CN103037458B - 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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- CN103037458B CN103037458B CN201210524474.7A CN201210524474A CN103037458B CN 103037458 B CN103037458 B CN 103037458B CN 201210524474 A CN201210524474 A CN 201210524474A CN 103037458 B CN103037458 B CN 103037458B
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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 small area reselecting method and terminal.
Background technology
At LTE(Long Term Evolution, Long Term Evolution) in mobile communications network, the terminal after start has two states: connection status and idle condition.When terminal has business to transmit, described terminal is in connection status, namely there is wireless link between terminal and one of them community of certain base station in LTE mobile communication network and is connected.In other situations, terminal is in idle condition, the community that described terminal can go selection one suitable according to cell reselection criterion, and by the cell report of selection to network, this is called as the gravity treatment of community.
When terminal carries out cell reselection between multiple co-frequency cell, in existing residence reselecting, terminal is according to the cell reselection criterion select target re-selecting cell of presetting, be specially: terminal measures the RSRP(Reference Signal Received Power of former persistent district and adjacent co-frequency cell, Reference Signal Received Power), described RSRP is applicable to terminal in community higher than representing during a thresholding resident (to show that community is applicable to terminal resident in instruction here, but whether terminal can reside in this community, also need to judge whether this community meets resident condition); Then, described terminal selects community that RSRP value is the highest as target re-selecting cell in multiple co-frequency cells of RSRP value higher than described thresholding.
In described prior art, when terminal carries out cell reselection, only consider the RSRP of each co-frequency cell.The problem brought like this is, if the target re-selecting cell that described terminal is selected can be resident, when described terminal has business to transmit, if now the resource of target re-selecting cell is more nervous, described terminal is probably switched to the lower community of other resource load by base station requests after connecting with target re-selecting cell.And switching has certain probability of failure, disconnecting or the traffic delay of described terminal and target re-selecting cell may be caused.
Summary of the invention
The invention provides a kind of LTE system small area reselecting method and terminal, to solve in prior art, because re-selecting cell resource load is nervous, the technical problem of the terminal caused and the disconnecting of re-selecting cell or traffic delay, reduce the Service disruption ratio of terminal, improve Consumer's Experience.
For solving the problems of the technologies described above, the invention provides a kind of LTE system small area reselecting method and terminal, the invention provides following technical scheme:
A kind of LTE system small area reselecting method and terminal, the method comprises:
The terminal of idle condition receives the reference signal of all communities in candidate set, and described candidate set comprises: former persistent district and multiple adjacent co-frequency cell;
The prominent reference signal of the reference signal selection of all communities in described candidate set;
Judge whether the power of prominent reference signal is greater than the first predetermined threshold value, if so, then using prominent for downlink reference signal community as initial re-selecting cell;
Whether the resource load state judging described initial re-selecting cell according to system information is low load, if so, then using described initial re-selecting cell as target re-selecting cell.
Preferably, using described initial re-selecting cell as before target re-selecting cell, also comprise:
By all communities alternatively set of cells selecting reference signal power to be greater than described first predetermined threshold value in the candidate set except described initial re-selecting cell;
Calculate multiple differences of the received power of the reference signal of all communities in the received power of the reference signal of described initial re-selecting cell and described candidate set successively, obtain power difference collection;
Judge that described power difference concentrates the difference whether existing and be less than the second predetermined threshold value, if exist, then judge whether the edge resource load condition of described initial re-selecting cell is low load according to described system information, if so, then using described initial re-selecting cell as 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:
The largest cell selecting reference signal power maximum from described candidate set;
Whether the edge resource load condition judging described largest cell according to described system information is low load;
If so, then using described largest cell as target re-selecting cell;
If not, then by the alternatively set of cells of the candidate set except described largest cell, return the step of the described largest cell selecting reference signal power maximum from described candidate set;
Preferably, describedly judge whether the resource load state of described initial re-selecting cell is low load, specifically comprises according to system information:
Judge whether the resource load of described initial re-selecting cell is less than the 3rd predetermined threshold value, if so, then determine that the resource load state of described initial re-selecting cell is low load.
