CN101534536B

CN101534536B - Method for indicating switch reasons

Info

Publication number: CN101534536B
Application number: CN200810086705A
Authority: CN
Inventors: 高音; 费腾
Original assignee: ZTE Corp
Priority date: 2008-03-13
Filing date: 2008-03-13
Publication date: 2012-09-05
Anticipated expiration: 2028-03-13
Also published as: CN101534536A

Abstract

The invention discloses a method for indicating switch reasons, which comprises the following steps: a source base station sends an X2 switch request message carrying a switch reason message to a target base station, wherein the switch reason information comprises any one of the following information and the combination thereof: overload direction information and overload degree information; the target base station carries out the switch acceptance treatment according to the switch reason information in the X2 switch request message. With the adoption of the invention, base stations can carry out correct acceptance and management according to detailed overload reasons, thus improving the switch efficiency.

Description

Method for indicating switch reasons

Technical field

The present invention relates to the communications field, particularly, relate to method for indicating switch reasons based on Long Term Evolution (Long-TermEvolution abbreviates LTE as) system.

Background technology

Describe among the 36300-800; The LTE network is by E-UTRAN (Evolved UMTSTerrestrial Radio Access Network; The evolution UMTS Terrestrial radio access network), the Node B of base station, evolution (Evolved NodeB; Abbreviate eNB as) and evolution packet switching center (Evolved Packet Core abbreviates EPC as) composition, the network configuration flattening.

Wherein, E-UTRAN comprises the set of the eNB that is connected through the S1 interface with EPC, can connect through X2 interface between the eNB.S1, X2 are logic interfacing.An EPC can manage one or more eNB, and an eNB also can be controlled by a plurality of EPC, and simultaneously, an eNB can manage one or more sub-districts.

At present; In 3GPP 36.423 agreements; Initiate X2 between eNB when switching when the terminal, source base station can send handoff request message to target BS, to understand the initiation reason of current switching by target BS (this initiation reason can be used for the acceptance judging information of terminal at Target cell in order to make; Also can be used as the subsequent feedback information of load balancing strategy); And make things convenient for test maintaining, and can in handoff request message, carry the initiation cause information, reason can comprise that normal switching, wireless quality are poor, load balancing, overload etc.

Former thereby the speech for overload because the load of place, current terminal Serving cell is too high, although the terminal still can reside in current service cell, switches to the load that other sub-districts can alleviate current service cell undoubtedly with the terminal, improves network performance.

In the handoff technique that adopts the overload reason only is provided at present, still, overload situations can have multiple, and therefore, under many circumstances, the base station only is difficult to carry out correct admittance management based on the overload reason, and can not guarantee switching efficiency.Therefore, need a kind of technical scheme that can address the above problem.

Summary of the invention

Consider a kind of terminal of the needs that exist in the correlation technique (User Equipment; Be called for short UE) when between the base station, carrying out the X2 switching; The base station only proposes the present invention according to the problem that the overload reason is difficult to carry out correct admittance management; For this reason, the present invention aims to provide a kind of method for indicating switch reasons, in order to address the above problem.

To achieve these goals, according to the present invention, a kind of method for indicating switch reasons is provided.

Method for indicating switch reasons according to the embodiment of the invention comprises: source base station sends X2 handoff request message to target BS; And in X2 handoff request message, carry switch reasons information; Wherein, switch reasons information comprises following any and combination: overload directional information, overload degree information; Target BS switches admission processing according to the switch reasons information in the X2 handoff request message.

Wherein, the overload directional information be following any: up overload, descending overload.

Wherein, overload degree thresholding is set in advance, and the overload degree information is set based on the overload messages of portable terminal and overload degree thresholding, wherein, the overload degree information comprise following any: light overload, heavy overload.

Further; Target BS feeds back handoff request acknowledgment message to source base station; Carry in the handoff request acknowledgment message under the situation of admitting the failure business information in feedback, admitting the failure business information is following any or its combination: overload directional information, overload degree information.

Perhaps; Further; Target BS switches to source base station feedback prepares failed message, and prepares failure information switching to prepare to carry in the failed message to switch, and switches that to prepare failure information be following any or its combination: overload directional information, overload degree information.

Through technique scheme provided by the invention; Through carry out indicating concrete overload reason when X2 switches at UE; Solved that the base station only is difficult to carry out correct admittance management according to current overload reason in the correlation technique, and can not guarantee the problem of switching efficiency, realized switching accuracy of reception decision and reasonability; And strengthen load balancing strategy validity, and information more accurately is provided for test maintaining.

Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become apparent, perhaps understand by embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the flow chart according to the method for indicating switch reasons of the embodiment of the invention;

Fig. 2 is the Signalling exchange flow chart of method shown in Figure 1.

