of embodiment.When terminal is positioned at the demarcation line of a plurality of residential quarters, in the situation of not considering interference coordination, if the edge load of target re-selecting cell is in the situation of high capacity, described terminal scheduling resource will be given in the base station under the target re-selecting cell in the frequency band except special-purpose sub-band so.In this case, described terminal can be carried out the business transmission, but can cause the interference between the co-frequency cell.
In the situation of considering interference coordination, even the resource load state of initial re-selecting cell is low load, but described terminal can only be used the special-purpose sub-band resource of initial re-selecting cell, during described terminal originating service transmission, because the edge resource load condition of initial re-selecting cell might be high capacity, like this, described terminal then can't be carried out the business transmission.The technical problem that may bring for the technical scheme that overcomes embodiment 1.With reference to shown in Figure 2, be the flow chart of a kind of LTE small area reselecting method embodiment of system 2 provided by the invention, present embodiment specifically can comprise:
Step 201: the terminal of idle condition receives the reference signal of all residential quarters in the candidate set.
Step 202: the prominent reference signal of the reference signal selection of all residential quarters in described candidate set.
Step 203: whether judge the power of prominent reference signal greater than the first predetermined threshold value, if then the residential quarter that the reference signal of maximum is corresponding is designated as initial re-selecting cell, enters step 204.
Step 204: whether the resource load state of judging initial re-selecting cell according to system information is low load, if then enter step 205.
The implementation of the step 101-step 104 of the implementation of described step 201-step 204 in can reference example 1 repeats no more herein.
Step 205: will except select in the candidate set of described initial re-selecting cell reference signal power greater than all residential quarters of described the first predetermined threshold value as candidate set.
In described candidate set, remove described initial re-selecting cell and reference signal power less than the residential quarter of described the first predetermined threshold value, with remaining residential quarter in the candidate set as candidate set.Wherein removing reference signal power is less than the residential quarter of described the first predetermined threshold value and removes the residential quarter that is not suitable as re-selecting cell.
Step 206: calculate successively a plurality of differences of the received power of the reference signal of all residential quarters in the received power of reference signal of described initial re-selecting cell and the described candidate set, obtain power difference collection.
Described step 206 forms at random a set with a plurality of differences that obtain, and is designated as the difference collection for the difference between the reference signal power of each residential quarter in the reference signal power of calculating initial re-selecting cell and the candidate set.
Step 207: judge whether described power difference converges exists the difference less than the second predetermined threshold value, if do not exist, then enters step 208, if exist, then enter step 209.
The purpose of described step 207 is to determine that described terminal is in the position of initial re-selecting cell, if the power of the reference signal of other all residential quarters of power ratio of the reference signal of initial re-selecting cell is large, and the difference of the reference signal power of the power of the reference signal of initial re-selecting cell and other all residential quarters is greater than the second predetermined threshold value, illustrate that described terminal is in the position of described initial re-selecting cell than the center, at this moment, as long as judge that by described step 204 the resource load state that obtains initial re-selecting cell is low load.If exist the difference of reference signal power of the power of reference signal of initial re-selecting cell and other all residential quarters less than the situation of the second predetermined threshold value, illustrate that then described terminal is at the edge of described initial re-selecting cell, at this moment, need to consider the problem of coordinating district interference.
If terminal is in the position of described initial re-selecting cell than the center, then the power of the initial gravity treatment that receives of the described terminal reference signal of going down is more much bigger than the reference signal power of other residential quarters, again because the threshold value of the RSRP of different frequency bands residential quarter is different, so described the second predetermined threshold value also needs the setting concrete according to actual conditions, can get the critical condition of terminal when being positioned at edge, residential quarter as the foundation of choosing the second predetermined threshold value, preferably, the value of described the second predetermined threshold value can be between 0dB-15dB.
Step 208: with described initial re-selecting cell as the target re-selecting cell.
Step 209: whether the edge resource load condition of judging described initial re-selecting cell according to described system information is low load, if, return step 208, if not, enter step 210.
When the edge of described terminal at described initial re-selecting cell, this moment is in order to overcome the problem of coordinating district interference, need to judge whether the edge resource load condition of described initial re-selecting cell is low load, if so, illustrate that then described terminal can carry out business and transmit in initial re-selecting cell.If the edge resource load condition of initial re-selecting cell is not low load, illustrate that then described terminal cannot be with described initial re-selecting cell as the target re-selecting cell, because this moment, do not have idling-resource for described terminal in the special-purpose sub-band of described initial re-selecting cell.
Step 210: the largest cell of from described candidate set, selecting the reference signal power maximum.
If initial re-selecting cell is not suitable as the target re-selecting cell, then can in being suitable as the candidate set of re-selecting cell, seek the residential quarter that is suitable as the target re-selecting cell.Here, at first select the residential quarter of reference signal power maximum, judge whether it is suitable as the target re-selecting cell.
Step 211: whether the edge resource load condition of judging described largest cell according to described system information is low load, if, with described largest cell as initial re-selecting cell, return step 209, if not, will except the candidate set of described largest cell as candidate set, return step 210.