Preferably, describedly judge whether the edge resource load condition of described initial re-selecting cell is low load, specifically comprises according to described system information:
Judge whether the edge resource load of described initial re-selecting cell is less than the 4th predetermined threshold value, if so, then determine that the edge resource load condition of described initial re-selecting cell is low load.
The embodiment of the present invention provides a kind of terminal, and described terminal is in idle condition, and described terminal comprises:
Receiving element, for receiving the reference signal of all communities in candidate set, described candidate set comprises: former persistent district and multiple adjacent co-frequency cell;
First selected cell, for the prominent reference signal of reference signal selection of communities all in described candidate set;
First judging unit, for judging whether the power of prominent reference signal is greater than the first predetermined threshold value;
First determining unit, when the power for prominent reference signal is greater than the first predetermined threshold value, using prominent for downlink reference signal community as initial re-selecting cell;
Second judging unit, for judging according to system information whether the resource load state of described initial re-selecting cell is low load;
Second determining unit, when the resource load state for described initial re-selecting cell is low load, using described initial re-selecting cell as target re-selecting cell.
Preferably, described terminal also comprises:
Second selected cell, for all communities alternatively set of cells selecting reference signal power to be greater than described first predetermined threshold value in the candidate set except described initial re-selecting cell;
Difference acquiring unit, for calculating multiple differences of the received power of the reference signal of all communities in the received power of the reference signal of described initial re-selecting cell and described candidate set successively, obtains power difference collection;
3rd judging unit, for judging that described power difference concentrates the difference whether existing and be less than the second predetermined threshold value;
4th judging unit, when concentrating existence to be less than the difference of the second predetermined threshold value for described power difference, judges according to described system information whether the edge resource load condition of described initial re-selecting cell is low load;
Then described second determining unit, when the edge resource load condition specifically for described initial re-selecting cell is low load, using described initial re-selecting cell as target re-selecting cell.
Preferably, described terminal also comprises:
3rd selected cell, for the largest cell selecting reference signal power maximum from described candidate set;
5th judging unit, for judging according to described system information whether the edge resource load condition of described largest cell is low load;
Then described second determining unit, specifically for, using described initial re-selecting cell as target re-selecting cell;
Trigger element, when the edge resource load condition for described largest cell is not low load, by the alternatively set of cells of the candidate set except described largest cell, triggers described 3rd selected cell.
Preferably, described second judging unit specifically comprises:
First judgment sub-unit, for judging whether the resource load of described initial re-selecting cell is less than the 3rd predetermined threshold value;
First determines subelement, during for the result of described first judgment sub-unit for being, determines that the resource load state of described initial re-selecting cell is low load.
Preferably, described 4th judging unit specifically comprises:
Second judgment sub-unit, for judging whether the edge resource load of described initial re-selecting cell is less than the 4th predetermined threshold value;
First determines subelement, during for the result of described second judgment sub-unit for being, determines that the edge resource load condition of described initial re-selecting cell is low load.
In technical scheme of the present invention, after the terminal of idle condition determines initial re-selecting cell, the resource load situation of the initial re-selecting cell of further judgement, if resource load situation is low load, the frequency resource that described initial re-selecting cell is available free is then described, like this, when described terminal resident to this community time, the frequency resource of free time just can be dispatched and be used to described terminal by the base station belonging to described initial re-selecting cell, when described like this terminal initiates business in the target re-selecting cell selected, the probability being forced to be switched to other communities will diminish, thus reduce the Service disruption ratio of terminal.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of a kind of LTE system small area of the present invention reselecting method embodiment 1;
Fig. 2 is the flow chart of a kind of LTE system small area of the present invention reselecting method embodiment 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
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Shown in figure 1, be the flow chart of a kind of LTE system small area provided by the invention reselecting method embodiment 1, the present embodiment specifically can comprise:
Step 101: the terminal of idle condition receives the reference signal of all communities in candidate set.
