CN102958125A - Transferring method among different RNCs (Radio Network Controller) in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system - Google Patents

Transferring method among different RNCs (Radio Network Controller) in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system Download PDF

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CN102958125A
CN102958125A CN2011102539450A CN201110253945A CN102958125A CN 102958125 A CN102958125 A CN 102958125A CN 2011102539450 A CN2011102539450 A CN 2011102539450A CN 201110253945 A CN201110253945 A CN 201110253945A CN 102958125 A CN102958125 A CN 102958125A
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cell
working frequency
request
frequency points
rnc
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曹振国
巢余红
佟梅娟
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TD Tech Ltd
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TD Tech Ltd
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Abstract

The invention provides a transferring method among different RNCs (Radio Network Controller) in a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system. The transferring method is characterized in that a source RNC of UE (User Equipment) transmits a transferring request to a target RNC, and working frequency point information of the UE in a source cell of the source RNC is carried in the request; and the target RNC receives the transferring request, and when the UE is used for distributing the resources, carrier wave resources which are different from a working frequency point carried in the transferring request are distributed. According to the transferring method, the transferring success rate can be increased.

Description

Moving method in a kind of TD-SCDMA system between different RNCs
Technical field
The present invention relates to the technology in the TD-SCDMA system, particularly the moving method between different RNCs in a kind of TD-SCDMA system.
Background technology
Migration is to switch to another RNC for the user who is in connected state with from a RNC in the TD-SCDMA system.Concrete existing migration flow process mainly comprises following steps as shown in Figure 1:
Step 101, source RNC initiates migration request to Target RNC;
Migration request message comprises the UE ability, the business information that UE is current, the current measuring control information of UE, the wireless link information that UE is current, and target cell information.
After step 102, Target RNC are received the migration request that transmits by CN, be the UE Resources allocation according to message content.
Step 103, after resource had assigned, Target RNC returned to source RNC by the migration request response message with deploy content.
Step 104, source RNC issues UE by physical channel reprovision or the order of RB reprovision with the content that Target RNC distributes.
Step 105, UE finishes migration according to the order of receiving.
Step 106, after UE finished migration, source RNC discharged local resource.
The particular content of above-mentioned relevant migration flow process please refer to the message effect that flow process that 3GPP TS 25.304 describes and 3GPP TS 25.413 describe.
Generally adopt multi-carrier district in the TDSCDMA system, characteristics are to have a carrier wave to be used for carrying PCCPCH and other common signal channels in the residential quarter, and it is called main carrier, and the carrier resource of a lot of different frequent points is arranged, and does not carry the PCCPCH channel, and it is auxiliary carrier wave.Main carrier provides service with auxiliary carrier wave for the user in this cell coverage area.The residing carrier wave of resource of distributing to UE is called the working frequency points of this UE.
In above-mentioned migration flow process, in the step 102 in the process of Target RNC Resources allocation after receiving migration request, content that can reference mainly be the migration request sent from source RNC with content, wherein, do not comprise that UE is in the working frequency points information of the cell-of-origin of source RNC.Therefore, present migration flow process may move to UE (namely with frequently switching) on the working frequency points identical with the cell-of-origin of source RNC, also UE may be moved to (being that alien frequencies switches) on the working frequency points different from the cell-of-origin of source RNC.
And generally, to be lower than the success rate that alien frequencies switches with the success rate of frequently switching.Particularly, as shown in table 1, provided the interior relativity with frequency handover success rate and alien frequencies handover success rate of RNC in certain city a period of time.
Switch number of attempt The handover success number of times Handover success rate
With frequently switching 1838 1804 0.9815
Alien frequencies switches 30092 29678 0.9862
Add up to 31930 31482 0.9859
Table 1
More as can be known, be lower than the alien frequencies handover success rate with handover success rate frequently in the TDSCDMA system by the success rate of switching with the success rate of frequently switching and alien frequencies in the table 1, approximately hang down 0.0047.Wherein, for switching in the RNC, adopted the algorithm of avoiding with the frequency switching, simultaneously, in the time can't realizing that alien frequencies switches, also allowed to carry out alien frequencies and switch.Therefore, in the statistics shown in the table 1, with frequently switching total degree much smaller than the alien frequencies switching times, still because with switching times is abundant frequently, its statistics remains significant.Simultaneously, adopted the algorithm of avoiding with the frequency switching just because of switching in the RNC, same frequently switching times is much smaller than the alien frequencies switching times, so handover success rate trends towards the alien frequencies handover success rate in the RNC.
