CN101651887A - Method for determining target base station in switching process - Google Patents
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Abstract
The embodiment of the invention discloses a method for determining a target eNB in a switching process. The method comprises that: after receiving a switching request of a source eNB, an alternative target eNB feeds self real-time load information back to the source eNB; and the source eNB determines the target eNB from each alternative target eNB according to a measurement value in a measurementreport sent by UE and the load information, wherein the measurement value in the measurement report means a power value of a signal of the eNB received by the UE. The embodiment of the invention can comprehensively consider the measurement report sent by the UE and the current load condition of the alternative target eNB to determine the target eNB so as to ensure the communication quality betweenthe determined target eNB and the UE.
Description
Technical field
The present invention relates to the handoff technique of the communications field, relate in particular to a kind of method of in handoff procedure, determining target BS (eNB).
Background technology
(Uuser Equipment UE) can switch between each eNB subscriber equipment, to improve communication quality.UE consumed time when switching is called handover delay, and this handover delay is an important factor that influences communication quality.
(Long Term Evolution, LTE) in the system, source eNB comes select target eNB according to the measurement report from UE to existing Long Term Evolution.Measured value in the measurement report wherein refers to that UE receives the performance number of the signal of eNB, and this performance number is measured the performance number from the signal of each eNB by UE.Switch to example with present LTE system by X2 interface below and introduce handoff procedure.
The LTE system is divided into preparatory stage, execution phase and implementation phase by the handoff procedure of X2 interface, is introduced respectively below:
In the preparatory stage, source eNB sends handoff request (HORequest) message to the eNB that all satisfy the switch decision condition, when source eNB receive described all when satisfying the handoff request acknowledgment message (HO Request ACK) of the eNB of switch decision condition and/or handoff request failed message (HO Request failure), perhaps be timer T regularly of described preparatory stage
RELOCprepWhen overtime, the described preparatory stage finishes.
Fig. 1 is the flow chart of the preparatory stage of the handoff procedure that the LTE system passes through X2 interface in the prior art.As shown in Figure 1, this flow process comprises:
In this step, the measured value in the measurement report refers to the performance number of the signal of each eNB that UE receives.
In this step,, then return handoff request acknowledgment message, otherwise return the handoff request failed message if alternative target eNB admits this UE.
In handover execution stage, mainly carry out user's random access procedure and user face data before turn over journey.Execution phase is when receiving switching command message from source eNB from UE, to this UE to target eNB send switch when finishing (Handover Complete) message till.
Finishing the stage in switching, mainly be that notice MME carries out the destination node conversion of user's face tunnel, and notification source eNB carries out resource release.Switch the stage of finishing when target eNB is received Handover Complete message from UE, when source eNB receives the ReleaseResource message that target eNB sends till.
From above-mentioned handoff procedure as can be seen, in the preparatory stage of switching, source eNB determines that target eNB is based on measurement report, i.e. the signal power value of each eNB of UE reception.Generally speaking, employing comes the method for select target eNB can make UE obtain communication quality preferably according to measurement report, yet, if the relative load of selected target eNB is heavier, still after can can't guaranteeing that switching is finished because of selected eNB load is heavier, this eNB can well satisfy the communication quality of UE.
Based on the problems referred to above, propose in the prior art, increase the real-time load information that proprietary signaling is periodically transmitted between adjacent eNB, yet, because the real-time load information of each eNB is a cyclical transmission, source eNB does not have the current load state of each alternative eNB of real reflection at the load information of determining target eNB time institute foundation, still can't guarantee to switch finish after, this target eNB can well satisfy the communication quality of UE.
Summary of the invention
In view of this, the purpose of the embodiment of the invention is to provide a kind of method of determining target eNB in handoff procedure, and after guaranteeing that switching is finished, this target eNB can better meet the communication quality of UE.
For achieving the above object, the technical scheme of the embodiment of the invention specifically is achieved in that
A kind of method of in handoff procedure, determining target BS eNB, this method comprises:
After alternative target eNB receives the handoff request of source eNB, self real-time load information is returned to source eNB, the measured value in the measurement report that source eNB sends according to the real-time load information that receives and UE is determined target eNB from each alternative target eNB.
As seen, in the embodiment of the invention, after alternative target eNB receives the handoff request of source eNB, the real-time load information of self is returned to source eNB, source eNB is when determining target eNB, take all factors into consideration the described load information that measured value in the measurement report that UE sends and alternative target eNBs send, therefore in the time of can avoiding only coming select target eNB according to measurement report, selected target eNB load heavier and can't guarantee to switch finish after, the problem of the communication quality between this eNB and the UE, in addition, because being each alternative target eNB, described load information returns to source eNB after receiving the handoff request of source eNB, therefore source eNB the load information of determining target eNB time institute foundation can be real the current load state of each alternative eNB of reflection, thereby guarantee to switch finish after, this target eNB can better meet the communication quality of UE.
Description of drawings
Fig. 1 is the flow chart of the preparatory stage of the handoff procedure that the LTE system passes through X2 interface in the prior art;
Fig. 2 is the method flow diagram of determining target BS in handoff procedure that the inventive method embodiment provides.