In the present embodiment, candidate set can comprise: former persistent district and multiple adjacent co-frequency cell.In practical communication environment, operator can use multiple different frequency band.For a concrete community, one of them frequency band can only be used.Use multiple communities of identical frequency band to be called as co-frequency cell, these communities are nonoverlapping, with the formal distribution tiled.In addition, former persistent district refers to the last resident community of terminal of this idle condition.
The terminal of idle condition, periodically receive the reference signal of the neighbor cell of former persistent district and described former persistent district, a terminal specifically can receive the reference signal of which community, is specifically arranged by network side.In fact, described terminal can receive former persistent district, the adjacent co-frequency cell of former persistent district, the reference signal of adjacent alien-frequency district, the candidate set that the present embodiment arranges terminal for network side comprises former persistent district and multiple adjacent co-frequency cell, for the reference signal of alien-frequency district, be not considered here.
Step 102: the prominent reference signal of the reference signal selection of all communities in described candidate set.
When described terminal receives the reference signal of the adjacent co-frequency cell of former persistent district and described former persistent district, described terminal will select a prominent reference signal in described former persistent district and multiple homogeneous frequency adjacent area.
Step 103: judge whether the power of prominent reference signal is greater than the first predetermined threshold value, if so, then enters step 104.
If the power of described prominent reference signal is greater than the first predetermined threshold value, illustrates that community corresponding to described prominent reference signal is suitable as re-selecting cell, community corresponding for maximum reference signal is designated as initial re-selecting cell here.Described 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-70dBm to-22dBm.If the power of prominent reference signal is not more than the first predetermined threshold value, then all communities in candidate set are all not suitable for the re-selecting cell of doing described terminal.
Step 104: whether the resource load state judging described initial re-selecting cell according to system information is low load, if so, then enters step 105.
The physical layer of LTE system is based on orthogonal frequency division multiplexi, so almost without any interference between each terminal in same community, interference is mainly from the terminal of the adjacent co-frequency cell of cell edge.In order to reduce the appearance of interference, the Radio Resource used the terminal being in adjacent edge, co-frequency cell is needed to do some restrictions, Here it is coordinating district interference.The method for cell interference coordination more generally adopted at present is soft-frequency reuse technology.The main feature of this technology is: in the whole frequency band that community uses, mark off a special sub-band, cell-edge terminals can only use the resource of this special sub-band to carry out business transmission, and the band resource that center of housing estate terminal can use whole community all carries out business transmission.And be do not occur simultaneously between the sub-band that adjacent co-frequency cell is marked separately, the terminal this ensures that thering adjacent edge, co-frequency cell can not use identical sub-carrier resources to carry out business transmission, just reaches the object of evading interference.
So base station needs resource load situation and the cell edge resource load situation of community in its coverage of periodic statistical, i.e. a period of time subdistrict frequency band resources occupation rate and the special sub-band resources occupation rate of cell edge, if occupancy is high load condition after exceeding some thresholdings.Wherein subdistrict frequency band resources occupation rate and the special sub-band resources occupation rate of cell edge can adopt same thresholding to be high or low to identify its load.Base station by the report the test of above-mentioned periodic statistical to webmaster, webmaster is according to the belonging relation of cell neighboring relations and community and base station, regular sends to relevant base station by above-mentioned statistics, for described terminal, after the statistics that the adjacent co-frequency cell own base station that webmaster receives the former persistent district of described terminal reports, the resource load information of adjacent co-frequency cell will be upgraded in system information, and by system information broadcast to the terminal of idle pulley, described like this terminal just can judge the loading condition of each co-frequency cell by the system information received.
When practical operation, can adopt and realize in such a way, for each cell definitions two parameters: local resource overload mark (Resource Over load), cell edge resource overload mark (EdgeResource Over load), two parameter values are all Boolean types.When community in a period of time whole band resource occupancy higher (such as higher than 90%), area resource overload mark value is true (true), otherwise value is false (false).When the sub-band resources occupation rate that Cell Edge User in a period of time is special higher (such as higher than 90%), cell edge resource overload mark value is true, otherwise is false.Can these two parameters be added to system information block 4(System InformationBlock4) and system information block 5(System Information Block5) in cell list each community information in.