Within the time identical with table 1, also carried out gathering as shown in table 2 to the migration index between different RNCs.
Number of attempt Number of success Success rate
Migrate into 4078 3688 0.9043
Move out 3842 3713 0.9664
Add up to 7920 7401 0.9334
Table 2
As shown in table 2, migration success rate between different RNCs is lower than handover success rate in the RNC at present, except the migration flow process than due to the reason of switching flow complexity, one of them major reason is exactly that the migration that has now between RNC can't effectively be avoided with frequently switching, thereby so that the migration success rate between different RNCs is lower.
Summary of the invention
The invention provides the moving method between a kind of different RNCs, can improve migration success rate.
For achieving the above object, the present invention adopts following technical scheme:
Moving method in a kind of TD-SCDMA system between different RNCs comprises:
The source RNC of UE sends migration request to Target RNC, and carries described UE in the working frequency points information of the cell-of-origin of source RNC in this request;
Described Target RNC receives described migration request, during for described UE Resources allocation, distributes the carrier resource different from entrained working frequency points in the described migration request.
Preferably, the described working frequency points information of described UE in the cell-of-origin of source RNC of carrying in this request is:
In the RRC of described migration request migration container, increase a cell, be used for carrying described working frequency points information.
Preferably, in the cell that increases, utilize UARFCN to represent described working frequency points information.
Preferably, described working frequency points information is that described UE is in many receipts of the cell-of-origin of source RNC multiple frequency number and each working frequency points.
Preferably, the described working frequency points information of described UE in the cell-of-origin of source RNC of carrying in this request is:
In the RRC of described migration request migration container, increase a cell, be used for carrying described frequency number, and carry described each working frequency points according to predefined order.
Preferably, each in described each working frequency points utilizes UARFCN to represent.
Preferably, described predefined order is: the carrier wave of preferentially avoiding distributing to UE in Target RNC is arranged in front;
The described distribution carrier resource different from entrained working frequency points in the described migration request is: according to putting in order of described each working frequency points, preferentially avoid successively the carrier resource that is arranged in front is distributed to UE.
Preferably, the carrier wave of carrier signaling transmission is arranged in front, after the carrier wave of carrier signaling transmission is not arranged in.
Preferably, the described working frequency points information of described UE in the cell-of-origin of source RNC of carrying in this request is:
In described migration request, carry described UE at the frequency number of the cell-of-origin of source RNC, and carry described UE at dominant frequency point and the auxiliary frequency of the cell-of-origin of source RNC according to predefined order;
The described distribution carrier resource different from entrained working frequency points in the described migration request is: described Target RNC be preferably described UE distribute with described migration request in entrained dominant frequency point and auxiliary frequency different carrier resource all.
Preferably, describedly in this request, carry dominant frequency point and the auxiliary frequency of described UE in the cell-of-origin of source RNC according to predefined order and be:
In the RRC of described migration request migration container, increase a cell, be used for carrying described dominant frequency point and auxiliary frequency.
Preferably, utilize UARFCN to represent dominant frequency point and auxiliary frequency.
Preferably, described predefined order is: dominant frequency point is front, and auxiliary frequency is rear.
As seen from the above technical solution, among the present invention, when the migration of carrying out between different RNCs, source RNC carries UE in the frequency point information of the cell-of-origin of source RNC in the migration request of initiating to Target RNC, when Target RNC is the UE distributing carrier wave according to the working frequency points information in the migration request, avoid with frequently switching, thereby improve migration success rate.
Description of drawings
Fig. 1 is the schematic flow sheet of existing moving method;
Fig. 2 is the moving method schematic flow sheet in the embodiment of the invention one;
Fig. 3 is the moving method schematic flow sheet in the embodiment of the invention two;
Fig. 4 is the moving method schematic flow sheet in the embodiment of the invention three.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is described in further details.
Basic thought of the present invention is: in the migration flow process between different RNCs, adopt the mode of avoiding with the frequency switching, thereby improve migration success rate.
