CN102065495A - Method, system and base station for selecting target cell - Google Patents
Method, system and base station for selecting target cell Download PDFInfo
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- CN102065495A CN102065495A CN2009102376403A CN200910237640A CN102065495A CN 102065495 A CN102065495 A CN 102065495A CN 2009102376403 A CN2009102376403 A CN 2009102376403A CN 200910237640 A CN200910237640 A CN 200910237640A CN 102065495 A CN102065495 A CN 102065495A
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Abstract
The invention discloses a method for selecting a target cell. The method comprises the following steps of: when a user terminal needs to switch a cell, selecting a preparation cell from candidate cells satisfying conditions by a base station, wherein the preparation cell is a cell determined according to the priority level of a frequency point and/or wireless access system, and the frequency point and/or wireless access system is the one meeting the service and capacity requirements of the current user terminal; and sending a switching request to the preparation cell, and determining the target cell according to the response information of the preparation cell to the switching request. The method can balance the cell loads of different access frequency point and/or wireless access systems and further improve the capacity of the whole wireless communication network.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to system and a kind of base station of a kind of method of selecting target cell, a kind of select target sub-district.
Background technology
In mobile communication system, user terminal (UE) is after initial Serving cell and network are realized being connected, because the link-quality mobile, current service cell of user in network worsens, the perhaps current service cell high reason of loading, for guaranteeing communication continuity, network often needs the user is switched to the another one sub-district, continues to provide service by the another one sub-district for this user terminal, and handover promptly takes place.In brief, handover is exactly to keep on the basis of continuity, and the connection of user terminal is switched to Target cell from former Serving cell.
The most key in the handover is the selection of Target cell, at present at LTE (I, ong time Evolution, Long Term Evolution) in the system, the selection of Target cell mainly is that network side is according to RSRP (the Reference Signal Receive Power of UE to Target cell, Reference Signal Received Power), perhaps RSRQ (Reference Signal Receive Quality, Reference Signal Received Quality) measurement result selects suitable Target cell for UE in conjunction with the neighboring BS relationship between current service cell and the Target cell; In the TD-SCDMA system, the selection of Target cell mainly is that network side is according to P-CCPCH RSCP (the Received Signal Code Power of UE to Target cell, received signal code power) measurement result selects suitable Target cell for UE in conjunction with the neighboring BS relationship between current service cell and the Target cell; Generally speaking, all directly UE is reported among RSRP, RSRQ or the P-CCPCH RSCP maximum corresponding district as the preferred object sub-district in the prior art.
Along with the development of mobile communication technology, current a plurality of access frequency points and/or a plurality of wireless access system of often being coated with in same zone for example, in certain sub-district, is coated with the gsm system of processed voice business, and, the LTE system of deal with data business.In this case, because frequency is high more, the wireless signal decline is big more, thereby adopt the prior art user terminal will preferentially select low frequency of frequency or wireless access system, thereby cause the cell load of indivedual access frequency points and/or wireless access system overweight, cause the unbalanced problem of cell load of different access frequency points and/or wireless access system.
Therefore, need the urgent technical problem that solves of those skilled in the art to be exactly at present: the mechanism that how can propose a kind of select target sub-district with innovating, so that the cell load equalizationization of different access frequency points and/or wireless access system, and then improve the capacity of whole cordless communication network.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of selecting target cell, device and a kind of base station, makes the cell load equalizationization of different access frequency points and/or wireless access system, and then improves the capacity of whole cordless communication network.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses a kind of method of selecting target cell, comprising:
When user terminal needs switching cell, the sub-district is selected to prepare in the base station from qualified candidate cell, described preparation sub-district is the sub-district of determining according to the priority of frequency and/or wireless access system, and described frequency and/or wireless access system are to satisfy the business of active user's terminal and the frequency and/or the wireless access system of ability need;
Described preparation sub-district is sent handoff request, and the response message of described handoff request is determined Target cell according to described preparation sub-district.
Preferably, the priority of described frequency and/or wireless access system obtains by following steps:
The Service Profile Identifier SPID that receives described user terminal from equipment of the core network according to the base station determines the priority of described frequency and/or wireless access system;
And/or,
Adopt the priority of described frequency of load balancing algorithm computation and/or wireless access system;
And/or,
According to the priority of described current service of user terminal demand, determine the priority of corresponding frequency and/or wireless access system;
And/or,
Determine the priority of described wireless access system according to the type of described wireless access system.
Preferably, described preparation sub-district is the highest candidate cell of priority of described frequency and/or wireless access system.