What described step 210-step 211 reality was implemented is in candidate set, according to the descending order of the power of reference signal, whether the edge load of judging successively each residential quarter is low load, if in the deterministic process, whether the edge load occurred is the residential quarter of low load, then stop deterministic process, and with described residential quarter as the target re-selecting cell.
In actual environment, might exist all residential quarters in the candidate collection all to be not suitable as the situation of target re-selecting cell, at this moment, can wait until next cycle, carry out cell reselection next time, the reference signal that described terminal can receive alien-frequency district perhaps is set, when co-frequency cell all is not suitable as the target re-selecting cell, select target re-selecting cell in alien-frequency district.The process of select target re-selecting cell in alien-frequency district can be with reference to the cell reselection scheme of 36304 agreements of 3GPP regulation.In the technical scheme of present embodiment, except the beneficial effect that can realize embodiment 1, further, by the position of terminal in determining in the residential quarter, further reduced when terminal the probability of service disconnection has occured during in the cell edge position, and reached the purpose of coordinating district interference.
Accordingly, the invention provides a kind of terminal, with reference to shown in Figure 3, be the structural representation of a kind of terminal embodiment 1 provided by the invention, described terminal comprises:
Receiving element 301, for the reference signal that receives all residential quarters of candidate set, described candidate set comprises: former persistent district and a plurality of adjacent co-frequency cell;
The first selected cell 302 is used for the prominent reference signal of reference signal selection in all residential quarters of described candidate set;
The first judging unit 303 is used for judging that whether the power of prominent reference signal is greater than the first predetermined threshold value;
The first determining unit 304, the power that is used for prominent reference signal be during greater than the first predetermined threshold value, with the prominent residential quarter of downlink reference signal as initial re-selecting cell;
The second judging unit 305 is used for judging according to system information whether the resource load state of described initial re-selecting cell is low load;
The second determining unit 306, the resource load state that is used for described initial re-selecting cell be during for low load, with described initial re-selecting cell as the target re-selecting cell.
Preferably, described the second judging unit 305 specifically comprises:
The first judgment sub-unit is used for judging that whether the resource load of described initial re-selecting cell is less than the 3rd predetermined threshold value;
First determines subelement, and the result who is used for described the first judgment sub-unit determines that the resource load state of described initial re-selecting cell is for hanging down load when being.
With reference to shown in Figure 4, be the structural representation of a kind of terminal embodiment 2 provided by the invention, except described unit shown in Figure 3 is that described terminal also comprises:
The second selected cell 401, be used for select except the candidate set of described initial re-selecting cell reference signal power greater than all residential quarters of described the first predetermined threshold value as candidate set;
The 3rd judging unit 403 is used for judging whether described power difference converges exists the difference less than the second predetermined threshold value;
The 4th judging unit 404 when being used for described power difference converges and having difference less than the second predetermined threshold value, judges according to described system information whether the edge resource load condition of described initial re-selecting cell is low load;
Described the second determining unit 306 then, the edge resource load condition that specifically is used for described initial re-selecting cell be during for low load, with described initial re-selecting cell as the target re-selecting cell;
The 3rd selected cell 405 is used for from the largest cell of described candidate set selection reference signal power maximum;
The 5th judging unit 406 is used for judging according to described system information whether the edge resource load condition of described largest cell is low load;
Then described the second determining unit 306 specifically is used for, with described initial re-selecting cell as the target re-selecting cell;
Preferably, described the 4th judging unit 404 specifically comprises:
The second judgment sub-unit is used for judging that whether the edge resource load of described initial re-selecting cell is less than the 4th predetermined threshold value;
First determines subelement, and the result who is used for described the second judgment sub-unit determines that the edge resource load condition of described initial re-selecting cell is for hanging down load when being.
In the technical scheme of present embodiment, the terminal of idle condition is determined after the initial re-selecting cell, further judge the resource load situation of initial re-selecting cell, if the resource load situation is low load, the available free frequency resource of described initial re-selecting cell then is described, like this, when described terminal resident when this residential quarter, base station under the described initial re-selecting cell just can be dispatched the frequency resource of free time to described terminal and be used, when described like this terminal is initiated business in the target re-selecting cell of selecting, the probability that is forced to switch to other residential quarters will diminish, thereby has reduced the Service disruption ratio of terminal.
Further, in the position of residential quarter, further reduce the probability when terminal generation service disconnection during in the cell edge position by terminal in determining, and reached the purpose of coordinating district interference.
Need to prove, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.Do not having in the situation of more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
For system embodiment, because it corresponds essentially to embodiment of the method, so relevant part gets final product referring to the part explanation of embodiment of the method.System embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation of not paying creative work.