In the moving method that background technology provides, in the transition process, Target RNC can't obtain UE in the frequency point information of the cell-of-origin of source RNC, therefore, can't effectively avoid with frequently switching.
Among the present invention, in the migration flow process, issue the migration request of Target RNC by source RNC, carry UE in the frequency point information of cell-of-origin, thereby after making Target RNC obtain corresponding frequency point information, taking to avoid the mode with frequently switching is UE distributing carrier wave resource.
Particularly, when in the migration request order, carrying working frequency points information, for the single carrier user, can only carry UE in the working frequency points information of the cell-of-origin of source RNC; For the multicarrier user, can carry UE in all working frequency point information of the cell-of-origin of source RNC.Except only carrying working frequency points information, can also in the migration request order, carry UE in dominant frequency point and the auxiliary frequency point information of the cell-of-origin of source RNC, to realize larger isolation, improve handover success rate largelyr.The embodiment of above-mentioned three kinds of processing modes is described below by three specific embodiments.
Embodiment one:
In the present embodiment, for the single carrier user, in the migration request order, carry UE in the single working frequency points information of the cell-of-origin of source RNC.
Fig. 2 is the schematic flow sheet of moving method in the present embodiment.As shown in Figure 2, the method comprises:
Step 201, the source RNC of UE sends migration request to Target RNC, and carries UE in the single working frequency points information of the cell-of-origin of source RNC in this request.
Wherein, the concrete mode of carrying single working frequency points information in migration request can be in the RRC of migration request migration container newly-increased cell, carries this single working frequency points.Concrete cell can adopt the definition shown in the table 3, wherein, utilizes UARFCN to represent working frequency points.
The cell title Span Remarks
UARFCN Integer(0..16383) UARFCN value and actual frequency corresponding relation can
With reference to agreement 3GPP TS25.102
Table 3
Step 202, Target RNC receives the migration request that transmits through CN, therefrom extracts working frequency points information, and is the UE distribution carrier resource different from the single frequency that carries.
Target RNC extracts working frequency points information in this step, is that UE is distributed in the carrier resource on the Target RNC according to this working frequency points.When the distributing carrier wave resource, the problem that need to consider during except the existing allocation of carriers of consideration, further be that UE distributes the carrier resource different from the single working frequency points of carrying, to avoid with frequently switching specifically.
Step 203, after resource had assigned, Target RNC returned to source RNC by the migration request response message with the resource of distributing.
Step 204, RNC issues UE by physical channel reprovision or the order of RB reprovision with the content that Target RNC distributes.
Step 205, UE finishes migration according to the order of receiving.
Step 206, after UE finished migration, source RNC discharged local resource.
Wherein, the processing of step 203～206 is identical with the processing of step 103～106 in the flow process shown in Figure 1, just repeats no more here.
So far, the method flow in the present embodiment finishes.
Embodiment two:
In the present embodiment, for the multicarrier user, in the migration request order, carry UE in each working frequency points information of the MIMO of the cell-of-origin of source RNC.
Fig. 3 is the schematic flow sheet of moving method in the present embodiment.As shown in Figure 3, the method comprises:
Step 301, the source RNC of UE sends migration request to Target RNC, and carries UE in the working frequency points information of the MIMO of the cell-of-origin of source RNC in this request.
Wherein, the concrete mode of carrying the working frequency points information of MIMO in migration request can be in the RRC of migration request migration container newly-increased cell, carry the frequency number of the MIMO of UE, and carry each working frequency points according to predefined order.Concrete cell can adopt the definition shown in the table 4, and wherein, each working frequency points all utilizes UARFCN to represent.
Figure BDA0000087321270000071
Table 4
Wherein, each working frequency points can preset putting in order of each working frequency points as required when carrying.Preferably, can set the carrier wave that in Target RNC, preferentially to avoid distributing to UE and be arranged in front, thereby make things convenient in order selection to avoid the carrier resource that distributes.For example, the carrier wave that carrier signaling is transmitted is arranged in front, after the carrier wave of carrier signaling transmission is not arranged in; Because the carrier wave of carrier signaling transmission is front, the allocation of carriers of usually preferentially avoiding carrier signaling is transmitted in Target RNC is to UE.Certainly, also can set according to actual needs and put in order.