Preferably, described preparation sub-district is a plurality of, and the step of described definite Target cell comprises:
Described a plurality of preparations sub-district is sent handoff request simultaneously, comprise the business demand information of described user terminal in the described handoff request; Prepare the response message that comprises the admission service loaded state of sub-district feedback, selecting the maximum sub-district of admission service carrying quantity is Target cell according to each; Perhaps, prepare the response message that comprises the admission service loaded state of sub-district feedback, in the sub-district that can admit the service bearer that guarantees bit rate GBR, selecting the highest sub-district of described frequency and/or wireless access system priority is Target cell according to each.
Preferably, described preparation sub-district is a plurality of, and the step of described definite Target cell comprises:
Current preparation sub-district is sent handoff request, comprise the business demand information of described user terminal in the described handoff request;
Current preparation sub-district judges whether to admit all business or the partial service of described user terminal, if determine that then current preparation sub-district is a Target cell; Otherwise, the next one is prepared the sub-district returns described handoff request forwarding step as current preparation sub-district.
Preferably, described candidate cell is the sub-district that the base station is determined the measurement report of Serving cell and neighboring cell signal quality according to user terminal.
Preferably, described preparation sub-district is in a plurality of candidate cells of choosing from high to low according to described frequency and/or wireless access system priority, further carries out the sub-district of extracting after the descending sort according to measurement report.
Preferably, described method also comprises:
If to before preparing sub-district transmission handoff request, receive new measurement report, then upgrade described candidate cell;
At the candidate cell of described renewal, determine to prepare the sub-district according to the priority of described frequency and/or wireless access system.
The embodiment of the invention also discloses the device of a kind of select target sub-district, comprising:
Prepare the sub-district and choose module, be used for when user terminal needs switching cell, from qualified candidate cell, select to prepare the sub-district, described preparation sub-district is the sub-district of determining according to the priority of frequency and/or wireless access system, and described frequency and/or wireless access system are to satisfy the business of active user's terminal and the frequency and/or the wireless access system of ability need;
The Target cell determination module is used for described preparation sub-district is sent handoff request, and according to described preparation sub-district the response message of described handoff request is determined Target cell.
Preferably, the priority of described frequency and/or wireless access system is to receive the definite priority of Service Profile Identifier SPID of described user terminal from equipment of the core network according to the base station;
And/or,
The priority of described frequency and/or wireless access system is to adopt the priority of load balancing algorithm computation;
And/or,
The priority of described frequency and/or wireless access system is, according to the definite corresponding priority of the priority of described current service of user terminal demand;
And/or,
The priority of described wireless access system is, according to the definite priority of the type of described wireless access system.
Preferably, described preparation sub-district is the highest candidate cell of priority of described frequency and/or wireless access system.
Preferably, described preparation sub-district is a plurality of, and described Target cell determination module comprises:
Parallel request submodule is used for described a plurality of preparations sub-district is sent handoff request simultaneously, comprises the business demand information of described user terminal in the described handoff request;
First target is determined submodule, is used for preparing the response message that comprises the admission service loaded state of sub-district feedback according to each, and selecting the maximum sub-district of admission service carrying quantity is Target cell; Perhaps, be used for preparing the response message that comprises the admission service loaded state of sub-district feedback according to each, in the sub-district that can admit the service bearer that guarantees bit rate GBR, selecting the highest sub-district of described frequency and/or wireless access system priority is Target cell.。
Preferably, described preparation sub-district is a plurality of, and described Target cell determination module comprises:
Serial request submodule is used for current preparation sub-district is sent handoff request, comprises the business demand information of described user terminal in the described handoff request;
Second target is determined submodule, is used for all business or partial service that current preparation sub-district judges whether to admit described user terminal, if determine that then current preparation sub-district is a Target cell; Otherwise, the next one is prepared the sub-district returns described serial request submodule as current preparation sub-district.
Preferably, described candidate cell is the sub-district that the base station is determined the measurement report of Serving cell and neighboring cell signal quality according to user terminal.
Preferably, described preparation sub-district is in a plurality of candidate cells of choosing from high to low according to described frequency and/or wireless access system priority, further carries out the sub-district of extracting after the descending sort according to measurement report.
Preferably, described device also comprises:
The candidate cell update module is used for when receiving new measurement report, upgrading described candidate cell to before preparing sub-district transmission handoff request;
Prepare the cell update module, be used for candidate cell, determine to prepare the sub-district according to the priority of described frequency and/or wireless access system at described renewal.
The embodiment of the invention also discloses a kind of base station, described base station is used for when user terminal needs switching cell, is the user terminal selecting Target cell, and described base station comprises:
Prepare the sub-district and choose the unit, be used for selecting to prepare the sub-district from qualified candidate cell, described preparation sub-district is the sub-district of determining according to the priority of frequency and/or wireless access system, and described frequency and/or wireless access system are to satisfy the business of active user's terminal and the frequency and/or the wireless access system of ability need;
The Target cell determining unit is used for described preparation sub-district is sent handoff request, and according to described preparation sub-district the response message of described handoff request is determined Target cell.