The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. LTE system small area reselecting method is characterized in that described method comprises:
The terminal of idle condition receives the reference signal of all residential quarters in the candidate set, and described candidate set comprises: former persistent district and a plurality of adjacent co-frequency cell;
The prominent reference signal of the reference signal selection of all residential quarters in described candidate set;
Whether judge the power of prominent reference signal greater than the first predetermined threshold value, if, then with the prominent residential quarter of downlink reference signal as initial re-selecting cell;
Judge that according to system information whether the resource load state of described initial re-selecting cell is low load, if, then with described initial re-selecting cell as the target re-selecting cell.
2. method according to claim 1 is characterized in that, described initial re-selecting cell as before the target re-selecting cell, is also comprised:
Will except select in the candidate set of described initial re-selecting cell reference signal power greater than all residential quarters of described the first predetermined threshold value as candidate set;
Calculate successively a plurality of differences of the received power of the reference signal of all residential quarters in the received power of reference signal of described initial re-selecting cell and the described candidate set, obtain power difference collection;
Judge whether described power difference converges exists the difference less than the second predetermined threshold value, if exist, then judge that according to described system information whether the edge resource load condition of described initial re-selecting cell is low load, if, then with described initial re-selecting cell as the target re-selecting cell.
3. method according to claim 2 is characterized in that, if the edge resource load condition of described initial re-selecting cell is not low load, described method also comprises:
From described candidate set, select the largest cell of reference signal power maximum;
Whether the edge resource load condition of judging described largest cell according to described system information is low load;
If, then with described largest cell as the target re-selecting cell;
If not, then will except the candidate set of described largest cell as candidate set, return the described step of from described candidate set, selecting the largest cell of reference signal power maximum.
4. method according to claim 1 is characterized in that, describedly judges that according to system information whether the resource load state of described initial re-selecting cell is low load, specifically comprises:
Whether judge the resource load of described initial re-selecting cell less than the 3rd predetermined threshold value, if determine that then the resource load state of described initial re-selecting cell is low load.
5. method according to claim 2 is characterized in that, describedly judges that according to described system information whether the edge resource load condition of described initial re-selecting cell is low load, specifically comprises:
Whether judge the edge resource load of described initial re-selecting cell less than the 4th predetermined threshold value, if determine that then the edge resource load condition of described initial re-selecting cell is low load.
6. a terminal is characterized in that, described terminal is in idle condition, and described terminal comprises:
Receiving element, for the reference signal that receives all residential quarters of candidate set, described candidate set comprises: former persistent district and a plurality of adjacent co-frequency cell;
The first selected cell is used for the prominent reference signal of reference signal selection in all residential quarters of described candidate set;
The first judging unit is used for judging that whether the power of prominent reference signal is greater than the first predetermined threshold value;
The first determining unit, the power that is used for prominent reference signal be during greater than the first predetermined threshold value, with the prominent residential quarter of downlink reference signal as initial re-selecting cell;
The second judging unit is used for judging according to system information whether the resource load state of described initial re-selecting cell is low load;
The second determining unit, the resource load state that is used for described initial re-selecting cell be during for low load, with described initial re-selecting cell as the target re-selecting cell.
7. terminal according to claim 6 is characterized in that, described terminal also comprises:
The second selected cell, be used for select except the candidate set of described initial re-selecting cell reference signal power greater than all residential quarters of described the first predetermined threshold value as candidate set;
The difference acquiring unit is used for calculating successively a plurality of differences of received power of the reference signal of the received power of reference signal of described initial re-selecting cell and all residential quarters of described candidate set, obtains power difference collection;
The 3rd judging unit is used for judging whether described power difference converges exists the difference less than the second predetermined threshold value;
The 4th judging unit when being used for described power difference converges and having difference less than the second predetermined threshold value, judges according to described system information whether the edge resource load condition of described initial re-selecting cell is low load;
Described the second determining unit then, the edge resource load condition that specifically is used for described initial re-selecting cell be during for low load, with described initial re-selecting cell as the target re-selecting cell.
8. terminal according to claim 7 is characterized in that, described terminal also comprises:
The 3rd selected cell is used for from the largest cell of described candidate set selection reference signal power maximum;
The 5th judging unit is used for judging according to described system information whether the edge resource load condition of described largest cell is low load;
Then described the second determining unit specifically is used for, with described initial re-selecting cell as the target re-selecting cell;
Trigger element, when the edge resource load condition that is used for described largest cell is not low load, will except the candidate set of described largest cell as candidate set, trigger described the 3rd selected cell.
9. terminal according to claim 6 is characterized in that, described the second judging unit specifically comprises:
The first judgment sub-unit is used for judging that whether the resource load of described initial re-selecting cell is less than the 3rd predetermined threshold value;
First determines subelement, and the result who is used for described the first judgment sub-unit determines that the resource load state of described initial re-selecting cell is for hanging down load when being.
10. terminal according to claim 7 is characterized in that, described the 4th judging unit specifically comprises:
The second judgment sub-unit is used for judging that whether the edge resource load of described initial re-selecting cell is less than the 4th predetermined threshold value;
First determines subelement, and the result who is used for described the second judgment sub-unit determines that the edge resource load condition of described initial re-selecting cell is for hanging down load when being.
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| CN103037458B (en) | 2015-07-15 |
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