Step 105: using described initial re-selecting cell as target re-selecting cell.
When the resource load state identifying described initial re-selecting cell in system information is low, resident target re-selecting cell then illustrates that there is idling-resource in described initial re-selecting cell can use, so can be treated as the terminal of final idle condition in described initial re-selecting cell by described terminal.Like this, if described terminal is resident carry out business transmission to described target re-selecting cell, the possibility being forced to be switched to other community can diminish, and the possibility that business transmission occurs to interrupt also can diminish.
In the technical scheme of the present embodiment, after the terminal of idle condition determines initial re-selecting cell, the resource load situation of the initial re-selecting cell of further judgement, if resource load situation is low load, the frequency resource that described initial re-selecting cell is available free is then described, like this, when described terminal resident to this community time, the frequency resource of free time just can be dispatched and be used to described terminal by the base station belonging to described initial re-selecting cell, when described like this terminal initiates business in the target re-selecting cell selected, the probability being forced to be switched to other communities will diminish, thus reduce the Service disruption ratio of terminal.
Although the object reducing terminal traffic interruption rate can be reached by the technical scheme of embodiment 1, in the technical scheme of embodiment, do not consider the actual position in the cell of described terminal.When terminal is positioned at the demarcation line of multiple community, when 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 so belonging to target re-selecting cell in the frequency band except special sub-band.In this case, described terminal can carry out business transmission, but can cause the interference between co-frequency cell.
When considering interference coordination, even if the resource load state of initial re-selecting cell is low load, but described terminal can only use the special 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 is likely high capacity, like this, described terminal then cannot carry out business transmission.In order to the technical problem that the technical scheme overcoming embodiment 1 may be brought.Shown in figure 2, be the flow chart of a kind of LTE system small area provided by the invention reselecting method embodiment 2, the present embodiment specifically can comprise:
Step 201: the terminal of idle condition receives the reference signal of all communities in candidate set.
Step 202: the prominent reference signal of the reference signal selection of all communities in described candidate set.
Step 203: judge whether the power of prominent reference signal is greater than the first predetermined threshold value, if so, then community corresponding for maximum reference signal is designated as initial re-selecting cell, enters step 204.
Step 204: whether the resource load state judging initial re-selecting cell according to system information is low load, if so, then enters step 205.
The implementation of described step 201-step 204 can the implementation of step 101-step 104 in reference example 1, repeats no more herein.
Step 205: by all communities alternatively set of cells selecting reference signal power to be greater than described first predetermined threshold value in the candidate set except described initial re-selecting cell.
The community that described initial re-selecting cell and reference signal power are less than described first predetermined threshold value is removed, by community remaining in candidate set alternatively set of cells in described candidate set.Wherein remove the community that reference signal power is less than described first predetermined threshold value and be the community removed and be not suitable as re-selecting cell.
Step 206: the multiple differences calculating the received power of the reference signal of all communities in the received power of the reference signal of described initial re-selecting cell and described candidate set successively, obtain power difference collection.
Described step 206 be calculate each community in the reference signal power of initial re-selecting cell and candidate set reference signal power between difference, the multiple differences obtained are formed at random a set, and are designated as difference collection.
Step 207: judge that described power difference concentrates the difference whether existing and be less than the second predetermined threshold value, if do not exist, then enter step 208, if exist, then enters step 209.
The object of described step 207 to determine the position of described terminal in initial re-selecting cell, if the power of the reference signal of other all communities of power ratio of the reference signal of initial re-selecting cell is large, and initially the power of reference signal of re-selecting cell and the difference of the reference signal power of other all communities are greater than the second predetermined threshold value, illustrate that described terminal is in the position of described initial re-selecting cell compared with center, at this moment, as long as judge that the resource load state obtaining initial re-selecting cell is low load by described step 204.If the difference that there is the power of the reference signal of initial re-selecting cell and the reference signal power of other all communities is less than the situation of the second predetermined threshold value, the edge of described terminal in described initial re-selecting cell is then described, now, the problem considering coordinating district interference is needed.