Compared with prior art, the present invention has the following advantages:
The present invention is directed to the situation that is coated with a plurality of access frequency points and/or a plurality of wireless access systems in the reality in the same zone, when Target cell is selected, except that the admittance situation of the measurement result of user terminal, Target cell, further consider the difference of frequency and/or wireless access system, be specially by the priority of each frequency that presets and/or wireless access system and from candidate cell, determine to prepare the sub-district, determine the final objective sub-district according to the admittance situation of preparing the sub-district then.Thereby avoided in the prior art, user terminal is always preferentially selected the problem of low frequency of frequency or wireless access system, efficient balance the cell load of different access frequency points and/or wireless access system, make full use of each frequency and/or wireless access system and handle the advantage of dissimilar teleservices, and, help to improve the capacity of whole cordless communication network.
Moreover the strategy of the configuration preferred combination operator of described frequency and/or wireless access system priority is provided with, and can make things convenient for operator to take the distribution of user terminal in diversified operation policy-flexible ground each frequency of control and/or the wireless access system.
Description of drawings
Fig. 1 is the flow chart of steps of a kind of method of selecting target cell embodiment of the present invention;
Fig. 2 is the communication flow diagram of the concrete example 1 of a kind of select target of the present invention sub-district;
Fig. 3 is the communication flow diagram of the concrete example 2 of a kind of select target of the present invention sub-district;
Fig. 4 is the structured flowchart of the device embodiment of a kind of select target of the present invention sub-district.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to figure 1, show the flow chart of steps of a kind of method of selecting target cell embodiment of the present invention, specifically can comprise:
Wherein, described preparation sub-district is the sub-district of determining according to the priority of frequency and/or wireless access system, and described frequency and/or wireless access system are to satisfy the business of active user's terminal and the frequency and/or the wireless access system of ability need;
In specific implementation, the base station can be determined candidate cell according to user terminal to the measurement report of Serving cell and neighboring cell signal quality.For example, for the sub-district of LTE system, measurement be RSRP or RSRQ; For the sub-district of TD-SCDMA system, measurement be P-CCPCH RSCP, according to described measurement report determine candidate cell scheme can for:
Scheme 1, with all sub-districts of comprising in the measurement report all as candidate cell;
For example, UE1 comprises sub-district 1, sub-district 2 constantly 1 having sent measurement report in the measurement report, and receive behind the measurement report sub-district 1 and sub-district 2 all as candidate cell the base station.
Whether the measurement result of scheme 2, the sub-district judging in the measurement report to be comprised greater than absolute door limit value TH, if, then be chosen as candidate cell, if not, then not as candidate cell.
For example, UE1 comprises sub-district 1, sub-district 21 having sent measurement report constantly in the measurement report, and wherein the RSRP value of sub-district 1 then is not chosen as candidate cell less than default TH, and the RSRP value of sub-district 2 then is chosen as candidate cell greater than default TH.
Certainly, the scheme of above-mentioned definite candidate cell is only as example, and it all is feasible that the art technology philtrum adopts any implementation of the prior art according to actual conditions, and the present invention need not this to be limited.
In a preferred embodiment of the present invention, the process that the sub-district is prepared in described selection specifically can comprise with next stage substep S11-S13:
Substep S11, select the business that satisfies active user's terminal and the frequency and/or the wireless access system of ability need;
This step can be understood as and filter out the first step of preparing the sub-district from candidate cell, promptly requires the frequency of candidate cell and/or wireless access system to meet the following conditions:
Condition 1: can support the business demand that UE is current;
Condition 2: be frequency and/or the wireless access system that the UE ability can be supported;
For described condition 1, network side can obtain the business information that candidate cell is supported in advance, and judges whether candidate cell can support all business of UE, if then include this sub-district in the preparation cell set; Otherwise do not select this sub-district (in screening process, getting rid of this sub-district).
As another kind of implementation, after network side obtains business information that candidate cell supports in advance, can judge whether the business that to support that UE is all earlier, if then include this sub-district in the preparation cell set; Otherwise, further judge whether to support the partial service of UE, if then this sub-district is included the preparation cell set in; If all business are not supported, then do not select this sub-district.
For described condition 2, when the initial connection of UE is set up, network side can be known the ability information of UE, the ability information of UE specifically can show, whether can support E-UTRA, GERAN, UTRA and CDMA2000-1xRTT etc., frequency and/or wireless access system under network based described UE ability information and the candidate cell are judged, if the support of UE ability is included this sub-district in the preparation cell set; Otherwise, do not select this sub-district.