Embodiment

Table 1 shows the X2 switch reasons message structure according to correlation technique.As shown in table 1, under the current handoff request in the 3GPP36.423 agreement, the wireless network layer reason of representing with enumeration type in the switch reasons message structure has following several kinds: urgent switching, load balancing, overload that normal switching, wireless quality difference cause.

Table 1

The cell title	There is situation	IE type and reference information
			Select the reason group	M
-＞wireless network layer
			-＞＞wireless network layer reason	?M	Enumeration type (the normal switchable load that the wireless quality difference causes is balanced for Unspecified, the normal switching, overload ...)
-＞transport layer	M
			-＞agreement	M
-＞mix	M

As stated, for example, between the base station, carry out in the X2 handoff procedure Serving cell A of base station 1, UE place at current UE; Because the overweight suggestion of uplink load UE switches to the Serving cell B of base station 2, if switch reasons is merely traffic overload, because the synchronous life period of overload messages is poor; Then target BS can't know that up overload still is descending overload, might exist following situation, promptly; When switching the admittance flow process, Serving cell B also is in the state of up overload this moment, in fact can directly exclude this moment; So just can shorten switching time, improve switching efficiency, and to make things convenient for Serving cell B be that UE selects more suitable switching target.Obviously, from the demand of test maintaining,, more specifically just deal with problems beyond doubt with regard to Vietnamese side for the traffic overload reason.

For achieving the above object, the present invention provides following method: for the switching that causes owing to overload, in X2 handoff request message; In switch reasons, carry the overload reason; Particularly, on direction, up overload can be arranged, descending overload; General overload (perhaps being called light overload) can be arranged, heavily overload from the overload degree.This causality classification can independently use also can make up use (will be described in detail hereinafter).

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.

Method embodiment

Fig. 1 is the flow chart according to the method for indicating switch reasons of the embodiment of the invention, and Fig. 2 is the Signalling exchange flow chart that method shown in Figure 1 is shown.As shown in Figure 1, comprise following processing:

Step S102; The Serving cell A overload of current UE base station 1, place (source base station); And selecting switching target is the Serving cell B of base station 2 (target BS), and X2 handoff request message is sent to base station 2 in base station 1, and in X2 handoff request message, carries switch reasons information; (201 in the corresponding diagram 2, HANDOVER REQUEST)

Step S104, admission processing is switched according to the switch reasons information in the X2 handoff request message in base station 2; (202 in the corresponding diagram 2 analyzed the overload switch reasons, carries out handled)

Particularly, in step S102, switch reasons information specifically comprises following any and combination: overload directional information, overload degree information; Wherein, the overload directional information be following any: up overload, descending overload, in addition; For the overload degree information, overload degree thresholding can be set in advance, and according to overload degree threshold setting overload degree information; For example, the overload degree information comprise following any: general overload, heavy overload.

In the above-mentioned X2 handoff request message structure, the concrete reason in switch reasons not only can be up overload, descending overload; General overload is heavily transshipped, in practical application; This causality classification both can independently use also can make up use, and the situation for combination is used can have: up general overload; Up heavy overload, descending general overload, descending heavy overload etc.

Certainly, according to actual needs, for the overload degree information other division or expression mode can also be arranged, the present invention is not limited in this respect.

Preferably; After admission processing is switched according to switch reasons information in base station 2 in step S104; If switch decision is handled successfully, then base station 2 is to base station 1 feedback handoff request acknowledgment message, and if in the feedback handoff request acknowledgment message, carry and admit the failure business information; Then similarly, admitting the failure business information is following any or its combination: overload directional information, overload degree information.(203 in the corresponding diagram 2, HANDOVERPREPARATION FALUER)

Preferably; After admission processing is switched according to switch reasons information in base station 2 in step S104; Fail if switch decision is handled, then the preparation failed message is switched to base station 1 feedback in base station 2, and in switching the preparation failed message, carries to switch and prepare failure information; Similarly, switch preparing failure information also be following any or its combination: overload directional information, the degree information of transshipping.(204 in the corresponding diagram 2, HANDOVER REQUESTACKKNOWLEDGEMEN)

Below will further the technical scheme that the embodiment of the invention provides be described through instance.

Instance one: transship former because up overload or descending overload

The Serving cell A overload of base station 1, UE place; And; Selecting switching target is the Serving cell B of base station 2, and X2 handoff request message is sent to base station 2 in base station 1, and in X2 handoff request message, carries switch reasons information; As shown in table 2, the traffic overload cause information is: up overload or descending overload.

Base station 2 is according to switch reasons information; The Serving cell A that can know base station 1 is up overload or descending overload; Serving cell B also is under up overload or the descending overload situations this moment, can directly exclude, thereby can shorten switching time; Improve switching efficiency, and to make things convenient for Serving cell B be that UE selects more suitable switching target.