If terminal is in the position of described initial re-selecting cell compared with center, the power of the reference signal that the initial gravity treatment that then described terminal receives down is more much bigger than the reference signal power of other communities, again because the threshold value of the RSRP of different frequency bands community is different, so described second predetermined threshold value also needs the setting concrete according to actual conditions, critical condition when terminal is positioned at most edge, community can be got as the foundation choosing the second predetermined threshold value, preferably, the value of described second predetermined threshold value can between 0dB-15dB.
Step 208: using described initial re-selecting cell as target re-selecting cell.
Step 209: whether the edge resource load condition judging described initial re-selecting cell according to described system information is low load, if so, returns step 208, if not, enters step 210.
When described terminal is when the edge of described initial re-selecting cell, now in order to overcome the problem of coordinating district interference, need whether the edge resource load condition judging described initial re-selecting cell is low load, if so, then illustrate that described terminal can carry out business transmission in initial re-selecting cell.If the edge resource load condition of initial re-selecting cell is not low load, then illustrate that described terminal cannot using described initial re-selecting cell as target re-selecting cell, because there is no idling-resource for described terminal in the special sub-band of now, described initial re-selecting cell.
Step 210: the largest cell selecting reference signal power maximum from described candidate set.
If initial re-selecting cell is not suitable as target re-selecting cell, then can find the community being suitable as target re-selecting cell in the candidate set being suitable as re-selecting cell.Here, first select the community that reference signal power is maximum, judge whether it is suitable as target re-selecting cell.
Step 211: whether the edge resource load condition judging described largest cell according to described system information is low load, if, using described largest cell as initial re-selecting cell, return step 209, if not, by the alternatively set of cells of the candidate set except described largest cell, return step 210.
What described step 210-step 211 reality was implemented is in candidate set, according to the order that the power of reference signal is descending, whether the edge load judging each community is successively low load, if in deterministic process, occur that whether edge load is the community of low load, then stop deterministic process, and using described community as target re-selecting cell.
In actual environment, the all communities likely existed in candidate collection are all not suitable as the situation of target re-selecting cell, at this moment, next cycle can be waited until, carry out cell reselection next time, or the reference signal that described terminal can receive alien-frequency district is set, when co-frequency cell is all not suitable as 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, the cell reselection scheme that can specify with reference to 36304 agreements of 3GPP.In the technical scheme of the present embodiment, except can realizing the beneficial effect of embodiment 1, further, by determining the position of middle terminal in community, further reduce the probability that service disconnection occurs when terminal is in cell edge position, and reach the object of coordinating district interference.
Accordingly, the invention provides a kind of terminal, 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 receiving the reference signal of all communities in candidate set, described candidate set comprises: former persistent district and multiple adjacent co-frequency cell;
First selected cell 302, for the prominent reference signal of reference signal selection of communities all in described candidate set;
First judging unit 303, for judging whether the power of prominent reference signal is greater than the first predetermined threshold value;
First determining unit 304, when the power for prominent reference signal is greater than the first predetermined threshold value, using prominent for downlink reference signal community as initial re-selecting cell;
Second judging unit 305, for judging according to system information whether the resource load state of described initial re-selecting cell is low load;
Second determining unit 306, when the resource load state for described initial re-selecting cell is low load, using described initial re-selecting cell as target re-selecting cell.
Preferably, described second judging unit 305 specifically comprises:
First judgment sub-unit, for judging whether the resource load of described initial re-selecting cell is less than the 3rd predetermined threshold value;
First determines subelement, during for the result of described first judgment sub-unit for being, determines that the resource load state of described initial re-selecting cell is low load.