For example, for a UE who only supports the LTE system,, then do not select this sub-district if there is the sub-district of UTRA in the candidate cell.
Substep S12, determine the priority of each frequency and/or wireless access system;
In specific implementation, described priority can be determined by following factor:
Factor 1, terminal capability and current business information;
Factor 2, according to the pre-pre-configured priority of carrier policy;
For example, for speech business, the priority of gsm system is higher; For data service, the priority of LTE system is higher.
Factor 3, the priority relevant with user signing contract information;
For example, the base station receives the SPID of UE from equipment of the core network.
The priority that factor 4, Access Network are determined according to certain policy in resource management.
For example, the priority that provides according to the load balancing algorithm, perhaps, the dissimilar pairing priority of wireless access system etc.
For making those skilled in the art understand the present invention better, the example that below provides a frequency and/or wireless access system priority to determine specifically can comprise following secondary substep S21-S24:
Substep S21, if the base station receives the SPID of current UE from equipment of the core network, then according to the corresponding priority of determining above-mentioned frequency of selecting and/or wireless access system of the priority of SPID;
Be well known that SPID is a parameter relevant with the UE CAMEL-Subscription-Information,, promptly can be used to determine the priority of frequency and/or wireless access system directly according to the priority of indicating among the SPID.
Substep S22If, through after the above-mentioned steps, have identical frequency of priority and/or wireless access system, then further determine priority according to the load balancing algorithm.
With the LTE system is example, if each sub-district only comprises a frequency, determines that then the process of priority relates to following three grades of substep S31-S34:
The load of each sub-district of subordinate is periodically added up in substep S31, base station, and reports the operational administrative module;
To adopt resource utilization to assess load is example, the base station is based on the resource utilization of each sub-district of statistics, the resource utilization of a plurality of sub-districts under the same frequency is averaged, obtain the resource utilization of each frequency under this base station, and periodically report operational administrative module (managing the operational administrative module of whole wireless access system concentratedly).If subordinate sub-district, this base station belongs to same frequency, then the resource utilization with all sub-districts averages.In the connecting system of reality, the base station can directly report this operational administrative module of concentrating, and perhaps reports the operational administrative module of the whole connecting system of centralized management by certain regional operational administrative module.Described resource utilization can be for taking all factors into consideration the resource utilization of uplink and downlink.For example, a kind of account form is shown in following formula:
The PRB number that the PRB number/uplink and downlink of the actual utilization that resource utilization=uplink and downlink are total are total.
Substep S32, operational administrative module calculate the stressor of each frequency according to the load value that receives, and obtain the priority of each frequency under this connecting system, wherein, stressor can for greater than 0 less than 1 numerical value.
Particularly, for each frequency, the resource utilization of the frequency under each base station that the operational administrative module will be received averages, and obtains the resource utilization of this frequency.Obtain stressor according to resource utilization.For example resource utilization is 50%, and then stressor is 0.5.Based on the stressor that obtains frequency is carried out prioritization, stressor is big more, and priority is low more.
Substep S33, operational administrative module are calculated the stressor of this system;
Specifically can for example adopt following formula to calculate according to the stressor of the stressor computing system of all frequencies:
L wherein
SystemBe the system loading factor, B
iBe the bandwidth of i frequency, L
iIt is the stressor of i frequency;
Certainly, because the characteristic difference of each connecting system, the method difference of the calculated load factor only shows a kind of example of LTE system-computed method above, and those skilled in the art adopt corresponding calculation method to get final product at different connecting systems.
Substep S34, each connecting system stressor is sorted, obtain the prioritization of connecting system.
Particularly, the operational administrative module of each connecting system can obtain the stressor of other connecting systems by mutual stressor.Perhaps, if there is operational administrative module more higher leveled, that can manage each connecting system concentratedly, then each connecting system reports stressor, after the operational administrative module of managing each system concentratedly sorts, notifies each connecting system with priority.
In this example, according to stressor system priority is sorted, stressor is big more, and priority is low more.
Substep S23, through after the load balancing of the above-mentioned substep S22 ordering, if still have identical frequency of priority and/or wireless access system,, further determine the priority of corresponding frequency and/or wireless access system then according to the priority of UE current business demand;
For example, suppose that current UE need handle two business, be respectively speech business and ftp downloading service, then the business of limit priority is speech business, candidate cell belongs to LTE system and UMTS system respectively, because the system priority of speech business correspondence is GSM＞UMTS＞LTE, so preferentially select the sub-district of UMTS system.