Step 302, Target RNC receives the migration request that transmits through CN, therefrom extracts each working frequency points information, and is the UE distribution carrier resource different from the frequency point information of carrying.
Target RNC extracts working frequency points information in this step, is that UE is distributed in the carrier resource on the Target RNC according to this working frequency points.Specifically when the distributing carrier wave resource, the problem that need to consider when considering existing allocation of carriers, further for UE distributes and the equal different carrier resource of each working frequency points of carrying, to avoid with the frequency switching.If can't avoid all different from each working frequency points, if then each working frequency points put in order for: the carrier wave that will preferentially avoid distributing to UE in Target RNC is arranged in front, so just can according to the putting in order of each working frequency points, preferentially avoid successively the carrier resource that is arranged in front is distributed to UE.
Step 303, after resource had assigned, Target RNC returned to source RNC by the migration request response message with the resource of distributing.
Step 304, RNC issues UE by physical channel reprovision or the order of RB reprovision with the content that Target RNC distributes.
Step 305, UE finishes migration according to the order of receiving.
Step 306, after UE finished migration, source RNC discharged local resource.
Wherein, the processing of step 303～306 is identical with the processing of step 103～106 in the flow process shown in Figure 1, just repeats no more here.
So far, the method flow in the present embodiment finishes.
Embodiment three:
In the present embodiment, in the migration request order, carry UE in dominant frequency point and the auxiliary frequency point information of the cell-of-origin of source RNC, to realize larger isolation.
Fig. 4 is the schematic flow sheet of moving method in the present embodiment.As shown in Figure 4, the method comprises:
Step 401, the source RNC of UE sends migration request to Target RNC, and carries UE in the dominant frequency point of source RNC, auxiliary frequency point information in this request.
Wherein, the concrete mode of carrying dominant frequency point, auxiliary frequency in migration request can be in the RRC of migration request migration container newly-increased cell, carry the frequency number of the cell-of-origin of UE source RNC, and carry dominant frequency point and the auxiliary frequency of cell-of-origin according to predefined order.Concrete cell can adopt the definition shown in the table 5, and wherein, each working frequency points all utilizes UARFCN to represent.
Figure BDA0000087321270000081
Table 5
Wherein, dominant frequency point and auxiliary frequency can preset putting in order of each frequency as required when carrying.For example, can set the dominant frequency point is arranged in front, after auxiliary frequency is arranged in.Certainly, also can set according to actual needs and put in order.For example, can be according to the large minispread of UARFCN value, according to attribute or the interference level of carrier wave or the arrangements such as load level of carrier wave of carrier wave.
Step 402, Target RNC receives the migration request that transmits through CN, therefrom extracts frequency point information, and is the UE distribution carrier resource different from the frequency that carries.
Target RNC extracts frequency number, dominant frequency point and auxiliary frequency point information in this step, is that UE is distributed in the carrier resource on the Target RNC according to this frequency.Specifically when the distributing carrier wave resource, the problem that need to consider when considering existing allocation of carriers, further for UE distributes and the equal different carrier resource of each frequency that carries, to avoid with the frequency switching.
Step 403, after resource had assigned, Target RNC returned to source RNC by the migration request response message with the resource of distributing.
Step 404, RNC issues UE by physical channel reprovision or the order of RB reprovision with the content that Target RNC distributes.
Step 405, UE finishes migration according to the order of receiving.
Step 406, after UE finished migration, source RNC discharged local resource.
Wherein, the processing of step 403～406 is identical with the processing of step 103～106 in the flow process shown in Figure 1, just repeats no more here.
So far, the method flow in the present embodiment finishes.In the present embodiment, what Target RNC obtained is the frequency point information of RNC cell-of-origin, source, avoids identical with all frequencies of cell-of-origin for the carrier wave that UE distributes, and like this, can provide better isolation, improves to a greater degree migration success rate.