Shown in figure 4, be the structural representation of a kind of terminal embodiment 2 provided by the invention, except the unit shown in described Fig. 3 is that described terminal also comprises:
Second selected cell 401, for all communities alternatively set of cells selecting reference signal power to be greater than described first predetermined threshold value in the candidate set except described initial re-selecting cell;
Difference acquiring unit 402, for calculating multiple differences of the received power of the reference signal of all communities in the received power of the reference signal of described initial re-selecting cell and described candidate set successively, obtains power difference collection;
3rd judging unit 403, for judging that described power difference concentrates the difference whether existing and be less than the second predetermined threshold value;
4th judging unit 404, when concentrating existence to be less than the difference of the second predetermined threshold value for described power difference, judges according to described system information whether the edge resource load condition of described initial re-selecting cell is low load;
Then described second determining unit 306, when the edge resource load condition specifically for described initial re-selecting cell is low load, using described initial re-selecting cell as target re-selecting cell;
3rd selected cell 405, for the largest cell selecting reference signal power maximum from described candidate set;
5th judging unit 406, for judging according to described system information whether the edge resource load condition of described largest cell is low load;
Then described second determining unit 306, specifically for, using described initial re-selecting cell as target re-selecting cell;
Trigger element 407, when the edge resource load condition for described largest cell is not low load, by the alternatively set of cells of the candidate set except described largest cell, triggers described 3rd selected cell.
Preferably, described 4th judging unit 404 specifically comprises:
Second judgment sub-unit, for judging whether the edge resource load of described initial re-selecting cell is less than the 4th predetermined threshold value;
First determines subelement, during for the result of described second judgment sub-unit for being, determines that the edge resource load condition of described initial re-selecting cell is low load.
In the technical scheme of the present embodiment, after the terminal of idle condition determines initial re-selecting cell, the resource load situation of the initial re-selecting cell of further judgement, if resource load situation is low load, the frequency resource that described initial re-selecting cell is available free is then described, like this, when described terminal resident to this community time, the frequency resource of free time just can be dispatched and be used to described terminal by the base station belonging to described initial re-selecting cell, when described like this terminal initiates business in the target re-selecting cell selected, the probability being forced to be switched to other communities will diminish, thus reduce the Service disruption ratio of terminal.
Further, by determining the position of middle terminal in community, further reducing the probability that service disconnection occurs when terminal is in cell edge position, and reaching the object of coordinating district interference.
It should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
For system embodiment, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.System embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles 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 (8)
1. a LTE system small area reselecting method, is characterized in that, described method comprises:
The terminal of idle condition receives the reference signal of all communities in candidate set, and described candidate set comprises: former persistent district and multiple adjacent co-frequency cell;
The prominent reference signal of the reference signal selection of all communities in described candidate set;
Judge whether the power of prominent reference signal is greater than the first predetermined threshold value, if so, then using prominent for downlink reference signal community as initial re-selecting cell;
Whether the resource load state judging described initial re-selecting cell according to system information is low load, if so, all communities alternatively set of cells will reference signal power being selected in the candidate set except described initial re-selecting cell to be greater than described first predetermined threshold value;
Calculate multiple differences of the received power of the reference signal of all communities in the received power of the reference signal of described initial re-selecting cell and described candidate set successively, obtain power difference collection;
Judge that described power difference concentrates the difference whether existing and be less than the second predetermined threshold value, if exist, then judge whether the edge resource load condition of described initial re-selecting cell is low load according to described system information, if so, then using described initial re-selecting cell as target re-selecting cell.
2. method according to claim 1, is characterized in that, if the edge resource load condition of described initial re-selecting cell is not low load, described method also comprises:
The largest cell selecting reference signal power maximum from described candidate set;
Whether the edge resource load condition judging described largest cell according to described system information is low load;
If so, then using described largest cell as target re-selecting cell;
If not, then by the alternatively set of cells of the candidate set except described largest cell, return the step of the described largest cell selecting reference signal power maximum from described candidate set.
3. method according to claim 1, is characterized in that, describedly judges whether the resource load state of described initial re-selecting cell is low load, specifically comprises according to system information:
Judge whether the resource load of described initial re-selecting cell is less than the 3rd predetermined threshold value, if so, then determine that the resource load state of described initial re-selecting cell is low load.
4. method according to claim 1, is characterized in that, describedly judges whether the edge resource load condition of described initial re-selecting cell is low load, specifically comprises according to described system information:
Judge whether the edge resource load of described initial re-selecting cell is less than the 4th predetermined threshold value, if so, then determine that the edge resource load condition of described initial re-selecting cell is low load.