Substep S24, if other RAT priority of priority and some of service RAT (wireless access system) is identical, then will serve RAT priority and be adjusted to and be higher than other RAT priority.
In embodiments of the present invention, the benefit of preferential selection service RAT is to reduce the handoff time delay, and the handoff time delay between system is greater than intrasystem handoff time delay.For example, be the UE of LTE system cell for the cell-of-origin, when candidate cell existed LTE system cell and UMTS system cell simultaneously, the sub-district of preferentially selecting the LTE system was a Target cell.
Certainly, above-mentioned Determination of priority scheme is only as example, and those skilled in the art adopt the combination of above-mentioned each step or several steps according to actual conditions, and, the processing sequence of transposing above-mentioned steps adopts other priority to determine that mode all is feasible, for example; Substep S22 and S23 are exchanged, pay the utmost attention to the priority that load balancing provides, consider the SPID parameter again; Perhaps, if having the frequency and the wireless access system of equal priority, then further according to measurement report etc., the present invention need not this to be limited.
Substep S13, from described preparation collection sub-district, select the highest sub-district of frequency and/or wireless access system priority for preparing the sub-district.
If obtain a plurality of preparations sub-district, in a preferred embodiment of the present invention, the step 102 of described definite Target cell may further include following substep:
Substep T41, described a plurality of preparations sub-district is sent handoff request simultaneously, comprise the business demand information of described user terminal in the described handoff request;
Substep T42, prepare the response message that comprises the admission service loaded state of sub-district feedback, selecting the maximum sub-district of admission service carrying quantity is Target cell according to each.
As another kind of implementation, above-mentioned substep T42 also can for, prepare the response message that comprises the admission service loaded state of sub-district feedback according to each, in the sub-district that can admit the service bearer that guarantees bit rate GBR, selecting the highest sub-district of described frequency and/or wireless access system priority is Target cell.For making those skilled in the art understand the present invention better, below be that example illustrates present embodiment with the LTE system.
With reference to figure 2, in the LTE system, when the base station (not shown) judges that according to the measurement report of UE user's needs are when switch the cell-of-origin, one or more preparation cell set can be selected for the user according to measurement report in the base station, be specifically as follows the candidate cell that reports at UE and determine the priority of frequency and/or wireless access system according to correlation technique above, the line ordering of going forward side by side, to result's (for example size of RSRP or the RSRQ) descending sort of the sub-district that belongs to same priority, suppose that the result of current ordering is as shown in the table then according to measurement report:
| System | Frequency | The sub-district |
| The LTE system | ||
| Frequency 1 | ||
| Sub-district 2 | ||
| Sub-district 5 | ||
| Frequency 2 | ||
| Sub-district 3 | ||
| The TD-SCDMA system | ||
| Sub-district 4 | ||
| Sub-district 6 |
Wherein, frequency 1 and frequency 2 all belong to the frequency of LTE system; The magnitude relationship of supposing the RSRP value of acquisition reporting of user is: 2＞sub-district, sub-district 5; The magnitude relationship of the P-CCPCH RSCP value of reporting of user is: 4＞sub-district, sub-district 6.
In this example, select 2 the most forward sub-districts of ordering as preparing the sub-district, i.e. sub-district 2 and sub-district 5, promptly among Fig. 2 shown in to prepare sub-district 1 be sub-district 2, preparation sub-district 2 is sub-district 5.The base station sends handoff request message to these two selected preparation sub-districts simultaneously, promptly carrying out real switching (being connected of UE disconnection and cell-of-origin, insert Target cell) before, asks a plurality of preparations sub-district to prepare resource for this UE.Receive after the response of these two preparation sub-districts, after receiving the response of preparing the sub-district, if prepare the service bearer that sub-district 1 only can receiving portion, can admit whole service bearers and prepare sub-district 2, then can adopt following two kinds of methods to select the final objective sub-district:
Method 1: select the maximum sub-district of admission service carrying number as Target cell, for example select to prepare sub-district 2 as Target cell;
Method 2: as long as can admit all GBR (Guaranteed Bit Rate guarantees bit rate) carrying, then preferential the selection according to the forward sub-district of measurement result ordering.For example, can admit all GBR carryings, select to prepare sub-district 1 as Target cell if prepare sub-district 1.
Certainly, only as example, the present invention does not limit this yet in the system of selection of above-mentioned Target cell.
In practice, after Target cell is determined, the cell-of-origin can send switching command to UE, to carry out real switching, promptly disconnect the cell-of-origin, insert Target cell, in this process, also can carry out a known synchronizing process, after finishing synchronously, promptly finish the operation that switches to Target cell from the cell-of-origin.