Table 2

The cell title	There is situation	IE type and reference information
			Select the reason group	M
-＞wireless network layer
			-＞＞wireless network layer reason	M	Enumeration type (Unspecified, normal switching, the normal switching that the wireless quality difference causes, load balancing, up overload, descending overload ...)
-＞transport layer	M
				M
	M

Instance two: transship former because generally overload or heavily overload

The Serving cell A overload of base station 1, UE place; And; Selecting switching target is the Serving cell B of base station 2, and X2 handoff request message is sent to base station 2 in base station 1, and in X2 handoff request message, carries switch reasons information; As shown in table 3, current traffic overload cause information is: generally overload or heavily overload.

Base station 2 can know that according to switch reasons information the overload situations of the Serving cell A of base station 1 transships or heavily transships for general, and whether Serving cell B can select to admit this moment according to the overload situations of self; The overload if Serving cell A attaches most importance to; And Serving cell B self also is in heavy overload, then can directly exclude, thereby can shorten switching time; Improve switching efficiency, and to make things convenient for Serving cell B be that UE selects more suitable switching target.

Table 3

The cell title	There is situation	IE type and reference information
			Select the reason group	M
-＞wireless network layer
			-＞＞wireless network layer reason	M	Enumeration type (the normal switchable load that the wireless quality difference causes is balanced for Unspecified, the normal switching, general overload, heavily overload ...)
-＞transport layer	M
			-＞agreement	M
-＞mix	M

Instance three: transship former because up general overload, descending general overload, up heavy overload or descending heavy overload

The Serving cell A overload of base station 1, UE place; And; Selecting switching target is the Serving cell B of base station 2, and X2 handoff request message is sent to base station 2 in base station 1, and in X2 handoff request message, carries switch reasons information; As shown in table 4, current traffic overload cause information is combined as: up general overload, descending general overload, up heavy overload or descending heavy overload.

Base station 2 is according to switch reasons information, and the Serving cell A that can know base station 1 is up general overload, descending general overload, up heavy overload or descending heavy overload, and whether Serving cell B can select to admit this moment according to the overload situations of self; If Serving cell A is up heavy overload, and Serving cell B also is up heavy overload, then can directly exclude; If Serving cell B is descending general overload; Then can carry out admission processing, can find out through above description, processing can be shortened switching time like this; Improve switching efficiency, and to make things convenient for Serving cell B be that UE selects more suitable switching target.

Table 4

The cell title	There is situation	IE type and reference information
			Select the reason group	M
-＞wireless network layer
			-＞＞wireless network layer reason	?M	Enumeration type (Unspecified, normal switching, the normal switching that the wireless quality difference causes, load balancing, up general overload, descending general overload, up heavy overload, descending heavy overload ...)
-＞transport layer	M
			-＞agreement	M
-＞mix	M

As stated, by means of above-mentioned at least one technical scheme of the present invention, through a kind of method for indicating switch reasons is provided; Make in the LTE system under the X2 switch instances; Make full use of the switch reasons information of carrying in the handoff request, strengthen the traffic overload reason and specifically describe, load balancing feedback information accurately can be provided; Make target BS switch and admit management more rationally effectively, thereby can improve switching efficiency and fault location and solution efficient.In addition, the present invention has broad applicability for the scene that the X2 that causes because of overload switches.

The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. method for indicating switch reasons is used at portable terminal owing to the overload reason causes and need switch to from source base station under the situation of target BS, indicates the overload switch reasons of said portable terminal to said target BS, it is characterized in that, comprising:

Said source base station sends X2 handoff request message to said target BS, and in said X2 handoff request message, carries switch reasons information, and said switch reasons information comprises following any and combination thereof: overload directional information, overload degree information;

Said target BS switches admission processing according to the switch reasons information in the said X2 handoff request message.

2. method according to claim 1 is characterized in that, said overload directional information be following any: up overload, descending overload.

3. method according to claim 1 is characterized in that, overload degree thresholding is set in advance, and according to the overload messages of said portable terminal and overload degree threshold setting overload degree information.

4. method according to claim 3 is characterized in that, said overload degree information comprise following any: light overload, heavy overload.

5. according to each described method in the claim 1 to 4, it is characterized in that, further comprise:

Said target BS is to said source base station feedback handoff request acknowledgment message; In said feedback handoff request acknowledgment message, carry under the situation of admitting the failure business information, said admittance failure business information is following any or its combination: said overload directional information, said overload degree information.

6. according to each described method in the claim 1 to 4, it is characterized in that, further comprise:

Said target BS switches to said source base station feedback prepares failed message; And prepare to carry in the failed message to switch in said switching and prepare failure information, it is following any or its combination that failure information is prepared in said switching: said overload directional information, said overload degree information.