5. a terminal, is characterized in that, described terminal is in idle condition, and described terminal comprises:
Receiving element, for receiving the reference signal of all communities in candidate set, described candidate set comprises: former persistent district and multiple adjacent co-frequency cell;
First selected cell, for the prominent reference signal of reference signal selection of communities all in described candidate set;
First judging unit, for judging whether the power of prominent reference signal is greater than the first predetermined threshold value;
First determining unit, when the power for prominent reference signal is greater than the first predetermined threshold value, using prominent for downlink reference signal community as initial re-selecting cell;
Second judging unit, for judging according to system information whether the resource load state of described initial re-selecting cell is low load;
Second selected cell, for when the resource load state of initial re-selecting cell is low load, selects reference signal power to be greater than all communities alternatively set of cells of described first predetermined threshold value in the candidate set except described initial re-selecting cell;
Difference acquiring unit, for calculating multiple differences of the received power of the reference signal of all communities in the received power of the reference signal of described initial re-selecting cell and described candidate set successively, obtains power difference collection;
3rd judging unit, for judging that described power difference concentrates the difference whether existing and be less than the second predetermined threshold value;
4th judging unit, when concentrating existence to be less than the difference of the second predetermined threshold value for described power difference, judges according to described system information whether the edge resource load condition of described initial re-selecting cell is low load;
Second determining unit, when the edge resource load condition specifically for described initial re-selecting cell is low load, using described initial re-selecting cell as target re-selecting cell.
6. terminal according to claim 5, is characterized in that, described terminal also comprises:
3rd selected cell, for the largest cell selecting reference signal power maximum from described candidate set;
5th judging unit, for judging according to described system information whether the edge resource load condition of described largest cell is low load;
Then described second determining unit, specifically for, using described initial re-selecting cell as target re-selecting cell;
Trigger element, when the edge resource load condition for described largest cell is not low load, by the alternatively set of cells of the candidate set except described largest cell, triggers described 3rd selected cell.
7. terminal according to claim 5, is characterized in that, described second judging unit specifically comprises:
First judgment sub-unit, for judging whether the resource load of described initial re-selecting cell is less than the 3rd predetermined threshold value;
First determines subelement, during for the result of described first judgment sub-unit for being, determines that the resource load state of described initial re-selecting cell is low load.
8. terminal according to claim 5, is characterized in that, described 4th judging unit specifically comprises:
Second judgment sub-unit, for judging whether the edge resource load of described initial re-selecting cell is less than the 4th predetermined threshold value;
First determines subelement, during for the result of described second judgment sub-unit for being, determines that the edge resource load condition of described initial re-selecting cell is low load.
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| CN103945466B (en) * | 2014-04-02 | 2018-09-28 | 京信通信系统（中国）有限公司 | A kind of method and apparatus of determining handover candidate cells set |
| EP3616438B1 (en) * | 2017-04-28 | 2023-11-29 | Apple Inc. | Cell selection techniques for directional communications |
| CN107959941B (en) * | 2017-11-30 | 2020-11-17 | Oppo广东移动通信有限公司 | Detection method and device, storage medium |
| CN112867081B (en) * | 2020-12-31 | 2022-11-15 | 京信网络系统股份有限公司 | RRC state switching method, device, medium and base station |
| CN115278789A (en) * | 2021-04-30 | 2022-11-01 | 华为技术有限公司 | Communication processing method, communication device and communication system |
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| CN101420699A (en) * | 2008-12-03 | 2009-04-29 | 华为技术有限公司 | Control method, apparatus and base station for same station adjacent cell interference |
| CN102325353A (en) * | 2011-07-15 | 2012-01-18 | 大唐移动通信设备有限公司 | Method, equipment and system for selecting target cell during handover |
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| CN102325353A (en) * | 2011-07-15 | 2012-01-18 | 大唐移动通信设备有限公司 | Method, equipment and system for selecting target cell during handover |
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