As another preferred embodiment, determine that in a plurality of preparations sub-district the process of Target cell can also realize by following substep:
Substep T21, current preparation sub-district is sent handoff request, comprise the business demand information of described user terminal in the described handoff request;
All business or partial service that substep T22, current preparation sub-district judge whether to admit described user terminal are if determine that then current preparation sub-district is a Target cell; Otherwise, the next one is prepared the sub-district returns described handoff request forwarding step as current preparation sub-district.
For making those skilled in the art understand the present invention better, below present embodiment is described by another example.With reference to figure 3, this example specifically can may further comprise the steps:
Steps A 1, UE send measurement report;
Steps A 2, cell-of-origin are selected to prepare the sub-district, are specifically related to:
Candidate cell is selected after receiving measurement report in the cell-of-origin, according to the frequency of determining and/or the priority of wireless access system candidate cell is sorted, choose a plurality of candidate cells that meet when precondition from high to low according to frequency/system priority, further descending sort is carried out in the sub-district then, select the most forward sub-district of queuing for preparing the sub-district according to measurement result.For example, suppose that 3 preparations of current needs sub-district is, the frequency of limit priority has only 2 sub-districts, then prepares the sub-district except that comprising pairing 2 sub-districts of this limit priority frequency, also comprises last time 1 the most previous sub-district of ordering of high priority frequency correspondence.
In specific implementation, new measurement report may also can be received in the cell-of-origin before sending switching command, in this case, when receiving new measurement report, all can upgrade the candidate cell tabulation that has existed.The tabulation of candidate cell after the renewal is still sorted according to frequency and/or wireless access system priority and measurement result.
Described renewal principle is specifically as follows:
Principle 1: the sub-district for not having in the candidate cell before comprising in the new measurement report then judges whether to add candidate cell to.
Principle 2: for the sub-district that exists in the candidate cell before comprising in the new measurement report, then judge whether still to satisfy the condition of candidate cell,, then be not re-used as candidate cell if do not satisfy according to measurement report;
Principle 3: if the frequency under the sub-district of new measurement report is identical with the frequency of existing part candidate cell, judge then whether the sub-district that belongs to this frequency in the existing candidate cell all is present in new measurement report, for certain sub-district, if be present in existing candidate cell tabulation, belong to this frequency, but be not present in the new measurement report, then deletion from the candidate cell tabulation.
Steps A 3, cell-of-origin send handoff request to preparing the sub-district one by one, ask current preparation sub-district to prepare resource;
In handoff request message, carried the business information of UE, after Target cell is received handoff request, this UE has been carried out whether admissible judgement of business, and reply response message according to judged result.
Steps A 4, cell-of-origin judge whether and can switch according to response message;
Specifically can adopt following method:
Method 1: if Target cell can be admitted all business, then send switching command, switch to this Target cell.If can not admit all business of this UE, then continue the select target sub-district, selection principle sends handoff request with above-mentioned steps A 2.If all candidate cells all can not be admitted all business of this UE, then temporarily do not switch.
Method 2:, then switch to this sub-district if Target cell can be admitted the partial service of this UE.Otherwise continue the select target sub-district and send handoff request.If all candidate cells all can not be admitted any one business of this UE, then temporarily do not switch.
Steps A 5, cell-of-origin send switching command to UE, and UE initiates access procedure to Target cell after receiving switching command.
Need to prove, for aforesaid each method embodiment, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
With reference to figure 4, show the structured flowchart of the device embodiment of a kind of select target of the present invention sub-district, specifically can comprise with lower module:
Prepare the sub-district and choose module 41, be used for when user terminal needs switching cell, from qualified candidate cell, select to prepare the sub-district, described preparation sub-district is the sub-district of determining according to the priority of frequency and/or wireless access system, and described frequency and/or wireless access system are to satisfy the business of active user's terminal and the frequency and/or the wireless access system of ability need;
Target cell determination module 42 is used for described preparation sub-district is sent handoff request, and according to described preparation sub-district the response message of described handoff request is determined Target cell.
In embodiments of the present invention preferably, the priority of described frequency and/or wireless access system is to receive the definite priority of Service Profile Identifier SPID of described user terminal from equipment of the core network according to the base station;
And/or the priority of described frequency and/or wireless access system is to adopt the priority of load balancing algorithm computation;
And/or the priority of described frequency and/or wireless access system is, according to the definite corresponding priority of the priority of described current service of user terminal demand;
And/or the priority of described wireless access system is, according to the definite priority of the type of described wireless access system.
Wherein, described preparation sub-district is the highest candidate cell of priority of described frequency and/or wireless access system.