Embodiment
Core concept of the present invention is, after alternative target eNB receives the handoff request of source eNB, the real-time load information of self is returned to source eNB, measured value in the measurement report that real-time load information that eNB basis in source receives and UE send, determine target eNB from each alternative target eNB, the measured value in the described measurement report comprises that UE receives the performance number of the signal of eNB.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Fig. 2 is the method flow diagram of determining target BS in handoff procedure that the inventive method embodiment provides, and as shown in Figure 2, this method comprises:
Step 201, source eNB receives the measurement report from UE.
In this step, the measured value in the measurement report is meant the performance number of the signal of each eNB that UE receives.
Step 202, source eNB makes switch decision according to the measured value in the measurement report, and selects alternative target eNB, sends handoff request to described alternative target eNB.
Usually, the number of the alternative target eNB that selects in this step is two or more.
Step 203, alternative target eNB returns to source eNB with the real-time load information of self, makes the judgement of whether admitting this UE according to described handoff request, and returns corresponding message.
In this step,, then return handoff request acknowledgment message, otherwise return the handoff request failed message if alternative target eNB admits this UE.
In this step, alternative target eNB can be carried at the real-time load information of self and return to source eNB in the existing signaling message, particularly: the handoff request of agreeing source eNB as alternative target eNB, when promptly agreeing to admit this UE, alternative target eNB is when source eNB returns handoff request acknowledgment message, self real-time load message is carried at returns to source eNB in the handoff request acknowledgment message.When alternative target eNB disagrees with the handoff request of source eNB, promptly disagree with when admitting this UE, also the real-time load message of self can be carried at and return to source eNB in the handoff request failed message, be used to realize real-time load information mutual between each eNB.
In this step, alternative target eNB also can be carried at the real-time load information of self the special signaling message that is used for transmitting this real-time load information and return to source eNB, at this moment, need newly-increased special signaling message to be used to transmit the real-time load information of alternative target eNB.
In this step, alternative target eNB is carried at self real-time load information to return to source eNB in the existing signaling message, still self real-time load information is carried at the special signaling message that is used for transmitting this real-time load information and returns to source eNB, be pre-configured when building communication system, therefore source eNB knows in advance when alternative target eNB returns the real-time load information of self, and which message this real-time load information is carried in.
In this step, if alternative target eNB is carried at self real-time load information and returns to source eNB in the existing signaling message, so, correspondingly, in step 201, source eNB also can be carried at the real-time load information of self and issue each alternative target eNB in the handoff request message, thereby is implemented under the prerequisite that does not additionally increase new proprietary signaling, realizes real-time load information mutual between each eNB.
Step 204, the measured value in the measurement report that source eNB sends according to UE is alternative target eNB divided rank.
Measured value in the measurement report that source eNB sends UE is pressed the thresholding classification, the measured value grade is high more, the grade of alternative target eNB that expression has this measured value is high more, and, think that each alternative target eNB with same levels is identical with communication quality between this UE.
Can think alternative target eNB with same levels identical with communication quality between this UE be because the alternative target eNB of same levels and the communication quality difference between the UE can be ignored.
The execution sequence of step 203 and step 204 is unrestricted.
Step 205, source eNB determines all the highest current grades eNB from all alternative target eNB.
In this step, the highest current grade is meant, the highest grade in the current grade that possesses separately of all alternative target eNB, for example, if the second level, the third level and the fourth stage (the more little grade of progression is high more) are arranged in the current grade that possesses separately of all alternative target eNB, then the second level is the highest current grade, and all the highest current grades eNB is meant, among all alternative target eNB, current grade is partial alternative target eNB.
Step 206, whether source eNB judges among described all the highest current grades eNB has part or all of eNB that the load information of self is returned to source eNB, if, execution in step 207, otherwise execution in step 208.
In this step, when alternative target eNB is carried at self real-time load information when returning to source eNB in the handoff request acknowledgment message, source eNB judges the real-time load information that whether contains this alternative eNB in this handoff request acknowledgment message, if, execution in step 207, otherwise execution in step 208.
When alternative target eNB was carried at self real-time load information the special signaling message that is used for transmitting this real-time load information and returns to source eNB, source eNB judged whether to receive this special signaling message, if, execution in step 207, otherwise execution in step 208.
By step 206, can realize existing eNB and have the compatibility that after receiving handoff request, real-time load information is returned to the eNB of source this function of eNB.
Step 207, according to described load information eNB that load is the lightest as the target eNB of determining, process ends.
Step 208, the eNB that selects the measured value maximum in the measurement report in described all the highest grades of grade eNB is as the target eNB of determining, process ends.
Because can think that alternative target eNB with same levels is identical with communication quality between the UE, therefore, in this step, also can be from described all the highest current grades eNB at random eNB of selection as selected target eNB.Yet; owing to still may there are differences between the measured value of same levels; and the alternative target eNB with relatively large measured value can have communication quality relatively preferably than the alternative target eNB with less relatively measured value usually; therefore; as the eNB that in the highest described grade eNB group, selects the measured value maximum in the measurement report during, can further guarantee the target eNB selected and the communication quality between the UE as selected target eNB.