The above-mentioned specific implementation that is among the present invention.As seen by above-mentioned, the present invention is when realizing, Target RNC can obtain the frequency point information of cell-of-origin, thereby can effectively avoid with frequently switching.Switch the success rate switched with alien frequencies relatively according to the same frequency that provides in the background technology again and to the analysis of existing moving method success rate as seen, avoid the moving method that switches with frequently among the present invention, can be by avoiding improving migration success rate with frequently switching.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (12)

1. the moving method between different RNCs in the TD-SCDMA system is characterized in that, the method comprises:
The source RNC of UE sends migration request to Target RNC, and carries described UE in the working frequency points information of the cell-of-origin of source RNC in this request;
Described Target RNC receives described migration request, during for described UE Resources allocation, distributes the carrier resource different from entrained working frequency points in the described migration request.
2. method according to claim 1 is characterized in that, the described working frequency points information of described UE in the cell-of-origin of source RNC of carrying in this request is:
In the RRC of described migration request migration container, increase a cell, be used for carrying described working frequency points information.
3. method according to claim 2 is characterized in that, in the cell that increases, utilizes UARFCN to represent described working frequency points information.
4. method according to claim 1 is characterized in that, described working frequency points information is that described UE is in many receipts of the cell-of-origin of source RNC multiple frequency number and each working frequency points.
5. method according to claim 4 is characterized in that, the described working frequency points information of described UE in the cell-of-origin of source RNC of carrying in this request is:
In the RRC of described migration request migration container, increase a cell, be used for carrying described frequency number, and carry described each working frequency points according to predefined order.
6. method according to claim 5 is characterized in that, each in described each working frequency points utilizes UARFCN to represent.
7. method according to claim 4 is characterized in that, described predefined order is: the carrier wave of preferentially avoiding distributing to UE in Target RNC is arranged in front;
The described distribution carrier resource different from entrained working frequency points in the described migration request is: according to putting in order of described each working frequency points, preferentially avoid successively the carrier resource that is arranged in front is distributed to UE.
8. side according to claim 7 is characterized in that, the carrier wave of carrier signaling transmission is arranged in front, after the carrier wave of carrier signaling transmission is not arranged in.
9. method according to claim 1 is characterized in that, the described working frequency points information of described UE in the cell-of-origin of source RNC of carrying in this request is:
In described migration request, carry described UE at the frequency number of the cell-of-origin of source RNC, and carry described UE at dominant frequency point and the auxiliary frequency of the cell-of-origin of source RNC according to predefined order;
The described distribution carrier resource different from entrained working frequency points in the described migration request is: described Target RNC be preferably described UE distribute with described migration request in entrained dominant frequency point and auxiliary frequency different carrier resource all.
10. method according to claim 9 is characterized in that, describedly carries dominant frequency point and the auxiliary frequency of described UE in the cell-of-origin of source RNC according to predefined order be in this request:
In the RRC of described migration request migration container, increase a cell, be used for carrying described dominant frequency point and auxiliary frequency.
11. method according to claim 9 is characterized in that, utilizes UARFCN to represent dominant frequency point and auxiliary frequency.
12. method according to claim 9 is characterized in that, described predefined order is: dominant frequency point is front, and auxiliary frequency is rear.
CN2011102539450A 2011-08-30 2011-08-30 Transferring method among different RNCs (Radio Network Controller) in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system Pending CN102958125A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN101860931A (en) * 2009-04-09 2010-10-13 大唐移动通信设备有限公司 Cell switching method and system for multi-carrier aggregation system
CN101998556A (en) * 2009-08-11 2011-03-30 中兴通讯股份有限公司 Method and system for switching user equipment to carrier aggregation subdistrict
WO2011085682A1 (en) * 2010-01-14 2011-07-21 中兴通讯股份有限公司 Method and system for updating air interface keys

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101616450A (en) * 2008-06-24 2009-12-30 上海华为技术有限公司 The method that a kind of multicarrier empty port is reshuffled, Apparatus and system
CN101860931A (en) * 2009-04-09 2010-10-13 大唐移动通信设备有限公司 Cell switching method and system for multi-carrier aggregation system
CN101998556A (en) * 2009-08-11 2011-03-30 中兴通讯股份有限公司 Method and system for switching user equipment to carrier aggregation subdistrict
WO2011085682A1 (en) * 2010-01-14 2011-07-21 中兴通讯股份有限公司 Method and system for updating air interface keys

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Application publication date: 20130306