In specific implementation, the sub-district that described candidate cell can be determined the measurement report of Serving cell and neighboring cell signal quality according to user terminal for the base station; In this case, described preparation sub-district can be in a plurality of candidate cells of choosing from high to low according to described frequency and/or wireless access system priority, further carry out the sub-district of extracting after the descending sort according to measurement report.
Generally speaking, described preparation sub-district has a plurality of, and in this case, described Target cell determination module can comprise following submodule:
Parallel request submodule is used for described a plurality of preparations sub-district is sent handoff request simultaneously, comprises the business demand information of described user terminal in the described handoff request;
First target is determined submodule, is used for preparing the response message that comprises the admission service loaded state of sub-district feedback according to each, select admission service carrying quantity at most or the admission service carrying guarantee that the highest sub-district of bit rate GBR is a Target cell; Perhaps, be used for preparing the response message that comprises the admission service loaded state of sub-district feedback according to each, in the sub-district that can admit the service bearer that guarantees bit rate GBR, selecting the highest sub-district of described frequency and/or wireless access system priority is Target cell.。
As another kind of implementation, described Target cell determination module also can comprise following submodule:
Serial request submodule is used for current preparation sub-district is sent handoff request, comprises the business demand information of described user terminal in the described handoff request;
Second target is determined submodule, is used for all business or partial service that current preparation sub-district judges whether to admit described user terminal, if determine that then current preparation sub-district is a Target cell; Otherwise, the next one is prepared the sub-district returns described serial request submodule as current preparation sub-district.
In practice, new measurement report may also can be received in the cell-of-origin before sending switching command, and in this case, the embodiment of the invention can also comprise with lower module:
The candidate cell update module is used for when receiving new measurement report, upgrading described candidate cell to before preparing sub-district transmission handoff request;
Prepare the cell update module, be used for candidate cell, determine to prepare the sub-district according to the priority of described frequency and/or wireless access system at described renewal.
The device of select target of the present invention sub-district specifically can be arranged in the base station.
Because present embodiment is substantially corresponding to preceding method embodiment, so not detailed part in the description of present embodiment can just not given unnecessary details at this referring to the related description in the previous embodiment.
Need to prove that the present invention can describe, for example program module in the general context of the computer executable instructions of being carried out by computer.Usually, program module comprises the routine carrying out particular task or realize particular abstract, program, object, assembly, data structure or the like.Also can in distributed computing environment (DCE), put into practice the present invention, in these distributed computing environment (DCE), by by communication network connected teleprocessing equipment execute the task.In distributed computing environment (DCE), program module can be arranged in the local and remote computer-readable storage medium that comprises memory device.
In addition, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises " or its any other variant is intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits 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.
More than device and a kind of base station of a kind of method of selecting target cell provided by the present invention, a kind of select target sub-district is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (17)
1. a method of selecting target cell is characterized in that, comprising:
When user terminal needs switching cell, the sub-district is selected to prepare in the base station from qualified candidate cell, described preparation sub-district is the sub-district of determining according to the priority of frequency and/or wireless access system, and described frequency and/or wireless access system are to satisfy the business of active user's terminal and the frequency and/or the wireless access system of ability need;
Described preparation sub-district is sent handoff request, and the response message of described handoff request is determined Target cell according to described preparation sub-district.
2. the method for claim 1 is characterized in that, the priority of described frequency and/or wireless access system obtains by following steps:
The Service Profile Identifier SPID that receives described user terminal from equipment of the core network according to the base station determines the priority of described frequency and/or wireless access system;
And/or,
Adopt the priority of described frequency of load balancing algorithm computation and/or wireless access system;
And/or,
According to the priority of described current service of user terminal demand, determine the priority of corresponding frequency and/or wireless access system;
And/or,
Determine the priority of described wireless access system according to the type of described wireless access system.
3. method as claimed in claim 2 is characterized in that, described preparation sub-district is the highest candidate cell of priority of described frequency and/or wireless access system.
4. as claim 1,2 or 3 described methods, it is characterized in that described preparation sub-district is a plurality of, the step of described definite Target cell comprises:
Described a plurality of preparations sub-district is sent handoff request simultaneously, comprise the business demand information of described user terminal in the described handoff request; Prepare the response message that comprises the admission service loaded state of sub-district feedback, selecting the maximum sub-district of admission service carrying quantity is Target cell according to each; Perhaps, prepare the response message that comprises the admission service loaded state of sub-district feedback, in the sub-district that can admit the service bearer that guarantees bit rate GBR, selecting the highest sub-district of described frequency and/or wireless access system priority is Target cell according to each.