As seen from the above technical solution, after alternative target eNB receives the handoff request of source eNB, the real-time load information of self is returned to source eNB, source eNB is when determining target eNB, take all factors into consideration the described load information that measured value in the measurement report that UE sends and alternative target eNB send, therefore in the time of can avoiding only coming select target eNB according to measurement report, selected target eNB load heavier and can't guarantee to switch finish after, the problem of the communication quality between this eNB and the UE, in addition, because being alternative target eNB, described load information returns to source eNB after receiving the handoff request of source eNB, therefore source eNB the load information of determining target eNB time institute foundation can be real the current load state of the alternative eNB of reflection, thereby after guaranteeing that switching is finished, this target eNB can satisfy the communication quality of UE.
If alternative target eNB is carried at self real-time load information and returns to source eNB in the existing signaling message, can also further save signaling consumption, thus conserve system resources.
When determining target eNB, by judging that whether alternative target eNB returns to source eNB with the real-time load information of self, can also realize existing eNB and have the compatibility that after receiving handoff request, real-time load information is returned to the eNB of source this function of eNB, thereby realize existing the determine method of target eNB and the compatibility that the embodiment of the invention provides the method for the eNB that sets the goal really.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of method of determining target BS eNB in handoff procedure is characterized in that this method comprises:
After alternative target eNB receives the handoff request of source eNB, self real-time load information is returned to source eNB, the measured value in the measurement report that source eNB sends according to the real-time load information that receives and UE is determined target eNB from each alternative target eNB.
2, the method for claim 1 is characterized in that, described definite target eNB comprises:
Source eNB is according to the size of the measured value in predetermined threshold range and the described measurement report, to have the alternative target eNB that is in the measured value in the same threshold range and be divided into same grade, and from each alternative target eNB, determine all the highest current grades eNB, in described all the highest current grades eNB, determine target eNB according to load information.
3, method as claimed in claim 2 is characterized in that, determines that according to load information target eNB comprises in described all the highest current grades eNB:
When all or part of eNB in judging all the highest current grades eNB returned to source eNB with self load information, eNB load is the lightest according to described load information was defined as target eNB.
4, method as claimed in claim 2 is characterized in that, determines that according to load information target eNB comprises in described all the highest current grades eNB:
When judging all the highest current grades eNB and all self load information is not returned to source eNB, in described the highest current grade eNB group, select the eNB of measured value maximum as target eNB.
As the described method of the arbitrary claim of claim 1 to 4, it is characterized in that 5, described real-time load information with self returns to source eNB and comprises:
When alternative eNB agrees described handoff request, self real-time load information is carried at returns to source eNB in the handoff request acknowledgment message.
6, method as claimed in claim 5 is characterized in that, described real-time load information with self returns to source eNB and further comprises:
When alternative eNB disagrees with described handoff request, self real-time load information is carried at returns to source eNB in the handoff request failed message.
7, method as claimed in claim 5 is characterized in that, alternative target eNB receives that the handoff request of source eNB further comprises before:
Source eNB is carried at self real-time load information and issues each alternative target eNB in the handoff request.
As the described method of the arbitrary claim of claim 1 to 4, it is characterized in that 8, described real-time load information with self returns to source eNB and comprises:
Self real-time load information is carried at the special signaling message that is used for transmitting this real-time load information returns to source eNB.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012003629A1 (en) * | 2010-07-06 | 2012-01-12 | 中兴通讯股份有限公司 | Carrier aggregation ca information transferring method and apparatus among base stations |
| CN103428796A (en) * | 2012-05-21 | 2013-12-04 | 普天信息技术研究院有限公司 | Method and device for determining target base station in switching process |
| CN104936163B (en) * | 2015-06-18 | 2018-10-30 | 西南交通大学 | A kind of dual link prothetic group station adding method, device and its base station |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103874148B (en) * | 2012-12-10 | 2017-07-07 | 中国电信股份有限公司 | Base station switch method, system and base station based on X2 interface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7454213B2 (en) * | 2002-11-08 | 2008-11-18 | Nokia Siemens Networks Oy | Traffic management in radio system |
| CN100596228C (en) * | 2006-01-10 | 2010-03-24 | 华为技术有限公司 | Method for terminal switching between heterogeneous network |
| CN101031132A (en) * | 2006-02-28 | 2007-09-05 | 华为技术有限公司 | Wireless resource management system and switch controlling method based on it |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012003629A1 (en) * | 2010-07-06 | 2012-01-12 | 中兴通讯股份有限公司 | Carrier aggregation ca information transferring method and apparatus among base stations |
| CN103428796A (en) * | 2012-05-21 | 2013-12-04 | 普天信息技术研究院有限公司 | Method and device for determining target base station in switching process |
| CN103428796B (en) * | 2012-05-21 | 2016-05-11 | 普天信息技术研究院有限公司 | In handoff procedure, determine method and the device of target BS |
| CN104936163B (en) * | 2015-06-18 | 2018-10-30 | 西南交通大学 | A kind of dual link prothetic group station adding method, device and its base station |
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