5. as claim 1,2 or 3 described methods, it is characterized in that described preparation sub-district is a plurality of, the step of described definite Target cell comprises:
Current preparation sub-district is sent handoff request, comprise the business demand information of described user terminal in the described handoff request;
Current preparation sub-district judges whether to admit all business or the partial service of described user terminal, if determine that then current preparation sub-district is a Target cell; Otherwise, the next one is prepared the sub-district returns described handoff request forwarding step as current preparation sub-district.
6. the method for claim 1 is characterized in that, described candidate cell is the sub-district that the base station is determined the measurement report of Serving cell and neighboring cell signal quality according to user terminal.
7. method as claimed in claim 6 is characterized in that, described preparation sub-district is in a plurality of candidate cells of choosing from high to low according to described frequency and/or wireless access system priority, further carries out the sub-district of extracting after the descending sort according to measurement report.
8. method as claimed in claim 6 is characterized in that, also comprises:
If to before preparing sub-district transmission handoff request, receive new measurement report, then upgrade described candidate cell;
At the candidate cell of described renewal, determine to prepare the sub-district according to the priority of described frequency and/or wireless access system.
9. the device of a select target sub-district is characterized in that, comprising:
Prepare the sub-district and choose module, be used for when user terminal needs switching cell, from qualified candidate cell, select to prepare the sub-district, described preparation sub-district is the sub-district of determining according to the priority of frequency and/or wireless access system, and described frequency and/or wireless access system are to satisfy the business of active user's terminal and the frequency and/or the wireless access system of ability need;
The Target cell determination module is used for described preparation sub-district is sent handoff request, and according to described preparation sub-district the response message of described handoff request is determined Target cell.
10. device as claimed in claim 9 is characterized in that, the priority of described frequency and/or wireless access system is to receive the definite priority of Service Profile Identifier SPID of described user terminal from equipment of the core network according to the base station;
And/or,
The priority of described frequency and/or wireless access system is to adopt the priority of load balancing algorithm computation;
And/or,
The priority of described frequency and/or wireless access system is, according to the definite corresponding priority of the priority of described current service of user terminal demand;
And/or,
The priority of described wireless access system is, according to the definite priority of the type of described wireless access system.
11. device as claimed in claim 9 is characterized in that, described preparation sub-district is the highest candidate cell of priority of described frequency and/or wireless access system.
12., it is characterized in that described preparation sub-district is a plurality of as claim 9,10 or 11 described devices, described Target cell determination module comprises:
Parallel request submodule is used for described a plurality of preparations sub-district is sent handoff request simultaneously, comprises the business demand information of described user terminal in the described handoff request;
First target is determined submodule, is used for preparing the response message that comprises the admission service loaded state of sub-district feedback according to each, and selecting the maximum sub-district of admission service carrying quantity is Target cell; Perhaps, be used for preparing the response message that comprises the admission service loaded state of sub-district feedback according to each, in the sub-district that can admit the service bearer that guarantees bit rate GBR, selecting the highest sub-district of described frequency and/or wireless access system priority is Target cell.。
13., it is characterized in that described preparation sub-district is a plurality of as claim 9,10 or 11 described devices, described Target cell determination module comprises:
Serial request submodule is used for current preparation sub-district is sent handoff request, comprises the business demand information of described user terminal in the described handoff request;
Second target is determined submodule, is used for all business or partial service that current preparation sub-district judges whether to admit described user terminal, if determine that then current preparation sub-district is a Target cell; Otherwise, the next one is prepared the sub-district returns described serial request submodule as current preparation sub-district.
14. device as claimed in claim 9 is characterized in that, described candidate cell is the sub-district that the base station is determined the measurement report of Serving cell and neighboring cell signal quality according to user terminal.
15. device as claimed in claim 14 is characterized in that, described preparation sub-district is in a plurality of candidate cells of choosing from high to low according to described frequency and/or wireless access system priority, further carries out the sub-district of extracting after the descending sort according to measurement report.
16. device as claimed in claim 14 is characterized in that, also comprises:
The candidate cell update module is used for when receiving new measurement report, upgrading described candidate cell to before preparing sub-district transmission handoff request;
Prepare the cell update module, be used for candidate cell, determine to prepare the sub-district according to the priority of described frequency and/or wireless access system at described renewal.
17. a base station is characterized in that described base station is used for when user terminal needs switching cell, is the user terminal selecting Target cell, described base station comprises:
Prepare the sub-district and choose the unit, be used for selecting to prepare the sub-district from qualified candidate cell, described preparation sub-district is the sub-district of determining according to the priority of frequency and/or wireless access system, and described frequency and/or wireless access system are to satisfy the business of active user's terminal and the frequency and/or the wireless access system of ability need;
The Target cell determining unit is used for described preparation sub-district is sent handoff request, and according to described preparation sub-district the response message of described handoff request is determined Target cell.
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Application publication date: 20110518 |